TECHNICAL FIELD
The present disclosure relates to a field of sampling. Specifically, the present
disclosure relates to a system and process for efficient and accurate sampling and
analysis of synthesis gas. Synthesis gas usually generated from a fluidized bed coal
5 gasifier is at high pressure and temperature and high moisture content. More
specifically, the present disclosure relates to a system analyzing high moisture
content synthesis gas at high temperature & high pressure. The present invention also
relates to a process for sampling high pressure, temperature and moisture content
synthesis gas.
10
BACKGROUND
Synthesis gas (also known as syn gas) is a toxic gas, mainly composed of CO & H2.
Syngas is usually a product of gasification and the main application are power and
chemical production. Syngas is combustible and often used as a fuel of internal
15 combustion engines.
Syngas can be produced from many sources, including natural gas, coal, biomass, or
virtually any hydrocarbon feedstock, by reaction with steam (steam reforming),
carbon dioxide (dry reforming) or oxygen (partial oxidation). Syngas is a crucial
20 intermediate resource for production of hydrogen, ammonia, methanol, and synthetic
hydrocarbon fuels. Syngas is also used as an intermediate in producing synthetic
petroleum for use as a fuel or lubricant via the Fischer–Tropsch process and
previously the Mobil methanol to gasoline process.
25 Sampling and analysis of the syngas in a gasifier is required to enable a base case
analysis, and to enable advanced computational methods to be applied for improving
gasifier designs. A major challenge of sampling is due to the higher pressure &
higher temperature in the gasifier. Further, the solid particles & high amount of
moisture (up to 60 mol %) within the syngas poses difficulty in sampling it. For
30 designing of gasifier as well as downstream section hot syngas analysis is very
important & necessary in particular when high concentration of particulate matter is
3
present. Prediction of syngas flow rate with accuracy is also difficult due to dust
choking in gasifier pressure control valve. This implies that there is a need for gas
analysis has to be accurate. The present disclosure relates to an accurate sampling
and analysis of syngas.
5
Reference is made to prior art US2008/0202261A1, wherein an apparatus for
diluting a gas sample is disclosed. The sampling of the gas is done by diluting the
gas so that sampling is possible at lower pressure and temperature without
condensation. The prior art overcomes the problem of sampling by diluting the gas.
10 However, for synthesis gas which contains substantial amount of water, a huge
amount of diluting is required i.e. the dilution as per prior art need high amount of
dilution gas. One problem of this is the requirement of high dilution and the other
problem is that the high dilution may fade the trace components/contaminants. These
will be so diluted it would not be traced by analyzers effectively and will lose its
15 merit of sampling and analysis for quantification and performance predictions of
gasifier.
Reference is also made to patent US 7,849,754 B2. This patent describes sampling
system of syn gas. However, this document is limited to the combined cycle power
20 plants wherein the moisture content in the syn gas is very low. The patent does not
disclose any moisture content in syn gas. This patent is also having limitation in
accurate analysis of syn gas as the syn gas is quenched with nitrogen.
Although the prior arts disclose various analyzing method for synthesis gas, the
25 systems known are either not satisfactory or inaccurate or requires pretreating of syn
gas. Thus, there is still a need for accurate, well designed system for sampling and
analysis of synthesis gas.
In view of this, the inventors of the present disclosure felt a need to develop a system
which overcomes all the problems of the prior arts and is accurate. Particularly there
30 is a need to improve the sampling of the synthesis gas carrying high moisture.
4
An objective of the present invention is to provide a system for accurately sampling
and analysis of the synthesis gas.
It is the aim of the inventors to develop a system for sampling of hot syngas
generated from gasifier unit.
5 Another objective of the present invention is to develop a process for sampling of hot
syngas generated from gasifier unit overcoming the difficulties of the prior art.
The present disclosure overcomes the problems of the current technology by the
claimed system. The present disclosure system can work even on high amount of
moisture without affecting the accuracy of the syngas analysis.
10
SUMMARY OF THE INVENTION
The present disclosure provides a system for sampling of synthesis gas generated
from gasifier unit. The present disclosure relates to a field of sampling and
analyzing. Specifically, the present disclosure relates to a system and process for
15 efficient and accurate sampling and analysis of synthesis gas. Synthesis gas is a high
pressure & temperature gas usually generated from a fluidized bed coal gasifier.
More specifically, the present disclosure relates to a system analyzing high
temperature synthesis gas. Synthesis gas flow which is a hard to detect in fluidized
bed coal gasifier with flow meters. The system of the present invention helps in
20 analyzing the synthesis gas. The present invention also relates to a process for
sampling and analyzing high pressure, temperature and moisture content in the
synthesis gas.
Major components of syn gas sampling system are sample cooler, vapor-liquid
25 separator, filter and arrangement for offline sampling and high moisture laden syn
gas is analyzed in moisture analysis sampling system whose major components are
thimble and water baths.
5
The major components of sampling system include but are not restricted to sample
cooler, vapor-Liquid separator, filter and arrangement for offline sampling. The
sample line also has a pressure reducing valve (PRV) to let down syngas pressure.
The needle valve after PRV is present in syngas sampling line. Further, the sample
5 cooler is a coiled type exchanger with water cooling. The vapor-liquid separator is a
cylindrical vessel with tori spherical ends. The sampling bomb (offline sampling
arrangement) is a high-pressure cylindrical vessel. The filter is of glasswool type.
BRIEF DESCRIPTION OF THE DRAWINGS
10 The invention itself, together with further features and attended advantages, will
become apparent from consideration of the following detailed description, taken in
conjunction with the accompanying drawings. The description of the drawings are
provided below.
15 Figure 1. Shows the sampling system of high pressure and high temperature syngas
according to the invention;
Figure 2. Shows the moisture sampling system of raw syn gas
20
DETAILED DESCRIPTION
While the embodiments in the disclosure are subject to various modifications and
alternative forms, specific embodiment thereof has been shown by way of example
in the figures and will be described below. It should be understood, however that it is
25 not intended to limit the disclosure to the particular forms disclosed, but on the
contrary, the disclosure is to cover all modifications, equivalents, and alternative
falling within the scope of the disclosure.
It is to be noted that a person skilled in the art would be motivated from the present
30 disclosure and modify various constructions of system for high pressure hot syn gas
6
sampling from fluidized bed coal gasifier, which may vary from reactor to reactor.
However, such modification should be construed within the scope and spirit of the
disclosure. Accordingly, the drawing show only those specific details that are
pertinent to understand the embodiments of the present disclosures as not to obscure
5 the disclosure with details that will be readily apparent o those of ordinary skill in the
art having benefit of the description herein.
The terms “comprises”, “comprising”, or any other variations thereof used in the
disclosure, are intended to cover a non-exclusive inclusion, such that a apparatus,
10 system, assembly, mechanism that comprises a list of components does not include
only those components but may include other components not expressly listed or
inherent to such system, or assembly, or apparatus. In other words, one or more
elements in a system or device proceeded by “comprises…a” does not, without more
constraints, preclude the existence of other elements or additional elements in the
15 system or apparatus.
In one embodiment of the invention the present invention relates to a system for a
sampling and analysis of synthesis gas comprising, a dry gas sampler and a moisture
sampler,
20 wherein the dry gas sampler comprises,
- a sample cooler, for cooling the synthesis gas;
- a vapor-liquid separator, for separating the vapor and liquid component of the
synthesis gas
- a filter for particulate removal from the vapor component of the synthesis
25 gas,
- an offline sampling arrangement to obtain the dry gas analysis of the
synthesis gas
the moisture sampler comprises,
- a thimble, for filtering the synthesis gas
30 - a plurality of impinger bottles which are placed in a water bath for
condensing the moisture in the synthesis gas.
7
characterized in that, the dry gas sampler analysis and the moisture sampler analysis
are combined to obtain the sampling and analysis of the synthesis gas.
In another embodiment of the invention the invention relates to the system, wherein
5 the offline sampling arrangement of the dry sampler include a sample bomb and a
gas chromatography.
Yet another embodiment of the invention relates to the system, wherein the synthesis
gas for dry sampler and moisture sampler are taken online from same point and
10 sample source of gasification.
Yet another embodiment of the invention relates to the system, wherein the syngas
comprises high moisture content up to - 60 mol % at 280 0C – 350 0C.
15 Yet another embodiment of the invention relates to the system, wherein the impinger
bottles are at least six in number and the moisture in the synthesis gas is calculated
from gravimetric analysis
Yet another embodiment of the invention relates to the system, wherein the water
20 baths are filled with cold water for maintaining the temperature of the impinger
bottles between 25 oC -40 oC.
Yet another embodiment of the invention relates to the system, wherein the analyzed
synthesis gas is sent to flare for disposal.
25
Yet another embodiment of the invention relates to the system, wherein the synthesis
gas is collected from at least four locations in the plant which needs hot synthesis gas
sampling.
30 Yet another embodiment of the invention relates to the system, wherein the synthesis
gas sent to dry sampler.
8
In another embodiment of the invention the present invention relates to a process for
sampling and analysis of synthesis gas comprising steps of,
- dry gas sampling and analysis step comprising,
5 - cooling the synthesis gas in a sample cooler,
- separating the vapor and liquid component of the synthesis gas, by a vaporliquid separator.
- removing the particulate matter from the vapor component, by a filter.
- offline sampling to obtain the dry gas analysis of the synthesis gas.
10 - moisture analysis step comprising,
- filtering the synthesis gas by a thimble.
- condensing the moisture in the synthesis gas and analysis, by a plurality of
impinger bottles which are placed in a water bath,
characterized in that, the dry gas analysis step and the moisture analysis step are
15 combined to obtain the complete analysis of the synthesis gas.
Another embodiment of the invention relates to the process, wherein the cooling step
reduces the temperature of the synthesis gas to less the 40 0C.
20 Another embodiment of the invention relates to the process, wherein the synthesis
gas entering the impinger bottle has pressure and temperature of 1.2-1.5 bar and 200-
250 oC respectively.
Another embodiment of the invention relates to the process, wherein the synthesis
25 gas from the impinger bottles enters the rotameter, which is coupled with a
diaphragm type mass flowmeter, for measuring the flow rate of syn gas.
Another embodiment of the invention relates to the system as and when used in
sampling and analysis of the synthesis gas obtained from the gasification reactor.
30
9
The following paragraphs describe the system of the present disclosure with
reference to Figures 1. In the Figure the same element or elements which have same
functions are indicated by the same reference signs.
5 The terms such as upward, downward, vertical, horizontal, lower and upper used in
the description are referred with respect to particular orientation of the system as
shown in the figures of the present disclosure. Hence, such words should not be
construed as limitation to the present disclosure, as the same may be varied
depending on the orientation of the system.
10
Figure 1 shows the location of syn gas sampling points in fluidized bed coal gasifier
plant. The raw syn gas (1) is the first location of sampling having conditions of 280 –
350 0C & pressure of 20 -30 bar. Water scrubbing syn gas outlet (2) is the second
location of sampling having conditions of 100 0C – 150 0C and pressure of 20 bar –
15 30 bar. HCN/COS hydrolysis reactor inlet (3) is the third location of sampling
having temperature of 180 0C – 200 0C & pressure of 20 bar-30 barand HCN/COS
hydrolysis reactor outlet (4) is the fourth hot sampling location having temperature
of 200 0C -220 0C & pressure of 20- 30 bar.
There are total four locations in the plant which needs hot syn gas sampling. All four
20 of these streams are connected to syn gas sampling system at nozzle (5), nozzle (6),
nozzle (7) & nozzle (8) in Figure 1.
Figure 1 shows the syn gas from one of these locations at a time passes through
pressure reducing valve (9) which reduces the pressure of syn gas from 30 bar to 2
bar and then controlled syn gas using needle valve (10) is sent for cooling coiled type
exchanger (11) which reduces the gas temperature to 40 0
25 C using cooling water inlet
(12) at temperature of 33 0C which exits (13) at 44 0C. Syn gas at 40 0C and 2 bar
pressure is sent in a controlled way using needle valve (14) and flow is monitored
through a wet gas flow meter (15) to vapor-Liquid separator (16). Vapor –Liquid
separator separates vapor and liquid from their respective nozzles (17) & nozzle (18)
30 respectively. Vapor flow rate is monitored in vapor flow meter (19).
10
Vapor line (20) has two divisions one line (21) going to filter (22) which removes the
particulate matter in syn gas and then sample bomb (23) for analysis and another by
pass line (24) directly going to flare. The purpose of bypass line (24) is to ensure
purging of sample bomb as well as extraction of sample bomb from the system.
5
The Moisture measurement sampling system is described as below:
Figure 2 illustrates a schematic view of moisture sampling system of raw syn gas
The raw syngas coming out of the gasifier at 280 oC -300 oC and at 20-30 bar
pressure enters the sampling point (29) mentioned in Figure 2. It then enters the inlet
10 of the thimble (30) which is present to filter the SPM present in raw syngas and to
measure the SPM carried with the syngas. The upstream and downstream of the
thimble has got 2 vent points (32 & 33) for venting syngas to safe location in the
event of the thimble getting choked or requiring maintenance during operation. After
the thimble, the syngas enters the inlet of the 2 needle valves in series (31). The
15 needle valves reduce the pressure of the syngas from 20-30 bar to 1.2 to 1.5 bar and
also regulates the flow of the syngas to 10-50 Nm3
/hr. The pressure and temperature
of the syngas entering the impinge bottle is monitored with the pressure gauge and
temperature gauge (34) present at the inlet which need to be maintained at 1.2-1.5
bar and 200-250 oC respectively. A set of 6 impinger bottles (35) filled with distilled
20 water immersed in 2 water baths (3 impinger bottles in each bath (36 &37)) are
present for condensing the moisture contained in the hot syngas. The first bottle
contains 150 ml of distilled water and the rest of the bottles contain 100 ml of
distilled water. The weights of the impinger bottles filled with distilled water is
measured at the start of the experiment. The water baths are filled with cold water for
maintaining the temperature of the impinger bottles between 25-40 o
25 C. After the
syngas passes through the impinger bottles, it enters the rotameter which is coupled
with a diaphragm type mass flowmeter (38). The rotameter measures the flow rate of
the syngas which is adjusted by the needle valves (31) present upstream of the
system. The diaphragm flow meter measures the total volumetric flow of syngas
(Nm3
30 ) flowing through the system. After that the syngas is vented to flare (40) after
11
measuring the pressure and temperature of the syngas at the exit of the impinger
system using the pressure gauge and temperature gauge (39).
The system operates for 3-4 hours after steady state is reached and the total weight of
all the impinger bottles is measured after the experiment. The difference in weight of
5 the impinger bottles before and after the sampling gives the total amount of moisture
collected from the syngas. This difference divided by the total amount of syngas
flowing through the system gives the amount of moisture in Kg present in per Nm3
of syngas.
The above sampling technique is a very effective and accurate method for measuring
10 the moisture present in syngas.
Analysis method for design of gasifier and downstream systems:
Before taking any sample, sample bomb (23) is purged with the gas which is to be
analyzed. After that, 10 minutes time is taken for collection of sample in sample
15 bomb (23). At t = 0, wet flow meter (15) and vapor flow meter (20) are noted and at
a specific time (sufficient to get a sample- t1) again wet flow meter (15) and vapor
flow meter (20) are noted. During collection time of sample (t1), vapor liquid
separator (16) drain valve (25) remains closed. After specific time t1, sample bomb is
isolated using isolation valve (26) & isolation valve (27) and bypass valve (28) is
20 opened at this stage. After that sample bomb (which is a high pressure cylindrical
vessel) is taken for sample analysis. In laboratory sample bomb is heated at 150 0C to
ensure sample remains dry to inject in gas chromatograph. Gas chromatography
gives the syn gas components analysis. The moisture of raw syn gas is not known at
this stage. A part of syn gas is routed through another sampling system which is
25 “moisture measurement sampling system” as described in Fig. 2 to evaluate the
moisture. The final gas composition is evaluated from combining gas chromatograph
evaluated syn gas composition with measured moisture from sampling system.
This quantity of condensed water is added with the final gas analysis from gas
30 chromatograph for complete analysis of syn gas. After getting the overall gas
12
composition, one can calculate the syn gas flow from the main gasifier system by
balancing nitrogen in the feed and nitrogen in the product syn gas (as N2 is a inert) as
this is a challenge as the flow meters in gasifier unit gets choke due to presence of lot
of dust content. So, this system can calculate overall gasifier performance.
5
In one embodiment the system of the present disclosure comprise
a. Sample cooler
b. Vapor-Liquid separator
c. Filter for particulate removal
10 d. Offline sampling arrangement
In another embodiment the gas is toxic syngas produced from gasifier. The syngas is
at pressure of 20 bar – 30 bar and temperature of 280 0C – 350 0C.
In another embodiment, the syngas containing high moisture content upto60 % by -
mol at 280 0C – 350 0
15 C.
Analysis of syngas from system of the present disclosure is used for evaluation of
syngas flow which is a hard to get in fluidized bed coal gasifier with flow meters.
20 In an particular embodiment of the present invention the syngas from one of these
locations at a time passes through pressure reducing valve (9) which reduces the
pressure of syngas from 30 bar to 2 bar and then controlled syngas using needle
valve (10) is sent for cooling coiled type exchanger (11) which reduces the gas
temperature to 40 0C using cooling water inlet (12) at temperature of 33 0C which
exits (13) at 44 0C. Syngas at 40 0
25 C and 2 bar pressure is sent in a controlled way
using needle valve (14) and flow is monitored through a wet gas flow meter (15) to
vapor-Liquid separator (16). Vapor –Liquid separator separates vapor and liquid
from their respective nozzles (17) & nozzle (18) respectively. Vapor flow rate is
monitored in vapor flow meter (19).
30
13
The invention itself, together with further features and attended advantages, will
become apparent from consideration of the following detailed description, taken in
conjunction with the accompanying drawings. One or more embodiments of the
present invention are now described, by way of example only wherein like reference
5 numerals represent like elements and in which:
EXAMPLES
There are many variations and combinations that can be made based on this
disclosure. The following examples and embodiments are given as illustration
10 purposes only that should not be used as limit to the invention.
Example 1:
The sampling experiment according to the invention was carried out with synthesis
gas obtained form Indian coals in oxy-blown conditions which requires much higher
15 amount of steam as feed gas (4 to 5 times as compared to air blown or combined
cycle gasification). This is compared with the sampling system of US 7,849,754 B2
(cited in the background section) which is an air blown or combined cycle
gasification processes.
There is always need for accurate measurement for syn gas when high amount of
20 moisture is present. The sampling system of the present invention is placed at the
pilot plant and the following experimental data was obtained in overall analysis of
syn gas composition as well as syn gas flow rate.
In fluidized bed coal gasification pilot pant experiments, following are the inputs to
25 the gasifier;
Table 1: Feed to gasifier
S.no. Feed Flow Rates (Kg/h)
1. Coal 40-60
2. Steam 70-105
14
3. O2 20-31.5
4. Purge N2 30-45
In the above table, the coal used in the experiment is Indian coal having ash content
of around 29 % -31 % which is an inert and do not take part in any reaction. The
mass flow rate going into the gasifier on ash free basis is in the range of 148 Kg/h to
5 225 Kg/h as per Table 1.
Above reactants are fed into the gasifier which reacts into the gasifier resulting in the
formation of syn gas. The syn gas in the downstream of the gasifier is passed in the
series of unit operations in Figure 1 to get dry gas composition from gas
10 chromatograph. The moisture was obtained from the unit operations as per Figure 2
(Moisture measurement sampling system). After getting dry gas composition and
moisture; complete gas analysis is known. Hence, syn gas flow rate is obtained using
N2 balance between inlet and outlet of gasifier using syn gas composition.
The obtained data is as below:
15
Table 2: Dry synthesis gas composition obtained from system of figure 1 (syn gas
analysis system).
S.o. Synthesis gas components Mol (%)
1 CO 9.0-9.75
2 CO2 21.0-22.90
3 H2 17.2-18.5
4 CH4 1.2-2.0
5 N2 47.0-48.50
6 O2 0.80-0.85
20 The moisture (%) are obtained from the moisture measurement sampling system of
of figure 2 . The moisture (%) obtained is tabulated below.
15
Table 3: Moisture measured from figure 2
S.no. Syn gas components Mol (%)
1. H2O 55-60
The dry syn gas composition and the moisture of the syn gas, obtained from the
systems of the present invention (figure 1 and figure 2) are combined to obtain the
5 complete synthesis gas composition. The overall gas composition obtained are
tabulated below.
Table 4: Overall gas composition (Combining dry and moisture analysis of syn gas)
S.no. Syn gas components Mol (%)
1 CO 3.7-4.2
2 CO2 9.0-10.3
3 H2 7.1-8.0
4 CH4 0.8-0.9
5 N2 18.9-21.2
6 O2 0.3-0.35
7 H2O 55-60
10
The total syn gas flow rate and the unconverted carbon, calculated by the gas
composition analysis is tabulated below.
Table 5: Total Synthesis gas flow rate
S.no. Item Mass flow rate (Kg/h)
1 Syn gas calculated from gas analysis
through N2 (inert balance)
132 - 198
2 Unconverted carbon from gas analysis 10-17
15 Input mass fed to gasifier as per Table 1 = 148 kg/h – 225 kg/h (ash free basis)
Output mass as evaluated from syn gas composition (excluding ash) from Table 5=
142 kg/h – 215 kg/h.
16
The material balance in the experiments and the sampling systems is in the range of
4.0% -4.5 % which is based on the gas compositions measured in the two of
sampling systems as per Fig. 1 & Fig. 2. This shows that the sampling system of the
invention can measure even the high moisture and it is more accurate.
5
The air blown or combined cycle gasification processes whose sampling systems are
cited in background section (US 7,849,754 B2) are used as comparative example 1.
In the example 1, the sampling system and the gasification process are changed to
that of US 7,849,754 B2. The sampling system of the comparative example 1 does
10 not show moisture content at all. The prior Arts don’t show any such case where
high moisture is present in syn gas, which is utilized in the FT liquids, Methanol
synthesis etc.
The sampling system of the present invention can detect high moisture along with
15 other components accurately.
ADVANTAGES
The syngas sampling system of the present disclosure provides the following
advantages:
20 • Even high amount of moisture sys gas stream can be sampled;
• No issue of the dilution;
• Economical process;
• Very less sample stream is enough to carry out the process and system
While preferred aspects and example configurations have been shown and described,
25 it is to be understood that various further modifications and additional configurations
will be apparent to those skilled in the art. It is intended that the specific
embodiments and configurations herein disclosed are illustrative of the preferred
nature of the invention, and should not be interpreted as limitations on the scope of
the invention.
30
17
LIST OF NUMERALS
Numeral Reference
1 Raw syngas sampling point
2 Water scrubbing syngas outlet
3 HCN/COS hydrolysis reactor inlet
4 HCN/COS hydrolysis reactor outlet (4)
5 Connecting nozzle of raw syngas to sampling system
6 Connecting nozzle of water scrubbing syngas outlet to
sampling system
7 Connecting nozzle of HCN/COS hydrolysis reactor
syngas inlet to sampling system
8 Connecting nozzle of HCN/COS hydrolysis reactor
syngas outlet to sampling system
9 Pressure reducing valve
10 Needle valve
11 Coiled type exchanger
12 Cooling water inlet
13 Cooling water outlet
14 Needle valve
15 Flow meter
16 Vapor-Liquid separator (V-L separator)
17 Vapor-Liquid separator vapor nozzle
18 Vapor-Liquid separator liquid nozzle
19 Vapor flow meter
20 Vapor line from V-L separator
21 Vapor line going to filter
22 Filter
23 Sample Bomb
24 By pass line
25 Drain valve
18
26 Isolation valve of sample bomb
27 Isolation valve of sample bomb
28 By pass valve
29 Sampling point for moisture
30 Thimble
31 Needle valves
32 Vent valves
33 Vent valves
34 Field instruments (PG & TG)
35 Impinger bottles
36 Water bath-I
37 Water bath-II
38 Mass flow meter
39 Field instruments (PG & TG)
40 Vent valve

We Claim:

1. A system for a sampling and analysis of synthesis gas comprising, a dry gas
sampler and a moisture sampler,
5 wherein the dry gas sampler comprises,
- a sample cooler, for cooling the synthesis gas;
- a vapor-liquid separator, for separating the vapor and liquid component of the
synthesis gas
- a filter for particulate removal from the vapor component of the synthesis
10 gas,
- an offline sampling arrangement to obtain the dry gas analysis of the
synthesis gas
the moisture sampler comprises,
- a thimble, for filtering the synthesis gas
15 - a plurality of impinger bottles which are placed in a water bath for
condensing the moisture in the synthesis gas.
characterized in that, the dry gas sampler analysis and the moisture sampler
analysis are combined to obtain the sampling and complete analysis of the synthesis
gas.
20
2. The system as claimed in claim 1, wherein the offline sampling arrangement of the
dry sampler include a sample bomb and a gas chromatography.
3. The system as claimed in claim 1, wherein the synthesis gas for dry sampler and
25 moisture sampler are taken online from same point and sample source of
gasification.
4. The system as claimed in claims 1 or 3, wherein the syngas comprises high
moisture content up to - 60 mol % at 280 0C – 350 0C.
30
20
5. The system as claimed in claim 1, wherein the impinger bottles are at least six in
number and the moisture in the synthesis gas is calculated from gravimetric analysis
6. The system as claimed in claims 1 or 5, wherein the water baths are filled with
cold water for maintaining the temperature of the impinger bottles between 25 o
5 C -40
oC.
7. The system as claimed in one of claims 1 to 6, wherein the analyzed synthesis gas
is sent to flare for disposal.
10
8. The system as claimed in one of claims 1 to 7, wherein the synthesis gas is
collected from at least four locations in the plant which needs hot synthesis gas
sampling.
15 9. A process for sampling and analysis of synthesis gas comprising steps of,
- dry gas sampling and analysis step comprising,
- cooling the synthesis gas in a sample cooler,
- separating the vapor and liquid component of the synthesis gas, by a vaporliquid separator.
20 - removing the particulate matter from the vapor component, by a filter.
- offline sampling to obtain the dry gas analysis of the synthesis gas.
- moisture analysis step comprising,
- filtering the synthesis gas by a thimble.
- condensing the moisture in the synthesis gas and analysis, by a plurality of
25 impinger bottles which are placed in a water bath,
characterized in that, the dry gas analysis step and the moisture analysis step are
combined to obtain the complete analysis of the synthesis gas.
10. The process as claimed in claim 9, wherein the cooling step reduces the
temperature of the synthesis gas to less the 40 0
30 C.
21
11. The process as claimed in claim 9 or 10, wherein the synthesis gas entering the
impinger bottle has pressure and temperature of 1.2-1.5 bar and 200-250 oC
respectively.
5 12. The process as claimed in claim 11, wherein the synthesis gas from the impinger
bottles enters the rotameter, which is coupled with a diaphragm type mass
flowmeter, for measuring the flow rate of syn gas.
13. The system as claimed in claims 1 to 8, as and when used in sampling and
10 analysis of the synthesis gas obtained from the gasification reactor.