l sulfur production from sulfur

This post was last edited by ylb913 on 2016-11-26 at 13:40. When sulfur production is halted, catalyst hot soaking is required; what kind of process gas is used for this soaking, and what is the medium used for combustion? ——This involves burning normal acidic gases; by increasing the air supply slightly, the temperature of the catalyst bed is raised by 15 degrees, thereby driving out the liquid sulfur present in the catalyst bed. ——At normal operating temperatures, theoretically, there should be no liquid sulfur in the catalyst bed, but in practice there is always a slight difference; this is related to the concept of sulfur dew point. What is the process gas required for sulfate reduction using a sulfur catalyst, and why is it called sulfate reduction? ——This is a concept from a very long time ago; it no longer exists in reality today. Firstly, there is the concept of sulfation, which is usually caused by peroxides. After sulfation, the catalyst loses its activity for the Claus reaction; at this point it is necessary to reduce the air supply and use the remaining hydrogen sulfide to reduce the sulfated catalyst back to its alumina state. Originally, the equipment was repaired once a year, and shutdowns for maintenance could even take place at any time; the environmental regulations were not strict, and there were few requirements regarding operating procedures. Additionally, due to the absence of an exhaust gas treatment system, it was normal to operate the equipment under conditions of high oxygen levels over extended periods of time. Currently, maintenance is usually carried out every 3 to 4 years. Exceeding the allowable limits for exhaust emissions is not permitted; the requirements for meeting these standards are also higher. It is not allowed either for operational fluctuations to result in the sulfur treatment system failing to meet the emission standards, which is why prolonged operation under conditions of high oxygen levels is also prohibited.