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Chloric strong oxidant enhanced wet combined urea desulfurizing and denitrifying process

A technology of desulfurization, denitrification and strong oxidant is applied in the field of wet combined desulfurization and denitrification technology, which can solve the problems of difficulty in achieving higher nitrogen oxide removal efficiency, and achieve the effects of simple structure, improved oxidation degree and convenient operation.

Inactive Publication Date: 2007-06-27
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Application Information

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Problems solved by technology

[0008] The invention provides a wet-process combined desulfurization and denitrification process of urea enhanced by a chlorine-containing strong oxidant, which solves the problem that the urea wet-process combined desulfurization and denitrification technology is difficult to achieve a high and stable removal efficiency of nitrogen oxides

Method used

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  • Chloric strong oxidant enhanced wet combined urea desulfurizing and denitrifying process

Examples

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Effect test

Embodiment 1

[0021] Prepare an absorption solution containing 5% urea, add 0.2% sodium chlorite to the absorption solution as a highly active mixed absorption solution for combined desulfurization and denitrification, and fully contact the flue gas entering it in the bubble reactor, and the flue gas NOx, SO in 2 A chemical reaction occurs leading to harmless products. The test results of the exhausted flue gas show that the nitrogen oxide removal efficiency of 75% to 96% and the desulfurization efficiency of more than 95% can be achieved.

Embodiment 2

[0023] Prepare an absorption solution containing 15% urea, add 0.01% sodium chlorite to the absorption solution as a highly active mixed absorption solution for combined desulfurization and denitrification, and fully contact the flue gas entering it in the bubble reactor, and the flue gas NOx, SO in 2 A chemical reaction occurs leading to harmless products. The test results of the exhausted flue gas show that the nitrogen oxide removal efficiency of 79% to 97% and the desulfurization efficiency of more than 95% can be achieved.

Embodiment 3

[0025] Prepare an absorption liquid containing 25% urea, add 1% sodium chlorite to the absorption liquid, as a highly active mixed absorption liquid for combined desulfurization and denitrification, fully contact with the flue gas entering it in the bubble reactor, and the flue gas NOx, SO in 2 A chemical reaction occurs leading to harmless products. The test results of the exhausted flue gas show that the nitrogen oxide removal efficiency of 90% to 95% and the desulfurization efficiency of more than 95% can be achieved.

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Abstract

The wet combined fume desulfurizing and denitrifying process with chloric strong oxidant enhanced urea has the fume to be treated contacted sufficiently with the mixed absorbent liquid containing urea and chloric strong oxidant inside the absorbing reactor so as to eliminate NOx and SO2 through absorption before being exhausted. The chloric strong oxidant is sodium chlorite, sodium hypochlorite, bleaching powder or their mixture. The process has high denitrifying efficiency, high fume purifying effect, simple structure, easy operation and small occupied land. The said process can reach NOx eliminating rate of 75-98 % and desulfurizing efficiency over 95 %.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a wet combined desulfurization and denitrification process in which strong chlorine-containing oxidants are used to enhance urea in flue gas purification. Background technique [0002] At present, the problem of air pollution in my country is serious. The country has formulated increasingly stringent air pollutant discharge standards and strengthened the management of sewage charges. In order to protect human health and the ecological environment, desulfurization and denitrification of coal-fired flue gas has become an urgent task. Among them, the wet flue gas purification technology has attracted much attention because of its simplicity and good effect. [0003] After years of research and practice, the wet flue gas desulfurization technology is relatively mature. The commonly used limestone-gypsum method, double alkali method, sodium nitrate circulation method, am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/78B01D53/14
CPCY02A50/20
Inventor 吴忠标黄艺赵伟荣莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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