Method and device for graded cooling of high-temperature granular materials

Abstract

The invention discloses a high-temperature particulate material stage cooling method. According to the method, a feed inlet of a cooling material bed is transversely divided into an upper area and a lower area by a retaining wall the bottom of which is suspended, particle classification and quenching are conducted on high-temperature particulate materials discharged from a rotary kiln with airflow, coarse particulate materials obtained after classification fall into the upper area of the feed inlet of the cooling material bed to form a coarse particle material bed for thick material bed countercurrent heat exchange, fine particulate materials obtained after classification fall into the lower area of the feed inlet of the cooling material bed, and the coarse particulate materials subjected to countercurrent heat exchange enter the lower area of the feed inlet of the cooling material bed through the bottom of the retaining wall to be cooled on the cooling material bed together with the fine particulate materials in the lower area. The invention further discloses a high-temperature particulate material stage cooling device adopting the method. The high-temperature particle classification technique is adopted, the coarse particles are cooled on the thick material bed, the amount of cooling air can be reduced, the heat recovery efficiency of a system can be improved, and then energy is saved.

Description

technical field [0001] The invention belongs to the technical field of thermal equipment, and relates to a method and device for graded cooling of high-temperature granular materials. Background technique [0002] The output of many industrial kilns is high-temperature granular materials, such as cement clinker, lime, alumina clinker, iron ore sinter, etc., which need to be cooled and recovered. Improving heat recovery efficiency is the direction of continuous improvement of coolers. [0003] Taking cement production as an example, the cooler is one of the important equipment of the cement firing system, which undertakes the tasks of cooling, conveying and heat recovery of cement clinker. The push grate cooler is currently a widely used type of cooler, and its development has gone through the first, second, third, and fourth generations, and its gas-solid heat transfer method has always been cross-flow heat transfer. The material layer thickness of the third-generation and...

AI Technical Summary

Problems solved by technology

However, the particle size distribution of the clinker leaving the rotary kiln is wide, and the fine particles are filled in the gaps of the coarse particles, which makes the resistance of the material layer larger. A large increase in the thickness of the material layer will inevitably lead to a significant increase in the resistance of the material layer, thereby increasing the power consumption of the system.

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