Describe in detail the process of desulfurization and alkali replacement in delayed coking
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For exams, urgent, thank you! Pre-alkaline wash sedimentation tank!
This post was last edited by ylb913 on 2015-12-3 08:47: 1. Change the liquefied gas inlet to an upper inlet (to prevent liquefied gas from entering the alkali rejection zone). 2. Control the amount of alkali rejected based on the volume of fresh alkali solution (calculate in advance the control points for interface changes). 3. Alkali removal. When necessary (such as during timed supply of liquefied gas), and when it is required to maintain a stable output from the liquefied gas processing unit, the processing volume of liquefied gas should be increased appropriately while carrying out the alkali removal process, At the same time ensuring that the rate of alkali removal is not too fast. 4. Alkali supplementation. Improve the process, start the pump to add alkali, and reduce the LPG feed rate if necessary. 5. After completion, switch the liquefied gas back to the lower inlet (to increase the contact time between the liquefied gas and the alkaline solution); then replace the alkaline solution in the pump with water, flush it out, and empty the pump (to prevent the alkaline solution from crystallizing, which could affect the mechanical seal)
1. Change the liquefied gas inlet to an upper inlet (to prevent liquefied gas from entering the alkali removal zone). 2. Control the amount of alkali removed based on the volume of fresh alkali solution (calculate in advance the control points for interface changes). 3. Alkali removal. When necessary (LPG is supplied only on a timed basis) and it is required to stabilize the output volume of LPG from the plant, while carrying out the alkali removal process, the processing volume of LPG should be increased appropriately, At the same time ensuring that the rate of alkali removal is not too fast. 4. Alkali supplementation. Improve the process, start the pump to add alkali, and reduce the LPG feed rate if necessary. 5. After completion, switch the liquefied gas back to the lower inlet (to increase the contact time between the liquefied gas and the alkaline solution); then replace the alkaline solution in the pump with water, flush it out, and empty the pump (to prevent the alkaline solution from crystallizing, which could affect the mechanical seal)