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Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method

A technology for desulfurization wastewater and agglomeration agent, which is applied in chemical instruments and methods, combined devices, separation methods, etc., can solve the problems of complex desulfurization wastewater treatment technology system and high cost, and achieves reduction of secondary dust, economical price, and reduced water consumption. Effect

Inactive Publication Date: 2012-03-21
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the method of chemical dosing is used for treatment. This method is mature, but the system is complex and requires a large amount of chemical agents, and the investment and operation costs are relatively high.

Method used

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  • Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method
  • Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 150Nm 3 / h, using limestone / gypsum wet flue gas desulfurization process; the mass percentage of agglomerating agent solution is composed of: 0.05% polyferric sulfate, 0.005% polyether modified silicone, and the rest is from the temperature of the desulfurization test system at about 45 °C Desulfurization wastewater. Spray agglomerating agent droplets with a temperature of 45°C and a particle size of about 40-50 microns into the flue between the coal-fired boiler and the wet desulfurization tower through a two-fluid atomizing nozzle, and the injection volume is 0.01kg / Nm 3 For the flue gas, the agglomerating agent accounts for about 0.25% of the dust mass, the temperature of the flue gas at the injection point is about 131°C, and the residence time is about 1.0s. Under the action of high-temperature flue gas, the droplets of agglomerating agent evaporate rapidly and interact with f...

Embodiment 2

[0036] The composition of the agglomerating agent solution is: 0.025% sodium carboxymethyl cellulose, 0.005% ethoxylated polydimethylsiloxane, and the rest is desulfurization wastewater; the injection amount of the agglomerating agent solution is 0.01kg / Nm 3 For the flue gas, the agglomerating agent accounts for about 0.125% of the dust mass, and the temperature of the flue gas at the injection point is about 128°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 entrance of the desulfurization tower increased from 6.90% to 10.45%, the temperature of the flue gas dropped to 116°C, and the desulfurization wastewater could be completely evaporated before entering the desulfurization tower. After the online test of the electric low-pressure impactor ELPI, after adding the agglomerating agent, the PM at the inlet of the desulfurization tower 2.5 The number concentration was r...

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Abstract

The invention discloses a method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in an evaporation manner and a device of the method. The method particularly includes steps that agglomeration liquor prepared by desulfuration wastewater, high polymer adhesive and wetting agent is sprayed into an inlet flue of an electric precipitator and is evaporated by the aid of heat of flue gas, in an evaporation process, the wetting agent promotes dust to enter drops of the agglomeration liquor, the high polymer adhesive is connected with PM2.5 via a polymer chain with polar groups, the grain diameter of the PM2.5 is prompted to be enlarged, so that the PM2.5 can be gathered by the follow-up electric precipitator, the desulfuration wastewater is evaporated completely, suspended matters and dissolvable pollutants in the wastewater are converted into solid to be dissolved out, and the suspended matters and the dissolvable pollutants in the wastewater, together with dust in the flue gas, are gathered by the electric precipitator. The device consists of a boiler, an air preheater, the electric precipitator, a desulfurizing tower, a hydraulic cyclone, a desulfuration wastewater clarification tank and an agglomeration liquor preparation tank, and a double-fluid atomizing nozzle is arranged in the flue between the air preheater and the electric precipitator.

Description

technical field [0001] The invention belongs to coal-fired flue gas fine particulate matter (PM 2.5 ) The technical field of emission control, especially related to an application of chemical agglomeration technology to improve the performance of electrostatic precipitators on PM 2.5 The method and device for achieving the removal effect of desulfurization wastewater and synergistically realizing the evaporation treatment of desulfurization wastewater. Background technique [0002] PM with an aerodynamic diameter less than 2.5 microns 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, hazy weather, and global climate change; the main reason is that PM 2.5 The specific surface area is large, and it is easy to enrich various heavy metals and chemical carcinogens, but it is difficult to effectively capture them by conventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D50/00C02F9/10C02F1/16
Inventor 杨林军鲍静静熊桂龙赵汶
Owner SOUTHEAST UNIV
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