A combustion-supporting method for an oxygen-enriched device of a cement rotary kiln burner

Abstract

The invention discloses a combustion-supporting method of a rotary cement kiln burner oxygen enrichment device. The rotary cement kiln burner oxygen enrichment device consists of a kiln head outer layer pipeline, a kiln head outer layer air inlet pipe orifice, a kiln head coal layer current pipeline, a kiln head pulverized coal wind current pipeline, a kiln head coal wind pipeline, a kiln head inner wind pipeline, a kiln head inner wind air inlet pipe orifice, a kiln head oil pipeline, an oil nozzle, kiln head refractory concrete and a kiln head oxygen enrichment air flue, wherein the oxygen enrichment air flue is arranged between the kiln head outer layer air inlet pipe orifice and the kiln head inner wind air inlet pipe orifice; an air inlet of oxygen enrichment is preserved in the pipe end of the kiln head oxygen enrichment air flue in the kiln head outer layer air inlet pipe orifice; when the oxygen enrichment in the kiln head outer layer pipeline and the oxygen enrichment in the kiln head inner wind pipeline enter a rotary cement kiln together with pulverized coal wind current simultaneously, the temperature of a combustion field of the rotary cement kiln input with the oxygen enrichment can reach over 1700 DEG C, before free carbon in the combustion field with the temperature of over 1700 DEG C forms black smoke, the free carbon is thoroughly burned, and the free carbon becomes combustive fuel; meanwhile, the clinker catalyst of cement is subjected to oxidation combustion by the input of the oxygen enrichment; when the temperature of the combustion field is over 1700 DEG C, CO in the combustion field is burned, and the emission of NOx is reduced by 35%.

Description

technical field [0001] The invention relates to a coal-fired burner device for a cement kiln, in particular to a combustion-supporting method for an oxygen-enriched burner device for a cement rotary kiln. Background technique [0002] The three-channel and multi-channel calciner burners use the jet flow method composed of direct current and swirl flow to strengthen the pulverized coal combustion process. The swirling flow of the internal wind can cause internal backflow in the center, so as to entrain high-temperature smoke. In the initial stage, the rotating jet has high turbulence intensity, strong mixing, and rapid momentum and heat transfer. Coal and wind are transported at high pressure, with high concentration of pulverized coal, low flow velocity, and small air volume. In this way, the heat required for ignition is relatively small, so it has good ignition performance; the external air adopts DC wind, and the early turbulence intensity of DC jet flow It is not very ...

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Problems solved by technology

[0003] The present invention solves the high energy consumption caused by the incomplete combustion of coal in the burner of the cement rotary kiln, which cannot be discharged in an environmentally friendly way; the inferior coal with a low combustion rate will aggravate the inexhaustible combustion of the coal in the calciner and increase the coal consumption. The discharge of exhaust gas also increases; through reasonable design, a combustion-supporting method for the oxygen-enriched device of the cement rotary kiln burner is provided to provide oxygen-enriched combustion for the pulverized coal in the cement decomposition furnace, and the pulverized coal burner coal in the cement kiln The combustion of pulverized coal has a more sufficient amount of oxygen, which increases the combustion rate of pulverized coal, reduces the ignition point of pulverized coal, reduces the air volume of the burner, the temperature field in the furnace increases the flame temperature, and the fuel burns more completely; the coal saving rate reaches 10. %; the kiln tail burner of cement kiln burns pulverized coal in an oxygen-enriched atmosphere, the content of CO in the flue gas decreases, and the content of NO_x decreases with the degree of oxygen enrichment; the emission of NO_x is reduced, and the coal saving rate reaches 15%. left and right to ensure the normal operation of the cement kiln

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