Reactivities of heat-treated coals in steam

Conference · Sat Jan 01 04:00:00 EST 1977 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:6873532

Linares, A; Mahajan, O P; Walker, Jr, P L

We have previously reported reactivities of various American coal chars in air, CO/sub 2/, and H/sub 2/. In this paper, we are presenting reactivities of the same set of chars in steam. Reactivities have been measured at 910/sup 0/C in one atmosphere of N/sub 2/--H/sub 2/O mixture containing water vapor at a partial pressure of 17.5 torr. The variables chosen for investigation were rank of parent coals, mineral matter content, particle size, reaction temperature and pressure. Effect of addition of H/sub 2/ to steam on char reactivity has also been studied. Reactivity parameters for various chars along with relevant analyses of coals and chars are listed. It is seen that char reactivity decreases, in general, with increase in rank of the parent coal. There is a considerable spread in reactivities of chars produced from coals of different rank. Removal of mineral matter decreases, in general, subsequent char reactivity. However, in the case of chars derived from higher rank coals mineral matter removal enhances reactivity. Removal of mineral matter from coals prior to their carbonization brings about profound changes in surface area and porosity. The decrease in char reactivity and changes in surface area are much less pronounced when the chars rather than the coal precursors are demineralized.

• Research Organization: Pennsylvania State Univ., University Park
• OSTI ID: 6873532
• Report Number(s): CONF-770301-P2
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 22:1
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
COAL RANK
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASIFICATION
HEAT TREATMENTS
KINETICS
MINERALS
PYROLYSIS PRODUCTS
REACTION KINETICS
STEAM
THERMOCHEMICAL PROCESSES