Liquid level control scheme for the buffer tank of diesel and gasoline blended hydrogenation feedstock oil
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The unit has three feed streams: accelerant, normal fuel, and normal steam, which are fed in simultaneously in proportion. When liquid level control is used, and while ensuring a stable liquid level in the raw material tanks as well as stable properties of the raw oil, I would like to know what the operating status of each of the three feed control valves is – are they all active at the same time? How is this liquid level automatically controlled?
Personal understanding: Isn’t it a bit confusing for the buffer tank level signal to control three feed streams at the same time? Fixing two circuits and connecting one in series should make operation easier, right?
It can be changed to a level outlet control regulating valve for automatic operation.
A proportional controller can be added to ensure that each feed stream is supplied in the same proportion; this is one possible approach. The specific method depends on the requirements regarding feeding in the system
It is quite complex to control the liquid level with three control valves simultaneously, as there is a significant degree of mutual influence among them. Adjusting the three control valves simultaneously has a direct impact on the three lines upstream, and it affects the operation of the upstream equipment