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Method and device for spray of agglomerator solution by electric dust collector to promote PM2.5 removal

A technology of electrostatic precipitator and agglomeration agent, which is applied in the direction of chemical instruments and methods, electrostatic effect separation, solid separation, etc. It can solve the problems that cannot effectively target PM2.5 in flue gas, and achieve the effect of increasing the growth of reunion, enhancing efficiency, The effect of increasing dwell time

Inactive Publication Date: 2015-07-08
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Claims
  • Application Information

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Problems solved by technology

However, before electrostatic precipitation, the dust particles in the flue gas are mainly coarse dust with a particle size greater than 2.5 μm. Most of the agglomerating agent solutions act on the coarse dust that does not need to be adjusted for agglomeration and growth pretreatment, and cannot effectively target the dust in the flue gas. PM 2.5 ; At the same time, the current chemical agglomeration technology fails to effectively combine the technical characteristics of low and low temperature electrostatic precipitators

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  • Method and device for spray of agglomerator solution by electric dust collector to promote PM2.5 removal

Examples

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Embodiment 1

[0042] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 300Nm 3 / h, using a wire-plate electrostatic precipitator; the mass percentage of the agglomerating agent solution is composed of: 0.05% pectin, 0.005% sodium dioctyl succinate sulfonate, and the remaining industrial water at a temperature of about 45°C. Spray agglomerating agent solution droplets with a temperature of 45°C and a particle size of about 20-30 μm in the final electric field of the electrostatic precipitator through a two-fluid atomizing nozzle, and the injection volume is 0.1kg / Nm 3 For the flue gas, the agglomerating agent solution accounts for about 0.2% of the dust mass, the temperature of the flue gas at the injection point is about 135°C, and the residence time is about 0.5s. Under the action of high-temperature flue gas, the droplets of agglomerating agent solution evaporate rapidly and interact with fine particles to promote their agglomeration and removal. A...

Embodiment 2

[0044] The composition of the agglomerating agent solution is: 0.1% guar gum, 0.01% water-based silicone wetting agent, and the rest is industrial water; the injection amount of the agglomerating agent solution is 0.07kg / Nm 3 The flue gas, wherein the agglomerating agent solution accounts for about 0.23% of the dust mass, and the flue gas temperature at the injection point is about 126°C; the rest are the same as in Example 1. As measured by the Vaisala-HMT337 temperature and humidity transmitter, the moisture content of the flue gas at the outlet of the electrostatic precipitator increased from 6.45% to 10.35%, the temperature of the flue gas dropped to 106°C, and the droplets of the atomized agglomerating agent solution could be completely evaporated. Real-time on-line measurement with the electric low-voltage impactor ELPI, after adding the agglomerating agent solution, the PM at the outlet of the electrostatic precipitator 2.5 Mass concentration from 10mg / m 3 to 6.5 mg / m ...

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Abstract

The invention discloses a method for spray of an agglomerator solution by an electric dust collector final stage electric field to promote PM2.5 removal. The method specifically includes: after removal of coarse particles in a preceding stage electric field, spraying an agglomerator solution prepared from a high polymer binder and a wetting agent into an electric dust collector final stage electric field, utilizing the heat contained in flue gas to evaporate the agglomerator solution, with the wetting agent promoting dust to enter agglomerator solution liquid drops in the evaporation process; and connecting the high polymer binder with PM2.5 through a polar group equipped polymer chain, promoting increase of the PM2.5 particle size so as to be in favor of electric dust collector trapping and reduction of reentrainment. The invention also relates to a device specifically for the method. The agglomerator solution is sprayed into the electric dust collector final stage electric field to mainly agglomerate PM2.5 fine particles that are difficult to remove, reduce the interference of coarse dust to PM2.5 agglomeration and enhance the PM2.5 agglomeration and growth effect. At the same time, evaporation of agglomerator solution liquid drops can reach the purposes of flue gas humidification and conditioning.

Description

technical field [0001] The invention relates to a method of spraying an agglomerating agent solution on an electrostatic precipitator to promote PM 2.5 The removal method is used to enhance the electrostatic precipitator for fine particulate matter (PM 2.5 ) removal efficiency. The present invention also relates to spraying agglomerating agent solution to promote PM in electrostatic precipitator specially for said method 2.5 Remove device. Background technique [0002] PM with an aerodynamic diameter less than 2.5 μm 2.5 Pollution has become a prominent atmospheric environmental problem in my country, and it is an important factor leading to major environmental problems such as reduced atmospheric visibility, acid rain, haze weather, and global climate change; the main reason is PM 2.5 Large specific surface area, easy to enrich various heavy metals and chemical carcinogens. However, conventional dust removal technology is difficult to effectively capture it, resulting ...

Claims

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Application Information

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IPC IPC(8): B03C3/013
Inventor 刘亚明徐齐胜杨林军袁竹林湛志钢许凯
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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