Recovery of thermal power plant dry capture co 2 Systems where process waste heat is used for heating

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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Problems solved by technology

CN106215682A discloses a combination of calcium cycle capture CO 2 The method of combined heat, power and cooling triple generation system has realized the zero carbon emission of the triple generation system, and can simultaneously realize heating, cooling, power generation, CO 2 capture and other benefits, but the method is aimed at calcium cycle capture rather than alkali metal-based sorbent dry capture, and the carbon capture reaction temperature is different between the two

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