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Correct operation of grate cooler layer thickness

Date:2019-07-19 14:39     writer:cement editor     Views:

The grate cooler in cement production line is responsible for cooling, conveying and heat recovery of clinker from kiln.The normal operation of grate cooler is related to the design, manufacture, installation and maintenance of the equipment.
 

1. Premise of normal operation


The operation of grate cooler should ensure its safe and normal operation.According to the running condition of kiln system, the cooling air quantity and grate bed running speed should be adjusted in time to maintain stable layer thickness. The selection and adjustment of layer thickness should be based on the principle of obtaining the best clinker cooling effect and the highest second or third air temperature, so as to obtain higher cooling efficiency, heat utilization rate and equipment operation rate.

2. Influencing factors of layer thickness


The grate cooler requires the operation technology of thick material layer.Firstly, there is enough heat exchange time between cold air and high temperature clinker.The second is to use the thick material layer, so that the resistance of the system increased, cooling wind consumption is small, to obtain a higher second and third wind temperature.It depends on the grate load and the residence time of clinker in grate cooler.Generally, the thickness of the first, second and third sections of the 5000t/d pre-decomposition kiln production line should be controlled within 650 ~ 850mm, 500 ~ 650mm and 350 ~ 400mm respectively.

The thickness of material layer is reflected by pressure display of grate downwind system.At the same time can also be combined with the host current, oil pressure curve comprehensive analysis.In the first section of the grate cooler, a layer thickness monitor is usually installed. Through the change of the upper surface of the layer and the relative height of the wear-resisting pier on the side wall of the grate cooler, the accurate thickness of the layer in the high temperature area can be determined.

The control of layer thickness is realized by changing the grate velocity (i.e. pushing frequency).If the grate bed speed is slow, the material layer is thick and the clinker cooling is slow.

In practice, in addition to judging and controlling the thickness of the layer according to the above principles, it should also be noted that the thickness of the layer is affected by the change of the temperature, batching rate and particle composition of the kiln.When the material is easy to burn, the melting enzyme mineral content is high, the calcination temperature in the kiln is high, and the material layer should be appropriately thin to prevent the material from agglomerating in the high temperature area.When flying sand or low sintering, should be thick control to prevent short circuit cold air phenomenon.If material thickness too thin, cooling air volume control and larger at the same time, while good for increase clinker strength, low air temperature, two, three times affect the flame shape and pulverized coal combustion, and prone to "flow" in grate cooler, "steam", or "sanding" phenomenon, increase the heat consumption of clinker, neither economic impact due to the appearance of the powder again see the line of sight of fire workers.

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