Pressurized downdraft gasifier

Gas: heating and illuminating – Generators – Cupola

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Details

48 68, 48 852, 48111, 110229, 165 94, 165 95, C10J 320, C10J 332, C10J 342

Patent

active

046593403

ABSTRACT:
A pressurized downdraft gasifier for extracting high quality burning gases from fuels with low rates of gasification. The downdraft air with the gas products is made to take a tranverse path through a cylindrical bar grate depending into the ash collecting chamber from a throated bottom structure of the gasifying chamber and into annular space surrounding the grate at the top of the ash chamber from which space the gas products are delivered to gas burners and turbines to be utilized. Grate clearing assemblies are supported by their three blades respectively overlying respective grate bars and have a loose splined drive connection with a vertical drive shaft to allow the assemblies to tilt or rock while adjusting to clinkers plugging the grate bars. In the bottom of the ash chamber is a hearth plate with a central opening and a rejection plate also similarly loosely connected to the same vertical drive shaft to adjust to clinkers when sweeping the ash into the central opening of the hearth plate. A hollow inner drive shaft extends upwardly through the outer drive shaft, that drives grate clearing and hearth sweeping assemblies, to deliver cooling air to the shafts and to a rotary leveler mounted on its upper end that levels the fresh fuel being admitted to the gasifying chamber and at the same time supplies further air pressure to the gasifying chamber from the leveler. Level controllers are respectively provided in the respective gasifying and ash-receiving chambers and operable in response to the level of their contents to supply fuel to the gasifying chamber and to discharge the ash from the ash chambers.

REFERENCES:
patent: 1375210 (1921-04-01), Clayton et al.
patent: 2381200 (1945-08-01), Blake
patent: 2689786 (1954-09-01), Hubmann
patent: 3847562 (1974-11-01), Hamilton
patent: 3881885 (1975-05-01), Wagner
patent: 4014664 (1977-03-01), Kupfer et al.
patent: 4279295 (1981-07-01), Duckworth
patent: 4344772 (1982-08-01), Pillard
Solar Energy Research Institute, "Low-BTU Gasification: An Introduction", Oct. 1980, SERI/SP-733-832, pp. 1-12.

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