Method and device for removing PM2.5 (particulate matter) in WFGD (wet flue gas desulfurization) process

Abstract

The invention discloses a method and a device for removing PM2.5 (particulate matter) in a WFGD (wet flue gas desulfurization) process and solves the problems of difficulty in removing PM 2.5, complex process and the like in the conventional WFGD process. The technical scheme is as follows: boiler flue gas after dust removal by dust removal equipment enters a desulfurizing absorption tower is contacted reversely with a desulfurizing fluid ejected from a desulfurizing spraying layer at the middle section of the desulfurizing absorption tower and a flocculant fluid ejected from a flocculant atomized spraying layer for desulfurization, and PM 2.5 in the flue gas is removed after flocculation. The method and the device have the advantages of simple process, good PM 2.5 removal effect, energy saving, consumption reduction and low production cost and equipment investment cost.

Description

technical field [0001] The invention belongs to the technical field of fine particulate matter control in flue gas, in particular to a PM desulfurization process in wet desulfurization 2.5 Methods and devices for removal. Background technique [0002] At present, the backward trend of the overall deterioration of my country's environmental conditions has not been fundamentally curbed, environmental contradictions have become increasingly prominent, and the pressure on environmental protection has continued to increase. Atmospheric smog is prominent in some regions and cities. According to research data in 2005, PM directly emitted by coal-fired power plants 2.5 About the national PM 2.5 About 10% of the emissions, plus the secondary particulate matter produced by coal combustion, coal-fired power plants emit PM 2.5 accounted for national PM 2.5 The proportion will be even higher. [0003] In the traditional wet flue gas desulfurization (WFGD) process, on the one hand, ...

AI Technical Summary

Problems solved by technology

Therefore, the current common wet flue gas desulfurization projects in coal-fired power 2.5 The treatment effect is often poor

[0004] At present, the flue gas PM is controlled in the desulfurization process 2.5 There are mainly two ways to discharge: 1. Use steam phase change fine particles to condense and grow, such as "a method and device for removing fine particles in wet flue gas desulfurization", which consumes a certain amount of steam, and at the same time the steam phase change 2. Reduce the generation of ammonium sulfate particles by reducing the inlet flue gas temperature, such as "an effective method to reduce the generation of ammonium sulfate particles in ammonia desulfurization" , this method has a certain effect on reducing the generation of ammonium sulfate particles, but has no obvious effect on the removal of coal-fired ultrafine particles

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