Flue gas white removal system and method based on partial organic Rankine cycle

Abstract

The invention relates to the technical field of energy environmental protection, and in particular to a flue gas white removal system and method based on partial organic Rankine cycle. The flue gas white removal system based on partial organic Rankine cycle comprises an electric bag dust remover, an induced draft fan, a waste heat recovery stage of a flue gas multi-stage deep cooling system, a desulfurizing tower and a wet electrostatic dust collector, wherein an inlet of the induced draft fan is connected with an outlet of the electric bag dust remover through a flue; an inlet of the waste heat recovery stage of the flue gas multi-stage deep cooling system is connected with an outlet of the induced draft fan through a flue; an inlet of the desulfurizing tower is connected with an outlet of the waste heat recovery stage of the flue gas multi-stage deep cooling system through a flue; and an inlet of the wet electrostatic dust collector is connected with an outlet of the desulfurizing tower through a flue. Through circulation of a working medium in the flue gas multi-stage deep cooling system and a flue gas heating system, high-efficiency recovery of flue gas waste heat is achieved,and the waste heat is directly used for flue gas heating to increase the lifting force of flue gas; and meanwhile, through deep cooling of the smoke, the white smoke plume phenomenon is thoroughly eliminated, and smoke condensate water is recycled.

Description

technical field [0001] The invention relates to the technical field of energy and environmental protection, in particular to a flue gas dewhitening system and method based on a partial organic Rankine cycle. Background technique [0002] At present, the flue gas treatment in the coal-fired power generation industry basically adopts ultra-low emission technology, and the mainstream desulfurization process in ultra-low emission technology is the limestone-gypsum desulfurization + wet electrostatic precipitator process. The desulfurization process mainly uses the slurry sprayed in the desulfurization tower to wash SO2 and other pollutants in the flue gas. Inside the tower, the flue gas temperature will drop to 45-55°C. The removal method of washing makes the net flue gas carry a very large amount of water after the pollutants are removed. At the same time, in order to improve the dust removal efficiency, the electrode surface in the wet electrostatic precipitator is covered w...

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Problems solved by technology

[0004] The direct discharge of these wet saturated flue gases will mainly cause the following two problems: (1) The temperature of the wet flue gas is low, and the height of the flue gas rise is low, which is not conducive to the diffusion of the flue gas; (2) The flue gas is white or off-white after being discharged , affecting people's vision and causing troubles to surrounding residents

[0006] The existing flue gas heating methods are divided into two types: one is the direct mixed heating method, that is, the method of directly mixing high-temperature flue gas or hot air with the clean flue gas after desulfurization and dust removal, and this method needs to consume a lot of clean fuel or A large increase in the burden on boiler auxiliary equipment; the other is that the high-temperature flue gas or steam before desulfurization heats the low-temperature wet flue gas through a regenerative or tubular heat exchanger, or condenses and then heats, and such methods are common in the market There are many problems such as high energy consumption, complex system, unstable operation of equipment, unsatisfactory whitening effect, etc.

[0007] In short, the existing flue gas de-whitening technology generally has problems such as incomplete de-whitening and poor stability, and it is impossible to take into account energy saving while ensuring environmental protection and emissions

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