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Coal-mine-goaf-based carbon dioxide underground sealing method and system

A carbon dioxide, goaf technology, applied in biochemical equipment and methods, biochemical instruments, biochemical cleaning devices, etc., can solve the problems of water pollution, large energy consumption, overflow, etc., to avoid water pollution, reduce storage costs, To achieve the effect of reuse

Active Publication Date: 2015-10-07
CHINA SHENHUA ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current CCS technology mainly has the following problems: First, some experts and scholars believe that CCS is only the CO 2 mothballed, and does not really achieve CO 2 reduction, not part of the CO 2 emission reduction; secondly, CO 2 The capture and storage of high-purity CO 2 , CO emissions from general coal chemical industry and power plants 2 The tail gas does not meet the requirements of direct storage, and additional CO is required 2 The purification system or the transformation of the power plant, such as the use of IGCC power generation or oxygen-enriched combustion technology, will greatly increase the CO 2 The cost of capture; again, CO 2 Underground storage has the potential for spillage and its safety is debated
At present, the main problem of microalgae carbon fixation technology is: the concentration of microalgae in the culture water (aqueous solution) used for microalgae cultivation is low (generally no more than 1wt%), and it is necessary to add a large amount of flocculant to separate microalgae from water, which will lead to The water body is polluted; the microalgae after precipitation and separation still contain a large amount of water (more than 95wt%), and the oil in it needs to be fully dried before being extracted. This series of processes will consume a lot of energy, and the energy consumed is far greater than Deriving energy from oils derived from microalgae is not economically viable

Method used

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  • Coal-mine-goaf-based carbon dioxide underground sealing method and system
  • Coal-mine-goaf-based carbon dioxide underground sealing method and system

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Experimental program
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Embodiment

[0065] The flue gas of a power plant exchanges heat with the water drawn from the outlet of the underground confined space 1 formed in the goaf area of ​​a coal mine, and then mixes it with air at a ratio of 1:10 to obtain CO 2 The mixed gas with a concentration of about 2% and an oxygen concentration of about 19% is sent to the microalgae breeding unit 3 for microalgae propagation. When the concentration of microalgae in the algae-containing aqueous solution is greater than 5g / L, the algae-containing aqueous solution is injected into the underground confined space 1 through the water injection port 8. After being adsorbed and filtered by the falling rock mass 7 in the underground confined space 1, it is removed from the underground confined space 1 The aqueous solution coming out of the drainage port 9 basically does not contain microalgae, and the microalgae is mainly adsorbed in the falling rock mass 7 of the underground confined space 1, realizing the protection of CO 2 Fixed...

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Abstract

The invention discloses a coal-mine-goaf-based carbon dioxide underground sealing method, belonging to the field of carbon dioxide emission reduction. The method comprises the following steps: injecting a CO2 exhaust-air mixture into a microalgae culture unit as a CO2 source, injecting the algae-containing water solution into an underground sealed space which is formed by reconstructing a coal mine goaf, separating microalgae from the water solution, and drawing the water solution out of the underground sealed space as a water source of the microalgae culture unit. The invention also discloses a coal-mine-goaf-based carbon dioxide underground sealing system. The underground sealed space reconstructed from the coal mine goaf is utilized to implement separation between the microalgae and water, thereby avoiding the problems of water body pollution and low separation cost in the traditional microalgae culture which needs to add the flocculant. The microalgae are fixed into the underground sealed space, thereby avoiding the problem of high cost due to demands for constructing the injection well and monitoring well in the traditional CCS technique, avoiding the problem of CO2 leakage, and further implementing low-cost safe reliable emission reduction of CO2.

Description

Technical field [0001] The invention patent belongs to the field of carbon dioxide emission reduction, and particularly relates to a method and a storage system for underground carbon dioxide storage based on coal mined areas. Background technique [0002] The greenhouse gas effect is currently a common concern of all mankind, and the global warming caused by it has already had a significant impact on the natural ecosystem. How to effectively control and reduce the emission of carbon dioxide and other greenhouse gases while the economy and society continue to develop is a serious problem faced by all countries in the world. At present, my country has publicly committed to CO by 2030 2 Emissions will no longer increase, and develop effective low-cost CO 2 Emission reduction technology has become an urgent need. [0003] my country's resource endowment conditions of "rich coal, less oil and less gas" determine that coal's main energy status in my country will not change for a long t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12N1/12C12P5/02C12P3/00C12M1/107C12M1/04C12M1/02C12M1/00
CPCC12M21/02C12M21/04C12M23/58C12M29/00C12M41/18C12M47/02C12N1/12C12P3/00C12P5/023Y02E50/30
Inventor 董斌琦袁明田雁张晓煜曹志国张凯李井峰郝兴辉黄维沈亚东刘玉平
Owner CHINA SHENHUA ENERGY CO LTD
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