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Low-temperature flue gas desulfurization and denitrification coupling absorption process capable of reducing oxidant escape

A technology for desulfurization and denitrification, low-temperature flue gas, applied in gas treatment, chemical instruments and methods, membrane technology, etc., can solve the problems of oxidant surplus and escape, achieve effective coupling, shorten the process, and solve the effect of secondary pollution problems

Pending Publication Date: 2020-04-10
双盾环境科技有限公司
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  • Claims
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Problems solved by technology

For low-temperature flue gas denitrification by oxidation method, there is a possibility of oxidant escape due to excess oxidant, especially when the flue gas fluctuates, the oxidant escape phenomenon is more serious, and it is currently one of the concerns in the industry

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  • Low-temperature flue gas desulfurization and denitrification coupling absorption process capable of reducing oxidant escape

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] like figure 1 Shown: a low-temperature flue gas desulfurization and denitrification coupling absorption process to reduce oxidant escape, the process is as follows: use oxidants to oxidize the nitrogen oxides containing low-valence nitrogen in the flue gas to nitrogen oxides with high-valence nitrogen; and then Send the flue gas containing nitrogen oxides of high valence nitrogen into the desulfurization and denitrification coupling absorption tower 3, and use alkaline solution absorbent in the desulfurization and denitration coupling absorption tower 3 to absorb the nitrogen oxides of high valence nitrogen in the flue gas into nitric acid Salt, the SO in the flue gas 2 Absorbed as sulfite and bisulfite, so as to achieve the purpose of desulfurization and denitrification at the same time; at the same time, the residual oxidant in the flue gas is...

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Abstract

The invention discloses a low-temperature flue gas desulfurization and denitrification coupling absorption process capable of reducing oxidant escape. The process comprises the following steps: oxidizing a nitrogen oxide containing low-valence nitrogen in flue gas into a nitrogen oxide containing high-valence nitrogen by adopting the oxidant; then conveying the flue gas containing the nitrogen oxide containing high-valence nitrogen into a desulfurization and denitrification coupling absorption tower (3), absorbing the nitrogen oxide containing high-valence nitrogen in the flue gas into a nitrate in the desulfurization and denitrification coupling absorption tower (3) through an alkaline solution absorbent, and absorbing SO2 in the flue gas into a sulfite and a bisulfite; and meanwhile, reducing the residual oxidant in the flue gas by using the sulfite and a hydrosulfite formed by absorption in the desulfurization and denitrification coupling absorption tower (3). The process disclosedby the invention comprises three technological processes of desulfurization, denitration and oxidant removal, so that the purposes of desulfurization and denitration can be achieved, meanwhile, the discharge amount of the oxidant is remarkably reduced, the flue gas treatment process is shortened, and the problem of oxidant escape of an oxidation method low-temperature denitration process is solved.

Description

technical field [0001] The invention relates to the technical field of low-temperature desulfurization and denitrification of industrial tail gas, in particular to the technical field capable of reducing oxidant escape, and specifically relates to a low-temperature flue gas desulfurization and denitrification coupled absorption process for reducing oxidant escape. Background technique [0002] At present, the process requirements for desulfurization and denitrification of industrial tail gas in various industries are common. The desulfurization and denitration of flue gas are two different processes, so different equipment is generally used for removal. For low-temperature flue gas desulfurization, the wet desulfurization process is generally used in the desulfurization tower. Flue gas denitrification is more commonly used by SNCR and SCR processes, but for low temperature (below 100°C) flue gas, oxidation denitrification process is generally used. For low-temperature flue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/50B01D53/56
CPCB01D53/75B01D53/78B01D53/76B01D53/56B01D53/502B01D2258/0283B01D2251/104B01D2251/304B01D2251/404
Inventor 宋小良曹伟
Owner 双盾环境科技有限公司
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