887.    FEHLING, H. R.  Adiabatic Temperature and Equilibrium of the Gasification Process.  Jour. Inst. Fuel, vol. 14, 1940, pp. 39-46; Chem. Abs., vol. 35, 1941, p. 3415.

      Ideal gasification, wherein the reaction products are in thermodynamic equilibrium and no heat is lost, is illustrated by a diagram showing the interdependence of temperature, calorific value, steam saturation, and steam decomposition.  It also shows the theoretical limits of the process.  Analysis of experimental results with this diagram indicates that with low steam saturation nearly complete decomposition of CO2 and H2O is attainable.  At saturation temperatures above 45° the reaction velocity sets a limit and prevents complete decomposition when the temperature falls below a critical point that depends chiefly on reactivity.  Thermodynamic efficiency, as opposed to thermal efficiency, is defined as the degree of approach to the theoretical limit of a producer.  Experimental results show that gas quality and thermal efficiency may be improved only by increasing the amount of steam in conjunction with more reactive fuels, preheating the air and steam, and providing special aerodynamic conditions.  The so-called “wall effect” observed in producer practice is explained thermodynamically.

      FEISST, W.  See abs. 1042, 2874.

      FELDMAN, J.  See abs. 42a.