Ultra-clean environment-friendly treatment island for tail gas of coal-fired boiler

Abstract

The invention discloses an ultra-clean environment-friendly treatment island for tail gas of a coal-fired boiler. A denitrification device is connected and arranged in front of a boiler preheater, anda waste heat absorption device, a dry type dust collector, a desulfurization device, an ultrasonic wave condensation device, a wet-type electric precipitator, a cooling MGGH and a heating MGGH are sequentially connected and arranged behind the boiler preheater, so that one dehumidification, desalination and desulfurization smoke treatment integrated mutual coupling system which completely and efficiently traps fine particles PM2.5 and aerosol is formed. The ultra-clean environment-friendly treatment island for the tail gas of the coal-fired boiler is reasonable in structure design and outstanding in using effect, especially special setting of the ultrasonic wave condensation device, the cooling MGGH and the heating MGGH respectively realize ultrasonic coagulation, agglomeration and growthas well as the dehumidification, desalination and desulfurization on the fine particles PM2.5 in smoke, and ultra-clean discharge of the smoke is realized while environmental protection cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection equipment systems, and in particular relates to an island system for ultra-clean environmental protection treatment of tail gas of a coal-fired boiler. Background technique [0002] Fog When there is sufficient water vapor, breeze and stable atmosphere, if the air close to the ground cools to a certain extent, the water vapor in the air will condense into fine water droplets suspended in the air, reducing the visibility at the ground level. The weather phenomenon is called fog. Haze, also known as haze, refers to the turbid phenomenon formed by the suspension of a large amount of smoke, dust and other particles. The core substance of haze is dust particles suspended in the air, including dust, sulfuric acid, nitric acid, organic hydrocarbons and other particles, which can The atmosphere is cloudy, blurring vision and causing visibility to deteriorate. Cause skin disease, asthma,...

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Problems solved by technology

[0004] The invention with the patent number 106940025A discloses a coal-fired boiler flue gas purification and waste heat recovery treatment system and method. To achieve denitrification, dust removal, desulfurization and waste heat utilization, the waste heat absorber is placed behind the dust removal device, and the specific resistance and temperature entering the dry dust collector cannot be reduced by cooling, and the performance of the dry dust collector cannot be improved. The dust of the dry dust collector The discharge easily exceeds the dust requirements of the lower-level desulfurization absorption tower, so that the slurry in the desulfurization absorption tower is polluted by dust and poisoned, and the desulfurization work cannot be carried out normally. On the other hand, the ultra-clean cooler and waste heat evaporator after the desulfurization absorption tower are easily adhered and bonded by the desulfurization slurry aerosol and fine dust in the flue gas after desulfurization, reducing its cooling and heating effects

[0005] The invention with the patent number 106334428A discloses a flue gas treatment system. The working principle is to realize denitration, dust removal and desulfurization mainly through the denitrification reaction device, the first electrostatic precipitator, the desulfurization device, the second electrostatic precipitator and the reducing agent injection device. , because the second electrostatic precipitator installed behind the desulfurization tower is a wet electrostatic precipitator, a single wet electrostatic precipitator cannot efficiently capture fine dust PM2.5, and there is no water-medium flue gas-smoke The gas heat exchange MGGH system cannot efficiently eliminate aerosols in the flue gas, and cannot achieve ultra-clean and environmentally friendly emissions

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