Method and apparatus used for promoting PM2.5 removing in tray column wet flue gas desulphurization

A wet flue gas desulfurization and tray tower technology, which is applied to combined devices, separation methods, chemical instruments and methods, etc., can solve the problems of high steam consumption, low moisture content, and easy blockage of demisters, and achieves a high technological level. Simple, high-resistance effect
CN102430307AInactive Publication Date: 2012-05-02SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2012-05-02
Estimated Expiration
Not applicable · inactive patent

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Abstract

During a tray column wet flue gas desulphurization process, gas and liquid between column trays do not directly contact each other, and a moisture content of flue gas is relatively high. Aiming at the characteristics, the invention provides a method and an apparatus used for promoting PM2.5 removing. The method and the apparatus are provided based on a heterogeneous condensation principle. The apparatus is composed of a deduster, a tray column, and steam-jet nozzles arranged between the column trays of the tray column. The method comprises steps that: an appropriate amount of normal-pressure saturated steam is injected between the column trays, and an inlet gas-liquid temperature difference of the column is regulated in auxiliary, such that the flue gas is saturated between the column trays and during the contact process with a desulphurization solution on the column trays; the super-saturated vapor is subject to nucleation condensation with PM2.5 as condensation nuclei, and diffusiophoresis and thermophoresis effects are generated, such that the granularity and the mass of PM2.5 are increased; and PM2.5 is collected by the desulphurization solution on the column trays with high efficiency. The technology provided by the invention is simple. When an appropriate amount of steam is added between the column trays, and the inlet gas-liquid temperature difference of the column is regulated in auxiliary, the tray column wet flue gas desulphurization apparatus can be provided with a function for increasing the PM2.5 granularity and for removing PM2.5.
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Description

technical field

[0001] The invention belongs to a method for promoting PM in coal-fired flue gas 2.5 Removal technology, especially related to a plate tower wet flue gas desulfurization process using the principle of steam phase change to promote PM 2.5 Methods and devices for removal. Background technique

[0002] At present, although the total particulate matter control technology has reached a relatively high level in the world, for fine particulate matter (PM) with an aerodynamic diameter less than 2.5 microns 2.5 ) capture rate is low, resulting in a large amount of fine particles discharged into the atmosphere. Such as wet flue gas desulfurization (WFGD) system is difficult to capture PM 2.5 , but the removal efficiency of particles above 3-5 microns can reach more than 70-80%; 2.5 The removal effect of the WFGD system on respirable particulate matter (PM 10 ) has a removal efficiency of 74.5%, but PM 2.5 On the contrary, it increases (Volume 28 of Chinese Journa...

Claims

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