catalyst
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When the catalyst is in its later stages of use, is it necessary to control the heating rate when restarting operation after a long period of shutdown followed by heating?
It is essential to strictly control the rate of temperature increase. Many facilities are eager to speed up the process, raising the temperature of the coal contact layer within just a few hours, which has a significant impact on the service life of the coal contact layer. Additionally, care must be taken to ensure that the rates of pressure increase and decrease are not too fast.
Long-term shutdown has a significant impact on the catalyst; its activity at the high temperatures prior to shutdown is much lower than before. It is advisable to keep the heating rate between 20 and 30; even if you want it faster, it should not exceed 40.
Long-term parking does have an impact on the catalyst, but I believe that the heating rate should be controlled at a steady pace; however, it’s not necessary to keep it too low. In our company, the heating rate for the glycol synthesis tower was usually around 60, and sometimes it reached 100. Controlling the heating rate is primarily to ensure uniform thermal expansion of the equipment, thereby preventing damage caused by asynchronous expansion. As long as the speed is uniform, the rate can still be increased.
Controlling the heating rate does not take into account the catalyst itself entirely; rather, it focuses on the rates of thermal expansion inside and outside the catalyst. A large temperature difference between the inside and outside of the catalyst leads to uneven expansion, which reduces the catalyst’s strength, causes it to become powdered, and lowers its activity
It is necessary to control the rate of temperature increase; this process is equivalent to the activation of the catalyst
Controlling the rate of temperature increase and decrease with a catalyst is a basic requirement for operation!