A system and method for water-vapor phase change coupled with low-temperature electrostatic precipitator to remove fine particles

Abstract

The invention discloses a system and a method for removing fine particles through water vapor phase change coupling low-low temperature electric dedusting and belongs to the technical field of smoke purification. The system comprises a denitration reactor, an air preheater, a heat recycling device, a low-low temperature electric deduster, a desulfurizing tower and a reheater in sequential connection, the denitration reactor is connected with a smoke outgoing flue of a boiler, the reheater is connected with a chimney, a phase change chamber is connected between the heat recycling device and theelectric deduster; the phase change chamber comprises a smoke inlet, a smoke outlet, a condensed water discharging port and a plurality of steam inlets, an atomizing nozzle is arranged on each steaminlet, a cyclone device is arranged in the phase change chamber and is in the shape of an inverted funnel, the steam inlets and the upper port of the cyclone device are in tangential circle arrangement, and the steam inlets are uniformly distributed around central axis of the phase change chamber. The phase change chamber and the low-low temperature electric deduster are coupled, so that charge removing efficiency of the electric deduster to the fine particles can be improved, and dust re-entrainment during rapping dust removal of the electric deduster is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, in particular to a system and method for removing fine particles by water vapor phase change coupled with low-temperature electric dust removal. Background technique [0002] The flue gas emitted by coal-fired power plants contains a large amount of fine particles, which is one of the main sources of particulate matter pollution in the atmospheric environment, and most of these particles contain toxic substances such as heavy metals. These particles are small in size, large in surface area, carry various heavy metals and have long transmission distances Fine particles can cause great harm to human health. Therefore, efficient removal of fine particles in power plants is required. [0003] The electrostatic precipitator has the advantages of high dust removal efficiency, low equipment resistance, large amount of flue gas treatment, low operating cost, less maintenance workload and n...

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Problems solved by technology

[0006] Aiming at the problems of low and low temperature electrostatic precipitator prone to secondary dust and poor dust removal performance in the prior art, the present invention provides a system and method for water vapor phase change coupled with low and low temperature electrostatic precipitator to remove fine particles, combining phase change chamber and The coupling of low and low temperature electrostatic precipitators, on the one hand, can increase the particle size of fine particles before they enter the inlet of the precipitator, and promote the charge removal efficiency of the fine particles by the electrostatic precipitator; on the other hand, due to the presence of water vapor on the particle surface, the The adhesion effect between the fine particles on the dust collection plate can reduce the secondary dust phenomenon when the electrostatic precipitator is vibrating and cleaning the dust, and improve the dust removal performance of the dust collector

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