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WO2008008296A2 - Système d'alimentation - Google Patents

Système d'alimentation Download PDF

Info

Publication number
WO2008008296A2
WO2008008296A2 PCT/US2007/015635 US2007015635W WO2008008296A2 WO 2008008296 A2 WO2008008296 A2 WO 2008008296A2 US 2007015635 W US2007015635 W US 2007015635W WO 2008008296 A2 WO2008008296 A2 WO 2008008296A2
Authority
WO
WIPO (PCT)
Prior art keywords
gasifier
transfer conveyor
feed system
plug
buffer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2007/015635
Other languages
English (en)
Other versions
WO2008008296A3 (fr
WO2008008296A8 (fr
Inventor
Bertil Stromberg
Lawrence Joseph Nemeth
Thomas Pschorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andritz Inc
Original Assignee
Andritz Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Andritz Inc filed Critical Andritz Inc
Publication of WO2008008296A2 publication Critical patent/WO2008008296A2/fr
Publication of WO2008008296A3 publication Critical patent/WO2008008296A3/fr
Publication of WO2008008296A8 publication Critical patent/WO2008008296A8/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/16—Over-feed arrangements
    • F23K3/18—Spreader stokers
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/02—Fixed-bed gasification of lump fuel
    • C10J3/20—Apparatus; Plants
    • C10J3/30—Fuel charging devices
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/15—Details of feeding means
    • C10J2200/156—Sluices, e.g. mechanical sluices for preventing escape of gas through the feed inlet
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2200/00—Details of gasification apparatus
    • C10J2200/15—Details of feeding means
    • C10J2200/158—Screws
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
    • C10J2300/00—Details of gasification processes
    • C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
    • C10J2300/0913—Carbonaceous raw material
    • C10J2300/0916—Biomass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2201/00—Pretreatment of solid fuel
    • F23K2201/20—Drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/10—Supply line fittings
    • F23K2203/103—Storage devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2203/00—Feeding arrangements
    • F23K2203/20—Feeding/conveying devices
    • F23K2203/202—Feeding/conveying devices using screws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K2900/00—Special features of, or arrangements for fuel supplies
    • F23K2900/03001—Airlock sections in solid fuel supply lines

Definitions

  • the invention relates generally to feed systems and, more particularly, to a feed system for feeding comminuted cellulosic material to a pressurized gasifier.
  • the byproducts of an industrial plant process can be used to produce fuel and/or electrical power using a gasifier.
  • Feed material introduced into the gasifier is combusted at high temperatures.
  • the contents of the gasifier are explosive and/or corrosive in nature and must be contained within the gasifier during normal operations and during startup and shut down of the gasifier. It is important that contents from the gasifier are prevented from entering upstream components that feed material to the gasifier.
  • Existing feed systems require batch feeding arrangements using multiple hatches to contain the gasifier contents or large alternating valve arrangements combined with pressurized feed-hoppers or the like. Such arrangements are expensive to manufacture and inefficient to operate.
  • the feed system described herein includes structure that feeds the material while preventing the contents of the gasifier from coming in contact with upstream components and from escaping to the atmosphere.
  • a gasifier feed system includes a buffer assembly that receives material, such as comminuted cellulosic material to be fed to a gasifier and includes structure that pre-processes the material for delivery to the gasifier.
  • a source of pressurized inert gas is coupled with the buffer assembly.
  • a rotary valve is positioned relative to the buffer assembly to receive the material from the buffer assembly. The rotary valve. conveys the material to the gasifier and includes a gas lock that prevents gas from escaping the gasifier.
  • the gasifier feed system includes a buffer bin positioned to receive material to be fed to a gasifier, a plug screw feeder disposed in communication with the buffer bin and receiving the material from the buffer bin to form a plug of the material, and a screw transfer conveyor disposed in communication with the plug screw feeder and receiving the material plug from the plug screw feeder to provide a buffer volume of the material.
  • a source of inert gas is coupled with the screw transfer conveyor, preferably adjacent an entry for the material plug, which source introduces pressurized inert gas into the screw transfer conveyor.
  • a rotary valve which may be a wet feeder or a dry feeder, is positioned relative to the screw transfer conveyor to receive the material from the screw transfer conveyor.
  • the rotary valve conveys the material to the gasifier and includes a gas lock that prevents gas from escaping the gasifier.
  • a back stop may he disposed at a downstream end of the plug screw feeder for closing off the plug screw feeder from downstream equipment.
  • a source of steam may be coupled with the buffer bin for adding steam to the material.
  • the system may also include drying units disposed upstream of the buffer bin and/or between the screw transfer conveyor and the rotary valve.
  • a method of feeding a comminuted cellulosic material to a gasifier includes the steps of (a) receiving the cellulosic material in a buffer bin; (b) feeding the cellulosic material to a plug screw feeder disposed in communication with the buffer bin and forming a plug of the cellulosic material; (c) conveying the material plug to a screw transfer conveyor and providing a buffer volume of the cellulosic material; (d) introducing inert gas into the screw transfer conveyor; (e) transferring the cellulosic material to a rotary valve from the screw transfer conveyor; and (f) conveying with the rotary valve the cellulosic material to the gasifier while preventing gas from escaping the gasifier.
  • FIGURE 1 is an exemplary schematic illustration of a gasifier feed system
  • FIGURE 2 is an exemplary schematic illustration of a gasifier feed system, including one or more dryers.
  • FIG. 1 is an exemplary schematic illustration of a feed system for feeding comminuted cellulosic material to a pressurized gasifier.
  • Wood chips or other comminuted cellulosic fibrous material are conveyed from a storage silo or pile 1 to a buffer bin 2.
  • the buffer bin 2 may be a chip bin such as the DIAMONDBACK ® chip bin sold by Andritz Inc. of Glens Falls, New York or other similar chip bin.
  • the chip bin 2 may include a source of steam such that steam may be added to the cellulosic material. The steam source is optional.
  • the cellulosic material is fed to a plug screw feeder 3. Any type of known plug screw feeder may be utilized.
  • a back stop or blowback valve (blowback damper) 5 is disposed adjacent the discharge end of the plug screw feeder 3.
  • the back stop 5 serves to close off the plug screw feeder 3 from downstream equipment if the flow of material or density of the plug inside the plug screw feeder 3 is lost. That is, the back stop 5 comprises a preloaded valve or cone that closes the feeder in the event of a pressure drop in the feeder.
  • the back stop 5 serves to prevent the escape of any gas from the gasifier into the atmosphere or other equipment upstream of the gasifier.
  • the plug screw feeder 3 may be designed with holes or slots in the screw-housing/basket or the following spool piece to squeeze-out water/moisture (to increase the dry-content of the feed material), extractives and/or other volatile components, thus simplifying the gas cleaning process after the gasifier.
  • the plug of cellulosic material formed in the plug screw feeder 3 is discharged into a screw transfer conveyor 6.
  • a continuous flow of inert gas such as nitrogen, argon, carbon dioxide, and/or any other non-dangerous gas
  • inert gas source 8 is introduced from an inert gas source 8 to the screw transfer conveyor 6.
  • This continuous flow of inert gas 8 is provided at a higher pressure than the pressure in the gasifier, thereby providing a continuous purging of the screw transfer conveyor 6 to keep any dangerous gases from escaping from the gasifier into the atmosphere or to the conveyor 6 or to the plug screw feeder 3. Rather, due to the higher pressure gas supply, in the event of any exposure of the gasifier entrance, the harmless inert gas flows into the gasifier, and the gasifier contents are prevented from escaping.
  • the material plug is broken up for further processing.
  • the screw transfer conveyor 6 provides a buffer volume of cellulosic material upstream of a rotary valve 9.
  • the rotary valve 9 provides for conveyance of the cellulosic material into the gasifier 10 as well as providing a gas-lock to prevent the escape of gases from the gasifier 10 and mixing with the cellulosic material while it is a plug. Any known rotary valve suitable for this purpose may be used.
  • the rotary valve can be a wet or dry feeder such as a "Bauer Rotary Valve" or a low pressure feeder available from Andritz Inc.
  • the inert gas 8 could be used to purge the rotor of the rotary valve 9.
  • the gasses would be purged into the gasifier 10.
  • the rotary feeder serves to keep mixing of the gasifier contents and conveyor to a minimum, should the screw transfer conveyor lose its pressure holding capability.
  • the cellulosic material is conveyed from the rotary valve 9 and enters the gasifier 10.
  • FIG. 2 shows an alternative feed system including one or more dryers 12.
  • a dryer 12 may be disposed upstream of the buffer bin 2 and/or between the screw transfer conveyor 6 and the rotary valve 9.
  • the dryer(s) 12 may be vertical or horizontal dryers and serve to extract moisture from the feed material prior to delivery to the gasifier 10 and/or to de-volatize the feed material into the gasifier.
  • the feed material can be wood chips, wood waste, saw dust and shavings, annual fiber residual and other cellulosic feed material.
  • the plug screw feeder 3 or similar device provides a pressure seal by forming a solid plug of feed material (plug or pipe shape at discharge of unit).
  • the unit may include a perforated screen or bar cage in the compression housing to squeeze and extract, for example, wood extractives such as pitch, turpentine, tannin and other extractives as well as volatile compounds that can be collected for a controlled removal (concentrated effluent stream) and/or can be collected for recovery.
  • a perforated screen or bar cage in the compression housing to squeeze and extract, for example, wood extractives such as pitch, turpentine, tannin and other extractives as well as volatile compounds that can be collected for a controlled removal (concentrated effluent stream) and/or can be collected for recovery.
  • This arrangement serves to increase the uniformity of the feed material (i.e., bulk density, size, moisture etc.), and increases dryness to make the moisture content more uniform and condition the feed material.
  • the plug screw feeder 3 can be driven by a constant or variable speed drive.
  • the discharge from the feeder 3 goes into a spool piece, pipe or similar device such as the transfer conveyor 6, which may also include a blowback damper. Water or chemicals may be injected at discharge/spool piece or the following connection pipe.
  • the gasifier 10 may also be termed a boiler.
  • the process can be efficiently utilized to produce syngas.
  • NCG Non-Condensable-Gases
  • vent etc.
  • comminuted cellulosic material can be fed to a pressurized gasifier while preventing any gases from the gasif ⁇ er from escaping the gasifier into the atmosphere or other equipment upstream of the gasifier.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Treatment Of Sludge (AREA)
  • Paper (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un système d'alimentation de gazéificateur contenant un ensemble tampon recevant un matériau, comme un matériau de cellulose pulvérisé à acheminer vers un gazéificateur, et comportant une structure de prétraitement du matériau à acheminer vers le gazéificateur. Une source de gaz inerte pressurisé est couplée à l'ensemble tampon. Une valve rotative est positionnée par rapport à l'ensemble tampon pour recevoir le matériau de l'ensemble tampon. La valve rotative achemine le matériau vers le gazéificateur et contient un sas de gaz qui empêche le gaz de sortir du gazéificateur.
PCT/US2007/015635 2006-07-11 2007-07-09 Système d'alimentation Ceased WO2008008296A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US81964606P 2006-07-11 2006-07-11
US60/819,646 2006-07-11
US90849507P 2007-03-28 2007-03-28
US60/908,495 2007-03-28

Publications (3)

Publication Number Publication Date
WO2008008296A2 true WO2008008296A2 (fr) 2008-01-17
WO2008008296A3 WO2008008296A3 (fr) 2008-10-16
WO2008008296A8 WO2008008296A8 (fr) 2008-12-24

Family

ID=38923815

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2007/015634 Ceased WO2008008295A2 (fr) 2006-07-11 2007-07-09 système d'alimentation
PCT/US2007/015635 Ceased WO2008008296A2 (fr) 2006-07-11 2007-07-09 Système d'alimentation

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/US2007/015634 Ceased WO2008008295A2 (fr) 2006-07-11 2007-07-09 système d'alimentation

Country Status (1)

Country Link
WO (2) WO2008008295A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9115214B2 (en) 2012-09-24 2015-08-25 Abengoa Bioenergy New Technologies, Llc Methods for controlling pretreatment of biomass

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2302018A1 (fr) * 2009-09-24 2011-03-30 Faramarz Bairamijamal Procédé de transport continu à sec d'un matériau devant être oxydé partiellement pour le revêtement d'un réacteur mis sous pression

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773610A (en) * 1970-12-11 1973-11-20 Bauer Bros Co Pressurized system for pulp refining including pressurized double disk treatment
SE8205276L (sv) * 1982-09-15 1984-03-16 Erik Gustav Kroneld Sett att genom indirekt uppvermning torka material
FI99051C (fi) * 1992-10-08 1997-09-25 Imatran Voima Oy Menetelmä ja kytkentä polttoaineen paineenalaiseen tilaan syöttämisen helpottamiseksi
US5666890A (en) * 1994-06-22 1997-09-16 Craig; Joe D. Biomass gasification system and method
US5388537A (en) * 1994-08-02 1995-02-14 Southern California Edison Company System for burning refuse-derived fuel
WO2004005608A1 (fr) * 2002-07-02 2004-01-15 Andritz, Inc. Reduction en pate de biomasse, a l'aide de solvants

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9115214B2 (en) 2012-09-24 2015-08-25 Abengoa Bioenergy New Technologies, Llc Methods for controlling pretreatment of biomass

Also Published As

Publication number Publication date
WO2008008295A2 (fr) 2008-01-17
WO2008008295A3 (fr) 2008-04-03
WO2008008296A3 (fr) 2008-10-16
WO2008008296A8 (fr) 2008-12-24

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