Two-dimensional pyrolysis effects during in-situ coal gasification: preliminary results

Journal Article · Tue May 01 04:00:00 EDT 1979 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/6150-PA· OSTI ID:6515959

Forrester, III, R C; Westmoreland, P R

Studies of two-dimensional pyrolysis systems consisted of experiments using large, instrumented blocks of subbituminous coal taken from the Roland-Smith seams near Gillette, WY. Apparatus and procedure are included. Typical thermal profiles produced in the blocks during these experiments show several interesting phenomena. Internal temperature gradients are small at 0.3/sup 0/C/min, but form a step thermal wave at 3/sup 0/C/min. Anisotropic effects are not seen. Heat transport within the wet coal during early stages of pyrolysis is rapid until the boiling point of water is reached. At that point, heat transfer into the wet, shrinking core is restricted by the vaporization of water. The amount of gas produced increases with temperature at the expense of char and liquid hydrocarbons. Above 600/sup 0/C, a higher heating rate increased the yield of H/sub 2/ and CO while it decreases the char yield. Char samples were recovered using techniques that avoid contact with air. Heating valves were found to range from 28 400 to 30 500 kJ/kg. Surface area and porosity measurements and the reactivity of selected samples with steam were reported. Condensable products from block pyrolysis include water and organic liquids (oil and tar). Yield at organic liquids decreases with higher block heating rate and T/sub max/. Gas evolution in experiments conducted at 0.3/sup 0/C/min. described the three classic regions of gas production from powder pyrolysis: (1) loss of adsorbed or loosely-bound volatiles; (2) a primary pyrolysis stage; and (3) a secondary pyrolysis stage. 1 figure. (DP)

• Research Organization: Oak Ridge National Lab., TN
• OSTI ID: 6515959
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States); ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
CARBONACEOUS MATERIALS
CHARS
CHEMICAL REACTIONS
COAL
COAL GASIFICATION
DECOMPOSITION
ENERGY SOURCES
EQUIPMENT
FOSSIL FUELS
FUELS
GASIFICATION
HYDROCARBONS
IN-SITU GASIFICATION
IN-SITU PROCESSING
MATERIALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
PROCESSING
PYROLYSIS
PYROLYSIS PRODUCTS
TAR
THERMOCHEMICAL PROCESSES