The importance of rotary kiln sealing device

Rotary kiln is a large sealed material calcination equipment, kiln head or kiln tail if the sealing effect is poor, will affect the kiln material normal calcination, resulting in clinker quality decline. Such as kiln head leakage into the excess of cold air, it will reduce the clinker cooling equipment into the kiln secondary air volume, and reduce the temperature of the secondary air, clinker cooling negative, and the kiln flame temperature will be reduced, thus affect the fuel combustion rate, increase heat loss.

If the kiln leaks, due to the large negative pressure, easy to inhale a lot of cold air, a large number of kilns cannot be exhaust gas, fuel cannot be completely burned, resulting in thermal system damage, increase fuel consumption and exhaust fan load, and Increase power consumption, reduce kiln production and affect the safety and efficiency of electric dust collection. In particular, kilns with various preheaters will reduce the temperature of the exhaust gas entering the preheater, thus affecting the thermal efficiency of the preheater.

Therefore, the performance of the sealing device is good or bad, the kiln system of normal operation and kiln quality and energy consumption are of great significance. The following requirements are required for the sealing device.

1. Better sealing. Kiln head at the negative pressure is small, in the vicinity of zero pressure, sealing requirements can be lower. But the kiln at the negative pressure is higher, dry preheater kiln up to 150-1000Pa, wet long kiln up to 300-1500Pa, so the sealing device can adapt to such negative pressure.
2. Under the premise of ensuring the reliability of the seal, the structure should be well adapted to the normal operation of the cylinder and the normal kiln head up and down movement, radial run out, cylinder center line bending and manufacturing error, kiln temperature Thermal expansion and contraction, cantilever bending slightly bending and other requirements.
3. Parts wear should be small, the use of the cycle to be long, because the kiln seal airflow temperature is high, dust and more difficult, easy to wear. In the shape of the design, to avoid fouling place, in the material requirements can be high temperature, wear, to prevent leakage of lubricants.
4. In the structure to be simple, easy to manufacture, long-term and reliable work, easy maintenance.