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

A technology for underground gasification and chemical products, applied in hydrogen/syngas production, chemical instruments and methods, preparation of organic compounds, etc. and emission costs, the effect of increasing sales revenue

Inactive Publication Date: 2017-05-17
中为(上海)化学有限公司
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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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  • Method for producing chemical fertilizers and intermediate chemical products by aid of underground gasification product gas of coal
  • Method for producing chemical fertilizers and intermediate chemical products by aid of underground gasification product gas of coal
  • Method for producing chemical fertilizers and intermediate chemical products by aid of underground gasification product gas of coal

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Embodiment Construction

[0066] The technical solutions of the present invention will be further explained and illustrated below in conjunction with the accompanying drawings.

[0067] figure 1 It is a block process flow chart of producing urea and intermediate chemical ammonia from underground coal gasification air gasification product gas. The UCG air gasification process requires an air compressor 1 to produce a high-pressure oxidant, air 2 (contains about 21 mole% oxygen). The air 2 is injected into the ISC underground gasifier 3 through the injection well to realize the air gasification of the underground coal seam. Nitrogen (about 78mole%) in the air, as an inert gas, does not participate in the underground coal gasification reaction, and exists in the syngas product after directly passing through the ISC underground gasifier 3. After the downstream synthesis gas treatment process, it enters the ammonia synthesis unit 20 together with the remaining hydrogen 19 in the synthesis gas to produce a...

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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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50C01B3/52C01C1/04C05C9/00C07C273/04
CPCC01B3/52C01B3/50C01B2203/0415C01B2203/044C01B2203/0445C01C1/04C05C9/00C07C273/04
Inventor 卡斯珀·扬·亨德利克·伯格闵振华汪原理
Owner 中为(上海)化学有限公司
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