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Gas seal issue

2020-12-27View Original

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Hello everyone. Next are the flare gas-liquid seal tank and drain tank before the flare system. What is the working principle of these tanks? The flare gas-liquid seal tank is used to prevent backflow, but what about the drainage tank? Under what circumstances does it work? I would appreciate your guidance.
Reply #22020-12-28
Looking at the diagram, something is still missing; it is recommended to check the pressure parameters and other process parameters for each section, as well as the flow direction of the medium in each line. For reference.
Reply #32020-12-28
This gas seal groove is equipped with an overflow funnel as well as a heating and insulation tube. It normally overflows into the discharge tank through the overflow funnel, and the operation of the discharge tank is monitored by checking the overflow sightglass at a higher position. The gas seal tank is equipped with both local and remote level gauges (both of which have insulation), and an overflow pipe is also provided to lead to the discharge tank. Is it because the freezing point of this material is too low or its viscosity is too high? In case the liquid level indication is inaccurate, is it possible to determine the condensate condition of the equipment on-site using an on-site sight glass? There’s also a bypass for the main flare gas stream’s drain that is normally closed. Based on the diagram, I really can’t figure out how the flare gas gets out; actually, it’s you I should ask about this:D
Reply #42021-01-03
You made me send this picture; it’s exhausting to look at. The principle is simple: the inlet pipeline of the torch gas-liquid seal tank is placed below the liquid level, while the outlet pipeline is above it. If backflow occurs and the flame travels back through the pipeline to the outlet pipeline, the flame is interrupted because the inlet pipeline is below the water surface, which prevents backflow to that pipeline. Based on your flow diagram, the drainage tank can be considered to function either by continuously draining the liquid level in the flare gas-liquid seal tank or through overflow

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