The Rotary Kiln is the widely applicable calcination equipment for various industry fields like mining industry, chemical industry, construction material industry and metallurgy industry and so on. The hot gas is generated from burner installed on kiln inlet, which is through burning of different fuel like heavy oil, coal and nature gas and so on. The temperature range can be 1000-1600 degree centigrade. The gas flowing inside kiln will directly influence the fuel combustion and heat exchange processing, and also affects the normal operation of rotary kiln and the quality and capacity of the final production.

The gas flowing direction inside rotary kiln will be from kiln inlet to kiln outlet. There are two kinds of methods to prompting the flow: one is natural ventilation, which is using the draft producing from chimney to make gas flowing inside the rotary kiln; another one method is forced ventilation, which is using draught fan drive to make gas flowing inside the rotary kiln. At present most of the rotary kiln adopts the later method.

When gas from kiln inlet flowing to kiln outlet along with the axial direction inside rotary kiln, the temperature and composition of the gas have been changed continuously, then the gas flowing speed have always been changed continuously. The gas flowing speed, on one hand, will influence the heat exchange coefficient, then influence the thermal rate, kiln capacity and heat consumption; on the other hand, will influence the fly ash generating volume, then influence the raw material consumption coefficient. When flowing speed is high, heat exchange coefficient increased, but the connected time of gas and raw material will be reduced, then total heat exchange volume will be reduced accordingly, finally the exhaust gas temperature will increased with higher heat consumption and more fly ash generation; oppositely, flowing speed will be reduced with lower heat exchange coefficient and lower capacity.

The resistance of the gas through the kiln shell will be mainly come from the fluid frictional resistance. The volume of resistance in the kiln mainly depends on the size of the gas flowing rate. In general condition, the rotary kiln fluid resistance is 5 - 10 pa per meter. Also, "zero" pressure points of rotary kiln will be controlled nearby kiln inlet, then the pressure necessary of kiln outlet can be roughly estimated according to the length of the kiln.

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