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Wet-method flue gas denitration process regenerating potassium permanganate

A technology of potassium permanganate and flue gas, which is applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of spray tower blockage, reduce the cost of chemicals, etc., to increase the consumption of urea, improve the utilization rate, The effect of avoiding decomposition side reactions

Active Publication Date: 2020-06-16
厦门紫金矿冶技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention aims to provide a wet flue gas denitrification process for regenerating potassium permanganate, which regenerates the absorption liquid through electrolysis, significantly reduces the cost of chemicals, and matches a new type of reactor, optimizes operating parameters, and solves the problem of Solved the problem that the reduction product caused the blockage of the spray tower

Method used

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  • Wet-method flue gas denitration process regenerating potassium permanganate

Examples

Experimental program
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Effect test

Embodiment 1

[0018] A wet flue gas denitrification process of regenerated potassium permanganate, such as figure 1 shown, including the following steps:

[0019] S1. Pass the absorption liquid and the flue gas into the rotating packed bed, make the flue gas fully contact with the absorption liquid, and at least part of the NO in the flue gas is oxidized into easily absorbed NO 2 , and further reduction yields N 2 , to achieve efficient removal of nitrogen oxides; the absorption liquid includes potassium permanganate, sodium hydroxide and urea;

[0020] The reaction of step S1 is shown in the following formula:

[0021] KMnO 4 +NOx→K 2 MnO 4 +MnO 2 +NO 2 (1)

[0022] NO 2 +CH 4 N 2 O→H 2 O+N 2 +CO 2 (2)

[0023] S2. Flow the absorbed liquid obtained after step S1 into the electrolytic regeneration tank for electrolytic regeneration of the absorption liquid; in the electrolytic regeneration tank, the current density is 10-60A / m 2 , the temperature of the electrolyte is 50-8...

Embodiment 2

[0029] Pass the absorption liquid and flue gas into the rotating packed bed, make the flue gas fully contact with the absorption liquid, and at least part of the NO in the flue gas is oxidized into easily absorbed NO 2 , further reduction produces N 2 , to achieve efficient removal of nitrogen oxides. The absorption liquid includes potassium permanganate, sodium hydroxide and urea. Rotating packed bed RPB speed is 1000r min -1 , the gas-liquid ratio is 150m 3 / L. The parameters of flue gas are: NOx concentration 200ppm, temperature 20°C. The concentration of potassium permanganate in the absorption liquid is 50g / L, the concentration of sodium hydroxide is 100g / L, and the mass concentration of urea is 15g / L. The denitrification efficiency reaches 84%.

[0030] Transfer the absorbed solution after the denitrification reaction to the electrolytic regeneration tank, where the electrolyte temperature is 65°C and the anode current density is 45A / m 2 Potassium permanganate can...

Embodiment 3

[0032] Pass the absorption liquid and flue gas into the rotating packed bed, make the flue gas fully contact with the absorption liquid, and at least part of the NO in the flue gas is oxidized into easily absorbed NO 2 , further reduction produces N 2 , to achieve high-efficiency removal of nitrogen oxides; the absorption liquid includes potassium permanganate, sodium hydroxide and urea. In this example, the rotational speed of the rotating packed bed RPB is 500r·min -1 , the gas-liquid ratio is 50m 3 / L. The flue gas parameters are: NO concentration 2000ppm, temperature 50°C. The concentration of potassium permanganate in the absorption liquid is 80g / L, the concentration of sodium hydroxide is 20g / L, and the mass concentration of urea is 30g / L. The denitrification efficiency reaches 88%.

[0033] Transfer the absorption solution after the denitrification reaction to the electrolytic regeneration tank. The temperature of the electrolyte is 50°C and the anode current densi...

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Abstract

The invention discloses a wet-method flue gas denitration process regenerating potassium permanganate. A rotating packed bed is selected as a denitration reactor, the mass transfer coefficient of thereactor is increased, the denitration effect is greatly improved, the operation mode of low gas-liquid ratio is adopted, the problems of precipitation, scaling and blockage of MnO2 products in the reactor are avoided, and the utilization rate of potassium permanganate can be effectively increased. Besides, the denitration system in the process determines that an electrolysis system is potassium manganate, urea, and caustic soda flakes; the proportions of all components in the absorption liquid are designed, so that the concentration proportion of potassium manganate in the subsequent electrolytic regeneration step is increased, the concentration proportion of urea is reduced, and the problems of decomposition side reaction of urea at an anode, inhibition of generation of potassium permanganate and aggravation of urea consumption in an alkaline system are avoided. Compared with a traditional potassium permanganate regeneration process, the process has an advantage that the concentrationof potassium manganate in the electrolysis system of the process is relatively low, and therefore brand-new low-current-density electrolysis parameters are adopted in the process, and energy consumption can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas treatment, in particular to a wet flue gas denitrification process for regenerating potassium permanganate. Background technique [0002] Nitrogen oxides (NOx) mainly include NO and NO 2 , mainly from thermal power plant flue gas, automobile exhaust, and industrial exhaust from chemical and metallurgical factories. . In recent years, with the acceleration of my country's industrialization and urbanization, air pollution has become increasingly serious, and nitrogen oxide treatment has become a very serious problem. [0003] Currently, NO X The main pollution prevention technology is flue gas denitrification, and the denitrification methods mainly include dry method and wet method. Dry denitrification technologies mainly include catalytic reduction method, plasma oxidation method, adsorption method and so on. The Selective Catalytic Reduction (SCR) method in the dry process has mature technol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/56B01D53/78B01D53/96
CPCB01D53/56B01D53/78B01D53/965B01D2258/0283B01D2251/304B01D2251/604B01D2251/2067
Inventor 陈杭石瑀王俊娥衷水平吴星琳张恒星
Owner 厦门紫金矿冶技术有限公司
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