3278.     STIEF, F.  [Generation of Water Gas and Synthesis Gas From Brown Coal, Peat, and Bituminous Coal in the Pintsch-Hillebrand Plant at the Hamburg Gas Works.]  Gas- u. Wasserfach, vol. 83, 1940, pp. 1-6; Chem. Abs., vol. 34, 1940, p. 2569.

        Present German endeavors are to increase the quantity of gas by diluting coal gas with water gas.  The cheapest source of this gas is the Pintsch-Hillebrand continuous water-gas generator using brown coal.  Improvements were made in this generator so that it has been possible to operate continuously and shut down the regular (coke) water-gas plant.  One advantage of this process is the reduced content of organic S and H₂S in the gas, owing tot he reforming of the carbonization products by passage through the generator fuel bed.  The most important change has been to use producer gas for heating the regenerators, with the burners at the top of the regenerators.  The length of time that the regenerators are used for heating the circulating gas also has been increased.  Tar yields are about 2/3 of that indicated by the Fischer retort test.  The best fuel is brown coal, preferably in briquet form.  This could should not have to high an ash content or too low an ash melting point, and the ash should not react with the refractories.  Good results also were secured with peat.  Bituminous coal (high volatile) also was tested, but its low reactivity did not permit complete gasification.  If certain changes in construction were made, it should be possible to use this coal but it would be necessary to use the resultant high-ash coke in gas producers.