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Low-temperature methanol washing process method and device with low energy consumption and high carbon capture rate

A low-temperature methanol washing and capture rate technology, applied in the field of coal chemical industry, can solve the problems of high energy consumption and low carbon capture rate, and achieve high energy consumption, high resource utilization, reduced cooling capacity and compression power consumption. Effect

Pending Publication Date: 2020-06-19
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] In order to overcome the above problems of high energy consumption and low carbon capture rate, the primary purpose of the present invention is to provide a process device for low-temperature methanol washing with low energy consumption and high carbon capture rate

Method used

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  • Low-temperature methanol washing process method and device with low energy consumption and high carbon capture rate
  • Low-temperature methanol washing process method and device with low energy consumption and high carbon capture rate
  • Low-temperature methanol washing process method and device with low energy consumption and high carbon capture rate

Examples

Experimental program
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Effect test

Embodiment 1

[0047] This embodiment provides a process method for low-temperature methanol washing using the above-mentioned device.

[0048] 40℃, 56bar, 17805kmol / h synthesis gas, containing 46.61% H 2 , 20.37% CO, 32.12% CO 2 , 0.3% N 2 , 0.1% Ar, 0.23% H 2 S and 0.27% H 2 O, through the gas-liquid separator, enters the desulfurization tower, and is enriched by CO 2 The methanol solution is absorbed and separated, and gas (CO 47.5%, H 2 21.2%, CO 2 30.8%, 0.5% N 2 and AR), overhead gas and CO 2 The first inlet of the condenser is connected and condensed to obtain 45.76kmol / h of CO and 159.9kmol / h of H 2 , 4451.27kmol / h of CO 2 Liquid carbon dioxide, and H containing 8253.27kmol / h 2 , 3502.21kmol / h of CO, 1739.44kmol / h of CO 2 , 52.1kmol / h of N 2 and 16.98 kmol / h of Ar synthesis gas. The temperature is 162°C, the pressure is 6.62bar, and the 6200kmol / h LNG is connected to the second inlet of the carbon dioxide condenser. Export sent. The synthesis gas containing condensate ...

Embodiment 2

[0051] This embodiment provides a process method for low-temperature methanol washing using the above-mentioned device.

[0052] 40℃, 56bar, 13353.75kmol / h synthesis gas, containing 46.61% H 2 , 20.37% CO, 32.12% CO 2 , 0.3% N 2 , 0.1% Ar, 0.23% H 2 S and 0.27% H 2 O, through the gas-liquid separator, enters the desulfurization tower, and is enriched by CO 2 The methanol solution is absorbed and separated, and the gas (CO47.5%, H 2 21.2%, CO 2 30.8%, 0.5% N 2 and AR), overhead gas and CO 2 The first inlet of the condenser is connected and condensed to obtain 34.32kmol / h of CO and 119.925kmol / h of H 2 , 3338.4525kmol / h of CO 2 Liquid carbon dioxide, and H containing 6189.95kmol / h 2 , 2626.66kmol / h of CO, 1304.58kmol / h of CO 2 , 39.075kmol / h of N 2and 12.735 kmol / h of Ar synthesis gas. The temperature is 162°C, the pressure is 6.62bar, and the 4650kmol / h LNG is connected to the second inlet of the carbon dioxide condenser. Export sent. The synthesis gas containing...

Embodiment 3

[0055] This embodiment provides a process method for low-temperature methanol washing using the above-mentioned device.

[0056] 40℃, 56bar, 26707.5kmol / h synthesis gas, containing 46.61% H 2 , 20.37% CO, 32.12% CO 2 , 0.3% N 2 , 0.1% Ar, 0.23% H 2 S and 0.27% H 2 O, through the gas-liquid separator, enters the desulfurization tower, and is enriched by CO 2 The methanol solution is absorbed and separated, and the gas (CO47.5%, H 2 21.2%, CO 2 30.8%, 0.5% N 2 and AR), overhead gas and CO 2 The first inlet of the condenser is connected and condensed to obtain 68.64kmol / h of CO and 239.85kmol / h of H 2 , 6676.905kmol / h of CO 2 liquid carbon dioxide, and H containing 12379.905 kmol / h 2 , 5253.315kmol / h of CO, 2609.16kmol / h of CO 2 , 78.15kmol / h of N 2 and 25.47 kmol / h of Ar synthesis gas. The temperature is 162°C, the pressure is 6.62bar, and the 9300kmol / h LNG is connected to the second inlet of the carbon dioxide condenser. Export sent. The synthesis gas containing...

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Abstract

The invention belongs to the technical field of coal chemical industry, and particularly relates to a low-temperature methanol washing process method and device with low energy consumption and high carbon capture rate. The device comprises a feed gas separator, a desulfurization tower, a CO2 condenser, a synthesis gas flash evaporator, a CO2 / H2S methanol-rich flash evaporator, a decarburization tower, a CO2 methanol-rich flash evaporator, a semi-lean methanol flash evaporator, an H2S concentration tower, a desorption tower and a methanol-water separation tower which are connected in sequence.According to the process, the cooling capacity of LNG and the carbon dioxide liquefaction process of low-temperature methanol washing are coupled, the purity of captured carbon dioxide can be improved, methanol consumption in the original low-temperature methanol washing process can be reduced, and the cooling capacity and compression power consumption in the low-temperature methanol washing process are further reduced. According to the process, higher resource utilization rate can be realized, carbon emission is reduced, the consumption of lean methanol is reduced by 15%-45%, the total energyconsumption is reduced by 10%-50%, and the carbon capture rate is increased by 20%-50%. Meanwhile, the cost of an adjusting process in a factory is reduced through small equipment modification, and the method and the device can be widely applied to optimization of a traditional process.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry, and specifically relates to a process method and device for low-temperature methanol washing with low energy consumption and high carbon capture rate. Through the invention, the consumption of cold energy in the process of low-temperature methanol washing can be saved and efficient carbon dioxide can be realized. capture rate. Background technique [0002] my country's energy structure is rich in coal, poor in gas, and low in oil. Therefore, under the rich coal resources, the coal chemical industry has been vigorously developed, and the clean, efficient, and energy-saving coal gasification technology has become a key development direction. The shift gas obtained after pressurized gasification of coal not only contains H 2 and CO, also contains a large amount of H 2 S, CO 2 Such acidic gases will cause catalyst poisoning in the subsequent reaction process. [0003] The low-tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/16C10K1/04B01D53/14
CPCC10K1/004C10K1/005C10K1/165C10K1/04B01D53/1431B01D53/1462B01D2252/2021Y02C20/40Y02P20/151
Inventor 杨思宇陈建军钱宇
Owner SOUTH CHINA UNIV OF TECH
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