Combustion of two-stage coal liquefaction residues in a hybrid boiler. Final report. [High ash liquefaction residues]

Technical Report · Wed Oct 01 00:00:00 EDT 1986

OSTI ID:5060354

Patel, R L; Griffith, B F

A bench- and pilot-scale study has been performed on high ash liquefaction residues (ash concentrates). These residues were prepared beforehand in Wilsonville, Alabama, 6-ton/day test facility, from Illinois No. 6 Burning Star high volatile bituminous and Wyodak (Wyoming-Dakotals) subbituminous coals. A detailed characterization of both residues was conducted using standard ASTM and special in-house techniques. The Drop Tube Furnace System (DTFS) was used to determine the combustion characteristics of both liquefaction residues as well as the combustion kinetics of a closely size-graded Illinois No. 6 residue char. The pilot-scale Fireside Performance Test Facility (FPTF) was used to determine the slagging and fouling characteristics of the Illinois No. 6 liquefaction residue at 2.3 MBtu/hr and temperature and time conditions simulating utility pulverized coal fired boilers. The kinetic information was subsequently used in conjunction with a C-E's proprietary mathematical model to predict the combustion performance of the Illinois No. 6 liquefaction residue in a conceptual hybrid boiler designed for Illinois No. 6 Exxon Donor Solvent (EDS) residue. Liquefaction residue results indicated carbon heat losses ranging up to 2 times those predicted for Illinois No. 6 EDS residue. They, nevertheless, indicated that the liquefaction residue can be successfully burned in a correctly designed and correctly operated hybrid boiler. Pilot-scale FPTF study indicated high to severe lower furnace slagging potential for the Illinois No. 6 liquefaction residue at temperatures above the 2625 to 2650/sup 0/F range. The convection pass fouling potential was low to medium. The fly ash erosion potential was found to be high. Bench-scale results also indicated severe slagging potential and moderate to high fouling potential for the Wyodak liquefaction residue. 25 refs., 32 figs., 22 tabs.

• Research Organization: Combustion Engineering, Inc., Windsor, CT (USA). Power Systems Group
• OSTI ID: 5060354
• Report Number(s): EPRI-AP-4835; ON: TI87920047
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASHES
CHEMICAL COMPOSITION
BOILERS
DESIGN
COAL LIQUEFACTION
RESIDUES
FURNACES
FOULING
COMBUSTION
BENCH-SCALE EXPERIMENTS
BITUMINOUS COAL
EXPERIMENTAL DATA
EXXON LIQUEFACTION PROCESS
PILOT PLANTS
SLAGS
STEAM GENERATION
SUBBITUMINOUS COAL
TSL PROCESS
BLACK COAL
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
COAL
DATA
ENERGY SOURCES
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
INFORMATION
LIQUEFACTION
MATERIALS
NUMERICAL DATA
OXIDATION
THERMOCHEMICAL PROCESSES
014000* - Coal
Lignite
& Peat- Combustion
010405 - Coal
Lignite
& Peat- Hydrogenation & Liquefaction