Compression ignition characteristics of coal slurry fuels

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5125253

Brehob, D D

Slow and medium speed compression ignition engines are devices with the potential for conversion to coal fueling. Recent work focuses on coal slurried in a liquid carrier. Engine studies on coal slurry to date have investigated the slurries' wear, thermal efficiency, and injection performance. Previously lacking information on the compression ignition characteristics of coal slurries, specifically, the ignition delay times and conditions for ignition of 45 mass% coal in methanol, oil, and water are compared to methanol and diesel No. 2. The slurries are evaluated using a 900 rpm, direct injection, square piston engine simulator operating for one combustion cycle per experiment. Both 16:1 and 22:1 compression ratios are used with inlet air temperatures from ambient to 250/sup 0/C and 2 atm abs supercharge. The square geometry accommodates windows on two opposite walls of the combustion chamber for complete optical access. High speed Schlieren, shadowgraphic, and direct cinematography show the qualitative features of the motoring and combusting cycles. The pressure and luminosity defined ignition delay times are 0.7 to 10 msec for the conditions of the experiment. All of the test fuels except coal/water slurry ignited at the operating conditions attainable in the engine simulator. The temperature at time of injection required to obtain ignition is approximately 680 K for diesel No. 2 and coal/diesel slurry, 725 K for coal/methanol slurry, and 825 K for neat methanol.

• Research Organization: California Univ., Berkeley (USA)
• OSTI ID: 5125253
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
02 PETROLEUM
025000 -- Petroleum-- Combustion
ALCOHOLS
CARBONACEOUS MATERIALS
CHEMICAL REACTION KINETICS
COAL
COMBUSTION CHAMBERS
COMBUSTION KINETICS
COMPARATIVE EVALUATIONS
COMPRESSION RATIO
DIESEL FUELS
DISPERSIONS
ENERGY SOURCES
ENGINES
FOSSIL FUELS
FUEL OILS
FUEL SLURRIES
FUEL SUBSTITUTION
FUELS
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
IGNITION
KINETICS
LIQUID FUELS
MATERIALS
METHANOL
MIXTURES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PETROLEUM PRODUCTS
PHOTOGRAPHY
QUANTITY RATIO
REACTION KINETICS
SLURRIES
SUSPENSIONS
TESTING
WATER