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Device for cooperating evaporation of desulfurized wastewater flue and enhancing removal of fine particulates and SO3 (sulfur trioxide) and method thereof

A technology for desulfurization of wastewater and fine particles, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation to achieve the effects of promoting evaporation, achieving synergistic removal, and promoting absorption

Active Publication Date: 2018-08-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Technical problem: the present invention aims at the current situation that desulfurization wastewater is difficult to treat and the prior art cannot effectively remove PM 2.5 with SO 3 Insufficiency of the problem, provide a device and method for coordinating desulfurization wastewater flue evaporation and enhancing the removal of fine particulate matter and sulfur trioxide, effectively improving PM 2.5 with SO 3 The removal efficiency, so as to achieve PM 2.5 with SO 3 Synergistic removal and zero discharge of desulfurization wastewater

Method used

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  • Device for cooperating evaporation of desulfurized wastewater flue and enhancing removal of fine particulates and SO3 (sulfur trioxide) and method thereof
  • Device for cooperating evaporation of desulfurized wastewater flue and enhancing removal of fine particulates and SO3 (sulfur trioxide) and method thereof

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Embodiment 1

[0026] A device for coordinating desulfurization waste water flue evaporation and enhancing the removal of fine particles and sulfur trioxide, the device is installed on the flue of the boiler system, including desulfurization waste water storage tank 1, alkaline absorbent storage tank 2, injection system, production Vortex system and electrostatic precipitator 8, described injection system is made up of alkaline absorbent solution storage tank 3, metering pump 4, air compressor 5, two-fluid atomizing nozzle 6, wherein alkaline absorbent solution storage tank 3, metering The pump 4 and the two-fluid atomizing nozzle 6 are connected in sequence to form a liquid circuit, and the air compressor 5 is connected to the two-fluid atomizing nozzle 6 to form an air circuit; The distance between the nozzle 6 and the first-stage spoiler vortex is 1-3m, and the distance between the last-stage vortex and the entrance of the electrostatic precipitator 8 is 2-5m. Both the desulfurization was...

Embodiment 2

[0030] Dust-laden flue gas is produced by coal-fired boilers with a flue gas volume of 300Nm 3 / h, after the boiler runs stably, add a certain amount of fly ash and SO 3 , to ensure the required PM for testing 2.5 and SO 3 concentration. Before the method and device of the present invention are used, the flue gas directly enters the electrostatic precipitator, and the electric low-voltage impactor ELPI is used to test the PM online. 2.5 Concentration and particle size distribution, after testing, the PM at the inlet of the electrostatic precipitator 2.5 The particle size distribution is a typical bimodal distribution, the first peak appears at about 0.1um, and the number concentration is 7.1´10 6 / cm 3 , another peak appears at about 1um with a number concentration of 1.9´10 6 / cm 3 , PM 2.5 The mass concentration is 250mg / m 3 , with a number concentration of 1.5´10 7 / cm 3 ; PM at the outlet of electrostatic precipitator 2.5 The mass concentration is 30mg / m 3 , w...

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Abstract

The invention discloses a device for cooperating evaporation of a desulfurized wastewater flue and enhancing removal of fine particulates and SO3 (sulfur trioxide) and a method thereof. The device comprises a desulfurized wastewater storage tank, an alkaline adsorbent storage tank, a spraying system, an eddy production system and an electrostatic deduster. The device is characterized in that the coal flue gas in the flue is sprayed with an alkaline adsorbent solution prepared from the desulfurized wastewater, the PM2.5 (particulate matter 2.5) is in collide with the liquid droplets, the PM2.5in the flue gas is agglomerated along with the evaporation of the liquid droplets, and the particle size is increased; the liquid droplets are in contact with the SO3 in the flue gas, and are neutralized; the incompletely evaporated alkaline adsorbent liquid droplets and the flue gas are mixed, and flow through a turbulence field caused by flow disturbing eddy sheets, the liquid droplets used as agglomeration cores to severely collide with the PM2.5, the PM2.5 is further agglomerated and grown, the retention time of the flue gas is extended, the SO3 is promoted to generate neutralizing reaction with the alkaline adsorbent liquid droplets, and the agglomerated PM2.5 and the neutralized SO3 are removed by the electrostatic deduster; the cooperated removal of the PM2.5 and the SO3, and the zero-drainage of the desulfurized wastewater are realized.

Description

technical field [0001] The invention relates to a device and method for coordinating desulfurization waste water flue evaporation and enhancing the removal of fine particles and sulfur trioxide, and belongs to the technical field of air pollutant control. Background technique [0002] During the operation of coal-fired power plants, a large amount of gas, liquid and solid pollutants will be produced. With the improvement of pollutant discharge standards for thermal power plants, the requirements for various pollutant discharges have become more stringent. [0003] PM is the fine particulate matter with an aerodynamic diameter less than 2.5um produced during the coal combustion process of a power plant. 2.5 It has become a prominent atmospheric environmental problem in my country. At present, nearly 90% to 95% of coal-fired power plants in China use dry electrostatic precipitators, although their collection efficiency for coarse particles in coal-fired flue gas can reach 99...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/79B03C3/017B01D47/06
CPCB01D47/06B01D53/50B01D53/79B01D2258/0283B03C3/017
Inventor 杨林军孙宗康周磊申奥
Owner SOUTHEAST UNIV
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