Pulse electric field activated dry-type calcium-spraying flue gas desulfurization method and apparatus

Abstract

The invention relates to a pulsed electric field dry type calcium-spraying flue gas desulfurization method and a device, which belong to the technical field of environmental engineering. In the method, Ca(OH)2 is used as a desulphurizer, is sprayed into a flue gas conveying pipe (in front of the second level dust collector) behind the first level dust collector at a high speed in a spraying unit and is mixed with the flue gas containing SO2; under the action of a high pressure pulsed electric field applied in the flue gas conveying pipe, the Ca(OH)2 reacts with the SO2 in the flue gas to generate CaSO3 and small amount of CaSO4 particulate matters; and then the CaSO3 and the CaSO4 particulate matters are removed by the second level dust collector so as to achieve the aim of removing the SO2 from the flue gas. The pulsed electric field dry type calcium-spraying flue gas desulfurization system in the conveying pipe is helpful to clean out superfine dust (PM10, the grain size is less than or equal to 10mu m). The high pressure pulsed electric field applied in the flue gas conveying pipe plays a role of predischarging the superfine dust and is advantageous for the purification through the second level electrostatic dust collector, thus the dust purifying efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a pulse electric field activated dry-type calcium-spraying flue gas desulfurization method and device in a conveying pipeline. Background technique [0002] The flue gas of industrial boilers such as coal-fired power plants contains a large amount of SO 2 , not only pollute the atmospheric environment, but also form acid rain, which seriously damages the ecological environment. Therefore, to remove SO from flue gas 2 , to solve the pollution of the atmospheric environment and the acid rain problem, has attracted worldwide attention and attention, and has become one of the global environmental problems that need to be solved urgently. [0003] A lot of research work has been done on flue gas desulfurization technology (FGD) at home and abroad. According to the type of desulfurizer and the dry and wet state of the final product, according to the characteristics ...

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low desulfurization rate, high Ca / S ratio, insufficient utilization rate of desulfurizer and high operating cost in charged dry absorbent injection desulfurization technology (CDSI), and provide Pulse electric field activated dry calcium injection flue gas desulfurization method

Therefore, the desulfurization rate is effectively improved (over 80%), and the Ca / S ratio is reduced (about 1.2 to 1.3), thereby solving the problems of insufficient utilization of desulfurization agent and high operating costs

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