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What are the Working Features of Monocular Cooling Machine?

The construction length of the refractory inside the cylinder of the monocular cooling machine accounts for about 50% of the total length of the cylinder, and some part is equipped with lifting device, and the part without refractory is all equipped with lifting plate.

The clinkers are lifted for many times in the lifting area, and evenly thrown about, and the cooling air will have strong heat exchange with the hot clinkers. Especially in the low-temperature area, through improving the structure and arranges patterns of the lifting boards and adjusting the inclination and rotary speed of the cylinder, the contact time of the clinkers and cooling air can be increased and the moving speed of the clinkers can be controlled, so that the heat inside the clinkers will have sufficient time to transmit to the surface, thus sufficiently recycling the heat of the clinkers with low temperature. This type of countercurrent heat exchange working principle is the ideal method for heat recovery of clinkers as the heat recovery efficiency is very high, but there are still problems lifted below.

1. The diameter of the cylinder is big. To reduce the circulation volume of the fine-particle clinkers inside the cooling cylinder and increase the heat recovery efficiency, its cross-section velocity must be limited. This requires that the diameter of the cylinder must be big, which is especially outstanding in the predecomposition kiln system.

2. The slow cooling of the clinkers in the high temperature area leads long length of the cylinder. Due to reason of texture, the temperature for long time use of the lifting board inside the cylinder should be about 900℃, and the temperature of the clinkers discharged from the kiln is generally 250℃~1400℃, which requires to set up a bricklaying zone without lifting board at the feeding mouth end of the cooling machine. This bricklaying zone not only increases the heat loss of the cylinder surface, but makes the clinkers cannot get quenching, thus influencing the quality of the clinkers.

3. There are many problems in the feeding chute of the hot end of the cylinder. As for modern dry process rotary kiln, especially the kiln using multi-channel coal-injection ducts, the temperature of the clinkers discharged from the kiln can be as high as 1350℃, which often crust at the chute end. For this reason, at the chute end there are usually installed many air cannon or timely deals with the crust with high pressure, which will damage the refractory materials.

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