Coke oven coat gas comprehensive utilization method

Abstract

The present invention discloses a coke oven coat gas comprehensive utilization method, which comprises that: coke oven coal gas is subjected to temperature swing adsorption (TSA), fine desulfurization and pressure swing adsorption (PSA) to extract hydrogen so as to form two gases such as a high hydrogen content gas and a desorbing gas with a methane content of 50%; nitrogen gas is supplemented for the high hydrogen content gas, and methanation purification and deammoniation synthesis are performed to generate a product liquid ammonia under conditions such as catalysis, high temperature and high pressure; and the desorbing gas is conveyed into a methane liquefaction system and is compressed to achieve 2.5 MPa, and then methane synthesis, decarbonization, dehydration purification, and cryogenic separation are performed so as to finally form the liquefied methane (LNG) product. With the scheme of the present invention, the coke oven coal gas can be subjected to comprehensive utilization to obtain the two products.

Description

Technical field [0001] The invention belongs to a method for comprehensive utilization of coke oven gas. Background technique [0002] Coke oven gas, also known as coke oven gas, belongs to high calorific value gas due to its many combustible components. It refers to a kind of combustible gas produced by mixing several bituminous coals into coking coal after high-temperature dry distillation in the coking oven, producing coke and tar products at the same time. It is a by-product of the coking industry and is generally used as a fuel. The added value is low. Coke oven gas is a mixture, and its yield and composition vary depending on the quality of coking coal and coking process conditions. Generally, 300~350m of coke oven gas can be produced per ton of dry coal. 3 (Standard status). Its main components are hydrogen (55%~60%) and methane (23%~27%), and also contain a small amount of carbon monoxide (5%~8%), unsaturated hydrocarbons above C2 (2%~4%), carbon dioxide (1.5%~3%), oxy...

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Problems solved by technology

[0005] 2. Coke oven gas is a colorless, odorous gas;

[0006] 3. Coke oven gas contains CO and a small amount of H 2 S is poisonous;

[0007] 4. Coke oven gas contains more hydrogen, has a fast combustion speed and a short flame;

[0008] 5. If the coke oven gas is not purified well, it will contain more tar and naphthalene, which will block the pipes and fittings and bring difficulties to the fire adjustment work;

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