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Rotating bed gasifierRelated Patent Categories: Gas: Heating And Illuminating, Generators, Cupola, CoalRotating bed gasifier description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070169411, Rotating bed gasifier. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates generally to an apparatus for providing a more effective and efficient gasifier apparatus. More particularly, although not exclusively, the present invention relates to a rotating bed gasifier apparatus. [0002] Currently, there are many types of gasifier systems. Typically the gasification process is the primary energy generation means. Gasification generally takes materials, such as wood, coal, charcoal, agricultural residues, energy crops, municipal solid waste or other biomass materials, and gasifies them to make a "gas" used for power or electricity generation or other uses, such as heat production. A typical gasification system consists of a gasifier unit, a filtering system, and an energy converter. [0003] Steam boiler/combustor units are also well-known, though their use for primary energy generation has been questionable for some time, mainly because of the harmful resultant emissions. A steam boiler/combustor creates high pressure steam used for power generation. Prior art systems apply steam boiler/combustor units as secondary energy generation means to gain energy and thus increase efficiency and reduce pollutants such as gasses produced during the gasification process. An example of this type of system can be found in U.S. Pat. No. 6,637,206 to Thiessen, which is herein incorporated by reference in its entirety. [0004] One problem with fixed bed gasifiers is that there are inherent "hot spots" in the fuel, causing uneven gasifying. Some of these systems add moving fingers to the fixed bed to agitate the fuel to aid in the gasification process. The torque force on the fingers increases as the diameter of the fire tube holding the fuel increases. This limits the size of the gasifier which can be constructed. By creating too large a gasifier, these fingers or the shaft holding them bend and break during the agitation. [0005] U.S. Pat. No. 2,226,927 to Rundstrom is an up-draft gasifier which uses a grate system which reciprocates vertically, up and down, within a fixed bed core to maintain an even flow of fuel and gas and allow for the removal of ash. A problem with these vertically reciprocating beds and fixed bed gasifiers is that the larger the gasifier, the more chance for uneven heating inside the gasifier and thus poor gasifying of the fuel. [0006] Thus, in view of the foregoing, it is desirable to have an improved gasifying system that solves these and other problems of the prior art. [0007] Therefore, the primary feature or advantage of the present invention is an improved gasifier. [0008] Another feature or advantage of the present invention is the provision of a gasifier which reduces the size limitations in which a gasifier fuel mixer can be built. [0009] Another feature or advantage of the present invention is the provision of a gasifier that more uniformly heats the material being gasified to improve efficiency. [0010] Another feature or advantage of the present invention is the provision of a gasifier that improves air flow to the fuel. [0011] Another feature or advantage of the present invention is the provision of a gasifier that preferably includes a rotating bed, is economical to manufacture, durable in use and efficient in operation. [0012] These and the other features or advantages of the present invention will be apparent from the specification and claims that follow. BRIEF SUMMARY OF THE INVENTION [0013] One or more of the foregoing features or advantages may be achieved by a gasifier having a container with a top, sidewalls, and a bottom for facilitating the gasifying process. An open vertical shaft extends down from the top of the container and allows a downdraft or updraft of air to mix with fuel for the gasifying process. A rotating bed inside the container preferably located below the shaft receives the fuel; the bed rotates essentially perpendicular to the shaft. [0014] A further aspect of the present invention involves one or more fingers extending from a lower portion of the shaft for mixing the fuel with the air. The present invention may also include one or more fingers which extend upward from the rotating bed for mixing the fuel with the air. The present invention also preferably includes a shaft attached to the bed for rotating the bed. [0015] Another aspect of the present invention is an ash auger for removing used fuel from the container. Yet another aspect of the present invention is the provision of a gasifier which recycles the used fuel back into the shaft for reusing the fuel. Another provision of the present invention is a gasifier having a bed with sidewalls extending upward to hold the fuel onto the bed. [0016] One or more of the foregoing features or advantages may be achieved by the gasifier having a container with a top, sidewalls, and a bottom for facilitating the gasifying process, a first open vertical shaft extending inside the container, a second open vertical shaft inside the first vertical shaft creating a space between the first and second shafts for allowing a downdraft of air and fuel for the gasifying process in the space between the first and second shafts, and a rotating bed inside the container, below the space between the first and second shafts for receiving the fuel, the bed rotating essentially perpendicular to the shafts. BRIEF DESCRIPTION OF THE DRAWINGS [0017] FIG. 1 shows one embodiment of a gasifier system assembly for using a gasifier to create energy. [0018] FIG. 2 shows a cut away view of one embodiment of a downdraft rotating bed gasifier. [0019] FIG. 2A shows the gasifier of FIG. 2 configured as an updraft gasifier. [0020] FIG. 3 shows a top view of one embodiment of the vertical shaft shown in FIG. 2. [0021] FIG. 4 shows a top view of one embodiment of the rotating trough or bed shown in FIG. 2. Continue reading about Rotating bed gasifier... Full patent description for Rotating bed gasifier Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Rotating bed gasifier patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. 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