Stripping and depressurization of solids and gas mixture
This patent describes a method for stripping and depressurizing fine particulates mixed with gas discharged from a vessel operated at elevated temperature and pressure conditions. The method comprising the steps of: receiving and conveying the mixture from the vessel; stripping the particulates of entrained synthesis gas by selectively injecting gas into a means for receiving and conveying the mixture from the vessel; stripping the particulates of entrained synthesis gas by selectively injecting gas into a means for receiving and conveying the mixture from the vessel; maintaining a substantially constant fraction of gas volume to particulates volume in the means for receiving and conveying the mixture; maintaining a higher pressure at a lower end of the means for receiving and conveying the mixture than the pressure of the vessel. Maintaining a higher pressure includes actuating valving means located at a lower portion of the means for receiving and conveying the mixture; decreasing the pressure in the means for receiving and conveying the mixture downstream from the lower end. Decreasing the pressure includes gradually increasing the diameter of the means for receiving and conveying the mixture downstream from the lower end; controlling the mass flow rate of the mixture discharged from the means for receiving and conveying the mixture. The controlling includes determining the mass flow rate of the mixture downstream of the selectively injecting gas into the means for receiving and conveying the mixture, comparing the mass flow rate with a preselected mass flow rate, and adjusting the mass flow rate.
- Assignee:
- Shell Oil Co., Houston, TX
- Patent Number(s):
- US 4877419; A
- Application Number:
- PPN: US 7-098180A
- OSTI ID:
- 7041630
- Resource Relation:
- Patent File Date: 18 Sep 1987
- Country of Publication:
- United States
- Language:
- English
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