Experimental and Process Design Study of a Fast Pyrolytic Gasification Process. Quarterly Technical Report No. 6,July--September 1975.

摘要

Six tests of the gasifier were made after a cooling coil was installed to protect the wall of the combustion chamber from being overheated. Tests with water flowing through the coil resulted in excessive cooling. The cold gas efficiencies were low (45to 62percent) and,at low coal feed rates,the gasification reactions were retarded so much that stable operation of the gasifier could not be achieved. Subsequent tests with air flowing through the coil as the coolant resulted in somewhat better operation,but the efficiency was still very much less than with noncooled walls. Three additional tests were made with uncooled walls to determine to what extent the use of a somewhat more coarsely ground coal had contributed to the low efficiency observed in the cooled-wall tests. These tests indicated that the differences in coal size did not contribute a significant effect on the conversion efficiency. The data obtained to date have been analyzed and correlations made of the fuel gas yield with oxygen/carbon feed ratio and combustion stage space time. The yield is very sensitive to variations in the feed ratio,but variations in the space time between 50and 290milliseconds results in no significant effect on the yield. Correlations have also been made indicating the approach to equilibrium of the steam-carbon,the CO sub 2 -carbon,and the water gas shift reactions. The shift reaction was found to be very near equilibrium,but the other two reactions were far from equilibrium. (ERA citation 01:022463)