Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3779182 A
Publication typeGrant
Publication dateDec 18, 1973
Filing dateAug 24, 1972
Priority dateAug 24, 1972
Publication numberUS 3779182 A, US 3779182A, US-A-3779182, US3779182 A, US3779182A
InventorsCamacho S
Original AssigneeCamacho S
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Refuse converting method and apparatus utilizing long arc column forming plasma torches
US 3779182 A
Abstract
A method and apparatus are disclosed which are based on utilizing a plural number of long arc column forming plasma torches in combination with a refractory lined furnace chamber to continuously pyrolyze household and industrial refuse material fed into the chamber and convert the same to usable materials and useful forms of energy.
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

O Umted States Patent [1 1 [111 3,779,182

Camacho 1 Dec. 18, 1973 REFUSE CONVERTING METHOD AND 3,173,388 3/1965 Menrath et a1 110/8 E APPARATUS UTILIZING LONG ARC 3,503,347 3/1970 Marr, Jr et al..... 110/8 R 3,404,078 10/1968 Goldberger 219/121 P COLUMN FORMING PLASMA TORCHES 3.290.552 12/1966 Van Ornum 219/75 Salvador L. Camacho, ONeal Rd, Raleigh, NC. 27602 Filed: Aug. 24, 1972 Appl. No; 283,516

lnventor:

US. Cl 110/8 R, llO/l8 E, 110/8 E, 219/121, 219/75 Int. Cl. F23g 5/12 Field of Search 110/8 R, 8 E, 18 C, 1 10/8 C, 18 E; 219/12], 72-75, 383

References Cited UNITED STATES PATENTS 11/1970 Zanft 110/8 R Primary Examinerl(enneth W. Sprague Assistant Examiner-Henry C. Yuen Ar!0rne vB. B. Olive [57] ABSTRACT A method and apparatus are disclosed which are based on utilizing a plural number of long are column forming plasma torches in combination with a refractory lined furnace chamber to continuously pyrolyze household and industrial refuse material fed into the chamber and convert the same to usable materials and useful forms of energy.

10 Claims, 4 Drawing Figures REFUSE CONVERTING METHOD AND APPARATUS UTILIZING LONG ARC COLUMN FORMING PLASMA TORCI-IES CROSS-REFERENCE TO RELATED APPLICATIONS This invention is related to copending application, Serial No. 283,552, entilted Trough Hearth Construction And Method For Plasma Arc Furnace, which discloses an electric circuit for initiating and sustaining long arc plasma columns utilizing long are column forming plasma generators or torches of the type previously taught in U.S. Pat. No. 3,673,375, entitled Long Arc Column Plasma Generator and Method," issued to the same inventor.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to methods and apparatus for. reducing the physical weight and volume of refuse by'subjecting it to direct radiated. and convected heat from a long plasma arc column.

2. Description of the Prior Art 7 Pyrolysis (or destructive distillation) techniques were until very recently unrecognized 'as a means for. converting'municipal and industrial refuse into useful solid, liquid and gaseous products. In the past, conventional incinerators have been widely used to reduce refuse to ash through combustion. This process necessarily introduced fly. ash and many other types of airborne pollutants into the' atmosphere, due to the tremendous amounts of air utilized to effect combustion. vAs an alternate measure, sanitary landfills were developed to prevent air pollution. It is now recognized, however, that water leaching through such landfills may constitute a pollutant to ground water. It is a well-known and documented fact that refuse contains both combustible and non-combustible materials. The University of California, as a result of a study analyzing municipal refuse, has stated that the composition of municipal mixed" (unsegregated) refuse by weight is: cans, 9.8 percent, bottles and glass, 1 1.7 percent; metals (other than cans) 0.9 percent; other 77.6 percent. (See University of California Technical Bulletin No. 9, Sanitary Engineering Laboratory 1973 American Public Works Association, ."Municipal Refuse Disposal). It is also a well-known fact that the non-combustible portion which approximates 25 percentof the total weight of refuse is never appreciably reduced by either conventional incineration or landfill practices. Typically, these items are either shredded and buried at the landfill or are simply heaped near the incinerator.

In its I970 study entitled Conversion of Municipal and Industrial Refuse into Useful Materials by Pyrolysis, the United States Department of the Interior, Bureau of Mines, revealed the usefulness of pyrolyzing refuse and obtaining usable solid, liquid, and gaseous products. In this study, various samples of shredded municipal and industrial refuse with the metallic component largely removed were placed in a sealed retort and subjected to various levels of conducted heat to as much as 900 centigrade. Among the resulting products were solid residue (a source of charcoal briquettes and filter medium), propane, ethylene and methane gas, solid ammonium sulphate, tar, light oil (a soure of benzene and toluene) and liquor 95 percent water and the remainder formed of acids, ketones and aldehydes). In

terms of recoverable heat energy, the products of pyrolysis of refuse produced more than a sufficient Btu content to provide the heat for pyrolysis. (See W. S. Sanner et al.: Conversion of Municipal and Industrial Refuse into Useful Materials by Pyrolysis," Report of Investigations No. 7428, U.S. Department of the Interior, Bureau of Mines, August, 1970.)

Although the study conducted by the Bureau of Mines was instrumental in determining the potential value of converting refuse into usable products by pyrolysis, it did not suggest an efficient method and apparatus to do so. The system used was based upon a batch method of charging the retort and did not suggest a method and apparatus for more efficient continuousoperation. Furthermore, the solid residue contained bottle caps and bits of metal which required further separation before the solid residue could be utilized. In addition, the bulk of the metallic refuse component was required tobe segregated from the combustible or carbonaceous component prior to pyrolysis, and the combustible component required drying and shredding. for maximum efficiency of the process.

Additional prior art has suggested the use of conventional arc-forming electrodes. in an incinerator in U.S. Pat. No. 3,503,347 to intermittantly generate heat and thereby reduce the volume and weight of waste confined inside the incinerator. The above patent does not, however, teach the continuous operation of such an incinerator and does not teach a practical application of the evolved noxious gases. In general, the prior art has not suggested an efficient method and apparatus utilizing long arc column plasma torches for reducing substantially large amounts of unsegregated refuse to usable and valuable products from which energy may be readily obtained, while at the same time not polluting the environment. Furthermore, the prior art has not suggested such a method and apparatus which would be adapted for continuous rather than batch operation and capable of reducing the physical weight and volume of substantially large amounts of refuse while generating more energy than being consumed.

SUMMARY OF THE INVENTION This invention utilizes a plurality of long are column forming plasma torches in combination with a furnace chamber to thermally decompose unsegregated refuse into a gaseous and molten fluid state. Conveyor means are adapted to continuously supply refuse to the furnace chamber while smoke recycling means are adapted to prevent the gases being produced within the chamber from escaping. The furnace chamber is formed so as to have a somewhat bowl-shaped refractor lined interior hearth portion into which the long are forming plasma torches are directed. The hearth portion further includes a normally electrically disconnected graphite electrode but which may be appropriately connected into the electrical circuit when needed as an electrode. A lip formed along one edge of the refractory material provides a fluid outlet for the molten refuse. Pyrolysis of the refuse proceeds as long are plasmas are generated between the various torches residing in vertical wall portions of the furnace chamber, and molten metallic portions of the refuse collects in the hearth. The heat radiated and convected from the generated long are plasma columns is sufficient to reduce the remaining organic and non-combustible portion of the refuse to either a molten or gaseous state. Some of the evolved gases rise, preheat the refuse and are then reintroduced into the reduction process. In a preferred embodiment as the molten refuse reaches the level of the outlet lip it is oxidized by an incoming stream of gas, e.g., air. The oxidized molten refuse then enters a water bath which effectively provides a water seal and forms into a solid slag for later recovery by appropriate handling means. In some instances the slag may be maintained heated for purposes of molding the same. The gaseous products of the pyrolyzed refuse are simultaneously converted into saturated steam and other gases which may beneutralized or combusted by introduction of gases other than thementioned air. The hot gases may then drive appropriate energy conversion means such as a turbine generator and may be scrubbed or otherwise purified before being released to the atomosphere.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional side view ofa typical refuse converting apparatus according to the invention.

FIG. 2 is a cutaway side view of a long arc column forming plasma torch employed in the instant invention generally shown in operating position inside a furnace chamber.

FIG. 3 is a top plan view of a refuse converting apparatus according to the invention.

FIG. 4 is a somewhat schematic diagram of an electrical circuit employed in the instant invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIG. 1, as previously mentioned, the present invention is directed to an apparatus and method for continuously reducing by pyrolysis the physical weight and volume of municipal and industrial refuse material and converting it into energy, recoverable and useful products, utilizing long are column plasma generators, also known in the art as plasma torches. In a preferred embodiment, a complete refuse converting apparatus includes a furnace chamber a plurality of directionally stable long arc column forming plasma torches, generally designated 12, of the type disclosed in previously referred to US. Pat. No. 3,673,375, projecting through selected apertures 11 in vertical walls 14 of said furnace chamber 15. Also included is a somewhat concave refractory lined furnace hearth 17 having an integrally formed graphite electrode 18. Said refuse converting apparatus is also provided with a refuse hopper 20 including sealed refuse conveying means 21 and smoke recovery means 23, together being adapted to continuously feed refuse materials into said furnace chamber 15, while maintaining smoke and noxious gases within the chamber. The term refuse as used in this disclosure includes raw unsegregated refuse of a municipal or industrial nature or any mixture of both. By unsegregated" what is meant is that organic wastes are mixed with tin cans, bottles, paper, etc.

In accordance with the instant invention during operation, later described in greater detail, each plasma torch 12 is adapted to form a transferred long arc column of from 10 to inches with molten refuse material 19 a portion of which is metallic. Due to the intense heat being generated (1,000 to 2,000K), the nonmolten refuse (represented by dashed lines 22) is rapidly pyrolyzed into gaseous and molten fluid components in the absence, at this point, of appreciable combustion.

Hot gases and molten refuse evolved from the heat of the arc columns flow past a lip 16 formed in the concave refractory lined hearth 17 and into an oxidation chamber 30 which includes a gas inlet manifold 31 for oxygen or air which enables the evolved gases to be combusted into an oxidation dioxide and steam vapor. Depending on the nature of the refuse gases produced, gases other than air or oxygen may be introduced to combust or neutralize such refuse gases. Gas vent 32 receives the hot combusted vapor while a water bath 33 receives the molten residue and reduces it into a solidified slag material 38. The solidified slag aggregate is a highly salable item due to its silica and metallic content. A ridge of molded refractory material 34 adjacent lip 16 further enhances combustion and further degradation of the molten refuse by increasing the surface area over which the refuse is exposed to oxidation. The action of the water seal with the molten refuse serves to generate additional steam. A turbine generator 35, for example, may receive the hot gases entering gas vent 32 and be used to generate more electrical power than is consumed by the torches. Appropriate gas treatment means (not shown) receive and scrub the combusted gases until safe for release to atmosphere. Alternately, selected valuable gases, e.g., methane, may be separated by well-known means before being combusted by withdrawing a portion of the gas by appropriate means (not shown). The now solidified slag 38 may be handled by appropriate blade or other suitable conveyor means 60 and finally withdrawn from the water bath by additional handling apparatus 61 for later use.

Referring to FIG. 2, a long arc column plasma torch, according to the invention and as previously taught in US. Pat. No. 3,673,375, is defined as being an apparatus and an electrical conductor in the arc circuit and includes a cylindrical shaped electrode 36, a gas directing nozzle 37 axially aligned with, forwardly spaced and insulated from electrode 36, and appropriate gas and electrical supply means (not shown). As previously disclosed in copending application, Ser. No. 283,552 a pilot are indicated by dashed lines 45, may be struck between electrode 36 and nozzle 37 by introducing a current potential therebetween while simultaneously applying a vortical flow of gas directed outward through said nozzle 37. Such a pilot arc is readily trans ferred to a metallic material 46 also in the electrical circuit when such pilot are 45 becomes proximate said metallic matter (i.e., 4-7 inches) by appropriately advancing said torch 12 into a position proximate said metallic refuse 46. In the instant invention, it has been recognized that such a long are column plasma torch has particular effectiveness in a refuse converting apparatus since one component (typically 25 percent) of refuse is metal.

Referring now to FIG. 3, a first long arc column plasma torch 40, in preferred form, is adapted to extend through an aperture 47 in a portion of a rear wall 51 of said furnace chamber 15 while second 41 and third 42 long are column plasma torches are adapted to extend through apertures 48, 49 in adjacent corner wall portions 52 of said furnance chamber. As is perhaps apparent, many other torch mounting configurations will appear to those skilled in the art, and the particular mounting details described herein are for purposes of example only. A sleeve or collar 53 (FIG. 2) which may be stainless steel, for example, lining each respective aperture 47, 48, 49 is adapted to enable horizontal and vertical angular, as well as axial, movement of each plasma torch within its respective mounting position while preventing heat and noxious gases from escaping through apertures 47, 48, 49. Remotely controllable torch positioning means 24 (FIG. 1) are provided to enable accurate positioning of the plasma torches.

Referring now to FIG. 4, 'as previously mentioned, each long arccolumn forming plasma torch utilized in the present invention (shown in cross section) includes a cylindrical shaped internal electrode 36 and a gas directing nozzle 37 axially aligned with, forwardly spaced and insulated from electrode and appropriate gas, water and electrical supply means (not shown). while the last mentioned gas and water supply means areconsidered well-establishedin the art requiring no further elaboration herein, a better understanding may be gained of the invention by a discussion'of its advantageous use of power in starting and maintaining the various long arc plasma columns. Utilizing a three phase A. C. wye 55 having a floating neutral 56 to conveniently supply power to three long arc column forming plasma torches 12, a given torch internal electrode 36 is connected to an individual current phase. It is apparent that if more than three torches are employed, a greater number of phases may be utilized. Each torch nozzle 37 is connected to an adjacent phase 58 via an appropriate .choke 59. In this manner, apilot arc 45 may be struck between the nozzle 37 and internal electrode 36 of each torch without introducing a consumable electrical conductor by applying the phase to adjacent phase voltage differential, caused byvchoke 59, across internal electrode 36 and nozzle 37 and by simultaneously introducing a gas vortical flow through nozzle 37. The current passing through the pilot arc 45- is substantially smaller than that of the main arc 13 (see FIGS. 1 and 2) which is subsequently adapted to be transferred to the metal scrap to be melted. Simultaneous transferral of at least two pilot arcs 45 to the metallic refuse component establishes at least two main transferred arcs (not shown) and completes a phase 57 to adjacent phase 58 loop whereby the full available current is now utilized.

Since the nature and physical arrangement of the refuse with respect to the torches willvary widely during operation it is contemplated that one or more torches may become inoperable. For example, a falling porcelain coated refrigerator or a sudden deluge of rotten vegetables may stifle an are. In this event, any single torch may be operated phase to neutral and a new plasma column path may be established by restarting with a pilot arc. Thus, when contact with an electrically conductive melt or an electrically conductive unmelted refuse is lost to a particular plasma column connection may be made to graphite electrode 18 to a ground or neutral 79 (FIG. 1) by a suitable manual or remotely operated contactor 78. Once a molten metallic pool is reestablished the other torches may be again utilized.

Once a molten pool 19 of metallic refuse has been formed and preferably all long arc plasma columns 13 have made electrical contact with said molten pool, it is possible to then continuously dump unsegregated refuse 25 into the furnace chamber 15. The small molten metallic component of the unsegregated refuse will then be sufficient to sustain electrical connection between the three plasma arcs. Furthermore, the above described method of operating long are column plasma torches in electrical connection with a molten pool of metallic refuse 19 assures continuous operation of the furnace since the metal having a higher specific gravity than the bulk of other refuse will tend to remain. in the concave refractory lined hearth 17 while the continuously melting mixed metallic-non-metallic refuse will tend to flow out of the concave furnace hearth. 17, pass the outlet lip 16 through oxidation chamber 30and into water bath 33. It is also a recognized. advantage of the particular embodiment shown to utilize the hot gases being evolved in the furnace chamber to pre-heat refuse materials 25 entering the furnace thereby promoting even greater efficiences. Based on the foregoing invention operation parameters, the specific furnace design and construction is deemed well within the established electric arc furnace art and therefore requires no further elaboration here. While specific refuse conveying means, material handling and energy recovery means have been suggested, these aspects of the instant invention are also well-known in the established art. A- complete but not definitive method of converting refuse into usable energy recoverable products based on the described invention may include:

a. initially charging a furnace built in accordance with the invention with refuse having a high metallic content;

b. initiating and sustaining a plurality of long are plasma columns and reducing the largely metallic refuse to a molten pool;

c. conveying refuse of any class or mixture into the furnace;

d. reducing by heat pyrolysis the physical weight and volume of said conveyed refuse into molten fluid and gaseous products;

e. converting the evolved molten fluid and gaseous products to usable energy;

f. treating and purifying the final products before returning them to the atmosphere.

On the basis of the foregoing description, it is apparent that the instant invention provides an efficient and environmentally safe alternative to landfill, and combustive incineration practices of refuse disposal while at the same time providing a source for energy through the use of long are column forming plasma torches. According to the invention, it is now possible to continuously decrease the physical weight and volume of raw unsegregated refuse while converting the evolved products to useful materials and useful energy.

What is claimed is:

1. An apparatus for reducing by pyrolysis raw unsegregated refuse comprising:

a. a furnace chamber;

b. a refractory lined hearth in said furnace chamber;

c. conveyor means adapted to introduce raw unsegregated refuse, at least a portion of which is metallic, into said furnace chamber; and

d. long arc column forming plasma generator means mounted in said chamber and adapted to initiate and sustain at least one long arc column plasma having a portion thereof in electrical contact with said refuse and being adapted to reduce said refuse to gaseous and molten fluid products by utilization of the column heat.

2. The apparatus of claim 1 including gas supply means adapted to contact and chemically react with said gaseous and molten fluid products.

3. The apparatus of claim 2 including energy conversion means adapted to recover energy from said products.

4. The apparatus of claim 2 wherein said gas supply means comprises an oxidizing supply.

5. The apparatus of claim 1 wherein said generator means comprises a plurality of peripherally spacedgenerators and including electrical circuit means adapted to initiate a pilot arc in each said generator and enabling a main long are column to be transferred between at least two said generators and said refuse.

6. The apparatus of claim 1 including groundable electrode means included in said hearth and being adapted to enable a long are plasma column to be generated between at least one said generator and said grounded electrode.

7. A method for reducing by pyrolysis a volume of raw unsegregated refuse comprising:

a. initially charging a furnace chamber with refuse materials of which a substantial portion is metallic;

b. providing long plasma arc column generation means extending through at least one wall portionof said furnace chamber;

c. establishing and maintaining at least one long plasma arc column between said generation means and said refuse thereby reducing by heat at least said metallic refuse portion to amolten state;

d. conveying additional raw unsegregated refuse into said furnace chamber; and

e. pyrolyzing all of said raw unsegregated refuse by heat from said long plasma arc column into molten and gaseous products.

8. The method of claim 7 including chemically reacting a selected gas with said molten and gaseous products.

9. The method of claim 8 wherein said gas comprises an oxidizing gas.

10. The method of claim 7 including the step of recovering energy from said products.

5 3 i UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3, 779,13?- Dated December 18, 1973 InventorGQ Salvador L. Camacho It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 66, a parenthesis mark should be inserted before "95 percent".

Column 4, line 8, "an oxidation" should be deleted before "dioside" and -carbon should be inserted.

Signed and sealed this 17th day of December 1974.

(SEAL) Attest':

McCOY M. GIBSON JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3173388 *Oct 8, 1962Mar 16, 1965Ernest J LideenCarbon arc incinerator
US3290552 *Apr 21, 1964Dec 6, 1966Giannini Scient CorpApparatus for generating high-intensity light with high temperature particulate material
US3404078 *May 25, 1965Oct 1, 1968Battelle Development CorpMethod of generating a plasma arc with a fluidized bed as one electrode
US3503347 *May 26, 1967Mar 31, 1970Electrode Incinerators IncMethod and electrical arc apparatus for incinerating trash and garbage
US3537410 *Sep 20, 1968Nov 3, 1970Hagan Ind IncIncinerator with residue reduction
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3944412 *Sep 18, 1974Mar 16, 1976Hsin LiuMethod for recovering metals
US4141694 *Dec 27, 1977Feb 27, 1979Technology Application Services CorporationApparatus for the gasification of carbonaceous matter by plasma arc pyrolysis
US4181504 *Aug 26, 1977Jan 1, 1980Technology Application Services Corp.Method for the gasification of carbonaceous matter by plasma arc pyrolysis
US4217479 *Apr 6, 1978Aug 12, 1980Swiss Aluminium Ltd.High temperature reactor
US4220843 *Sep 27, 1978Sep 2, 1980Swiss Aluminium Ltd.Process for melting material
US4326842 *Jan 24, 1980Apr 27, 1982Daidotokushuko KabushikikaishaDevice for the pulverization of radioactive wastes
US4432942 *Oct 13, 1981Feb 21, 1984Toshio AdachiMelting with plasma torch, then storage
US4466807 *Nov 25, 1981Aug 21, 1984Skf Steel Engineering AktiebolagHeating with oxidizer and slag former
US4626654 *Sep 29, 1982Dec 2, 1986Veb Edelstahlwerk "8 Mai 1945" FreitalMetallurgical plasma melting process
US4734551 *Jan 10, 1986Mar 29, 1988Plasma Energy CorporationMethod and apparatus for heating molten steel utilizing a plasma arc torch
US4770109 *May 4, 1987Sep 13, 1988Retech, Inc.Apparatus and method for high temperature disposal of hazardous waste materials
US4861001 *Jul 21, 1987Aug 29, 1989Retech, Inc.Melting retort and method of melting materials
US4918282 *Oct 23, 1987Apr 17, 1990Plasma Energy CorporationMethod and apparatus for heating molten steel utilizing a plasma arc torch
US5005494 *Aug 16, 1989Apr 9, 1991Retech, Inc.Apparatus and method for high temperature disposal of hazardous waste materials
US5143000 *May 13, 1991Sep 1, 1992Plasma Energy CorporationRefuse converting apparatus using a plasma torch
US5224118 *Jul 27, 1992Jun 29, 1993Murry VanceOn-site, biohazardous waste disposal system
US5333146 *Jun 28, 1993Jul 26, 1994Murry VanceOn-site, biohazardous waste disposal system
US5405429 *May 12, 1993Apr 11, 1995Holderbank Financiere Glarus, AgMethod for treatment and conversion of refuse incineration residues into environmentally acceptable and reusable material, especially for construction purposes
US5408494 *Jul 28, 1993Apr 18, 1995Retech, Inc.Material melting and incinerating reactor with improved cooling and electrical conduction
US5451738 *May 25, 1993Sep 19, 1995Itex Enterprises Services, Inc.Plasma arc decomposition of hazardous wastes into vitrified solids and non-hazardous gasses
US5534659 *Apr 18, 1994Jul 9, 1996Plasma Energy Applied Technology IncorporatedApparatus and method for treating hazardous waste
US5666891 *Feb 2, 1995Sep 16, 1997Battelle Memorial InstituteWaste conversion unit
US5675056 *Mar 9, 1995Oct 7, 1997Vance; Murray A.Incandescent waste disposal system and method
US5756957 *Mar 25, 1996May 26, 1998Integrated Environmental Technologies, LlcTunable molten oxide pool assisted plasma-melter vitrification systems
US5798497 *Jun 19, 1995Aug 25, 1998Battelle Memorial InstituteTunable, self-powered integrated arc plasma-melter vitrification system for waste treatment and resource recovery
US5811752 *Mar 25, 1996Sep 22, 1998Integrated Environmental Technologies, LlcEnhanced tunable plasma-melter vitrification systems
US5833933 *Oct 1, 1997Nov 10, 1998Vance; Murry A.Wastes are thermally and mechanically decomposed using rollers and unrestricted arc plasma cloud
US5908564 *Aug 14, 1997Jun 1, 1999Battelle Memorial InstituteTunable, self-powered arc plasma-melter electro conversion system for waste treatment and resource recovery
US6018471 *Mar 16, 1998Jan 25, 2000Integrated Environmental TechnologiesMethods and apparatus for treating waste
US6037560 *Sep 22, 1998Mar 14, 2000Integrated Environmental Technologies, LlcEnhanced tunable plasma-melter vitrification systems
US6066825 *Dec 8, 1998May 23, 2000Integrated Environmental Technologies, LlcMethods and apparatus for low NOx emissions during the production of electricity from waste treatment systems
US6127645 *Aug 24, 1998Oct 3, 2000Battelle Memorial InstituteTunable, self-powered arc plasma-melter electro conversion system for waste treatment and resource recovery
US6160238 *May 21, 1998Dec 12, 2000Integrated Environmental Technologies, Inc.Tunable molten oxide pool assisted plasma-melter vitrification systems
US6215678Sep 9, 1999Apr 10, 2001Integrated Environmental Technologies, LlcArc plasma-joule heated melter system for waste treatment and resource recovery
US6514469Sep 22, 2000Feb 4, 2003Yuji KadoWithstand shock, vibration and stresses
US6551563Sep 22, 2000Apr 22, 2003Vanguard Research, Inc.Methods and systems for safely processing hazardous waste
US6630113Sep 9, 1999Oct 7, 2003Integrated Environmental Technologies, LlcMethods and apparatus for treating waste
US6702991Nov 12, 2002Mar 9, 2004Arvin Technologies, Inc.Determining temperature of catalyst, selectively activating and deactivating based on temperature
US6715452Nov 13, 2002Apr 6, 2004Arvin Technologies, Inc.Method and apparatus for shutting down a fuel reformer
US6758035Sep 18, 2002Jul 6, 2004Arvin Technologies, Inc.Method and apparatus for purging SOX from a NOX trap
US6843054Jan 16, 2003Jan 18, 2005Arvin Technologies, Inc.Method and apparatus for removing NOx and soot from engine exhaust gas
US6851398Feb 13, 2003Feb 8, 2005Arvin Technologies, Inc.Method and apparatus for controlling a fuel reformer by use of existing vehicle control signals
US6959542Jul 28, 2003Nov 1, 2005Arvin Technologies, Inc.diesel particulate-nitrogen oxides reduction; operation of heating and air conditioning systems of on-highway trucks without requiring concurrent operation of engine; increased number and type of treatable compounds; single assembly
US6971323Apr 8, 2004Dec 6, 2005Peat International, Inc.Method and apparatus for treating waste
US6976353Sep 18, 2002Dec 20, 2005Arvin Technologies, Inc.Apparatus and method for operating a fuel reformer to provide reformate gas to both a fuel cell and an emission abatement device
US7021048Sep 18, 2002Apr 4, 2006Arvin Technologies, Inc.Combination emission abatement assembly and method of operating the same
US7216593Nov 12, 2005May 15, 2007Peat International, Inc.Apparatus for treating liquid waste
US7244281Oct 24, 2003Jul 17, 2007Arvin Technologies, Inc.Air/fuel input assembly, an electrode assembly, and a soot trap positioned downstream; reformer controller electrically coupled to the air/fuel input assembly; reformer controller generates a purge-soot signal operating the air/fuel input assembly
US7285247Oct 24, 2003Oct 23, 2007Arvin Technologies, Inc.Advancing aN air/fuel mixture into fuel reformer;determining if soot purge is to be performed and generating a purge-soot signal in response; and advancing a second air/fuel mixture with greater air-to-fuel ratio; combustion
US7698887Jun 17, 2005Apr 20, 2010Emcon Technologies LlcMethod and apparatus for determining local emissions loading of emissions trap
US7776280May 10, 2005Aug 17, 2010Emcon Technologies LlcMethod and apparatus for selective catalytic reduction of NOx
US7832344Jun 1, 2006Nov 16, 2010Peat International, Inc.Method and apparatus of treating waste
US8156876Jun 23, 2006Apr 17, 2012Georgia Tech Research CorporationSystems and methods for integrated plasma processing of waste
US8252244Feb 3, 2009Aug 28, 2012Peat International, Inc.Method and apparatus of treating waste
US8306665May 7, 2007Nov 6, 2012Plasco Energy Group Inc.Control system for the conversion of carbonaceous feedstock into gas
US8307770Mar 12, 2007Nov 13, 2012Pyropure LimitedWaste treatment apparatus and method
US8372169May 7, 2007Feb 12, 2013Plasco Energy Group Inc.Low temperature gasification facility with a horizontally oriented gasifier
US8435315May 7, 2007May 7, 2013Plasco Energy Group Inc.Horizontally-oriented gasifier with lateral transfer system
US8671855Jun 29, 2010Mar 18, 2014Peat International, Inc.Apparatus for treating waste
US8690975Feb 27, 2008Apr 8, 2014Plasco Energy Group Inc.Gasification system with processed feedstock/char conversion and gas reformulation
CN1754066BFeb 10, 2004Feb 2, 2011普拉斯科能源Ip控股公司毕尔巴鄂-沙夫豪森分公司Multiple plasma generator hazardous waste processing system
DE3002695A1 *Jan 25, 1980Aug 7, 1980Daido Steel Co LtdVerfahren zum fuellen eines lagerungs- faehigen behaelters mit festem radioaktivem abfall
DE3002696A1 *Jan 25, 1980Aug 7, 1980Daido Steel Co LtdVorrichtung zum feinzerkleinern radioaktiven abfalls
EP0290974A1 *May 6, 1988Nov 17, 1988Fried. Krupp Gesellschaft mit beschränkter HaftungThermal treatment of solid scrap containing heavy metal compounds and/or toxic hydrocarbons
EP0572769A2 *Mar 18, 1993Dec 8, 1993Holderbank Financiere Glarus AgProcess for the conversion of waste incineration residues to a non-polluting product and useful for constructional purposes
EP0595968A1 *Jul 16, 1992May 11, 1994BURGESS, Donald A.Plasma disintegration for waste material
EP0959049A1 *May 22, 1998Nov 24, 1999DBI DEUTSCHES BRENNSTOFFINSTITUT ROHSTOFF & ANLAGENTECHNIK GmbHMethod and apparatus for thermal transforming of waste
EP1533567A1 *Nov 18, 2003May 25, 2005Zwilag Zwischenlager Würenlingen AGFurnace with rotating hearth for dangerous wastes
WO1994003029A1 *Jul 26, 1993Feb 3, 1994Vance I D S IncOn-site, biohazardous waste disposal system
WO1996024441A2 *Feb 2, 1996Aug 15, 1996Battelle Memorial InstituteTunable, self-powered integrated arc plasma-melter vitrification system for waste treatment and resource recovery
WO2004072547A1 *Feb 10, 2004Aug 26, 2004Rcl Plasma IncMultiple plasma generator hazardous waste processing system
WO2005052448A1 *Jul 3, 2004Jun 9, 2005Robert IneichenRotating hearth furnace for waste with a hazard potential
Classifications
U.S. Classification110/234, 110/243, 219/75, 219/121.11, 110/250
International ClassificationC02F11/10, C10B19/00, F23G5/00, C03B5/00, C03B5/02, C10B53/00, F23G5/08, B01J6/00, C10J3/08, F23J1/00
Cooperative ClassificationF23G2204/201, C10B19/00, C03B5/025, C10B53/00, C03B5/005, Y02E50/30, F23G5/085
European ClassificationC10B19/00, C10B53/00, C03B5/02D, F23G5/08C, C03B5/00B
Legal Events
DateCodeEventDescription
Mar 3, 1983AS02Assignment of assignor's interest
Owner name: PLASMA ENERGY CORPORATION, RTE. 8, BOX 114-Z, UMST
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION
Effective date: 19830222
Mar 3, 1983ASAssignment
Owner name: PLASMA ENERGY CORPORATION, RTE. 8, BOX 114-Z, UMST
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TECHNOLOGY APPLICATION SERVICES CORPORATION;REEL/FRAME:004103/0965
Effective date: 19830222
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION RALEIG
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:B.B. OLIVE;REEL/FRAME:004099/0276
Effective date: 19830223
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION, RALEI
Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:PLASMA GAS DEVELOPMENT CORPORATION A GA CORP.;REEL/FRAME:004099/0278
Mar 3, 1983AS17Release by secured party
Owner name: PLASMA GAS DEVELOPMENT CORPORATION A GA CORP.
Effective date: 19830222
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION, RALEI
Dec 6, 1982AS02Assignment of assignor's interest
Owner name: CAMACHO, SALVADOR L.
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION ROUTE
Effective date: 19821202
Dec 6, 1982ASAssignment
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION ROUTE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:CAMACHO, SALVADOR L.;REEL/FRAME:004066/0920
Effective date: 19821202
Nov 15, 1982ASAssignment
Owner name: PLASMA GAS DEVELOPMENT CORPORATION
Free format text: SECURITY INTEREST;ASSIGNOR:TECHNOLOGY APPLICATION SERVICES CORPORATION A NC CORP.;REEL/FRAME:004062/0339
Effective date: 19770114
Owner name: PLASMA GAS DEVELOPMENT CORPORATION, STATELESS
Nov 15, 1982AS06Security interest
Owner name: PLASMA GAS DEVELOPMENT CORPORATION
Effective date: 19770114
Owner name: TECHNOLOGY APPLICATION SERVICES CORPORATION A NC C