US2902086A - System of fluid fuel supply for multiple burner operation - Google Patents

System of fluid fuel supply for multiple burner operation Download PDF

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US2902086A
US2902086A US500895A US50089555A US2902086A US 2902086 A US2902086 A US 2902086A US 500895 A US500895 A US 500895A US 50089555 A US50089555 A US 50089555A US 2902086 A US2902086 A US 2902086A
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oil
burners
pump
burner
pressure
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US500895A
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Hobson Eric Dott
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Yarrow and Co Ltd
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Yarrow and Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/24—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space
    • F23D11/26—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space with provision for varying the rate at which the fuel is sprayed
    • F23D11/28—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by pressurisation of the fuel before a nozzle through which it is sprayed by a substantial pressure reduction into a space with provision for varying the rate at which the fuel is sprayed with flow-back of fuel at the burner, e.g. using by-pass

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  • This invention relates to-oil burning installations .for furnacesof thekind wherein oil issupplie'd totthe burner by suitable pumping means and the operational range of .the burner .is controlled by providing means for bypassing surplus quantities of oil at a pointupstream of .the burner discharge' orifice.
  • the by-pass will be closed so that the-whole of the oil will be injected-into the :furnace, but when it .is'desired to operate at a lower rating, the byepass willbe opened to permit acontrolledtquantity oftoilqto be bypassed.
  • an oil burning .installation for a furnace having spilltype burners comprises apump connectedin the oil fiow aline fordelivering .oil.to oil heating:means,,a.second pump operating at ,a higher pressure than the first for 'delivering ;oil.discharged from the heater to'the oilburners of [the furnace and means for collecting the spilled ,oilzby-passed from .the blJIllflS'fiS surplus to requirements .anddelivering it into the oil flow line at a pointintermediatethe heater and-the first mentioned pump.
  • thehot spilled oil is recirculated to the oil system and its heat is accordingly conserved thereby enabling the heating device to operate withrless input heat than would otherwise bethe case.
  • the heating device maybe in the form of a heat exchanger including concentric flowpassages through which steam and oil tobe heated are caused to flow.
  • a temperature control device is provided at the infeed-of the heat exchanger to control the supply-of heating steam inaccordance with the oil-temperature it is desired tomaintain atthe outfeed of the heateror at theentry -to-the burner so as to ensure that when itreaches the atomisingnoz-zle of the burner it will be at a suitable -'temperature-and viscosity for .efiicient atomisation.
  • an oil-burning Patented Sept. 1, 1959 ICC installation includes a low pressure pump 1 having its inlet connected to a pipe ,2 connected :to a storage tank (not shown) containing oil which Will normally beat a relatively low temperature.
  • a strainer 3- is provided in the pipe 2.
  • the discharge side of the pump 1 is connected with apipe 4 leading to amixing chamber 5 whose dischargetside is connected to a pipe .leadingto the infeeds of a pair ,ofheat exchangers 6.
  • Each heat exchanger includes-oil passages 7, .7 a and steam passages 8, 8a, the steam passages having inlets 9 .and an outlet 10.
  • the mixingchamber is an enlarged right cylinder with its axis mounted in a-vertical plane.
  • the cold oil inlet pipe 4 connects to the center of the bottom of chamber 5.
  • the oil discharged from the heat exchangers flows through a pipe 12 and filter 12a to a pump 13 which is adapted to operate at a higher pressure than the pump 11 and deliver the heated oil through the pipe 14 to the burners 15 of thefurnace.
  • Aby-pass conduit 16 is provided for each burner and is connected .with a main bypass pipe 17 leadingto themixing charnber 5.
  • T he operationalrangepf .the burners is controlled by adjusting a regulator valve 18 intheby-pass pipe 17 so as to vary the amount of oil by-passed from the burners.
  • the arrangement is such that the ⁇ pressure in the mixing chamber is at a-minimum whenthearate 'of' spill registers its maximum, that is, at ,periods when the :burners are operating at low demand.
  • the-valve ;21 has a diaphragm'disposed in a diaphragm chamber 22, one side'ofthe diaphragm being connected by a-pipe 23, to the suction side .of the pump 13 and-the otherbeing connected to atmosphere bya pipe 23a so that when the pressure at the suction side of the pump 13 exceeds the predeteiminedfigure, *for example 10 lbs. above atmospheric pressure, :the diaphragm will be actuated to open the valve 21.
  • a by-pass 24, including a pressure relief valve 25, is provided between the discharge and inlet sides of the high pressure pump 13. This valve is, however, only a safety device and under normal conditions it will remain closed.
  • a by-pass 31 having a relief valve 32 is also provided connecting the inlet and outlet sides of the low pressure pump 1.
  • the pumps 1 and 13 are designed to run at constant speeds and as shown are driven through suitable gearing by a common prime mover 26 such as a steam turbine through shafts 36 and 38. If desired, however, each pump may be independently driven.
  • any desired number can be completely shut down by the valves 14a, 17a and for example only two burners left in use.
  • the supply of oil would be curtailed by running the pumps 1, 13 at reduced speed, no adjustment of the heaters being required.
  • both pumps are driven by a common prime mover, the control of the latter would automatically effect a simultaneous and equal reduction in the speed of both pumps.
  • the temperature of the heat exchangers 6 is adapted to be adjusted to ensure that the oil will be at a temperature such as to ensure eflicient atomisation when it reaches the burners.
  • the steam inlets 9 of the heat exchangers 6 are connected to a common steam supply line 9a which has a valve A which is connected with a heat responsive element or de- 'vice B located in the flow line 14.
  • the arrangement is such that the supply of heating steam to the exchangers 6 is automatically controlled in accordance with the temperature of the oil discharged from the heat exchangers.
  • either of the heat exchangers 6 may be shut down by closing the respective oil inlet and discharge valves 6a, 6b and the appropriate steam inlet valve 912. It will be noted that the arrangement of the temperature control is such that the valve A will operate to control the flow of heating steam irrespective as to whether one or both heat exchangers are in use.
  • An important advantage of the invention is that the hot spill oil is safely disposed of and the danger of fire or explosion which might result if the hot oil were returned to the fuel tank, is entirely eliminated.
  • a further advantage is that, by adjustment of the setting of the oil temperature control according to the grade of oil being consumed, the viscosity and pressure of the oil supplied to the high pressure pump 13 will remain unaltered regardless of its viscosity as it is being drawn from the storage tank. In consequence the pressure characterised at the output of this pump will be unafiected by the grade and temperature of the oil entering the low pressure pump 1, whether it be the normally used heavy boiler oil or any lighter and less viscous oil.
  • An important advantage of positioning the heater be tween the low and high pressure pumps is that the heater may be designed to operate at the low pressure of the oil being supplied by the low pressure pump.
  • An advantage of positioning the filter 12a between the pumps 1, 13 is that the pressure in the filter cannot exceed that of the pump 1, as the relief valve 32 will automatically open if the back pressure due to the filter becomes eXQt SS
  • the provision of additional valves to control the flow of oil to the burners is accordingly obviated.
  • the regulator valve 18 may be operated by remote control from an instrument panel.
  • each burner being connected to the oil fiow line leading from the high pressure pump and connected with a by-pass conduit 16 at a point upstream of their discharge orifices.
  • the pumps 1 and 13 may be of any convenient type and the heat exchanger may take other forms than that shown.
  • the installation may be made adaptable for various grades of fuel oil and to this end one or more valve controlled connections, such as 28 may be provided for the flow line on the suction side of the pump 1.
  • a diesel oil supply pipe may be connected to the connection 28 and the supply to the pipe 2 shut off by closing the valve 29 and the diesel supply opened by opening the valve 30.
  • the invention is particularly adapted for oil burning furnace installations for marine propulsion plant.
  • an oil burning installation for a furnace including a plurality of spill type burners, an oil fiow line connected with the supply side of the burners, a heater in said flow line, a mixing chamber connected in said flow line upstream of said heater, a low pressure pump for delivering oil fuel through said chamber to the heater, a by-pass conduit connecting the downstream side of each of said burners with said mixing chamber, a high pressure pump connected in the flow line between the heater and the supply side of the burners for delivering the heated oil to the burners, said mixing chamber comprising a cylindrical member, an axially disposed inlet port in the bottom thereof communicating with said low pressure pump for supplying oil at a relatively low temperature, annularly disposed nozzle means mounted in the lower portion of said cylindrical member and connected to said bypass conduit and directed to inject oil in streams tangentially of the flow path of the oil delivered from said low pressure pump, the pressure in said mixing chamber being maintained less than that of the oil being spilled from said burners by the combination of high and low pressure pumps, and means for regulating the
  • An oil burning installation for a furnace having a series of spill type burners comprising an oil flow line connected with the supply side of the burners, a heater in said flow line, a low pressure pump for delivering oil to the heater, a mixing chamber connected in said flow line between said heater and said low pressure pump, a common by-pass conduit for receiving hot oil spilled over from all said burners and delivering it into said mixing chamber, a high pressure pump connected in the flow line between the heater and the supply side of the burners for supplying oil heated by said heater to said burners, means for automatically controlling the heater to ensure that the oil discharged therefrom will be at a predetermined constant temperature, said mixing chamber including a cylindrical member, an inlet portion axially disposed in the bottom of the cylindrical member and connected to said low pressure pump, nozzle means positioned within the lower end of said cylindrical member and connected to said bypass for delivering hot oil spilled from said burners to the lower end of said cylindrical 6 member whereby said hot oil is directed through said References Cited in the file of this patent nozzle

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Feeding And Controlling Fuel (AREA)

Description

p 1959 E. nuossou 2,902,086
SYSTEM OF FL UID FUEL SUPPLY FOR MULTIPLE BURNER OPERATION Filed April 12. 1955 \NVENTOR M ATToRNEYS United States Patent' -O SYSTEM OF FLUID EUEL'SUPRLYFOR MULTIPLE BURNER :QPERAIION E ric Dott Hobson, ShandomScotl-and, assig'nor-to Yarrow and Company Limited,-Scotstown, GlasgW,'Sc0tland Application April 12, -1955,-S erial N0..-50'0,-895
Claims priority, application Great Britain April 22, 1954 .2 Claims. (Cl. 158-363) This invention relates to-oil burning installations .for furnacesof thekind wherein oil issupplie'd totthe burner by suitable pumping means and the operational range of .the burner .is controlled by providing means for bypassing surplus quantities of oil at a pointupstream of .the burner discharge' orifice. Accordingly ,inoperating such installations, .when the burner isto ,operate at-maximum output the by-pass will be closed so that the-whole of the oil will be injected-into the :furnace, but when it .is'desired to operate at a lower rating, the byepass willbe opened to permit acontrolledtquantity oftoilqto be bypassed. The burners of this -kind:are generally k-nownas spill type burners.
In order that the .oil reaching the burner has the requisite viscosity toensure eflicientatomisatiomit is known to provide a heating device in the 'oil flow line and to pro- \vide high and lower pressure pumps-for feeding the oil to the burner. Hitherto a-majordifficulty of operating ,oil burning installations ,of this kind has beenarranging for the satisfactory disposalzof the hobby-passed oil, and it is an object ofthe presentinvention tto provide-means whereby this oil is safely disposed of ;in a manner that will improve the overall efficiencyof ithetinstallation.
According to the present invention ;an oil burning .installation for a furnace having spilltype burners comprises apump connectedin the oil fiow aline fordelivering .oil.to oil heating:means,,a.second pump operating at ,a higher pressure than the first for 'delivering ;oil.discharged from the heater to'the oilburners of [the furnace and means for collecting the spilled ,oilzby-passed from .the blJIllflS'fiS surplus to requirements .anddelivering it into the oil flow line at a pointintermediatethe heater and-the first mentioned pump.
By this arrangement thehot spilled oil is recirculated to the oil system and its heat is accordingly conserved thereby enabling the heating device to operate withrless input heat than would otherwise bethe case.
The heating device maybe in the form of a heat exchanger including concentric flowpassages through which steam and oil tobe heated are caused to flow. A temperature control device is provided at the infeed-of the heat exchanger to control the supply-of heating steam inaccordance with the oil-temperature it is desired tomaintain atthe outfeed of the heateror at theentry -to-the burner so as to ensure that when itreaches the atomisingnoz-zle of the burner it will be at a suitable -'temperature-and viscosity for .efiicient atomisation.
To enable .the invention to be fully understood it will now be described with reference to the accompanying drawing, which illustrates in diagrammatic forman oil burning installation accordingtotone aembodiment of the invention.
As shown in the accompanying drawing, an oil-burning Patented Sept. 1, 1959 ICC installation includes a low pressure pump 1 having its inlet connected to a pipe ,2 connected :to a storage tank (not shown) containing oil which Will normally beat a relatively low temperature. As shown a strainer 3-is provided in the pipe 2. The discharge side of the pump 1 is connected with apipe 4 leading to amixing chamber 5 whose dischargetside is connected to a pipe .leadingto the infeeds of a pair ,ofheat exchangers 6. Each heat exchanger includes-oil passages 7, .7 a and steam passages 8, 8a, the steam passages having inlets 9 .and an outlet 10. Asshown in the drawing, the mixingchamber is an enlarged right cylinder with its axis mounted in a-vertical plane. The cold oil inlet pipe 4 connects to the center of the bottom of chamber 5.
The oil discharged from the heat exchangers flows through a pipe 12 and filter 12a to a pump 13 which is adapted to operate at a higher pressure than the pump 11 and deliver the heated oil through the pipe 14 to the burners 15 of thefurnace. Aby-pass conduit 16 is provided for each burner and is connected .with a main bypass pipe 17 leadingto themixing charnber 5. T he operationalrangepf .the burners is controlled by adjusting a regulator valve 18 intheby-pass pipe 17 so as to vary the amount of oil by-passed from the burners.
.Spilled oil surplus torequirements of the burners passes through the conduits .16 and by-pass 17, to the mixing chamber 5 Where it-is recirculatedthroughthe oil system by mixing with the relatively cold oil being pumped by the pump 1. The temperature ofthisoil is thus raised by the hotspilled oil and the mixed oil then flows to spilled from theburners intorder totensurethat'the spilled oil will readily flow intothe chamber irrespective ;of the quantity spilled. .It is .notedthat low pressure pump 1 supplies soil to an enlarged cylindrical mixing-chamber -5 and that a high pressure; pump-13 supplies-oil .under high pressure touthe burners 15. The pressure till the bypass .17 is maintained by.oil--fr0m the ihighpressure' pump :13
fed through the spillway in the burners. Preferably the arrangement is such that the {pressure in the mixing chamber is at a-minimum whenthearate 'of' spill registers its maximum, that is, at ,periods when the :burners are operating at low demand.
It is desirable to maintaina substantially constant pressure, adequate to prevent vaporisation of the ;oil, at the inlet side of the high pressure pump 13 and to ensure this a -by-pass pipe ,20 is connected between the discharge and inlet-sides of'the low pressure pump 1, a pressure responsive valve 21 being provided which is .arranged to open automatically if the .pressure at the-suction side-of the high pressure pump 13 exceeds a predetermined figure, for example 10 lbs. above'atmospherie pressure. As shown the-valve ;21 has a diaphragm'disposed in a diaphragm chamber 22, one side'ofthe diaphragm being connected by a-pipe 23, to the suction side .of the pump 13 and-the otherbeing connected to atmosphere bya pipe 23a so that whenthe pressure at the suction side of the pump 13 exceeds the predeteiminedfigure, *for example 10 lbs. above atmospheric pressure, :the diaphragm will be actuated to open the valve 21.
-It will be'noted' that the pipe 23 is connected :in the flow line to pump 13 downstream of the filter 12a and accordingly the pressure at the suction side of the pump 13 can be accurately controlled and will not be affected by the condition, for example choking up, of the filter.
To prevent damage to the 'high pressure pump in the event that for some reason the burner valves are not open when the installation is operating, a by-pass 24, including a pressure relief valve 25, is provided between the discharge and inlet sides of the high pressure pump 13. This valve is, however, only a safety device and under normal conditions it will remain closed. A by-pass 31 having a relief valve 32 is also provided connecting the inlet and outlet sides of the low pressure pump 1.
The pumps 1 and 13 are designed to run at constant speeds and as shown are driven through suitable gearing by a common prime mover 26 such as a steam turbine through shafts 36 and 38. If desired, however, each pump may be independently driven.
When the burners are required to operate at light load, instead of all the burners remaining in operation, any desired number can be completely shut down by the valves 14a, 17a and for example only two burners left in use. In this case the supply of oil would be curtailed by running the pumps 1, 13 at reduced speed, no adjustment of the heaters being required. When both pumps are driven by a common prime mover, the control of the latter would automatically effect a simultaneous and equal reduction in the speed of both pumps.
The temperature of the heat exchangers 6 is adapted to be adjusted to ensure that the oil will be at a temperature such as to ensure eflicient atomisation when it reaches the burners.
According to one form of temperature control, the steam inlets 9 of the heat exchangers 6 are connected to a common steam supply line 9a which has a valve A which is connected with a heat responsive element or de- 'vice B located in the flow line 14. The arrangement is such that the supply of heating steam to the exchangers 6 is automatically controlled in accordance with the temperature of the oil discharged from the heat exchangers.
If desired either of the heat exchangers 6 may be shut down by closing the respective oil inlet and discharge valves 6a, 6b and the appropriate steam inlet valve 912. It will be noted that the arrangement of the temperature control is such that the valve A will operate to control the flow of heating steam irrespective as to whether one or both heat exchangers are in use.
By this means when the burner is operating under light load and a relatively large quantity of hot spill oil is being by-passed and mixed with the incoming cold oil, the supply of heating steam to the heat exchangers can be greatly reduced without impairing the efficiency of the installation.
An important advantage of the invention is that the hot spill oil is safely disposed of and the danger of fire or explosion which might result if the hot oil were returned to the fuel tank, is entirely eliminated.
A further advantage is that, by adjustment of the setting of the oil temperature control according to the grade of oil being consumed, the viscosity and pressure of the oil supplied to the high pressure pump 13 will remain unaltered regardless of its viscosity as it is being drawn from the storage tank. In consequence the pressure characterised at the output of this pump will be unafiected by the grade and temperature of the oil entering the low pressure pump 1, whether it be the normally used heavy boiler oil or any lighter and less viscous oil.
An important advantage of positioning the heater be tween the low and high pressure pumps is that the heater may be designed to operate at the low pressure of the oil being supplied by the low pressure pump. An advantage of positioning the filter 12a between the pumps 1, 13 is that the pressure in the filter cannot exceed that of the pump 1, as the relief valve 32 will automatically open if the back pressure due to the filter becomes eXQt SS By maintaining constant viscosity and pressure of the fuel at the inlet of the high pressure pump 13 and selecting suitable pressure-output characteristics at the outlet side of this pump, correct burner inlet pressure is assured for any desired burner output by adjustment of the single regulator valve 18 which controls the rate at which spilled oil flows through the by-pass 17. The provision of additional valves to control the flow of oil to the burners is accordingly obviated.
The regulator valve 18 may be operated by remote control from an instrument panel.
It will be understood that any desired number of burners may be included in the installation, each burner being connected to the oil fiow line leading from the high pressure pump and connected with a by-pass conduit 16 at a point upstream of their discharge orifices.
The pumps 1 and 13 may be of any convenient type and the heat exchanger may take other forms than that shown.
The installation may be made adaptable for various grades of fuel oil and to this end one or more valve controlled connections, such as 28 may be provided for the flow line on the suction side of the pump 1. For example a diesel oil supply pipe may be connected to the connection 28 and the supply to the pipe 2 shut off by closing the valve 29 and the diesel supply opened by opening the valve 30.
The invention is particularly adapted for oil burning furnace installations for marine propulsion plant.
I claim:
1. In an oil burning installation for a furnace including a plurality of spill type burners, an oil fiow line connected with the supply side of the burners, a heater in said flow line, a mixing chamber connected in said flow line upstream of said heater, a low pressure pump for delivering oil fuel through said chamber to the heater, a by-pass conduit connecting the downstream side of each of said burners with said mixing chamber, a high pressure pump connected in the flow line between the heater and the supply side of the burners for delivering the heated oil to the burners, said mixing chamber comprising a cylindrical member, an axially disposed inlet port in the bottom thereof communicating with said low pressure pump for supplying oil at a relatively low temperature, annularly disposed nozzle means mounted in the lower portion of said cylindrical member and connected to said bypass conduit and directed to inject oil in streams tangentially of the flow path of the oil delivered from said low pressure pump, the pressure in said mixing chamber being maintained less than that of the oil being spilled from said burners by the combination of high and low pressure pumps, and means for regulating the operation of said burners comprising a single valve in said by-pass conduit for regulating the amount of oil by-passed from said burners into the said mixing chamber.
2. An oil burning installation for a furnace having a series of spill type burners, comprising an oil flow line connected with the supply side of the burners, a heater in said flow line, a low pressure pump for delivering oil to the heater, a mixing chamber connected in said flow line between said heater and said low pressure pump, a common by-pass conduit for receiving hot oil spilled over from all said burners and delivering it into said mixing chamber, a high pressure pump connected in the flow line between the heater and the supply side of the burners for supplying oil heated by said heater to said burners, means for automatically controlling the heater to ensure that the oil discharged therefrom will be at a predetermined constant temperature, said mixing chamber including a cylindrical member, an inlet portion axially disposed in the bottom of the cylindrical member and connected to said low pressure pump, nozzle means positioned within the lower end of said cylindrical member and connected to said bypass for delivering hot oil spilled from said burners to the lower end of said cylindrical 6 member whereby said hot oil is directed through said References Cited in the file of this patent nozzle means, the pressure in said mixing chamber being maintained less than that of the oil being spilled from UNITED STATES PATENTS said burners by the combination of high and low pres- 1,554,869 McAndreWs Sept. 22, 1925 sure pumps, and means for controlling the operation of 5 2,219,917 Crosiar Oct. 29, 1940 said burners comprising a single valve in said by-pass 2,263,913 Bargeboer Nov. 25,1941 conduit operable to regulate the amount of hot spilled 2,355,693 Aldrich Aug. 15, 1944 oil permitted to flow into said by-pass conduit. 2,368,164 Schumann et 3 9
US500895A 1954-04-22 1955-04-12 System of fluid fuel supply for multiple burner operation Expired - Lifetime US2902086A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073376A (en) * 1957-04-08 1963-01-15 Yarrow & Co Ltd Oil burning installations for furnaces
US3199568A (en) * 1961-07-05 1965-08-10 Herbert Baumanns Oil heating appliance

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1554869A (en) * 1923-12-20 1925-09-22 Mcandrews John Joseph Automatic fire-control and fuel-economizer system
US2219917A (en) * 1937-07-31 1940-10-29 Glenn F Crosiar Oil burner
US2263913A (en) * 1939-03-07 1941-11-25 Bargeboer Adolf Installation for burning liquid fuel
US2355693A (en) * 1939-02-02 1944-08-15 Loyd I Aldrich Fuel preheater
US2368164A (en) * 1940-12-21 1945-01-30 Hauck Mfg Co System of fluid fuel supply for multiple burners operation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1554869A (en) * 1923-12-20 1925-09-22 Mcandrews John Joseph Automatic fire-control and fuel-economizer system
US2219917A (en) * 1937-07-31 1940-10-29 Glenn F Crosiar Oil burner
US2355693A (en) * 1939-02-02 1944-08-15 Loyd I Aldrich Fuel preheater
US2263913A (en) * 1939-03-07 1941-11-25 Bargeboer Adolf Installation for burning liquid fuel
US2368164A (en) * 1940-12-21 1945-01-30 Hauck Mfg Co System of fluid fuel supply for multiple burners operation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3073376A (en) * 1957-04-08 1963-01-15 Yarrow & Co Ltd Oil burning installations for furnaces
US3199568A (en) * 1961-07-05 1965-08-10 Herbert Baumanns Oil heating appliance

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