The present invention relates to acid gas removal unit and an acid gas removal process for removing acid gas containing the acid gases in the gas.
BACKGROUND
[0002]
　For example coal and biomass such as CO contained in the gasified gasification gas in the gasification furnace 2 and H 2 S, H 2 as a technique for removing acid gases such as S, conventionally, chemical with amine absorbent such as absorption method has been used. The chemical absorption method, an amine-based absorbent and absorbing solution, CO in the gas in the absorption tower 2 and the rich solution by absorbing, the absorbed CO 2 by introducing the rich solution containing the regenerator, such as reboiler CO by the heat source 2 by dissipating, CO from the absorption liquid 2 and lean solution obtained by removing, introduced by circulating recycled acidic art gas removal apparatus has been proposed (e.g. Patent to re absorption tower the lean solution references 1).
[0003]
　NH in the gas 3 , H 2 S, if included corrosion causative agent of HCN or the like, absorbed in the absorbing solution in the absorption tower the example NH 3 , H 2 S, the component of HCN, etc. are discharged from the regeneration tower since accumulate condensed water generated during the cooling of that outlet gases cause corrosion of exposed overhead condenser or the like device material in the condensed water containing the impurities, there is a problem that.
[0004]
　Further, CO in absorption tower 2 together with, for example, NH 3 rich solution that has absorbed is supplied to the regenerator, CO by heating the rich solution supplied to the regenerator 2 and NH 3 to dissipate and, regenerator outlet gas NH dissipated contained in 3 is reabsorbed in the condensed water generated by the cooling of the cooling device in the top of the regeneration column. As a result, when introducing the condensed water to the regenerator, NH 3 flows down the rich solution containing, regeneration tower falling again liquid NH 3 is Kaee repeated cycles of dissipating, there is a problem that.
[0005]
　In addition to the above cycle, the absorption tower NH example 3 NH untreated gas to be introduced constantly continuously lean solution dissipating 3 because is newly absorbed, NH 3 continuously from the rich solution is supplied to the regeneration tower, NH to the regenerator in the condensed water 3 there is a problem that accumulation and concentrated.
[0006]
　In response to this corrosion, 1) a method of purging the condensed water, 2) NH by water washing or the like in the absorption tower upstream 3 method pretreatment removal, 3) regenerator upstream or condensation of moisture in the regeneration tower outlet gas a method of adding a corrosion inhibitor to, 4) NH from condensed water 3 stripping method, 5) various countermeasures methods employing a corrosion resistant material have been made.
CITATION
Patent Document
[0007]
Patent Document 1: JP 2014-161758 JP
Summary of the Invention
Problems that the Invention is to Solve
[0008]
　However, NH 3 in the purging method of the condensed water containing, the condensed water for also includes absorbent component such as an amine, the absorption liquid cost increases, there is a problem that. Furthermore, it is necessary to properly process the waste water containing amine such harmful substances, the cost is required for the processing measures, there is a problem that.
[0009]
　NH in the upstream of the absorption tower (previous step) 3 removal or, NH from condensed water 3 issues in order to perform the stripping, it is necessary to separately install additional equipment, and increase of equipment cost, that there is.
[0010]
　Also required is an inhibitor costs for measures to use a corrosion inhibitor, there is a problem that.
[0011]
　Within regenerator, NH brought by rich solution 3 for retention while repeating evaporation and condensation of, NH concentrated in the condensed water 3 heat input required to vaporize the increases, there is a problem that.
[0012]
　In view of the above problems, for example, NH in the gas 3 , H 2 S, if it contains corrosive substances causing HCN, etc., acid gas removal, which is possible to reduce the corrosion-causing substances condensed water in the regeneration tower to provide an apparatus and acid gas removal process to an object.
Means for Solving the Problems
[0013]
　The first aspect of the present invention to solve the above problems, corrosion-causing substances, acid gas absorbing portion by contacting the acid gas in the gas containing acid gases and the acid gas absorbing liquid to remove acid gases and acid gas absorption tower with an absorption liquid regenerator to regenerate the rich solution that has absorbed acid gas by the steam reboiler, the withdrawing the rich solution from the acid gas absorption tower, the top of the absorbing solution regeneration tower a rich solution supply line to be introduced into the rich solution introducing portion side, the lean solution regenerated acid gas is dissipated in the absorbing solution regeneration tower with withdrawing from the bottom of the absorbing solution regeneration tower, the acid gas absorption It was introduced into the column, the lean-solution supply line for reuse as the acid gas absorbing fluid, rich lean solution heat exchange which is provided at the intersection between said rich solution supply line the lean-solution supply line And vessels, corrosion-causing substances emitted from the top of the regeneration tower, the carrier gas entraining the acid gases, anda regeneration tower condenser unit for condensing water, the regenerator condenser section, the carrier gas and a gas discharge line for discharging from the top of the regeneration tower, the gas-liquid separator for separating a cooler interposed in the discharge line, and a regeneration tower condensed water and acid gas steam is condensed by the condenser When the reflux line for recirculating the regeneration tower condensed water in the condensed water introducing portion of the rich solution introduction part top portion than the condensed water receiving portion for storing the regeneration tower condensed water introduced by the return line, the extracted the regenerator condensed water from the condenser drainage and out of the condensed water receiving portion, an acidic gas removing apparatus characterized by comprising a first condenser draining unloading line to be connected to the lean-solution supply line .
[0014]
　The second aspect, in the first aspect, instead of withdrawal of the regeneration tower condensed water by the first condensing draining unloading lines, a portion of the front of the regenerator condensed water introduced into the condensed water inlet portion withdrawal, in acid gas removal apparatus characterized by comprising a second condensing draining unloading line to be connected to the lean-solution supply line.
[0015]
　The third invention is the invention of the first or second, the acidic gas absorption tower gas flow downstream side of the acid gas absorbing unit, the cleaning unit for cleaning acid gases by washing water circulating is removed gas wherein the wash water is in the acid gas removal apparatus characterized by merging some or all of the regeneration tower condensed water.
[0016]
　A fourth invention is corrosion-causing substances, and acid gas absorption tower having an acid gas absorbing unit for removing acid gases by contacting the acid gas in the gas containing acid gases and the acid gas absorbing fluid, the acid gas absorbed and absorbent regenerator for regeneration by steam reboiler rich solution, the acid with a gas absorption tower extracting the rich solution, the rich solution supply for introducing the rich solution introducing portion of the top side of the absorbent regenerator line and the lean solution regenerated acid gas is dissipated in the absorbing solution regeneration tower with withdrawing from the bottom of the absorbing solution regeneration tower is introduced into the acid gas absorption tower and reused as an acid gas absorbing liquid the lean-solution supply line, and the rich-lean solution heat exchanger provided in the intersections of the rich solution supply line and the lean-solution supply line, rot and is discharged from the top of the regeneration tower Causative agent, the carrier gas to entrain the acid gases, anda regeneration tower condenser unit for condensing water, the regenerator condenser unit is provided on the top portion than the rich solution introducing portion of the regeneration tower, the carrier gas is cooled by the cooling water within said regenerator, and concentrated portion by gas-liquid separation to separate the regeneration tower condensed water and acid gases and condensed water receiving portion for storing the regenerator condensed water, extracting the regenerator condensed water of the condensed water receiving portion, wherein a circulation line for circulating the regeneration tower reflux water circulating pump on the top side of, is interposed in said circulation line, the cooling water to cool the regenerator condensed water a cooler to, from the condensation drainage unloading portion of the condensed water receiving unit, or from between the cooler and a reflux water circulating pump of the circulation line, extracting the regenerator condensed water, is connected to the lean-solution supply line third of the condensed water drain and out line , In acid gas removal apparatus characterized by comprising a.
[0017]
　A fifth aspect of the invention is first in the fourth invention, instead of withdrawal of the regeneration tower condensed water by the third condensing draining unloading lines, a portion of the cooling water is connected to the lean-solution supply line 4 there in that it comprises a condensation drainage unloading line acid gas removal apparatus characterized.
[0018]
　A sixth invention is corrosion-causing substances, a gas containing acid gases is introduced into acid gas absorption tower, the acid gas absorption process for removing acid gases and acid gas absorbing liquid and the contact is allowed to acid gas in the gas When the rich solution that has absorbed acid gases is introduced into the absorbent regenerator, and absorbing solution regeneration step of regenerating the acid gas by reboiler steam, the acid gas absorbing liquid and the acid gas absorption tower and the absorbent regenerator in step a, absorbent solution regeneration step of circulating reused by circulation line, corrosion-causing substances, wherein separated by absorbent regenerator external, from carrier gas entraining said acid gas, regenerator condensation step of condensing the moisture When a step of water vapor by cooling the entrained gas to separate the condensed regeneration tower condensed water and acid gases, the regenerator condensed water, from the position where the rich solution of the absorbing solution regeneration tower is introduced also tower A reflux step of storing at reflux in parts side, withdrawn reflux has been the regeneration tower condensed water, merging step of merging the said regenerator condensed water containing lean solution and the corrosion-causing substances circulating in the acid gas absorption tower If, in acid gas removal method characterized by having a.
[0019]
　A seventh invention is corrosion-causing substances, a gas containing acid gases is introduced into acid gas absorption tower, the acid gas absorption process for removing acid gases and acid gas absorbing liquid and brought into contact with and acid gas in the gas When the rich solution that has absorbed acid gases is introduced into the absorbent regenerator, and absorbing solution regeneration step of regenerating the acid gas by reboiler steam, circulates the acid gas absorbing liquid with acid gas absorption tower and absorbent regenerator line a step of circulating reused by, the absorbent solution regeneration step, at the top portion side of a position where the rich solution of the interior of the regenerator is introduced, accompanied corrosion causing substances accompanied by water vapor, acid gases are entrained a regenerator condensation step of condensing water from a gas, within said regenerator, a step of water vapor by cooling the entrained gas to separate the regeneration tower condensed water is condensed and acid gas, the regenerator condensed water disconnect the external And, cooled to the cooling water, which joins a reflux step of refluxing from the top side of the regenerator, extracting the regenerator condensed water, and a condensed water containing the lean solution and the corrosion-causing substances circulating in the absorption tower in acid gas removal method characterized by comprising the steps, a.
[0020]
　Advantageously, in the invention of the sixth or seventh, the gas flow downstream side of the acid gas absorption tower acid gas absorbing unit, a cleaning step of cleaning the gas acid gas is removed by washing water circulating a, wherein the wash water is in the acid gas removal method characterized by merging some or all of the regeneration tower condensed water.
The invention's effect
[0021]
　According to the present invention, by mixing with the lean solution supplied to the acid gas absorption tower and the regeneration tower condensed water, by increasing the corrosion-causing substance concentration in the lean solution from the raw gas in the acid gas absorption tower of reducing the absorption of new corrosion-causing substance, by reducing the migration amount to regeneration tower condensate corrosion-causing substances in the raw gas, it is possible to suppress an increase in corrosion-causing substance concentration of the condensed water . As a result, it is possible to reduce the concentration of corrosion-causing substances regenerator condensate water can prevent corrosion of the members used in the overhead condenser of the regenerator.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022]
[1] Figure 1 is a schematic diagram of acid gas removal apparatus according to the first embodiment.
FIG. 2 is a schematic diagram of acid gas removal apparatus according to the second embodiment.
FIG. 3 is a schematic diagram of acid gas removal device according to the third embodiment.
[4] FIG. 4 is a schematic diagram of acid gas removal device according to the fourth embodiment.
FIG. 5 is a schematic diagram of another acid gas removing apparatus according to the fourth embodiment.
FIG. 6 is a schematic diagram of another acid gas removing apparatus according to the fourth embodiment.
DESCRIPTION OF THE INVENTION
[0023]
　With reference to the accompanying drawings, illustrating preferred embodiments of the present invention in detail. It is not intended the invention be limited by this example, also, if the embodiment there are a plurality, i.e., an constitute a combination of each embodiment.
Example 1
[0024]
　Figure 1 is a schematic diagram of acid gas removal apparatus according to the first embodiment. In this embodiment, as the acidic gas, carbon dioxide (CO 2 illustrate), the CO 2 CO as an absorbent that absorbs 2 using an absorbent, CO 2 in the absorption tower, CO from gas 2 was removed, CO 2 for example to play absorbing solution in the absorption solution regenerator is described, H 2 can be similarly applied to other acidic gases such as S.
[0025]
　As shown in FIG. 1, an acid gas removing apparatus 10A according to the present embodiment, CO 2 with, NH 3 introducing gas (hereinafter referred to as "gas") 11 containing is introduced, CO in the gas 2 and CO 2 absorbing liquid 12 and the contacting CO with 2 to remove CO 2 absorbing section (hereinafter "absorption unit" that) CO with a 13A 2 and absorption tower (hereinafter referred to as "absorption column") 13, CO 2 has absorbed CO 2 absorbing liquid rich solution 12A is a 12 CO by the steam reboiler 61 2 and reproduces the absorbing liquid absorbent regenerator (hereinafter "regenerator" hereinafter) 14, together with the withdrawing rich solution 12A from the absorption tower 13, reproduction the rich solution supply line 50 to be introduced into the column 14 side, CO reproduced by the regenerator 14 2 CO is dissipated 2 lean solution 12B with withdrawing from the regeneration tower 14 is an absorption liquid, is introduced into the absorption tower 13 , CO 2 as absorbing liquid It includes a lean-solution supply line 53 to be used. CO 2 absorbing liquid 12 CO 2 rich solution 12A and CO was absorbed 2 and lean solution 12B that dissipate, circulating reused in the acid gas removal unit.
[0026]
　CO using the acid gas removing apparatus 10A 2 in the recovery process, firstly, NH 3 , CO 2 gas 11 containing, in a cooling section (not shown), is cooled by the cooling water, it is sent to the absorption tower 13.
[0027]
　In the absorption tower 13, the gas 11 introduced by the gas introduction line 13c is CO aminic 2 CO containing absorbing component 2 by countercurrent contact with the absorption liquid 12, CO in the gas 11 2 is, CO by a chemical reaction 2 absorption It is absorbed by the liquid 12. CO absorption tower 13 2 CO after was removed 2 flue gas 11A, after the mist is collected by the demister 56 is then released from the top 13a to the outside of the system.
[0028]
　Moreover, CO 2 rich solution 12A which has absorbed is withdrawn by the rich-solution supply line 50 from the bottom 13b of absorption tower 13 is pressurized by the rich solution pump 51, the rich solution supply line 50 and the lean-solution supply line 53 in rich lean solution heat exchanger 52 provided at the intersection, it is heated by the lean solution 12B reproduced by the regeneration tower 14, is supplied to the regenerator 14.
[0029]
　Rich solution 12A from the vicinity of an upper portion of the rich solution introducing portion 14a is released inside the regeneration tower 14, caused the endothermic reaction by the steam by reboiler 61 supplied from the bottom, most of the CO 2 releasing. CO some or most in the regenerator 14 2 CO were released 2 absorbing solution is called semi-lean solvent. The semi-lean solution, the time to reach the bottom portion 14b of the regenerator 14, almost all of the CO 2 CO has been removed 2 becomes absorbing solution (lean solution) 12B. The lean solution 12B is a part is heated by the reboiler 61 to the saturated steam 62 is supplied, and supplies the steam to the internal regeneration tower 14.
[0030]
　On the other hand, from the top 14c of the regenerator 14, NH accompanied by water vapor released from the rich solution 12A and the semi-lean solution in the tower 3 , CO 2 carrier gas entraining (hereinafter referred to as "carrier gas") 41 demister mist is discharged after being collected in 56.
[0031]
　The carrier gas 41, the cooler 42 the steam is condensed by, regenerator condensed water in the gas-liquid separator 43 (hereinafter "condensed water" hereinafter) 44 and CO 2 gas 45 is separated, the separated CO 2 gas 45 may be, for example enhanced oil recovery method (EOR: Enhanced oil recovery) or pressed into oil was used to stored in an aquifer, thereby achieving the warming.
[0032]
　Also, regenerated CO 2 absorbing solution (lean solution) 12B is withdrawn by the lean-solution supply line 53 from the bottom 14b of the regenerator 14 at the rich-lean solution heat exchanger 52, it is cooled by the rich solution 12A is pressurized by a lean solution pump 54 then, after being cooled further by a lean solution cooler 55, it is supplied to the absorption tower 13. In the description of the acid gas removal apparatus of this embodiment, which only explaining the outline has been described with partial omission accompanying equipment.
[0033]
　In this embodiment, the carrier gas 41 discharged from the top portion 14c of the regenerator 14, the regenerator condenser 40 for condensing the moisture is provided outside of the regenerator 14.
　The regeneration column condenser 40, the discharge line 40a for discharging the carrier gas 41 from the top 14c of the regenerator 14, and cooler 42 interposed in the discharge line 40a, the water vapor is condensed by cooler 42 condenses water 44 and CO 2 gas-liquid separator 43 for separating the gas 45, the reflux line 40b for recirculating condensate 44 on the head side of the regenerator, and a reflux water circulation pump 46 interposed in reflux line 40b It is provided.
[0034]
　NH accompanied by steam 3 , entrained condensed water 44 is separated to reflux by the gas-liquid separator 43 from the gas 41, at reflux water circulation pump 46 of the top portion 14c side from the rich solution introducing portion 14a of the regeneration tower 14 is introduced from the condensed water introduction section 14d. Inside the condensed water introducing portion 14d of the regenerator, the condensed water receiving part 14e for receiving the condensed water is installed, and storing the condensed water 44 is introduced into the interior.
[0035]
　In this embodiment, the condensed water 44 from the condenser drainage unloading portion 14f of the condensed water receiving portion 14e of the regenerator 14 withdrawing, the first condenser draining unloading lines 14 g-1 to be connected to the lean-solution supply line 53 is provided . The first condensate draining unloading lines 14 g-1 off valve 14h is provided, and the adjustment of the extraction amount.
[0036]
　NH was withdrawn from the first condenser draining unloading lines 14 g-1 3 condensed water 44 containing, in the merging portion 14i of the lean-solution supply line 53, the lean solution 12B was withdrawn from the bottom portion 14b of the regenerator 14 mixed and supplied to the subsequent absorption tower 13.
[0037]
　As a result, by mixing with the lean solution 12B to be supplied to the absorption tower 13 and condensed water 44, NH corrosion causative agent of the lean solution 3 by increasing the concentration, new from untreated gas of the absorption tower 13 NH 3 to reduce the absorption of, NH in the raw gas 3 by reducing the migration amount to condensed water 44, NH in the condensed water 44 3 it is possible to suppress an increase in concentration.
[0038]
　As a result, NH is a corrosion-causing substance in the condensed water 44 3 reduced concentration of becomes possible, thereby preventing the corrosion of the members used in the top condenser of the regeneration tower 14.
[0039]
　The condensed water 44 without discharging out of the system, because they are mixed in the lean solution 12B which is circulated and supplied to the absorption tower 13, it is possible to prevent loss of the amine absorber component, a separate condensing containing harmful absorber component water treatment is not required.
[0040]
　Moreover, NH accumulate in the regeneration tower 14 3 is to reduce the amount, NH 3 can be reduced heat input required for the evaporation and condensation of (heat load in the bottom reboiler and overhead condenser).
[0041]
　Acid gas removal method according to the present embodiment, the corrosion-causing substances (NH 3 ), CO is an acidic gas 2 gas 11 containing introduced into absorption tower 13, CO in the gas 11 2 and CO 2 absorbing liquid 12 CO by contacting the door 2 CO removing 2 and absorption step, CO 2 introduced rich solution 12A to the regenerator 14 which has absorbed, CO by reboiler steam 2 and absorbing solution regeneration step of reproducing, CO 2 absorbing solution 12 and the absorption tower 13 and a step of circulating reused by circulation line and a regeneration tower 14, the absorbing solution regeneration step, at the outside of the regeneration tower 14, separated corrosion-causing substances (NH 3 ), CO 2 entrains from entrained gas 41, a regeneration tower condensation step of condensing the moisture, water vapor condensed water 44 and CO were condensed by cooling the carrier gas 41 2 and separating the gas 45, the condensed water 44, regenerator 14 rich solution 12A is of the introduction of the That a reflux step of storing at reflux rich solution introducing portion top portion 14c side than 14a, extracting the condensed water 44 reflux, the lean solution 12B circulating in the absorption tower 13 and condensed water 44 containing the corrosion-causing substances and a step of merging the.
[0042]
　According to the acid gas removal process, the lean solution 12B to be supplied to the absorption tower 13 by mixing the condensed water 44, NH corrosion-causing substances in the lean solution 12B 3 by increasing the concentration, only the absorption tower 13 new NH from the processing gas 3 to reduce the absorption of, NH in the raw gas 3 by reducing the migration amount to condensed water 44, NH in the condensed water 44 3 to suppress an increase in concentration can.
Example 2
[0043]
　Figure 2 is a schematic diagram of acid gas removal apparatus according to the second embodiment. Note that the configuration of the same configuration in Example 1, the description thereof duplicate the same reference numerals will be omitted. As shown in FIG. 2, acid gas removal device 10B according to this embodiment, in place of the extraction of the condensed water 44 according to the first condenser draining unloading lines 14 g-1 in Example 1, introduced into the condensed water inlet portion 14d second condensing draining unloading connecting to the lean-solution supply line 53 between the portion of the front of the condensed water 44 drawn from the branch portion 14k of the reflux line 40b, a rich lean solution heat exchanger 52 and absorption tower 13 to comprising a line 14g-2.
[0044]
　Incidentally, the branch portion 14k for branching the condensed water 44 may be between the gas-liquid separator 43 and reflux water circulation pump 46.
[0045]
　According to the acid gas removal process, the lean solution 12B to be supplied to the absorption tower 13 by mixing the condensed water 44, NH corrosion-causing substances in the lean solution 12B 3 by increasing the concentration, only the absorption tower 13 new NH from the processing gas 3 to reduce the absorption of, NH in the raw gas 3 by reducing the migration amount to condensed water 44, NH in the condensed water 44 3 to suppress an increase in concentration can.
Example 3
[0046]
　Figure 3 is a schematic diagram of acid gas removal device according to the third embodiment. Note that the configuration of the same configuration in Example 1, the description thereof duplicate the same reference numerals will be omitted. As shown in FIG. 3, acid gas removal device 10C according to the present embodiment, the absorption column 13 in Example 1, CO 2 in the gas stream downstream side of the absorbent portion 13A, CO by washing water 20a circulating 2 is and a cleaning unit 13B for cleaning the removed gas.
[0047]
　In this embodiment, CO is supplied from the nozzle in the cleaning unit 13B of the absorption tower 13 2 and cleaning water 20a for circulating an absorbent liquid and a gas are gas-liquid contact, CO 2 entrained in the gas is removed CO 2 absorbent is recovered by washing water 20a, it is then released from the top to the outside of the system. Reference numeral 20b is the cleaning water circulation line, 20c is cooler for cooling the washing water 20a, 20d circulation pump for circulating the washing water 20a, 20e of cleaning water reservoir for storing a cleaning liquid.
[0048]
　In this embodiment, the first condensing draining unloading lines 14 g-3 connected to the circulation line 20b of the washing water 20a, and so as to merge some or all of the condensed water 44.
[0049]
　According to the acid gas removal process, the mixing of the cleaning water 20a and the condensed water 44 circulating the cleaning portion 13B of the absorption column 13, NH corrosion-causing substances in the wash water to fall within the absorption tower 3 by increasing the concentration , new NH from untreated gas of the absorption tower 13 3 to reduce the absorption of, NH in the raw gas 3 by reducing the migration amount to condensed water 44, NH in the condensed water 44 3 it is possible to suppress an increase in concentration.
Example 4
[0050]
　Figure 4 is a schematic diagram of acid gas removal device according to the fourth embodiment. 5 and 6 are schematic views of other acidic gas removing apparatus according to the fourth embodiment. Note that the configuration of the same configuration in Example 1, the description thereof duplicate the same reference numerals will be omitted. As shown in FIG. 4, the acid gas removal unit 10D-1 according to this embodiment, corrosion-causing substances emitted from the top 14c of the regenerator 14, the carrier gas 41 to entrain the acid gas, to condense moisture It has a regeneration tower condenser section 40. The regeneration tower condenser section 40 is provided in the top portion 14c side from the rich solution introducing portion 14a of the regeneration tower 14, the carrier gas 41 is cooled by cooling water 70a inside of the regenerator 14, and gas-liquid separation condenser water 44 and CO 2 and the rectifying section 70b for separating the gas 45, and condensed water receiving part 70c for storing the condensed water 44, withdrawn condensate 44 condensed water receiving unit 70c, a reflux water circulation in the top side of the regenerator 14 a circulation line 70d to circulate by a pump 46 is interposed in the circulation line 70d, a cooler 70e to cooled cooling water 70a by condensed water 44 external cooling water CW, the condensation draining unloading portion of the condensed water receiving portion 70c comprising from 14f, the condensed water 44 drawn, and a third condensate draining unloading lines 14 g-3A that connect to the lean-solution supply line 53 between the rich lean solution heat exchanger 52 and the absorption tower 13 That.
[0051]
　Further, as shown in FIG. 5, the acid gas removal unit 10D-2 according to the present embodiment, the third instead of providing the condensed water drainage and out lines 14 g-3A, circulation line 70d of the cooler 70e and reflux water circulation pump 46 from between the condensed water 44 withdrawn, it is provided with a third condensate draining unloading lines 14 g-3B to connect to the lean-solution supply line 53 between the rich lean solution heat exchanger 52 and the absorption tower 13 it may be.
[0052]
　Further, as shown in FIG. 6, the acid gas removal unit 10D-3 according to the present embodiment, the third condensate draining unloading lines 14 g-3A, instead of providing a 14 g-3B, a cooler 70e circulation line 70d from between the cooling water inlet portion 70f, extracting cooling water 70a, the fourth condensate draining unloading lines 14 g-4 to be connected to the lean-solution supply line 53 between the rich lean solution heat exchanger 52 and the absorption tower 13 the may be provided.
[0053]
　According to this embodiment, the top portion 14c side from the rich solution introducing portion 14a of the regeneration tower 14, corrosion-causing substances (NH 3 ), CO 2 from the accompanying gas 41 entraining, regenerator condenser unit for condensing water 40 is provided by a large amount of cooling water 70a, the carrier gas 41 is cooled, condensed moisture, and gas-liquid separation.
[0054]
　In this embodiment, in order to increase the gas-liquid contact efficiency in the concentration portion 70b of the top portion 14c, circulating the condensed water 44 collected in the condensed water receiving portion 70c into the circulation line 70d of the top of the regeneration column in, and increasing the condensed water flow rate at the gas-liquid contact portion of the rectifying section 70b. A part of the third condensation draining unloading lines 14 g-3A of the condensed water 44, withdrawn by 14 g-3B, or withdrawing a portion of the cooling water 70a by a fourth condensate draining unloading lines 14 g-4, regenerator 14 mixing from the bottom 4b to the lean solution 12B withdrawn.
[0055]
　In this embodiment, it is possible to increase the condensate flow rate of the cooling water 70a in the rectifying section 70b of the regenerator 14, because the growing gas-liquid contact efficiency between the carrier gas 41, CO 2 amine entrained in the gas absorption it is possible to increase the recovery efficiency of the condensed water 44 in component.
[0056]
　The third condensate draining unloading line 14g-3A, 14g-3B, 4 by placing the condensate drainage and out lines 14 g-4 of lean solution 12B and condensed water 44 (the cooling water supplied to the absorption tower 13 by mixing with 70a) NH corrosion-causing substances in the lean solution 12B 3 by increasing the concentration, the new NH from untreated gas of the absorption tower 13 3 to reduce the absorption of, NH in the untreated gas 3 by reducing the migration amount to condensed water 44, NH in the condensed water 44 3 it is possible to suppress an increase in concentration.
[0057]
　Acid gas removal method according to the present embodiment, the corrosion-causing substances (NH 3 ), CO is an acidic gas 2 gas 11 containing introduced into absorption tower 13, CO in the gas 11 2 and CO 2 absorbing liquid 12 CO by contacting the door 2 CO removing 2 and absorption step, CO 2 rich solution 12A having absorbed and introduced into the absorbent regenerator, CO by reboiler steam 2 and absorbing solution regeneration step of reproducing, CO 2 absorption a step of circulating reused liquid the absorption tower 13 and the regeneration tower 14 by a circulation line, the absorbent solution regeneration step, the column top side of the rich solvent inlet portion 14a inside of the rich solution 12A of the regenerator 14 is introduced in the regenerator condensation step of condensing water from entrained gas 41, inside of the regenerator 14, the condensed water 44 vapor is condensed by cooling the carrier gas 41 CO 2 and separating the gas 45, the condensed water 44 to the outside Out, cooled to the cooling water, and a reflux step of refluxing from the top portion 14c side of the regenerator 14, the condensed water 44 withdrawal, the lean solution 12B circulating in the absorption tower 13 and the condensed water 44 containing the corrosion-causing substances and a step to join.
[0058]
　According to the acid gas removal process, the lean solution 12B to be supplied to the absorption tower 13 by mixing the condensed water 44, NH corrosion-causing substances in the lean solution 12B 3 by increasing the concentration, only the absorption tower 13 new NH from the processing gas 3 to reduce the absorption of, NH in the raw gas 3 by reducing the migration amount to condensed water 44, NH in the condensed water 44 3 to suppress an increase in concentration can.
DESCRIPTION OF SYMBOLS
[0059]
　10A ~ 10C, 10D-1 ~ 10D-3 acid gas removal system
　11 introducing gas
　(gas) 12 CO 2 absorbing solution
　12A rich solution
　12B lean solution
　13A CO 2 absorbing section
　13 CO 2 absorption tower
　14 absorbent regenerator
　41 accompanying gas
　42 condenser
　43 gas-liquid separator
　44 regenerator condensate
　45 CO 2 gas
　46 reflux water circulation pump
　50 the rich solution supply line
　51 rich solution pump
　52 rich lean solution heat exchanger
　53 lean-solution supply line

WE claims

[Requested item 1]
　Corrosion-causing substances, and acid gas absorption tower having an acid gas absorbing portion by contacting the acid gas in the gas containing acid gases and the acid gas absorbing liquid to remove acid gases,
　reboiler rich solution having absorbed acid gases and absorbent regenerator for regeneration by steam,
　with withdrawing the rich solution from the acid gas absorption tower, and the rich solution supply line to be introduced into the rich solution introduction part of the top portion of the absorbing solution regeneration tower,
　wherein lean-solution supply line that acid gases reproduced by the absorbing solution regeneration tower with extracting the lean solvent that is dissipated from the bottom of the absorbing solution regeneration tower is introduced into the acid gas absorption tower and reused as an acid gas absorbing liquid When,
　the rich solution supply line and the rich lean solution heat exchanger provided in the intersections of the lean-solution supply line,
　corrosion causes which have been discharged from the top of the regeneration tower From entrained gases entrained acid gas, anda regeneration tower condenser unit for condensing water,
　the regenerator condenser section,
　and a gas discharge line for discharging the carrier gas from the top of the regeneration tower,
　the gas and interposed in the discharge line cooler,
　the gas-liquid separator vapor by cooler separates the condensed regeneration tower condensed water and acid gases,
　the regenerator condensed water the rich solution introduction part than a reflux line for refluxing the condensed water inlet portion of the top portion side,
　and the condensed water receiving portion for storing the regeneration tower condensed water introduced by the return line,
　Wherein the regeneration tower condensed water from the condenser drainage and out of the condensed water receiving unit extracting, acid gas removal apparatus characterized by comprising a first condenser draining unloading line to be connected to the lean-solution supply line.
[Requested item 2]
　According to claim 1,
　wherein instead of the first condensing draining unloading the regenerator condensed water by the line of withdrawal,
　withdrawn part of the regenerator condensate before introduction into the condensed water inlet portion, the lean-solution supply line acid gas removal apparatus characterized by comprising a second condensing draining unloading line to be connected to.
[Requested item 3]
　According to claim 1 or 2,
　the gas flow downstream side of the acid gas absorption tower the acid gas absorbing unit includes a cleaning unit for cleaning the gas acid gas is removed by washing water circulating,
　the washing water , acid gas removal apparatus characterized by merging some or all of the regeneration tower condensed water.
[Requested item 4]
　Corrosion-causing substances, and acid gas absorption tower having an acid gas absorbing portion by contacting the acid gas in the gas containing acid gases and the acid gas absorbing liquid to remove acid gases,
　reboiler rich solution having absorbed acid gases and absorbent regenerator for regeneration by steam,
　the acid with a gas absorption tower extracting the rich solution, and the rich solution supply line for introducing the rich solution introducing portion of the top side of the absorbent regenerator,
　the absorbent solution with withdrawn lean solution regenerated acid gas is dissipated in the regeneration tower from the bottom of the absorbing solution regeneration tower is introduced into the acid gas absorption tower, the lean-solution supply line for reuse as the acid gas absorbing fluid,
　wherein a rich lean solution heat exchanger provided at an intersection of the rich solution supply line and the lean-solution supply line,
　corrosion-causing substances emitted from the top of the regeneration tower, acid From carrier gas entraining a gas, anda regeneration tower condenser unit for condensing water,
　the regenerator condenser unit is
　provided on the top portion than the rich solution introducing portion of the regeneration tower, the entrained gas the cooled with cooling water inside of the regenerator, and concentrated portion by gas-liquid separation to separate the regeneration tower condensed water and acid gases
　and condensed water receiving portion for storing the regenerator condensed water,
　received the condensed water extracting the regenerator condensed water parts, a circulation line for circulating the reflux water circulation pump on the top side of the regenerator,
　is interposed in the circulation line, the cooling device for the cooling water to cool the regenerator condensed water When,
　From the condenser drainage unloading portion of the condensed water receiving unit, or from between the cooler and a reflux water circulating pump of the circulation line, extracting the regenerator condensed water, the third condensation draining unloading to be connected to the lean-solution supply line acid gas removal apparatus characterized by comprising a line, a.
[Requested item 5]
　According to claim 4,
　in place of withdrawal of the regeneration tower condensed water by the third condensing draining unloading line,
　comprises a portion of the cooling water, the fourth condensate draining unloading line to be connected to the lean-solution supply line acid gas removal unit, characterized by.
[Requested item 6]
　Corrosion-causing substances, a gas containing acid gases is introduced into acid gas absorption tower, the acid gas absorption step to remove acid gases by contacting the acid gas and the acid gas absorbing liquid in the gas,
　it absorbs acid gases the rich solution is introduced into the absorbent regenerator has an absorption solution regeneration step of regenerating the acid gas by reboiler steam,
　recirculated by the acid gas absorbing fluid wherein the acid gas absorption tower and the absorbent regenerator and the circulation line a step of utilizing,
　in the absorption solution regeneration step, the absorbent regenerator of corrosion-causing substances separated externally from the carrier gas to entrain the acid gas, and regenerator condensation step of condensing the moisture,
　the carrier gas a step of cooling to steam to separate the condensed regeneration tower condensed water and acid gases,
　reflux the regenerator condensed water, at the top portion side of a position where the rich solution of the absorbing solution regeneration tower is introduced tooth A reflux step of storing,
　extracting the regenerator condensed water was refluxed, to have a, a merging step of merging the said regenerator condensed water containing lean solution and the corrosion-causing substances circulating in the acid gas absorption tower acid gas removal method characterized.
[Requested item 7]
　Corrosion-causing substances, a gas containing acid gases is introduced into acid gas absorption tower, the acid gas absorption step to remove acid gases by contacting the acid gas and the acid gas absorbing liquid in the gas,
　it absorbs acid gases the rich solution is introduced into the absorbent regenerator, and absorbing solution regeneration step of regenerating the acid gas by reboiler steam,
　a step of circulating reused by the acid gas absorbing liquid with acid gas absorption tower absorbent regenerator and the circulation line When,
　in the absorption solution regeneration step, at the top portion side of a position where the rich solution of the interior of the regenerator is introduced, to condense the moisture from the carrier gas corrosion causing substances accompanied by water vapor, acid gases are entrained a regenerator condensation step,
　within said regenerator, extracting and separating the regeneration tower condensed water and acid gas steam is condensed by cooling the carrier gas, the regeneration tower condensed water to the outside, cooling do it And却水has a reflux step of refluxing from the top side of the regenerator, extracting the regenerator condensed water, a step of merging the condensed water containing the lean solution and the corrosion-causing substances circulating in the absorption tower, the acid gas removal wherein the.
[Requested item 8]
　According to claim 6 or 7,
　the gas flow downstream side of the acid gas absorption tower acid gas absorbing unit includes a cleaning step of cleaning the gas acid gas is removed by washing water circulating,
　the washing water , acid gas removal method characterized by merging some or all of the regeneration tower condensed water.