94.     ----------------. [ATWELL, H. V.] Gumz Powdered-Coal Gasification Process.  FIAT Final Rept. 1304, 1947, 53 pp.; PB 85,163.

                Cooperative experimental work on powdered-coal gasification was conducted by Demag, Bergbau, Verein, and Ruhrgas during 1940-43.  The design of the plant was based largely on theoretical considerations developed by Dr. W. Gumz.  The plant comprised 2 vertical reaction chambers, each having an inside diameter of 1.2 m. and a height of approximately 14 m.  The mixture of powdered coal and gasifying agent was passed upward through the 1^st chamber and down through the 2d.  Most runs were made with air-stream mixtures as the gasifying agent.  A few runs were made with air enriched with O₂ but none with air replaced by O₂.  Only moderate preheating of the gasifying agent was used, maximum 600°, and conversion of C was relatively incomplete in all runs.  A single unit with minor modifications was used throughout the program, and trouble always was experienced owing to accumulation of slag in the first reactor.  The process was not regarded as ready for commercial use.