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A method of electrolytic denitrification

A denitration and formula technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of large investment and high operating costs in the SCR denitration process, and achieve low operating costs, reduced equipment investment, and low power consumption. Effect

Active Publication Date: 2015-12-02
淮南市明月环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the disadvantages of large investment and high operating costs of the SCR denitrification process, this application proposes an electrolytic denitrification method to achieve the purpose of denitrification, and achieve the effect of less system investment, stable and reliable operation, and no consumption of ammonia

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  • A method of electrolytic denitrification
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  • A method of electrolytic denitrification

Examples

Experimental program
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Effect test

Embodiment 1

[0028] figure 1 Medium denitrification absorption tower 1, slurry tank 2, filter 3, filtrate tank 4, washing liquid tank 5, slurry pump 6, slurry pump 7, filtrate pump 8, washing liquid pump 9, tower electrolysis device 10; sulfurous acid Calcium A, flue gas B, denitrification flue gas C, washing process water D, solid phase slag E.

[0029] The flue gas B at a temperature of 110°C enters the middle part of the denitrification absorption tower 1, and contacts with the circulating slurry, feed slurry, filtrate and washing process water sprayed from the upper part in countercurrent. The circulation of the slurry in the tower is not shown in the figure. The tower The inner slurry is output by the slurry pump 6, one part is sent to the slurry tank 2 to make slurry with the input calcium sulfite A, and then sent to the denitration absorption tower 1 by the slurry pump 7, and the other part is sent to the filter 3, and the filtrate is collected in the filtrate tank 4 , sent back to...

Embodiment 2

[0033] figure 2 Medium denitration absorption tower 1, slurry tank 2, filter 3, filtrate tank 4, washing liquid tank 5, slurry pump 6, slurry pump 7, filtrate pump 8, washing liquid pump 9, external electrolysis device 10; lime powder A, flue gas B, denitrification flue gas C, washing process water D, solid phase slag E.

[0034] The flue gas B enters the middle part of the denitrification absorption tower 1, and contacts with the circulating slurry, feed slurry, filtrate and washing process water sprayed from the upper part in countercurrent. The circulation of the slurry in the tower is not shown in the figure, and the slurry in the tower flows through the tower. The external electrolysis device 10, one part flows into the feeding slurry tank 2 to make slurry with the input lime powder A, and then is sent to the denitration absorption tower 1 by the slurry pump 7, and the other part is output by the slurry pump 6, and sent to the filter 3, and the filtrate is collected in ...

Embodiment 3

[0038] image 3 Medium denitrification absorption tower 1, filter 2, melting tank 3, washing liquid tank 4, slurry pump 5, circulating slurry pump 6, feed liquid pump 7, washing liquid pump 8, tower electrolysis device 9; flue gas A, denitrification Flue gas B, washing process water C, sodium sulfite D, solid phase slag E.

[0039] The flue gas A at a temperature of 110°C enters the middle part of the denitrification absorption tower 1, and contacts with the circulating slurry, feed liquid and washing process water sprayed from the upper part in countercurrent, most of the slurry in the tower is circulated by the circulating slurry pump 6, and a small part is circulated by the circulating slurry pump 6 The output of the slurry pump 5 is sent to the filter 2 for filtration. The filtrate and the input sodium sulfite D are dissolved in the dissolving tank 3 and then sent to the denitrification absorption tower 1 by the feed liquid pump 7. The filtered solid phase is washed with w...

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Abstract

The invention discloses an electrolytic denitrification method. The method comprises the following steps: absorbing NOx in smoke by using a formula absorbent in a denitration absorption tower, and then adding a desulphurization by-product or producing sulfite in the denitration absorption tower as a reducing agent to electrolyze absorption liquid, so that N2 is generated from NOx to be removed while sulfite generates sulfate. The electrolytic denitrification method has the beneficial effects that (1) the denitrification effect is achieved in wet absorption and electrolysis manners, and the denitrification rate is greater than or equal to 90%; (2) wet denitrification is widely applicable to dust conditions in the smoke, and meets the dust removal and denitrification requirements of a small power plant without a dust removal bag, and the collection coefficient is greater than or equal to 95%; (3) dust in the smoke is washed and removed in the denitration absorption tower by wet denitrification, so that the subsequent desulphurization by-product is high in purity and quality, and the by-product value is improved; (4) the electrolytic denitrification method is small in equipment investment and low in operation cost.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to a method for removing NOx in flue gas by electrolysis, more specifically, absorbing NOx in flue gas with a formulated absorbent in an absorption tower, and then electrolyzing the absorbing liquid in the presence of a reducing agent to make NOx Generate N 2 method of removal. Background technique [0002] The control of NOx mainly adopts low-nitrogen oxide combustion technology and NH 3 Selective Catalytic Reduction (SCR). SCR is the most efficient of all NOx removals and, combined with combustion modification, reduces NOx emissions by 90%. The SCR equipped in Europe and Japan can remove 60% to 80% of NO, and the ammonia leakage rate is lower than 5ppm. But NH 3 In the catalytic degradation, small particles are easy to block the catalyst, shortening the catalytic cycle, and the oxygen in the flue gas is used for NH 3 It is unfavorable to reduce NOx by other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/73B01D53/56
Inventor 陶陶陶俊万敏
Owner 淮南市明月环保科技有限责任公司