Method for producing chemical fertilizers and intermediate chemical products by aid of underground gasification product gas of coal

Abstract

The invention provides a method for producing chemical fertilizers and intermediate chemical products by the aid of underground gasification product gas of coal. One of schemes includes that gasification modes for crude synthetic gas which is generated on the basis of a plurality of ISC underground gasification furnaces by means of gasification and has an appropriate economic scale include air gasification modes or oxygen-rich gasification modes. The method includes steps of (1), pretreating the crude synthetic gas; (2), desulfurizing dry synthetic gas; (3), transforming and cooling the dry synthetic gas; (4), decarburizing the dry synthetic gas; (5), carrying out methanation and purification; (6), synthesizing ammonia; (7), synthesizing urea. The method has the advantages that technological processes for comprehensively utilizing the synthetic gas on downstream are provided for the underground gasification product gas of the coal besides power generation, byproducts (such as sulfur, carbon dioxide, technological water and coal tar) in underground gasification technologies for the coal are sufficiently utilized by the aid of technological processes for producing the chemical fertilizers and the intermediate chemical products from the integral synthetic gas, accordingly, the processing treatment and discharge costs in late periods can be reduced, and sales revenue of project products further can be increased.

Description

technical field [0001] The invention provides a process flow method for producing chemical fertilizers, intermediate chemical products and tail gas power generation by using gas from underground coal gasification products, and belongs to the technical field of downstream comprehensive utilization processes of underground coal gasification. Background technique [0002] Underground Coal Gasification (ISC) is a process of directly converting coal into product gas through the combustion and gasification reaction of underground coal seams with the help of oxidants. The product gas, often called syngas, can be used as a feedstock for downstream processes such as fuel production, chemical production, power generation, and more. This process integrates well construction and completion, underground coal mining and coal gasification technology, and has the advantages of good safety, small investment, high benefit and less pollution. [0003] Coal gasification process is the process ...

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Problems solved by technology

[0018] d) The quality of syngas products produced by the three different processes of air gasification, oxygen-enriched gasification and pure oxygen gasification in the underground coal gasification process is quite different, which directly affects the production processes and methods of downstream fertilizers and chemical products. Generalize

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