Engineer, design, construct, test and evaluate a pressurized fluidized bed pilot plant using high sulfur coal for production of electric power. Phase I: preliminary engineering. PFB combustor/heat exchanger rig test at Leatherhead

Technical Report · Thu Dec 01 04:00:00 EST 1977

DOI:https://doi.org/10.2172/5905304· OSTI ID:5905304

A test of 100 hour duration has been carried out in the pressurized combustor at Leatherhead, England, to investigate the behavior of a heat exchanger and distributor plate designed and fabricated by Curtiss-Wright and Dorr-Oliver. The heat exchanger consisted of seven large diameter, vertical, finned tubes in a fluidized bed of 8 ft. depth. Datum operating conditions were: pressure, 6 atm absolute; fluidizing velocity, 2 1/2 ft/s; and bed temperature, 1600/1650/sup 0/F. Bed temperature was also varied over the range 1450/sup 0/F to 1730/sup 0/F. Temperature distribution in the bed was extremely uniform (+- 30/sup 0/F or better) with no evidence of significant clinkering or poor fluidization. Combustion efficiency at datum conditions was 98 1/2 to 99%, with little, if any, combustion in the freeboard. The outside (bed to tube) heat transfer coefficient for the central tube cooled by air, calculated using NRDC test data, was approximately 45 Btu/hr ft/sup 2/ /sup 0/F. The overall heat transfer coefficiency between the gas and air averaged 21.8 Btu/hr ft/sup 2/ /sup 0/F. Dolomite was fed at a typical Ca/S mol ration of 1.6. Equilibrium was only reached towards the end of the test, when a sulphur retention of 85% was approached. The coal was Illinois No. 6. NO/sub x/ emissions were typically 150 ppM. Start-up was demonstrated at a bed depth of 6 ft. with this heat exchanger, whereas beds with horizontally oriented tubes have required shallow bed depths for starting fluidization.

• Research Organization: National Coal Board, Leatherhead (UK). Coal Utilization Research Lab.; Curtiss-Wright Corp., Wood-Ridge, NJ (USA). Power Systems Div.
• OSTI ID: 5905304
• Report Number(s): FE-1726-30A; CW-WR-76-016.30A
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200100* -- Fossil-Fueled Power Plants-- Power Plants & Power Generation
ALKALINE EARTH METAL COMPOUNDS
BURNERS
CARBON COMPOUNDS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
COMBUSTORS
DATA
DATA FORMS
DESIGN
DOLOMITE
ENERGY TRANSFER
ENGINEERING
EXPERIMENTAL DATA
FLUIDIZED-BED COMBUSTORS
FOSSIL-FUEL POWER PLANTS
HEAT EXCHANGERS
HEAT TRANSFER
INFORMATION
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERALS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POWER PLANTS
RESERVOIR ROCK
ROCKS
TABLES
TEMPERATURE DISTRIBUTION
TESTING
THERMAL POWER PLANTS