Nozzle for reducing nitrogen oxide emission of aluminum oxide roasting furnace

Abstract

The invention discloses a nozzle for reducing nitrogen oxide emission of an aluminum oxide roasting furnace. The nozzle comprises a nozzle body, wherein the nozzle body is composed of a front tip part and a rear round part; the nozzle body is hollow, an opening is formed in the rear portion of the rear round portion, and through holes are formed in the front tip portion and evenly formed in the front tip portion. The through hole is arranged around the axis direction of the front tip part in the circumferential direction; and the through holes are uniformly formed in the extension direction of the outer wall of the front tip part. According to the nozzle, the fuel gas amount of a single spraying hole is small, and flames are short; the combustion areas are stacked layer by layer and are uniformly distributed; a combustion area is relatively large, so that a local high-temperature area is avoided; the nozzles extend out of the inner wall of the furnace wall, a smoke backflow area is formed between every two adjacent nozzles, the temperature and the oxygen concentration of a combustion area in the furnace can be effectively reduced, and therefore generation of thermal type nitric oxide is effectively restrained.

Description

technical field [0001] The present invention relates to a nozzle, in particular to a nozzle for reducing the emission of nitrogen oxides from an alumina roasting furnace. Background technique [0002] Domestic alumina production enterprises mainly use gaseous suspension furnaces, circulating fluidized roasting furnaces, etc. to process aluminum hydroxide in the alumina roasting system. The flue gas generated by roasting is recovered and processed by electrostatic precipitators. Oxides are processed through a desulfurization and denitrification system to meet emission standards. [0003] The country's environmental protection policies are becoming more and more perfect, and the emission requirements are becoming more and more stringent. "Aluminum Industry Pollutant Emission Standards" GB25465-2010 Amendment List requires that the emission limit of nitrogen oxides, measured as NO2, for the aluminum hydroxide roaster of alumina plant is ≤100mg / m3. Some regions have stricter r...

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Problems solved by technology

[0006] Usually, the V19 nozzle adopts the long flame technology, so that the gas is concentrated in the center of the roaster, and there are many defects, such as a long flame, a small combustion area, and the temperature is easy to be too high, etc.

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