Can hydrogenated dry gas be directly injected into the reflux drum at the top of the distillation tower?
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Can hydrogenated dry gas be directly injected into the reflux drum at the top of the distillation tower? Could it cause the crude gasoline pump to become vacuumed? Rich gas, components of hydrogenated dry gas?
We inject the gas from the reflux tank at the top of the fractionation tower into the dry gas desulfurization tower. You’re thinking in reverse; I’m also waiting for an expert to explain whether it’s possible.
First, it is necessary to analyze the sulfur content in the dry gas; an excessive sulfur content can result in high sulfur levels in the products obtained in the distillation tower, such as naphtha. Fuel gas is typically used as a pressure control medium in distillation towers
As long as the temperature and pressure are appropriate, there is no issue from a technical standpoint; this practice is indeed used in actual production, and it will not cause the pump to empty. As for its composition, it generally contains a relatively high amount of H2S (which is related to the sulfur content of the raw materials), with the rest being C1, C2, C3, C4, C5, H2, etc.
It is acceptable if the sulfur content in the dry gas is within the specified limits; however, too high a sulfur content can cause the sulfur content in light naphtha to exceed the allowed levels. However, our fractionator top reflux drum is generally pressurized using fuel gas. The main components of hydrogenated dry gas are hydrogen, C1, C2, C3, C4, and a small amount of C5.
The pressure control in the fractionation tower is achieved using gas seals; it must be gas that has been desulfurized, otherwise it will affect the quality of the naphtha at the top of the tower. The hydrogen-rich dry gas stream has a relatively high content; it is best not to send it to the top reflux tank of the distillation column before desulfurization, as this can affect the quality of the product at the column top. However, it will not cause the pump to experience vacuum conditions.