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Efficient denitrifying device of circular fluidized bed boiler

A circulating fluidized bed and boiler technology, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of blocking the air gap of catalytic substances, shortening the life of catalytic substances, and reducing denitrification efficiency, so as to promote reduction, Simple structure, effect of reducing nitrogen oxide content

Inactive Publication Date: 2012-02-22
中能东讯新能源科技(大连)有限公司 +1
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Problems solved by technology

[0005] 2. High investment and high operating costs
Poor SCR design will result in reduced denitrification efficiency, shortened catalyst lifetime and the potential for large amounts of ammonium sulfate - a sticky substance that can clog catalyst air gaps and block flue gas flow

Method used

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  • Efficient denitrifying device of circular fluidized bed boiler
  • Efficient denitrifying device of circular fluidized bed boiler
  • Efficient denitrifying device of circular fluidized bed boiler

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Embodiment Construction

[0018] figure 1 , 2 A working principle diagram of a high-efficiency denitrification device for a circulating fluidized bed boiler is shown. In the figure, the denitrification device adopts a cyclone separator 2, which is connected tangentially to the boiler exhaust duct 3 of the circulating fluidized bed boiler 1, and a smoke return pipe connected to the circulating fluidized bed boiler 1 is provided at the lower part. Road 10, the upper part is provided with a flue outlet 9, and the bottom part of the flue outlet 9 is provided with an inner flue 9a extending into the cyclone separator 2. Four first denitration agent nozzles 4 for injecting denitration agent into the boiler flue exhaust duct 3 are arranged on the boiler flue exhaust duct 3 . Between the outer casing 2 of the cyclone separator and the inner flue 9a, four second denitrification agent nozzles 5 for spraying denitrification agent into the cyclone separator 2 are arranged at the top of the formed annular cavity....

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Abstract

The invention provides an efficient denitrifying device of a circular fluidized bed boiler, and belongs to the technical field of efficient denitrification of coal-fired boilers. In the invention, an original cyclone separator of a boiler is utilized, and a denitrifying device is arranged on the cyclone separator; smoke of the boiler enters the cyclone separator in a tangential direction through a flue after being discharged out of a hearth; and nozzles are respectively arranged on the flue and the top of the cyclone separator, and are used for spraying denitrifying agent. When the efficient denitrifying device is adopted, a strong whirl is formed after the denitrifying agent and the smoke enter the cyclone separator from the flue in the tangential direction, so that the speed of mixing the denitrifying agent and nitric oxide in the smoke, the reduction of the nitric oxide in the smoke is accelerated, and the content of the nitric oxide in the smoke is obviously reduced; further reconstruction on the flue of the boiler is not needed; and the efficient denitrifying device has the advantages of simple structure, low cost and high denitrifying efficiency.

Description

technical field [0001] The invention relates to a high-efficiency denitrification device for a circulating fluidized bed boiler, belonging to the technical field of high-efficiency denitrification of coal-fired boilers. Background technique [0002] In the general non-catalyzed denitrification scheme, nitrogen oxides (NO X ) emissions, this method can reduce nitrogen oxides (NO X ) reduced to N 2 , but its denitrification efficiency is difficult to exceed 50%, especially for large boilers. The main reason is that the denitrification efficiency is affected by the following factors: 1) the nitrogen oxides and denitrification agent are not fully mixed in the combustion chamber; 2) the flue gas temperature distribution in the denitrification reaction area is uneven; The ratio of denitrification agent concentration does not match. Therefore, many traditional SNCR methods can no longer meet the strict requirements for NOx emissions from coal-fired boilers. [0003] In the 197...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/56
Inventor 唐遵义
Owner 中能东讯新能源科技(大连)有限公司
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