Method for producing liquefied natural gas by coke oven gas
A technology of liquefied natural gas and coke oven gas, which is applied in the direction of gas fuel, petroleum industry, fuel, etc., can solve the problems of poor environmental protection, low product output, high energy consumption, etc., to save construction investment, simplify the structure of the cold box, and simplify the process flow Effect
Inactive Publication Date: 2013-02-27
CHINA ELECTRONICS ENG DESIGN INST
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[0002] Most of the existing industrial production methods of liquefied natural gas are to directly use coke oven gas to produce liquefied natural gas (LNG), and the main disadvantage is that H in coke oven gas 2 Obviously too much, when coke oven gas is directly used to produce LNG, H 2 Surplus, after the production is completed, it is necessary to put the surplus H 2 Separation from liquefied gas products, resulting in high energy consumption, low product output, poor environmental protection, and poor factory efficiency
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[0039] For further illustrating the present invention, specifically illustrate in conjunction with following examples:
[0040] Such as figure 1 Shown, a kind of method utilizing coke oven gas to produce liquefied natural gas, it is to adopt gas distribution method to produce LNG, specifically comprises the following steps:
[0041] The first step is to prepare mixed gas:
[0042] Coke oven gas (mainly containing CO and H 2 , where H 2 High content, low CO content) Dust removal, tar removal boost to 4.2MPa;
[0043] Coal gas with a pressure of 4.2MPa (mainly containing CO and H) directly from the coal gasification plant is used 2 , where CO content is high, H 2 low content) and mix with the coke oven gas after dedusting and tar removal; make the H in the mixed gas 2 The molar ratio with CO is 3~3.2:1;
[0044] The second step of mixed gas purification:
[0045] Mixed gas removal of H 2 S: When the gas used for gas distribution mainly contains CO, remove a small amount...
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The invention relates to a method for producing liquefied natural gas by coke oven gas. The method comprises the following steps of adding waste gas and tail gas with certain pressure discharged by a gas plant or a smelting plant to coke oven gas, forming mixed coal gas, wherein the mol ratio of H2 to CO in the mixed coal gas is 3-3.2 : 1, or the mol ratio of H2 to CO2 is 4-4.2 : 1; purifying the mixed coal gas and performing methanation reaction. By adopting the method provided by the invention, the defect that the hydrogen is excessive in LNG (liquefied natural gas) products is overcome; the LNG is produced by a gas distribution method, the excessive H2 is converted into CH4, and the converted gas increases the content of CH4, and meanwhile, no H2 is contained; and in addition, the CH4 in the air is recovered by using PSA, and the recovered CH4 is returned to the coke oven gas to reuse, so that the purposes of energy-saving, environmental friendliness and increasing in yield and efficiency are realized.
Description
technical field [0001] The present invention relates to a process for the industrial production of liquefied natural gas. Background technique [0002] Most of the existing industrial production methods of liquefied natural gas are to directly use coke oven gas to produce liquefied natural gas (LNG), and the main disadvantage is that H in coke oven gas 2 Obviously too much, when coke oven gas is directly used to produce LNG, H 2 Surplus, after the production is completed, it is necessary to put the surplus H 2 Separation from liquefied gas products results in high energy consumption, low product output, poor environmental protection, and poor factory efficiency. [0003] existing excess H 2 There are generally two kinds of processes for separation: primary separation and pre-separation process. The materials used in the pre-separation process are different, and there are membrane separation method and PSA method. [0004] 1. Primary separation process (cold method) [0...
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IPC IPC(8): C10L3/08
Inventor 梅安华李红凯刘冲王秋明吴卫兵
Owner CHINA ELECTRONICS ENG DESIGN INST