Do the heat exchangers for the sulfur process gas have sulfur seals on both the shell side and the tube side?
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The last edit to this post was made by sxf1028102800 on 2016-10-23 at 14:05. The flow of the process gas through the heat exchanger is as follows: The process gas coming out of the first converter enters the inlet of the tube side of the process gas heat exchanger; it then exits from the outlet of the tube side and goes into the second cooler. The process gas exiting the second cooler enters the shell side of the heat exchanger, and from there it proceeds to the second converter. The liquid sulfur in the tube side of the process gas heat exchanger enters the liquid sulfur tank through a sulfur seal device, while no such seal device is installed on the shell side of this heat exchanger. I believe that the process gas coming out of the secondary cooler contains some liquid sulfur, which then enters the shell side of the process gas heat exchanger. Over time, wouldn’t there be a significant amount of liquid sulfur accumulated in the shell side? But in the shell side of our process gas heat exchanger, there is no sulfur seal device connected to the liquid sulfur tank; I can’t understand why. Please, experts, could you explain this? Thank you; extra points appreciated
We share one for both processes; there are jacket valves before the sulfur sealing stage that can be switched, and generally, there is more liquid sulfur in the tube side when the load is low.
Checking the previous drawings, there is a drain for the shell side. No sulfur seal was applied.
The process gas flow in our plant works as follows: The process gas coming from the Claus furnace first passes through two sections of waste heat boilers； It then passes through the first-stage sulfur condenser {the process gas flows through the tube side (the cooled sulfur enters the first-stage sulfur seal vessel and then goes into the liquid sulfur tank), while the low-pressure boiler feed water flows through the shell side} ； The gas phase exiting the first-stage sulfur condenser enters the first-stage reaction feed heater (process gas flows through the tube side, low-pressure steam flows through the shell side, and low-pressure condensed water enters the shell side of the first-stage sulfur condenser) ； The gas phase emerging from the heater splits into two streams that enter the first converter, where the resulting gas phases then merge back into one stream ； The gas phase emerging from the primary converter enters the secondary sulfur condenser (the subsequent process follows that of the primary stage). . . ） ； The gas phase emerging from the secondary converter eventually enters the final sulfur condenser; the cooled liquid sulfur passes through the third sulfur sealer and goes into the liquid sulfur tank, while the gas phase is sent to the exhaust gas treatment unit. . . . . . . The largest proportion of liquid sulfur comes from the primary sulfur sealer, followed by that from the secondary sulfur sealer; the smallest amount comes from the tertiary one. However, the tertiary sulfur sealer is the most prone to clogging (as it uses a jacket for heating)
Our old units don’t have sulfur-sealing tanks either, but they do have on-site discharge valves, which are used to regularly drain the liquid from the on-site tanks for cleaning