China Hongxing Rotary Kilns Introduction

In so-called cyclone preheating plants and succeeding rotary kilns the raw meal is continously heated from ambient temperature to approx. 1500 °C and discharged as granulated cement clinker.

The burning of raw meal to clinker constitutes a complex approach. It consists of precisely defined steps and is regularly monitored. Significant rotary kilns currently is often approx. 6 m across and 100 m long, reaching throughputs of as much as about 10,000 t per unit and day.

The energy carriers made use of for preheating and heating in preheating plants and for “burning” the material in rotary kilns are coal, oil and natural gas. Which of these fuels are ultimately utilised depends on their cost and availability.

Where coal is utilized as energy carrier, coal crushers are often employed in cement plants for size reduction and fine grinding. Generally, these coal crushers are smaller vertical rolling mills similar to those utilised for grinding raw meal. As a rule, quite a few machines are run in parallel operation, grouped into units.

As the roller grinding mills have to cope with highly adverse ambient circumstances the bearings often fail due to wear to ensure that there is certainly a constant demand for new bearings. There is also a constant demand for bearings for beater wheel mills that are applied for coal crushing.

Rotary kilns are commonly radially supported in hydrostatic bearings. Having said that, for some years now, support roller units with rolling bearings have also been made use of, fig. 22. The FAG product Programme includes such units. Axial assistance of the rotary kiln is generally effected by assistance rollers (fig. 23) which in turn are supported in rolling bearings.

As the professional manufacturer of complete sets of mining machinery, such as Screw classifier,China dryers, Henan Hongxing is always doing the best in products and service.