Method and device for purifying nitric oxide and fog particles in wet desulphurization aerial fog by low-temperature plasma

A low-temperature plasma and wet desulfurization technology, which is applied to chemical instruments and methods, separation methods, combined devices, etc., can solve the problems of low denitrification efficiency, inability to efficiently oxidize NO, and weak high-energy electronic chemical effects, so as to reduce investment and running cost effects

Active Publication Date: 2014-08-20
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional wet electrostatic demisting technology is based on negative high-voltage discharge to generate high-energy electrons. The main purpose is to separate fog par

Method used

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  • Method and device for purifying nitric oxide and fog particles in wet desulphurization aerial fog by low-temperature plasma
  • Method and device for purifying nitric oxide and fog particles in wet desulphurization aerial fog by low-temperature plasma

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Experimental program
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Effect test

Embodiment 1

[0027] Apply the device provided by the present invention to purify nitrogen oxides and mist particles in the wet desulfurization gas mist by using low-temperature plasma, the discharge electrode 4 adopts a zigzag shape, the ground electrode 5 is in the shape of a W-shaped plate, and the high-voltage power supply 3 is a positive DC high voltage Power supply, the discharge voltage is 50kV; use the purification device based on this configuration to process the wet desulfurization gas mist of a chemical company boiler, and the gas volume is 160000Nm 3 / h. The test results show that the removal efficiency of mist particles is higher than 97.3%, and the removal efficiency of nitric oxide is higher than 60.6%.

Embodiment 2

[0029] The discharge electrode 4 adopts a zigzag shape, the ground electrode 5 is a Z-shaped plate, the high-voltage power supply 3 is a positive DC high-voltage power supply, and the discharge voltage is 20kV; the purification device based on this configuration is used to treat the boiler wet desulfurization gas mist of an electric company , the processing gas volume is 122000Nm 3 / h. The test results show that the removal efficiency of mist particles is higher than 96.5%, and the removal efficiency of nitric oxide is higher than 72%.

Embodiment 3

[0031] The discharge electrode 4 adopts the shape of serially connected gears (four teeth are uniformly distributed on each gear), the ground electrode 5 is a cylindrical honeycomb body, and the high-voltage power supply 3 is a positive DC high-voltage power supply superimposed with a high-frequency AC power supply, wherein the positive polarity The DC working voltage is 70kV; the purification device based on this configuration is used to treat the boiler wet desulfurization gas mist of a petrochemical company, and the gas volume is 800000Nm 3 / h. The test results show that the removal efficiency of mist particles is higher than 96%, and the removal efficiency of nitric oxide is higher than 66%.

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Abstract

The invention discloses a method and device for purifying nitric oxide and fog particles in wet desulphurization aerial fog by low-temperature plasma. The method comprises the steps of introducing the wet flue gas desulphurization aerial fog into a purification device, and oxidizing nitric oxide in the aerial fog into nitrogen dioxide with strong hydrophilia by the low-temperature plasma generated by high voltage discharge; furthermore, catching the fog particles in the aerial fog, which are charged and directionally move onto an electrode liquid film under high voltage discharge; and prompting the airflow to move towards an electrode by the inductive effect of moving particles in the electric field, and contacting nitrogen dioxide with the electrode liquid film so that nitrogen dioxide is absorbed and removed. Due to the oxidation of the low-temperature plasma and the directional movement of the airflow and the charged particles under the action of electric field force, gaseous mercury, sulfur trioxide sol, smoke and the like in the aerial fog can be removed. The method and the device realize the purpose that multiple pollutants in the wet desulphurization aerial fog are removed at the same time, namely, the multiple pollutants can be removed in a reactor, so that the investment and the operating cost of flue gas treatment can be greatly reduced.

Description

technical field [0001] The invention relates to a method and a device for purifying nitrogen oxides and mist particles in wet desulfurization gas mist, belonging to the technical field of environmental protection. More specifically, it relates to a method and device for purifying nitrogen oxides and mist particles in wet desulfurization gas mist by utilizing the oxidation of low-temperature plasma, the directional movement of airflow induced by moving particles, and the absorption of mist particles and electrode liquid film. Background technique [0002] As we all know, coal accounts for about 70% of my country's primary energy consumption, and coal-fired flue gas SO 2 and NO x (x=1,2) is the main cause of serious air pollution. In order to control coal-burning pollution, our country first focused on thermal power boilers, and then extended to industrial boilers and kilns, and carried out flue gas desulfurization and denitrification work. The mainstream technology is sele...

Claims

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Application Information

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IPC IPC(8): B01D53/32B01D50/00
CPCY02A50/20
Inventor 朱天乐齐震孙也丁雳
Owner BEIHANG UNIV
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