摘要:
The invention provides a practical and efficient method and apparatus for thermally processing organic based raw materials of either primary or secondary (recycled) origin, in order to extract volatile organic vapors and to selectively produce either condensable hydrocarbon gases or, more preferably, non-condensable synthesis gases that are rich in hydrogen and carbon monoxide for use as a raw material in chemical processes, or as a fuel. In particular, the invention provides a single rotary reactor having two contiguous hearth reaction areas, i.e., a drying and volatizing area and a reformation area, the areas being separated from each other by a bed-retaining refractory weir. The weir has an aperture for fluidly connecting the two hearth reaction areas of the single reactor. In each of the two reaction areas, the temperature, pressure, and chemical characteristics of the internal gaseous atmosphere can be selectively controlled to achieve the degree of volatizing, cracking, dissociation and/or reforming of vaporous hydrocarbon gases required to meet the desired operating objective. Thus, a variety of synthesis gases having differing degrees of richness in hydrogen and carbon monoxide may be produced in a single reactor, eliminating the need for a downstream secondary reformation or "finishing" reactor.
摘要:
A burner for an entrained bed gasifier is provided in which a stable ignition is accelerated in the vicinity of a fuel jetting port and a good combustion state is maintained. A fuel (1, 3), such as coal and char etc., and a portion of a gasifying agent (2, 4, 5) are premixed in a burner before they a charged into a gasifier. The burner includes a triple tubular member including an outer tubular portion, an intermediate tubular portion, and an inner tubular portion. A seal gas tube is positioned within the inner tubular portion. At the time when the fuel, such as coal and char etc., and a premixing gas (a portion of the gasifying agent) are charged into the burner, at least any one of the fuel, such as coal and char etc., and the premixing gas is charged in a tangential direction relative to the burner central axis so as to be given a swirling directional velocity component.
摘要:
Apparatus and method for gasification of feedstock materials are disclosed. The apparatus includes an oblate spheroid (egg-shaped) gasification chamber having inlets for feedstock material and gaseous oxidizer. A combustion gas outlet permits removal of combustion gases, and an ash collection region allows collection and removal of ash produced in the gasification chamber. A plurality of recirculating venturi tubes located within the gasification chamber recirculate combustion gases and particulates into and out of a gasification zone. Each venturi tube includes a plenum having a gaseous oxidizer inlet and a plurality of orifices capable of producing high velocity air flow towards the feedstock material bed in the gasification zone. Filtration action of the bed entrains combustion particulates. A plurality of air cannons coupled to one or more pulse valves provide pulsed air flow into the gasification zone to agitate the feedstock material bed. Gaseous oxidizer inlets in the ash collection region allow control of the ash carbon content. Advantageously, the gasification device does not have moving internal parts. The agitation and recirculation is controlled by the gaseous oxidizer pulses and input into the gasification chamber.
摘要:
A combustion apparatus in which combustible matter, e.g., waste matter, coal, etc., is gasified to produce a combustible gas containing a sufficiently large amount of combustible component to melt ash by its own heat. A fluidized-bed furnace has an approximately circular horizontal cross-sectional configuration. A moving bed, in which a fluidized medium settles and diffuses, is formed in the central portion of the furnace, and a fluidized bed, in which the fluidized medium is actively fluidized, is formed in a peripheral portion in the furnace. The fluidized medium is turned over to the upper part of the moving bed from the upper part of the fluidized bed, thus circulating through the two beds. Combustible matter is cast into the upper part of the moving bed and gasified to form a combustible gas while circulating, together with the fluidized medium. The amount of oxygen supplied to the fluidized-bed furnace is set so as to be not higher than 30% of the theoretical amount of oxygen necessary to combust the combustible matter. The temperature of the fluidized bed is maintained at 450.degree. C. to 650.degree. C. so that the combustible gas produced contains a large amount of combustible component.
摘要:
A gasification system for solid wastes having a thermal reactor and a mechanical gas cleaner, an indirect heat exchange cooler, and an electrostatic precipitator for cleaning and cooling the produced gas. Feed material is continuously fed to he central section of the thermal reactor above an air introduction manifold and nozzles and in an upward direction, forming a stratified charge. As feed material moves upward and outward from the reactor center it is reduced to ash. An agitator assures contact between the hot particulate product and hot gases resulting in gasification of the feed material and net movement to the sidewall of the thermal reactor, forming ash. The air introduction nozzles serve as a grate. Ash descends along the sidewall to the reactor base for removal. The mechanical cleaner has a high speed rotating brush-like gas separator element and scraper combination which removes condensed tars and particulates from the produced gas stream. The device is self cleaning in that condensed tars and particulates agglomerate on the high speed rotating bristle elements and, upon reaching adequate size and mass, are thrown off by centrifugal force to the cylindrical sidewall, where scrapers remove accumulated material which falls to the separator base for removal. An electrostatic precipitator having a cylindrical brush-like electrode suspended from one end by an insulated arm, removes remaining particles or aerosols from the product gas.
摘要:
A slag tap system for a pressurized gasifier system that includes a reaction vessel and a pressure vessel in surrounding relation to the reaction vessel. The slag tap system includes a slag tap portion through which slag is discharged from the reaction vessel, mounting means for mounting the slag tap portion in supported relation within the reaction vessel, water inlet means operatively connected to the slag tap portion for introducing water thereinto, water outlet means operatively connected to the slag tap portion for discharging water therefrom after the passage of the water through the slag tap portion, a slag tank mounted in supported relation within the pressure vessel below and in spaced relation to the slag tap portion and operative to receive the slag for quenching therewithin after the slag has been discharged from the slag tap portion, and discharge means operatively connected to the slag tank for effecting the discharge therefrom of the slag after the slag has undergone quenching within the slag tank.
摘要:
The process and apparatus for transforming combustible pollutants and waste materials into non-polluting, clean and useful energy, by completely removing the pollutants from raw materials while avoiding the formation of potential pollutants, involve the use of oxygen or a gas mixture containing oxygen, such as air, and steam.
摘要:
A burner for the production of synthesis gas by partial oxidation of carbon-containing fuels, which burner contains three or more concentrically arranged tubes and a cooling chamber. The downstream face of the cooling chamber is clad with a layer composed of individual, adjacently arranged, ceramic platelets.
摘要:
A two-fluid nozzle for atomizing a liquid with a gas in which at least two conduits, a central and annular conduit, converge in an internal mixing zone for the liquid and gas, in which the nozzle has a central discharge orifice having a shoulder at its upstream end, and a two-piece, thermally resistant metal alloy heat shield for the central discharge orifice which the heat shield includes a retaining ring and an outwardly flaring liner for the outlet connected so that the retaining ring bears against the central outlet shoulder and is held in place by the flared construction at its downstream end, preferably the liner has heat conductive flexible packing disposed between its outside surface and the discharge orifice. The central discharge orifice may open into a protective cap which is cylindrical at one end and rounds out to an elliptical end surface.
摘要:
Gasifier for combusting a particulated carbonaceous fuel by injecting a stream of the fuel into the gasifier combustion chamber together with a combustion supporting gas. The fuel mixture is burned to produce a usable gas and a particulated residual, both of which are directed into a liquid holding quench chamber. A constricted, frusto-conical throat which conducts the usable gas and particulated residual includes one or more nozzles that open into the throat and serve to direct pressurized jets of a scouring fluid into contact with residual particles which have become deposited on the throat wall, to displace the latter and thereby keep the throat void of such deposits.