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Novel cathode and anode electro-catalysis synergistic flue gas denitration method

An electrocatalysis, cathode and anode technology, which is applied in the field of novel cathode and anode electrocatalysis synergistic flue gas denitrification, can solve the problems of large consumption of reagents, increased subsequent treatment of waste liquid, and decreased denitrification efficiency of absorbing liquid regeneration, and achieves the effect of high denitrification efficiency.

Active Publication Date: 2020-08-11
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet flue gas denitrification technology has the advantages of simple equipment and process, easy operation, and labor cost saving. However, the problem of regeneration of the absorption liquid and the decline in denitrification efficiency after regeneration are also a difficult problem for this technology.
Strong NOx oxidants represented by ozone, potassium permanganate, hydrogen peroxide, and hypochlorous acid are limited in the application of this technology due to the large consumption of reagents and the increase in the subsequent treatment of waste liquid

Method used

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  • Novel cathode and anode electro-catalysis synergistic flue gas denitration method

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Experimental program
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Effect test

Embodiment 1

[0026] Using Ti / IrO 2 -RuO 2 is the anode, copper is the cathode, and the distance between the electrodes is 5 cm. Using 0.05M NaCl as the electrolyte, the initial pH value was adjusted to 7. The concentration of NO is 500ppm, and it enters the solution through a membrane microporous aerator at a flow rate of 1L / min. The electrolyte is sprayed from the top spray device through the lift pump, and part of the gas that overflows the solution is brought back to the solution. After the treated gas overflows from the top of the reactor, it is introduced into a gas cylinder, and its concentration is measured by a flue gas analyzer to monitor the degree of NOx treatment in real time.

[0027] Working current density is 20mA / cm 2 , the NO conversion rate was 90%.

Embodiment 2

[0029] The lead oxide electrode is used as the anode, and the metal Pd coating is used as the cathode, and the distance between the electrodes is 5 cm. Using 0.07M NaCl as the electrolyte, the initial pH value was adjusted to 7. The concentration of NO is 500ppm, and it enters the solution through the membrane microporous aerator at a flow rate of 1.2L / min. The electrolyte is sprayed from the top spray device through the lift pump, and part of the gas that overflows the solution is brought back to the solution. After the treated gas overflows from the top of the reactor, it is introduced into a gas cylinder, and its concentration is measured by a flue gas analyzer to monitor the degree of NOx treatment in real time.

[0030] Working current density is 25mA / cm 2 , the NO conversion rate was 92%.

Embodiment 3

[0032] Using Sb-SnO 2 The electrode is the anode, the metal cobalt is the cathode, and the distance between the electrodes is 6cm. Using 0.08M NaCl as the electrolyte, the initial pH value was adjusted to 7. The concentration of NO is 500ppm, and it enters the solution through the membrane microporous aerator at a flow rate of 1.3L / min. No spraying device is used, the treated gas overflows from the top of the reactor and is introduced into a gas cylinder, and the concentration is measured by a flue gas analyzer to monitor the degree of NOx treatment in real time.

[0033] The working current density is 30mA / cm 2 , the NO conversion rate was 80%.

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Abstract

The invention discloses a novel cathode and anode electro-catalysis synergistic flue gas denitration method, which belongs to the technical field of atmospheric treatment. According to the method disclosed by the invention, NO in the flue gas is oxidized into high-valence NOx which is easily dissolved in a water body by utilizing active matters generated by anodic oxidation; NOx absorbed by the water phase is converted into nitrite and nitrate, meanwhile, dissolved nitrate nitrogen can be converted into nitrogen or ammonium on the cathode through the catalytic reduction effect, and the generated ammonium can be finally oxidized into nitrogen by hypochlorous acid generated by anode electrolysis. According to the system, the solution is lifted to the top of the reaction device through the lifting pump and forms spray through the spraying device, so that the contact time and the contact area of NO and the solution are further increased, and the treatment efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of atmospheric treatment, and in particular relates to a novel cathode-anode electrocatalysis cooperative flue gas denitrification method. Background technique [0002] my country's energy structure is dominated by coal, and the flue gas produced during its combustion process contains a large amount of NOx, of which 90-95% is insoluble NO, which will cause a series of environmental problems such as the hole in the ozone layer, photochemical smog, acid rain, and smog. Therefore, in recent years, flue gas desulfurization and denitrification has become a strategic point in my country's energy and environmental fields, especially for the treatment of haze pollution, which has attracted much attention at present. It has important environmental and social significance. [0003] The NOx control technology started relatively late, and currently there are two main types: one is the use of low NOx combustion technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/32B01D53/56
CPCB01D53/326B01D53/56B01D2258/0283
Inventor 江波徐灿程关雨欣牛庆赫刘树梁孟宪哲刘奕捷
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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