The bottom cover machine generates columnar focal spots
Thread Content
We used the fully automatic bottom cover machine produced by Jian Guang. During the production process, columnar coke was formed (a large columnar mass would be created on the machine), and dealing with this was quite troublesome. Later, a protective sleeve was added to the machine, but columnar coke still formed occasionally. I wonder if other companies have encountered this issue as well; what are the reasons behind it, and how can it be dealt with? Thank you!
We have not yet used an automatic bottom cover machine; occasionally, there is also defocus on the bottom cover, and it’s easier to deal with it using a pneumatic hammer. I think the problem with the bottom cover is mainly related to the manufacturing process or the properties of the materials used; it seems to have little to do with the equipment used.
The columnar coking product is a column-shaped mass with a diameter of 1.8 meters and a height of nearly 1 meter, produced on a bottom-cover machine; it shows signs of incomplete reaction, resembling a giant super-black chocolate cake； Columnar coke can cause difficulties in moving the bottom cover machine, preventing the trolley from moving; manual intervention using tools such as levers is required to break it up, and this process takes over an hour, affecting the coke production cycle and the safe operation of the equipment.
The valves produced by Jian Guang are equipped with an air seal at the bottom; when this air seal is opened, a flow channel can be formed at the bottom cover, preventing coking and blockage of the same. It is possible to check whether coking has occurred in the gas seal inlet pipeline. Similarly, a low temperature at the outlet of the heating furnace and insufficient preheating temperature before switching the coke tower can also lead to coking at the bottom cover of the coke tower. Therefore, it should be checked. As for the other reasons, it’s due to the excessive weight of the raw materials and an insufficient reaction gas flow rate. This post was last edited by kouliang on 2009-3-8 at 12:48.]
Yes, we have been driving it for almost a year now, and everything is working well； Columnar coking refers to the formation of columnar coke \"only on bottom-cover machines,\" with somewhat incomplete reaction, resembling a giant super-black chocolate cake ； The quality testing of the product from the entire coke tower was satisfactory; the volatile content was around 8%. No oil sticking occurred during the cooling process with water, and insulation was added to the flanges of the bottom cover mechanism ；
The bottom preheating temperature is insufficient； The purging time at the bottom feed is too long, resulting in excessive temperature drop ； The furnace outlet temperature is too low.
It is preliminarily judged that the purging time at the bottom feed was too long, the temperature dropped too much, or the time taken to switch to the four-way valve after closing the oil discharge valve was excessive.