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Purification process for acid oxidation and alkaline reduction of waste gas containing nitrogen oxide

A technology for nitrogen oxides and exhaust gas, applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc., can solve the problems of low removal rate of nitrogen oxides and low oxidation degree

Inactive Publication Date: 2011-09-21
BEIJING UNIV OF CHEM TECH +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the oxidation degree (NO 2 / NO molar ratio) is low, that is, the proportion of nitrogen monoxide is too high, which ultimately makes the removal rate of nitrogen oxides in the exhaust gas low.

Method used

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  • Purification process for acid oxidation and alkaline reduction of waste gas containing nitrogen oxide
  • Purification process for acid oxidation and alkaline reduction of waste gas containing nitrogen oxide

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Embodiment Construction

[0030] 1) Exhaust gas conditions

[0031] 40,000 cubic meters per hour, temperature ~ 100°C, normal pressure

[0032] Nitrogen oxides: 1300ppM, Dust: 30~50mg / m3

[0033] 2) Oxidant solution: mass percent concentration > 30% dilute nitric acid

[0034] 3) Alkaline reducing agent solution: sodium hydroxide / sodium sulfide with a mass percentage concentration of 5-10%, wherein the mass ratio of alkali: reducing agent=1-1.5; the cost is 150-300 yuan / ton of reducing solution

[0035] 4) Process flow

[0036] Under the suction of the tail gas fan, the exhaust gas containing nitrogen oxides enters the oxidation tower from the bottom of the oxidation tower. The exhaust gas first passes through the two-stage flow-through trays, and contacts with the acidic oxidant solution for heat exchange, washing and dust removal. At the same time, the exhaust gas intake is evenly distributed, and the nitric oxide in the exhaust gas is oxidized through the liquid layer of the acidic oxidant solution...

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Abstract

The invention discloses a purification process for acid oxidation and alkaline reduction of waste gas containing nitrogen oxide and belongs to the field of treatment processes of the waste gas containing the nitrogen oxide by using an acid oxidation and alkaline reduction purification process. The process comprises the following steps of: washing the waste gas containing the nitrogen oxide in an acid oxidizing agent solution by using composite tower equipment, and carrying out absorption and oxidizing reaction to improve the degree of oxidization (the molar ratio of nitrogen dioxide (NO2) to nitric oxide (NO)) of the nitrogen oxide in the waste gas; and re-washing in an alkaline reducing agent solution, and carrying out absorption and reduction reaction to make the nitrogen oxide in the waste gas reduced into nitrogen and water, so that the nitrogen oxide in the waste gas is thoroughly removed, the aim of purifying the waste gas containing the nitrogen oxide is fulfilled, and the process contributes to environmental protection.

Description

technical field [0001] The invention belongs to the process of treating exhaust gas containing nitrogen oxides by adopting an acid oxidation-alkaline reduction purification process. That is, through the composite tower equipment, the exhaust gas containing nitrogen oxides is first washed, absorbed and oxidized by an acidic oxidant solution to increase the oxidation degree of nitrogen oxides in the exhaust gas (NO 2 / NO molar ratio). Then, it is washed again, absorbed and reduced by an alkaline reducing agent solution, so that the nitrogen oxides in the exhaust gas can be reduced and converted into nitrogen and water, and the nitrogen oxides in the exhaust gas can be completely removed to achieve the purpose of purifying the nitrogen oxide exhaust gas. Conducive to environmental protection. Background technique [0002] There are three process methods for the purification of nitrogen oxide exhaust gas: catalytic reduction method, adsorption method and absorption method. Am...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56
Inventor 雍兴跃雍兴海屈一新赵明张振洲任洪东沈汉杰
Owner BEIJING UNIV OF CHEM TECH
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