Operation and Treatment at Knot Ball of Rotary Kiln

Kneading occurs in the rotary kiln (Also known as knot) for the raw material composition of the volatility, excessive liquid phase, the original, fuel, sulfur chlor-alkali content is high, feeding instability leads to the end of the kiln, the decomposition furnace temperature suddenly high, Low fluctuation of pulverized coal quality, poor homogenization effect, negligence of operator, and improper temperature control or long delay time and other aspects of reasons caused by.

Its preventive measures should choose the appropriate ingredients program, stable raw material ingredients. Generally high lime saturation coefficient, high silicon rate of raw materials will avoid the occurrence of the phenomenon of the ball, and calcined clinker quality is also good. However, this material refractory, and the level of operation requires a higher.
Low lime saturation coefficient and low aluminum rate of raw materials, it is relatively narrow sintering range, while the amount of liquid phase is too large, coarse grain, a little less will lead to the ball. So the production as much as possible in the choice of two high and one of the ingredients in the program, that is, high KH, high n, the p, this ingredient is easy to operate and clinker quality is relatively stable.

At the same time choose the lower the harmful components of the original fuel materials, especially coal. Strengthen the pre-homogenization of coal, to meet the production requirements as possible while reducing the fineness of coal. Calcination process to strengthen the mixing of wind and coal, try to avoid excessive coals caused by incomplete combustion of coal. If the usage of lower volatile coal, because of its slow fire, burning a long time, the fire intensity is not concentrated, this time should try to reduce the fineness and moisture of coal.

If the kiln has formed a material ball, this time should not be too anxious, should be appropriate to increase the ventilation kiln and the flame flow. At the same time pay attention to the temperature control of the kiln, so that it is not too high, can be slightly reduced kiln coal, to ensure complete combustion of coal. And the appropriate reduction in feed volume, slightly lower kiln speed, so that the material inside the kiln roll into the firing zone, until the material reached the firing zone after the ball, and then reduce the number of kiln speed, with a fire in a short time to burn down, So as not to enter the chiller block or smash the grate plate, this time should pay special attention to the situation of kiln skin, this method is only applicable to the material when the ball is relatively small.

If the ball is large, you can use cold and heat alternate method for processing. When the material in the transition zone with the ball, it is not easy to climb up the kiln skin into the firing zone, then the coal into the coal pipe into the appropriate to reduce the amount of feed, burn 1-2 hours, and then pull out the coal pipe and then burn 1-2 hours, again and again, until the material ball rupture.

Rotary kiln ring of the factors are many, only timely detection, timely treatment, and the correct way, knot problem can be truly resolved to achieve high-quality rotary kiln, high yield, low consumption, safety, civilized production.