Classification and maintenance of cement rotary kiln
Author: changdeli Machinery Factory
Release time: 15:12, July 18, 2017
Introduction to rotary kiln:
Cement rotary kiln It belongs to building materials and equipment, and is a kind of lime kiln. It belongs to building materials and equipment, and is a kind of lime kiln. Rotary kiln According to different materials, it can be divided into cement rotary kiln, metallurgical chemical rotary kiln and Lime rotary kiln 。 Cement rotary kiln is the main equipment of cement clinker dry process and wet process production line.
Classification of cement rotary kiln:
According to the different heating methods, it can be divided into internal heating and external heating.
The materials of the inner heating rotary kiln are in direct contact with the flame and flue gas, and the oxidation or reduction atmosphere in the furnace can be realized by adjusting. The inner wall of the cylinder is built with refractory bricks, the lining of the head and tail cover is made of high-strength wear-resistant castable, and the flexible seal between the head and tail cover and the cylinder body can completely eliminate dust and leakage. It can adopt multi-stage support to make the cylinder length reach 60m and the maximum service temperature can reach 1600 ℃. The output is large, and the applicable fuels are liquefied gas, natural gas, gas, fuel oil, pulverized coal, coal, etc.
Maintenance of cement rotary kiln:
The material of external heating rotary kiln is not in direct contact with flame and flue gas. The heat source is between the furnace and the cylinder. The material is heated by heat transfer of heat-resistant steel cylinder wall. The lining of heating furnace is made of refractory fiber, which can save energy and reduce consumption. Limited by the heating mode and cylinder material, the cylinder length is generally less than 15 meters, and the heating temperature is not more than 1200 ℃. The output is small, the suitable heating methods are: electric heating, gas, fuel oil, coal, etc.
During the operation of rotary kiln, the parts will be worn with the extension of time, which will reduce the reliability of equipment operation and even affect the output of rotary kiln. Therefore, it is necessary to take the opportunity of maintenance to recover. According to the maintenance workload, it can be divided into major repair, medium repair and minor repair. According to the use and maintenance of the rotary kiln, each user works out large, medium and small repair plans. The focus is on minor and medium repairs. The maintenance work can be carried out when the kiln is stopped to replace the kiln lining. Only the maintenance of the transmission device can be carried out after the bricklaying work is completed. But it should also be completed quickly in a short period of time (such as 8-12 hours). For overhaul, it will take a long time. At this time, it is necessary to replace all the loss parts of the kiln, check and adjust the whole equipment (such as: replacing the kiln shell section; replacing the big gear ring, wheel belt, supporting wheel, kiln head, kiln tail sealing parts, etc.), but it must be noted that all the parts and tools to be replaced should be prepared before the planned shutdown to reduce the maintenance time.
Wear of the ball of supporting roller pad seat:
In the operation process of rotary kiln, the wear of bearing seat ball is caused by the fracture of bearing bush. After the problem occurs, the traditional method can not be effectively repaired on site. Replacing new spare parts not only requires high cost, but also requires long-time shutdown for spare parts, which will cause heavy losses to enterprises.
2211f polymer metal repair material has super strong adhesion, excellent compressive strength and other comprehensive properties. Using 2211f metal repair material, it can quickly repair the wear of tile seat ball without machining. In other words, there is no influence of welding thermal stress, and the repair thickness is not limited. At the same time, the metal material of the product does not have the yielding property, which can absorb the impact vibration of the equipment, and can make the fitting surface 100% contact, avoiding the possibility of wear again.
Cracks on the ball of supporting roller pad seat:
Due to the accidental frost crack of the ball of the supporting wheel and the cast iron, the traditional method can not be used to repair it. Scrapping and replacement not only requires high cost, but also requires a long time of downtime for spare parts, which will cause heavy losses to enterprises.
2211f polymer metal repair material has excellent adhesion, excellent comprehensive mechanical properties, and good resistance to water, oil and chemical media. 2211f polymer metal repair material was used to repair the ball of supporting roller pad of rotary kiln.