Reactivity of heat treated coals in steam

Technical Report · Sun Apr 01 04:00:00 EST 1979

DOI:https://doi.org/10.2172/5784037· OSTI ID:5784037

Linares-Solano, A.; Mahajan, O. P.

Reactivities of seventeen 40 x 100 mesh US coals charred to 1000/sup 0/C have been measured at 910/sup 0/C in 0.1 MPa of a N/sub 2/-H/sub 2/O mixture containing water vapor at a partial pressure of 2.27 kPa. Char reactivity decreases, in general, with increasing rank of the parent coal. The chars show a 250-fold difference in their reactivities. Results suggest that gasification of chars in air, CO/sub 2/ and steam involves essentially the same mechanism and that relative gasification rates are controlled by the same intermediate oxygen-transfer step. Removal of inorganic matter from raw coals prior to their charring or from chars produced from raw coals decreases the reactivities of lower rank chars whereas reactivities of higher rank chars increase. Addition of H/sub 2/ to steam has a marked retarding effect on char reactivity in most cases. However, in a few cases H/sub 2/ acts as an accelerator for gasification. The effect of particle size, reaction temperature and water vapor pressure on char reactivity is considered.

• Research Organization: Pennsylvania State Univ., University Park (USA). Coal Research Section
• Sponsoring Organization: USDOE
• OSTI ID: 5784037
• Report Number(s): FE-2030-TR14
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CARBONACEOUS MATERIALS
CATALYTIC EFFECTS
CHARS
CHEMICAL REACTION KINETICS
COAL
COAL GASIFICATION
COAL RANK
COMPARATIVE EVALUATIONS
DATA
DATA FORMS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
GASIFICATION
GRAPHS
INFORMATION
KINETICS
MINERALS
NUMERICAL DATA
PARTICLE SIZE
PRESSURE DEPENDENCE
PYROLYSIS PRODUCTS
REACTION KINETICS
SIZE
STEAM
TABLES
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES