Ash return device

Abstract

The invention relates to an ahs return device, in particular to an ash return device in kiln head of a rotary kiln for returning dust collected by electrical dust collection at the kiln tail of rotary kiln to a burning zone in the rotary kiln in the process for producing an alumina clinker by a serial connection method. In the ash return device, an incoming pipe opening of an external sleeve is provided with an air inlet pipe and a return ash branch communicated with a return ash main pipe communicated with a spray nozzle; and the return ash main pipe and the return ash branch are arranged inthe external sleeve. The device has the advantage that the amount of return ash can be regulated according to product needs no matter two return ash branches work at the same time or a return ash works alone. Each return ash branch has a certain amount of conveying air, so ash in the return ash device can be conveyed to the burning zone in the kiln by the air. Air in the air inlet pipe pushes thereturn ash and cools the spray nozzle. The device can prevent bulk material, ring and thick kiln crust from forming and make the particle size of a kiln material uniform.

Description

technical field [0001] The present invention relates to an ash return device, in particular to a return device at the kiln head of the rotary kiln to return the dust collected by the electric dust collector at the kiln tail to the firing zone of the rotary kiln during the firing process of alumina clinker produced by the series method. gray device. Background technique [0002] Clinker firing is an important process in the production of alumina by the tandem method. Since the material processed by the alumina rotary kiln produced by the series method is the red mud produced by the Bayer process, the ratio of aluminum to silicon is low; during the sintering process, it is easy to generate a liquid phase to make the clinker in a molten state, resulting in the formation of large lumps and rings. And thick kiln skin, affect the normal production of clinker kiln. Contents of the invention [0003] In order to solve the above technical problems, the present invention provides ...

AI Technical Summary

Problems solved by technology

Since the material processed by the alumina rotary kiln produced by the series method is the red mud produced by the Bayer process, the ratio of aluminum to silicon is low; during the sintering process, it is easy to generate a liquid phase to make the clinker in a molten state, resulting in the formation of large lumps and rings. And thick kiln skin, affecting the normal production of clinker kiln

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