EP2762779B1 - Tubular flame burner - Google Patents

Tubular flame burner Download PDF

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Publication number
EP2762779B1
EP2762779B1 EP12836569.9A EP12836569A EP2762779B1 EP 2762779 B1 EP2762779 B1 EP 2762779B1 EP 12836569 A EP12836569 A EP 12836569A EP 2762779 B1 EP2762779 B1 EP 2762779B1
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EP
European Patent Office
Prior art keywords
temperature
injection nozzle
combustion chamber
adjustment gas
gas injection
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.)
Not-in-force
Application number
EP12836569.9A
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German (de)
English (en)
French (fr)
Other versions
EP2762779A4 (en
EP2762779A1 (en
Inventor
Taihei Nouchi
Jun Ishii
Minoru Asanuma
Kuniaki Okada
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JFE Steel Corp
Original Assignee
JFE Steel Corp
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Filing date
Publication date
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Publication of EP2762779A1 publication Critical patent/EP2762779A1/en
Publication of EP2762779A4 publication Critical patent/EP2762779A4/en
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Publication of EP2762779B1 publication Critical patent/EP2762779B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
    • F23C3/006—Combustion apparatus characterised by the shape of the combustion chamber the chamber being arranged for cyclonic combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
    • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
    • F23D14/24—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other at least one of the fluids being submitted to a swirling motion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/82—Preventing flashback or blowback
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/04—Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air beyond the fire, i.e. nearer the smoke outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
    • F23C2900/03004—Tubular combustion chambers with swirling fuel/air flow

Definitions

  • the present invention relates to a tubular flame burner.
  • a tubular flame burner 10 includes a tubular combustion chamber 11 having an open end, a fuel gas injection nozzle 12, and an oxygen-containing gas injection nozzle 13.
  • the injection nozzles 12 and 13 are each disposed on a closed end side of the combustion chamber 11 so as to be oriented in a direction tangential to the combustion chamber 11.
  • the tubular flame burner 10 forms a tubular flame 14 in the combustion chamber 11.
  • the tubular flame burner 10 is an epoch-making burner that can reduce the size of combustion facility and that can reduce the amounts of hazardous substances, such as NOx, which may increase depending on the combustion conditions; unburned substances, such as hydrocarbon; and environmental pollutants, such as soot and smoke, and the like (see, for example, PTLs 1 and 2).
  • US 4,687,436 A relates to a gasified fuel combustion apparatus which is constructed such that an air chamber connected with a blower is provided to surround a cylindrical combustion chamber having an outer wall made of a heat-resistant material.
  • a fuel supplying tube is provided to open tangentially in a closed end portion of the combustion chamber and a plurality of main air blowing holes of a comparatively large diameter are provided through the outer wall of the combustion chamber at positions adjacent to the fuel supplying tube such that the main air blowing holes are inclined to both of the rotating direction of the fuel and the blowing direction of the combustion flame.
  • auxiliary air blowing holes having a comparatively small diameter are also provided through the outer wall of the combustion chamber at positions downstream from the main blowing holes with orientations similar to those of the main air blowing holes.
  • JP 2005/265394 A and JP 2007/255744 A are further prior art.
  • PTL 1 does not describe a method for adjusting the temperature of the combustion exhaust gas.
  • PTL 2 describes a method for adjusting the temperature of a combustion exhaust gas by disposing a temperature-adjustment gas injection nozzle for injecting a temperature-adjustment gas on an open end side of a combustion chamber and by injecting the temperature-adjustment gas from the nozzle.
  • a flame failure extentinguishment of combustion
  • An object of the present invention which has been achieved under the circumstances described above, is to provide a tubular flame burner that can appropriately adjust the temperature of a combustion exhaust gas and that can continue a stable combustion in a case where the tubular flame burner is used as a hot-blast generating device or the like.
  • the present invention has the following characteristics.
  • the tubular flame burner according to the present invention can appropriately adjust the temperature of a combustion exhaust gas and can continue a stable combustion in a case where the tubular flame burner is used as a hot-blast generating device or the like.
  • Fig. 1 illustrates a conventional tubular flame burner described in PTL 1.
  • Fig. 2 illustrates a tubular flame burner 10A having a temperature-adjustment gas injection nozzle, on which an embodiment of the present invention is based.
  • the tubular flame burner 10A corresponds to a tubular flame burner described in PTL 2 cited above.
  • the tubular flame burner 10A of Fig. 2 includes a tubular combustion chamber 11 having an open end, a nozzle for injecting a fuel gas (fuel gas injection nozzle) 12, and a nozzle for injecting an oxygen-containing gas (oxygen-containing gas injection nozzle) 13.
  • a fuel gas fuel gas injection nozzle
  • oxygen-containing gas oxygen-containing gas injection nozzle
  • Each of the nozzles 12 and 13 is disposed on a closed end side of the combustion chamber so as to be oriented in a direction tangential to an inner wall surface of the combustion chamber 11.
  • the tubular flame burner 10A forms a tubular flame 14 in the combustion chamber 11.
  • the tubular flame burner 10A further includes a nozzle for injecting a temperature-adjustment gas (temperature-adjustment gas injection nozzle) 16 for injecting a temperature-adjustment gas 17 for adjusting the temperature of a combustion exhaust gas 19.
  • the temperature-adjustment gas injection nozzle 16 is disposed on the open end side of the combustion chamber 11 so as to be oriented in a direction tangential to the inner wall surface of the combustion chamber 11.
  • the tubular flame burner 10A is capable of adjusting the temperature of the combustion exhaust gas 19 by injecting the temperature-adjustment gas 17 from the temperature-adjustment gas injection nozzle 16 and mixing the combustion exhaust gas 19 with the temperature-adjustment gas 17.
  • the tubular flame burner 10A occasionally caused a flame failure (extinguishment of combustion) when the temperature-adjustment gas 17 having a low temperature (such as room temperature) was injected in a certain amount or more. Moreover, it was observed that a smaller amount of the temperature-adjustment gas 17 caused a flame failure in a case where the fuel gas had a low heating value and the tubular flame 14 had a large length.
  • the inventors examined the cause of the flame failure by performing a combustion test using a combustion test device, a numerical simulation, and the like. As a result, the inventors found that the flame failure occurs through the following mechanism.
  • the length of the combustion chamber 11 be considerably large relative the diameter D of the combustion chamber 11, provided that mixing of the temperature-adjustment gas 17 is not performed. This is because, a fuel gas, once ignited, can complete combustion without being extinguished, as long as mixing of the temperature-adjustment gas 17 is not performed.
  • a fuel, oxygen, and a gas temperature are three essential factors for a substance to burn.
  • the temperature-adjustment gas 17, which is a gas at room temperature is mixed into the tubular flame 14, the temperature of the tubular flame 14 falls sharply and a flame failure occurs.
  • the temperature-adjustment gas 17 injected from the temperature-adjustment gas injection nozzle 16 in a direction tangential to the inner wall surface of the combustion chamber 11 was supplied to only a region located downstream of the injection position. Therefore, it was not considered that the temperature-adjustment gas 17 might influence a portion of the tubular flame 14 that is located upstream of the injection position (and might extinguish the tubular flame 14).
  • the inventors obtained the following conclusion.
  • In order to mix the temperature-adjustment gas 17 while reliably preventing a flame failure it is necessary to inject the temperature-adjustment gas 17 to a position behind a position at which a fuel gas and an oxygen-containing gas forming the tubular flame 14 have completed combustion and to prevent backflow of the temperature-adjustment gas 17 toward the fuel gas injection nozzle 12.
  • tubular flame burners according to embodiments (a first embodiment and a second embodiment) of the present invention described below.
  • Fig. 3 illustrates a flame burner 10B according to the first embodiment of the present invention.
  • Fig. 4 is a cross-sectional view of the tubular flame burner 10B illustrating a configuration of the temperature-adjustment gas injection nozzle 16.
  • the tubular flame burner 10B according to the first embodiment is configured to prevent backflow of the portion 18 of the temperature-adjustment gas 17 in the upstream direction, which is shown in Fig. 2 .
  • the temperature-adjustment gas injection nozzle 16 is disposed at an angle ⁇ so that the temperature-adjustment gas 17 is injected in a direction that is inclined in the downstream direction at the angle ⁇ with respect to a direction perpendicular to the axis of a tubular combustion chamber 117.
  • the angle ⁇ is in the range of 10° to 60° (10° ⁇ ⁇ ⁇ 60°). It is preferable that the angle ⁇ be in the range of 25° to 60°.
  • the temperature-adjustment gas 17 may be injected in a direction that is inclined in the downstream direction at the angle ⁇ by, instead of disposing the temperature-adjustment gas injection nozzle 16 so as to be inclined at the angle ⁇ , providing a mechanism (such as straightening vanes 25) for making the flow of the temperature-adjustment gas 17 be inclined at the angle ⁇ in the adjustment gas injection nozzle 16.
  • the tubular flame burner 10B prevents backflow of the temperature-adjustment gas 17 by injecting the temperature-adjustment gas 17 at an injection angle that is inclined in the downstream direction by a predetermined angle ⁇ (10° ⁇ ⁇ ⁇ 60°).
  • ⁇ 10° ⁇ ⁇ ⁇ 60°
  • a single temperature-adjustment gas injection nozzle 16 injects the temperature-adjustment gas 17 in a direction tangential to the inner wall surface of the combustion chamber 11.
  • the temperature-adjustment gas injection nozzle 16 may be configured in a different manner.
  • Fig. 5 illustrates a tubular flame burner 10B 1
  • Fig. 6 is a cross-sectional view of the tubular flame burner 10B 1 taken along a plane passing through temperature-adjustment gas injection nozzles 16.
  • a plurality of (three, in Fig. 6 ) temperature-adjustment gas injection nozzles 16 may inject the temperature-adjustment gas 17 in directions tangential to the inner wall surface of the combustion chamber 11.
  • Fig. 7 illustrates a tubular flame burner 10B 2
  • Fig. 8 is a cross-sectional view of the tubular flame burner 10B 2 taken along a plane passing through temperature-adjustment gas injection nozzles 16.
  • a plurality of (three, in Fig. 8 ) temperature-adjustment gas injection nozzles 16 may inject the temperature-adjustment gas 17 toward a central part of the combustion chamber 11.
  • Fig. 9 illustrates a tubular flame burner 10B 3
  • Fig. 10 is a cross-sectional view of the tubular flame burner 10B 3 taken along a plane passing through temperature-adjustment gas injection nozzles 16.
  • the combustion chamber 11 may have a portion having a decreasing inside diameter near an end of the tubular flame 14, and a predetermined number of (three, in Fig. 10 ) temperature-adjustment gas injection nozzles 16 may inject the temperature-adjustment gas 17 at the portion toward a central part of the combustion chamber 11.
  • each temperature-adjustment gas injection nozzle 16 may be the same as that of the tubular flame burner 10B ( Figs. 3 and 4 ), which has a rectangular cross section (slit nozzle); or any one of those of the tubular flame burner 10B 1 ( Figs. 5 and 6 ), the tubular flame burner 10B 2 ( Figs. 7 and 8 ), and the tubular flame burner 10B 3 ( Figs. 9 and 10 ), each of which has a circular cross section.
  • the shapes and the number of the temperature-adjustment gas injection nozzles 16 may be appropriately determined so that the temperature-adjustment gas may have a desired flow rate and a desired flow speed.
  • Figs. 11, 12 , and 13 respectively illustrate tubular flame burners 10C, 10D, and 10E according to the second embodiment of the present invention.
  • the tubular flame burners 10C, 10D, and 10E actively accelerate combustion of the tubular flame 14 so that a burnout position at which combustion is completed is moved upstream from a position at which combustion is completed naturally, and the temperature-adjustment gas injection nozzle 16 is disposed downstream of the burnout position.
  • a turbulence generating mechanism 20 is disposed at a position downstream of the tubular flame 14 and upstream of the temperature-adjustment gas injection nozzle 16. By doing so, oxygen and a fuel gas are mixed with each other at a high temperature and combustion is accelerated and forcibly completed without allowing the temperature of the tubular flame 14 to fall due to backflow of the temperature-adjustment gas 17.
  • the tubular flame burner 10C illustrated in Fig. 11 has an orifice 21 as the turbulence generating mechanism 20.
  • the tubular flame burner 10D illustrated in Fig. 12 has a grid (mesh) 22 as the turbulence generating mechanism 20.
  • the tubular flame burner 10E illustrated in Fig. 13 has a packed bed 23 (including, for example, sintered ceramic balls) as the turbulence generating mechanism 20.
  • the turbulence generating mechanism 20 is disposed downstream of the tubular flame 14. Accordingly, without increasing the length of the combustion chamber 11, it is possible to appropriately adjust the temperature of the combustion exhaust gas 19 while reliably preventing a flame failure.
  • a single temperature-adjustment gas injection nozzle 16 injects the temperature-adjustment gas 17 in a direction tangential to the inner wall surface of the combustion chamber 11.
  • the temperature-adjustment gas injection nozzle 16 may be configured in a different manner.
  • a plurality of (three, in Fig. 15 ) temperature-adjustment gas injection nozzles 16 may inject the temperature-adjustment gas 17 in directions tangential to the inner wall surface of the combustion chamber 11. It is not necessary that the temperature-adjustment gas be injected in a direction tangential to the inner wall surface of the combustion chamber 11.
  • a plurality of (three, in Fig. 16 ) temperature-adjustment gas injection nozzles 16 may inject the temperature-adjustment gas 17 toward a central part of the combustion chamber 11.
  • each temperature-adjustment gas injection nozzle 16 may be the same as any one of those of the tubular flame burner 10C ( Figs. 11 and 14 ), the tubular flame burner 10D ( Figs. 12 and 14 ), and the tubular flame burner 10E ( Figs. 13 and 14 ), each of which has a rectangular cross section (slit nozzle); or any one of those of Figs. 15 and 16 , each of which has a circular cross section.
  • the shapes and the number of the temperature-adjustment gas injection nozzles 16 may be appropriately determined so that the temperature-adjustment gas may have a desired flow rate and a desired flow speed.
  • a fuel gas used in the present invention is not particularly limited. However, the present invention provides a greater advantage in a case where a low-heating-value gas, which is more likely to cause a flame failure when the temperature-adjustment gas 17 is injected as illustrated in Fig. 2 , is used as the fuel gas.
  • a low-heating-value gas include gases having heating values in the range of 2510 to 3766 kJ/Nm 3 (600 to 900 kcal/Nm 3 ) and in particular in the range of 2510 to 3347 kJ/Nm 3 (600 to 800 kcal/Nm 3 ) such as a blast furnace gas (BFG), a CDQ gas, an exhaust gas including a small amount of combustible component, and the like.
  • the temperature-adjustment gas injection nozzle 16 be disposed at a position behind a position at which the gases (a fuel gas and an oxygen-containing gas), which form the tubular flame 14, have completed combustion. This position changes depending on the heating value of the fuel gas and the flow speeds of gases in the combustion chamber.
  • the distance L between the position of the fuel gas injection nozzle 12 and the position of the temperature-adjustment gas injection nozzle 16 be in the range of 2.5 to 3.5 times the inside diameter D of the combustion chamber 11. It is more preferable that the distance L be in the range of 2.5 to 3.0 times the inside diameter D, because, in this case, the length of the combustion chamber 11 (burner length) can be decreased.
  • the distance L between the position of the fuel gas injection nozzle 12 and the position of the temperature-adjustment gas injection nozzle 16 be in the range of 3.5 to 6 times the inside diameter D of the combustion chamber 11. It is more preferable that the distance L be in the range of 4.0 to 5.0 times the inside diameter D, because, in this case, the length of the combustion chamber 11 (burner length) can be decreased.
  • a necessary length of the combustion chamber 11 (the length of a combustion zone of the tubular flame) changes depending on the heating value of the fuel gas. In any of the cases, the length of the combustion chamber 11 can be easily decreased with the present invention.
  • the temperature and the feed amount of the temperature-adjustment gas may be appropriately set so that the temperature of the combustion exhaust gas can be adjusted to a desired temperature.
  • the temperature of the preheating gas it is preferable that the temperature of the preheating gas be 500°C or higher and it is more preferable that the temperature be 800°C or higher.
  • the temperature and the feed amount of the temperature-adjustment gas may be set so that the preheating gas can have such a temperature.
  • the temperature-adjustment gas includes a reduction gas such as CO or H 2 .
  • a reduction gas such as CO or H 2 .
  • a blast furnace gas, a converter gas, a coke-oven gas, and the like may be used.
  • a part of a blast furnace gas be extracted and used as the temperature-adjustment gas.
  • Example 1 of the present invention the performance of the tubular flame burner 10B according to the first embodiment of the present invention was examined by using a combustion test device 30 shown in Fig. 17 .
  • the tubular flame burner 10 was attached to a furnace body 31, and a diluted LPG (diluted propane gas, having a heating value of 10042 kJ/Nm 3 (2400 kcal/Nm 3 )) made by diluting LPG (propane gas) with nitrogen at a ratio of ten was used as a fuel gas, and air was used as an oxygen-containing gas.
  • LPG diluted propane gas, having a heating value of 10042 kJ/Nm 3 (2400 kcal/Nm 3 )
  • LPG propane gas
  • air was used as an oxygen-containing gas.
  • the sizes of the fuel gas injection nozzle 12 and the oxygen-containing gas injection nozzle 13 were adjusted so that the injection speeds of the fuel gas and air respectively injected in directions tangential to the inner wall surface of the combustion chamber 11 would be about 9 times the speed of a mixed gas formed in the combustion chamber 11.
  • the temperature-adjustment gas 17 three types of gases, which were a diluted LPG (diluted propane gas) made by diluting LPG with nitrogen at a ratio of ten, nitrogen, and air, were used.
  • the injection amount of the temperature-adjustment gas 17 was set to be the same as the amount of combustion exhaust gas, and the size of the temperature-adjustment gas injection nozzle 16 was adjusted so that the injection speed of the temperature-adjustment gas 17 would be about 9 times the speed of a mixed gas formed in the combustion chamber 11.
  • the inside diameter of the combustion chamber 11 was about 200 mm.
  • the entirety of the tubular flame burner 10 had a length of 3 m so that the influence the injection position of the temperature-adjustment gas could be examined.
  • the combustion exhaust gas discharged from the furnace body 31 is cooled by using a sprinkler device 32 and then discharged from a smokestack 33.
  • the entirety of the furnace body 31 was covered with refractories, and pipes to an upper roof portion and the sprinkler device 32 had a water-cooling structure.
  • An inspection window, an ignition plug, and a luminance detector were disposed at the rear end of the tubular flame burner 10.
  • the tubular flame burner 10 was configured so that supply of propane gas could be instantaneously stopped upon detection of a flame failure by the luminance detector.
  • the temperature-adjustment gas injection nozzle 16 was disposed at an inclination angle ⁇ of 30°, and an experiment was performed in which the distance L from the position of the fuel gas injection nozzle 12 to the position of the temperature-adjustment gas injection nozzle 16 was changed. In the experiment, in order to smooth out the flow of the temperature-adjustment gas 17, four straightening vanes 25 were disposed in the temperature-adjustment gas injection nozzle 16.
  • the fuel gas was changed to a blast furnace gas (having a heating value of 3180 kJ/Nm 3 (760 kcal/Nm 3 )), the temperature-adjustment gas 17 was also changed to the blast furnace gas, the oxygen-containing gas was not changed from air, and the same experiment was performed.
  • Example 2 of the present invention the performances of the tubular flame burners 10C, 10D, and 10E according to the second embodiment of the present invention were examined by using the combustion test device 30 shown in Fig. 17 .
  • the tubular flame burner 10 was attached to a furnace body 31, and a diluted LPG (diluted propane gas, having a heating value of 10042 kJ/Nm 3 (2400 kcal/Nm 3 ) made by diluting LPG (propane gas) with nitrogen at a ratio of ten was used as a fuel gas, and air was used as an oxygen-containing gas.
  • LPG diluted propane gas, having a heating value of 10042 kJ/Nm 3 (2400 kcal/Nm 3 ) made by diluting LPG (propane gas) with nitrogen at a ratio of ten
  • the sizes of the fuel gas injection nozzle 12 and the oxygen-containing gas injection nozzle 13 were adjusted so that the injection speeds of the fuel gas and air respectively injected in directions tangential to the inner wall surface of the combustion chamber 11 would be about 9 times the speed of a mixed gas formed in the combustion chamber 11.
  • the temperature-adjustment gas 17 three types of gases, which were a diluted LPG (diluted propane gas) made by diluting LPG with nitrogen at a ratio of ten, nitrogen, and air, were used.
  • the injection amount of the temperature-adjustment gas 17 was set to be the same as the amount of combustion exhaust gas, and the size of the temperature-adjustment gas injection nozzle 16 was adjusted so that the injection speed of the temperature-adjustment gas 17 would be about 9 times the speed of a mixed gas formed in the combustion chamber 11.
  • the inside diameter of the combustion chamber 11 was about 200 mm.
  • the entirety of the tubular flame burner 10 had a length of 3 m so that the influence the injection position of the temperature-adjustment gas could be examined.
  • the combustion exhaust gas discharged from the furnace body 31 is cooled by using a sprinkler device 32 and then discharged from a smokestack 33.
  • the entirety of the furnace body 31 was covered with refractories, and pipes to an upper roof portion and the sprinkler device 32 had a water-cooling structure.
  • An inspection window, an ignition plug, and a luminance detector were disposed at the rear end of the tubular flame burner 10.
  • the tubular flame burner 10 was configured so that supply of propane gas could be instantaneously stopped upon detection of a flame failure by the luminance detector.
  • Example 1 in order to examine the performance of the tubular flame burner 10A, on which the second embodiment of the present invention is based, an experiment was performed in which the distance L from the position of the fuel gas injection nozzle 12 to the position of the temperature-adjustment gas injection nozzle 16 was changed.
  • Example 1 in a case where the distance L was 2.5 times the inside diameter D of the combustion chamber 11, a flame failure occurred as soon as the temperature-adjustment gas (air) was mixed. After the temperature-adjustment gas (air) was mixed, it was not possible to ignite by using the ignition plug. In a case the distance L was 3 times the inside diameter D of the combustion chamber, when the temperature-adjustment gas (air) was injected, combustion occurred but continued for only 20 minutes or shorter, and it was necessary to reignite after a flame failure occurred.
  • combustion continued when the temperature-adjustment gas (air) was injected, and stable combustion continued for at least for 60 minutes. Also in a case where the distance L was 4 times the inside diameter D of the combustion chamber 11, stable combustion continued for 60 minutes or longer.
  • the turbulence generation mechanism 20 (orifice 21, grid 22, or packed bed 23) was disposed immediately upstream of the temperature-adjustment gas injection nozzle 16, and an experiment was performed in which the distance L from the position of the fuel gas injection nozzle 12 to the position of the temperature-adjustment gas injection nozzle 16 was changed.
  • a ring-shaped ceramic plate having a hole having an inside diameter of 120 mm was used as the orifice 21. Due to the presence of the orifice 21, the cross-sectional area of a flow path in the combustion chamber 11 was decreased by half in a part of the combustion chamber 11 and the pressure loss increased.
  • the grid 22 was made of a ceramic and had eight bars. Due to the presence of the grid 22, the cross-sectional area of the flow passage in the combustion chamber 11 decreased in a part thereof.
  • the packed bed 23 included five layers of sintered ceramic particles each having an inside diameter D that was 1/10 of the diameter of the combustion chamber 11.
  • the fuel gas was changed to a blast furnace gas (having a heating value of 3180 kJ/Nm 3 (760 kcal/Nm 3 )), the temperature-adjustment gas 17 was also changed to the blast furnace gas, the oxygen-containing gas was not changed from air, and the same experiment was performed.
  • tubular flame burners 10C, 10D, and 10E in the case where the distance L was 3 times the inside diameter D of the combustion chamber 11, combustion continued for 60 minutes or shorter. In any of the cases where the distance L was 3.5 times, 4 times, 5 times, and 6 times the inside diameter D of the combustion chamber, stable combustion continued for 60 minutes or longer.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
  • Combustion Of Fluid Fuel (AREA)
  • Air Supply (AREA)
EP12836569.9A 2011-09-28 2012-09-28 Tubular flame burner Not-in-force EP2762779B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2011211719 2011-09-28
JP2011211718 2011-09-28
JP2012185991 2012-08-27
PCT/JP2012/006226 WO2013046708A1 (ja) 2011-09-28 2012-09-28 管状火炎バーナー

Publications (3)

Publication Number Publication Date
EP2762779A1 EP2762779A1 (en) 2014-08-06
EP2762779A4 EP2762779A4 (en) 2015-08-26
EP2762779B1 true EP2762779B1 (en) 2019-02-27

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Application Number Title Priority Date Filing Date
EP12836569.9A Not-in-force EP2762779B1 (en) 2011-09-28 2012-09-28 Tubular flame burner

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Country Link
EP (1) EP2762779B1 (zh)
JP (1) JP5704248B2 (zh)
KR (1) KR101595678B1 (zh)
CN (1) CN103857961B (zh)
TW (1) TWI524039B (zh)
WO (1) WO2013046708A1 (zh)

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ITUD20130167A1 (it) * 2013-12-06 2015-06-07 Univ Degli Studi Trieste Bruciatore ad irraggiamento
CN112684099B (zh) * 2020-12-18 2022-09-09 郑州大学 一种组装式湍流火焰熄灭装置

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JP5704248B2 (ja) 2015-04-22
KR20140067090A (ko) 2014-06-03
CN103857961A (zh) 2014-06-11
CN103857961B (zh) 2016-11-23
TW201314131A (zh) 2013-04-01
EP2762779A4 (en) 2015-08-26
TWI524039B (zh) 2016-03-01
JPWO2013046708A1 (ja) 2015-03-26
WO2013046708A1 (ja) 2013-04-04
KR101595678B1 (ko) 2016-02-18
EP2762779A1 (en) 2014-08-06

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