The issue of sulfur production shutdowns
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The last edit to this post was made by sxf1028102800 on 2019-8-14 at 10:37. One of the steps in shutting down sulfur production is: blowing sulfur with gas
The purpose of using gas for sulfur removal is to burn off combustible materials in the system through peroxides. When the plant is shut down, the temperature of the furnace is high and the level of peroxide is relatively low; it is only during the subsequent cooling process that the oxygen content gradually increases. When the unit is started up and heated, the temperature is low at first, with a high peroxide level. Therefore, the system flue gas purging should still be carried out during shutdown, as the oxygen level in the system is low at this time, preventing localized overheating.
Unless there are special circumstances, sulfur must be purged during shutdown. If sulfur is not removed, it adheres to the surface of the catalyst; when operation resumes, there will be an excess of peroxides, which will definitely cause the reactor to overheat, affecting the catalyst’s activity and lifespan.
In addition to the reasons mentioned above, sulfur purging in the system is also intended to remove sulfur from elbows, valves, dead ends, and other similar locations, thereby preventing blockages that could prevent valves from opening and cause difficulties during maintenance.
It’s definitely necessary to stop operations for sulfur burning; firstly, this is to prevent sulfur from accumulating on the catalysts, and secondly, it facilitates maintenance work. It usually takes a few days to complete this process. I wonder what will happen if the exhaust emissions are not up to standard during those days? ? ?
Yes, with such strict environmental regulations these days, the sulfur dioxide levels in the exhaust gases during the sulfur-blowing process must be quite high. Could experts please advise on what to do?