Views:8 Author:Site Editor Publish Time: 2021-05-13 Origin:Site
Kiln Shell Introduction
The kiln shell is the main body of the rotary kiln. The kiln shell steel plate has a thickness of about 40mm. It’s near the tire ring. Because the bearing capacity is relatively large, the kiln shell steel plate here is thicker. The interior of the kiln shell is covered with a layer of refractory bricks of about 200 mm. When the kiln shell is in operation, due to the high temperature and load-bearing, the kiln shell will have an elliptical deformation, which will exert pressure on the kiln bricks and affect the life of the kiln bricks. At the end of the kiln, about one meter long is tapered, so that the material from the preheater feed chamber can enter the kiln more smoothly.
When the kiln is running, the heating rate of the kiln shell is higher than that of the tire ring, and the labor must control the heating rate of the rotary kiln at 50 ° C / h, which is beneficial to protect the kiln brick. Usually, the roller is 50-100 mm larger than the wheel. The roller bearing is made of Babbitt. If the bearing loses lubrication, the bearing will burn out due to the excessive temperature. There is cooling water at the bearing for circulating cooling. In order to reduce the heat radiation of the kiln shell to the tire ring and to cause overheat riding wheel. So a heat insulation plate is added between the two to reduce heat radiation. Rotary kiln generally has 2 to 3 sets of rollers.
Kiln Shell Function
The function of the kiln shell is to protect the kiln lining of the externally heated rotary kiln, to reinforce the structure of the electric kiln and to maintain the tightness of the electric kiln, usually by welding the steel plate to the steel frame. For small experimental kiln. There could be no kiln frame, and the kiln shell is welded with a thin steel plate, which can also play the role of kiln frame. The thinness of the kiln shell is at 2-6mm.
The kiln bottom is made of thick steel plate, but the sidewall can be made of thin steel plate. Intermittent welding is generally used in addition to a protective atmosphere or a controlled atmosphere kiln.
The function of the kiln is to withstand the load of the kiln lining and the workpiece of the externally heated rotary kiln and the side thrust of the kiln arch. The steel plate is wrapped. The well-designed kiln frame and kiln shell should have sufficient strength. Some bad manufacturers often cut corners or use thin plates instead of thick plates to make profits.
It can be seen that the kiln shell of the externally heated rotary kiln is capable of withstanding the load capacity and reducing the burden on the kiln. The kiln frame is to protect the important parts in the kiln, strengthen the sealing. The components complement each other and together play an important role in the efficient operation of the furnace.
There is a difference in thermal conductivity between the rotary kiln shell and the tire ring. Only a deeper understanding of the subtle relationship between the rotary kiln shell and the tire ring can better play the role of the kiln shell and the tire ring.
The tire rings, support rollers, bearings, tire rings and support rollers in the rotary kiln structure are used to support the weight of the kiln. The tire ring is sleeved on the kiln shell, and it is not fixed on the kiln shell. The kiln shell and the tire ring are separated by an iron plate to keep a certain gap between the tire ring and the kiln shell. It can’t be too small. If the gap is too small, the expansion of the rotary kiln shell is limited by the tire ring, and the rotary kiln brick is easily damaged. If the gap is too large, the relative movement between the kiln shell and the tire ring and the friction is more harmful, and the elliptical deformation of the kiln shell is more serious. It is usually necessary to add lubricant between the two. The degree of elliptical deformation of the kiln shell can be estimated by the relative motion between the rotary kiln shell and the tire ring.
An external windmill must be used between the rotary kiln shell and the tire ring to help the kiln shell to dissipate heat, and balance or reduce the temperature difference between the two. The heating rate of the rotary kiln shell is higher than that of the tire ring.
As we can see, the kiln shell is very important to the rotary kiln. It’s a protection to the rotary kiln is irreplaceable. The right installation and maintenance must be done.