Local oxygen-enriched combustor for cement kiln furnace

Abstract

The invention relates to a local oxygen-enriched combustor for a cement kiln furnace. Through the arrangement of an oxygen-enriched air passage outside an axial flow air passage of the combustor and the arrangement of a spray nozzle at an outlet of the oxygen-enriched air passage, the spray nozzle is arranged at the lower part of the outer side circumference of the air flow air spray nozzle and is near the clinker or analogue side, so the local concentration of the oxygen gas at the contact side of the lower part of the combustor and the oxygen-enriched air passage is raised, the combustion speed of the fuel can be accelerated, the local heat accumulation is directly caused, the adjacent fuel also begins to combust along with the proceeding of the diffusion, heat transfer and heat radiation processes, the temperature of the direct contact side of the clinker or analogue of a rotary kiln with the oxygen-enriched air passage is obviously raised, and the response to the raw material mass fluctuation caused by proportioning can be realized. In addition, a center angle corresponding to a distribution region in the circumferential direction is set to be smaller than or equal to 270 degrees, the angle range can completely cover the region of the fuel and the cement clinker or analogue rotating along with the rotary kiln, and the use precision and the economization of oxygen-enriched air can be ensured.

Description

technical field [0001] The present invention relates to an industrial burner for the production of cement or the like, and in particular to an oxygen-enriched burner utilizing inferior or alternative fuels. Background technique [0002] In recent years, with the continuous expansion of cement production scale and the shrinking of the overall cement market, domestic cement production enterprises have shifted their energy from extensive production to focusing on how to improve the quality of clinker, reduce the production cost of each process link, Reduce exhaust gas and dust emissions. [0003] The coal consumption of the kiln head burner of cement rotary kiln accounts for 30% to 50% of the entire production line. From the perspective of cement production, the consumption of raw materials (ore), fuel (mainly pulverized coal), and electricity are the main components of cement clinker. Cost composition, and for some cement plants, fuel costs even account for more than half of ...

AI Technical Summary

Problems solved by technology

[0011] In view of the fact that the existing burners have poor adaptability to low-quality fuels and low calorific value fuels, low burnout rate, high CO concentration at the outlet of the rotary kiln, and the existing method of enriching the burner with oxygen has large oxygen consumption and thermal energy utilization The problem of low efficiency and high cost borne by users, the present invention provides a burner with additional oxygen-enriched air passages and nozzles, the burner has strong adaptability to changes in fuel quality, and can be used in cement or similar Inferior fuels are used in the production process to achieve the purpose of saving energy, reducing consumption, stabilizing production and reducing costs

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