The grate cooler is a type of clinker coolers, it plays an important role in the clinker manufacturing process. The grate cooler in a cement plant cools and transports the cement clinker from the rotary kiln, and provides heating air (secondary air) for the rotary kiln and preheater. The performance of the grate cooler will directly affect the production efficiency, energy consumption, and clinker quality of the kiln system.
The grate cooler belongs to the family of air quench cooler (AQC). The clinker fed into the grate cooler can be quenched from 1300-1400 ℃ to below 100 ℃ in just a few minutes.
The grate cooler can be further divided into three types: the rotary cooler, the traveling grate cooler, and the reciprocating grate cooler. The first two have already been eliminated from the industry; the reciprocating grate cooler is the mainstream clinker cooling equipment in most cement plants today.
As a cement plant manufacturer, AGICO supplies multiple models of reciprocating grate cooler for your cement clinker production!
Grate Cooler Functions
- Provide a proper clinker cooling rate and improve the quality and grindability of the cement clinker. (When the clinker is quenched, one part of the clinker has no time to complete the crystallization and becomes glass phase, and the other part even crystallizes is finer than that obtained by crystallization at normal cooling rate. Such clinker can be made into higher grade cement. And also, because the clinker particles will produce thermal stress and cracks after quenching, their grindability will be greatly improved.)
- Provide hot air to the rotary kiln as the secondary air and to the preheater as the tertiary air; improve the thermal efficiency and reduce the energy consumption of the clinker production line.
- Heat the residual hot air for waste heat power generation and coal mill drying.
- Crush the clinker and quench it to the lowest possible temperature to meet the requirement for clinker transportation and cement grinding.
Grate Cooler Structure
The main parts of a grate cooler include the upper shell, the lower shell, multiple grate plates, the grate transmission device, the grate support device, the clinker crusher (breaker), the automatic lubrication device, and multiple cold air fan units.
Grate Cooler Working Principle
The hot clinker discharged from the rotary kiln falls on the grate bed. Under the push of reciprocating grate plate, the hot clinker is spread on the grate bed to form a material layer.
The reciprocating grate plates are composed of the alternatively arranged fixed grate plates and movable grate plates. Driven by the transmission device, the movable grate plates located between the fixed grate plates in a row make horizontal reciprocating movement to push the clinker forward.
The cold air is blown into the material layer from the lower direction of the bed to cool the hot clinker.
The quenched clinker is then screened. After that, small pieces are fell into the conveyor for transportation; large pieces are crushed into small pieces by the crusher and cooled another time before entering the conveyor.
AGICO supplies following models of grate cement clinker cooler. Inquiry about these products is always welcome!
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After years of practice, grate cooler has been proved to be the most mature clinker cooling equipment at present. It plays an important role in the development of new dry process cement manufacturing technology and further improves the reliability and technical indicators of the cement clinker calcining system.
Please feel free to contact us for more information about the grate cooler! We will respond as soon as possible.