US3837303A - Wood and gas fuel burner - Google Patents

Wood and gas fuel burner Download PDF

Info

Publication number
US3837303A
US3837303A US00414508A US41450873A US3837303A US 3837303 A US3837303 A US 3837303A US 00414508 A US00414508 A US 00414508A US 41450873 A US41450873 A US 41450873A US 3837303 A US3837303 A US 3837303A
Authority
US
United States
Prior art keywords
burner
chamber
wood
air
fuel
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.)
Expired - Lifetime
Application number
US00414508A
Other languages
English (en)
Inventor
A Baardson
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.)
Mill Conversion Contractors
ROBBINS EH
Original Assignee
Mill Conversion Contractors
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 Mill Conversion Contractors filed Critical Mill Conversion Contractors
Priority to US00414508A priority Critical patent/US3837303A/en
Priority to JP49020341A priority patent/JPS5078931A/ja
Application granted granted Critical
Publication of US3837303A publication Critical patent/US3837303A/en
Assigned to BAARDSON, ANDREW B., reassignment BAARDSON, ANDREW B., ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BUTTS, ROBERT, TRUSTEE FOR MILL CONVERSION CONTRACTOR. INC., BANKRUPT.
Assigned to ROBBINS, E.H. reassignment ROBBINS, E.H. ASSIGNMENT OF 1/2 OF ASSIGNORS INTEREST Assignors: BAARDSON, ANDREW B.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F23G5/32—Incineration of waste; Incinerator constructions; Details, accessories or control therefor the waste being subjected to a whirling movement, e.g. cyclonic incinerators
    • 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
    • F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
    • F23G7/105—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses of wood waste

Definitions

  • ABSTRACT The present invention provides a burner by means of which waste wood and the fumes emitted by drying wood can effectively be burned to not only provide additional heat energy but also to reduce atmospheric pollution.
  • the burner basically comprises two chambers. The wood, fed in powdery form, is burned in the first chamber, the product of this combustion being passed to the second chamber where it is mixed with the fumes before being combusted a second time. A number of innovations makes this burner highly effective and useful in the lumber mill industry.
  • the present invention relates to the lumber mill field in general and more particularly relates to a wood and gas fuel bumer for the effective utilization of wood waste materials and other by-products of the lumber mill industry.
  • Lumber mills generate tons of waste wood daily and not all of it can be used for barkdust, chipboard or other commercial products. More particularly, in the manufacture and processing of lumber and lumber mill products,v arious kinds of wood materials are developed with which little can be done and which are therefore looked upon and treated as waste. For example, in a plywood mill, the surface of the plywood is finished by sanding the plywood and, as a result thereof, there is produced a sander dust that is difficult to handle because it is stringy, ballsup, has'a tendency to bridge, is difficult to measure quantitatively, presents a fire and explosion hazard, and is generally a nuisanceto handle.
  • the present invention provides a burner by means of which the waste wood and the fumes can effectively be burned to not only provide additional heat energybut also to reduce atmospheric pollution.
  • the burner basically comprises two chambers. The wood, fed in powdery form, is burned'in the first chamber, the product of this combustion'being passed to the second chamber where it is mixed with the fumes before being combusted a second time.
  • the result is a pollutant-free hot gas that can be used as a heat source either to dry wood or to produce steam in a boiler system.
  • an object of the present invention to provide a burner in which both wood and gaseous emissions can efficiently be burned.
  • FIG. 1 is a cross-sectional view of a burner according to the present invention and illustrates the two chambers therein wherein the wood and combustible gases are respectively burned;
  • FIG. 2 is a front view of one of the elements included in the construction of the FIG. 1 embodiment
  • FIG. 3 is a side view, partially in cross-section, of certain wood fuel supply and dispersion apparatus included in a burner according to the present invention.
  • FIG. 3(a) is an end view of the FIG. 3 apparatus.
  • the burner is a twostage structure in which a combustion chamber 10 constitutes the first stage and a blending chamber 11 the second stage.
  • the burner is cylindricalIy-shaped and generally symetrical about its center line, the two chambers being lined with a refractory material, such as high alumina firebrick 12 lining the combustion chamber and castable fireclay 13 around the blending chamber.
  • a product deflector unit comprising a burner tube 15 that is coupled at its input end to a burner fan 16 and at its output end to the chamber 17 in which the combustion of the wood fuel isinitiated.
  • the burner tube is cylindrically-shapedand has a series of dispersion vanes 18 mounted peripherally around the inside of the tube near its input end, the dispersion vanes being positioned at such an angle that the combination of combustion air and wood fuel held,
  • dispersion vanes 18 are located at the input end of the burner tube.
  • deflector apparatus At the output end of the burner tube and extending partially into chamber 17 is deflector apparatus, generally designated 20, that comprises a nosecone section 21 at its forward end and a conical deflector section 22 at its rearward end, the two conical sections being separated by a pair of concentric pipe sections 23 and 24 respectively used for housing and support purposes.
  • a support base 25 Mounted within pipe 23 and abutting against nonecone section 21 is a support base 25, a bolt 26 extending through this support base and the nosecone section as shown in FIG. 3.
  • a jamb nut 27 is tightly wound on the bolt so as to firmly or rigidly hold the nosecone section in place between the support base and the nut.
  • brackets 28 which are mounted between pipe 23 and the wall of burner tube 15, as is best shown in FIG. 3.
  • brackets 28 centrally fix the position of pipes 23 and 24 inside the burner tube and the pipes, in turn, aid in holding cone sections 21 and 22 in position.
  • a backing plate 30 is mounted on and covers the base of conical section 22, the junction between the plate and the conical section being filled in to form an annular concave-shaped fillet 31 that provides a smooth transition from the surface of the conical section to that of the plate.
  • fillet 31 plays an important role in the process of deflecting the wood fuel product as it passes through the burner tube on the way to the combustion chamber.
  • a deflector ring 32 that is held in position by the wall of burner tube at the junction of conical section 22 and pipe 23, the ring being tapered or angled along its inside surfact 32a so as to deflect gases and wood fuel passing through it toward conical section 22.
  • the entrance to combustion chamber 17 includes an entrance port 33 through which product deflector unit 14 extends toward the combustion chamber and at the input end of which there is mounted a gas ring burner 34.
  • the gas ring burner is illustrated in both FIGS. 1 and 2 and, as shown therein, is hollow, has openings or orifices 34a along its entire circular inner surface or periphery, and, by means of pipe'34b is connected to a natural gas or propane source (not shown).
  • the opening or passageway through the center of gas burner ring 34, the opening being designated 34c is approximately the same size or diameter as that of entrance port 33 to which it is adjacent. Accordingly, any gases flowing through ring opening 34c thereafter flow smoothly into entrance port 33.
  • the significance of gas burner ring 34 will be pointed out hereinbelow.
  • chamber 17 is enclosed by a wall of firebrick 12. However, between the firebrick and the outer wall of the burner, which is also the outer wall of combustion chamber 10, the said outer wall being designated 35, in a passageway 36 that is connected to a combustion air fan 37 by means of duct 38.
  • a combustion air fan 37 in combustion chamber 10, in a concentric arrangement, is chamber 17, firebrick wall 12, passageway 36 and outer burner wall 35.
  • the air provided by air fan 37 flows through passageway 36 in the direction of the arrows therein and thereafter passes through gas burner ring 34 and entrance port 33 into chamber 17.
  • helical vortex type of flow pattern having a counterclockwise movement or rotation.
  • Exit port 41 leads to blending chamber 11 and the products of combustion leaving chamber 17 pass through port 41 on their way to the blending chamber.
  • Blending chamber 11 is similar to combustion chamber 10 in several respects in that it also includes a chamber 42 formed by a wall of refractory material 13 and with entrance and exit ports 43 and 44, respectively, at its input and output ends.
  • the blending chamber and what goes on inside it constitutes the second stage of the burner and, in this regard, it is therefore coupled to the combustion chamber by means of entrance port 43 which, as the figure illustrates, is in communications with exit port 41.
  • a return vent fan 45 which, as previously indicated, feeds the combustible gases from the dryer to chamber 42.
  • dispersion vanes 18 cause the wood fuel to become evenly dispersed in the air that carries them so as to provide a uniform cross-sectional wood particle density.
  • the air and wood particles still in a counterclockwise rotational movement, move along or follow the surface of the conical section until they reach backing plate 30 and fillet 31 where the entire mass of air and wood fuel is smoothly channeled or turned outwardly toward wall 12 in chamber 17.
  • the wood particles are ignited due to the high temperature at the walls surface, which temperature may be in the range between 2,200-2,400 Fahrenheit.
  • the wood particles are deflected by the wall of chamber 17 and they then move into and through the chamber as they continue and complete the combustion process. During this period of time, the wood continues to move in a helical path toward exit port 41.
  • said first means includes a deflector unit whose input end is coupled to receive the stream of air with the wood fuel suspended therein and whose output end is coupled to said first chamber, said deflector unit including a plurality of dispersion vanes mounted at its input end and positioned at such an angle as to cause said air and wood fuel to move in a counter-clockwise manner as it flows therethrough toward the output end of said deflector unit, said deflector unit further including deflector apparatus mounted at its output end to deflect said air and wood fuel outwardly toward the walls of said first chamber.
  • said deflector apparatus includes first and second conical sections at its forward and rearward ends, respectively, the base of said rearward conical section including structure to smoothly divert said air-suspended wood fuel radially outwardly toward the walls of said first chamber; and wherein said deflector apparatus further includes a deflector ring whose inside surface is angled to deflect any air-suspended wood fuel coming into contact with it toward said rearward conical section.
  • said deflector unit includes a cylindrically-shaped burner tube at whose input end said dispersion vanes are mounted and at whose output end said deflector apparatus is mounted, said dispersion vanes being distributed in a circular mode along the periphery of said burner tube and oriented at such an angle that the stream of air with the wood fuel suspended therein passing by the vanes are deflected by them into a counterclockwise rotational movement.
  • said burner further includes a supplementary air supply arrangement to provide additional air for combustion in said first chamber, said arrangement including a channel extending outside the wall of said first chamber and leading to the input end thereof.
  • said deflector unit includes a cylindrically-shaped burner tube at whose input end said dispersion vanes are mounted and at whose output end said deflector apparatus is mounted, said dispersion vanes being distributed in a circular mode along the periphery of said burner tube and oriented at such an angle that the stream of air with the wood fuel suspended therein passing by the vanes are deflected by them into a counterclockwise rotational movement.
  • said burner defined in claim 5 wherein said first chamber is cylindrically-shaped and wherein said sixth means includes a plurality of orifices through the wall of said first chamber that are located in a generally helical path therealong, said orifices intercoupling said supplementary air channel with said first chamber.
  • said first chamber is cylindrically-shaped and wherein said sixth means includes a plurality of orifices through the wall of said first chamber that are located in a generally heliburner tube concentrically extends, said gas ring burner being hollow, having orifices along its periphery, and having means for coupling it to a source of fuel.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Gasification And Melting Of Waste (AREA)
  • Incineration Of Waste (AREA)
US00414508A 1973-11-09 1973-11-09 Wood and gas fuel burner Expired - Lifetime US3837303A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US00414508A US3837303A (en) 1973-11-09 1973-11-09 Wood and gas fuel burner
JP49020341A JPS5078931A (enrdf_load_stackoverflow) 1973-11-09 1974-02-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00414508A US3837303A (en) 1973-11-09 1973-11-09 Wood and gas fuel burner

Publications (1)

Publication Number Publication Date
US3837303A true US3837303A (en) 1974-09-24

Family

ID=23641754

Family Applications (1)

Application Number Title Priority Date Filing Date
US00414508A Expired - Lifetime US3837303A (en) 1973-11-09 1973-11-09 Wood and gas fuel burner

Country Status (2)

Country Link
US (1) US3837303A (enrdf_load_stackoverflow)
JP (1) JPS5078931A (enrdf_load_stackoverflow)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940253A (en) * 1973-12-07 1976-02-24 Volvo Flygmotor Aktiebolag Device for the purification of process waste gases
US4055401A (en) * 1975-01-14 1977-10-25 The Ralph M. Parsons Company Reducing gas generator
US4105397A (en) * 1977-01-10 1978-08-08 The United States Of America As Represented By The Secretary Of Agriculture Bark burning system
US4132180A (en) * 1975-07-31 1979-01-02 Fredrick William L Apparatus and method for enhancing combustibility of solid fuels
FR2394752A1 (fr) * 1977-06-17 1979-01-12 Grossniklaus Hans Appareil de chauffage a combustible solide
FR2414685A2 (fr) * 1978-03-24 1979-08-10 Tabel Rene Perfectionnements aux bruleurs pyrolytiques pour la combustion de dechets tels que ligneux
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
US4249509A (en) * 1978-03-09 1981-02-10 Vermont Castings, Inc. Wood burning apparatus having improved efficiency
FR2488678A1 (fr) * 1980-08-14 1982-02-19 Rockwell International Corp Procede et appareil de combustion pour diminuer sensiblement l'emission de composes de l'azote formes pendant la combustion
US4326382A (en) * 1980-10-24 1982-04-27 E. H. Robbins Power plant
WO1982003111A1 (en) * 1981-03-03 1982-09-16 Rockwell International Corp Combustion method and apparatus therefor
WO1982003261A1 (en) * 1981-03-17 1982-09-30 Inc Trw Fuel combustor
WO1983001672A1 (en) * 1981-10-30 1983-05-11 Heat Harvester Corp Automated wood combustion apparatus
US4422388A (en) * 1981-12-01 1983-12-27 Raskin Jean F Wood and other solid register burner
EP0143510A1 (en) * 1983-08-08 1985-06-05 Inc. Aqua-Chem Bio-mass suspension burner
US4538530A (en) * 1979-12-31 1985-09-03 Whitman John E Burner for the suspension firing of comminuted material
US4546710A (en) * 1981-10-20 1985-10-15 Euronom Ab Burner head
US4553285A (en) * 1984-07-18 1985-11-19 Sachs Kerry M Plug furnace
US4566393A (en) * 1984-02-15 1986-01-28 Connell Ralph M Wood-waste burner system
WO1987000604A1 (en) * 1985-07-18 1987-01-29 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
WO1987001432A1 (en) * 1985-09-04 1987-03-12 Power Generating, Inc. Pressurized cyclonic combustion method and burner for particulate solid fuels
US4850288A (en) * 1984-06-29 1989-07-25 Power Generating, Inc. Pressurized cyclonic combustion method and burner for particulate solid fuels
WO1989007736A1 (en) * 1988-02-18 1989-08-24 Saarbergwerke Aktiengesellschaft Process and device for incinerating refuse
US4911088A (en) * 1989-05-11 1990-03-27 Mcconnell Industries, Inc. Ash reduction chamber and method of utilizing same
US6152054A (en) * 1997-07-22 2000-11-28 Ge Energy And Environmental Research Corp. Method and system for the disposal of coal preparation plant waste coal through slurry co-firing in cyclone-fired boilers to effect a reduction in nitrogen oxide emissions
US20060225424A1 (en) * 2005-04-12 2006-10-12 Zilkha Biomass Energy Llc Integrated Biomass Energy System
RU2636596C1 (ru) * 2017-01-09 2017-11-24 Владимир Ильич Матюхин Способ отопления шахтных агрегатов

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54161683A (en) * 1978-06-09 1979-12-21 Nobuyoshi Michishita Dehydrating and drying apparatus for regenerating and reusing waste plastics
US4512267A (en) * 1984-01-24 1985-04-23 John Zink Company Methods and apparatus for combusting ash producing solids
JPS6213326U (enrdf_load_stackoverflow) * 1985-07-03 1987-01-27

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1504528A (en) * 1922-10-07 1924-08-12 Chris L Strandrud Steam-fuel feeder
US3675600A (en) * 1971-01-21 1972-07-11 Michel Lumber Co Recirculating dryer system
US3716000A (en) * 1970-09-18 1973-02-13 Rees Memphis Inc Burner device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1504528A (en) * 1922-10-07 1924-08-12 Chris L Strandrud Steam-fuel feeder
US3716000A (en) * 1970-09-18 1973-02-13 Rees Memphis Inc Burner device
US3675600A (en) * 1971-01-21 1972-07-11 Michel Lumber Co Recirculating dryer system

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3940253A (en) * 1973-12-07 1976-02-24 Volvo Flygmotor Aktiebolag Device for the purification of process waste gases
US4055401A (en) * 1975-01-14 1977-10-25 The Ralph M. Parsons Company Reducing gas generator
US4132180A (en) * 1975-07-31 1979-01-02 Fredrick William L Apparatus and method for enhancing combustibility of solid fuels
US4105397A (en) * 1977-01-10 1978-08-08 The United States Of America As Represented By The Secretary Of Agriculture Bark burning system
FR2394752A1 (fr) * 1977-06-17 1979-01-12 Grossniklaus Hans Appareil de chauffage a combustible solide
US4249509A (en) * 1978-03-09 1981-02-10 Vermont Castings, Inc. Wood burning apparatus having improved efficiency
FR2414685A2 (fr) * 1978-03-24 1979-08-10 Tabel Rene Perfectionnements aux bruleurs pyrolytiques pour la combustion de dechets tels que ligneux
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
US4538530A (en) * 1979-12-31 1985-09-03 Whitman John E Burner for the suspension firing of comminuted material
FR2488678A1 (fr) * 1980-08-14 1982-02-19 Rockwell International Corp Procede et appareil de combustion pour diminuer sensiblement l'emission de composes de l'azote formes pendant la combustion
US4427362A (en) 1980-08-14 1984-01-24 Rockwell International Corporation Combustion method
US4326382A (en) * 1980-10-24 1982-04-27 E. H. Robbins Power plant
WO1982003111A1 (en) * 1981-03-03 1982-09-16 Rockwell International Corp Combustion method and apparatus therefor
WO1982003261A1 (en) * 1981-03-17 1982-09-30 Inc Trw Fuel combustor
US4546710A (en) * 1981-10-20 1985-10-15 Euronom Ab Burner head
WO1983001672A1 (en) * 1981-10-30 1983-05-11 Heat Harvester Corp Automated wood combustion apparatus
US4422388A (en) * 1981-12-01 1983-12-27 Raskin Jean F Wood and other solid register burner
EP0143510A1 (en) * 1983-08-08 1985-06-05 Inc. Aqua-Chem Bio-mass suspension burner
US4566393A (en) * 1984-02-15 1986-01-28 Connell Ralph M Wood-waste burner system
US4724780A (en) * 1984-06-29 1988-02-16 Power Generating, Inc. Pressurized cyclonic combustion method and burner for particulate solid fuels
US4850288A (en) * 1984-06-29 1989-07-25 Power Generating, Inc. Pressurized cyclonic combustion method and burner for particulate solid fuels
US4671192A (en) * 1984-06-29 1987-06-09 Power Generating, Inc. Pressurized cyclonic combustion method and burner for particulate solid fuels
US4553285A (en) * 1984-07-18 1985-11-19 Sachs Kerry M Plug furnace
WO1987000604A1 (en) * 1985-07-18 1987-01-29 Weyerhaeuser Company Suspension firing of hog fuel, other biomass or peat
WO1987001432A1 (en) * 1985-09-04 1987-03-12 Power Generating, Inc. Pressurized cyclonic combustion method and burner for particulate solid fuels
WO1989007736A1 (en) * 1988-02-18 1989-08-24 Saarbergwerke Aktiengesellschaft Process and device for incinerating refuse
US4911088A (en) * 1989-05-11 1990-03-27 Mcconnell Industries, Inc. Ash reduction chamber and method of utilizing same
US6152054A (en) * 1997-07-22 2000-11-28 Ge Energy And Environmental Research Corp. Method and system for the disposal of coal preparation plant waste coal through slurry co-firing in cyclone-fired boilers to effect a reduction in nitrogen oxide emissions
US20060225424A1 (en) * 2005-04-12 2006-10-12 Zilkha Biomass Energy Llc Integrated Biomass Energy System
US20110120140A1 (en) * 2005-04-12 2011-05-26 Zilkha Biomass Power Llc Integrated biomass energy system
US8240123B2 (en) 2005-04-12 2012-08-14 Zilkha Biomass Power Llc Integrated biomass energy system
RU2636596C1 (ru) * 2017-01-09 2017-11-24 Владимир Ильич Матюхин Способ отопления шахтных агрегатов

Also Published As

Publication number Publication date
JPS5078931A (enrdf_load_stackoverflow) 1975-06-27

Similar Documents

Publication Publication Date Title
US3837303A (en) Wood and gas fuel burner
US3831535A (en) Wood waste burner system
US3856455A (en) Method and apparatus for mixing and turbulating particulate fuel with air for subsequent combustion
US4351251A (en) Combustion apparatus
EP0887589B1 (en) Device and method for combustion of fuel
CZ20021480A3 (cs) Hořák na pevná paliva, spalovací zařízení, způsob spalování s pouľitím hořáku na pevná paliva a způsob provozu spalovacího zařízení
CA2177117C (en) Diffuser for coal nozzle burner
US4132180A (en) Apparatus and method for enhancing combustibility of solid fuels
US4177740A (en) Apparatus for generating heat from waste fuel
US3286666A (en) Combustion apparatus
ES496716A0 (es) Perfeccionamientos en quemadores de combustible pulverizado
US4147115A (en) Incinerator with gas generation
US4555994A (en) Boiler-heating assembly with oil- and coal-fired ignition burners
US5694868A (en) Furnace system with post combustion space
GB1433673A (en) Waste grease-burning apparatus
US5400525A (en) Flame cone for grain bin dryer
RU2196273C1 (ru) Циклонный предтопок
US4162890A (en) Combustion apparatus
SU1814714A3 (en) Swirl combustion chamber
GB2577565A (en) Combustion apparatus
EP0019962A1 (en) Method and burner for burning powdered fuel, and apparatus and method for drying moist material using such a burner
RU188443U1 (ru) Топка
US4515090A (en) Solid fuel burner
RU2013691C1 (ru) Циклонный предтопок котла
US4987840A (en) Incinerator with high combustion rate

Legal Events

Date Code Title Description
AS Assignment

Owner name: BAARDSON, ANDREW B.,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:BUTTS, ROBERT, TRUSTEE FOR MILL CONVERSION CONTRACTOR. INC., BANKRUPT.;REEL/FRAME:003991/0390

Effective date: 19750603

Owner name: ROBBINS, E.H. EUGENE, OREGON

Free format text: ASSIGNMENT OF 1/2 OF ASSIGNORS INTEREST;ASSIGNOR:BAARDSON, ANDREW B.;REEL/FRAME:003991/0395

Effective date: 19811230

STCF Information on status: patent grant

Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)