White cement clinker bleaching process high in waste heat utilization rate

Abstract

The invention discloses a white cement clinker bleaching process high in waste heat utilization rate. High-temperature clinker discharged from a rotary kiln is guided into a water-cooling bleaching machine and a grate cooler through a distribution device; the clinker entering the water-cooling bleaching machine is subjected to water cooling to 500-600 DEG C, sent to the middle rear section of thegrate cooler from a discharging end and subjected to air cooling to 80-100 DEG C, and the cooled clinker is conveyed to a clinker silo by a chain bucket conveyor (5). The problem that heat generated in cooling of the clinker from 600 DEG C to 80 DEG C does not play a role in bleaching and is not used in water-cooling bleaching in the prior art is effectively solved. The clinker cooled to 600 DEG Cin water-cooling bleaching is further subjected to air cooling in the grate cooler to make use of high-temperature air generated in air cooling, and accordingly waste heat utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of white cement bleaching, and in particular relates to a white cement clinker bleaching process with high waste heat utilization rate. Background technique [0002] After the Portland cement clinker is fired at high temperature, it needs to be cooled rapidly by air cooling to ensure that the clinker has good physical and mechanical properties, while the white Portland cement usually needs to be sprayed with water (or drenched in water or soaked in water) to increase the glass body to improve the temperature. Clinker whiteness (ie bleaching). Compared with rotary kiln calcining ordinary cement clinker, rotary kiln calcining white cement clinker is wasted due to water cooling, and the heat carried by clinker becomes water vapor. Since the rotary kiln cannot provide secondary air and tertiary air for calcination, As a result, the calcination of white cement clinker needs to consume more heat, and the output i...

AI Technical Summary

Problems solved by technology

The patent with the application number CN201310692725.7 discloses a material-distributing white cement clinker cooling process, which intersperses and installs a telescopic feeder at the front end of the grate cooler, and the feeder divides the high-temperature clinker that falls from the rotary kiln. 20%~60% of the clinker particles in the feed are introduced obliquely into the discharge port on the side of the grate cooler, enter the rotary bleaching machine, and are cooled to 100~300°C by spraying water, and the remaining clinker particles are air cooled to 80°C by the grate cooler. ~100°C, through this process, the defect of no secondary air and tertiary air in the calcination of traditional white cement clinker can be solved, and the whiteness requirement of white cement can be guaranteed at the same time; After spraying water to cool to 600°C, and then water cooling to normal temperature, the whiteness of the clinker will not change. At this time, the heat of the clinker from 600°C to normal temperature will all evaporate with the water vapor, causing the part The heat is not used and wasted

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