Flue gas purification system capable of comprehensively utilizing heat and process thereof

Abstract

The invention discloses a flue gas purification system capable of comprehensively utilizing heat and a process thereof, wherein the flue gas purification system capable of comprehensively utilizing heat comprises a COAP system, a CO2 chemical absorption system, a regeneration tower, a steam heat utilization pipeline system, a regenerated gas discharge pipe and a steam recovery pipe; the COAP system comprises a desulfurization adsorption tower, a refrigerator and a denitration adsorption tower which are communicated in sequence; a gas inlet of the CO2 chemical absorption system is communicated with a gas outlet of the COAP system; a reboiler is arranged at the bottom of the regeneration tower; the steam heat utilization pipeline system comprises a high-temperature steam conveying pipe which is communicated with a regeneration gas inlet of the desulfurization adsorption tower and / or the denitration adsorption tower; one end of the regenerated gas discharge pipe is communicated with a regenerated gas outlet of the desulfurization adsorption tower and / or the denitration adsorption tower, and the other end of the regenerated gas discharge pipe is communicated with a gas inlet of the reboiler; and one end of the steam recovery pipe is communicated with the gas outlet of the reboiler. The flue gas treated by the COAP system and the CO2 chemical absorption system in a combined manner can achieve the purposes of environmental protection and dual carbon, the requirement of flue gas emptying is met, and heat of the flue gas exhausted by the COAP system can be utilized step by step and is utilized more sufficiently.

Description

technical field [0001] The invention relates to the technical field of energy recovery in power plants, in particular to a flue gas purification system for comprehensive utilization of heat and a process thereof. Background technique [0002] Low temperature integrated pollutant removal technology (abbreviation: COAP technology) is a comprehensive treatment technology for flue gas pollutants. 2 and residual moisture, while also adsorbing SO 3 , Hg, HCl, HF, VOCs and a small amount of NOx; the flue gas after desulfurization and dehumidification is cooled to the sub-zero temperature area, and then enters the low-temperature denitrification adsorption tower, where NOx is deeply adsorbed and removed at low temperature to achieve the integrated removal of pollutants. ' and 'near-zero emissions' two goals. For example: Chinese patent CN110743312A discloses a flue gas low-temperature adsorption denitration system and process, which is a transformative technology for realizing coa...

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Problems solved by technology

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problems of using COAP technology and CO in the prior art. 2 When the chemical absorption system is used in combination, the system setting is complicated and the heat utilization rate is low, so as to provide a flue gas purification system and its process for comprehensive utilization of heat to solve the above problems

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