Expansion refrigeration method for separating coke oven gas by using nitrogen and helium

A technology of expansion refrigeration and coke oven gas, which is applied in the direction of gas fuel, combustible gas purification, climate sustainability, etc., can solve the problems of complicated process and difficult to guarantee stability, so as to reduce environmental pollution, reduce emptying phenomenon, improve Effect of Utilization Efficiency and Energy Utilization Rate

Inactive Publication Date: 2018-11-13
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0011] The Chinese invention patent with the publication number CN106315510A discloses a coke oven gas hydrogen production process. On the basis of the traditional coke oven gas hydrogen production process, the light hydrocarbon conversion and carbon monoxide medium temperature conversion process are introduced to make the coke oven gas in the raw m

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  • Expansion refrigeration method for separating coke oven gas by using nitrogen and helium

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Embodiment 1

[0035] A low-temperature cycle for producing liquefied natural gas (LNG) and liquid hydrogen (LH) from coke oven gas by using nitrogen and helium expansion 2 ) process, the implementation scheme is as figure 1 shown. The gas expansion cycle refrigerants are pure nitrogen and helium, of which the low-temperature working medium of the first expansion cycle is nitrogen, and the low-temperature working medium of the other two expansion cycles is helium, and the three-stage expansion cycle refrigerant flow rate is 5000 kmol / h , 5000kmol / h, 5500kmol / h, the raw coke oven gas includes the following mole fraction components: 50% CH 4 +50%H 2 , the pressure of coke oven gas is 0.2MPa, the temperature is 35°C, and the flow rate is 1000kmol / h. The specific steps of using coke oven gas to produce liquefied natural gas and liquid hydrogen are as follows:

[0036] 1) Change CH 4 and H 2 The purified coke oven gas COG-101 with a mole fraction of 50% is introduced into two-stage compressi...

Embodiment 2

[0049] A low-temperature cycle for producing liquefied natural gas (LNG) and liquid hydrogen (LH) from coke oven gas by using nitrogen and helium expansion 2 ) process, the implementation scheme is as figure 1 shown. The gas expansion cycle refrigerants are pure nitrogen and helium, of which the low-temperature working medium of the first expansion cycle is nitrogen, and the low-temperature working medium of the other two expansion cycles is helium, and the three-stage expansion cycle refrigerant flow rate is 5000 kmol / h , 4800kmol / h, 4600kmol / h, the raw coke oven gas includes the following mole fraction components: 60% CH 4 +40%H 2 , the pressure of coke oven gas is 0.2MPa, the temperature is 35°C, and the flow rate is 1000kmol / h. The specific steps of using coke oven gas to produce liquefied natural gas and liquid hydrogen are as follows:

[0050] 1) Change CH 4 and H 2 The purified coke oven gas COG-101 with mole fractions of 60% and 40% respectively is introduced into...

Embodiment 3

[0063] A method utilizing nitrogen and helium expansion refrigeration to separate coke oven gas, the method comprising the following steps:

[0064] 1) After the coke oven gas is compressed and pre-cooled, it is sent to the first-stage nitrogen cycle expansion refrigeration system, and then sent to the rectification tower after further cooling;

[0065] 2) After the methane discharged from the bottom of the rectification tower is cooled and liquefied by the secondary helium circulation expansion refrigeration system, it is sent to the storage tank of liquefied natural gas for storage. After the transformation of normal and secondary states, it is sent to the liquid hydrogen storage tank for storage, wherein, the first normal and secondary state conversion process is provided by the second-stage helium cycle expansion refrigeration system, and the second normal and secondary state conversion process is provided by the third-stage helium cycle expansion refrigeration system. The...

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Abstract

The invention relates to an expansion refrigeration method for separating coke oven gas by using nitrogen and helium. The method comprises the following steps: (1) after compression and precooling ofcoke oven gas, feeding the treated coke oven gas into a first-stage nitrogen cycle expansion refrigeration system, and feeding the treated coke oven gas into a rectification tower through further cooling; (2) after methane exhausted at the bottom of the rectification tower is cooled and liquefied through a second-stage nitrogen cycle expansion refrigeration system, feeding the cooled and liquefiedmethane into a natural gas storage tank for storage, after carrying out first ortho para conversion and second ortho para conversion on hydrogen exhausted at the top of the rectification tower in sequence, feeding the hydrogen into a liquid hydrogen storage tank for storage, wherein cooling capacity is provided by the second-stage nitrogen cycle expansion refrigeration system in the first ortho para conversion process, and cooling capacity is provided by a third-stage nitrogen cycle expansion refrigeration system in the second ortho para conversion process. Compared with the prior art, liquefied natural gas and liquid hydrogen are prepared from the coke oven gas through nitrogen and helium expansion low-temperature cycle, so that the utilization efficiency and energy utilization rate of the coke oven gas are improved, the evacuation phenomenon of the coke oven gas is reduced, and the environmental pollution is little.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of coke oven gas in the coking / steel mill industry, and relates to a method for separating coke oven gas by expanding and cooling nitrogen and helium. Background technique [0002] my country's coke production ranks among the top in the world, with 233 million tons in 2006, 353 million tons in 2009, and 443 million tons in 2012. A large amount of coke oven gas will be produced while coke is produced. If 1t of coke is produced, 430m 3 Calculation of coke oven gas, in 2012, the annual production of coke oven gas in my country reached 190.5 billion m 3 , of which about 70% of the coke oven gas is used for the self-use of enterprises, commercial and urban residents, and the remaining coke oven gas is basically not well utilized, and some are even directly burned and released into the atmosphere. At present, the industrial use of coke oven gas mainly includes: as city gas, power gen...

Claims

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Application Information

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IPC IPC(8): C10K1/00C10L3/10
CPCC10K1/00C10L3/10C10L2290/543Y02P20/10
Inventor 林文胜许婧煊
Owner SHANGHAI JIAO TONG UNIV
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