The rotary cement kiln is the most vital device in a cement plant, it is the place where the raw meal is burnt and calcined into cement clinker. Cement rotary kiln plays a variety of roles in the cement production line at the same time. It is not only a combustion device, but also a heat exchange device, a chemical reactor, and a conveying device.
The rotary cement kiln we supply is the most ideal cement kiln for the new dry process of cement manufacturing. It has perfect performance on clinker production of ordinary portland cement, white cement, portland pozzolana cement, and so on.
Over decades, our company has been summarizing experience, improving production technology, and updating production equipment in the process of designing and building rotary kiln for customers. Until now, we have successfully added the following advantages to our rotary cement kilns:
2. We use compound fish scale to soft seal the front end and the back end of the rotary cement kiln. The air leakage coefficient can be thus controlled less than 10. It also helps to meet the environmental protection requirements.
Cylinder: The cylinder is the body of the rotary kiln. It is covered by the kiln shell, which is made of welded steel. Inside the shell, there is a refractory lining to prevent the shell from melting down.
Tyre: The tyre is also called riding ring, it is a steel ring mounted on the kiln shell to support the kiln. The thickness of the kiln shell increases around the tyre to prevent deformation caused by the pressure of the tyre.
Roller: The rollers are mounted on a massive cast iron or steel base plate which provides the inward horizontal forces on the rollers and distributes the weight of the kiln over the pier. The spacing between the rollers has to be small enough to prevent large horizontal forces, but large enough to keep the kiln laterally stable.
Kiln Seal: Because the rotary kiln operates under the condition of negative pressure, and there are gaps in the places where the cylinder is connected with the kiln hood and the smoke chamber, the sealing device must be installed on both the front end and the back end to prevent air leakage and material leakage.
Kiln Hood: The function of the kiln hood is to gather the clinker temperature during the operation, prevent the clinker from overflowing, and with the help of the exhaust fan, send the hot air from the cooling machine into the kiln through the kiln hood, so as to make full use of the heat and reduce the fuel consumption.
The raw meal fed into the cylinder body, affected by the rotation of the cylinder, continuously rolls and moves along the axial direction, passing through the three above zones in turn. The calciner installed at the front end of the kiln injects fuel into the cylinder and heats the raw meal. The flue gas generated in the process is discharged from the back end of the kiln. The raw meal is heated in the process of moving. And after a series of physical and chemical reactions, it becomes a qualified clinker and is discharged from the front end of the kiln.
The operation efficiency of the rotary cement kiln will be affected if its parts are worn. At this time, rotary kiln maintenance must be carried out to repair or replace the worn parts. Large-scale maintenance takes a long time, usually 10-20 days. During the overhaul, it is necessary to replace all the worn parts, inspect and adjust all the units (such as replacing the important parts such as cylinder section, ring gear, wheel belt, idler, etc., and aligning the kiln center line, etc.).
4. The diameter of the supporting wheel and the hydraulic thrust roller is worn by 20%, or the thickness of the supporting wheel rim is worn by 25%; the rim is ground into a cone or other special shape, or the rim has through cracks. When replacing the supporting wheel and retaining wheel, the corresponding liner must be scratched or replaced again.