US20050039651A1 - Variable speed pyrolytic waste treatment system - Google Patents

Variable speed pyrolytic waste treatment system Download PDF

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Publication number
US20050039651A1
US20050039651A1 US10/923,183 US92318304A US2005039651A1 US 20050039651 A1 US20050039651 A1 US 20050039651A1 US 92318304 A US92318304 A US 92318304A US 2005039651 A1 US2005039651 A1 US 2005039651A1
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United States
Prior art keywords
chamber
waste
paddles
movement mechanism
pyrolysis
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.)
Abandoned
Application number
US10/923,183
Inventor
Cameron Cole
Raul Torres
Toby Cole
Dan Watts
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International Environmental Solutions Corp
International Environmental Solutions Corpora
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International Environmental Solutions Corpora
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 International Environmental Solutions Corpora filed Critical International Environmental Solutions Corpora
Priority to US10/923,183 priority Critical patent/US20050039651A1/en
Publication of US20050039651A1 publication Critical patent/US20050039651A1/en
Assigned to INTERNATIONAL ENVIRONMENTAL SOLUTIONS CORPORATION reassignment INTERNATIONAL ENVIRONMENTAL SOLUTIONS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: COLE, CAMERON, COLE, TOBY L., TORRES, RAUL DE LA, WATTS, DAN
Priority to US11/501,374 priority patent/US20070186829A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/12—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating using gaseous or liquid fuel
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
    • C10B47/28—Other processes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
    • C10B47/28—Other processes
    • C10B47/32—Other processes in ovens with mechanical conveying means
    • C10B47/44—Other processes in ovens with mechanical conveying means with conveyor-screws
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F23G5/0273—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage using indirect heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/04—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste liquors, e.g. sulfite liquors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
    • F23M5/00—Casings; Linings; Walls
    • F23M5/02—Casings; Linings; Walls characterised by the shape of the bricks or blocks used
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2201/00—Pretreatment
    • F23G2201/30—Pyrolysing
    • F23G2201/303—Burning pyrogases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2206/00—Waste heat recuperation
    • F23G2206/10—Waste heat recuperation reintroducing the heat in the same process, e.g. for predrying
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/12—Heat utilisation in combustion or incineration of waste
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

Definitions

  • the field of the invention is pyrolytic waste treatment.
  • Pyrolysis is a known method for treatment of waste. Examples of pyrolytic waste treatment systems can be found in U.S. Pat. Nos. 4,759,300, 5,653,183, 5,868,085, and 6,619,214. Unlike incineration, pyrolysis is the destructive decomposition of waste materials using indirect heat in the absence of oxygen. Burning wastes through incineration with direct flame in the presence of oxygen can be explosive, causing turbulence in the burning chamber, which fosters a recombination of released gases. Waste destruction in an oxygen-rich atmosphere makes conversion far less complete, is highly inefficient and creates harmful substances.
  • the pyrolytic process employs high temperature in, most desirably, an atmosphere substantially free of oxygen (for example, in a practical vacuum), to convert the solid components of waste to a mixture of solids, liquids, and gases with proportions determined by operating temperature, pressure, oxygen content, and other conditions.
  • the solid residue remaining after pyrolysis commonly is referred to as char.
  • the vaporized product of pyrolysis is often further treated by a process promoting oxidation, which “cleans” the vapors to eliminate oils and other particulate matter there from, allowing the resultant gases then to be safely released to the atmosphere.
  • the present subject matter is directed toward a pyrolytic waste treatment system in which a movement mechanism is used to move waste through the pyrolysis chamber at various rates along the length of the pyrolysis chamber.
  • a method of pyrolyzing waste in an elongated chamber comprises moving the waste through the chamber at different rates along the length of the chamber.
  • FIG. 1 is a schematic of a pyrolytic waste treatment system.
  • a pyrolytic waste treatment system 100 generally comprises a pyrolytic chamber 910 and a waste movement mechanism 960 .
  • the speed at which waste moves through the chamber 910 , and the temperature of the chamber 910 will both vary along the length of the chamber 910 .
  • the ends of the chamber are generally cooler than portions of the chamber closer to the center of the chamber.
  • waste movement mechanism 960 varies along the length of pyrolysis chamber 910 to increase movement speed at the cooler ends, and to slow it down in the active heating region.
  • mechanism 960 comprises screw conveyor section 961 adapted to move waste quickly through section 911 away from waste inlet 930 .
  • mechanism 960 comprises a first paddle section 962 wherein the paddles are oriented primarily to agitate, mix, and expose waste to heat rather than move it along the chamber 910 . Movement of waste through section 912 occurs to a large extent from being pushed by waste moving into section 912 from section 911 .
  • a second paddle section 963 has paddles oriented to move waste along section 913 to char outlet 940 .
  • the screw conveyer and paddles are coupled to, and may be integrally formed with, a drive shaft 969 .
  • Screw conveyor section 961 of mechanism 960 is in some embodiments about 5 feet long, and the screw blades are pitched at varying degrees.
  • section 962 is about 20 feet long, and comprises approximately 42 paddles, wherein at least some of the paddles are oriented such that at least one side is substantially parallel to the center axis of shaft 969 .
  • the section 963 of mechanism 960 in some embodiments the last 5 feet of mechanism 960 ) of paddles system are pitched/angled to move the waste that has already reached the proper temperature quickly out of the actively heated zone.
  • a movement mechanism comprising a screw and paddles mounted to a single drive shaft
  • alternative embodiments may use alternative apparatus and or methods to vary the speed at which material moves through pyrolysis chambers.
  • some embodiments may utilize multiple movement mechanisms rather than a single movement mechanism.
  • Others may utilize paddles along the entire length of the chamber, may utilize paddles followed by a screw conveyor, may utilize only a screw conveyer or may utilize an entirely different type of mechanism such as one or more flat conveyers.
  • a pyrolytic waste treatment system particularly a continuous feed system adapted to move waste being treated at different speeds along the length of a pyrolysis chamber. Variances in speed my result from varying the pitch of paddles and/or screws used to move the waste along the length of the pyrolysis chamber.
  • Energy savings and improved treatment can be achieved in a pyrolysis treatment system which varies the rate of movement of material through a pyrolysis chamber.
  • material moving material at a slower rate when towards the center of the chamber relative to when it first enters the chamber and when it approaches the chamber exit minimizes heat losses at the chamber entrance and exit while insuring the waste is adequately heated for treatment.
  • Varying the rate of movement may be achieved through the use of paddles or a screw in which the pitch of the paddles or the screw threads varies from one end of the chamber to the other.

Abstract

The inventive subject matter is directed toward a pyrolytic waste treatment system comprising a pyrolysis chamber and a movement mechanism adapted to move waste through the pyrolysis chamber at different speeds along the length of the pyrolysis chamber.

Description

  • This application claims the benefit of U.S. provisional application No. 60/497397 filed on 21 Aug. 2003 incorporated herein by reference in its entirety.
    • FIELD OF THE INVENTION
  • The field of the invention is pyrolytic waste treatment.
    • BACKGROUND OF THE INVENTION
  • Pyrolysis is a known method for treatment of waste. Examples of pyrolytic waste treatment systems can be found in U.S. Pat. Nos. 4,759,300, 5,653,183, 5,868,085, and 6,619,214. Unlike incineration, pyrolysis is the destructive decomposition of waste materials using indirect heat in the absence of oxygen. Burning wastes through incineration with direct flame in the presence of oxygen can be explosive, causing turbulence in the burning chamber, which fosters a recombination of released gases. Waste destruction in an oxygen-rich atmosphere makes conversion far less complete, is highly inefficient and creates harmful substances.
  • In contrast, the pyrolytic process employs high temperature in, most desirably, an atmosphere substantially free of oxygen (for example, in a practical vacuum), to convert the solid components of waste to a mixture of solids, liquids, and gases with proportions determined by operating temperature, pressure, oxygen content, and other conditions. The solid residue remaining after pyrolysis commonly is referred to as char. The vaporized product of pyrolysis is often further treated by a process promoting oxidation, which “cleans” the vapors to eliminate oils and other particulate matter there from, allowing the resultant gases then to be safely released to the atmosphere.
  • What has long been needed and heretofore has been unavailable is an improved pyrolytic waste treatment system that is highly efficient, is easy to maintain, is safe, reliable and capable of operation with a wide variety of compositions of waste materials, and that can be constructed and installed at relatively low cost. The thrust of the present invention is to provide such an improved pyrolytic waste treatment system.
    • SUMMARY OF THE INVENTION
  • The present subject matter is directed toward a pyrolytic waste treatment system in which a movement mechanism is used to move waste through the pyrolysis chamber at various rates along the length of the pyrolysis chamber.
  • In another aspect, a method of pyrolyzing waste in an elongated chamber comprises moving the waste through the chamber at different rates along the length of the chamber.
  • Various objects, features, aspects and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, along with the accompanying drawings in which like numerals represent like components.
    • BRIEF DESCRIPTION OF THE DRAWING
  • FIG. 1 is a schematic of a pyrolytic waste treatment system.
    • DETAILED DESCRIPTION
  • In FIG. 1, a pyrolytic waste treatment system 100 generally comprises a pyrolytic chamber 910 and a waste movement mechanism 960.
  • It is contemplated that it would be beneficial to vary the rate of movement of material through a pyrolysis chamber. In particular, material might move at a slower rate when it first enters the chamber and move at a faster rate after it has been heated and as is moved toward the chamber exit. It is contemplated that the use of paddles or a screw in which the pitch of the paddles or the screw threads varies from one end of the chamber to the other would prove beneficial. It should be recognized that other methods and devices may be used to move material through the chamber including, for example, using gravity, magnetism, and forced air. With regard to using magnetism, it is further contemplated that a product could be statically charged within a magnetic field. Other methods and devices are also contemplated so long as they move the product through the chamber and are in accordance with the inventive concepts described herein.
  • It is preferred that the speed at which waste moves through the chamber 910, and the temperature of the chamber 910 will both vary along the length of the chamber 910. At least in part in order to minimize heat loss, the ends of the chamber are generally cooler than portions of the chamber closer to the center of the chamber. As such, waste movement mechanism 960 varies along the length of pyrolysis chamber 910 to increase movement speed at the cooler ends, and to slow it down in the active heating region.
  • In section 911 of chamber 910, mechanism 960 comprises screw conveyor section 961 adapted to move waste quickly through section 911 away from waste inlet 930. In section 912, where active heating occurs, mechanism 960 comprises a first paddle section 962 wherein the paddles are oriented primarily to agitate, mix, and expose waste to heat rather than move it along the chamber 910. Movement of waste through section 912 occurs to a large extent from being pushed by waste moving into section 912 from section 911. In section 913, a second paddle section 963 has paddles oriented to move waste along section 913 to char outlet 940. The screw conveyer and paddles are coupled to, and may be integrally formed with, a drive shaft 969.
  • Screw conveyor section 961 of mechanism 960 is in some embodiments about 5 feet long, and the screw blades are pitched at varying degrees. In some embodiments, section 962 is about 20 feet long, and comprises approximately 42 paddles, wherein at least some of the paddles are oriented such that at least one side is substantially parallel to the center axis of shaft 969. In contrast, the section 963 of mechanism 960 (in some embodiments the last 5 feet of mechanism 960) of paddles system are pitched/angled to move the waste that has already reached the proper temperature quickly out of the actively heated zone.
  • Although a movement mechanism comprising a screw and paddles mounted to a single drive shaft is shown, alternative embodiments may use alternative apparatus and or methods to vary the speed at which material moves through pyrolysis chambers. As an example, some embodiments may utilize multiple movement mechanisms rather than a single movement mechanism. Others may utilize paddles along the entire length of the chamber, may utilize paddles followed by a screw conveyor, may utilize only a screw conveyer or may utilize an entirely different type of mechanism such as one or more flat conveyers.
  • A pyrolytic waste treatment system, particularly a continuous feed system adapted to move waste being treated at different speeds along the length of a pyrolysis chamber. Variances in speed my result from varying the pitch of paddles and/or screws used to move the waste along the length of the pyrolysis chamber.
  • Energy savings and improved treatment can be achieved in a pyrolysis treatment system which varies the rate of movement of material through a pyrolysis chamber. In particular, material moving material at a slower rate when towards the center of the chamber relative to when it first enters the chamber and when it approaches the chamber exit minimizes heat losses at the chamber entrance and exit while insuring the waste is adequately heated for treatment. Varying the rate of movement may be achieved through the use of paddles or a screw in which the pitch of the paddles or the screw threads varies from one end of the chamber to the other.
  • Thus, specific embodiments and applications of a pyrolytic system have been disclosed. It should be apparent, however, to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the appended claims. Moreover, in interpreting both the specification and the claims, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced.

Claims (10)

1. A pyrolytic waste treatment system, comprising:
a pyrolysis chamber; and
a movement mechanism adapted to move waste through the pyrolysis chamber at different speeds along the length of the pyrolysis chamber.
2. The system of claim 1, wherein the movement mechanism comprises a screw.
3. The system of claim 1, wherein the movement mechanism comprises brushes.
4. The system of claim 1, wherein the movement mechanism comprises a set of paddles having pitches that vary along at least a portion of the length of the pyrolysis chamber.
5. The system of claim 1, wherein the movement mechanism comprises a screw conveyor and a plurality of paddles wherein the paddles vary in pitch along at least a portion of the length of the pyrolysis chamber.
6. The system of claim 5, wherein the screw conveyer and plurality of paddles are all coupled to a common shaft that extends along the length of the pyrolysis chamber.
7. The system of claim 1, wherein the movement mechanism is adapted to move waste through the pyrolysis chamber at a faster rate neat the ends of the chamber relative to the center of the center of the chamber.
8. A method of pyrolyzing waste in an elongated chamber comprising moving waste through the chamber at different rates along the length of the chamber.
9. The method of claim 8, wherein paddles having varied pitches are used to move waste through the chamber.
10. The method of claim 8, wherein a screw conveyer is used to move waste at an end of the chamber at which it enters the chamber, and a plurality of paddles are used to move the waste through the remainder of the chamber.
US10/923,183 2003-08-21 2004-08-19 Variable speed pyrolytic waste treatment system Abandoned US20050039651A1 (en)

Priority Applications (2)

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US10/923,183 US20050039651A1 (en) 2003-08-21 2004-08-19 Variable speed pyrolytic waste treatment system
US11/501,374 US20070186829A1 (en) 2003-08-21 2006-08-08 Variable speed pyrolytic waste treatment system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US49739703P 2003-08-21 2003-08-21
US10/923,183 US20050039651A1 (en) 2003-08-21 2004-08-19 Variable speed pyrolytic waste treatment system

Related Child Applications (1)

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US10/923,140 Expired - Fee Related US6988453B2 (en) 2003-08-21 2004-08-19 Outlets for a pyrolytic waste treatment system
US10/923,183 Abandoned US20050039651A1 (en) 2003-08-21 2004-08-19 Variable speed pyrolytic waste treatment system
US10/923,179 Expired - Fee Related US7000551B2 (en) 2003-08-21 2004-08-19 Chamber support for pyrolytic waste treatment system
US10/923,467 Active US7044069B2 (en) 2003-08-21 2004-08-19 Multi retort pyrolytic waste treatment system

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US10/923,140 Expired - Fee Related US6988453B2 (en) 2003-08-21 2004-08-19 Outlets for a pyrolytic waste treatment system

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US10/923,179 Expired - Fee Related US7000551B2 (en) 2003-08-21 2004-08-19 Chamber support for pyrolytic waste treatment system
US10/923,467 Active US7044069B2 (en) 2003-08-21 2004-08-19 Multi retort pyrolytic waste treatment system

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US (4) US6988453B2 (en)
EP (4) EP1668293A2 (en)
JP (4) JP4286864B2 (en)
KR (4) KR100754076B1 (en)
CN (4) CN1864030B (en)
AU (4) AU2004268209B2 (en)
BR (4) BRPI0413811A (en)
CA (4) CA2536344C (en)
WO (5) WO2005022038A2 (en)

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