US2174663A - Tubular gas heater - Google Patents

Tubular gas heater Download PDF

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Publication number
US2174663A
US2174663A US216238A US21623838A US2174663A US 2174663 A US2174663 A US 2174663A US 216238 A US216238 A US 216238A US 21623838 A US21623838 A US 21623838A US 2174663 A US2174663 A US 2174663A
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gases
heating
heater
chamber
gas
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US216238A
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Keller Curt
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Aktiengesellschaft fuer Technische Studien
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Aktiengesellschaft fuer Technische Studien
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/08—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag
    • F28D7/082—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration
    • F28D7/085—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being otherwise bent, e.g. in a serpentine or zig-zag with serpentine or zig-zag configuration in the form of parallel conduits coupled by bent portions

Definitions

  • This invention relates to means for heating air and gases and more especially to gas heaters of the tubular type in which the heat energy of gases of combustion (flue gases) is utilized for the heating up of other gases or air. It is an object of this invention to provide means whereby the economy of such gas heaters is improved.
  • the present invention relates to a tubular gas heater of the kind in which the heat exchanger tubes are traversed by the gases to be heated and highly preheated air is used forthe combustion of the fuel and a part of the flue gases is returned into the furnace chamber by positive action.
  • the invention also includes a particularly efiicient mode of operting such heater, whereby the temperature in the 'fumace can be reduced to such an extent that the heat exchanger tubes are no longer heated to an unduly high temperature by the heat radiated from the heating gases passing through the furnace.
  • the returning flue gases are divided into at least two currents before entering the furnace of the heater, one current flowing along those heat exchanger tubes which adjoin the furnace wall and are directly exposed to the heat radiated by the heating gases traversing the furnace, while the other current is introduced into the space directly 'above'the flame.
  • the quantity of flue gases which is returned and mixed with the gases of combustion is preferably so proportioned that the temperature of the heating gases about to enter the space between the heat exchanger tubes to be heated is already lowered to such an extent that the tubes along which these example.
  • Fig. 1 is an axial section of the heater, while Fig. 2 is a cross-section on the line II-II in Fig. 1.
  • Fig. 3 is an axial section showingv a modified form of temperature control
  • Fig. 4 being a cross-section on the line IV-IV in Fig. 3.
  • I is the central heating chamber and 2 and 3 are cylindrical concentric metal partitions extending coaxially from the bottom and top of the heating chamber, respectively, these partitions being arranged in staggered relation so as to cause the heating gases to pass over partition 2 and below partition 3, before rising in contact with the outer wall of the heater.
  • the combustion chamber 6 proper into whichv project the burners 1, is surrounded by a cylindrical partition 5 formed with inclined intake ports 4. Preheated fresh air is supplied to the combustion chamber 6 in axial direction through a tube 8.
  • a large number of heat exchanger tubes 9 are arranged alongside of the furnace wall. Only two such tubes are shown in Fig.
  • All the tubes 9 are connected by their bottom ends to a common annular distributing tube III for the gas to be heated and at the top to a common annular heater pipe H for the heated gas.
  • the heating gases pass through the combustion chamber 6 and the heating chamber I in the direction of the arrows A. Part of them escapes through the tube I2 while the remainder is drawn oil. by a blower l2, through a tube It containing a throttle l4 and is returned into the heater I through a tube It.
  • the returned heating gases are conducted into the heater I in two currents, one of which passes through an annular chamber l6 surrounding the partition 5 and rises in the heater in contact with inner ascending branches of the heater tubes 9 which are directly exposed to the heat radiated from the heating gases rising in the chamber I, so that a substantially cylindrical curtain of cooler gas is formed in front of these tubes, which protects them from direct contact with the heating gases.
  • This gas current may be imparted a spiral move- 1 ment in a helical path by guide vanes I'I arranged in the annular space It.
  • the second current of returned heating gases passes into the cylindrical combustion chamber 6 through the ports 4 in the partition 5, which are so formed and arranged that thissecond p'art current enters the combustion chamber 6 sym-.
  • An annular slide valve l8 surrounding the partition 5 and formed with slots l9 serves for regulating the 'quantity of returned heating gas, admitted to the combustion chamber 6.
  • the valve I8 is operated by a thermostat device 20 extending into the chamber I and controlling the operation of a motor H, which is connected by a gearing 2l and a system of rods 22 with the valve l8.
  • the heating gases entering the combustion chamber 6 form a cooler gas layer above the flames, through which layer the hot flame gases are compelled to pass, mixing with the cooler gases, so that the temperature of the gas-mixture thus formed at the entrance to the heating, chamber proper is lowered uniformly, for instance down to 1000-1200 C.
  • the inner branches .of the tubes 9, which are already protected by the cooler gases issuing from the annular space l6 and have a temperature of for instance 500 to 700 C., can no longer be heated to an unduly high temperature by the heat radiated from the heating gases rising in the chamber l.
  • the quantities of heating gases returned into the heater and the admissible heating temperatures depend largely from the properties and admissible stressing of the materials used in the construction of the heater tubes.
  • thermostat 23 is shown to Z positioned in direct contact with the inner branches of gas tubes 9, being thus enabled to control and regulate the passage of returning heating gases through the ports 4 and annular conduit l0, respectively, in accordance with the temperature of the tube walls.
  • a gas heater comprising in combination, a heating chamber, gas heating tubes havin ascending branches, tubes arranged along the periphery of said heating chamber, a combustion chamber below said heating chamber, means for returning into the heater heating gases, which have already passed through said heating chamber, and means for subdividing said returned gases into two substantially concentric layers, the inner layer entering said chamber directly above the flames so as to envelop them before they issue from said combustionchamber, while the outer layer rises in contact with the inner ascending branches of said gas heating tubes.
  • the gas heater of claim '1 including a perforated wall surrounding the combustion chamber and acting as a subdividing means, said wall being formed with ports for the introduction of the part of the returned gases designed to form the inner layer, and means provided for varying the cross-sectional area of said ports.
  • the gas heater of claim 1 including a periorated wall enclosing the combustion chamber and surrounded by an annular conduit for the passage of that part of the returned gases which shall form the outer layer.
  • the gas heater of claim 1 including guide vanes adapted to impart to the returned gases spiral motion arranged in the path of 'at least one of the currents of returned gases.
  • the gas heater, of claim 1 including an adjustable damper for controlling the quantity of returned gases passing along the heat exchanger tubes.
  • the gas heater of claim 1 in combination with means for regulating the subdivision of the returned gases in response to the temperature in the heating chamber.
  • the gas heater of claim 1 in combination with means for regulating the subdivision of the returned gases in response to the temperature of the heat exchanger tubes.
  • the gas heater of claim 1 in combination with a thermostat device extending into the heating chamber, a valve governing the passage of returned gases into the combustion chamber and a motor controlled by said thermostat device and operatively connected with said valve.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Description

C. KELLER TUBULAR GAS HEATER Oct 3, 1939.
Filed June 28, 1938 I ll 4 III!!! I Patented Oct. 3,1939
UNITED STATES TUBULAR GAS HEATER Curt Keller, Zurich, Switzerland; assignor to Aktiengcsellschaft fiir Technische Studien, Zurich,
Switzerland Application June 28, 1938, Serial No. 216,238 In Switzerland July 8, 193? 8 Claims.
This invention relates to means for heating air and gases and more especially to gas heaters of the tubular type in which the heat energy of gases of combustion (flue gases) is utilized for the heating up of other gases or air. It is an object of this invention to provide means whereby the economy of such gas heaters is improved.
As is well known to persons skilled in the art, if industrial gases or air shall be heated to several hundred degrees centigrade, by means of gases resulting in the combustion of liquid or solid fuel, whilepassing through heat exchanger tubes arranged in a furnace near the furnace wall, the poor heat transfer inside the tubes frequently causes the temperature of the tube walls to rise unduly, and this. the more so, the higher the furnace temperature to which the tubes are exposed. If such gas heater or its burner are also supplied with highly preheated combustion air, the high temperature prevailing in the furnace is likely to injure the heater tubes.
It has already been proposed to return into the furnace part of the flue gases which have already given off part of their heat, and to mix them therein with fresh gases of combustion. It has however been found that if this is done, means adapted to the particular furnace chamber and to the burners must be provided if an eiiicient mixture shall be obtained. This is particularly necessary if air, preheated say to several hundred degrees centigrade, is fed to the burners. In order that in such a case the transmission of heat by direct radiation to the heat exchanger tubes extending alongside of the wall of the furnace chamber shall not be too great, the temperature of the flame must be reduced directly after forma-' tion of the flame.
The present invention relates to a tubular gas heater of the kind in which the heat exchanger tubes are traversed by the gases to be heated and highly preheated air is used forthe combustion of the fuel and a part of the flue gases is returned into the furnace chamber by positive action. The invention also includes a particularly efiicient mode of operting such heater, whereby the temperature in the 'fumace can be reduced to such an extent that the heat exchanger tubes are no longer heated to an unduly high temperature by the heat radiated from the heating gases passing through the furnace.
To this end the returning flue gases are divided into at least two currents before entering the furnace of the heater, one current flowing along those heat exchanger tubes which adjoin the furnace wall and are directly exposed to the heat radiated by the heating gases traversing the furnace, while the other current is introduced into the space directly 'above'the flame. The quantity of flue gases which is returned and mixed with the gases of combustion, is preferably so proportioned that the temperature of the heating gases about to enter the space between the heat exchanger tubes to be heated is already lowered to such an extent that the tubes along which these example.
' In the drawing- Fig. 1 is an axial section of the heater, while Fig. 2 is a cross-section on the line II-II in Fig. 1.
Fig. 3 is an axial section showingv a modified form of temperature control,
Fig. 4 being a cross-section on the line IV-IV in Fig. 3.
Referring to the drawing and first to Figs. 1 and 2, I is the central heating chamber and 2 and 3 are cylindrical concentric metal partitions extending coaxially from the bottom and top of the heating chamber, respectively, these partitions being arranged in staggered relation so as to cause the heating gases to pass over partition 2 and below partition 3, before rising in contact with the outer wall of the heater. The combustion chamber 6 proper into whichv project the burners 1, is surrounded by a cylindrical partition 5 formed with inclined intake ports 4. Preheated fresh air is supplied to the combustion chamber 6 in axial direction through a tube 8. In the heating chamber I a large number of heat exchanger tubes 9 are arranged alongside of the furnace wall. Only two such tubes are shown in Fig. 1, each of which is curved zigzag fashion so as to form two ascending branches connected by a descending branch, the three branches being arranged in a radial plane. All the tubes 9 are connected by their bottom ends to a common annular distributing tube III for the gas to be heated and at the top to a common annular heater pipe H for the heated gas.
i The heating gases pass through the combustion chamber 6 and the heating chamber I in the direction of the arrows A. Part of them escapes through the tube I2 while the remainder is drawn oil. by a blower l2, through a tube It containing a throttle l4 and is returned into the heater I through a tube It. The returned heating gases are conducted into the heater I in two currents, one of which passes through an annular chamber l6 surrounding the partition 5 and rises in the heater in contact with inner ascending branches of the heater tubes 9 which are directly exposed to the heat radiated from the heating gases rising in the chamber I, so that a substantially cylindrical curtain of cooler gas is formed in front of these tubes, which protects them from direct contact with the heating gases.
This gas current may be imparted a spiral move- 1 ment in a helical path by guide vanes I'I arranged in the annular space It.
The second current of returned heating gases passes into the cylindrical combustion chamber 6 through the ports 4 in the partition 5, which are so formed and arranged that thissecond p'art current enters the combustion chamber 6 sym-.
metrically to its axis and directly above the heating flames issuing from the burners I. The passages for the returned heating gases are so dimensioned that the quantity of gas which passes through the annular space Iii is about one fourth of the quantity passing through the ports 4 into the combustion chamber 6. An annular slide valve l8 surrounding the partition 5 and formed with slots l9 (Fig. 2) serves for regulating the 'quantity of returned heating gas, admitted to the combustion chamber 6. The valve I8 is operated by a thermostat device 20 extending into the chamber I and controlling the operation of a motor H, which is connected by a gearing 2l and a system of rods 22 with the valve l8.
In the gas heater above described, the heating gases entering the combustion chamber 6 form a cooler gas layer above the flames, through which layer the hot flame gases are compelled to pass, mixing with the cooler gases, so that the temperature of the gas-mixture thus formed at the entrance to the heating, chamber proper is lowered uniformly, for instance down to 1000-1200 C. In consequence thereof the inner branches .of the tubes 9, which are already protected by the cooler gases issuing from the annular space l6 and have a temperature of for instance 500 to 700 C., can no longer be heated to an unduly high temperature by the heat radiated from the heating gases rising in the chamber l.
The quantities of heating gases returned into the heater and the admissible heating temperatures depend largely from the properties and admissible stressing of the materials used in the construction of the heater tubes.
InFigs. 3 and 4 the thermostat 23 is shown to Z positioned in direct contact with the inner branches of gas tubes 9, being thus enabled to control and regulate the passage of returning heating gases through the ports 4 and annular conduit l0, respectively, in accordance with the temperature of the tube walls. 1
Various changes may be made in the details disclosed in the foregoing specification without departing from the invention or sacrificing the advantages thereof.
1 claim:
1. A gas heater comprising in combination, a heating chamber, gas heating tubes havin ascending branches, tubes arranged along the periphery of said heating chamber, a combustion chamber below said heating chamber, means for returning into the heater heating gases, which have already passed through said heating chamber, and means for subdividing said returned gases into two substantially concentric layers, the inner layer entering said chamber directly above the flames so as to envelop them before they issue from said combustionchamber, while the outer layer rises in contact with the inner ascending branches of said gas heating tubes.
2. The gas heater of claim '1, including a perforated wall surrounding the combustion chamber and acting as a subdividing means, said wall being formed with ports for the introduction of the part of the returned gases designed to form the inner layer, and means provided for varying the cross-sectional area of said ports.
3. The gas heater of claim 1, including a periorated wall enclosing the combustion chamber and surrounded by an annular conduit for the passage of that part of the returned gases which shall form the outer layer. a
4. The gas heater of claim 1, including guide vanes adapted to impart to the returned gases spiral motion arranged in the path of 'at least one of the currents of returned gases.
5. The gas heater, of claim 1, including an adjustable damper for controlling the quantity of returned gases passing along the heat exchanger tubes. V
6. The gas heater of claim 1 in combination with means for regulating the subdivision of the returned gases in response to the temperature in the heating chamber.
'7. The gas heater of claim 1 in combination with means for regulating the subdivision of the returned gases in response to the temperature of the heat exchanger tubes.
8. The gas heater of claim 1 in combination with a thermostat device extending into the heating chamber, a valve governing the passage of returned gases into the combustion chamber and a motor controlled by said thermostat device and operatively connected with said valve.
CURT KELLER.
US216238A 1937-07-08 1938-06-28 Tubular gas heater Expired - Lifetime US2174663A (en)

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Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2419463A (en) * 1943-05-19 1947-04-22 Tech Studien Ag Furnace having sequentially arranged gas heating tubes
US2419626A (en) * 1943-01-29 1947-04-29 Petroleum Heat & Power Co Heater
US2438416A (en) * 1943-07-21 1948-03-23 Tech Studien Ag Pulverized fuel burning gas heater
US2447252A (en) * 1940-07-17 1948-08-17 Jimenez Ramon Castro Heating apparatus with provision for utilizing combustion gases
US2450518A (en) * 1944-03-18 1948-10-05 Alexander M Lister Air heater for castings
US2495550A (en) * 1944-05-26 1950-01-24 Tech Studien Ag Operating gas heater for thermal power plants
US2517399A (en) * 1945-03-23 1950-08-01 Stewart Warner Corp Heater having means to recirculate partially cooled products of combustion
US2520637A (en) * 1946-10-10 1950-08-29 Selas Corp Of America Apparatus for heat-treating granular materials
US2565857A (en) * 1945-05-28 1951-08-28 Tech Studien Ag Method of and apparatus for preventing slagging in tubular element gas heating furnaces
US2568781A (en) * 1948-03-11 1951-09-25 Anna May Watts Sergent Vertical boiler
US2614541A (en) * 1946-12-14 1952-10-21 Comb Eng Superheater Inc High temperature fluid heater
US2617405A (en) * 1948-08-07 1952-11-11 Tech Studien Ag Tubular gas heater, in particular for solid fuels
US2630307A (en) * 1948-12-09 1953-03-03 Carbonic Products Inc Method of recovering oil from oil shale
US2637637A (en) * 1950-03-24 1953-05-05 Lenore C Bates Apparatus for vaporizing liquid hydrocarbons
US2641905A (en) * 1948-06-21 1953-06-16 Tech Studien Ag Closed circuit power plant having bypass means to regulate heat input to each turbine
US2648599A (en) * 1949-03-22 1953-08-11 Petro Chem Process Company Inc Heat control in vertical furnace by flue gas recirculation
US2688360A (en) * 1951-04-13 1954-09-07 Thermo Projects Inc Fuel combustion system, including gas assisted atomizer
US2699818A (en) * 1950-08-29 1955-01-18 Stewart Warner Corp Heater partial exhaust gas, recirculating means for relief of pulsations
US2703565A (en) * 1951-02-01 1955-03-08 Diesel Dynamics Corp Combustion heater
US2725873A (en) * 1952-03-07 1955-12-06 Worthington Corp Heat exchanger utilizing products of combustion as a heating medium
US2787256A (en) * 1951-09-13 1957-04-02 Ilune Georges Heat exchanger
US2790435A (en) * 1952-07-31 1957-04-30 Thermal Res And Engineering Co High capacity fluid heater
US2874767A (en) * 1955-08-02 1959-02-24 Hendrik N F Verloop Rotary atomizing burner apparatus for liquid fuel
US2918117A (en) * 1956-10-04 1959-12-22 Petro Chem Process Company Inc Heavy fuel burner with combustion gas recirculating means
DE1127523B (en) * 1957-05-07 1962-04-12 Wagner Hochdruck Dampfturbinen Liquid fuel burners
US3057611A (en) * 1960-02-15 1962-10-09 Bjerkan Engineering Service In Burner-blower combination for grain dryers
US3073583A (en) * 1960-10-28 1963-01-15 John Wood Company Heater
US3099436A (en) * 1960-02-04 1963-07-30 Midland Ross Corp Burner assembly for hydrocarbon fuel
US3319947A (en) * 1964-12-14 1967-05-16 Century Engineering Corp Portable space heaters
US3340864A (en) * 1965-04-12 1967-09-12 Torian William Harold Smoke cooking device
US3565406A (en) * 1969-04-29 1971-02-23 Aeroil Prod Space heater
US4051231A (en) * 1974-09-23 1977-09-27 Ford, Bacon & Davis Texas, Inc. Production of internal atmospheres for kilns
US4069020A (en) * 1974-09-23 1978-01-17 Ford, Bacon & Davis Texas Inc. Production of reducing gases
US4123220A (en) * 1976-03-31 1978-10-31 Ford, Bacon & Davis Texas, Inc. Gas mixer and reactor
US4659305A (en) * 1985-12-30 1987-04-21 Aqua-Chem, Inc. Flue gas recirculation system for fire tube boilers and burner therefor
US5073105A (en) * 1991-05-01 1991-12-17 Callidus Technologies Inc. Low NOx burner assemblies
US5275554A (en) * 1990-08-31 1994-01-04 Power-Flame, Inc. Combustion system with low NOx adapter assembly
US5458481A (en) * 1994-01-26 1995-10-17 Zeeco, Inc. Burner for combusting gas with low NOx production
US5542840A (en) * 1994-01-26 1996-08-06 Zeeco Inc. Burner for combusting gas and/or liquid fuel with low NOx production
US20160076761A1 (en) * 2014-09-17 2016-03-17 Atd Combustors, Llc Furnaces and methods of reducing heat degrading of metal heating coils of furnaces
US9593848B2 (en) 2014-06-09 2017-03-14 Zeeco, Inc. Non-symmetrical low NOx burner apparatus and method
US9593847B1 (en) 2014-03-05 2017-03-14 Zeeco, Inc. Fuel-flexible burner apparatus and method for fired heaters
US9909755B2 (en) 2013-03-15 2018-03-06 Fives North American Combustion, Inc. Low NOx combustion method and apparatus

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2447252A (en) * 1940-07-17 1948-08-17 Jimenez Ramon Castro Heating apparatus with provision for utilizing combustion gases
US2419626A (en) * 1943-01-29 1947-04-29 Petroleum Heat & Power Co Heater
US2419463A (en) * 1943-05-19 1947-04-22 Tech Studien Ag Furnace having sequentially arranged gas heating tubes
US2438416A (en) * 1943-07-21 1948-03-23 Tech Studien Ag Pulverized fuel burning gas heater
US2450518A (en) * 1944-03-18 1948-10-05 Alexander M Lister Air heater for castings
US2495550A (en) * 1944-05-26 1950-01-24 Tech Studien Ag Operating gas heater for thermal power plants
US2517399A (en) * 1945-03-23 1950-08-01 Stewart Warner Corp Heater having means to recirculate partially cooled products of combustion
US2565857A (en) * 1945-05-28 1951-08-28 Tech Studien Ag Method of and apparatus for preventing slagging in tubular element gas heating furnaces
US2520637A (en) * 1946-10-10 1950-08-29 Selas Corp Of America Apparatus for heat-treating granular materials
US2614541A (en) * 1946-12-14 1952-10-21 Comb Eng Superheater Inc High temperature fluid heater
US2568781A (en) * 1948-03-11 1951-09-25 Anna May Watts Sergent Vertical boiler
US2641905A (en) * 1948-06-21 1953-06-16 Tech Studien Ag Closed circuit power plant having bypass means to regulate heat input to each turbine
US2617405A (en) * 1948-08-07 1952-11-11 Tech Studien Ag Tubular gas heater, in particular for solid fuels
US2630307A (en) * 1948-12-09 1953-03-03 Carbonic Products Inc Method of recovering oil from oil shale
US2648599A (en) * 1949-03-22 1953-08-11 Petro Chem Process Company Inc Heat control in vertical furnace by flue gas recirculation
US2637637A (en) * 1950-03-24 1953-05-05 Lenore C Bates Apparatus for vaporizing liquid hydrocarbons
US2699818A (en) * 1950-08-29 1955-01-18 Stewart Warner Corp Heater partial exhaust gas, recirculating means for relief of pulsations
US2703565A (en) * 1951-02-01 1955-03-08 Diesel Dynamics Corp Combustion heater
US2688360A (en) * 1951-04-13 1954-09-07 Thermo Projects Inc Fuel combustion system, including gas assisted atomizer
US2787256A (en) * 1951-09-13 1957-04-02 Ilune Georges Heat exchanger
US2725873A (en) * 1952-03-07 1955-12-06 Worthington Corp Heat exchanger utilizing products of combustion as a heating medium
US2790435A (en) * 1952-07-31 1957-04-30 Thermal Res And Engineering Co High capacity fluid heater
US2874767A (en) * 1955-08-02 1959-02-24 Hendrik N F Verloop Rotary atomizing burner apparatus for liquid fuel
US2918117A (en) * 1956-10-04 1959-12-22 Petro Chem Process Company Inc Heavy fuel burner with combustion gas recirculating means
DE1127523B (en) * 1957-05-07 1962-04-12 Wagner Hochdruck Dampfturbinen Liquid fuel burners
US3099436A (en) * 1960-02-04 1963-07-30 Midland Ross Corp Burner assembly for hydrocarbon fuel
US3057611A (en) * 1960-02-15 1962-10-09 Bjerkan Engineering Service In Burner-blower combination for grain dryers
US3073583A (en) * 1960-10-28 1963-01-15 John Wood Company Heater
US3319947A (en) * 1964-12-14 1967-05-16 Century Engineering Corp Portable space heaters
US3340864A (en) * 1965-04-12 1967-09-12 Torian William Harold Smoke cooking device
US3565406A (en) * 1969-04-29 1971-02-23 Aeroil Prod Space heater
US4051231A (en) * 1974-09-23 1977-09-27 Ford, Bacon & Davis Texas, Inc. Production of internal atmospheres for kilns
US4069020A (en) * 1974-09-23 1978-01-17 Ford, Bacon & Davis Texas Inc. Production of reducing gases
US4123220A (en) * 1976-03-31 1978-10-31 Ford, Bacon & Davis Texas, Inc. Gas mixer and reactor
US4659305A (en) * 1985-12-30 1987-04-21 Aqua-Chem, Inc. Flue gas recirculation system for fire tube boilers and burner therefor
US5275554A (en) * 1990-08-31 1994-01-04 Power-Flame, Inc. Combustion system with low NOx adapter assembly
US5073105A (en) * 1991-05-01 1991-12-17 Callidus Technologies Inc. Low NOx burner assemblies
US5458481A (en) * 1994-01-26 1995-10-17 Zeeco, Inc. Burner for combusting gas with low NOx production
US5542840A (en) * 1994-01-26 1996-08-06 Zeeco Inc. Burner for combusting gas and/or liquid fuel with low NOx production
US9909755B2 (en) 2013-03-15 2018-03-06 Fives North American Combustion, Inc. Low NOx combustion method and apparatus
US9593847B1 (en) 2014-03-05 2017-03-14 Zeeco, Inc. Fuel-flexible burner apparatus and method for fired heaters
US9593848B2 (en) 2014-06-09 2017-03-14 Zeeco, Inc. Non-symmetrical low NOx burner apparatus and method
US20160076761A1 (en) * 2014-09-17 2016-03-17 Atd Combustors, Llc Furnaces and methods of reducing heat degrading of metal heating coils of furnaces
US9989246B2 (en) * 2014-09-17 2018-06-05 Atd Combustors, Llc Furnaces and methods of reducing heat degrading of metal heating coils of furnaces

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