Large tilt rotary kiln cement calcining process and rotary kiln

Abstract

The present invention discloses a kind of great tilt rotary kiln and its cement calcining process. After black raw material pellet produced in traditional technological process is fed into the kiln,the material pellet is first dried, preheated, dewatered and carbonate decomposed in the preheating belt; and then calcined into cement clinker via solid and liquid chemical reaction in the calcination belt. Calcined cement clinker is cooled in cooling belt and crushed in crushing cavity before discharged out of the kiln. The rotation of the kiln makes the material contact with oxygen homogeneously and this results in homogeneous quality and high yield of cement product.

Description

Technical field: [0001] The invention relates to a calcining process and equipment for cement production. technical background: [0002] The process of calcining cement clinker in rotary kiln, whether it is wet method, dry method or semi-dry method, the calcination process of materials in the kiln firing zone is basically the same. The biggest advantage is that the materials (blocks) are constantly turned in the kiln with the rotation of the kiln, the heat transfer is uniform, the reaction is sufficient, the quality of the fired clinker is stable, there are many effective minerals and the distribution is reasonable, and the strength is high. However, the common problems of rotary kiln are low filling rate of materials in the kiln, high calcination temperature, low thermal efficiency and large energy consumption. The kiln with preheater and the decomposition process outside the kiln are advanced technologies in the world, but the investment is large and the technology is com...

AI Technical Summary

Problems solved by technology

[0005] 2. Due to the kiln wall effect produced by the structure of the kiln body, the material pressure and section distribution of each zone and layer is uneven, resulting in large ventilation resistance and uneven ventilation in the kiln. inhomogeneity;

[0006] 3. After entering the cooling zone, there is also uneven cooling, which is not conducive to the rapid cooling and crystal transformation of part of the clinker, and reduces the strength and grindability of the clinker

Occurs from time to time during the operation of the shaft kiln, such as partial fire, overhead, kiln collapse, spray kiln, etc. causing personal casualties, etc., which further exposes the shortcomings of the shaft kiln process

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