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A system and method for deep removal of fine particles/soluble salts/sulfur trioxide in flue gas after wet desulfurization

A technology of sulfur trioxide and wet desulfurization, which is applied in chemical instruments and methods, separation methods, steam flow control, etc., can solve the problems of flue gas acid dew point rise, corrosion of downstream equipment, difficult capture, etc., to promote condensation And grow up, enhance the effect of collision and merging

Active Publication Date: 2021-07-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in coal-fired power plants, a certain amount of sulfur trioxide will be produced after boiler combustion and flue gas are catalyzed by the SCR system. Since sulfur trioxide is easily combined with water to form sulfuric acid aerosol, it is highly toxic and will Increase the acid dew point of flue gas, corrode downstream equipment, and produce "blue feather" phenomenon, which has great harm to the ecological environment and human health
These soluble salt particles and sulfur trioxide aerosol are difficult to capture because of their small particle size, and they will also be discharged into the flue gas after the wet desulfurization system to cause air pollution
[0004] The fine particles discharged after wet desulfurization are complex in composition and small in particle size. Even if the current wet electrostatic precipitator (WESP) with better removal effect is used, its removal efficiency for ultrafine particles and sulfur trioxide is only 70%. % and about 50%, it is also unable to control the emission concentration of fine particles after wet desulfurization, so it is necessary to develop a method for the deep removal of fine particles / soluble salts / sulfur trioxide in flue gas after wet desulfurization technology to ensure that coal-fired power plants meet emission standards

Method used

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  • A system and method for deep removal of fine particles/soluble salts/sulfur trioxide in flue gas after wet desulfurization
  • A system and method for deep removal of fine particles/soluble salts/sulfur trioxide in flue gas after wet desulfurization

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Embodiment 1

[0035] A system for deep removal of fine particles / soluble salts / sulfur trioxide in flue gas after wet desulfurization, the system includes a coagulation and growth system 1, and the coagulation and growth system 1 includes a square cross section Housing 2, atomization device, high-voltage pulse charging device, high-frequency alternating current coagulation device, turbulent flow agglomeration device; the left side of the housing 2 is the smoke inlet, and the right side is the smoke outlet, and the cross-sectional size can be determined according to the actual smoke The gas flow rate is determined by making the smoke flow rate inside the shell 2~3m / s, the smoke inlet and the smoke outlet are both in the shape of a bell mouth, and the small mouth is facing outward; the inner cavity of the shell 2 is from left to right In turn, it is divided into low-temperature cooling water atomization area, high-voltage pulse charging area, high-frequency alternating current coagulation area,...

Embodiment 2

[0050] The dusty flue gas is produced by the coal-fired boiler, and the flue gas velocity in the flue is 12m / s. After the boiler is running stably, add a certain amount of fly ash and sulfur trioxide to the flue gas to simulate the flue gas generated by the combustion of the actual power plant to ensure the concentration of fine particles, soluble salts and sulfur trioxide aerosols required for the test. The simulated flue gas is desulfurized by the wet desulfurization system (wet desulfurization tower) and then discharged, and relevant tests are carried out on the discharged flue gas, and the electric low-voltage impactor ELPI is used to test the PM online. 2.5 Concentration and particle size distribution, using the high temperature condensation method to test the concentration of sulfur trioxide after wet desulfurization, using a smoke sampler to sample the total dust in the flue gas after desulfurization, and using an ion chromatograph to measure the concentration of sulfur ...

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Abstract

The invention discloses a system and method for deep removal of fine particles / soluble salts / sulfur trioxide in flue gas after wet desulfurization. The system includes a coagulation and growth system and a wet electric dust collector. After the wet desulfurization system, particles such as fine particles, soluble salts and sulfur trioxide aerosol in the flue gas pass through the low-temperature cooling water atomization zone, high-voltage pulse charging zone, and high-frequency AC coagulation zone in sequence in the coagulation growth system. and turbulent flow regions. During this process, all kinds of particles in the flue gas are coagulated and grow up through the coupling effect of phase change coagulation, high-voltage pulse charging, high-frequency alternating current coagulation and turbulent agglomeration, and finally enter the wet electrostatic precipitator to be captured. In this way, the efficient removal of fine particles, soluble salt particles and sulfur trioxide aerosol after wet desulfurization can be realized.

Description

technical field [0001] The invention relates to a system and method for deep removal of fine particles / soluble salts / sulfur trioxide in flue gas after wet desulfurization, and belongs to the technical field of air pollutant control. Background technique [0002] my country is a country that uses coal as its main energy source. A large amount of coal combustion will produce a variety of air pollutants, among which nitrogen oxides, fine particles and sulfur dioxide are the main pollutants. At present, the three main pollutants are removed by selective catalytic reduction (SCR), electrostatic precipitator (ESP) and wet desulfurization (WFGD) respectively in most coal-fired power plants. However, with the requirements of ultra-low emission transformation for reducing pollutant discharge limits and the promulgation of relevant national standards, the emission concentration of smoke and dust is required to be lower than 5mg / m 3 However, purely relying on the traditional three kin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C3/017B03C3/014B03C3/02B03C3/08B03C3/47B03C3/66B03C3/36B01D51/02
Inventor 杨林军孙宗康周磊申奥吴新
Owner SOUTHEAST UNIV