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Underground gasification coal derived energy chemical product poly-generation system and method

A technology for underground gasification and chemical products, applied in fuel system, petroleum industry, energy input, etc., can solve problems such as high cost and inability to reduce carbon dioxide, and achieve the effects of low cost, reduced production cost, and simple process

Active Publication Date: 2010-06-30
ENN SCI & TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although in view of the seriousness of the "greenhouse effect", European and American countries have begun to study coal-based near-zero emission polygeneration systems in recent years, but due to the stable chemical properties of carbon dioxide, they can only be solved by capturing and storing, which is costly and expensive. Cannot really reduce carbon dioxide in quantity, it is only a stopgap measure in the long run

Method used

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  • Underground gasification coal derived energy chemical product poly-generation system and method
  • Underground gasification coal derived energy chemical product poly-generation system and method
  • Underground gasification coal derived energy chemical product poly-generation system and method

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Embodiment 1

[0043] like image 3 As shown in the figure, the oxygen generated by electrolyzed water or algae carbon absorption matches the steam generated by the steam boiler, and is injected into the gasification channel of the underground gasifier in a certain proportion to contact the coal seam for oxidation, reduction, drying and retorting reactions, and generate carbon monoxide, carbon monoxide, Raw gas of hydrogen, carbon dioxide, methane, hydrogen sulfide and other gases. The production of combustible gas passes through three reaction zones in the gasification channel: oxidation zone, reduction zone and dry distillation zone. In the oxidation area, the oxygen in the gasification agent and the carbon in the coal seam undergo a heterogeneous chemical reaction, which generates a large amount of heat and makes the coal seam hot, and its temperature ranges from 900 to 1450 °C. Because in the gasification channel, oxygen contacts with coal, reacts quickly and is consumed. As long as th...

Embodiment 2

[0045] like Figure 4 As shown, the oxygen and water vapor generated by electrolysis of water or algae carbon absorption go through the first-stage oxygenation and oxidation exothermic reaction in the underground coal gasification, and then the hydrogen is injected into the underground coal gasification process to directly react with the coal char to generate a large amount of methane. And a small amount of hydrogen, carbon monoxide, carbon dioxide, oxygen and other gases, purified to obtain methane. The injected hydrogen can be partly derived from a small amount of hydrogen obtained from the gasification and separation of the first-stage oxygenated oxidation reaction output, and the insufficient part can be supplied by the electrolysis water system or algae photosynthesis. The carbon dioxide in the gasifier can be directly sent to the algae carbon absorption process for the production of biodiesel, or it can be stored in the cavity produced by the underground gasification, an...

Embodiment 3

[0047] like Figure 5 As shown, the purified syngas obtained by underground coal gasification has the components of methane, hydrogen and carbon monoxide after purification. After the refined synthesis gas is separated from methane, the remaining hydrogen and carbon monoxide can be directly methanated to prepare methane, and can also be sent to a multi-generation system to synthesize methanol, and the methanol can be further dehydrated to prepare dimethyl ether. The hydrogen-to-carbon ratio required for methanation or methanol synthesis can be adjusted by electrolysis of water and / or hydrogen produced by fermentation of algal residues produced by the algal carbon absorption system. In the multi-generation system, the slack gas generated after methanol synthesis can be used as gas for power generation, and part of the high-temperature steam generated in the underground gasification section can be used to drive the steam turbine to generate power. In addition, the methane synth...

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Abstract

The invention relates to an underground gasification coal derived energy chemical product poly-generation system and a method; by coupling the underground gasification coal and the traditional coal derived energy chemical product poly-generation system, the coal is converted into clean energy chemical product and / or clean electricity such as methane, and the renewable energy and renewable resources are led in the production process of the coal derived energy chemical products, the comprehensive utilization of waste water, waste gas and solid waste and near-zero emission of carbon dioxide are realized.

Description

technical field [0001] The invention relates to the field of energy and chemical industry, in particular to a technology for poly-generation of coal-based energy and chemical products based on an underground coal gasification process. The present invention also relates to a method for reducing carbon dioxide emissions in the above process, and a method for producing part of the raw material gas required by the process. Background technique [0002] In the world's primary energy consumption, coal is the fastest growing fuel and has surpassed oil and natural gas to achieve market share growth for many consecutive years. But coal is also the fossil fuel with the highest carbon content, and during the combustion and transformation process, it inevitably produces large amounts of greenhouse gases. The impact of greenhouse gas emissions on global climate change has attracted the world's attention. Therefore, it is urgent to solve the problem of greenhouse gas emissions while mini...

Claims

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Application Information

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IPC IPC(8): C10J3/86C10G1/00F01K11/02F01D15/10F02B43/00F02C6/00
CPCY02T10/32Y02E50/12Y02T10/16Y02E50/10Y02P20/133Y02T10/12Y02T10/30
Inventor 甘中学徐春保陈峰刘敏胜李金来
Owner ENN SCI & TECH DEV
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