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

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...

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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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