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Chemical agglomeration wet desulphurization device for reducing generation of fine particles

A technology of chemical agglomeration and wet desulfurization, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of low cost, high investment and operation costs, and difficult practical stages, so as to improve capture, investment and operation. Low cost, effect of changing growth habit

Inactive Publication Date: 2020-10-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of dust removal facilities such as electric bags, cloth bags, and new electrostatic precipitators can only reduce the concentration of fine particles entering the wet desulfurization tower, but is powerless to the fine particles formed during the WFGD process; although wet electrostatic precipitators installed downstream of the WFGD system can effectively remove desulfurization Fine particles in the net flue gas, but due to the high investment and operation costs, it is difficult to enter the comprehensive practical stage

Method used

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  • Chemical agglomeration wet desulphurization device for reducing generation of fine particles

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 The chemical agglomeration wet desulfurization device shown to reduce the generation of fine particles includes:

[0020] A desulfurization tower 1, the bottom of the desulfurization tower 1 is equipped with a desulfurization slurry 2, and a flue gas inlet 3 is provided at the same time, and a spray assembly 4 is provided at a position above the flue gas inlet 3 in the desulfurization tower 1, and the spray assembly 4 In order to arrange multi-layer spray heads at intervals from bottom to top, the spray assembly 4 communicates with the desulfurization slurry 2 through the slurry circulation pump 5, and a first demister 6 is arranged above the spray assembly 4, and the spray assembly 4 The desulfurization slurry 2 is dispersed and circulated inside the desulfurization tower 1 under the action of the slurry circulation pump 5 to desulfurize the flue gas. discharge.

[0021] The reunion liquid container 7 is communicated with the desulfurization tower 1 ...

Embodiment 2

[0027] The other parameters of the above method remain unchanged. The agglomerating agent is polyaluminum iron silicate, and the addition amount is 0.5g per L of desulfurization slurry. The wetting agent is sodium dodecylbenzenesulfonate, and the addition amount is 0.05g per L of desulfurization slurry. The desulfurization slurry temperature is 35°C, and the desulfurization liquid-gas ratio is 12L / m 3 . After the system is stable, use the electric low-pressure impactor ELPI to test online, and the mass concentration of fine particles in the net flue gas at the outlet of the desulfurization tower is about 39.3mg / Nm 3 , the number concentration of fine particles is 1.5×10 7 1 / cm 3 .

Embodiment 3

[0029] The other parameters of the above-mentioned method remain unchanged, the agglomerating agent is selected from squash gum, chitosan, and sodium carboxymethyl cellulose, and the addition amount is 0.35g per L of desulfurization slurry, and the wetting agent is selected from sodium dodecylbenzenesulfonate. The amount of addition is 0.035g per L of desulfurization slurry, the temperature of desulfurization slurry is 40°C, and the desulfurization liquid-gas ratio is 18L / m 3 . After the system is stable, use the electric low-pressure impactor ELPI online test, and the mass concentration of fine particles in the net flue gas at the outlet of the desulfurization tower is about 37.5mg / Nm 3 , the number concentration of fine particles is 1.4×10 7 1 / cm 3 .

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Abstract

The invention discloses a chemical agglomeration wet desulphurization device for reducing generation of fine particles. The device comprises a desulfurization tower, wherein desulfurization slurry iscontained at the bottom of the desulfurization tower, a flue gas inlet is also arranged, and a spraying assembly is arranged at the position, located above the flue gas inlet, in the desulfurization tower, the spraying assembly is communicated with the desulfurization slurry through a slurry circulating pump, and a first demister is arranged above the spraying assembly; a agglomeration liquid container which is communicated with the desulfurization tower through an agglomeration liquid pump, the agglomeration liquid container is filled with agglomeration liquid, and the agglomeration liquid isinjected into the desulfurization slurry through the agglomeration liquid pump to be mixed. The device improves the capture of fine particles in inlet flue gas by desulfurization slurry, reduces thegeneration of fine particles in the desulfurization process, effectively solves the problem that fine particles are difficult to remove by upstream conventional dust removal equipment and the problemsof separation, entrainment and the like of fine particles in the wet desulfurization process, and effectively relieves the pressure of downstream equipment.

Description

technical field [0001] The invention relates to the technical field of flue gas emission control, in particular to a chemical agglomeration wet desulfurization device for reducing the generation of fine particles. Background technique [0002] Wet flue gas desulfurization (WFGD) has become the 2 More than 80% of large and medium-sized coal-fired power plants adopt wet flue gas desulfurization process, and the application of this process in coal-fired industrial boilers, sintering flue gas and other fields is also increasing day by day. There are two main factors that affect the concentration of fine particles in flue gas at the outlet of wet desulfurization. One is the fine particles carried by coal-fired flue gas into the wet desulfurization system. Although the total dust removal efficiency of the existing electrostatic precipitator can reach more than 99%, However, the removal efficiency of fine particles is not so high. Taking the number concentration as an example, the...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D47/06
CPCB01D47/06B01D53/504B01D53/78B01D2251/404B01D2251/604
Inventor 杨林军张亚平岳修鹏沈凯熊桂龙
Owner SOUTHEAST UNIV
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