Why is the main reason for the drop in the high-level liquid level the decrease in the amount of circulating hydrogen?
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As the title suggests, why is the decrease in the high-pressure liquid level mainly due to a reduction in the amount of circulating hydrogen?
A higher hydrogen circulation rate leads to a higher liquid level, while a lower hydrogen circulation rate results in a lower liquid level
A larger amount of recycled hydrogen increases the recycling capacity, shortens the residence time of the oil produced in the reaction system, and may lead to an increase in the liquid level over a short period of time. Conversely, if the amount of circulating hydrogen is low, the liquid level will also decrease in a short period of time. But eventually, balance will be achieved.
Is it related to the height of the gas-liquid separation layer? A larger circulation volume results in a higher separation layer height and thus a higher liquid level； Conversely, the liquid level is low.
There is definitely an impact; is it the main reason?
Are you referring to the low liquid level? Under normal conditions, the automatic mode should be activated, and the valve will adjust itself based on the liquid level; the amount of circulating hydrogen should remain constant, so it shouldn’t have a significant impact on the liquid level
The high liquid level has no relation to the hydrogen circulation rate; unless the hydrogen circulation rate is very low, approaching the critical value for driving force, it has no impact – in that case, the hydrogen-to-oil ratio becomes too low. The main reason lies in whether the yield of high-grade products and the amount of hydrogenation feed are in balance.
The amount of circulating hydrogen generally does not experience significant fluctuations; the extent of these fluctuations matters, as minor fluctuations have little impact on the liquid level. It is usually closely related to the pressure in the upstream feed system.
I agree with what this fellow cultivator said; another point is that a smaller circulation volume may lead to a greater depth of reaction, resulting in dry gas