Development program for producing clean pellet fuel from Ohio coal

Technical Report · Wed Aug 01 00:00:00 EDT 1979

OSTI ID:6831051

This program concerned the development of a new pelletizing process for converting a blend of coal and limestone into a clean pellet fuel (Helifuel). Processing involved grinding and blending coal, limestone, and additives followed by balling and high temperature firing using a Dwight-Lloyd traveling grate processing system. During firing operations the pellets become hardened, depleted of volatile matter, and have sulfur primarily fixed to the ash constituents of the coal. Two species of processing, carbonizing and pyrolyzing, were investigated as a series of more than 240 bench scale tests. More than 30 pilot plant test runs were performed as materials balance operations using the carbonizing process. Five different Ohio coals having 2 to 4 percent sulfur were tested in the scope of the bench scale work and three of these were extensively tested in the pilot plant phase of activity. Favorable processing techniques have been developed for production of Helifuel. A practical flowsheet which uses well-developed metallurgical equipment was applied and the process appeared to be environmentally acceptable. Extensive sulfur fixation during processing was evident wherein the pilot plant tests showed that emissions of less than 0.6 lb. S/MMBtu were attainable in the exhaust gas streams. Low emissions of NO/sub x/ and particulates were also noted. Small scale combustion and gasification tests indicated clean pellet fuel to have satisfactory properties with respect to utilization and environmental control. The capability of having gaseous products of combustion free of visible emissions containing less than 0.6 lbs. S/MMBtu was demonstrated. The data from this program serve as satisfactory bases of (1) commercial product evaluation tests and (2) commercial or semicommercial (demonstration) plant design.

• Research Organization: McDowell Wellman Engineering Co., Cleveland, OH (USA)
• OSTI ID: 6831051
• Report Number(s): NP-4901789; ON: TI84901789
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
COAL
COMBUSTION
GASIFICATION
PELLETIZING
PYROLYSIS
LIMESTONE
ADDITIVES
BENCH-SCALE EXPERIMENTS
CARBONIZATION
EXPERIMENTAL DATA
FLOWSHEETS
GRINDING
MIXING
PILOT PLANTS
SULFUR CONTENT
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHEMICAL REACTIONS
COMMINUTION
DATA
DECOMPOSITION
DIAGRAMS
ENERGY SOURCES
FABRICATION
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
INFORMATION
MACHINING
MATERIALS
MOLDING
NUMERICAL DATA
OXIDATION
ROCKS
SEDIMENTARY ROCKS
THERMOCHEMICAL PROCESSES
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage
014000 - Coal
Lignite
& Peat- Combustion
010404 - Coal
Lignite
& Peat- Gasification
010406 - Coal & Coal Products- Pyrolysis & Cracking- (-1987)