System for pressure letdown of abrasive slurries
This patent describes a system and method for releasing erosive slurries from containment at high pressure without subjecting valves to highly erosive slurry flow. The system includes a pressure letdown tank disposed below the high-pressure tank, the two tanks being connected by a valved line communicating the gas phases and a line having a valve and choke for a transfer of liquid into the letdown tank. The letdown tank has a valved gas vent and a valved outlet line for release of liquid. In operation, the gas transfer line is opened to equalize pressure between tanks so that a low level of liquid flow occurs. The letdown tank is then vented, creating a high-pressure differential between the tanks. At this point, flow between tanks is controlled by the choke. High-velocity, erosive flow through a high-pressure outlet valve is prevented by equalizing the start up pressure and thereafter limiting flow with the choke.
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5052426; A
- Application Number:
- PPN: US 7-641988
- OSTI ID:
- 5877430
- Resource Relation:
- Patent File Date: 16 Jan 1991
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
COAL GASIFICATION PLANTS
DEPRESSURIZATION SYSTEMS
COAL LIQUEFACTION PLANTS
CHEMICAL REACTORS
EROSION
FLOW RATE
FLOW REGULATORS
FUEL SLURRIES
GAS FLOW
HIGH PRESSURE
MAINTENANCE
TANKS
VALVES
CONTAINERS
CONTROL EQUIPMENT
DISPERSIONS
EQUIPMENT
FLUID FLOW
FUELS
INDUSTRIAL PLANTS
MIXTURES
SLURRIES
SUSPENSIONS
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