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During the operation of the cement rotary kiln, faults such as egg accumulation, flying sand, snowman making, and ring formation often occur. These failures not only affect the operation of the kiln but also affect the service life of the lining refractory material. To solve these problems, it is necessary to clarify the formation mechanism of these faults and destroy the formation conditions of the faults, so as to achieve the purpose of high yield, high quality, and low consumption.
Today we will talk about the ring formation problem of cement rotary kilns. The former and the latter are divided into three types. Among them, the most difficult to deal with is the rear ring.
front ring problem
The front ring is the ring connected to the cooling zone. When the material in the kiln enters the cooling zone from the firing zone, a part of the clinker that cannot be completely solidified on the kiln skin is formed on the surface. If it is not dealt with in time, it will accumulate and develop into an anterior ring.
Henan Xinhongji Refractory Material Co., Ltd. summed up some experience of ring forming before processing
①When the current ring-forming position is far away from the discharge port, it is mainly due to the ring formed for a long time before the coal injection pipe. During the process, the coal injection pipe is pulled out, and the temperature of the kiln head is raised appropriately to make the front ring burn.
②When the current ring-forming position is close to the discharge port, it is mainly due to the ring formed after the long-term setting of the coal injection pipe. During the treatment process, pull out the coal injection pipe, increase the internal flow air and secondary air volume appropriately, and increase the temperature of the secondary air. In this way, the calcination temperature can be increased, the sintering zone can be moved forward, and the temperature of the front ring can be increased. When the temperature of the front ring is raised and the viscosity of the liquid phase is lower than that of the kiln material, the front ring will be gradually ground by the kiln material after 2-3 hours.
③ If the former method cannot burn the front ring, the coal supply, coal supply, and secondary air volume can be appropriately reduced. When the tail temperature is low, pull the coal injection pipe to the outermost side, and aim the nozzle at the solid combustion. After the poorly pre-fired material at the kiln tail enters the firing zone, the flame can be shortened, and the front ring is forced to burn.
④ Always observe the treatment before treatment, pay attention to the change of incoming materials, increase or decrease coal consumption according to the calcination situation, adjust the flame shape, and prevent kiln skin damage, loss of raw materials, or burning of refractory materials or electromechanical equipment.
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