Regarding the temperature issue of the rapid sulfur melting tank
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Our company’s rapid sulfur melting tank is equipped with 8 sets of coils for heating, and steam at 0.8 MP and 180 degrees is fed into these coils. During heat retention, the temperature of the sulfur melting tank can be maintained between 135 and 145 degrees. However, whenever production continues with continuous feeding, the temperature of the sulfur melting tank drops rapidly, reaching around 100 degrees only, which causes the sulfur to clump together and prevents continuous production. How can this problem be solved so that continuous feeding for production is possible?
We have two sulfur melting tanks, each with four coils; the steam applied to them has a pressure of around 4 to 5 kilograms. A bypass is opened periodically for drainage, even though there are steam traps in place. When the pressure rises to 145–150 degrees, sulfur is started to be added; the temperature then gradually drops. When it falls to around 110 degrees, adding sulfur is stopped, and it is resumed once the temperature rises again. If the sulfur is in granular form, 500–600 tons can be added per day, 24 hours a day. However, if the quality of the sulfur is poor, especially gray sulfur with a high moisture content due to rain, only 200–300 tons can be added
Hehe, it might be that the heat exchange area isn’t sufficient; increasing the heat exchange area will do, hehe – just add more sets of coiled tubes for heating. But it’s best to check the hydrophobicity first; if there’s no time to do that, try opening the bypass a bit
It might be a hydrophobicity issue; check it out； And what is the size of the groove? Calculate whether it is necessary to add coils to increase the heat transfer area.
By checking the equipment in our project, we found that there are 30 sets of heating coils in the sulfur melting tank, and the designed feeding rate is around 25 t/h. It’s unclear whether we have too many coils or if you have too few (the dimensions of the sulfur melting tank are 18*4.2*3.5). From what was mentioned above, the issues can be investigated from two aspects: 1) whether the heat transfer area is sufficient, and 2) whether the drain valves are functioning properly.
Reply to 4# jimian23: I know the size of the rafters, but I don’t know how to calculate it. Could you give some guidance?
Reply to 5# yusmile: I’m starting to check the hydrophobicity now… The heat exchange area should be sufficient. Because originally production was normal and the temperature drop wasn’t significant; it’s only recently that the temperature has dropped sharply, resulting in extensive caking
The problem is that at our temperature, it happens too quickly; as soon as sulfur is added, the temperature in the sulfur melting tank drops to 70 degrees
Have your steam traps been replaced? Also, check whether there are large numbers of woven bags or other debris on the heating coil that could affect the heat exchange efficiency; these two aspects need to be examined. The heat exchange area in the design should not be taken into consideration; people from design firms are not that incompetent.
I also have a few questions: 1. Is the temperature affected by the slag at the bottom of the tank, and to what extent? 2. Our company’s original design called for the molten sulfur to flow from the molten sulfur tank into the filtration tank, but due to slow flow rates, it was decided that the molten sulfur should flow directly into the assistance filtration tank through a valve at the bottom of the molten sulfur tank. Will this have any impact? 3. Has the liquid level in your company’s molten sulfur tank reached the height of the coils? As far as I know, our company’s tank level has never reached that height before. Thank you all
We have so much sulfide slag in our fast-melting tank; a few days ago we replaced the coil, and after welding it back together, it’s no longer possible to put anything inside