Dedusting, desulfuration and waste-heat utilization integrated system with low PM2.5 emission

Abstract

The invention discloses a dedusting, desulfuration and waste-heat utilization integrated system with low PM2.5 emission. The system is composed of a boiler rear smoke channel, an air pre-heater, smoke-water heat exchangers, dust extraction devices, a desulphurization device, a low pressure heat regenerative system and a chimney. The outlet of the air pre-heater of the system is connected with the first-level smoke-water heat exchanger, after smoke is cooled through the heat exchanger, large solid particles carried in the smoke are removed through the first-level dust extraction device, then the smoke enters the second-level smoke-water heat exchanger through an induced draft fan and a booster fan to heat a part of power plant condensed water, and finally the smoke enters the desulphurization device. The outlet of the desulphurization device of the system is connected with the third-level smoke-water heat exchanger, after the smoke is heated up, the smoke enters the second-level dust extraction device to remove plaster particles, and finally the smoke is discharged to the atmosphere through the chimney. The dedusting, desulfuration and waste-heat utilization integrated system with the low PM2.5 emission can prevent the phenomenon of plaster rain of coal-fired power plants from occurring, can effectively reduce the emission load of PM2.5 of coal-fired power plants, and has the advantages of being simple in structure, mature in equipment technology and good in dedusting effect.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction, and in particular relates to an integrated system of dust removal-desulfurization-waste heat utilization with low PM2.5 emission. Background technique [0002] In recent years, the problem of atmospheric environmental pollution has attracted more and more attention. Coal-fired power stations are the main source of air pollutants in my country. Therefore, my country has formulated strict emission standards for coal-fired pollutants. Coal-fired power plants are equipped with dust removal and desulfurization devices, most of which use electrostatic dust removal and wet flue gas desulfurization processes. The flue gas after the air preheater of the power plant passes through the electrostatic precipitator to remove the dust, and the temperature of the flue gas after passing through the electrostatic precipitator can reach 120-130°C. Such a high temperature flue gas will g...

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Problems solved by technology

[0003] At present, the main means of preventing "gypsum rain" in power plants is to arrange a wet dust collector after the wet desulfurization device, and use the wet dust collector to remove fine particles in the flue gas after desulfurization. Although this method can achieve a better capture effect , but the humidity of the flue gas at the outlet of the dust collector is relatively high, which is easy to cause corrosion to the chimney, and there are disadvantages such as expensive equipment and immature technology

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