CN214422541U - Purge gas methanol synthesis system - Google Patents
Purge gas methanol synthesis system Download PDFInfo
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- CN214422541U CN214422541U CN202023280083.4U CN202023280083U CN214422541U CN 214422541 U CN214422541 U CN 214422541U CN 202023280083 U CN202023280083 U CN 202023280083U CN 214422541 U CN214422541 U CN 214422541U
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Abstract
The utility model belongs to the technical field of methanol synthesis, and relates to a purge gas methanol synthesis system; the system comprises a methanol synthesis tower and a gas-gas heat exchanger; a steam separator is arranged outside the methanol synthesis tower; a steam drum is axially arranged in the methanol synthesis tower, and two ends of the steam drum are respectively communicated with two ends of a steam separator; the steam separator is respectively connected with a boiler water pipeline and a steam output pipeline; the top end of the methanol synthesis tower is provided with a synthesis gas inlet; the bottom end of the methanol synthesis tower is provided with a synthesis gas outlet; a synthesis gas inlet is arranged at the bottom tube side of the gas-gas heat exchanger; the synthesis gas inlet is communicated with the synthesis gas inlet through the side of the gas-gas heat exchanger tube; the synthetic gas outlet is communicated with the shell side of the gas-gas heat exchanger. The utility model has small reactor, the synthesis tower steam drum is integrated, the thermal stress is small, the self-adaptive synthesis reaction heat transfer is realized, and the self-adaptive synthesis reaction heat transfer is suitable for occasions with small synthesis heat release; the process flow is short, the equipment is few, and the control is flexible according to the requirements of gas components; the synthesis efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of the methyl alcohol is synthesized, a purge gas methyl alcohol synthesis system is related to.
Background
Because inert components which do not react exist in the methanol synthesis gas, the inert gases are continuously accumulated in the system along with the progress of the synthesis reaction, so that the normal operation of the methanol synthesis working condition is influenced, the synthesis efficiency is reduced, the reaction output of the catalyst is influenced, the reaction speed and progress are reduced, the synthesis yield is influenced, and the power consumption of the system is increased; the purge gas must be continuously and quantitatively vented to maintain a substantially constant system inert composition and stable system production, and the purge gas composition is equivalent to the synthesis cycle gas composition. The main component of the methanol synthesis purge gas is H2、CO、CO2、Ar、N2And CH4The gas is used for recovering H in coordination with hydrogen recovery by utilizing the system pressure2、CO、CO2The method has the advantages of effectively converting, reducing the discharge loss of effective gas, realizing the reduction of production cost, reducing the consumption of unit methanol gas and the consumption of each item of the integral synthesis unit, and achieving the aim of improving the integral efficiency.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problem of the existing synthetic methanol, the utility model provides a purge gas methanol synthesis system, which is suitable for a matched synthesis tower and a system, the reactor is small, the steam drum of the synthesis tower is integrated, the steam drum and a heat exchange water-cooling spiral pipe are arranged in the synthesis tower, the thermal stress is small, the heat is removed by self-adaptive synthesis reaction, and the system is suitable for the occasion with small synthesis heat release; the process flow is short, the equipment is few, and the compressor is started and stopped according to the gas component requirement and is flexibly controlled; the synthesis unit can effectively make up, and the synthesis efficiency can be effectively improved.
In order to realize the purpose, the utility model discloses a technical scheme is:
a purge gas methanol synthesis system comprises a methanol synthesis tower and a gas-gas heat exchanger; a steam separator is arranged outside the methanol synthesis tower; a steam drum is axially arranged in the methanol synthesis tower, and two ends of the steam drum are respectively communicated with two ends of a steam separator; the steam separator is respectively connected with a boiler water pipeline and a steam output pipeline; the top end of the methanol synthesis tower is provided with a synthesis gas inlet; the bottom end of the methanol synthesis tower is provided with a synthesis gas outlet; a synthesis gas inlet is arranged on the bottom tube side of the gas-gas heat exchanger; the synthesis gas inlet is communicated with the synthesis gas inlet through the side of the gas-gas heat exchanger tube; the synthesis gas outlet is communicated with the shell side of the gas-gas heat exchanger.
Further, a spiral heat exchange tube is arranged in the methanol synthesis tower; the spiral heat exchange tube is attached to the outside of the steam drum.
Furthermore, the synthesis gas inlet and the synthesis gas outlet are both provided with reducer pipes.
Further, the purge gas methanol synthesis system also comprises a start-up steam pipeline; the start-up steam pipeline is communicated with the bottom of the methanol synthesis tower; and the start-up steam pipeline is communicated with a boiler water pipeline through a steam separator.
Further, the purge gas methanol synthesis system also comprises a separator, a water cooler and a crude methanol flash tank; the separator is respectively provided with a feed inlet, a gas phase outlet and a liquid phase outlet; the shell side of the gas-gas heat exchanger is communicated with the feed port through a water cooler; the gas phase outlet is communicated with an external discharge pipeline or a synthetic gas inlet; the liquid phase outlet is communicated with the crude methanol flash tank.
Further, the purge gas methanol synthesis system also comprises a recycle gas compressor and a variable frequency motor connected with the recycle gas compressor; the gas phase outlet is communicated with the synthesis gas inlet through a recycle gas compressor.
The utility model has the advantages that:
1. the purge gas methanol synthesis system provided by the utility model comprises a methanol synthesis tower and a gas-gas heat exchanger; a steam separator is arranged outside the methanol synthesis tower; a steam drum is axially arranged in the methanol synthesis tower, and two ends of the steam drum are respectively communicated with two ends of a steam separator; the steam separator is respectively connected with a boiler water pipeline and a steam output pipeline; the top end of the methanol synthesis tower is provided with a synthesis gas inlet; the bottom end of the methanol synthesis tower is provided with a synthesis gas outlet; a synthesis gas inlet is arranged on the bottom tube side of the gas-gas heat exchanger; the synthesis gas inlet is communicated with the synthesis gas inlet through the side of the gas-gas heat exchanger tube; the synthesis gas outlet is communicated with the shell side of the gas-gas heat exchanger. The steam pocket is a heat spiral pipe and is arranged in the methanol synthesis tower, and the heat expansion generated by the synthesis reaction is small; the reaction intensity is low, the reactor is small, and the heat exchange surface is matched with the reaction; the high-efficiency gas-phase gas-gas heat exchanger can adapt to occasions with small synthesis heat release.
2. The utility model provides a purge gas methanol synthesis method includes the following steps: 1) preheating and heating the synthesis gas by a gas-gas heat exchanger, then feeding the synthesis gas into a methanol synthesis tower, and reacting under the action of a catalyst to generate methanol and water; 2) feeding the methanol, water and unreacted synthesis gas generated in the step 1) into a gas-gas heat exchanger, exchanging heat with the synthesis gas, cooling, further cooling by a water cooler, and feeding into a separator to separate out crude methanol and unreacted gas; simultaneously, after heat released by methanol synthesis in the methanol synthesis tower exchanges heat with boiler water in the spiral water-cooling pipe, the produced steam enters a steam drum for separation and then is sent to a steam separator for separation again, and along with steam output, the boiler water entering the steam separator is continuously supplemented into the steam drum; 3) the separated crude methanol enters a crude methanol flash tank; and part of unreacted gas is compressed by a recycle gas compressor and then returns to the system for recycling or directly discharging or recycling hydrogen according to the components of the synthesis gas. The heat is transferred in a self-adaptive synthesis reaction through a steam drum and an external gas-gas heat exchanger, the thermal stress is small, and the device is suitable for occasions with small synthesis heat release; the synthesis process flow is short, the equipment is few, and the compressor is started and stopped according to the gas component requirement and is flexibly controlled; effectively makes up for the synthesis unit and improves the synthesis efficiency.
3. In the utility model, the synthetic gas is exhausted gas or exhausted gas after membrane. The composition and volume fraction of the synthesis gas are: 10-25% of inert gas, 70-95% of hydrogen and 2-15% of carbon monoxide and carbon dioxide. The utility model discloses the synthetic gas composition changes, and carbon monoxide gas content is high in the composition, opens the component that the compressor adjusted the synthetic gas, and the compressor can open according to the gas component and can stop, flexible control.
Drawings
FIG. 1 is a schematic diagram of a methanol synthesis system provided by the present invention;
wherein:
1-steam separator; 2-a methanol synthesis column; 3-gas heat exchanger; 4-a water cooler; 5-a separator; 6-circulating gas compressor, 7-steam drum; 8-air inlet three-way valve; 9-air outlet three-way valve; 10-crude methanol flash drum.
Detailed Description
The present invention will now be described in detail with reference to the accompanying drawings and examples.
Examples
Referring to fig. 1, the present embodiment provides a methanol synthesis column 2 and a gas-gas heat exchanger 3; a steam separator 1 is arranged outside the methanol synthesis tower 2; a steam drum 7 is axially arranged in the methanol synthesis tower 2, and two ends of the steam drum 7 are respectively communicated with two ends of the steam separator 1; the steam separator 1 is respectively connected with a boiler water pipeline and a steam output pipeline; the top end of the methanol synthesis tower 2 is provided with a synthesis gas inlet; the bottom end of the methanol synthesis tower 2 is provided with a synthesis gas outlet; a synthesis gas inlet is arranged at the bottom tube side of the gas-gas heat exchanger 3; the synthesis gas inlet is communicated with the synthesis gas inlet through the pipe side of the gas-gas heat exchanger 3; the synthesis gas outlet is communicated with the shell side of the gas-gas heat exchanger 3.
The methanol synthesis tower 2 provided by the embodiment is internally provided with a spiral heat exchange tube; the spiral heat exchange tube is attached to the outside of the steam drum 7.
The steam drum 7 provided in this embodiment is a heat spiral pipe, and a spiral water-cooling pipe provided in the methanol synthesis tower 2 is attached to the outside of the steam drum 7. The steam pocket 7 and the steam separator 1 arranged outside the methanol synthesis tower 2 form a communicating vessel, a spiral water-cooling pipe attached to the steam pocket 7 absorbs synthesis to release heat, boiler water enters the bottom of the steam pocket 7 to complete thermosiphon heat exchange, water in the heat spiral pipe of the steam pocket 7 becomes a steam-liquid mixture and enters the top of the steam pocket 7, and the steam is sent out of the steam separator 1 to separate steam from liquid.
The syngas inlet and the syngas outlet provided by the present embodiment are both provided with reducer pipes. The reducer pipe is connected through a flange and is used for adapting to an inlet and an outlet and serving as a manhole at the same time.
The purge gas methanol synthesis system provided by the embodiment further comprises a start-up steam pipeline; the start-up steam pipeline is communicated with the bottom of the methanol synthesis tower 2; and the start-up steam pipeline is communicated with the boiler water pipeline through the steam separator 1. The start-up steam pipeline is communicated with a connecting pipeline of the boiler water methanol synthesis tower 2 and is used for heating the steam drum 7 during start-up.
The gas-gas heat exchanger 3 provided by the embodiment is a spiral tube gas-gas heat exchanger, and the gas-gas heat exchanger 3 is of a shell-and-tube structure; the device comprises a tube side (tube side) and a shell side (shell side), wherein a synthesis gas inlet is arranged on the bottom tube side of a gas-gas heat exchanger 3, the top tube side of the gas-gas heat exchanger 3 is connected with a synthesis gas inlet at the top of a methanol synthesis tower 2, and a synthesis gas outlet at the bottom of the methanol synthesis tower 2 is communicated with a shell side inlet on the upper side wall of the gas-gas heat exchanger 3; the shell side outlet on the lower side wall of the gas-gas heat exchanger 3 is communicated with the water cooler 4. After the synthesis gas enters the methanol synthesis tower 2 for synthesis reaction after going through the tube pass of the gas-gas heat exchanger 3, the synthesis gas enters the shell pass of the gas-gas heat exchanger 3; heat exchange is realized.
The purge gas methanol synthesis system provided by the embodiment further comprises a separator 5, a water cooler 4 and a crude methanol flash tank 10; the separator 5 is respectively provided with a feed inlet, a gas phase outlet and a liquid phase outlet; the side wall of the lower part of the gas-gas heat exchanger 3 is communicated with the feed inlet through a water cooler 4; the gas phase outlet is communicated with an external discharge pipeline or a synthetic gas inlet; the liquid phase outlet is communicated with a crude methanol flash tank 10.
Specifically, a feed inlet is arranged on the side wall of the separator 5; the top end of the separator 5 is provided with a gas phase outlet, and the bottom end of the separator 5 is provided with a liquid phase outlet; the separator 5 is internally provided with a defoaming net which is arranged above the feed inlet and used for removing impurities in the gas flowing to the gas phase outlet.
The purge gas methanol synthesis system provided by the embodiment further comprises a recycle gas compressor 6 and a variable frequency motor connected with the recycle gas compressor 6; the gas phase outlet is connected to the synthesis gas inlet via a recycle gas compressor 6.
The methanol synthesis tower 2 provided by the embodiment is internally provided with a spiral heat exchange tube; the spiral heat exchange tube is attached to the outside of the steam drum 7.
Example 2
The methanol synthesis method of purge gas provided by the utility model is illustrated by specific gas to be synthesized.
The synthesis gas is purge gas, and the inert gas is 10%, the hydrogen is 95%, and the carbon monoxide and the carbon dioxide are 2%.
In this example, the method for synthesizing methanol by purge gas is as follows:
1) preheating the synthesis gas through a tube pass of a gas-gas heat exchanger 3, raising the temperature, then feeding the synthesis gas into a methanol synthesis tower 2, and reacting under the action of a catalyst to generate methanol and water;
2) the methanol, water and synthesis gas which does not participate in the synthesis reaction generated in the step 1) enter the shell side of a gas-gas heat exchanger 3, exchange heat with the synthesis gas to be synthesized entering the tube side of the gas-gas heat exchanger 3 to reduce the temperature, and then enter a separator 5 to separate crude methanol and unreacted gas after being further cooled by a water cooler 4; meanwhile, after heat released by methanol synthesis in the methanol synthesis tower 2 exchanges heat with boiler water in the spiral water-cooling pipe, the produced steam enters the steam drum 7 for separation and then is sent to the steam separator 1 for separation again, and along with steam output, the boiler water entering the steam separator 1 is continuously supplemented into the steam drum 7;
3) the separated crude methanol is sent to a crude methanol flash tank 10; unreacted gas is selected according to CO and CO in the gas to be synthesized2The hydrogen is directly discharged or recovered without being subjected to compression cycle by the recycle gas compressor 6.
In the step 1), the catalyst is filled in the heat exchange section of the spiral heat exchange tube, the outside of the steam pocket 7 and the gap formed in the methanol synthesis tower 2. And the catalyst is a copper-based methanol synthesis catalyst.
In particular, the gas to be synthesized (at a temperature of20 ℃) enters a tube pass of the gas-gas heat exchanger from a synthesis gas inlet at the bottom of the gas-gas heat exchanger 3 through an air inlet three-way valve 8, is preheated to 200 ℃ together with methanol synthesis gas from the methanol synthesis tower 2, is discharged from the tube pass of the gas-gas heat exchanger at the top of the gas-gas heat exchanger 3, enters the methanol synthesis tower 2 from a synthesis gas inlet at the top of the methanol synthesis tower 2, and reacts with CO + CO under the action of a copper-based methanol synthesis catalyst2+5H2→2CH3OH+H2O, generating methanol and water by carbon monoxide, carbon dioxide and hydrogen in the synthesis gas under the action of a catalyst;
because the water-cooling pipe outside the steam pocket 7 absorbs the synthesis and releases heat, the heat released by the methanol synthesis tower 2 for synthesizing methanol exchanges heat with the boiler water in the spiral water-cooling pipe, the generated steam enters the steam pocket 7 for separation and then is sent into the steam separator 1 for separation again, and the boiler water entering the steam separator 1 is continuously supplemented into the steam pocket 7 along with the output of the steam; the system has small thermal stress, is self-adaptive to the heat transfer of the synthesis reaction and is suitable for occasions with small synthesis heat release;
the generated methanol, water and unreacted synthesis gas (the temperature is 280 ℃) enter an upper shell pass at the side of a gas-gas heat exchanger 3 from a synthesis gas outlet at the bottom of a methanol synthesis tower 2, the generated methanol, the water and the unreacted synthesis gas are preheated and heated with the synthesis gas to be synthesized in a tube pass of the gas-gas heat exchanger 3, the generated methanol, the water and the unreacted synthesis gas are discharged from a lower shell pass at the side of the gas-gas heat exchanger 3 and cooled by a water cooler 4, the methanol, the water and the unreacted synthesis gas enter a separator 5 from the side wall at the middle part of the separator 5 for gas-liquid separation to obtain condensate and non-condensate gas (unreacted gas), the condensate is crude methanol, and the crude methanol is discharged from a liquid phase outlet at the bottom of the separator 5 to a methanol flash tank 10 for further synthesizing refined methanol; the non-condensable gas is discharged from a gas phase outlet at the top of the separator 5 and is directly discharged through an outlet three-way valve 9;
in the synthesis process, the components of the gas to be synthesized are monitored, when the gas components in the gas to be synthesized are changed and the content of carbon monoxide in the components is low, the gas does not need to be circulated, and the non-condensable gas is directly discharged from the top of the separator 5 through the gas outlet three-way valve 9.
Example 3
The synthesis gas is post-membrane purge gas and is, among others, 15% inert gas, 70% hydrogen, 15% carbon monoxide and carbon dioxide.
In this example, the method for synthesizing methanol by purge gas is as follows:
1) the synthesis gas enters a methanol synthesis tower 2 after being preheated and heated by a gas-gas heat exchanger 3 and reacts under the action of a catalyst to generate methanol and water;
2) the methanol, water and synthesis gas which does not participate in the synthesis reaction generated in the step 1) enter the shell side of a gas-gas heat exchanger 3, exchange heat with the synthesis gas to be synthesized entering the tube side of the gas-gas heat exchanger 3 to reduce the temperature, and then enter a separator 5 to separate crude methanol and unreacted gas after being further cooled by a water cooler 4; meanwhile, after heat released by methanol synthesis in the methanol synthesis tower 2 exchanges heat with boiler water in the spiral water-cooling pipe, the produced steam enters the steam drum 7 for separation and then is sent to the steam separator 1 for separation again, and along with steam output, the boiler water entering the steam separator 1 is continuously supplemented into the steam drum 7;
3) the separated crude methanol is sent to a crude methanol flash tank 10; unreacted gas is compressed by the recycle gas compressor 6 according to the components of the synthesis gas and returns to the system circularly, namely the unreacted gas is compressed by the ring compressor 6 and returns to the inlet of the synthesis gas.
Specifically, the synthesis gas (with the temperature of 50 ℃) enters the tube pass of the gas-gas heat exchanger from the synthesis gas inlet at the bottom of the gas-gas heat exchanger 3 through the gas inlet three-way valve 8, is preheated to 260 ℃ together with the methanol synthesis gas from the methanol synthesis tower 2, is discharged from the tube pass of the gas-gas heat exchanger at the top of the gas-gas heat exchanger 3, enters the methanol synthesis tower 2 from the synthesis gas inlet at the top of the methanol synthesis tower 2, and reacts with CO + CO under the action of the copper-based methanol synthesis catalyst2+5H2→2CH3OH+H2O, generating methanol and water by carbon monoxide, carbon dioxide and hydrogen in the synthesis gas under the action of a catalyst;
because the water-cooling pipe outside the steam pocket 7 absorbs the synthesis and releases heat, the heat released by the methanol synthesis tower 2 for synthesizing methanol exchanges heat with the boiler water in the spiral water-cooling pipe, the generated steam enters the steam pocket 7 for separation and then is sent into the steam separator 1 for separation again, and the boiler water entering the steam separator 1 is continuously supplemented into the steam pocket 7 along with the output of the steam; the system has small thermal stress, is self-adaptive to the heat transfer of the synthesis reaction and is suitable for occasions with small synthesis heat release;
the generated methanol and unreacted synthesis gas (the temperature is 300 ℃) enter the upper shell pass at the side of a gas-gas heat exchanger 3 from a synthesis gas outlet at the bottom of a methanol synthesis tower 2, the generated methanol and the unreacted synthesis gas are preheated and heated with the synthesis gas to be synthesized in the tube pass of the gas-gas heat exchanger 3, the generated methanol and the unreacted synthesis gas are discharged from the lower shell pass at the side of the gas-gas heat exchanger 3 and cooled by a water cooler 4, the methanol and the unreacted synthesis gas enter a separator 5 from the side wall of the middle part of the separator 5 for gas-liquid separation to obtain condensate and non-condensate gas (unreacted gas), the condensate is crude methanol, and the condensate is discharged from a liquid phase outlet at the bottom of the separator 5 to a methanol flash tank 10 for further synthesis of refined methanol; the noncondensable gas is discharged from the top of the separator 5, the components of the synthesis gas are monitored in the synthesis process, when the gas components in the synthesis gas change, the content of carbon monoxide and carbon dioxide in the components is high through monitoring, the gas content exceeds 100%, the circulating gas compressor 6 is opened at the moment, the noncondensable gas circularly returns to the system after being compressed by the gas outlet three-way valve 9 and the circulating gas compressor 6 from the gas phase outlet at the top of the separator 5, and is converged with the synthesis gas to enter the tube pass circulating reaction of the gas-gas heat exchanger 3, so that the purpose of adjusting the components of the synthesis gas is achieved.
The utility model provides a methanol synthesis system and a synthesis method thereof.A hot spiral tube steam pocket is arranged in a methanol synthesis tower, and the thermal expansion is small; the whole system has low synthesis reaction intensity, the volume of the reaction equipment is small, and the heat exchange area is always matched with the reaction equipment; the high-efficiency gas-gas heat exchanger can meet the requirement of small thermal head; the circulating gas compressor can be started and stopped according to the requirements of gas components, and is flexibly controlled; the methanol synthesis process is short and rapid, and the synthesis efficiency is high.
Claims (6)
1. A purge gas methanol synthesis system, characterized by: the purge gas methanol synthesis system comprises a methanol synthesis tower (2) and a gas-gas heat exchanger (3); a steam separator (1) is arranged outside the methanol synthesis tower (2); a steam drum (7) is axially arranged in the methanol synthesis tower (2) and two ends of the steam drum (7) are respectively communicated with two ends of the steam separator (1); the steam separator (1) is respectively externally connected with a boiler water pipeline and a steam output pipeline; the top end of the methanol synthesis tower (2) is provided with a synthesis gas inlet; the bottom end of the methanol synthesis tower (2) is provided with a synthesis gas outlet; a synthesis gas inlet is arranged on the bottom tube side of the gas-gas heat exchanger (3); the synthesis gas inlet is communicated with the synthesis gas inlet through the tube side of the gas-gas heat exchanger (3); the synthesis gas outlet is communicated with the shell side of the gas-gas heat exchanger (3).
2. The purge gas methanol synthesis system of claim 1, wherein: a spiral heat exchange tube is arranged in the methanol synthesis tower (2); the spiral heat exchange tube is additionally loaded outside the steam pocket (7).
3. The purge gas methanol synthesis system of claim 2, wherein: and the synthesis gas inlet and the synthesis gas outlet are both provided with reducer pipes.
4. The purge gas methanol synthesis system of claim 3, wherein: the purge gas methanol synthesis system also comprises a start-up steam pipeline; the start-up steam pipeline is communicated with the bottom of the methanol synthesis tower (2); and the start-up steam pipeline is communicated with a boiler water pipeline through a steam separator (1).
5. The purge gas methanol synthesis system of claim 4, wherein: the purge gas methanol synthesis system also comprises a separator (5), a water cooler (4) and a crude methanol flash tank (10); the separator (5) is respectively provided with a feed inlet, a gas phase outlet and a liquid phase outlet; the shell side of the gas-gas heat exchanger (3) is communicated with the feed inlet through a water cooler (4); the gas phase outlet is communicated with an external discharge pipeline or a synthetic gas inlet; the liquid phase outlet is communicated with a crude methanol flash tank (10).
6. The purge gas methanol synthesis system of claim 5, wherein: the purge gas methanol synthesis system also comprises a circulating gas compressor (6) and a variable frequency motor connected with the circulating gas compressor (6); the gas phase outlet is communicated with the synthesis gas inlet through a recycle gas compressor (6).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112851471A (en) * | 2020-12-30 | 2021-05-28 | 陕西聚能新创煤化科技有限公司 | Purge gas methanol synthesis system and synthesis method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112851471A (en) * | 2020-12-30 | 2021-05-28 | 陕西聚能新创煤化科技有限公司 | Purge gas methanol synthesis system and synthesis method |
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