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Poly-generation technique for using coal gas and coke oven gas as raw materials

A coke oven gas and coal-to-gas technology, applied in the direction of gas fuel, combustible gas production, sustainable manufacturing/processing, etc., can solve the problems of waste of coal resources, emission loss, etc., to save investment, maximize the economy, and improve the economy sexual effect

Active Publication Date: 2009-09-23
中科潞安能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a large amount of carbon does not participate in the Fischer-Tropsch synthesis reaction, and the greenhouse gas CO 2 Emission loss, resulting in huge waste of coal resources

Method used

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  • Poly-generation technique for using coal gas and coke oven gas as raw materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the process of coal gasification, the coal is pre-treated and sprayed into the ash fusion gasification furnace at a temperature of 1000 ° C and a pressure of 1.0 MPa to chemically react with water vapor and pure oxygen from air separation to generate CO, H 2 , CO 2 、H 2 O and a small amount of CH 4 、H 2 Water gas with S, COS and other components. The water gas containing a small amount of dust and impurities is initially purified. Due to the dusty water gas from gasification, it still contains acid gas after being washed, dedusted and cooled by Venturi scrubber and carbon scrubber. In order to protect the compressor, the desulfurization method is also used. Make H 2 S content is less than 30mg / Nm 3 , the preliminary purified water gas is compressed to a pressure of 2.5MPa, and then deeply purified. Deep purification adopts polyethylene glycol dimethyl ether (NHD) method for desulfurization and decarburization. Removed H 2 S gas desulfurization recovery unit...

Embodiment 2

[0037] In the coal gasification process, the coal is pre-treated to make 65% coal water slurry and sprayed into the Texaco gasifier at a temperature of 1300 ° C and a pressure of 7.0 MPa to obtain pure oxygen with gasified water vapor and air separation. Carry out a chemical reaction to produce CO, H 2 , CO 2 、H 2 O and a small amount of CH 4 、H 2 Water gas with S, COS and other components. The gasified dusty water gas, after being washed, dedusted and cooled by Venturi scrubber and carbon washing tower, enters deep purification, in which low-temperature methanol washing process is used for desulfurization and decarbonization. Removed H 2 S gas desulfurization recovery unit recovers sulfur and removes CO 2 To urea synthesis. The deeply purified water gas, coke oven gas pressure swing adsorption hydrogen compressed to 2.0MPa pressure and the tail gas recycled after Fischer-Tropsch synthesis are mixed into fresh Fischer-Tropsch synthesis gas, H 2 S content is less than 0...

Embodiment 3

[0039] In the coal gasification process, the coal is pre-treated to make 65% coal-water slurry and sprayed into the Texaco gasifier at a temperature of 1450 ° C and a pressure of 6.0 MPa to form pure oxygen with gasified water vapor and air separation. Carry out a chemical reaction to produce CO, H 2 , CO 2 、H 2 O and a small amount of CH 4 、H 2 Water gas with S, COS and other components. The gasified dusty water gas, after being washed, dedusted and cooled by Venturi scrubber and carbon washing tower, enters deep purification, in which low-temperature methanol washing process is used for desulfurization and decarbonization. Removed H 2 S gas desulfurization recovery unit recovers sulfur and removes CO 2 To urea synthesis. The deeply purified water gas, coke oven gas pressure swing adsorption hydrogen compressed to 5.0MPa and the tail gas recycled after Fischer-Tropsch synthesis are mixed to form fresh Fischer-Tropsch synthesis gas, H 2 S content is less than 0.1ppm, h...

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Abstract

The invention relates to a poly-generation technique for using coal gas and coke oven gas as raw materials. The poly-generation technique comprises the following steps of: carrying out mixing on part of H2 prepared by purified water gas and coke oven gas through pressure swing adsorption and tail gas obtained by Fischer-Tropsch synthesis, carrying out Fischer-Tropsch synthesis and obtaining hydrocarbon mixture and tail gas. The CO2 separated from tail gas separate by first pressure swing adsorption enters a urea synthesis unit for reaction, the CO and the hydrogen respectively obtained by separation of second pressure swing adsorption and third pressure swing adsorption of the residual tail gas are circulated back to a Fischer-Tropsch synthesis unit for reaction; and the residual gases can be used for generating power or obtaining SNG by secondary condensation. The coke oven gas enters pressure swing adsorption after being purified and desulphurized so as to separate H2; wherein one part of H2 is used as supplementation of H2 needed by Fischer-Tropsch synthesis and the other part of H2 is mixed with N2 for ammonia synthesis so as to obtain synthetic ammonia; and the synthetic ammonia is mixed with CO2 obtained by the first condensation and CO2 separated from the Fischer-Tropsch synthesis for urea synthesis so as to obtain urea. The CO2 separated from the first condensation of desorption gas by pressure swing adsorption of the coke oven gas is used for urea synthesis; and the residual gases is treated by the second condensation to obtain SNG and mixed gas of CO and N2. The invention has no emission of greenhouse gases, uses richness in carbon and deficiency in hydrogen of the coal gas and the richness in hydrogen and deficiency in carbon of the coke oven gas to carry out complementation, realizes modulation of product structure by Fischer-Tropsch synthesis and improves the economical efficiency of the process of Fischer-Tropsch synthesis.

Description

technical field [0001] The invention belongs to a technology for cogeneration by using coke oven gas and coal gas as raw materials. Background technique [0002] As a fossil energy with high carbon emissions, coal's traditional direct combustion utilization and conversion technology can no longer meet the increasingly high economic and environmental requirements. Obtaining coal-based liquid fuels and high value-added chemicals through Fischer-Tropsch synthesis is a new industrial frontier in the field of coal chemical industry, with broad application prospects and economic benefits. Urea is currently the most used nitrogen fertilizer, and synthetic natural gas (SNG) is a relatively scarce clean fuel in my country (at present, domestic demand is strong and there is a large gap). This requires that economic benefits, environmental benefits and social benefits can be well coordinated in industrial planning and technology research and development, and product structure and corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10J3/00C10K1/00C10K1/02C10G2/00C07C273/04C07C275/06C10L3/08C01C1/04F02C6/18
CPCY02E20/18Y02P30/00
Inventor 孙予罕李德宝刘斌关志道孙志强贾丽涛侯博
Owner 中科潞安能源技术有限公司
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