A high-efficiency wet electrostatic precipitator purification device and method for flue gas after wet desulfurization

Abstract

The invention discloses an efficient wet type electric dedusting and purifying device and method for smoke obtained after wet desulphurization. The device comprises a gas inlet, a heat exchange pipe, multiple humidifying nozzles, a cathode fixing frame, multiple dust collecting pipes, multiple washing nozzles and a gas outlet, which are arranged in a shell in sequence from bottom to top, wherein the upper ends and the lower ends of the dust collecting pipes are connected with an upper tube sheet and a lower tube sheet in a sealing manner, respectively, so as to form a dust collecting pipe bundle; multiple discharge electrode wires are arranged in the dust collecting pipes respectively and are fixed by the cathode fixing frame; the cathode fixing frame is connected with a high-voltage power source outside the shell; when the smoke obtained after wet desulphurization is purified, the smoke is introduced into the device from the gas inlet, is cooled through the heat exchange pipe and is humidified and cooled through spraying of the humidifying nozzles, so as to reach a saturated or oversaturated water vapor state; when the smoke passes through the dust collecting pipes, water vapor condensation phase change occurs; particulates are collected to the inner surfaces of the dust collecting pipes under the action of an electric field force. The efficient wet type electric dedusting and purifying device integrates water vapor condensation phase change and wet type electric dedusting, so that the deep purification effect of the smoke obtained after wet desulphurization can be realized.

Description

technical field [0001] The invention relates to a high-efficiency wet electric dust removal device and method for flue gas after wet desulfurization, and belongs to the technical field of air pollution control. Background technique [0002] At present, the flue gas desulfurization of coal-fired boilers mainly adopts wet desulfurization technology. During the operation of the wet desulfurization system, it is inevitable to produce SO 3 Acid mist, slurry drop aerosol, or ammonia salt aerosol and other PM 2.5 , causing serious harm to human health and the environment; the cost of anticorrosion of follow-up equipment will increase accordingly. [0003] Early wet desulfurization systems, such as limestone-gypsum process systems, are generally equipped with a flue gas heat exchanger (GGH) to heat the clean flue gas after desulfurization, increase the height of the flue gas lift, and facilitate the diffusion of the flue gas, effectively avoiding "gypsum rain" phenomenon. Howeve...

AI Technical Summary

Problems solved by technology

However, the traditional wet electrostatic precipitator has low capture efficiency for particles in the submicron (≤1μm) particle size range, and has limited removal ability for condensed particles (precursors of haze)

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