Gasification of HYDRANE char in reactions with carbon dioxide and steam. [17 refs]

Conference · Wed Jan 01 04:00:00 EST 1975 · Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States)

OSTI ID:7155017

Fuchs, W; Yavorsky, P M

Hydrogasification of coal requires coal and hydrogen as raw materials. It has been proposed that the residual char of the process could be used to produce the needed hydrogen. In the HYDRANE process, the residual char still contains 50 percent of the carbon which was present in the original coal. Tests have been made on the HYDRANE char to obtain kinetic information concerning the water gas reactions. It has been proposed that the limiting step in this gasification reaction is the rate of carbon transfer from the solid state to the gaseous state in the form of carbon monoxide. In this case, steam-char reactions should yield the same gasification rate constant as carbon dioxide-char reactions. This has been confirmed within the accuracy of the experimental procedures. At pressures between 18 and 34 atm. and at temperatures between 700 and 900/sup 0/C, the rate constant for carbon gasification can be represented by an Arrhenius expression R = A exp (-E/RT) with an activation energy of E = (56 +- 3) kcal/mol, and with a frequency factor of A approximately equal to 2 x 10/sup 7/s/sup -1/. The activation energy is in good agreement with the results of previous work done on different char and coal materials. The frequency factor compares with values from published literature within an order of magnitude. A dependence of the reaction rate on the partial pressure of the reactant has not been observed if the reaction products were removed rapidly; this agrees with previous work. Results from an experimental gasification unit using the water gas reaction (SYNTHANE) have been found to agree reasonably well with these data.

• Research Organization: Pittsburgh Energy Research Center
• OSTI ID: 7155017
• Conference Information: Journal Name: Am. Chem. Soc., Div. Fuel Chem., Prepr.; (United States) Journal Volume: 20:3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
ACTIVATION ENERGY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHARS
CHEMICAL REACTION KINETICS
COAL
COAL GASIFICATION
CRYOGENIC FLUIDS
ELEMENTS
ENERGY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
GASIFICATION
HYDRANE PROCESS
HYDROGEN
KINETICS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
SNG PROCESSES