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Design method of SNCR-SCR combined flue gas denitrification system process

A design method and flue gas technology, applied in the chemical industry, can solve problems affecting denitrification work, catalyst poisoning, high installation costs, etc., and achieve the effects of reducing the probability of poisoning, reducing the size, and reducing input costs

Active Publication Date: 2016-04-06
HUAWEI TEHCHNOLOGIES CO LTD
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Problems solved by technology

The SCR process can control the ammonia escape rate below 3ppm while the denitrification efficiency reaches 90%. The disadvantages are high installation cost, complicated structure, and various factors may cause catalyst poisoning and affect the denitrification work. It is widely used in Large boiler denitrification treatment

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  • Design method of SNCR-SCR combined flue gas denitrification system process

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Embodiment Construction

[0023] Below in conjunction with specific embodiment, further illustrate the present invention, should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various equivalent forms of the present invention All modifications fall within the scope defined by the appended claims of the present application.

[0024] The design method of a SNCR-SCR combined flue gas denitrification system process disclosed in the embodiment of the present invention mainly includes the process parameter design of the two parts of SNCR and SCR reaction, and respectively establishes a mathematical model for solving the volume flow rate of the reducing agent in the SNCR part. The theoretical value of the reducing agent volume flow rate is obtained by calculation; in the SCR part, the theoretical value of the catalyst volume ...

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Abstract

The invention discloses a design method of an SNCR-SCR combined flue gas denitrification system process. The method comprises the steps: firstly, establishing an SNCR-SCR combined denitrification process mathematical model for calculation of the reducing agent volume flow rate and calculation of the catalyst volume; then measuring concentration information of NOx in flue gas, flue gas flow quantity and flue gas temperature information by a measuring instrument; and finally, combining the measured information and the mathematical model, and calculating the reducing agent volume flow rate and the catalyst volume. Through the SNCR-SCR denitrification process mathematical model, the ammonia-containing reducing agent volume flow rate and the designed catalyst volume are resolved, the denitrification efficiency of a medium and small sized boiler can be improved, the size of an SCR catalyst is reduced, the probability of catalyst poisoning is reduced, and the input cost is reduced.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a design method of an SNCR-SCR combined flue gas denitrification system process. Background technique [0002] The flue gas emitted from coal-fired power plants, hazardous waste incineration treatment, and mineral smelting processes contains a large amount of nitrogen oxides (NOx). Under certain conditions, nitrogen oxides can chemically react with ammonia to generate nitrogen that is not polluting to the environment. and water. Both SNCR and SCR technologies use ammonia or urea as a reducing agent, spray its aqueous solution into the flue gas through a nozzle, and undergo a selective reduction reaction with nitrogen oxides in the flue gas, and the products are nitrogen and water that do not pollute the environment. The reaction temperature of the two technologies is different. According to the research of scholars such as Muzio and Miller, SNCR does not use a catalyst, and the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/75B01D53/56
CPCB01D53/56B01D53/75
Inventor 杜军郑喜洋倪春亚
Owner HUAWEI TEHCHNOLOGIES CO LTD
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