CN112225639A - Methanol purge gas recycling system and process - Google Patents

Methanol purge gas recycling system and process Download PDF

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Publication number
CN112225639A
CN112225639A CN202011203961.4A CN202011203961A CN112225639A CN 112225639 A CN112225639 A CN 112225639A CN 202011203961 A CN202011203961 A CN 202011203961A CN 112225639 A CN112225639 A CN 112225639A
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pipeline
methanol
water
purge gas
methane
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CN202011203961.4A
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刘长伟
周永涛
李峻
佟黎明
常福军
张亮
索贵周
杨金龙
孙汉明
王洋
姬惠
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China Coal Shaanxi Yulin Energy and Chemical Co Ltd
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China Coal Shaanxi Yulin Energy and Chemical Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C07C29/152—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases characterised by the reactor used
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/50—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification
    • C01B3/56—Separation of hydrogen or hydrogen containing gases from gaseous mixtures, e.g. purification by contacting with solids; Regeneration of used solids
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/15—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively
    • C07C29/151—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring by reduction of oxides of carbon exclusively with hydrogen or hydrogen-containing gases
    • C07C29/1516—Multisteps
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C29/00—Preparation of compounds having hydroxy or O-metal groups bound to a carbon atom not belonging to a six-membered aromatic ring
    • C07C29/74—Separation; Purification; Use of additives, e.g. for stabilisation
    • C07C29/76—Separation; Purification; Use of additives, e.g. for stabilisation by physical treatment

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Inorganic Chemistry (AREA)
  • Separation Of Gases By Adsorption (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

The invention discloses a methanol purge gas recycling system, which comprises: the device comprises a purge gas reaction system, a methanol cooling system, a methanol separator, a water washing tower, a pipeline A, a pipeline B and a pipeline C; the purge gas reaction system is connected with a methanol cooling system through a pipeline A, the methanol cooling system is connected with a methanol separator through a pipeline B, and the methanol separator is connected with the water washing tower through a pipeline C. The invention also discloses a methanol purge gas recycling process, the purge gas is subjected to methanol synthesis reaction in a single pass to replace the traditional membrane separation process, a compressor is not required, and the method is compared with the method thatCompared with the traditional membrane separation technology, the pressure loss is small, the reacted gas can be directly supplied outside after high-purity hydrogen is extracted by the pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and CO in the purge gas can be discharged2The methanol is recovered, and the production cost is reduced.

Description

Methanol purge gas recycling system and process
Technical Field
The invention relates to a methanol purge gas recycling system and a methanol purge gas recycling process, and belongs to the technical field of chemical waste gas recycling.
Background
The traditional purge gas recovery of methanol synthesis utilizes membrane separation (or pressure swing adsorption technology) to recover hydrogen, but only part of hydrogen is recovered, wherein CO and CO2 are wasted due to the fact that a torch is used for discharging the hydrogen, the pressure loss of the hydrogen after membrane separation recovery is large, and the hydrogen recovered by pressure swing adsorption can be returned to a synthesis system after a hydrogen compressor is arranged for pressurization.
Disclosure of Invention
The invention aims to provide a methanol purge gas recycling system, and also provides a methanol purge gas recycling process, so that the purge gas can be subjected to a methanol synthesis reaction for a single time to replace the traditional membrane separation process, a compressor is not required, the pressure loss is small compared with the traditional membrane separation process, the reacted gas can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not required, and CO in the purge gas can be recycled、CO2The methanol is recovered, and the production cost is reduced. In order to solve the technical problems, the invention adopts the following technical scheme: a methanol purge gas recycling system comprises a purge gas reaction system, a methanol cooling system, a methanol separator, a water washing tower, a pipeline A, a pipeline B and a pipeline C; the purge gas reaction system is connected with a methanol cooling system through a pipeline A, the methanol cooling system is connected with a methanol separator through a pipeline B, and the methanol separator is connected with the water washing tower through a pipeline C; the purge gas is subjected to methanol synthesis reaction in a single pass to replace the traditional membrane separation process without a compressor, the pressure loss is small compared with the traditional membrane separation technology, the reacted gas can be directly supplied externally after high-purity hydrogen is extracted by the pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and CO in the purge gas can be used2The methanol is recovered, and the production cost is reduced.
The methanol purge gas recycling system comprises an intermediate heat exchanger, a purge gas reactor and a steam drum device, wherein the top of the intermediate heat exchanger is connected with one end of a pipeline A, the left side and the right side of the intermediate heat exchanger are provided with a pipeline D and a pipeline E, one end of the pipeline E is connected with the intermediate heat exchanger, the other end of the pipeline E is connected with the top of the purge gas reactor, the bottom of the purge gas reactor is provided with a pipeline F, one end of the pipeline F is connected with the bottom of the purge gas reactor, the other end of the pipeline F is connected with the bottom of the intermediate heat exchanger, one side of the purge gas reactor is provided with a pipeline G and a pipeline H, one end of the pipeline G is connected with one side of the purge gas reactor, the other end of the pipeline G is connected with the bottom of the steam drum device, one end of the pipeline H is connected with one side of the purge gas reactor, and the other end of the pipeline H is, the top of the steam drum equipment is provided with a pipeline I; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out.
The utility model provides an aforementioned methyl alcohol relaxs gassing recycle system, methyl alcohol cooling system includes methyl alcohol air cooler, methyl alcohol water cooler and J pipeline, methyl alcohol air cooler is connected with the other end of A pipeline, and methyl alcohol air cooler passes through the J pipeline and is connected with methyl alcohol water cooler, methyl alcohol water cooler is connected with the one end of B pipeline, and methyl alcohol water cooler's bottom is provided with the inlet channel, and methyl alcohol water cooler's bottom is provided with the return water pipeline.
In the foregoing methanol purge gas recycling system, a fan is arranged above the methanol air cooler, and a motor is arranged on the fan.
In the foregoing methanol purge gas recycling system, a K pipeline is disposed at the bottom of the methanol separator.
The recovery and utilization system for the purge gas of methanol is characterized in that an L pipeline is arranged at the top of the water washing tower, one end of the L pipeline is connected with the top of the water washing tower, a pressure swing adsorption device is arranged at the other end of the L pipeline, an M pipeline is arranged at the bottom of the water washing tower, an N pipeline is arranged on one side of the water washing tower, one end of the N pipeline is connected with one side of the water washing tower, and a flash tank is arranged at the other end of the N pipeline.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the purge gas of 7.4-7.6MPa to an intermediate heat exchanger through a D pipeline, and heating through the intermediate heat exchanger; the heated purge gas is conveyed from the intermediate heat exchanger to the tube pass of the purge gas reactor through an E pipeline to react with a synthetic catalyst and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of boiler water of the purge gas reactor2Conveying the mixed gas of nitrogen, methane and water to drum equipment for disposal through a G pipeline, and generating byproduct steam through an I pipeline; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to an intermediate heat exchanger through an F pipeline for primary cooling;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler through a pipeline A for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler through a J pipeline for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator through a pipeline B for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5% crude methanol flows out through K pipeline and is stored;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to a water washing tower through a C pipeline, DW desalted water and 55% of H are added into the water washing tower through an N pipeline2Reacting with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower to form 55% of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline and is sent to a pressure swing adsorption device for processing to generate 99.99 percent of high-purity hydrogen, and 15 percent of methanol solution is sent to a flash tank through an M pipeline.
In the foregoing methanol purge gas recycling process, in the step S1, the temperature of heating by the intermediate heat exchanger is 220-240 ℃, the heating time is 20-25S, the temperature of first cooling of the reacted gas by the intermediate heat exchanger is 80-95 ℃, and the time of first cooling is 19-23S.
In the foregoing methanol purge gas recycling process, in the step S2, the methanol, CO, and H after being cooled for the first time are used2And the mixed gas of nitrogen, methane and water-gas liquid is cooled to 55-65 ℃ for the second time by a methanol air cooler, the time for cooling the second time is 45-60s, the mixed gas is cooled to 45 ℃ for the third time by a methanol water cooler, and the time for cooling the third time is 25-35 s.
Compared with the prior art, the invention adopts a purge gas reaction system, a methanol cooling system, a methanol separator, a water washing tower, a pipeline A, a pipeline B and a pipeline C; the purge gas reaction system is connected with a methanol cooling system through a pipeline A, the methanol cooling system is connected with a methanol separator through a pipeline B, the methanol separator is connected with a water washing tower through a pipeline C, and meanwhile, the invention also provides a methanol purge gas recycling processCompared with the traditional membrane separation technology, the pressure loss is small, the reacted gas can be directly supplied outside after high-purity hydrogen is extracted by the pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and CO in the purge gas can be discharged2The methanol is recovered, and the production cost is reduced.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals: the system comprises a 1-purge gas reaction system, a 2-methanol cooling system, a 3-methanol separator, a 4-water washing tower, a 5-A pipeline, a 6-B pipeline, a 7-C pipeline, an 8-intermediate heat exchanger, a 9-purge gas reactor, a 10-steam drum device, an 11-D pipeline, a 12-E pipeline, a 13-F pipeline, a 14-G pipeline, a 15-H pipeline, a 16-I pipeline, a 17-methanol air cooler, an 18-methanol water cooler, a 19-J pipeline, a 20-water inlet pipeline, a 21-water return pipeline, a 22-fan, a 23-motor, a 24-K pipeline, a 25-L pipeline, a 26-pressure swing adsorption device, a 27-M pipeline, a 28-N pipeline and a 29-flash evaporation tank.
The invention is further described with reference to the following figures and detailed description.
Detailed Description
Example 1 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the reacted gas can be directly supplied to the outside after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced.
Example 2 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out.
Example 3 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; methyl alcohol cooling system 2 includes methyl alcohol air cooler 17, methyl alcohol water cooler 18 and J pipeline 19, methyl alcohol air cooler 17 is connected with the other end of A pipeline 5, and methyl alcohol air cooler 17 passes through J pipeline 19 and is connected with methyl alcohol water cooler 18, methyl alcohol water cooler 18 is connected with B pipeline 6's one end, and the bottom of methyl alcohol water cooler 18 is provided with inlet channel 20, and the bottom of methyl alcohol water cooler 18 is provided with return water pipeline 21.
Example 4 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; a fan 22 is arranged above the methanol air cooler 17, and a motor 23 is arranged on the fan 22.
Example 5 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; a fan 22 is arranged above the methanol air cooler 17, and a motor 23 is arranged on the fan 22; the bottom of the methanol separator 3 is provided with a K-pipe 24.
Example 6 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; the top of water scrubber 4 is provided with L pipeline 25, and the one end of L pipeline 25 is connected with the top of water scrubber 4, and the other end of L pipeline 25 is provided with pressure swing adsorption equipment 26, and the bottom of water scrubber 4 is provided with M pipeline 27, and one side of water scrubber 4 is provided with N pipeline 28, and the one end of N pipeline 28 is connected with one side of water scrubber 4, and the other end of N pipeline 28 is provided with flash tank 29.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the purge gas of 7.4-7.6MPa to an intermediate heat exchanger 8 through a D pipeline 11, and heating through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube pass of the purge gas reactor 9 through an E pipeline 12 to react with a synthetic catalyst, and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of the boiler water of the purge gas reactor 92The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler 17 through a pipeline A5 for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282Reacts with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower 4 to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27.
Example 7 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; the top of water scrubber 4 is provided with L pipeline 25, and the one end of L pipeline 25 is connected with the top of water scrubber 4, and the other end of L pipeline 25 is provided with pressure swing adsorption equipment 26, and the bottom of water scrubber 4 is provided with M pipeline 27, and one side of water scrubber 4 is provided with N pipeline 28, and the one end of N pipeline 28 is connected with one side of water scrubber 4, and the other end of N pipeline 28 is provided with flash tank 29.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the purge gas of 7.4-7.6MPa to an intermediate heat exchanger 8 through a D pipeline 11, and heating through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube pass of the purge gas reactor 9 through an E pipeline 12 to react with a synthetic catalyst, and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of the boiler water of the purge gas reactor 92The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time;
s2, cooling the methanol, CO and H for the first time2Mixed gas of nitrogen, methane, water and the like is conveyed through the pipeline A5Sending to a methanol air cooler 17 for secondary cooling, and cooling methanol, CO and H for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282Reacts with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower 4 to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27.
In the step S1, the heating temperature through the intermediate heat exchanger 8 is 220-240 ℃, the heating time is 20-25S, the first cooling temperature of the reacted gas through the intermediate heat exchanger 8 is 80-95 ℃, and the first cooling time is 19-23S.
Example 8 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; the top of water scrubber 4 is provided with L pipeline 25, and the one end of L pipeline 25 is connected with the top of water scrubber 4, and the other end of L pipeline 25 is provided with pressure swing adsorption equipment 26, and the bottom of water scrubber 4 is provided with M pipeline 27, and one side of water scrubber 4 is provided with N pipeline 28, and the one end of N pipeline 28 is connected with one side of water scrubber 4, and the other end of N pipeline 28 is provided with flash tank 29.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the purge gas of 7.4-7.6MPa to an intermediate heat exchanger 8 through a D pipeline 11, and heating through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube pass of the purge gas reactor 9 through an E pipeline 12 to react with a synthetic catalyst, and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is discharged from the pot of the gas reactor 9Water produced by heat exchange of furnace water and methanol, CO and H2The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler 17 through a pipeline A5 for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282Reacts with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower 4 to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27.
In the step S1, the heating temperature through the intermediate heat exchanger 8 is 220-240 ℃, the heating time is 20-25S, the first cooling temperature of the reacted gas through the intermediate heat exchanger 8 is 80-95 ℃, and the first cooling time is 19-23S; and in the step S2, the mixed gas of the methanol, the CO, the H2, the nitrogen, the methane and the water-gas-liquid after the primary cooling is cooled to 55-65 ℃ for the second time by the methanol air cooler 17, the time for the second cooling is 45-60S, the mixed gas is cooled to 45 ℃ for the third time by the methanol water cooler 18, and the time for the third cooling is 25-35S.
Example 9 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; the top of water scrubber 4 is provided with L pipeline 25, and the one end of L pipeline 25 is connected with the top of water scrubber 4, and the other end of L pipeline 25 is provided with pressure swing adsorption equipment 26, and the bottom of water scrubber 4 is provided with M pipeline 27, and one side of water scrubber 4 is provided with N pipeline 28, and the one end of N pipeline 28 is connected with one side of water scrubber 4, and the other end of N pipeline 28 is provided with flash tank 29.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the 7.4MPa purge gas to an intermediate heat exchanger 8 through a D pipeline 11, and heating through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube pass of the purge gas reactor 9 through an E pipeline 12 to react with a synthetic catalyst, and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of the boiler water of the purge gas reactor 92The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler 17 through a pipeline A5 for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282With nitrogen gasThe mixed gas liquid of the methane and the methanol reacts with DW boiler water in a water washing tower 4 to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27.
In the step S1, the temperature of heating by the intermediate heat exchanger 8 is 240 ℃, the heating time is 20S, the temperature of first cooling of the reacted gas by the intermediate heat exchanger 8 is 95 ℃, and the time of first cooling is 19S; in the step S2, the mixed gas of methanol, CO, H2, nitrogen, methane, water, gas and liquid after the first cooling is cooled to 65 ℃ for the second time by the methanol air cooler 17, the cooling time for the second time is 45S, the cooling time for the third time is 25S, and the cooling time for the third time is 45 ℃ in the methanol water cooler 18.
Example 9 of the invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; the top of water scrubber 4 is provided with L pipeline 25, and the one end of L pipeline 25 is connected with the top of water scrubber 4, and the other end of L pipeline 25 is provided with pressure swing adsorption equipment 26, and the bottom of water scrubber 4 is provided with M pipeline 27, and one side of water scrubber 4 is provided with N pipeline 28, and the one end of N pipeline 28 is connected with one side of water scrubber 4, and the other end of N pipeline 28 is provided with flash tank 29.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the 7.5MPa purge gas to an intermediate heat exchanger 8 through a D pipeline 11, and heating through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube pass of the purge gas reactor 9 through an E pipeline 12 to react with a synthetic catalyst, and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of the boiler water of the purge gas reactor 92The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler 17 through a pipeline A5 for secondary cooling, and the secondary cooling methanol, CO, water and the like is carried out,H2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282Reacts with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower 4 to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27.
In the step S1, the temperature of heating by the intermediate heat exchanger 8 is 230 ℃, the heating time is 22.5S, the temperature of first cooling of the gas after reaction by the intermediate heat exchanger 8 is 87.5 ℃, and the time of first cooling is 21S; in the step S2, the mixed gas of methanol, CO, H2, nitrogen, methane, water, gas and liquid after the first cooling is cooled to 60 ℃ for the second time by the methanol air cooler 17, the time for the second cooling is 52.5S, the mixed gas is cooled to 45 ℃ for the third time by the methanol water cooler 18, and the time for the third cooling is 30S.
Example 10 of the present invention: a methanol purge gas recycling system comprises a purge gas reaction system 1, a methanol cooling system 2, a methanol separator 3, a water washing tower 4, an A pipeline 5, a B pipeline 6 and a C pipeline 7; the purge gas reaction system 1 is connected with a methanol cooling system 2 through an A pipeline 5, the methanol cooling system 2 is connected with a methanol separator 3 through a B pipeline 6, and the methanol separator 3 is connected with a water washing tower 4 through a C pipeline 7; the pressure loss of the purge gas is small during the methanol synthesis reaction, the gas after the reaction can be directly supplied externally after high-purity hydrogen is extracted by a pressure swing adsorption technology, hydrogen pressurization equipment is not needed, and the production cost is reduced; the purge gas reaction system 1 comprises an intermediate heat exchanger 8, a purge gas reactor 9 and a steam drum device 10, wherein the top of the intermediate heat exchanger 8 is connected with one end of a pipeline 5A, the left side and the right side of the intermediate heat exchanger 8 are provided with a pipeline D11 and a pipeline E12, one end of the pipeline E12 is connected with the intermediate heat exchanger 8, the other end of the pipeline E12 is connected with the top of the purge gas reactor 9, the bottom of the purge gas reactor 9 is provided with a pipeline F13, one end of the pipeline F13 is connected with the bottom of the purge gas reactor 9, the other end of the pipeline F13 is connected with the bottom of the intermediate heat exchanger 8, one side of the purge gas reactor 9 is provided with a pipeline G14 and a pipeline H15, one end of the pipeline G14 is connected with one side of the purge gas reactor 9, the other end of the pipeline G14 is connected with the bottom of the steam drum device 10, one end of the pipeline H15, the other end of the H pipeline 15 is connected with the bottom of the steam drum device 10, and the top of the steam drum device 10 is provided with an I pipeline 16; the pressure loss of the purge gas is small when the methanol synthesis reaction is carried out; the methanol cooling system 2 comprises a methanol air cooler 17, a methanol water cooler 18 and a J pipeline 19, wherein the methanol air cooler 17 is connected with the other end of the A pipeline 5, the methanol air cooler 17 is connected with the methanol water cooler 18 through the J pipeline 19, the methanol water cooler 18 is connected with one end of the B pipeline 6, a water inlet pipeline 20 is arranged at the bottom of the methanol water cooler 18, and a water return pipeline 21 is arranged at the bottom of the methanol water cooler 18; the top of water scrubber 4 is provided with L pipeline 25, and the one end of L pipeline 25 is connected with the top of water scrubber 4, and the other end of L pipeline 25 is provided with pressure swing adsorption equipment 26, and the bottom of water scrubber 4 is provided with M pipeline 27, and one side of water scrubber 4 is provided with N pipeline 28, and the one end of N pipeline 28 is connected with one side of water scrubber 4, and the other end of N pipeline 28 is provided with flash tank 29.
A methanol purge gas recycling process comprises the following steps:
s1, conveying the 7.6MPa purge gas to an intermediate heat exchanger 8 through a D pipeline 11, and heating through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube side and the tube combination of the purge gas reactor 9 through an E pipeline 12The catalyst is formed to react and be converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of the boiler water of the purge gas reactor 92The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler 17 through a pipeline A5 for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282Reacts with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower 4 to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27.
In the step S1, the temperature of heating by the intermediate heat exchanger 8 is 220 ℃, the heating time is 25S, the temperature of first cooling of the reacted gas by the intermediate heat exchanger 8 is 80 ℃, and the time of first cooling is 23S; in the step S2, the mixed gas of methanol, CO, H2, nitrogen, methane, water, gas and liquid after the first cooling is cooled to 55 ℃ for the second time by the methanol air cooler 17, the time for the second cooling is 60S, the mixed gas is cooled to 45 ℃ for the third time by the methanol water cooler 18, and the time for the third cooling is 35S.
The working principle of one embodiment of the invention is as follows: the invention conveys the purge gas of 7.4-7.6MPa to an intermediate heat exchanger 8 through a D pipeline 11, and the purge gas is heated through the intermediate heat exchanger 8; the heated purge gas is conveyed from the intermediate heat exchanger 8 to the tube pass of the purge gas reactor 9 through an E pipeline 12 to react with a synthetic catalyst, and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of the boiler water of the purge gas reactor 92The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment 10 for disposal through a G pipeline 14, and byproduct steam is produced through an I pipeline 16; methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to the intermediate heat exchanger 8 through an F pipeline 13 to be cooled for the first time; cooling the methanol, CO and H subjected to the first cooling2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler 17 through a pipeline A5 for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler 18 through a J pipeline 19 for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture; methanol, CO and H2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator 3 through a pipeline B6 for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline 24 for storage; mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to the water washing tower 4 through a C pipeline 7, DW desalted water and 55% of H are added into the water washing tower 4 through an N pipeline 282Reacting with mixed gas of nitrogen, methane and methanol and DW desalted water in a water washing tower 4 to form 55% of H2Mixed gas with nitrogen, methane and 15% methanol solution, 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline 25 and is sent to a pressure swing adsorption device 26 to be processed to generate high-purity hydrogen with the purity of 99.99 percent, and a methanol solution with the purity of 15 percent is sent to a flash tank 29 through an M pipeline 27. The invention leads the purge gas to directly carry out methanol synthesis reaction in one pass without arranging a compressor, has small pressure loss compared with the traditional membrane separation technology, can directly supply the high-purity hydrogen after the reacted gas is extracted by the pressure swing adsorption technology, does not need hydrogen pressurization equipment, and can also lead CO and CO in the purge gas to be supplied externally2The methanol is recovered, and the production cost is reduced.

Claims (9)

1. A methanol purge gas recycling system is characterized by comprising a purge gas reaction system (1), a methanol cooling system (2), a methanol separator (3), a water washing tower (4), an A pipeline (5), a B pipeline (6) and a C pipeline (7); the purge gas reaction system (1) is connected with the methanol cooling system (2) through an A pipeline (5), the methanol cooling system (2) is connected with the methanol separator (3) through a B pipeline (6), and the methanol separator (3) is connected with the water washing tower (4) through a C pipeline (7).
2. The methanol purge gas recycling system according to claim 1, wherein the purge gas reaction system (1) comprises an intermediate heat exchanger (8), a purge gas reactor (9) and a drum device (10), the top of the intermediate heat exchanger (8) is connected with one end of the A pipeline (5), the left side and the right side of the intermediate heat exchanger (8) are provided with a D pipeline (11) and an E pipeline (12), one end of the E pipeline (12) is connected with the intermediate heat exchanger (8), the other end of the E pipeline (12) is connected with the top of the purge gas reactor (9), the bottom of the purge gas reactor (9) is provided with an F pipeline (13), one end of the F pipeline (13) is connected with the bottom of the purge gas reactor (9), the other end of the F pipeline (13) is connected with the bottom of the intermediate heat exchanger (8), one side of the purge gas reactor (9) is provided with a G pipeline (14) and an H pipeline (15), one end of the G pipeline (14) is connected with one side of the purge gas reactor (9), the other end of the G pipeline (14) is connected with the bottom of the steam drum equipment (10), one end of the H pipeline (15) is connected with one side of the purge gas reactor (9), the other end of the H pipeline (15) is connected with the bottom of the steam drum equipment (10), and the top of the steam drum equipment (10) is provided with an I pipeline (16).
3. The methanol purge gas recycling system according to claim 1, wherein the methanol cooling system (2) comprises a methanol air cooler (17), a methanol water cooler (18) and a J pipeline (19), the methanol air cooler (17) is connected with the other end of the A pipeline (5), the methanol air cooler (17) is connected with the methanol water cooler (18) through the J pipeline (19), the methanol water cooler (18) is connected with one end of the B pipeline (6), a water inlet pipeline (20) is arranged at the bottom of the methanol water cooler (18), and a water return pipeline (21) is arranged at the bottom of the methanol water cooler (18).
4. The methanol purge gas recycling system according to claim 3, wherein a fan (22) is disposed above the methanol air cooler (17), and a motor (23) is disposed on the fan (22).
5. A methanol purge gas recycle system according to claim 1, characterized in that the bottom of the methanol separator (3) is provided with a K-pipe (24).
6. The methanol purge gas recycling system according to claim 1, wherein an L pipeline (25) is arranged at the top of the water scrubber (4), one end of the L pipeline (25) is connected with the top of the water scrubber (4), a pressure swing adsorption device (26) is arranged at the other end of the L pipeline (25), an M pipeline (27) is arranged at the bottom of the water scrubber (4), an N pipeline (28) is arranged at one side of the water scrubber (4), one end of the N pipeline (28) is connected with one side of the water scrubber (4), and a flash tank (29) is arranged at the other end of the N pipeline (28).
7. A methanol purge gas recycling process is characterized by comprising the following steps:
s1, conveying the purge gas of 7.4-7.6MPa to an intermediate heat exchanger (8) through a D pipeline (11), and heating through the intermediate heat exchanger (8); the heated purge gas is conveyed from the intermediate heat exchanger (8) to the tube pass of the purge gas reactor (9) through an E pipeline (12) and synthesizedThe agent reacts and is converted into methanol, CO and H2Mixed gas of nitrogen, methane and water, and a large amount of heat is released; the heat generated by the reaction is water, methanol, CO and H which are generated by the heat exchange of boiler water of the purge gas reactor (9)2The mixed gas of nitrogen, methane and water is conveyed to the steam drum equipment (10) for disposal through a G pipeline (14), and byproduct steam is produced through an I pipeline (16); methanol, CO and H after reaction2The mixed gas of nitrogen, methane, water and the like is conveyed to an intermediate heat exchanger (8) through an F pipeline (13) for primary cooling;
s2, cooling the methanol, CO and H for the first time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol air cooler (17) through a pipeline A (5) for secondary cooling, and the methanol, CO and H are cooled for the second time2The mixed gas of nitrogen, methane, water and the like is conveyed to a methanol water cooler (18) through a J pipeline (19) for third cooling to form methanol, CO and H2Nitrogen, methane, water-gas-liquid mixture;
s3, cooling the methanol, CO and H for the third time2The mixture of nitrogen, methane and water gas and liquid is conveyed to a methanol separator (3) through a pipeline B (6) for separation treatment, and 91.5 percent of crude methanol and 55 percent of H are formed2Gas-liquid mixture, 91.5 percent of crude methanol flows out through a K pipeline (24) for storage;
s4, mixing 55% of H2Mixed gas of nitrogen, methane and methanol is conveyed to a water washing tower (4) through a C pipeline (7), DW desalted water and 55% of H are added into the water washing tower (4) through an N pipeline (28)2Reacts with mixed gas of nitrogen, methane and methanol and DW boiler water in a water washing tower (4) to form 55 percent of H2Mixing with nitrogen, methane and 15% methanol solution, adding 55% H2The mixed gas with nitrogen and methane flows out through an L pipeline (25) and is sent to a pressure swing adsorption device (26) to be treated to generate high-purity hydrogen with the purity of 99.99 percent, and a 15 percent methanol solution is sent to a flash tank (29) through an M pipeline (27).
8. The methanol purge gas recycling system according to claim 7, wherein in the step S1, the heating temperature through the intermediate heat exchanger (8) is 220 ℃ and 240 ℃, the heating time is 20-25S, the first cooling temperature through the intermediate heat exchanger (8) of the reacted gas is 80-95 ℃, and the first cooling time is 19-23S.
9. The methanol purge gas recycling system according to claim 7, wherein in the step S2, the methanol, CO and H after the first cooling is performed2The mixed gas of nitrogen, methane and water-gas liquid is cooled to 55-65 ℃ for the second time by a methanol air cooler (17), the time for cooling for the second time is 45-60s, and the mixed gas is cooled to 45 ℃ for the third time by a methanol water cooler (18), and the time for cooling for the third time is 25-35 s.
CN202011203961.4A 2020-11-02 2020-11-02 Methanol purge gas recycling system and process Withdrawn CN112225639A (en)

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Publication number Priority date Publication date Assignee Title
CN115286496A (en) * 2022-07-01 2022-11-04 宁波巨化化工科技有限公司 Comprehensive utilization method of purge gas in organic alcohol production process

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CN102229434A (en) * 2011-04-05 2011-11-02 宁波金远东工业科技有限公司 Apparatus for joint production of methanol and synthetic ammonia by using exhaust gas from methanol synthesis
CN104710278A (en) * 2015-03-19 2015-06-17 宁波金远东石化工程技术有限公司 Methanol preparation device

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN102229434A (en) * 2011-04-05 2011-11-02 宁波金远东工业科技有限公司 Apparatus for joint production of methanol and synthetic ammonia by using exhaust gas from methanol synthesis
CN104710278A (en) * 2015-03-19 2015-06-17 宁波金远东石化工程技术有限公司 Methanol preparation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115286496A (en) * 2022-07-01 2022-11-04 宁波巨化化工科技有限公司 Comprehensive utilization method of purge gas in organic alcohol production process

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