System for recovering waste heat during dry capture of CO2 for thermal power stations and using waste heat for heat supply

A thermal power plant and dry process technology, applied in heating systems, hot water central heating systems, household heating, etc., can solve problems such as different carbon capture reaction temperatures, achieve high-efficiency utilization, reduce impacts, and reduce comprehensive The effect of energy consumption

Active Publication Date: 2018-10-19
SOUTHEAST UNIV
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Problems solved by technology

CN106215682A discloses a combination of calcium cycle capture CO 2 The method of combined heating, power and cooling triple generation system can realize the zero carbon emission of the triple generation system, and can simultaneously realize

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  • System for recovering waste heat during dry capture of CO2 for thermal power stations and using waste heat for heat supply

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[0025] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention but not to limit the scope of the present invention.

[0026] The system involved in the present invention is composed of a carbon capture unit and a steam extraction heat supply unit, and the two units are mainly coupled through the heat exchange between the heating network water and the carbonation reactor.

[0027] The carbon capture unit mainly consists of two parts: power generation subsystem 1 and carbon capture subsystem.

[0028] The flue gas generated by boiler combustion in power generation sub-system 1 is discharged into the atmosphere after passing through the flue gas treatment device, booster fan, carbonation reactor, preheater, cyclone separator, and flue gas heat exchanger;

[0029] The steam extracted by steam turbin...

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Abstract

The invention discloses a system for recovering waste heat during dry capture of CO2 for thermal power stations and using the waste heat for heat supply. The system comprises a carbon capture unit andan extraction steam heating unit. The invention adopts the low-temperature heat network backwater as the cooling medium for cooling the carbonation reactor in the carbon capture unit, and realizes the recycling of a large amount of low-grade heat released during the adsorption process; the regeneration gas at the outlet of the regenerative reactor is used to replace the low-temperature regenerator in the carbon capture unit to heat the condensed water, recover the cooling heat of the regeneration gas, and reduce the low-pressure extraction of the carbon capture unit; part of exhaust heat of steam turbines in the heating unit is recovered by the absorption heat pumps. The invention combines the advantages of low temperature dry capture CO2 technology and absorption heat transfer technologyto recover waste heat during carbon capture. At the same time, power generation, CO2 capture and central heating are realized, which is in line with the principle of energy cascade utilization, and the whole system has good economy.

Description

technical field [0001] The invention relates to a dry method for recovering CO from a thermal power plant 2 A system for using process waste heat for heat supply belongs to the technical field of carbon dioxide emission reduction and central heating. Background technique [0002] CO 2 A large amount of emissions is an important factor leading to global warming, and carbon capture and storage technology is considered to be the most effective measure to slow down global warming. Among them, dry process CO using alkali metal-based solid adsorbent 2 Capture technology can realize carbon dioxide capture at low temperature without problems such as equipment corrosion caused by wet method, and has the advantages of wet absorption and physical adsorption, so it has a good application prospect. [0003] Common alkali metal-based solid adsorbents include potassium-based solid adsorbents and sodium-based solid adsorbents. Potassium-based solid adsorbents have a faster reaction rate...

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Application Information

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IPC IPC(8): F24D3/02F24D3/18F01K19/00B01D53/62B01D53/81F01D15/10
CPCB01D53/62B01D53/81B01D2251/304F01D15/10F01K19/00F24D3/02F24D3/18F24D2200/126F24D2200/16Y02A50/20Y02B30/12Y02C20/40
Inventor 陈晓平谢玮祎梁财刘道银马吉亮
Owner SOUTHEAST UNIV
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