Method and equipment for synergistic removal of fine particles and SO3 through WFGD

Abstract

The invention discloses equipment for cooperatively synergistic removal of fine particles and SO3 through WFGD, belonging to the technical field of coal-fired flue gas treatment. According to main points of a technical scheme in the invention, the equipment comprises a desulfurizing tower, wherein a spraying layer, a plate type demister, a two-phase fluid spray gun, a heat exchanger and an efficient demister are sequentially arranged in the desulfurization tower from bottom to top; a flue gas inlet is formed in the side wall of the desulfurization tower and located below the spraying layer; and a flue gas outlet is formed in the top of the desulfurization tower. The invention further discloses a method for synergistic removal of fine particles and SO3 through WFGD. The method comprises thefollowing steps: S1, flue gas atomization; S2, preliminary demisting; S3, creation of a supersaturated water vapor environment; S4, impurity removal of a heat exchanger; and S5, final demisting. Theequipment and the method have the advantages that SO3 and submicron-grade and micron-grade fine particles in flue gas are removed more efficiently, the quality of purified flue gas is improved, and environmental protection is facilitated.

Description

technical field [0001] The invention relates to the technical field of coal-fired flue gas treatment, in particular to a method and equipment for FWGD collaborative removal of fine particles and SO3. Background technique [0002] As a country with large energy production and consumption, energy has always been a major issue closely related to people's livelihood. With the development and progress of the times, there are more and more ways to use renewable energy to generate electricity, such as hydropower plants and nuclear power plants. However, my country has a vast territory. In many areas in the central and western regions, the use of coal-fired power generation is still the main power generation method. The flue gas emitted by coal combustion contains a large amount of gaseous pollutants (such as SO x , NO x etc.), it also contains a large amount of aerosol pollutants (such as smoke, S0 3 acid mist, etc.). S0 3 It is an aerosol pollutant that exists in a small amou...

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Problems solved by technology

Physical agglomeration is mainly sonic agglomeration, the principle is to use sound waves to drive fine particles to collide and reunite, but there are disadvantages such as high energy consumption, high noise and low agglomeration efficiency; chemical agglomeration is to use agglomerating agents to make fine particles reunite and grow, but currently There is no cheap and efficient agglomerating agent, not large-scale industrial production

[0006] At present, the mainstream of flue gas treatment is the wet desulfurization system (FWGD). While FWGD has a high removal efficiency for SO2 in the flue gas, it also has a certain removal efficiency for fine particles and SO3 in the flue gas, but SO3 After entering the desulfurization tower, submicron and micron-scale aerosols are formed, which have the characteristics of low concentration and small particle size, which are difficult to remove by conventional desulfurization towers, and the removal efficiency of conventional desulfurization towers for submicron fine particles is also low

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