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Hydrogen peroxide denitration process and denitration system

A technology of hydrogen peroxide and denitrification, which is applied in the direction of nitric acid, nitrous acid, nitrogen oxides/oxygen acid, etc., can solve the problems of harshness, low exhaust gas temperature, temperature requirements, etc., achieve complete denitrification, simple principle, and improve denitrification effect Effect

Inactive Publication Date: 2016-02-03
湖北蔚天环保科技有限公司
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Problems solved by technology

However, in many domestic industries, the exhaust gas temperature is low, and the traditional denitrification process has relatively strict temperature requirements

Method used

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  • Hydrogen peroxide denitration process and denitration system

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Embodiment Construction

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] A hydrogen peroxide denitrification process, using 50% hydrogen peroxide as an oxidant, catalyzing hydrogen peroxide to generate OH through high temperature and high pressure. High temperature and high pressure is to directly heat hydrogen peroxide to 400-500 °C, and the extra pressure generated by hydrogen peroxide is 1.6-2.0KPa, OH Mixing with flue gas affects the nitrogen oxides in flue gas (mainly NO and NO 2 etc.) for oxidation recovery, and finally the mixture is separated by gas and liquid to recover the denitrification by-products nitric acid and nitrous acid liquid, and the flue gas after denitrification can be directly discharged;

[0023] The specific chemical reaction formula is

[0024] h 2 o 2 →2·OH

[0025] h 2 o 2 +·OH→HO 2 ·+H 2 o

[0026] NO+HO 2 ·→NO 2 +·OH

[0027] NO 2 +·OH→HNO 3

[0028] NO+·OH→HNO ...

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Abstract

The invention relates to a hydrogen peroxide denitration process and a corresponding denitration system. According to the denitration process, hydrogen peroxide is taken as an oxidant; .OH is generated through high-temperature and high-pressure catalysis of hydrogen peroxide; .OH is mixed with flue gas, so that nitrogen oxides in the flue gas can be oxidized and recovered; finally, the obtained mixture is subjected to gas-liquid separation, denitration by-products, namely nitric acid and a nitrous acid liquid, are recovered, and the flue gas subjected to denitration is discharged to the outside. The denitration process and the denitration system have the advantages that hydrogen peroxide is taken as the denitration oxidant; through the mixing of hydrogen peroxide and high-temperature steam, hydrogen peroxide tends to be decomposed into hydroxy radical.OH and HO2., so that the nitrogen oxides oxidation and recovery effects are improved, the denitration rate is increased, and the temperature limitation is avoided.

Description

technical field [0001] The invention belongs to the technical field of industrial denitrification, and in particular relates to a process and a system device for utilizing hydrogen peroxide to oxidize NOx in low-temperature flue gas and recover by-product nitric acid. Background technique [0002] In July 2011, the Ministry of Environmental Protection officially approved the implementation of the "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13224-2011). Since the "Emission Standards of Air Pollutants for Thermal Power Plants" (hereinafter referred to as the "New Emission Standards") involves the control requirements for the concentration of pollutants in all operating stages of each thermal power generating unit, the "New Emission Standards" have greatly improved the standards for thermal power plants. The emission standards of air pollutants, the emission limits of sulfur dioxide and nitrogen oxides from new and existing thermal power plants, are sever...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56C01B21/40C01B21/50
Inventor 姚俊新
Owner 湖北蔚天环保科技有限公司
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