Pressurized downdraft gasifier

US4659340A · kind A · utility

Inventor

• Lloyd E. Weaver · Bath, US

Key dates

• Filing date: Jun 24, 1985
• Grant date: Apr 21, 1987
• Expiry date: Jun 24, 2005

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10J2300/0956
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

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 l…