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

Inactive Publication Date: 2012-05-02
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention patent with application number 200710132250.0 discloses a method of using steam phase change in wet flue gas desulfurization to promote PM 2.5 The removal method adopts two methods of adding steam to the flue gas at the tower inlet and the desulfurization and purification flue gas to make the flue gas supersaturated during the desulfurization washing process and the desulfurization and purification flue gas respectively; but due to the high temperature of the flue gas before desulfurization, The moisture content is low, and the flue gas needs to be supersaturated in the desulfurization washing process, and the steam consumption is high, especially the supersaturated water vapor in PM 2.5 When the surface condenses, it will also condense in the desulfurization liquid, thereby weakening the steam phase change effect; adding steam to the desulfurization and purification flue gas at the outlet of the tower needs to be equipped with high-efficiency demisters such as wire mesh, but this type of demister is easy to block. In WFGD In the process, most of the baffle plate demisters are used, which have a better trapping effect on particles of tens of microns, while PM 2.5 Difficult to condense particles of this size

Method used

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

Examples

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Embodiment 1

[0038] Promote PM in plate tower wet flue gas desulfurization of the present invention 2.5 The removal method is as figure 1 Shown: Coal-fired flue gas is removed by dust collector 1 to remove coarse dust with a particle size ≥ 2.5 microns, then enters the tower from the lower section 3 of the plate tower 2, and is sprayed out from the spray pipe 8 with the gas sent in by the circulating pump 11 The medium and low temperature desulfurization liquid is in countercurrent contact. After the coal-fired flue gas is in contact with the desulfurization liquid on several tray plates at the bottom tower section 51 of the middle tower section 5, the temperature of the flue gas drops from 100~150°C to 55~65°C, and the relative humidity increases to more than 70~80%. Then through the steam nozzle 4, an appropriate amount of normal-pressure saturated steam is injected into the middle tower section 5, that is, the upper tower section 52 of the desulfurization section, to make the flue gas...

Embodiment 2

[0041] Such as figure 2 As shown, the difference from Example 1 is that after the flue gas contacts the desulfurization liquid on the bottom 1~2 trays of the desulfurization section 5, the temperature of the flue gas drops from 100~150°C to below 70°C, and the relative humidity increases to 50~60%, inject appropriate amount of normal-pressure saturated steam into the tower section 51 at the bottom of the desulfurization section 5 to make the flue gas saturated. saturation, occurs in PM 2.5 It is the vapor phase change process of condensation nuclei, and produces diffusion and thermophoresis, so that PM 2.5 Congeal and grow and then be captured by the desulfurization liquid on the subsequent multiple trays; wherein, the temperature of the medium and low temperature desulfurization liquid must be lower than the temperature of the saturated flue gas entering the tray by more than 20°C; the rest is the same as in Example 1.

Embodiment 3

[0043] Such as image 3 As shown, the difference from Example 1 is that after the flue gas contacts the desulfurization liquid on the bottom 1~2 trays of the desulfurization section 5, the temperature of the flue gas drops from 100~150°C to below 70°C, and the relative humidity increases to 50~60%, at the bottom of the desulfurization section 5, the upper tower section injects an appropriate amount of saturated steam at normal pressure at the same time, so that the flue gas reaches saturation in the bottom tower section 51 and supersaturation in the upper tower section 52. The saturated flue gas in the bottom tower section 51 reaches supersaturation during the contact process with the medium and low temperature desulfurization liquid on the tray, making PM 2.5 The desulfurization liquid is condensed and grows up and is captured once by the desulfurization liquid on the tray where the bottom tower section 51 is located; the temperature of the medium and low temperature desulfur...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D50/00B01D53/78B01D53/48
Inventor 杨林军鲍静静熊桂龙
Owner SOUTHEAST UNIV
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