Destination of the overhead gas from the hydrogenation unit’s distillation tower
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The vapor from the stripping tower of the hydrogenation unit is sent to the dry gas desulfurization unit for recovery, but what happens to the vapor from the fractionation tower’s top? If going to the furnace, how should the hydrogen sulfide contained be dealt with?
Generally, the vapor from the top of the distillation tower should be free of hydrogen sulfide, as the stripping tower is capable of removing it completely. If there is concern, the vapor from the top of the distillation tower can be washed with an alkali before being sent to the gas distribution network.
It is usually a twin-tower setup: T1 contains high levels of sulfur in its acidic gases, while T2 contains almost no sulfur. Natural gas is generally used as the gas seal, and it is sent to the furnace; each has its own burner.
We use stripping hydrogen at the bottom of our distillation tower; as a result, hydrogen accounts for about 60% of the gas phase at the top of the distillation tower. We send this gas phase from the top of the distillation tower to the reforming unit, where the hydrogen is recovered and reused!
What is the typical pressure level for distillation column pressure among everyone? We maintain the control pressure in our diesel hydrodesulfurization distillation column at 0.05–0.01 MPa; as a result, the stripping in this distillation column can only take place in the low-pressure system
In diesel hydrogenation, there isn’t much vapor at the top of the fractionator; the furnace is designed accordingly； The overhead gas from the gasoline hydrogenation distillation column contains no hydrogen sulfide
I’m talking about diesel hydrogenation; the pressure in the fractionation tower generally does not exceed 0.1 Mpa. If it’s to be sent for reforming or to the fuel gas network, then compressors are needed, right? ? ?
The pressure is set at 0.1 Mpa; generally, the power consumption is reduced – where else can it be lowered?
It’s not easy to operate if you go straight to the furnace for heating; usually, a low power setting is used, and the amount of heat generated isn’t large either