Process for preparing liquefied natural gas (LNG) and hydrogen from coke oven gas
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A technology of coke oven gas and hydrogen, applied in hydrogen separation, gas fuel, petroleum industry, etc., can solve the problems of increasing power consumption
Active Publication Date: 2012-10-10
XINDI ENERGY ENG TECH
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Since the pressure of methane gas in the hydrogen extraction process of PSA is normal pressure, in order to meet the process requirements of the next section, it is necessary to increase the pressure of a compression device, thus increasing the power consumption
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[0062] Process scheme of the present invention is as follows:
[0063] Such as figure 2 As shown, the coke oven gas from outside the boundary area undergoes compression, deoiling and naphthalene removal, crude desulfurization, hydroconversion fine desulfurization, deacidification (CO 2 ), dehydration, cryogenic liquefaction separation, PSA hydrogen extraction unit, complete the whole process.
[0064] 1) Coke oven gas compression and deoiling and naphthalene removal
[0065] The coke oven gas (raw material gas) from outside the boundary area is compressed (for example, boosted to 0.1-0.5MPa) by a compressor (that is, the first-stage compressor) and enters the crude oil denaphthalene denaphthalene device for preliminary deoiling Naphthalene removal, and then through another compressor (that is, two-stage, or two-stage and three-stage compressor) to continue to increase the pressure (for example, to 0.45 ~ 3.0MPa) and enter the refined oil denaphthalene remover for further de...
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Abstract
The invention relates to a process for preparing liquefied natural gas (LNG) and hydrogen from coke oven gas. A process device for the process comprises a compressing device, an oil and naphthalene removing device, a coarse desulphurizing device, a fine desulphurizing device, a deacidifying device, a dehydrating device, a cryogenic liquefying and separating device, a pressure swing adsorption (PSA) hydrogen enriching and extracting device, and the like. The coke oven gas pressurized by the compressing device sequentially passes through each purifying, liquefying and separating device according to pressure difference to finally obtain an LNG product and a high-purity hydrogen, wherein the content of the hydrogen, nitrogen and carbon monoxide in the LNG is less than or equal to 2,000 ppm, less than or equal to 4% and less than or equal to 6% respectively; and the purity of the hydrogen product can reach 99.99%. The process of the invention overcomes the defects of the conventional process and consumes less energy than the conventional process.
Description
technical field [0001] The invention relates to the purification and liquefaction production of coke oven gas, in particular to pressurized deoiling, crude desulfurization, fine desulfurization, deacidification, dehydration, cryogenic liquefaction and separation using coke oven gas as raw material, and finally PSA hydrogen extraction to produce LNG and A process for the co-production of hydrogen. Background technique [0002] The main component of liquefied natural gas (LNG) is methane, which has a high calorific value (>31.4MJ / Nm 3 ) and convenient storage and transportation, it can be used for city gas supply, peak shaving and backup gas sources, gas vehicles, bottled gas, basic chemical raw materials, industrial gas, etc. [0003] Coke oven gas is one of the main by-products in the coking process of coal carbonization in coking plants. The main components are hydrogen, methane, CO, CO 2 etc., its impurities include tar, naphthalene, benzene, hydrogen sulfide, organic...
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