Over-fire-air device for different load pulverized-coal fired boilers

A technology of burnout air and pulverized coal, which is used in combustion equipment, lighting and heating equipment, etc., can solve the problems of weakened penetration, reduced burnout air momentum, and uneven mixing of burnout air.
CN101806450AInactive Publication Date: 2010-08-18HARBIN INST OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2010-08-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an over-fire-air device for different load pulverized-coal fired boilers, and to an over-fire-air device, which solves the problems of the pulverized-coal fired boiler by utilizing the present over-fire-air device that when the load is different and particularly when the device runs at a low load, the over-fire-air momentum is reduced, the penetrating power is weakened, the mixing of the over-fire-air is non-uniform in the flow field, the ash combustible substance content in the smoke is high, the content of NOx is high, and the like. An inner air-course valve is arranged at an entrance of an inner over-fire-air air course, an intermediate air-course valve is arranged at an entrance of an intermediate over-fire-air air course, and an outer air-course valve is arranged at an entrance of an outer over-fire-air air course. A share air-course valve is arranged at the communication place of the intermediate and the outer over-fire-air air courses. An intermediate air-course valve is arranged at the entrance of the intermediate over-fire-air air course, and an outer air-course valve is arranged at the entrance of the outer over-fire-air air course. By adjusting the openness of the valves, and under the high load and the low load, good combustion effect can be realized, while the NOx content is reduced.
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Description

technical field

[0001] The invention relates to an overburning air device, which belongs to the technical field of combustion of pulverized coal boilers. Background technique

[0002] NO emissions from thermal power plants x are the three major flue gas pollutants (SO x , NO x and total suspended particulate matter (TSP), has brought a series of environmental pollution problems, seriously endangering the ecological balance and human survival. At present, for most domestic active boilers that do not use overfired air, the NO x The emission level is mostly at 600mg / m 3 around, NO from burning lean coal x The emission level is mostly at 1000mg / m 3 around, the NO of burning low volatile coal x The emission level is mostly at 2000mg / m 3 about. With the increasingly stringent national and local environmental protection policies, various means are used to reduce boiler NO x Emissions are getting more and more attention.

[0003] To reduce NO in furnace flue gas x The co...

Claims

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