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Coal gasification and reburning efficient denitrification system for cement decomposing furnace by high-temperature triple air

A cement decomposition furnace, coal gasification technology, applied in the direction of granular/powder fuel gasification, gas treatment, separation methods, etc., can solve problems such as poor denitration effect, avoid secondary pollution, reduce ammonia escape, and reduce consumption. Effect

Active Publication Date: 2017-08-29
INST OF MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In order to solve the problem of poor denitrification effect of the existing cement kiln, the present invention provides a high-temperature tertiary air coal gasification reburning high-efficiency denitrification system that can improve the denitrification effect of the calciner of the cement kiln

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  • Coal gasification and reburning efficient denitrification system for cement decomposing furnace by high-temperature triple air
  • Coal gasification and reburning efficient denitrification system for cement decomposing furnace by high-temperature triple air

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Embodiment Construction

[0023] Such as figure 1 , 2 As shown, the denitrification system according to one embodiment of the present invention generally includes a decomposition furnace 1 and a high-temperature tertiary air pipe 9 .

[0024] The calciner 1 is connected with the coal injection pipe 13 of the main combustion area, and the raw meal feeding pipe 12 of the lower raw meal; ℃), release heat to decompose the raw meal.

[0025] The high-temperature tertiary air pipe 9 communicates with the main combustion zone of the calciner 1 to provide combustion-supporting high-temperature air (900-1100° C.) for pulverized coal combustion. It is used to divert the high-temperature air in the high-temperature tertiary air pipe 9, and the unconnected end of the branch pipe 3 respectively leads to the coal gasification pipe 6 and the burn-out air pipe 4 connected with the reburning zone and the burnout zone of the calciner 1, and connects the high-temperature tertiary air pipe 4 between the branch pipe 3 an...

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Abstract

The invention discloses a coal gasification and reburning efficient denitrification system for a cement decomposing furnace by high-temperature triple air. The coal gasification and reburning efficient denitrification system comprises a decomposing furnace and a high-temperature triple air duct, wherein the decomposing furnace is provided with a main combustion zone coal-injection duct and a cement raw material discharging pipe; the high-temperature triple air duct communicates with a main combustion zone of the decomposing furnace for providing combustion-supporting wind; a branched pipe extending to the upper part is connected onto the high-temperature triple air duct; a coal gasifying pipe and a burnout air duct which communicate with a reburning zone and a burnout zone of the decomposing furnace are respectively educed from the unconnected end of the branched pipe; a first high-temperature adjusting valve is arranged at a connecting part of the branched pipe and the high-temperature triple air duct; a second high-temperature adjusting valve is arranged at the unconnected end of the branched pipe; a coal gasification coal-injection pipe and a water steam spraying-in pipe are respectively connected onto the gas gasifying pipe. Large-sized equipment does not be refitted if the coal gasification and reburning efficient denitrification system is adopted, so that investment is less; by using gas as a reburning fuel, the efficient denitrification system has high denitrification efficiency and the characteristics of economy and high efficiency.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a high-temperature tertiary air coal gasification reburning denitrification system of a cement decomposition furnace. Background technique [0002] Cement kiln is a typical high-emission industrial furnace, especially the emission of nitrogen oxides. The cement industry has become the third largest source of nitrogen oxide emissions after electricity and automobiles. With the rapid development of my country's economy, the demand for cement remains high, resulting in increasing nitrogen oxide emissions, and the country's nitrogen oxide emission standards for the cement industry are becoming more and more stringent. In 2004, the "Emission Standards of Air Pollutants for the Cement Industry" stipulated that NO x The emission should be less than 800mg / Nm 3 ; In 2013, the state promulgated the "Cement Industry Air Pollutant Emission Standards", which has more stringent standa...

Claims

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Application Information

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IPC IPC(8): C10J3/48B01D53/56B01D53/76
CPCB01D53/56B01D53/76B01D2251/204B01D2251/208B01D2258/0283C10J3/48
Inventor 李森孙立超魏小林葛逸飞
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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