Timing points for establishing each cycle of catalytic fuel injection
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When using catalytic fuel injection, should the fractionation system first establish a top circulation system or a middle-stage circulation system? Why?
First, establish a primary reactor; the temperature at the top of the tower can be controlled through cold reflux
We first establish the top loop and then the middle section. Because the temperature at the top of the fractionation tower rises rapidly, it is easy to establish an overhead circulation, whereas it often takes a long time for the extraction temperature in the middle section to increase.
We also start by using coarse gasoline to establish a circulation; when drawing liquid from it, the temperature rises slowly, which makes it easy for water to be carried along and prevents complete evacuation
It is more difficult to establish top circulation; we start with top circulation for cyclic dehydration. If we start with the middle section first, the temperature of the entire tower rises more slowly, which affects the quality of the product in terms of timing.
Cold reflux is controlled at the tower top, while the slurry is controlled at levels 30 and below. As for which system – top circulation or stage one – is established first, it depends on which oil collection tank first reaches a liquid level and the pump no longer runs dry; generally, top circulation is established before stage one. In the past, we would first fill oil into the top circulation system and No.1 unit while continuously removing water, and then start the pump to establish circulation when needed.