Device and method for flue gas cleaning by combining impact agglomeration wet dust collector with wet electric dust collector

Abstract

The invention discloses a device and method for flue gas cleaning by combining an impact agglomeration wet dust collector with a wet electric dust collector. Specifically, the impact agglomeration wet dust collector and a gas-flow uniform distributing device are arranged under the tube-type wet electric dust collector, and the whole device is composed of a two-way gas-intake pipeline, an impact chamber, an efficient demister, a gas-flow uniform distributing plate, the wet electric dust collector, an alkali liquor pool, a precipitation liquor pool, a mixed liquor pool and the like. Flue gas processed through wet desulphurization impacts the liquor level in the impact chamber under the wet electric dust collector and arouses a large amount of water mist; meanwhile, two strands of the flue gas with the water mist is fully impacted and mixed over the liquor level, agglomeration growth of submicron fine particulate matter in the flue gas is facilitated, and precleaning of the flue gas is achieved. According to the device and method, the mode of combining the impact agglomeration wet dust collector with the wet electric dust collector is adopted, the problem that a traditional wet electric dust collector is lower in removing efficiency of the submicron fine particulate matter, and deep cleaning of the flue gas processed through wet desulphurization is achieved.

Description

1. Technical field [0001] The invention relates to a device and method for high-efficiency wet composite dedusting of flue gas after wet desulfurization, and belongs to the technical field of air pollution control. 2. Background technology [0002] At present, coal-fired power plants are atmospheric PM 2.5 The main source, while coal-fired power plants also emit PM 10 , acid mist, heavy metals, desulfurization slurry droplets and other pollutants not only increase the operating cost of the power plant, but also cause serious harm to human beings and the natural environment. In order to cope with the increasingly serious air pollution situation, the "Emission Standards of Air Pollutants for Thermal Power Plants" issued in 2011 set a 30mg / m for smoke and dust in thermal power plants 3 In 2014, domestic thermal power enterprises proposed "ultra-low emission". [0003] For the removal equipment of smoke and dust particles, there are mainly conventional electrostatic precipita...

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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to overcome the deficiency that the current wet electricity technology cannot effectively remove submicron fine particles, and provide a device and method for purifying flue gas combined with an impact condensing wet dust collector and wet electricity. The device has a compact structure and can Effectively improve the removal efficiency of submicron fine particles of 0.1 μm to 1 μm, and at the same time effectively promote the synergistic removal of various pollutants after wet desulfurization

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