Secondary air oxygen-enrichment pulse combustion gas spraying device and method of rotary kiln

Abstract

The invention relates to a secondary air oxygen-enrichment pulse combustion gas spraying device and method of a rotary kiln. The device comprises a plurality of oxygen-enrichment spray guns which are fixed to a kiln hood of the rotary kiln. The end, corresponding to the oxygen-enrichment spray guns, of the portion, located in a cooling zone, of a kiln lining is provided with air inlets of an oxygen-enrichment secondary air channel. Outlets of the oxygen-enrichment secondary air channel are formed in the inner wall of the portion, located in a firing zone, of the kiln lining. The kiln lining and the oxygen-enrichment secondary air channel are formed by pouring refractory castable integrally. The method comprises the steps that when the oxygen-enrichment spray guns and the oxygen-enrichment secondary air channel coincide, valves are opened to spray gas, and when the oxygen-enrichment spray guns are moved away from the oxygen-enrichment secondary air channel, the valves are closed, gun spraying is stopped, and then the oxygen-enrichment pulse combustion pulse process is completed. Compared with the prior art, the secondary air oxygen-enrichment pulse combustion gas spraying device and method of the rotary kiln have the advantages that through butt joint between the oxygen-enrichment spray guns and the oxygen-enrichment secondary air channel in the rotating process of the rotary kiln, oxygen-enriched air is supplied to the firing zone for after-combustion, the flow of the oxygen-enriched air is controllable, air supply is even, the oxygen-enriched air entering the kiln is fully preheated so that the combustion efficiency can be further improved, and the purposes of utilizing waste heat, eliminating pollution, saving energy and reducing emission are achieved.

Description

technical field [0001] The invention relates to the technical field of oxygen-enriched combustion in a rotary kiln, in particular to a rotary kiln secondary air oxygen-enriched pulse combustion gas injection device and method for building materials such as cement and lime and sintered pellets. Background technique [0002] At present, in the production of coal-based rotary kilns, coal consumption basically accounts for more than half of the entire production cost. How to reduce coal consumption is directly related to the economic benefits of production enterprises. Under natural conditions, combustion needs to consume oxygen to complete. In conventional combustion, only 20.9% of the oxygen in the air participates in the combustion process, while 78% of the nitrogen in the air will absorb a large amount of heat released by the combustion reaction and discharge it as flue gas, causing serious damage. Environmental pollution and energy waste; at the same time, the combustion of...

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Problems solved by technology

Insufficient secondary air will lead to reducing atmosphere, which will affect product quality

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