Development of a fluid friction control valve for pressure letdown in hot dirty gas streams
Control valves required for pressure letdown service in future commercial coal conversion plants will be subjected to severe service at a temperature and pressure as high as 1800{degree}F and 800 psig, respectively, in a gaseous environment leading to valve erosion and corrosion. This report describes the design and development of a fluid friction control valve (FFCV) for these severe pressure reduction applications. The FFCV is designed to dissipate friction-induced energy losses uniformly over an extended surface flow path, and thus eliminate pressure reduction taking place in a single-step process. This important feature of the FFCV, by which the fluid mixture velocity is significantly reduced, has the potential of minimizing or even eliminating the problems associated with conventional-type control valves. The component parts of the FFCV exposed to the hot gas flow stream were fabricated from Inconel Alloy 625, a high strength nickel-chromium-molybdenum alloy used in high temperature corrosive environments. The FFCV underwent combined parametric and endurance tests at temperatures and pressures of up to 1500 F and 1000 psig, respectively, at gas stream flowrates of up to 100 lb/hr. To simulate abrasive ash/char particulate as found in conversion plant gas streams, three forms of silica powders were used. Over the course of 53 test runs, the FFCV was subjected to a cumulative endurance test duration of 164 hours, of which 55 hours were with silica particulate in the gas stream. During these tests the FFCV maintained its structural integrity and operated without clogging or jamming. Upon completion of testing, examination of the internal valve surfaces exposed to the gas stream showed no discernable erosion. 1 ref., 23 figs., 3 tabs.
- Research Organization:
- General Applied Science Labs., Inc., Ronkonkoma, NY (USA)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (USA)
- DOE Contract Number:
- AC21-88MC24217
- OSTI ID:
- 5895409
- Report Number(s):
- DOE/MC/24217-2971; ON: DE91002044
- Country of Publication:
- United States
- Language:
- English
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COAL GASIFICATION PLANTS
VALVES
DESIGN
WEAR RESISTANCE
ASHES
CHARS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
COMPUTERIZED SIMULATION
CORROSION
CORROSION RESISTANCE
DEPRESSURIZATION
DISTRIBUTION
EROSION
FLOW BLOCKAGE
FLOW RATE
FRICTION
GAS FLOW
INCONEL 625
MEASURING INSTRUMENTS
MODIFICATIONS
PARAMETRIC ANALYSIS
PARTICLE SIZE
PARTICULATES
PERFORMANCE TESTING
PRESSURE DROP
PROGRESS REPORT
SILICA
SIMULATION
TEST FACILITIES
TWO-PHASE FLOW
ALLOY-NI61CR22MO9NB4FE3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CONTROL EQUIPMENT
CORROSION RESISTANT ALLOYS
DOCUMENT TYPES
EQUIPMENT
FLOW REGULATORS
FLUID FLOW
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
INCONEL ALLOYS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MINERALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM AL
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PYROLYSIS PRODUCTS
RESIDUES
SILICON COMPOUNDS
SILICON OXIDES
SIZE
STAINLESS STEELS
STEELS
TESTING
010404* - Coal
Lignite
& Peat- Gasification