How to handle light hydrocarbons in lean liquid
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In my system, the gas phase coming out of the hydrogen sulfide gas tower is separated first, and then this gas phase enters the lean liquid desulfurization tower for hydrogen sulfide removal. However, in actual operation, there is always a certain amount of oil present in the liquid level of this tower. Please analyze the reasons for this, and discuss how to remove the oil stored in the tower at any time so as not to affect the desulfurization efficiency.
This problem is likely caused by the presence of light hydrocarbons in the sulfur-containing gases; poor separation in the top reflux tank of the hydrogen sulfide stripping tower leads to this issue, and excessively high reflux temperatures can also cause it.
There are mainly a few aspects. 1. Control the temperature and reduce it to an appropriate level. 2. Increase the volume of the reflux tank. 3. Regularly remove oil from the interface in the reflux tank. 4. Control the pressure of the hydrogen sulfide stripping tower, etc.
In the gas phase, it is best to send it to the reflux tank at the top of the coking fractionation tower; after passing through the absorption and stabilization system, the oil phase content is reduced.