CN109941758B - Pulverized coal pressurized gasification methanol device CO 2 Automatic recovery adjusting purified gas system - Google Patents
Pulverized coal pressurized gasification methanol device CO 2 Automatic recovery adjusting purified gas system Download PDFInfo
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- CN109941758B CN109941758B CN201910352930.6A CN201910352930A CN109941758B CN 109941758 B CN109941758 B CN 109941758B CN 201910352930 A CN201910352930 A CN 201910352930A CN 109941758 B CN109941758 B CN 109941758B
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 239000003245 coal Substances 0.000 title claims abstract description 36
- 238000002309 gasification Methods 0.000 title claims abstract description 24
- 238000011084 recovery Methods 0.000 title description 7
- 239000007789 gas Substances 0.000 claims abstract description 215
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 77
- 230000001105 regulatory effect Effects 0.000 claims abstract description 50
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 43
- 229910000037 hydrogen sulfide Inorganic materials 0.000 claims abstract description 17
- 238000003786 synthesis reaction Methods 0.000 claims abstract description 16
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 15
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000010926 purge Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 78
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 12
- 230000008901 benefit Effects 0.000 abstract description 9
- 238000005406 washing Methods 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052799 carbon Inorganic materials 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 229910001873 dinitrogen Inorganic materials 0.000 abstract 1
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model provides a fine coal pressurization gasification methyl alcohol device CO2 retrieves automatically regulated purge gas system, carries out make full use of after retrieving pressurization with low-pressure high concentration CO2 that low-methyl hydrogen sulfide concentration tower and low-methyl carbon dioxide analysis tower produced through sprayer and compressor, can effectively reduce the carbon emission, can supply fine coal conveying system simultaneously and use the not enough of high-pressure CO2, avoids nitrogen gas to get into the system and causes the emission loss of effective gas, economic benefits is considerable. The recovered CO2 is supplemented to fresh gas of the methanol synthesis system to adjust gas components, so that the efficiency and quality of the methanol synthesis reaction are ensured, meanwhile, the low-temperature methanol washing operation is liberated, the loss and risk caused by the replacement of methanol liquid are avoided, and the comprehensive benefit is remarkable. The methanol displacement is reduced, the manufacturing cost is reduced, and the carbon emission is reduced. The method has the advantages of simple flow, safe and reliable operation, easy realization of automatic control, low process energy consumption, and utilization, popularization and application.
Description
Technical Field
The invention relates to the field of pulverized coal gasification methanol synthesis, in particular to an automatic CO2 recovery regulation and purification gas system of a pulverized coal pressurized gasification methanol device.
Background
The purification technology in the pulverized coal pressurized gasification methanol synthesis device currently generally adopts a low-temperature methanol washing technology, the low-temperature methanol washing is a typical physical absorption process, and the aim of purifying gas is achieved by absorbing most of H2S and CO2 in raw material gas at low temperature and high pressure by utilizing different solubilities of various gases in methanol. The methanol synthesis process requires low-temperature methanol washing to thoroughly absorb H2S and simultaneously needs to retain a certain amount of CO2 (3-4%), one-time operation conditions are harsh, the operation pressure of the pulverized coal pressurized gasification process is about 2.0MPa lower than that of the coal water slurry gasification process, the operation under 3.0MPa has higher requirements on low-grade methanol, and particularly when the quality of methanol circulating liquid is reduced, the circulating quantity is required to be increased to thoroughly purify H2S, so that the CO2 content cannot be ensured, the CO2 content in fresh gas for synthesizing methanol is lower, the methanol synthesis rate is influenced, and the quality of crude methanol is reduced. From the current known situation, the low-methanol operation in most pulverized coal pressurized gasification methanol production devices faces the problem that the methanol liquid needs to be replaced regularly in order to ensure that the process operation reaches the standard, and the methanol waste liquid takeaway of hundreds of tons per month causes great economic loss and also has great safety risks.
In the pulverized coal pressurized gasification process, a large amount of CO2 is required for pulverized coal transportation, a part of the CO2 is emptied, and a part of the CO2 enters the system, when the system runs at full load, the CO2 product gas subjected to low-methyl flash evaporation and the gasified pulverized coal transportation amount are basically balanced, but when the system is reduced to below 90 percent of load, the amount of produced nitrogen is basically unchanged, so that the pulverized coal transportation amount is reduced, part of nitrogen must be supplemented, but after the supplemented nitrogen enters the system, the content of methanol synthesis inert gas is increased, the effective air waste loss is caused by increasing the emptying of the system, and the lower the system load is, the larger the nitrogen supplementing amount is, and the more obvious the emptying waste is. The concentration of CO2 gas flashed at the top of the H2S concentration tower of the low-grade system is high (the concentration is higher than that of the existing product gas), but the low pressure (0.05 MPa) cannot be directly utilized and can only be emptied. The waste of invalid emission of CO2 gas is avoided, the unbalance of the CO2 consumption is avoided, and the contradiction is outstanding.
Disclosure of Invention
In order to overcome the defects of the technology, the invention provides the CO2 recycling automatic regulating and purifying gas system of the pulverized coal pressurizing and gasifying methanol device, which is used for recycling high-concentration low-pressure CO2 gas discharged by a low-pressure methanol system, ensuring the consumption of high-pressure CO2 product gas for pulverized coal conveying, simultaneously automatically regulating the CO2 content in fresh gas synthesized by methanol, releasing low-temperature methanol washing operation and reducing the waste of effective gas and the loss of methanol replacement.
The technical scheme adopted for overcoming the technical problems is as follows:
a CO2 recovery automatically-regulated purge gas system for a pulverized coal pressurized gasification methanol plant, comprising:
one end of the gas transmission pipeline I is connected with the low-methyl hydrogen sulfide concentration tower 2The other end of the outlet is connected with the emptying cylinder 8, a pressure valve I is arranged on the gas transmission pipeline I, one end of the regulating loop I is connected with the gas transmission pipeline I adjacent to the low-methyl hydrogen sulfide concentration tower, and the other end of the regulating loop I is connected with the gas inlet end of the pressure valve I;
the ejector is sealed at the periphery, a cavity is formed in the ejector, a high-pressure air inlet connected with the cavity is formed in the top of the ejector, a low-pressure air inlet connected with the cavity is formed in the middle of the ejector, and an air outlet connected with the cavity is formed in the bottom of the ejector;
one end of the low-pressure pipeline is connected with the gas transmission pipeline I, and the other end of the low-pressure pipeline is connected with the low-pressure gas inlet;
one end of the gas pipeline II is connected with the low-methyl carbon dioxide analysis towerThe other end of the outlet is connected with an air inlet of the compressor, and an air outlet of a first-stage compression end of the compressor is connected with a high-pressure air inlet through a high-pressure pipeline;
one end of the gas transmission pipeline III is connected with a gas outlet of a third-fourth-stage compression end of the compressor, and the other end of the gas transmission pipeline III is connected with a gasified coal powder conveying system;
one end of the air conveying pipeline IV is connected with the air conveying pipeline III, the other end of the air conveying pipeline IV is connected with the emptying cylinder, a pressure valve IV is arranged on the air conveying pipeline IV, one end of the regulating loop II is connected with the air conveying pipeline III, and the other end of the regulating loop II is connected with an air inlet of the pressure valve IV;
one end of the gas transmission pipeline VI is connected with a purified gas outlet of the low-grade methane system, and the other end of the gas transmission pipeline VI is connected with a fresh gas inlet of the methanol synthesis system; and
the gas transmission pipeline V is characterized in that one end of the gas transmission pipeline V is connected with the gas transmission pipeline III, the other end of the gas transmission pipeline V is connected with the gas transmission pipeline VI, the pressure valve VI is arranged on the gas transmission pipeline V, one end of the regulating loop III is connected with the gas inlet end of the pressure valve VI, and the other end of the regulating loop III is connected with the gas transmission pipeline VI through the carbon dioxide concentration analyzer.
For convenient maintenance, still including setting up stop valve I and stop valve II on gas-supply pipeline I, stop valve I and stop valve II are located the both sides of pressure valve I respectively.
In order to facilitate pressure adjustment, a stop valve III is arranged on the low-pressure pipeline, and a pressure valve II is arranged on the high-pressure pipeline.
In order to facilitate the control of the flow, the top of the injector is provided with a flow valve connected to the air inlet.
In order to prevent the gas from flowing back, a check valve I is arranged between the gas outlet of the ejector and the gas transmission pipeline II.
In order to facilitate the adjustment of pressure, the gas transmission pipeline II is provided with a pressure valve III.
In order to facilitate the adjustment of the pressure, a pressure valve V is arranged on the gas transmission pipeline III.
For convenient maintenance, the hydraulic control system further comprises a stop valve IV and a stop valve V which are arranged on the gas pipeline IV, and the stop valve I and the stop valve V are respectively positioned on two sides of the pressure valve I.
For convenient maintenance, the device also comprises a stop valve VI and a stop valve VII which are arranged on the gas pipeline V, wherein the stop valve VI and the stop valve VII are respectively positioned at two sides of the pressure valve VI, and a check valve III is arranged on the gas pipeline V.
In order to prevent the gas from flowing back, a check valve II is arranged on the gas transmission pipeline III and between the third-fourth stage compression end of the compressor and the pressure valve V.
The beneficial effects of the invention are as follows: the low-pressure high-concentration CO2 generated by the low-methyl hydrogen sulfide concentration tower and the low-methyl carbon dioxide analysis tower is recycled and pressurized through the ejector and the compressor and then fully utilized, so that the carbon emission can be effectively reduced, the defect of high-pressure CO2 for the pulverized coal conveying system can be supplemented, the emission loss of effective gas caused by nitrogen entering the system is avoided, and the economic benefit is considerable. The recovered CO2 is supplemented to fresh gas of the methanol synthesis system to adjust gas components, so that the efficiency and quality of the methanol synthesis reaction are ensured, meanwhile, the low-temperature methanol washing operation is liberated, the loss and risk caused by the replacement of methanol liquid are avoided, and the comprehensive benefit is remarkable. The methanol displacement is reduced, the manufacturing cost is reduced, and the carbon emission is reduced. The method has the advantages of simple flow, safe and reliable operation, easy realization of automatic control, low process energy consumption, and utilization, popularization and application.
Drawings
FIG. 1 is a schematic diagram of a system architecture of the present invention;
FIG. 2 is a schematic diagram of an injector according to the present invention;
in the figure, the injector 2, the low-grade hydrogen sulfide concentration column 3, the gas transmission pipeline I4, the regulating circuit I5, the stop valve I6, the pressure valve I7, the stop valve II 8, the emptying tube 9, the low-pressure pipeline 10, the stop valve III 11, the high-pressure pipeline 12, the pressure valve II 13, the compressor 14, the second-stage compression end 15, the third-grade compression end 16, the gas transmission pipeline II 17, the check valve I18, the low-grade carbon dioxide analysis column 19, the pressure valve III 20, the gas transmission pipeline III 21, the gas transmission pipeline IV 22, the pressure valve IV 23, the regulating circuit II 24, the stop valve IV 25, the stop valve V26, the check valve II 27, the pressure valve V28, the gasification pulverized coal transmission system 29, the regulating circuit V30, the stop valve VI 32, the pressure valve VI 33, the check valve III 34, the carbon dioxide concentration analyzer 35, the low-grade carbon dioxide analysis system 36, the gas transmission pipeline VI 37, the methanol synthesis system 38, the stop valve VII 101, the low-pressure gas inlet 102, the high-pressure inlet 103 and the gas outlet 104.
Detailed Description
The invention is further described with reference to fig. 1 and 2.
The method comprises the following steps ofCO2 recovery automatically regulated purge gas system of pulverized coal pressurization gasification methyl alcohol device includes: one end of the gas pipeline I3 is connected with the low-methyl hydrogen sulfide concentration tower 2The other end of the outlet is connected with a vent cylinder 8, a pressure valve I6 is arranged on the gas transmission pipeline I3, one end of a regulating loop I4 is connected with the gas transmission pipeline I3 adjacent to the low-methyl hydrogen sulfide concentration tower 2, and the other end of the regulating loop I is connected with the gas inlet end of the pressure valve I6; the ejector 1 is sealed at the periphery, a cavity is arranged in the ejector 1, a high-pressure air inlet 102 connected with the cavity is arranged at the top of the ejector 1, a low-pressure air inlet 101 connected with the cavity is arranged at the middle part of the ejector 1, and an air outlet 104 connected with the cavity is arranged at the bottom of the ejector 1; a low pressure pipeline 9, one end of which is connected to the gas transmission pipeline I3, and the other end of which is connected to the low pressure gas inlet 101; one end of the gas pipeline II 16 is connected with the +.f of the low-methyl carbon dioxide analysis tower 18>An outlet, the other end of which is connected with an air inlet of the compressor 13, and an air outlet of a secondary compression end 14 of the compressor 13 is connected with a high-pressure air inlet 102 through a high-pressure pipeline 11; one end of the gas transmission pipeline III 20 is connected with the gas outlet of the third-fourth-stage compression end 15 of the compressor 13, and the other end of the gas transmission pipeline III is connected with the gasified pulverized coal conveying system 28; one end of the gas transmission pipeline IV 21 is connected with the gas transmission pipeline III 20, the other end of the gas transmission pipeline IV is connected with the emptying cylinder 8, the gas transmission pipeline IV 21 is provided with a pressure valve IV 22, one end of the regulating loop II 23 is connected with the gas transmission pipeline III 20, and the other end of the regulating loop II is connected with a gas inlet of the pressure valve IV 22; one end of a gas transmission pipeline VI 36 is connected with a purified gas outlet of the low-grade methane system 35, and the other end of the gas transmission pipeline VI is connected with a fresh gas inlet of the methanol synthesis system 37; and a gas pipeline V29, one end of which is connected with the gas pipeline III 20, the other end of which is connected with the gas pipeline VI 36, the gas pipeline V29 is provided with a pressure valve VI 32, the pressure valve VI 32 is arranged on the pressure valve VI 32, one end of the regulating circuit III 30 is connected with the gas inlet end of the pressure valve VI 32, and the other end of the regulating circuit III is connected with the gas pipeline VI 36 through a carbon dioxide concentration analyzer 34. General purpose medicineThe pressure valve I6 regulates the pressure, and the low pressure generated by the low-methyl hydrogen sulfide concentration tower 2 is +.>One path of gas is discharged through the gas transmission pipeline I3 to the discharging cylinder 8, and a part of the gas is at low pressureThe gas is fed into the ejector 1 via the low-pressure line 9 and is produced in the low-carbon dioxide analysis column 18>The gas is delivered to the compressor 13 by a gas delivery pipeline II 16 after the pressure of the gas is regulated by a pressure valve III 19, and the gas is compressed by a first-stage compression end 14 of the compressor 13>The gas is regulated in pressure by a pressure valve II 12 through a high-pressure pipeline 11 and then enters the injector 1 for high pressure +.>The gas drives the low pressure of the low pressure pipeline 9 input +.>The gas flows into a gas transmission pipeline II 16 from a gas outlet 104 of the ejector 1 and then enters a compressor 13 again for compression, so that the gas is effectively discharged from the low-methyl hydrogen sulfide concentration tower 2>Gas recovery, make-up system using high pressure +.>Deficiency of gas product gas. High pressure formed by compression through the tri-four compression end 15 of the compressor 13>The gas is conveyed to the gasification pulverized coal conveying system 28 for supplying through the gas conveying pipeline III 20The use thereof is that if the gas pressure in the gas line III 20 is higher than the set pressure of the pressure valve IV 22, high pressure +.>The gas flows into a gas transmission pipeline IV 21 through a regulating loop II 23 and finally is discharged through a discharging cylinder 8, and the other path of gas is high-pressure +.>The gas is regulated by a pressure valve VI 32, enters a gas pipeline VI 36, is mixed with a purifier generated by a low-pressure methane system 35, and enters a methanol synthesis system 37 for use. The mixed gas in the gas transmission pipeline VI 36 is transmitted to the carbon dioxide concentration analyzer 34 for on-line analysis by the regulating loop III 30>Gas content, if->The gas content does not reach the standard, and is regulated by a pressure valve VI 32>And (3) gas to enable the gas to meet the requirements. The low-pressure high-concentration CO2 generated by the low-methyl hydrogen sulfide concentration tower 2 and the low-methyl carbon dioxide analysis tower 18 is recycled and pressurized through the ejector 1 and the compressor 13 and then fully utilized, so that carbon emission can be effectively reduced, the defect of high-pressure CO2 for a pulverized coal conveying system can be supplemented, the emission loss of effective gas caused by nitrogen entering the system is avoided, and the economic benefit is considerable. The recovered CO2 is supplemented to fresh gas of the methanol synthesis system 37 to adjust gas components, so that the efficiency and quality of the methanol synthesis reaction are ensured, meanwhile, the low-temperature methanol washing operation is liberated, the loss and risk caused by the replacement of methanol liquid are avoided, and the comprehensive benefit is remarkable. The replacement amount of methanol can be reduced by about 200 tons per month after transformation, the cost can be saved by more than 200 ten thousand yuan per year, and the carbon emission is reduced by 8 ten thousand tons. The method has the advantages of simple flow, safe and reliable operation, easy realization of automatic control, low process energy consumption, and utilization, popularization and application.
Further, the device also comprises a stop valve I5 and a stop valve II 7 which are arranged on the gas pipeline I3, and the stop valve I5 and the stop valve II 7 are respectively positioned on two sides of the pressure valve I6. After closing the stop valve I5 and the stop valve II 7, the gas transmission pipeline I3 and the regulating circuit I4 are connectedThe gas can not enter the emptying cylinder 8, so that the pipeline is convenient to overhaul. After opening the stop valve I5 and the stop valve II 7, the low-methyl hydrogen sulfide concentration tower 2 generates +.>The gas directly enters the emptying cylinder 8 through the gas transmission pipeline I3. Closing the stop valve I5 and opening the stop valve II 7 if +.>The gas is regulated to the set pressure through a pressure valve I6 and then enters a gas transmission pipeline I3.
Further, a shut-off valve III 10 is provided on the low pressure line 9, and a pressure valve II 12 is provided on the high pressure line 11. In the gas-supply line I3 after closing the shut-off valve III 10The gas will not enter the low pressure air inlet 101 of the injector 1, so that the injector 1 can be conveniently overhauled, and the high pressure air inlet 102 of the injection balloon 1 output from the primary compression end 14 of the compressor 13 can be conveniently regulated through the pressure valve II 12>The gas pressure can be adjusted to 2.0MPa.
Preferably, the top of the injector 1 is provided with a flow valve 103 connected to the air inlet 102. The recovery can be regulated by regulating the flow valve 103The amount of gas, the gas outlet of the ejector 1104 pressure is preferably 0.1-0.15Mpa, slightly higher than the compressor inlet pressure, ensuring a low pressure in the low pressure line 9>Normal transport of gas.
Further, a check valve i 17 is disposed between the air outlet 104 of the ejector 1 and the air delivery pipe ii 16. By providing the check valve I17, the gas transmission pipeline II 16 can be preventedThe gas is strung back into the injector 1.
Preferably, the gas transmission pipeline II 16 is provided with a pressure valve III 19. The output of the low-methyl carbon dioxide analysis tower 18 to the gas pipeline II 16 can be regulated by regulating the pressure valve III 19The gas pressure of the gas.
Further, the gas pipe iii 20 is provided with a pressure valve v 27. The pressure valve V27 can conveniently regulate the position of the gasified pulverized coal conveying system 28The gas pressure of the gas.
Further, the hydraulic control system further comprises a stop valve IV 24 and a stop valve V25 which are arranged on the gas pipeline IV 21, and the stop valve I5 and the stop valve V25 are respectively positioned on two sides of the pressure valve I6. After the stop valve IV 24 and the stop valve V25 are closed, the air conveying pipeline IV 21 can be overhauled conveniently. After the stop valves IV 24 and V25 are opened, the high pressure in the gas transmission pipeline III 20 can be directly controlledThe gas is conveyed to the emptying cylinder 8 through the gas conveying pipeline IV 21 for emptying, the stop valve V25 is closed, the stop valve IV 24 is opened, and then the gas is taken as high pressure ++in the gas conveying pipeline III 20>The gas is regulated to the set pressure of the knife through a pressure valve IV 22 and then is sent to a gas transmission pipeline IV 21.
Further, the hydraulic pump further comprises a stop valve VI 31 and a stop valve VII 38 which are arranged on the gas pipeline V29, the stop valve VI 31 and the stop valve VII 38 are respectively positioned at two sides of the pressure valve VI 32, and a check valve III 33 is arranged on the gas pipeline V29. After the stop valve VI 31 and the check valve III 33 are closed, the gas transmission pipeline V29 can be conveniently overhauled, and when the stop valve VI 31 and the check valve III 33 are fully opened, the high pressure in the gas transmission pipeline III 20The gas directly enters the gas transmission pipeline VI 36 through the gas transmission pipeline V29, when the stop valve VI 31 is opened and the stop valve VII 38 is closed, the +.>After the gas is regulated to a proper set pressure by a pressure valve VI 32, the gas is conveyed to a gas conveying pipeline VI 36 through a regulating loop III 30. The check valve III 33 can prevent the gas in the gas transmission pipeline VI 36 from being reversely connected into the gas transmission pipeline III 20.
Preferably, a non-return valve II 26 is arranged on the gas line III 20 between the third-fourth stage compression end 15 of the compressor 13 and the pressure valve V27. By providing a non-return valve II 26, high pressure in the gas line III 20 can be preventedThe gas is reversed and strung into the compressor.
Claims (10)
1. Pulverized coal pressurized gasification methanol device CO 2 Retrieve automatically regulated purge gas system, its characterized in that includes:
one end of a gas transmission pipeline I (3) is connected with the outlet of the low-methyl hydrogen sulfide concentration tower (2), the other end of the gas transmission pipeline I (3) is connected with a vent cylinder (8), a pressure valve I (6) is arranged on the gas transmission pipeline I (3), one end of a regulating loop I (4) is connected with the gas transmission pipeline I (3) adjacent to the low-methyl hydrogen sulfide concentration tower (2), and the other end of the regulating loop I is connected with the gas inlet end of the pressure valve I (6);
the ejector (1) is sealed at the periphery and internally provided with a cavity, the top of the ejector (1) is provided with a high-pressure air inlet (102) connected with the cavity, the middle part of the ejector (1) is provided with a low-pressure air inlet (101) connected with the cavity, and the bottom of the ejector (1) is provided with an air outlet (104) connected with the cavity;
a low-pressure pipeline (9), one end of which is connected with the gas pipeline I (3) and the other end of which is connected with the low-pressure gas inlet (101);
one end of the gas transmission pipeline II (16) is connected with the outlet of the low-methyl carbon dioxide analysis tower (18), the other end of the gas transmission pipeline II is connected with the gas inlet of the compressor (13), and the gas outlet of the first-stage compression end (14) of the compressor (13) is connected with the high-pressure gas inlet (102) through the high-pressure pipeline (11);
one end of the gas transmission pipeline III (20) is connected with a gas outlet of a third-fourth-stage compression end (15) of the compressor (13), and the other end of the gas transmission pipeline III is connected with a gasified pulverized coal conveying system (28);
one end of the gas transmission pipeline IV (21) is connected with the gas transmission pipeline III (20), the other end of the gas transmission pipeline IV is connected with the emptying cylinder (8), the gas transmission pipeline IV (21) is provided with a pressure valve IV (22), one end of the regulating circuit II (23) is connected with the gas transmission pipeline III (20), and the other end of the regulating circuit II is connected with a gas inlet of the pressure valve IV (22);
a gas transmission pipeline VI (36) with one end connected to a purified gas outlet of the low-grade methane system (35) and the other end connected to a fresh gas inlet of the methanol synthesis system (37); and
the gas transmission pipeline V (29), its one end is connected in gas transmission pipeline III (20), and its other end is connected in gas transmission pipeline VI (36), be provided with pressure valve VI (32) on gas transmission pipeline V (29), be provided with pressure valve VI (32) on the pressure valve VI (32), regulation loop III (30) one end is connected in the inlet end of pressure valve VI (32), and its other end is connected in gas transmission pipeline VI (36) through carbon dioxide concentration analyzer (34).
2. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: also comprises a cutting-off part arranged on the gas transmission pipeline I (3)Stop valve I (5) and stop valve II (7), stop valve I (5) and stop valve II (7) are located the both sides of pressure valve I (6) respectively.
3. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: a stop valve III (10) is arranged on the low-pressure pipeline (9), and a pressure valve II (12) is arranged on the high-pressure pipeline (11).
4. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: the top of the ejector (1) is provided with a flow valve (103) connected with the air inlet (102).
5. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: a check valve I (17) is arranged between an air outlet (104) of the ejector (1) and the air transmission pipeline II (16).
6. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: the gas transmission pipeline II (16) is provided with a pressure valve III (19).
7. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: and a pressure valve V (27) is arranged on the gas transmission pipeline III (20).
8. The pulverized coal pressurized gasification methanol plant CO according to claim 2 2 Retrieve automatically regulated purge gas system, its characterized in that: the hydraulic control system further comprises a stop valve IV (24) and a stop valve V (25) which are arranged on the gas pipeline IV (21), and the stop valve I (5) and the stop valve V (25) are respectively positioned on two sides of the pressure valve I (6).
9. According to claim1 the pulverized coal pressurized gasification methanol device CO 2 Retrieve automatically regulated purge gas system, its characterized in that: the device further comprises a stop valve VI (31) and a stop valve VII (38) which are arranged on the gas pipeline V (29), wherein the stop valve VI (31) and the stop valve VII (38) are respectively positioned on two sides of the pressure valve VI (32), and a check valve III (33) is arranged on the gas pipeline V (29).
10. The pulverized coal pressurized gasification methanol plant CO according to claim 1 2 Retrieve automatically regulated purge gas system, its characterized in that: and a check valve II (26) is arranged on the gas transmission pipeline III (20) and positioned between the third-fourth-stage compression end (15) of the compressor (13) and the pressure valve V (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352930.6A CN109941758B (en) | 2019-04-29 | 2019-04-29 | Pulverized coal pressurized gasification methanol device CO 2 Automatic recovery adjusting purified gas system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352930.6A CN109941758B (en) | 2019-04-29 | 2019-04-29 | Pulverized coal pressurized gasification methanol device CO 2 Automatic recovery adjusting purified gas system |
Publications (2)
| Publication Number | Publication Date |
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| CN109941758A CN109941758A (en) | 2019-06-28 |
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