Fire broke out in the exhaust gases at the surface of the sulfur pool in the sulfur recovery system
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In the past two days, the waste gas above the liquid sulfur tank has kept catching fire, and once a fire breaks out, only steam from fire suppression systems can be used to put it out. It is manifested as a sharp rise in temperature at a certain point in the liquid sulfur tank. It caught fire in the end. A fire broke out once after starting the liquid sulfur pump. It caught fire at night even without any layers. I don’t know what the reason is. Let the experts from various fields analyze it
It should be the spontaneous combustion of ferrous sulfide upon contact with air. In the event of a fire, we increase the nitrogen flow (a small amount is used normally), and there is also a device for degassing liquid sulfur through gas extraction. Now, for sulfur liquefied gas degassing, we use the off-gas from the absorption tower outlet and send it to the hydrogenation reactor.
The causes of fires in liquid sulfur degassing tanks are mostly due to the natural formation of ferrous sulfide! Moreover, your description also mentions that there will be a sudden rise in temperature in certain areas; it is recommended to check for corrosion in the steam coils if possible. I have a question: isn’t the liquid sulfur off-gas tank of yours evacuated? How could air get in? Otherwise, the three conditions for combustion won’t be met, right? I also recommend checking out: https://bbs.hcbbs.com/thread-646096-1-1.html https://bbs.hcbbs.com/thread-644836-1-1.html https://bbs.hcbbs.com/thread-1308285-1-1.html
The liquid sulfur tank is equipped with an extractor that sends the waste gas to the combustion furnace. However, the liquid sulfur tank is not sealed. The pool cover is a cement cover with large gaps
It is recommended to ensure proper sealing. Reduce air intake
Air stripping is often used for the degassing of liquid sulfur; even if the liquid sulfur tank is well-sealed, air still manages to get in.
It must have caught fire after sulfur condensed; what is the temperature at which you maintain heat tracing? It is presumed that the mechanical seal of the liquid sulfur pump may be damaged, which led to high temperatures and resulting fire; we have encountered this phenomenon before.
It should not be the solidification of sulfur that causes the fire; rather, it is the fire that leads to a significant increase in the viscosity of liquid sulfur, resulting in the liquid sulfur pump being overloaded and damaged. The cause of the fire remains ferrous sulfide.
Has the sulfur tank degassing been sent to the flue gas furnace? Is there an alkali washing unit behind the exhaust furnace? Is the degassing done using a gas pump or by self-pressure? Can the temperature of the heat tracing coil circuit in the sulfur tank melt solid sulfur?
Now, most of the off-gases from liquid sulfur degassing tanks come from improved reaction furnaces!