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Method for removing nitric oxide from waste gas

A nitric oxide and waste gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high operating costs, no industrialization, and inability to regenerate and recycle the absorption liquid, and achieve investment and operation. Low cost, no secondary pollution, easy operation

Inactive Publication Date: 2004-11-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The results show that when the ferrous chelating agent is added to the wet desulfurization washing liquid for simultaneous desulfurization and denitrification, the operation cost is very high because the absorption liquid cannot be regenerated and recycled, so this method has not been industrialized

Method used

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specific Embodiment approach

[0010] Specific embodiments: the present invention contacts a certain concentration of ferrous chelating agent denitrification washing liquid with nitrogen monoxide-containing waste gas in an absorption device that is added with iron powder or iron filings.

[0011] First, the nitric oxide in the exhaust gas is complexed by the ferrous chelating agent into the liquid phase:

[0012] ①

[0013] Then, the NO combined with the chelated iron is reduced to N2 by the chelated iron according to the formula ②, and the chelated iron is regenerated:

[0014] ②

[0015] In the process of denitrification by the above reaction, the O in the exhaust gas 2 And the NO combined with chelated iron will part of the Fe through formula ③ and formula ④ 2+ Oxidized to Fe 3+ , while Fe 3+ The chelating agent can not undergo complex reaction with NO, and the Fe in the absorption solution can be maintained through the reaction ⑤ 2+ The concentration allows t...

Embodiment

[0024] Embodiment: first prepare the denitrification washing solution of 5-45mM with aminocarboxyl chelating agent and ferrous acid in equimolar ratio, and adjust its pH value to 1.0-10 with lye; then, let the absorption solution and the waste gas containing NO Contact in the denitrification equipment (if the metal iron used is iron filings, the absorption equipment is a packed tower; if the metal iron used is iron powder, the absorption equipment can be a stirred reactor), the denitrification process is at a normal pressure of 5-90°C Or carry out under pressure; the regeneration of the absorption liquid uses the method of precipitation, centrifugation or filtration to remove the precipitate, and the method of adding acid to adjust its pH value. Fe(OH) obtained during regeneration n (H 2 O) m The precipitate can be used to prepare iron powder dyes or other chemical products of iron. The method has simple process and high denitrification efficiency, which can reach more than...

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Abstract

The invention refers to a method for eliminating nitrogen oxide from waste gas, which solves the problem of high investment and high cost by using current selective catalyst reducing method and selective non-catalyst reducing method. It uses the ferrous iron mist liquid as the denitriding liquid. The reducing matter is iron. The method uses ferrous chelator to react with the nitrogen oxide, generates nitrosyl complex, the nitrogen oxide in the waste gas enters the liquid phase, the iron and the nitrosyl complex react, reduces the nitrogen combined with the chelate iron into N2. The process is simple, the operation is convenient. The cost is low, and the efficiency is high.

Description

Technical field: [0001] The invention relates to a method for removing nitrogen monoxide in waste gas. Background technique: [0002] At present, the removal technologies of nitric oxide in industrial waste gas mainly include: selective catalytic reduction method and selective non-catalytic reduction method. The investment and operating costs of these two methods are relatively high, and each has some disadvantages. Therefore, the research and development of simple, cheap and applicable new technologies for nitric oxide control has been a hot topic in the field of air pollution control for more than 20 years. [0003] Since the 1970s, the United States and Japan have carried out a lot of research and determination on the simultaneous removal of SO2 and NOX in flue gas by liquid phase complexation. The results show that when adding ferrous chelating agent to the wet desulfurization washing liquid for simultaneous desulfurization and denitrification, the operation cost is ve...

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/79
Inventor 童志权马乐凡
Owner XIANGTAN UNIV
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