Processes Patents (Class 406/197)
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Patent number: 4936870Abstract: The process for determining and controlling the fuel mass flow in partial oxidation and gasification of a fine-grained to powdery fuel includes particularly drawing the fuel from the supply vessel through a single outlet pipe and feeding the fuel to a distributor, in which a plurality of individual supply lines are connected to the individual burners, the fuel mass flow rate in the supply lines depending on the speed measured there and the radiometric density measurement being determined in the outlet pipe of the supply vessel. For control of the fuel mass flow a stepwise regulation depending on the crude gas flow produced in the gasification unit is thus provided.Type: GrantFiled: July 13, 1989Date of Patent: June 26, 1990Assignee: Krupp Koppers GmbHInventors: Hans R. Baumann, Adolf Linke, Eberhard Kuske, Hans-Reiner Schweimanns
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Patent number: 4932594Abstract: An apparatus for supplying a controlled flow of pneumatically transported solid particles, in particular, pulverized coal, comprises a pulverizer or vessel for containing pneumatically suspended solid particles. A supply pipe is connected to the pulverizer or vessel for removing a mixture of pneumatic gas and solid particles from the vessel. A bend is provided in the supply pipe and an aspirator is connected to the supply pipe at a distance of from one to two pipe diameters from the bend. The aspirator is provided on the outer wall of the bend and is supplied with aspirating gas to draw off an amount of mixture from the supply pipe. This controls the amount of remaining flow of mixture through the pipe. The supply of the aspirator is connected to a bypass line which is connected to the mixture inlet of an injector which is supplied with injecting gas. The supply of the injector which carries the mixture is connected back into the vessel.Type: GrantFiled: May 24, 1988Date of Patent: June 12, 1990Assignee: The Babcock & Wilcox CompanyInventor: Raymond K. Kim
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Patent number: 4904128Abstract: An improved and the related system for pneumatically transporting a powder or granular material placed in an airtight storage container through a transport pipe in high density. The material is formed into a long column in a horizontal upper pipe of the transport pipe and is transported at very slow speed and in high density by being performed such operation that the material is first increased and then reduced in speed and again accelerated while being moved up through a vertical riser pipe connected to the horizontal pipe and is once more reduced in speed when the material enters the horizontal upper pipe.Type: GrantFiled: October 20, 1987Date of Patent: February 27, 1990Assignees: Kyowa Hakko Kogyo Co., Ltd., Kabushiki Kaisha Matsui SeisakushoInventors: Kiyoshi Morimoto, Akikazu Iwamoto, Masuo Moriyama, Atsuroh Sonoda
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Patent number: 4877419Abstract: An apparatus and method for stripping and depressurizing fine particulates mixed with gas discharged from a vessel operated at elevated temperature and pressure conditions to a low pressure vessel using a purge gas injected into a conduit designed for significant frictional pressure loss per unit length of conduit while maintaining a substantially constant velocity of the mixture conveyed.Type: GrantFiled: September 18, 1987Date of Patent: October 31, 1989Assignee: Shell Oil CompanyInventor: Thomas S. Dewitz
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Patent number: 4871284Abstract: Large or small articles are hydraulically transported through a pipeline with the help of fibers that flocculate in the hydraulic liquid to form flocs and networks of flocs which cushion the articles against engagement with the wall of the pipeline pipe. The articles can be packed in capsules and the capsules provided with vanes to improve cushioning. Cushioning can also be improved by introducing stranded lattices into the fiber-floc-containing liquid to thus increase the flocculating action.Type: GrantFiled: October 13, 1987Date of Patent: October 3, 1989Assignee: Fibre Dynamics LimitedInventor: Geoffrey G. Duffy
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Patent number: 4863317Abstract: Method and apparatus for transporting particulate material through a pipeline. The particles have a size distribution which provides a solids density of at least 85%. The particular have a maximum size of 20% of the bore.Type: GrantFiled: July 2, 1987Date of Patent: September 5, 1989Inventor: Bede A. Boyle
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Patent number: 4844663Abstract: The present invention is directed to an apparatus and method for minimizing mass flow rate fluctuations of a particulate solid fuel and gas mixture having a coal mass flow rate ranging from about 50-800 kg/m.sup.3 and a corresponding frequency range of about 0.1 to 100 Hertz transported to a reactor.Type: GrantFiled: September 18, 1987Date of Patent: July 4, 1989Assignee: Shell Oil CompanyInventors: James A. Salter, Thomas S. DeWitz, Hendricus A. Dirkse, Johannnes W. Van Der Meer
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Patent number: 4834588Abstract: The present invention is directed to an apparatus and method for minimizing mass flow rate fluctuations of a particulate solid fuel and gas mixture having a coal mass flow rate ranging from about 50-800 kg/m.sup.3 and a corresponding frequency range of about 0.1 to 100 Hertz transported to a reactor.Type: GrantFiled: September 18, 1987Date of Patent: May 30, 1989Assignee: Shell Oil CompanyInventors: James A. Salter, Thomas S. DeWitz, Hendricus A. Dirkse, Johannes W. van der Meer
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Patent number: 4830546Abstract: An improved method for slurrying bulk dry powder material within a hopper car is described. The method includes providing a static web of individual strands extending through the interior of the hopper compartment so that when water is admitted to the bottom of the hopper car, the water will travel upwardly along the strands of the web and through the dry bulk material to wet the same.Type: GrantFiled: December 30, 1987Date of Patent: May 16, 1989Assignee: J. M. Huber CorporationInventors: Michael C. Withiam, Alvin E. Steelman
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Patent number: 4830287Abstract: An apparatus for supplying a controlled flow of pneumatically transported solid particles, in particular, pulverized coal, comprises a pulverizer or vessel for containing pneumatically suspended solid particles. A supply pipe is connected to the pulverizer or vessel for removing a mixture of pneumatic gas and solid particles from the vessel. A bend is provided in the supply pipe and an aspirator is connected to the supply pipe at a distance of from one to two pipe diameters from the bend. The aspirator is provided on the outer wall of the bend and is supplied with aspirating gas to draw off an amount of mixture from the supply pipe. This controls the amount of remaining flow of mixture through the pipe. The supply of the aspirator is connected to a bypass line which is connected to the mixture inlet of an injector which is supplied with injecting gas. The supply of the injector which carries the mixture is connected back into the vessel.Type: GrantFiled: October 6, 1987Date of Patent: May 16, 1989Assignee: The Babcock & Wilcox CompanyInventor: Raymond K. Kim
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Patent number: 4802796Abstract: A pressure-reducing device in a pneumatic transport system for particulate material having a first and a second transport channel which are arranged so that, at the transition between the two channels, the gas/particulate flow is bent through 180.degree.. After the bend, a throttling means is arranged. The throttling means consists of an annular nozzle, the inlet side thereof being rounded with an arcuate profile in radial section. The pressure-reducing device may be included in a transportation system for feeding particulate material out from a pressurized container to a container under a lower pressure, for example for removing dust from a dust separator in a PFBC plant to a collecting container.Type: GrantFiled: September 29, 1987Date of Patent: February 7, 1989Assignee: ASEA-Stal ABInventor: Roine Brannstrom
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Patent number: 4789272Abstract: Upon transportation of synthetic rubber chips through a piping or by means of a conveyor, 2 wt. %-50 wt. % based on the weight of the synthetic rubber chips of steam of 160.degree. C. or lower, water or both steam of 160.degree. C. or lower and water is added to the synthetic rubber chips upon their transportation.Type: GrantFiled: March 17, 1987Date of Patent: December 6, 1988Assignees: Mitsui Toatsu Chemicals, Incorporated, Toyo Engineering CorporationInventors: Tetsuyuki Matsubara, Norifumi Ito, Mune Iwamoto, Toshihiko Ando
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Patent number: 4765781Abstract: A slurry of liquified gas such as carbon dioxide and finely pulverized coal particles is provided in a mixing chamber and discharged from the chamber into a pipeline for conveyance to a power plant. During discharge from the mixing chamber pressurized gas at a sufficiently high pressure is injected above the slurry mix to maintain adequate pressure during discharge and prevent cavitation at the inlet port of a pump employed in the pipeline. The slurry is depressurized at the downstream end of the pipeline by movement through a pressure reducer so that it is decompressed non-adiabatically and the coal and gas particles are separated. The gas remains at a low temperature and is passed in heat exchange relationship with cooling water from the power plant cooling tower to lower the temperature of same and consequently increase the efficiency of the power plant.Type: GrantFiled: May 29, 1986Date of Patent: August 23, 1988Assignee: Southwestern Public Service CompanyInventors: David M. Wilks, Steven L. Mickna
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Patent number: 4749312Abstract: A granular product to be dosed is introduced at the same time as a transfer liquid into a dosing chamber below a retaining grid, provided in the upper part thereof. The measurement of the pressure upstream of the dosing chamber makes it possible to detect the arrival of the product level with the grid and to stop the introduction thereof. An inverted U-shaped pipe forming a syphon then ensures the transfer of the dosed product into a tank, when the compressed air is injected into the dosing chamber above the grid.Type: GrantFiled: April 9, 1987Date of Patent: June 7, 1988Assignee: Technicatome, Societe Technique pour l'Energie AtomiqueInventor: Jean Raibaud
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Patent number: 4738770Abstract: A process and apparatus of preventing the plugging of the discharge and/or suction line of an internal recycle pump utilized in an expanded bed reactor of the type having a partition transversely extending through the lower portion thereof and defining a plurality of substantially regularly and uniformly disposed perforations and communicating with a reaction zone above the partition and plenum chamber therebelow. The reaction zone contains a mass of particulate catalyst contact matter supported by the partition and placed in randon motion above the partition by a pressurized mixture of a liquid carbon containing material and a hydrogen rich gas flow passing through the perforations from the plenum chamber and by the internal recycle pump having a pump suction line generally concentrically disposed with respect to the reactor and extending through the partition into the reaction zone.Type: GrantFiled: November 25, 1985Date of Patent: April 19, 1988Assignee: Cities Service Oil and Gas Corp.Inventors: Kenneth E. Hastings, Harold J. Trimble
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Patent number: 4735731Abstract: Industrial liquids containing viscoelastic surfactant compositions can be reversibly thickened and broken. For example, a thickened industrial liquid can exhibit good solids carrying capacity, and after the viscosity of the liquid is broken, using techniques such as change in pH, addition of a hydrocarbon, change in temperature, etc., the solids can be easily removed therefrom. Viscosity can be again provided to the industrial liquid without the necessity of adding substantial amounts of additional thickener.Type: GrantFiled: April 14, 1986Date of Patent: April 5, 1988Assignee: The Dow Chemical CompanyInventors: Gene D. Rose, Arthur S. Teot, Peter A. Doty
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Patent number: 4721420Abstract: A method and composition are provided for transporting coarse particles of coal in a dense liquid CO.sub.2 media. The dense media contains fine particles of densifying material such as coal or magnetite which form a suspension in the liquid CO.sub.2. The suspension is capable of supporting large particles of coal for transportation in a liquid CO.sub.2 slurry pipeline. Use of the dense media allows the pumping of the coarse coal particles at slower velocities than if the fine densifying particles were not present.Type: GrantFiled: September 3, 1985Date of Patent: January 26, 1988Assignee: Arthur D. Little, Inc.Inventors: Chakra J. Santhanam, Richard W. Hanks, R. Peter Stickles
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Patent number: 4707162Abstract: A pumpable slurry of material particles in water comprises coarse mineral particles having a particle size in the range 5 to 50 mm and fine mineral particles having a size less than 200 micron. The slurry contains 82 to 85%, preferably 83-85%, by weight of mineral particles based on the combined weight of the mineral particles and water. At least 30% by weight of the mineral particles are in the form of coarse particles, 10 to 40% by weight are in the form of fine particles and the balance to 100% by weight are intermediate sized particles.The mineral particles are preferably coal.Slurries of this concentration have special properties in that they are sufficiently fluid to be pumped through a pipeline, yet sufficiently solid when static to be handled by grabs and similar devices.Type: GrantFiled: August 10, 1984Date of Patent: November 17, 1987Assignee: The British Petroleum Company p.l.c.Inventor: David A. Brookes
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Patent number: 4702182Abstract: A pneumatic mixture which has a relatively high content of pulverulent materials in the propulsion air is formed in a single metering means. This mixture is propelled through a common primary pipe to a distribution head in which the mixture is divided into secondary currents which are delivered respectively to each of the injection points. A supercritical speed is imparted to the mixture in the distribution head.Type: GrantFiled: August 5, 1986Date of Patent: October 27, 1987Assignee: Paul Wurth S.A.Inventors: Leon Ulveing, Joseph Linden, Matthias Bohnet, Georges Wies, Raymond Mack
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Patent number: 4692169Abstract: Carbonaceous slurries are provided in which the carbonaceous slurry stabilizer is selected from the group of(1) the alkyl ether of a polygalactomannan alone, or in combination with xanthan gum or(2) the hydroxyalkyl ether of a polygalactomannan in combination with xanthan gum, or(3) a mixture of said alkyl ether, said hydroxyalkyl ether and said xanthan gum.Type: GrantFiled: November 12, 1985Date of Patent: September 8, 1987Assignee: Henkel Corp.Inventors: Warren W. Howland, Robert E. Arquette, Shang-Ren Wu
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Patent number: 4689173Abstract: Slurries of pentaerythritol in a liquid oil in which pentaerythritol is substantially insoluble are disclosed. The slurries can contain up to 70 percent by weight or more of solid pentaerythritol. Suitable oils include propylene glycol, ethylene glycol, vegetable oils, glycerin and tall oil fatty acid. The slurries are stable and flowable allowing for shipment in bulk.Type: GrantFiled: June 10, 1986Date of Patent: August 25, 1987Assignee: International Minerals & Chemical CorporationInventor: Paul E. Eckler
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Patent number: 4688588Abstract: A method for facilitating the flow of material in fines. The fines are selected from silica based materials and coals; and the level of impurity in the fines and comprising metal oxide, carbonate and sulphides in the case of silica materials, and coal ash in the case of coals, is determined. A thick slurry of the fines in water is prepared, and a quantity of dispersant proportional to the determined level of impurity is added to the slurry to form a pumpable slurry.Type: GrantFiled: February 24, 1986Date of Patent: August 25, 1987Assignees: Royal Melbourne Institute of Technology Limited, Western Australian Institute of TechnologyInventors: Richard R. Horsley, Robert L. Jones, Robert J. Snow
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Patent number: 4685842Abstract: A method and apparatus for withdrawal and replacement of solid particles slurried in a fluid employing L-valves is disclosed. The flow through the L-valves is controlled by the control of the flow of separated fluid and the replacement and withdrawal functions are configured so as to permit removal of the solids from the system and addition of fresh material. Control of the fluid flow by means of exerting or controlling pressure on the gas phase in association with it.Type: GrantFiled: December 4, 1984Date of Patent: August 11, 1987Assignee: Chevron Research CompanyInventors: David S. Smith, Harold W. Kamins
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Patent number: 4685840Abstract: A method of transporting large diameter solids, such as coal having a diameter of greater than 1 inch, preferably eight to twelve inches, predicated on pipe diameter, in the form of a slurry through a pipeline is disclosed. The method comprises the step of placing large diameter solids in a vehicle and pumping it through a pipeline. The specific gravity of the vehicle is substantially equal to the specific gravity of the solids so that the coal remains in suspension over a wide range of pipeline velocities. A lubricant is added to the vehicle to reduce friction and enhance energy efficiency of the process. The coal is pumped from a pumping tank into which the solids and vehicle are introduced, the pumping tank, after filling, is pressurized with a fluid such as air or inert gas to propel the mixture through the pipeline. This pump and its valving allows large diameter solids to be pumped through the pipeline.Type: GrantFiled: August 2, 1985Date of Patent: August 11, 1987Inventor: Robert C. Wolff
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Patent number: 4666462Abstract: Control process for producing an aqueous slurry of solid carbonaceous fuel having a desired solids concentration for feed to a partial oxidation gas generator by grinding together in a size reduction zone a recycle aqueous slurry stream comprising carbon-containing particulate solids, a stream of solid carbonaceous fuel, and a specific amount of make-up water. No valves are in the line or path between the size reduction zone and the feed tanks for the solid carbonaceous fuel and recycle aqueous slurry. A system control unit automatically calculates the amount of make-up water and provides a corresponding signal to control the flow rate. Input signals that are provided to the system control unit include those corresponding to the weigh belt feeder speed and moisture content for the solid carbonaceous fuel; and pump speed, weight fraction, temperature, and density of the solids for the slurry of recycle particulate solids.Type: GrantFiled: May 30, 1986Date of Patent: May 19, 1987Assignee: Texaco Inc.Inventor: Michael C. Martin
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Patent number: 4645514Abstract: Coal-aqueous slurries having improved shear stability and lower viscosity are described. The use of a plurality surfactants each having hydrophilic portion with each surfactant hydrophilic portion having a different molecular weight are utilized in sufficient amounts to wet and disperse particulate coal and water. When two surfactants are utilized, coal-aqueous mixtures may be formulated having up to or over 70% by weight coal when the first surfactant has a hydrophilic portion comprising a relatively large number of ethylene oxide units and the second surfactant has hydrophilic portion comprising a relatively small number of ethylene oxide units.Type: GrantFiled: July 21, 1983Date of Patent: February 24, 1987Assignee: Oxce Fuel CompanyInventor: Robert H. Lane
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Patent number: 4634451Abstract: Aqueous carbonaceous mixtures such as water slurries of solid particulate carbonaceous materials having reduced viscosity, a stabilized network of carbonaceous materials in water and improved pumpability are obtained by using a condensation product of an aldehyde in aldehyde liberating composition, ketone and sulfur dioxide in a sulfur dioxide liberating composition as dispersant, the dispersant being present in an amount sufficient to reduce viscosity of the slurry, stabilize the network of carbonaceous materials in water and improve pumpability. An improved process for the condensation product is disclosed.Type: GrantFiled: May 10, 1985Date of Patent: January 6, 1987Assignee: Diamond Shamrock Chemicals CompanyInventors: Stanley A. Lipowski, Jose L. Villa, John J. Miskel, Jr., Reuben H. Grinstein
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Patent number: 4605329Abstract: A method and apparatus for hydraulically transporting objects, including particulate material such as coal, along a conduit. A supporting material such as a quantity of flexible fibres are mixed into a liquid and their tendency to flocculate therein is utilized to create a network which will support the objects in the liquid. The objects can be supported in the mix while it is pumped along a conduit, for example a pipe, to thus transport the objects. At the outlet a separation means removes the objects from the mix of liquid and supporting material.Type: GrantFiled: October 25, 1983Date of Patent: August 12, 1986Assignee: Fibre Dynamics LimitedInventor: Geoffrey G. Duffy
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Patent number: 4592679Abstract: In a process and apparatus for pneumatically conveying loose material in grain or dust form by discharge thereof from a conveyor container, through a conveyor conduit disposed downstream thereof, after the conveyor container has been emptied and before the conveyor conduit is also emptied of the loose material being conveyed, the conveyor conduit is closed at both ends, to maintain that existing condition. After the conduit is thus closed off at both ends, leakage losses of conveying gas are compensated for by supplying a leakage make-up amount. The apparatus has a conveyor conduit which is provided at each of its end portion towards the conveyor conduit and its discharge end portion with at least one closure member to act as inlet and outlet valves respectively. At least one gas feed line from a leakage make-up valve opens into the conduit.Type: GrantFiled: March 9, 1983Date of Patent: June 3, 1986Assignee: Alb. Klein GmbH & Co. KGInventors: Hans H. Boiting, Bernd Federhen, Gerhard Muller-Spath
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Patent number: 4570552Abstract: A process and apparatus for delivering carbon i.e., coal dust, to be combusted in a furnace is presented. The furnace is of the type having plural combustion points and may include a shaft furnace such as, for example, a blast or cupola furnace. The carbon dust is delivered in dosed quantities to each of the individual combustion points in a separate air stream which is under a predetermined pressure. The carbon (coal dust)/carrier gas (air) is delivered to each combustion point in the furnace at super critical speed, i.e., the speed of sound, the carrier gas having a relatively high proportion of solid material therein. The actual quantity of carbon material delivered to each combustion point is directly detected and monitored as a consequence of volumetric measurement and is appropriately corrected by means of a secondary air supply when the carbon quantity either exceeds or falls below a predetermined nominal value.Type: GrantFiled: July 19, 1984Date of Patent: February 18, 1986Assignee: Paul Wurth S.A.Inventors: Hans-Gunther Rachner, Hans-Herrmann Boiting
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Patent number: 4564371Abstract: A dispersant for an aqueous coal slurry, comprising as an active ingredient a water-soluble salt of a polymeric substance having a sulfonic acid residue bonded through an acid imide linkage or an acid amide linkage in the molecule.Type: GrantFiled: January 23, 1985Date of Patent: January 14, 1986Assignee: Nippon Zeon Co LtdInventors: Tsunehisa Ueda, Tadao Natsuume
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Patent number: 4563196Abstract: In a coal-gasification reactor installation, carbon dioxide gas is added into a liquid coal suspension in the form of fine bubbles of gas to improve the flowability and dispersion of the liquid coal suspension. In a preferred embodiment, carbon dioxide is separated from the gaseous reactor products, dissolved in an ammonium solution, reacted to form solid ammonium carbonate salt; the solid chemical salt is added to the liquid coal suspension where it is made to decompose and generate carbon dioxide gas.Type: GrantFiled: March 19, 1984Date of Patent: January 7, 1986Assignee: Ruhrkohle AktiengesellschaftInventor: Jurgen Seipenbusch
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Patent number: 4552568Abstract: A method for preparing a coal-water slurry is described, comprising the divided addition of dispersing agent or multi-step addition of dispersing agent during grinding in a process for preparing a coal-water slurry by the wet grinding of coal in water.Type: GrantFiled: July 22, 1983Date of Patent: November 12, 1985Assignee: Nippon Oil and Fats Co., Ltd.Inventors: Taizo Igarashi, Hisao Higuchi, Shingo Yamazaki
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Patent number: 4551041Abstract: Method for unplugging a pipeline filled with fluid and solid material by blocking the pipeline below the plugged portion, injecting pressure pulses into the pipeline on both sides of the plugged portion until the plugged portion becomes fluidized and then forcing water into and through the plugged portion to remove the plug. The method further contemplates controlling the frequency and the phase of the injected pressure pulses to best match the length of the pipeline between the injected pulses so that the pulse applied to each side of the plug is out of phase.Type: GrantFiled: June 11, 1984Date of Patent: November 5, 1985Assignee: Conoco Inc.Inventors: Julian B. Coon, Eston F. Petry
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Patent number: 4548529Abstract: Coal powder is transported from a low pressure zone to an elevated pressure zone bypassing the powder from the low pressure zone to the top of the first one of a number of vertical vessels;passing the powder in each vessel by gravity as a moving bed from the top of the vessel to the bottom thereof;passing the powder from the bottom of each vessel but the last one to the top of the subsequent vessel by mechanical or pneumatic means;discharging the powder from the bottom of the last vessel to the elevated pressure zone.Type: GrantFiled: February 13, 1984Date of Patent: October 22, 1985Assignee: Shell Oil CompanyInventor: Maarten J. van der Burgt
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Patent number: 4546612Abstract: A process as disclosed forming a non-agueous, free-flowing composition. The process involves treating a finely divided inorganic or organic material with liquid carbon dioxide to form a slurry. The treated material is separated from the slurry and shows suprising free-flowing, nonagglomerated behavior.Type: GrantFiled: February 21, 1984Date of Patent: October 15, 1985Assignee: Arthur D. Little, Inc.Inventor: Chakra J. Santhanam
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Patent number: 4526584Abstract: A process for pumping a carbonaceous slurry which contains at least about 60 volume percent of solids is disclosed. The slurry used in this process has a carbonaceous consist with a particle size distribution in substantial accordance with a specified CPFT formula. The slurry is pumped in a substantially laminar regime, at a Reynolds number of less than about 2100.Type: GrantFiled: April 13, 1983Date of Patent: July 2, 1985Assignee: Alfred University Research Foundation, Inc.Inventor: James E. Funk
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Patent number: 4525173Abstract: A pumpable slurry of mineral particles, e.g., coal, in water contains 50 to 85% by weight of mineral particles based on the combined weight of mineral particles and water. The mineral component contains at least 30% by weight of coarse particles having a particle size in the range 5 to 50 mm, 10 to 40% by weight of fine particles having a particle size less than 200 micron and the balance to 100% of intermediate sized particles.The slurry is stable without the use of additives and can be pumped through a pipeline.Type: GrantFiled: May 17, 1983Date of Patent: June 25, 1985Assignee: The British Petroleum Company p.l.c.Inventors: Peter J. Baker, David A. Brookes, Martin Johnson
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Patent number: 4507022Abstract: Method and apparatus for transporting a slurry along a pipeline having a number of downstream delivery points along its length and a plant at each delivery point for burning or otherwise using a part of the solids, such as coal, obtained from the slurry. In the practice of the method, the pipeline is filled with a carrier fluid, such as water, and batches of slurry are introduced between batches of the carrier fluid for movement along the pipeline. Each batch of slurry is separated from the batches of carrier fluid by a cap and a tail, the cap and tail being formed from a liquid suspension of fine solids. At each downstream delivery point, each batch of slurry and its cap and tail are directed out of the pipeline into a holding tank. A portion of the contents of the holding tank is removed from the holding tank and dewatered to produce a large mesh solids cake and a centrate defined as a liquid suspension of fines.Type: GrantFiled: April 20, 1982Date of Patent: March 26, 1985Assignee: Bechtel International CorporationInventor: John C. Carney
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Patent number: 4505716Abstract: Combustible fuel slurry compositions and methods for producing such compositions. The compositions comprise mixtures of particulate coal, water, wetting/dispersing agents for the coal and suspending agents for stabilizing the slurries. The suspending agents include clays such as attapulgite, sepiolite, bentonite and montmorillonite. The wetting/dispersing agents include anionic and non-ionic surface active agents.Type: GrantFiled: February 15, 1984Date of Patent: March 19, 1985Assignee: ITT CorporationInventor: Edgar W. Sawyer, Jr.
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Patent number: 4502868Abstract: Coal-water slurries having high solids contents and improved pumpability containing a viscosity improving additive comprising a sulfonated product of humic acids.Type: GrantFiled: September 27, 1982Date of Patent: March 5, 1985Assignee: Texaco Inc.Inventors: Farrokh Yaghmaie, Ronald J. Mc Keon
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Patent number: 4501205Abstract: A process for burning a carbonaceous slurry is provided. In this process, a high-solids content carbonaceous slurry with a specified particle size distribution and specified other properties is provided. Thereafter, the slurry is atomized and burned.Type: GrantFiled: March 10, 1983Date of Patent: February 26, 1985Assignee: Alfred University Research Foundation, Inc.Inventor: James E. Funk
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Patent number: 4498906Abstract: Coal-water fuel slurries having long-term storage stability and improved viscosities and comprising finely-divided coal within efficient combustion size range, water, and minor amounts of alkali metal salts of organic dispersants and alkaline earth metal salts of organic dispersants, and process for making such slurries.Type: GrantFiled: April 16, 1982Date of Patent: February 12, 1985Assignee: Atlantic Research CorporationInventor: Robert S. Scheffee
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Patent number: 4496367Abstract: A pumpable aqueous slurry of a solid fuel in the form of a pulverized, carbonaceous material and a process for the production of such slurry are described. The aqueous slurry comprises a component which consists of coarse grains of carbonaceous material having a particle size of up to 25 mm, and a further component which consists of a carrier liquid in which the coarse-grained carbonaceous material is suspended. The carrier liquid proper has a solids content of 65-90% by weight and consists of water and pulverized, carbonaceous material having a particle size of at most 0.5 mm, preferably at most 350 .mu.m, and 0.02-2% by weight of at least one additive including a water-soluble surface active compound which consists of an alkylene oxide adduct having a hydrophobic part and a hydrophilic part, said hydrophilic part consisting of a polyalkylene oxide chain, preferably a polyethylene oxide chain, having a length of 40-200 alkylene oxide units.Type: GrantFiled: May 6, 1983Date of Patent: January 29, 1985Assignees: AB Carbogel, Berol Kemi ABInventors: Mait M. Mathiesen, Lars I. Gillberg, Karl M. E. Hellsten, Gunvor B. T. Karlsson
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Patent number: 4494959Abstract: A deashed coal-water slurry and process for preparing the same containing 65-85 percent of solids and 0.01-2.4 weight percent of dispersing agent. The slurry is comprised of a coal compact whose coal particles have a particle size distribution in substantial accordance with a specified formula. The coal-water slurry has a relatively low viscosity of less than 4,000 centipoise at a 75 percent solids content and, when it is pumped at either a constant or an increasing shear rate, its viscosity decreases. Also disclosed are a pumping process and an electrophoretic deashing cell and process.Type: GrantFiled: June 30, 1983Date of Patent: January 22, 1985Assignee: Alfred University Research Foundation, Inc.Inventor: James E. Funk
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Patent number: 4492589Abstract: Aqueous carbonaceous slurries having reduced viscosity, a stabilized network of carbonaceous material in water and improved pumpability are obtained by having present as a dispersant an alkali or ammonium bis-alkyl sulfosuccinate. An example is the sodium salt of bis-2-ethylhexyl sulfosuccinate.Type: GrantFiled: September 20, 1982Date of Patent: January 8, 1985Assignee: Diamond Shamrock Chemicals CompanyInventors: Martin J. Schick, Edwin L. Kelley
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Patent number: 4480560Abstract: A method for pneumatically conveying solvent refined coal to a burner under conditions of dilute phase pneumatic flow so as to prevent saltation of the solvent refined coal in the transport line by maintaining the transport fluid velocity above approximately 95 ft/sec.Type: GrantFiled: December 9, 1983Date of Patent: November 6, 1984Assignee: International Coal Refining CompanyInventor: Dennis R. Lennon
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Patent number: 4470727Abstract: Process and apparatus for preparing a substantially uniform, gas-containing cement slurry by directing two pressurized streams of a gas-containing hydraulic cement slurry to a common in-line focal point in a generally opposed fashion so that good mixing is achieved by the contact of the two streams. The process is particularly adapted for use in preparing "foamed" cement slurries for cementing subterranean voids such as well boreholes, groutholes, natural cavities and similar voids.Type: GrantFiled: April 15, 1982Date of Patent: September 11, 1984Assignee: The Dow Chemical CompanyInventor: James C. Ritter
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Patent number: 4468232Abstract: A process for providing a clean coal-water slurry, which contains from 60-80 volume percent of coal and has a relatively low viscosity, is provided. In one embodiment of this process, a coal-water mixture which contains 60-80 volume percent of solid material is ground until a slurry whose particle size distribution is in accordance with a specified CPFT formula is produced, and the coal is cleaned; in this embodiment, the coal is cleaned either by cleaning the coal-water mixture before grinding it, or by cleaning the coal-water slurry. In another embodiment of this process, a coal-water mixture is blended with at least one additional coal fraction(such as coal, coal-water mixture, or mixtures thereof) until a slurry is produced which contains 60-80 percent of solids and which has the aforementioned particle size distribution; and the coal is cleaned; in this embodiment, it is preferred to clean the coal by cleaning the coal-water slurry.Type: GrantFiled: July 27, 1983Date of Patent: August 28, 1984Assignee: Alfred University Research Foundation, Inc.Inventor: James E. Funk
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Patent number: 4466759Abstract: A method and apparatus for sequence control of vertical movement of slurried particulates from a lower level to the upper levels, more particularly a vertical hoist system for movement of slurry from a subterranean mine area upward through an earthen or cased borehole to a surface station. The vertical pump system includes series-connected pumps having variable speed capability to transport slurry particulate from an underground sump upward to a surface surge tank or other repository. The logic sequence system exercises control over valving sequence between the underground pumps and the vertical borehole in order to control slurry surges during start-up, shut-down and emergency dump operations. Thus, the pump input to the vertical conduit utilizes energy dissipator units as selectively controlled by automated block and by-pass valves to control flow of fluids from the pumps upward through the vertical conduit.Type: GrantFiled: February 22, 1982Date of Patent: August 21, 1984Assignee: Conoco Inc.Inventors: William T. Sweeney, Rick L. Shaw, Frederick A. Webb