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WO2008008295A2 - système d'alimentation - Google Patents

système d'alimentation Download PDF

Info

Publication number
WO2008008295A2
WO2008008295A2 PCT/US2007/015634 US2007015634W WO2008008295A2 WO 2008008295 A2 WO2008008295 A2 WO 2008008295A2 US 2007015634 W US2007015634 W US 2007015634W WO 2008008295 A2 WO2008008295 A2 WO 2008008295A2
Authority
WO
WIPO (PCT)
Prior art keywords
digester
gasifier
rotary valve
feed system
cellulosic material
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/US2007/015634
Other languages
English (en)
Other versions
WO2008008295A3 (fr
Inventor
Lawrence Joseph Nemeth
Thomas Pschorn
Bertil Stromberg
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 WO2008008295A2 publication Critical patent/WO2008008295A2/fr
Publication of WO2008008295A3 publication Critical patent/WO2008008295A3/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. Additionally, the feed system advantageously utilizes a digester, such as an M&D digester, for performing a drying function or for serving as the gasifier.
  • a digester such as an M&D digester
  • a feed system includes a buffer assembly that receives material to be fed to a gasifier, where the buffer assembly includes structure that pre-processes the material for delivery to the gasifier.
  • a first rotary valve is positioned relative to the buffer assembly to receive the material from the buffer assembly.
  • a digester receives the material from the first rotary valve, where the rotary valve conveys the material to the digester and includes a gas lock that prevents gas from escaping the digester.
  • the digester is operable as one of a dryer and a gasifier depending on operating parameters thereof.
  • the feed system further includes a second rotary valve positioned relative to the digester to receive the material from the digester, where the second rotary valve conveys the material to a gasifier and including a gas lock that prevents gas from escaping the gasifier.
  • the buffer assembly preferably includes a buffer bin positioned to receive the material, a plug screw feeder receiving the material from the buffer bin and forming a plug of the material, and a screw transfer conveyor providing a buffer volume of the material to the first rotary valve.
  • the digester may be disposed at an angle relative to vertical and may include a conveyor, where a speed of the conveyor controls a retention time of the material.
  • a method of feeding a comminuted cellulosic material 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) transferring the cellulosic material to a first rotary valve from the screw transfer conveyor; and (e) conveying with the first rotary valve the cellulosic material to a digester while preventing gas from escaping the digester.
  • the method may further include a step of setting operating parameters of the digester such that the digester operates as a gasifier or setting operating parameters of the digester such that the digester operates as a dryer.
  • 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 a digester. DETAILED DESCRIPTION OF THE INVENTION
  • 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 a digester 12.
  • Any known digester may be used.
  • One suitable digester is an M&D digester available from Andritz, Inc.
  • the digester is typically used for kraft pulping of chips or sawdust.
  • the digester vessel is installed at a 45 degree angle, and a midfeather divides the digester into an upper compartment and a lower compartment.
  • a chain conveyor moves the chips or sawdust down the upper compartment and back up the lower compartment. The speed of the conveyor controls the retention time.
  • a digester 12 may be disposed downstream of the screw transfer conveyor 6 via a first rotary valve 9 A.
  • the first rotary valve 9A operates in a manner similar to that of rotary valve 9 described above and includes a gas lock that prevents gas from escaping the digester 12.
  • the digester 12 is operable as either a dryer or a gasifier, depending on operating parameters thereof. That is, depending on the length of the retention time (and possibly other parameters such as temperature, humidity, etc.), the digester may be operable as a dryer (and/or to de-volatize the feed material into the gasifier) or as a gasifier.
  • the feed system also includes a second rotary valve 9B positioned relative to the digester 12 to receive the material from the digester 12.
  • the second rotary valve 9B which functions in a similar manner to the rotary valve 9 described above, conveys the material to the gasifier 10 and includes a gas lock that prevents gas from escaping the gasifier 10.
  • the gasifier 10 shown in the schematic system drawing in FIG. 2 may be eliminated.
  • comminuted cellulosic material can be fed to a pressurized gasifier while preventing any gases from the gasifier from escaping the gasifier into the atmosphere or other equipment upstream of the gasifier.
  • a digester may be incorporated in the system to serve as a dryer or a gasifier.

Landscapes

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

Abstract

L'invention concerne un système d'alimentation contenant un ensemble tampon recevant un matériau à acheminer vers un gazéificateur. L'ensemble tampon possède une structure assurant le prétraitement du matériau à acheminer vers le gazéificateur. Une valve rotative est positionnée par rapport à l'ensemble tampon pour recevoir le matériau de l'ensemble tampon. Un autoclave reçoit le matériau de la première valve rotative, la valve rotative acheminant le matériau vers l'autoclave et contenant un sas de gaz qui empêche le gaz de sortir de l'autoclave. L'autoclave peut fonctionner comme un séchoir et un gazéificateur selon ses paramètres d'exploitation.
PCT/US2007/015634 2006-07-11 2007-07-09 système d'alimentation Ceased WO2008008295A2 (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 (2)

Publication Number Publication Date
WO2008008295A2 true WO2008008295A2 (fr) 2008-01-17
WO2008008295A3 WO2008008295A3 (fr) 2008-04-03

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 After (1)

Application Number Title Priority Date Filing Date
PCT/US2007/015635 Ceased WO2008008296A2 (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
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

Families Citing this family (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

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
AU2003281334A1 (en) * 2002-07-02 2004-01-23 Andritz, Inc. Solvent pulping of biomass

Cited By (2)

* 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
WO2011037606A3 (fr) * 2009-09-24 2013-08-01 Faramarz Bairamijamal Procédé pour transporter à sec et en continu des matières carbonées soumises à une oxydation partielle vers un réacteur de gazéification sous pression

Also Published As

Publication number Publication date
WO2008008296A3 (fr) 2008-10-16
WO2008008295A3 (fr) 2008-04-03
WO2008008296A2 (fr) 2008-01-17
WO2008008296A8 (fr) 2008-12-24

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