The present invention relates to a gas purification system provided with the gas combustion apparatus and the combustion treatment method, a gas combustion apparatus.
BACKGROUND
[0002]
　For example, when using coal as fuel for power generation and gasification, the product gas sulfur compounds (hydrogen sulfide, carbonyl sulfide, etc.) are included nitrogen compounds such as, ammonia, pollution prevention, wet from the viewpoint of preventing corrosion It is removed by purification equipment. The wet purified hydrogen sulfide which is removed by equipment (H 2 S) is stripped high concentration of hydrogen sulphide-containing off-gas (H 2 is discharged as S off-gas). Moreover, the recovered ammonia (NH 3 ) are similarly stripped treated with ammonia-containing off-gas (NH 3 is discharged as off-gas). The off-gas discharged hydrogen-containing sulfide gas, ammonia gas, for example, are combusted is introduced immediately燃式combustion apparatus (Patent Document 1). By using this straight燃式combustion device, it can be processed and the hydrogen-containing gas and ammonia gas sulfide in a single sequence, simplification of the processing system is achieved.
CITATION
Patent Document
[0003]
Patent Document 1: JP 2003-130326 JP
Summary of the Invention
Problems that the Invention is to Solve
[0004]
　However, coal and product gas gasified is contained hydrogen cyanide (HCN) is also ammonia from wastewater treatment facility that processes waste water stripping, hydrogen cyanide-containing gas is generated as a cyan off, a problem that is there. When the cyan density of the cyan offgas low, although it is possible to air release performs air dilution, if the cyan density of the cyan offgas is high, although the treatment with typical combustion furnace, the reduction of NOx generation it is difficult, there is a problem in that.
[0005]
　Therefore, ammonia-containing gas, the emergence of technologies to process all hydrogen cyanide-containing gas and hydrogen sulfide-containing gas in a single processing apparatus has been desired.
[0006]
　In view of the above problems, with ammonia-containing gas, hydrogen cyanide and all the gas combustion treatment unit and the combustion treatment method that can be handled by a single processor of the hydrogen sulfide-containing gas, a gas combustion apparatus Gas and to provide a purification system.
Means for Solving the Problems
[0007]
　The first aspect of the present invention to solve the above problems, ammonia-containing gas, a gas combustion apparatus for combustion treatment of hydrogen cyanide-containing gas and hydrogen sulfide-containing gas, the fuel and the ammonia-containing gas and the hydrogen cyanide-containing gas introducing the air, a first combustion section for reducing combustion less than air ratio 1, it is provided on the downstream of the first combustion section, a reducing atmosphere, the first combustion sent from the first combustion unit a second combustion section, provided on the downstream of the second combustion unit, the second combustion gas coming from the second combustion unit, the hydrogen sulfide-containing gas air reducing combustion of nitrogen oxides in the gas in the gas combustion treatment apparatus characterized by comprising a third combustion section for burning it is introduced together.
[0008]
　The second invention is the first invention, the second combustion unit, is a hydrogen sulfide-containing gas to the gas combustion apparatus, characterized in that of reducing the combustion is introduced together with air.
[0009]
　The third invention is the invention of the first or second air ratio in the second combustion section is in a gas combustion treatment unit being larger than the air ratio in the first combustion section.
[0010]
　A fourth invention, in any one invention of the first to third, in the gas combustion treatment apparatus characterized by a plurality of fuel inlet portion for introducing fuel into the first combustion section.
[0011]
　A fifth invention is an ammonia-containing gas, a gas combustion method of burning process hydrogen cyanide-containing gas and hydrogen sulfide-containing gas, introducing a fuel and the ammonia-containing gas and the hydrogen cyanide-containing gas air, less than the air ratio of 1 a first combustion step of reducing the combustion, provided on the downstream of the first combustion process, the reducing combustion under a reducing atmosphere, the nitrogen oxides in the first combustion gas coming from the first combustion process and second combustion step, provided on the downstream of the second combustion process, the second combustion gas coming from the second combustion process, thereby burning the hydrogen sulfide-containing gas is introduced together with the air, the third combustion process When, in the gas combustion treatment method characterized in that it comprises a.
[0012]
　Sixth invention, in the fifth aspect, the second combustion step, in the gas combustion treatment method for causing reduction burning hydrogen sulfide-containing gas is introduced together with air.
[0013]
　A seventh aspect of the invention of the fifth or sixth, air ratio in the second combustion step is a gas combustion treatment method being larger than an air ratio of the first combustion process.
[0014]
　Eighth invention converts a gasification power generation equipment comprising a gasification furnace to produce a product gas with an oxidizing agent and fuel, carbonyl sulfide in the product gas generated in the gasification furnace (COS) to hydrogen sulfide and COS conversion unit, provided on the downstream side of the COS conversion unit, the a washing section for the product gas is washed, it is provided on the downstream side of the washing unit, hydrogen sulfide removal to remove hydrogen sulfide in the product gas and towers, and the ammonia removal unit for removing ammonia in the waste water from the washing unit, and a waste water treatment unit for processing the waste water ammonia has been removed, a gas containing hydrogen sulfide from the hydrogen sulfide removal tower, the ammonia a gas containing ammonia from the removing section, to characterized in that it comprises a gas combustion treatment apparatus according to any one invention of the first to fourth to fuel processing and gas containing hydrogen cyanide from the waste water treatment unit In the gas purification system.
The invention's effect
[0015]
　According to the present invention, in the gas combustion treatment device having three combustion portion contiguous, the ammonia-containing gas and the hydrogen cyanide is burned in a reducing atmosphere, by oxidative combustion and then hydrogen sulfide-containing gas, a single processor in ammonia-containing gas, it is possible to efficiently process all gases hydrogen cyanide-containing gas and hydrogen sulfide-containing gas.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016]
[1] Figure 1 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a first embodiment of the present invention.
FIG. 2 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a second embodiment of the present invention.
FIG. 3 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a third embodiment of the present invention.
[4] FIG. 4 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a fourth embodiment of the present invention.
FIG. 5 is a diagram schematically showing an example of a configuration of a gas combustion apparatus according to a fifth embodiment of the present invention.
FIG. 6 is a diagram schematically showing an example of a gas purification system for a gas combustion treatment apparatus is suitably used according to the sixth embodiment of the present invention.
DESCRIPTION OF THE INVENTION
[0017]
　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
[0018]
　Figure 1 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a first embodiment of the present invention. As shown in FIG. 1, a gas combustion treatment unit 10A according to the present embodiment, ammonia-containing gas 12, a gas combustion apparatus for combustion treatment of hydrogen cyanide-containing gas 13 and hydrogen sulfide-containing gas 14, the fuel 11 and ammonia-containing introducing a gas 12 and the hydrogen cyanide-containing gas 13 and the air 25, a first combustion section 21 that reduces the combustion below the air ratio of 1, provided on the downstream of the first combustion section 21, a reducing atmosphere, the first combustion the nitrogen oxides in the first combustion gas 21A sent from part 21 and the second combustion section 22 to reduce combustion, provided on the downstream of the second combustion section 22, transmitted from the second combustion section 22 second combustion gases 22A, is burned with hydrogen sulfide-containing gas 14 is introduced together with the air 25, it is intended to include the third combustion section 23. Here, the air ratio, the amount of air supplied when the fuel 11 burns, refers to a value obtained by dividing the theoretical amount of air.
[0019]
　In the first combustion unit 21, ammonia (NH with fuel 11 3 introduces a) containing gas 12 and hydrogen cyanide-containing gas 13. Since the gas combustion apparatus 10A is a straight燃式, but introducing fuel 11 in order to cause combustion in the combustion furnace, the introduction is injected from the nozzle 20 of the combustion burner. The introduction of fuel 11 at the same time, by introducing air 25 or the like, to combust the hydrogen cyanide of the fuel 11 and ammonia-containing gas ammonia and hydrogen cyanide-containing gas 13 in 12 in the first combustion section 21.
[0020]
　Combustion temperature in the first combustion section 21 is a high temperature range of, for example, 1250 ° C. ~ 1500 ° C., even more preferably high temperature range of 1300 ~ 1400 ° C.. Such, if the combustion process at a high temperature range (about 12500 ~ 1500 ° C.), since the generation of NOx from ammonia can be suppressed low, preferred. This With high temperature region, the introduced ammonia in first combustion section 21 is exposed to a high temperature, ammonia nitrogen (N 2 ) and water (H 2 is completely combusted in the O).
[0021]
　Further, when the inside the first combustion section 21 to an oxidizing atmosphere, the N content that has been decomposed is NOx, so as not to oxidizing atmosphere, within the first combustion section 21, reduced state in which the air ratio of less than 1 It is a combustion in. Therefore, the air ratio is less than 1, preferably, for example 0.6-0.9, more favorable properly is preferably set to 0.6 to 0.8. Incidentally, since it is impossible to retain the good reactivity when the air ratio is set too low, the lower limit is about 0.6.
[0022]
　Gas introduction position of the ammonia-containing gas 12, hydrogen cyanide-containing gas 13 and air 25 to be introduced into the first combustion section 21 is not particularly limited.
[0023]
　In the gas combustion apparatus 10A, in the first combustion section 21 which is a first part, in a reducing atmosphere, first NH 3 for complete combustion treatment of off-gas and hydrogen cyanide offgas into nitrogen and water. Ammonia supplied here introduced as ammonia gas. For example, when used in the system of coal gasification gas, (in later Fig. 6, reference numeral 111) ammonia removal unit for removing ammonia in the waste water ammonia-containing gas 12 recovered in the not condensed, as it is a gas introducing the first combustion portion 21 in the form. Also, waste water treatment unit for treating the waste water to remove the ammonia Fugasu ammonia removal unit (in later Fig. 6, reference numeral 113) the hydrogen cyanide offgas from, introduced as hydrogen cyanide-containing gas 13 to the first fuel portion 21.
[0024]
　First combustion gas 21A which is burned in the first combustion section 21 is sent to the second combustion unit 22 on the downstream as it is. In the second combustion section 22 is a nitrogen oxide reduction unit, a reducing atmosphere, the nitrogen oxides in the first combustion gas 21A sent from the first combustion section 21 is reduced. Here, ammonia (NH in the first combustion section 21 3 when burning processes) and hydrogen cyanide (HCN), because nitrogen oxides (NOx) are generated in a trace amount, reducing atmosphere inside the second combustion section 22 at ambient, the NOx N 2 is reduced to reduce the NOx contained in trace amounts in the first combustion gas 21A.
[0025]
　That, within the second combustion section 22 where the first combustion gas 21A is introduced, and a reducing atmosphere. This is in order to continuously perform the high-temperature combustion in the first combustion section 21, but is possible to reheating the fuel 11 was charged and burned in the grade which is not is an oxidizing atmosphere is required, partially oxidized since NOx is generated in small amount if it is, by a lower aggressively reducing atmosphere within the second combustion unit 22, N by reducing the NOx contained in the first combustion gas 21A 2 as there.
[0026]
　Combustion temperature in the second combustion section 22 is, for example, 1300 ° C. ~ 1600 ° C., more preferably for example 1400 ℃ ~ 1500 ℃. The air ratio in the second combustion section 22 less than 1, preferably 0.7-0.9, more favorable properly is 0.8 to 0.9.
[0027]
　Add the air 25 into the second combustion unit 22, by increasing the air ratio than the air ratio in the first combustion section 21, unburned NH present in the first combustion gas 21A 3 as to burn and unburned NH 3 can be reduced unlimitedly.
[0028]
　Therefore, when the air ratio in the first combustion section 21 is, for example, 0.7 to 0.8, it is preferable to adjust the air ratio for example, 0.8-0.9 in the second combustion section 22 . Or if the air ratio in the first combustion section 21 is, for example, 0.8 to 0.9, it is preferable to adjust the air ratio for example from 0.85 to 0.95 and in the second combustion section 22.
[0029]
　Here, in the second combustion section 22, what was decided not to introduce hydrogen sulfide-containing gas 14 is because devoted to reduction treatment of NOx.
[0030]
　The second combustion gas 22A that has NOx concentration was reduced in the second combustion section 22 is sent to the third combustion section 23 of the downstream further. In the third combustion section 23, it is combusted with a hydrogen sulfide-containing gas 14 to be introduced separately introduced together with air 25.
[0031]
　Hydrogen sulfide gas, because it can be processed by the low temperature range (800 ° C. or higher), the hydrogen sulfide-containing gas 14 under an oxidizing atmosphere, water (H 2 O) and sulfur dioxide (SO 2 to combustion treatment in a).
[0032]
　The third combustion section 23, as a routine 800 ° C. ~ 900 approximately ° C., and the temperature of hydrogen sulfide that usually self ignite. Also hydrogen sulfide thin concentration is a substance that easily burn as long as certain level of high temperature, self Mosul if 800 ° C. or higher. Thus, by mixing with the second combustion unit 22 (nitrogen oxide reduction section) of more than 1000 ° C. coming from the second combustion gas 22A, burning it as a heat source.
[0033]
　The air quantity in the third combustion section 23, the oxygen concentration of 0.8-2.5 vol% in the flue gas 41 discharged from the third combustion section 23, preferably with 1.0-2.0 volume% so as to, it is preferable to adjust the introduction amount of the air 25.
[0034]
　Here the hydrogen sulfide-containing gas 14 to be introduced in are the high calorie high component concentration in the gas, the fuel 11 Upon combustion is usually unnecessary. However, it may be separately added to the fuel 11, if necessary.
[0035]
　According to this embodiment, in the gas combustion apparatus having three combustion section consecutive, in the first combustion section 21, since the ammonia-containing gas 12 and hydrogen cyanide-containing gas 13 is combusted in a reducing combustion atmosphere, mostly generated NOx without, it can be combusted. Next, in the second combustion section 22, the NOx generated in a trace amount is the reduction treatment, and then the third combustion section 23, to an oxidizing atmosphere combustion process by introducing hydrogen sulfide-containing gas 14. This makes it possible to efficiently process all gas in a single gas combustion treatment unit 10A.
Example 2
[0036]
　Then, in this embodiment, with reference to FIG. 2, also described manner to combustion treatment by introducing hydrogen sulfide-containing gas 14 to the second combustion section 22. Note that the members that overlap with the gas combustion treatment apparatus of Example 1, and duplicate explanations are given the same reference numerals will be omitted. In the gas combustion treatment unit 10A in FIG. 1, without introducing hydrogen sulfide-containing gas 14 into the second combustion unit 22, had priority to reduction treatment in NOx, in this embodiment the second combustion section 22 may be performed combustion process be introduced hydrogen sulfide-containing gas 14.
[0037]
　Figure 2 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a second embodiment of the present invention. In the gas combustion treatment unit 10B shown in FIG. 2, branches the line for introducing a hydrogen sulfide-containing gas 14 is introduced hydrogen sulfide-containing gas 14 to the second combustion section 22 and the third combustion section 23. The amount of excess oxygen in the first combustion gas 21A flowing down from the first combustion section 21 in this case to the second combustion section 22 is generally about 0.1 to 3 mol% range, more specifically about 0. it is preferably controlled at 5 to 1 mol% of the range. Thus, input amount control of hydrogen sulfide-containing gas 14 for converting the second combustion section 22 to the reducing atmosphere is facilitated.
[0038]
　Charge ratio ratio in the second combustion section 22 and the hydrogen sulfide-containing gas 14 into the third combustion section 23, not to be arbitrarily determined particularly limited differs because by such properties, content of the gas to be treated. In the case for example of a coal gasification gas hydrogen sulfide gas treatment in gas purification systems, typically, the second combustion section 22 5-20 volume%, the third aspect of introducing 80 to 95 volume% in the combustion section 23 it is preferred. Incidentally, when the combustion treatment of hydrogen sulfide, introduction of the fuel 11 into the second combustion unit 22 is unnecessary. This combustion temperature in the second combustion unit 22, since for example, 1300 ° C. ~ 1600 ° C., the hydrogen sulfide to be introduced is because that the self ignite.
[0039]
　Incidentally, the combustion temperature in the second combustion section 22 is, for example, 1300 ° C. ~ 1600 ° C., more preferably for example 1400 ℃ ~ 1500 ℃. The air ratio in the second combustion section 22 less than 1, preferably 0.7-0.9, more favorable properly is 0.8 to 0.9.
[0040]
　The third combustion section 23 is usually 800 ° C. ~ 1300 ° C., more preferably for example 900 ℃ ~ 1100 ℃. The air quantity in the third combustion section 23, the oxygen concentration of 0.8-2.5 vol% in the flue gas 41 discharged from the third combustion section 23, preferably with 1.0-2.0 volume% so as to, it is preferable to adjust the introduction amount of the air 25.
[0041]
　According to this embodiment, in the second combustion section 22, but introducing a hydrogen sulfide-containing gas 14, when NOx is generated in the first combustion section 21 is small, a small amount of hydrogen sulfide together with reduction of NOx burned, it is possible to perform the combustion treatment under an oxidizing atmosphere to reduce the introduction amount of hydrogen sulfide-containing gas 14 to be processed in the third combustion section 23 efficiently. This makes it possible to efficiently process all gas in a single gas combustion treatment unit 10A.
Example 3
[0042]
　Then, in this embodiment, with reference to FIG. 3, illustrating another embodiment in which the supply of fuel supplied to the first combustion section 21. Note that the members that overlap with the gas combustion treatment apparatus of Example 1, and duplicate explanations are given the same reference numerals will be omitted. First fuel 11 supplied to the combustion section 21 in the first embodiment, as shown in FIG. 1, but with one nozzle 20 as a fuel inlet section, the present invention is not limited thereto, it may be multiple.
[0043]
　Figure 3 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a third embodiment of the present invention. As shown in FIG. 3, and the three fuel inlet line for introducing the first combustion portion 21. For example, if the center of the nozzle of the fuel inlet portion and a main nozzle 20a, the sub-nozzles 20b on both sides, it is arranged 20c, and by changing the sub-nozzle 20b, the supply ratio of fuel to 20c. The ratio of the change, for example, in the case of the 70% of the total supply amount of fuel supplied to the main nozzle 20a, the sub-nozzle 20b is a fuel ratio of 2 percent, the sub-nozzles 20c is a fuel ratio 10%. Thus, it is possible to diversify the combination of the combustion state. For example, when the supply amount of the fuel 11 is small, supplying fuel only to the main nozzle 20a. Or a combination of the main nozzle 20a and the sub-nozzles 20b or sub-nozzle 20c. Accordingly, when the plant starts, it is possible to finely adjust the in the stop or the like. The ratio of the fuel ratio can be appropriately changed.
[0044]
　Thus, as the gas combustion treatment unit 10A 1, it can be prevented from being over-burning, such as combustion by one nozzle (1500 ° C. or higher).
　Further, from when the burner is also one, it is possible to finely adjust the combustion other than the adjustment of the supply amount of the fuel 11. Thus, with respect to the amount of gas to be treated can be adjusted for optimum combustion temperatures.
[0045]
　According to this embodiment, by providing a plurality of nozzles which is the fuel feed point of the combustion burner, with respect to the amount of gas to be treated, you can adjust the combustion temperature. By managing the combustion temperature, and the generation of NOx in the first combustion section 21, and a generation of SOx in the third combustion section 23 can be suppressed.
Example 4
[0046]
　Then, in this embodiment, a description will be given of another embodiment in which the supply of air 25 to be introduced to the first to third combustion section 21-23. Note that the member that overlaps with the gas combustion apparatus of Embodiment 1, and duplicate explanations are given the same reference numerals will be omitted. In the present embodiment, the adjustment of the air 25 supplied to the first to third combustion section 21-23, the oxygen concentration in the combustion exhaust gas 41 discharged from the outlet side of the third combustion section 23 by the oxygen concentration meter while managing, and each adjusting the amount of air.
[0047]
　Figure 4 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a fourth embodiment of the present invention. As shown in FIG. 4, the oximeter 43 installed in the exhaust line of the combustion exhaust gas 41 discharged from the third combustion section 23, measures the oxygen concentration in the combustion exhaust gas 41. The off-gas was introduced into the first combustion section 21 and the second combustion section 22 (ammonia-containing gas 12, hydrogen cyanide-containing gas 13) from the amount and the air amount, the oxygen in the combustion exhaust gas 41 at the outlet of the third combustion section 23 as the concentration of the target value, calculates the amount of air necessary to the third combustion section 23 by the arithmetic processing unit (not shown). And so that the calculated air volume, a control device (not shown) commanded by the combustion process in the third combustion section 23 to properly manage the oxygen concentration by introducing air 25 with the hydrogen sulfide-containing gas 14 It can be carried out.
[0048]
　According to this embodiment, by installing an oxygen concentration meter 43, while managing the oxygen concentration in the combustion exhaust gas 41, at each combustion unit 21-23, the ammonia-containing gas 12 to be introduced, hydrogen cyanide-containing gas 13 and sulfide it can be processed reliably combustion process of the hydrogen-containing gas 14.
[0049]
　The gas combustion treatment apparatus of the present invention, the gas in the vicinity of 900 ° C. is exhausted as combustion exhaust gas 41, by installing and waste heat recovery boiler (WHB) 42 downstream of the combustion furnace, for heat recovery be able to. Hydrogen sulfide (H 2 SO generated due to the combustion of S) 3 generation amount of a straight-燃式combustion furnace is higher than the regenerative combustion furnace. SO the dust 3 can not exhaust gas desulfurizer (not shown) of the slipstream at sufficiently removed, if a straight燃式, SO on the downstream of the combustion furnace 3 is necessary equipment such as can be removed. Specifically, the exhaust gas after the straight燃式combustion furnace is thermally collected to approximately 300 ° C. at the waste heat recovery boiler (WHB) 42, SO in wet cooling tower (not shown) 3 contacting the water Te recovered as sulfuric acid. Incidentally, SO 3 dissolves almost 100% in water. Since the wet cooling tower (not shown) in sulfuric acid mist is generated, can not be removed sufficiently by the flue gas desulfurization apparatus of flow after sulfuric acid mist (not shown), wet on the downstream of the wet cooling tower (not shown) to electrostatic precipitator a sulfuric acid mist is provided an electrostatic precipitator (EP) (not shown).
Example 5
[0050]
　The use of gas combustion treatment apparatus of the present invention as described above, the ammonia-containing gas 12, a hydrogen cyanide-containing gas 13 and hydrogen sulfide-containing gas 14 in a single combustion apparatus, can be combusted highly efficiently, its structure is not limited by this embodiment, it can be more specifically mentioned as an example embodiment having the device structure shown in FIG. 5, for example. Note that the member that overlaps with the gas combustion apparatus of Embodiment 1, and duplicate explanations are given the same reference numerals will be omitted.
[0051]
　Figure 5 is a diagram schematically showing a schematic configuration of a gas combustion apparatus according to a fifth embodiment of the present invention. As shown in FIG. 5, a first combustion section 21 between the second combustion section 21, the narrow portion (throttle portion) 31 is formed. The narrow portion (diaphragm portion) 31, the gas is brought to a state as easily distributed and mixed. Also, the inlet side of the third combustion section 23, the partition portion 32 is disposed. The partition portion 32 is made of a high temperature ceramic material or the like, a radiation shield of the perforated plate or the like of the radiation shielding purposes, the temperature difference between the second combustion section (nitrogen oxide reduction unit) 22 and the third combustion section 23 the is causing.
[0052]
　With the device structure of this embodiment, the distribution and mixing of the first combustion gas 21A to be introduced into the second combustion unit 22 is improved. Further, since the second combustion unit 22 are imparted a difference in combustion temperature of the third combustion section 23, thereby ensuring the temperature difference by installing the partition 32.
[0053]
　Very environmental load becomes lower if such a process. Process gases of interest in the present invention is not limited in particular, ammonia-containing gas 12, gas is widely processed containing hydrogen cyanide-containing gas 13 and hydrogen sulfide-containing gas 14, specifically, for example, ammonia-containing gas 12, and a coal gasification gas containing a large amount of hydrogen cyanide-containing gas 13 and hydrogen sulfide-containing gas 14.
Example 6
[0054]
　Next, the gas combustion treatment unit 10A ~ 10D of the present invention, in a system in which coal is gasified for use as fuel to generate electricity, as part of the system at later stage of the hydrogen sulfide removal step with an amine, coal gasification gas wet it can be used as a purification offgas combustion furnace. Using the processing device of the present invention as described above, In such ammonia-containing gas and hydrogen sulfide-containing gas to be processed simultaneously system can be promoted very efficiently respective off-gas treatment. Specifically, the combustion device described above can be suitably used in the combustion process of a purification system as shown in FIG.
[0055]
　First, an example of a gas purification system which the combustion apparatus of the present embodiment is suitably implemented will be described with reference to FIG. Figure 6 is a diagram schematically showing an example of a gas purification system for a gas combustion treatment apparatus is suitably used according to the sixth embodiment of the present invention. Gas purification system 100 is provided together with the coal to the coal gasification power generation equipment for the power generation fuel is gasified. As shown in FIG. 6, for example, a gas purification system 100 includes a fuel and oxidant in the gasification power generation equipment comprising a gasification furnace to produce a product gas 101 (not shown), the product gas generated in the gasification furnace 101 carbonyl sulfide in (COS) hydrogen sulfide (H 2 and COS converter 103 for converting the S), provided on the downstream side of the COS conversion unit 103, a washing section 104 for washing the produced gas 101, water washing unit 104 provided on the downstream side of, H to remove hydrogen sulfide in the product gas 101 2 and S removal column 106, and the ammonia removal unit 111 for removing ammonia in the waste water 105 from the water washing section 104, the ammonia was removed It includes a wastewater treatment unit 113 for processing the waste water 112. Reference numeral L 1 ~ L 9 is a gas line, L 11 ~ L 12 illustrates the drain line.
[0056]
　Product gas 101 generated in the gasification furnace (not shown), the gas line L 1 is cooled via the heat exchanger 102 interposed in the gas at COS conversion unit 103 COS (carbonyl sulfide: carbonyl sulfide ) is H 2 after being converted to S, is cooled through a heat exchanger 102, the gas line L 2 most of ammonia in the gas at washing unit 104 interposed are incorporated into the waste water 105. Then, ammonia (NH 2 ) product gas 101 that has been cleaned processed are removed, the gas line L 3 by H 2 is sent to S removal tower 106, H 2 S is removed. H 2 In S removal tower 106, H in the product gas 101 that has been cleaned treated with absorption liquid 2 has a configuration in which S, sulfur compounds such as COS are removed to less than the allowable concentration of the gas turbine (GT).
[0057]
　H 2 absorbent that has absorbed the sulfur compounds in S removal column 106 is sent to the absorption regeneration tower (not shown), H being absorbed by heating 2 has the S desorbed and reproduced. H 2 product gas 101 to remove the S is the gas line L 4 is supplied each heat exchanger interposed (e.g. GGH) 102, 102 are heated by through the gas turbine (GT). Then, H 2 hydrogen sulfide-containing gas 14 containing S, after the combustion process is fed to the gas combustion apparatus 10A (10B ~ 10D) is applied, the desulfurization apparatus for treating sulfur oxide flue gas 109 is desulfurized is discharged outside the system from the chimney 110 at. On the other hand, NH incorporated into the waste water by the water washing unit 104 3 may drain line L 11 is led to the ammonia removing portion 111 by the waste water 112 to gas-liquid separation at the ammonia removal unit 111, drain line L 12 by It is sent to a waste water treatment unit 113. Then NH 3 ammonia-containing gas 12, waste water treatment unit hydrogen cyanide-containing gas 13 which is off-gas from 113, H is the off-gas from the ammonia removal unit 111 containing 2 S removal tower 106 hydrogen sulfide-containing gas 14 from a gas line L 5 , L 8, L 9 is fed to the gas combustion apparatus 10A (10B ~ 10D) by.
[0058]
　Thus, in the gas combustion treatment unit 10A (10B ~ 10D), as the ammonia-containing gas 12, using ammonia gas drainage 105 and stripper process are separated in the washing step. Thus, ammonia as a reducing agent, it is not necessary to supply to the gas combustion apparatus 10A separately from an external (10B ~ 10D). Moreover eliminates the need to disposal of ammonia, a large device such as the high temperature and high pressure for producing a 100% ammonia is needed because unnecessary, the processing system is compact and simplified. Incidentally, the water washing section 104 in FIG H 4 2 gas line L flowing in S removal tower 106 3 Ammonia little during product gas 101, all of which are incorporated in the waste water. For example in front of the product gas 101 of the washing unit 104, when containing, for example 1000ppm approximately ammonia decreases 10ppm or less in the product gas of the subsequent washing section 104. Further, COS converter 103 (the COS in product gas 101 H 2 is provided upstream of the washing unit 104 as but not limited disposed the step of converting the S), for example, FIG. 4 aspect, and the like.
[0059]
　According to the gas combustion apparatus and the gas combustion treatment method according to the present invention, the ammonia-containing gas 12, the combustion process in a single series offgas hydrogen cyanide-containing gas 13 and hydrogen sulfide-containing gas 14 can be performed, for processing each it is unnecessary processing system simplified.
[0060]
　Process hydrogen cyanide-containing gas 13 that occur as off-gas in the waste water processing section 113 similarly N 2 can be reduction treatment, also without NOx occurs, can be completely detoxified. Further, NH 3 by burning off, disposal costs ammonia water running cost, etc. is not necessary to reduce.
DESCRIPTION OF SYMBOLS
[0061]
　10A, 10B gas combustion treatment unit
　11 the fuel
　12 containing ammonia gas
　13 hydrogen cyanide containing gas
　14 hydrogen sulfide-containing gas
　21 first combustion section
　21A first combustion gas
　22 second combustion section
　22A second combustion gas
　23 third combustion section
　25 air
　L 1 ~ L 8　gas line
　L 11 ~ L 12　drain line
　100 a gas purification system
　101 generates gas
　102 heat exchanger
　103 COS conversion unit
　104 washing unit
　105 effluent
　106 H 2 S removal tower
　GT gas turbine
　109 desulfurizer
　110 chimney
　111 ammonia removal unit
　112 effluent
　113 wastewater treatment unit

WE claims

[Requested item 1]
　Ammonia-containing gas, a gas combustion apparatus for combustion treatment of hydrogen cyanide-containing gas and hydrogen sulfide-containing gas,
　introducing a fuel and the ammonia-containing gas and the hydrogen cyanide-containing gas air, the first combustion to reduce combustion less than air ratio 1 and parts,
　provided on the downstream of the first combustion section, and a second combustion section for reducing combustion under a reducing atmosphere, the nitrogen oxides in the first combustion gas coming from the first combustion unit,
　the provided on the downstream of the second combustion unit, the second combustion gas coming from the second combustion unit, by comprising a third combustion section for burning the hydrogen sulfide-containing gas is introduced together with the air, gas combustion apparatus according to claim.
[Requested item 2]
　In claim 1,
　the second combustion section, the gas combustion treatment unit for causing reduction burning hydrogen sulfide-containing gas is introduced together with air.
[Requested item 3]
　According to claim 1 or 2,
　the air ratio in the second combustion section, the gas combustion treatment unit being larger than the air ratio in the first combustion section.
[Requested item 4]
　In any one of claims 1 to 3,
　the gas combustion treatment apparatus characterized by a plurality of fuel inlet portion for introducing fuel into the first combustion section.
[Requested item 5]
　Ammonia-containing gas, a gas combustion method of burning process hydrogen cyanide-containing gas and hydrogen sulfide-containing gas,
　introducing a fuel and the ammonia-containing gas and the hydrogen cyanide-containing gas air, the first combustion to reduce combustion less than air ratio 1 a step,
　provided on the downstream of the first combustion step, a second combustion step of reducing the combustion under a reducing atmosphere, the nitrogen oxides in the first combustion gas coming from the first combustion process,
　the provided on the downstream of the second combustion process, the second combustion gas coming from the second combustion process, thereby burning the hydrogen sulfide-containing gas is introduced together with the air, and a third burning step, to have a gas combustion treatment method characterized.
[Requested item 6]
　In claim 5,
　the second combustion step, gas combustion treatment method for causing reduction burning hydrogen sulfide-containing gas is introduced together with air.
[Requested item 7]
　According to claim 5 or 6,
　the air ratio in the second combustion step, the gas combustion treatment method being larger than an air ratio of the first combustion process.
[Requested item 8]
　A gasification power generation equipment comprising a gasification furnace to produce a product gas with an oxidizing agent and fuel,
　and a COS converter for converting carbonyl sulfide in the product gas generated in the gasification furnace (COS) to hydrogen sulfide,
　the provided on the downstream side of COS conversion unit, the a washing section for the product gas is washed,
　and the provided on the downstream side of the washing unit, to remove hydrogen sulfide in the product gas hydrogen sulfide removal column,
　wherein the washing unit and ammonia removal unit for removing ammonia in the waste water from,
　and waste water treatment unit for processing the waste water ammonia has been removed,
　a gas containing hydrogen sulfide from the hydrogen sulfide removal tower, the ammonia from the ammonia removal unit gas purification, wherein the gas, by comprising a gas combustion apparatus according to any one of claims 1 to 4, the fuel processor and a gas containing hydrogen cyanide from the waste water treatment unit comprising Stem.