Preheater rotary kiln exit of each level is also known as the rising pipe tubes Road, cyclone preheater rotary kiln system is the important equipment, bear on the lower cyclone preheater and gas-solid connection between the two flow the delivery mission, and to assume the raw material dispersion, uniform gas, solid two-phase heat transfer tasks, together with cyclone preheater to form a heat exchanger unit.

Rotary kiln Tube Road, particularly raw material new to dust and hot air, the temperature difference and velocity difference is large, the most intense heat exchange, the maximum heat transfer efficiency, so the transformation of the Tube channel is very important. Rotary kiln system piping should be designed to ensure that the heat transfer time and space, and evenly dispersed raw material good focus, but also should be able to put the crude raw material has a good adaptability to improve the grinding system of production, grinding to reduce power consumption.

Rotary kiln Tube Road should be within the reasonable range of wind speed, wind speed is too low, although prolonged heat exchange, but the impact of heat transfer efficiency, or even make the raw material is difficult to build up the settlement of suspended, and the rotary kiln pipe size is too large; wind speed too high, then increase the system resistance, increase the system's power consumption. In addition, the wind speed rotary kiln tubes tract should be put under raw material fineness after crude to determine the raw material powder in the course of the campaign can be graded, coarse raw material powder reduce the velocity, appropriate to extend its pipeline residence time and improve the efficiency of heat transfer.

When the rotary kiln heat exchange channel through the floor, the radius can be used when necessary, change the way one can take full advantage of the existing framework, to reduce the cost of civil structures dealing with the other hand, also increase the flow of the "ripple effect", which will help heat the exchange.