In the calcination process of lime rotary kiln, the temperature control has always been a problem, at least for many cement production enterprises. The selection and control of the temperature index is related to the quality of the calcined lime in the cement production line. Therefore, observation and control are performed by skilled operators. The following is a solution to the low temperature of lime rotary kiln.
When the calcination temperature of the lime rotary kiln develops from normal to low temperature, the fire color becomes darker and the black shadow moves forward. Coal should be added in time. When the material changes from less to more, the flame shortens, and the back of the sintering zone changes from bright to dark. Coal should be added early. With the increase of pulverized coal, the primary air should also be increased to ensure that the pulverized coal is fully mixed and burns quickly and completely. At this time, the calcination zone of the lime rotary kiln showed: the flame is slightly short and powerful, the fire color is brighter than normal, the skin of the rotary kiln is white, the shadow is close, the fine powder in the clinker increases, and it will rise when it exits the cooler it has large dust, and the clinker is green-grey.
If the above temperature cannot be stabilized and continue to develop to a low temperature, the small local car should be closed as soon as possible. After the local car is turned off, the small exhaust air should be properly closed to keep the tail temperature unchanged and the flame concentrated. Otherwise, the temperature will continue to drop, the fire color will change from pink to red, and the fine powder of clinker burned will continue to increase. It will not roll well, and the structure of black-green clinker will be loose. If this happens, you must use a large slow kiln, close the small exhaust, and burn the lime rotary kiln. Otherwise, the temperature will be lower and the clinker will lose its rollability like sand. If it slides down the kiln wall, waste products will be produced. Cause loss to production. In the event of such a situation, the method of stopping burning (that is, stopping the kiln burning) should be adopted. This is a special measure that must be taken as a last resort. Generally, it is strictly prohibited.
The temperature in the lime rotary kiln is low. Except that coal and machinery can not stop the kiln, most of them are caused by improper handling of the fire. In order to prevent this phenomenon, the main thing is to strengthen the operation of watching the fire, to practice basic skills, and to make the technology perfect.
