JPS59500925A - heat transfer burner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] heat transfer burner Background of the invention The present invention burns fuel and air at a rich fuel/air ratio in the central burner tube, while the outer burner The fuel and air at a lean fuel/air ratio are burned in the tube, and the flame is brought together to form the final flame tube. Concentric pressure forming body, reducing NOx emissions and improving flame brightness The present invention relates to a heat transfer type fluid fuel burner comprising a shaped burner.

The use of natural gas fuel and other gaseous fuels for heating eliminates the need for petroleum. or less expensive than using coal and other similar fuels, but Natural gas fuels tend to produce low brightness flames.

High flame brightness is desirable to increase radiant heat transfer from the flame. In addition , as the temperature of the flame resulting from the mixture increases, additional NOx emissions are produced. live. Once the combustion air has been preheated before mixing with the fuel, a conventional heated air bar With burners and heat transfer burners, the flame brightness decreases as the air temperature increases. Ru. In high temperature applications, where most of the heat transfer is by radiation, It is undesirable for the gas flame to have a translucent blue color. Therefore, the heat transfer For example in the primary metal processing industry and glass manufacturing industry where a high radiation content is desirable. For high temperature applications, conventional natural gas burners are usually considered impractical. There is.

The lean and rich fuel mixtures are burned separately at low flame temperatures and the rich After a part of the air-fuel mixture has completed combustion, the flames are combined and the high-temperature flame is used to remove NOx. It is known to reduce discharge. Existing low NOx buffer with staged combustion Most burners are of the continuous type, e.g. by feeding a lean mixture into the first stage of the burner. It is injected and combusted to provide additional fuel downstream of the first stage combustion zone. under different circumstances In this case, a rich mixture is first injected into the burner, and additional fuel is injected downstream of the first stage combustion zone. supply fees. This is a continuous arrangement and the combustion products of the first stage are gradually cooled. This reduces the flame temperature and reduces the chance of thermal NOx formation. by this, Due to the use of oxygen in the rich and lean flames, the acid that burns in the final flame Since the amount of oxygen in the final flame decreases, free oxygen reacts with the oxygen in the final flame. The amount of will decrease and you will win. In general, both lean and rich flame temperatures are Should be kept below 1538°C (2,800'F) and avoid excessive NOx emissions It is.

Therefore, preheating the combustion air increases the flame temperature and the flame temperature reaches the desired value. A dangerous situation arises in which the temperature exceeds that level.

If ultra-lean and ultra-rich mixtures are used in the staged combustion chamber, the combustion air Even when heated, the flame temperature is kept below the desired value to prevent NOx emissions be able to. In the rich mixture chamber, free F4. Only a small amount of oxygen was supplied Therefore, there is no risk of NOx emissions forming. Due to excess air in the lean mixture chamber , more air can be used due to lower flame temperature.

Summary of the invention Briefly, the invention provides a rich mixture to the inner tube and a lean mixture to the outer tube. A burner arrangement having a pair of burner tubes arranged concentrically together with a device for feeding the tubes. It is growing. A flow divider is installed at the discharge end of the burner tube to direct the outer concentric flame to the center flame. Point the flames inward so that the flames come together. Exhaust gas from the room where the flame was directed The combustion air is exhausted via the flue duct surrounding the burner tube, and the combustion air is passed through the exhaust gas duct. from the burner tube and the exhaust gas conduit. This allows the heat to be recovered by the introduced combustion air.

The mixture and flame temperature in the burner tubes should be adjusted to minimize the formation of NOx components and to reduce the flame brightness. carefully controlled to improve

Thus, an object of the present invention is to minimize the formation of NOx components and increase flame brightness. A fluid fuel burner constructed and arranged is provided.

Another object of the present invention is to utilize a pair of concentric burner tubes to create There are separate flames produced by a rich mixture and flames produced by a lean mixture. 7.Then, the flames are brought together to minimize the formation of NOx. To provide a heat transfer type gas burner that increases flame temperature and flame brightness while increasing flame temperature and flame brightness. That's true.

Another object of the invention is that it is relatively inexpensive to manufacture and maintain, and that it Multiple burner chambers and fuel nozzles that can be conveniently modified to adjust fuel supply The heat generated from the burner and the combustion air introduced by the exhaust gas from the heating chamber An object of the present invention is to provide a burner for fluid fuel, which is equipped with a heat transfer duct for preheating air.

Other objectives 5 features and advantages of the invention can be found in the following description with reference to the accompanying drawings. This will make it clear.　′ Brief description of the drawing Figure 1 is a side sectional view of the bath and a sectional view of the heat transfer device; Figure 2 is a detailed view of the burner fuel nozzle; Figure 3 is a detailed view of the burner fuel nozzle; 4 is a horizontal cross-sectional view of the heat transfer device of FIG. 4 taken along line 4--4 of FIG. 1. It is.

detailed description Throughout the several drawings, like numerals refer to drawings showing similar parts in more detail. Then, FIG. 1 shows a mounting in which the annular mounting plate 12 extends radially from the cylinder 11. A fluid fuel burner with a cylinder 11 is shown t7.

The mounting plate 12 attaches the burner to a support element such as a furnace wall or ladle heater, etc. It has an opening 4 into which a connecting screw (not shown) that can be inserted is inserted.

An annular support flange 15 projects radially inward from the end edge of the mounting cylinder 11. Extending inwardly, the cast ceramic insulation sleeve 16 fits within the mounting cylinder 11. and abuts against the inner protruding annular flange 15.

The burner body 18 is generally cylindrical and is adjacent to the annular flange 15 of the mounting cylinder 11. a radially outwardly projecting mounting located at and connected to said flange 15 by bolts 20; A flange 19 is provided. The other end of the burner body 18 is provided with an inner protruding wall 21. There is. The heat transfer sleeve 22 is also generally cylindrical in shape and includes an outer casing 24, an annular shaped wall 25, intermediate casing 26, inner casing 27 and supply plate 28. Be prepared. Between the flanges 15 and 19 is an annular flange 2 that projects radially outward. 9 is located, and the position 1 is determined by bolt 201c.

The nozzle mounting plate L/-) 31 is located parallel to the supply plate 28 and is secured with bolts 32. It is attached to the wall 21 of the burner body 18. The cylindrical insert body 34 has one end connected to a nozzle. The mounting grate 31 has a diameter and length that is approximately the same as the middle of the heat transfer sleeve 22. The size is such that it can be inserted between the casing 26 and the inner casing.

The upper part of the burner body 18 has an opening 35, and the upper part of the heat transfer device sleeve 22 has an opening 3. 6, through which the incoming combustion air and the outgoing flue gas pass, respectively. . As will be explained in more detail below, the area around openings 35 and 36 is A heating device 3B is provided to direct combustion air and exhaust gases.

A cylindrical collar 40 extends outwardly from the nozzle mounting plate 31 and has radially projecting flanges. 41.

Gas manifold plate 42 and its flange 43 are attached to collar 40. This allows a gas supply plenum chamber 44 to be formed. nozzle mounting plate The space 45 between 31 and supply plate 28 comprises a combustion air plenum chamber.

The heat insulating plate 46 is in contact with the supply plate 2B, and is in contact with the heat transfer device sleeve. A pair of concentric cylindrical burner tubes 48 and 49 are located concentrically within 22, with each bar One end of the tube fits into a circular bay formed in the insulation plate 46. outer bar A ceramic fireproof insulation material 50 is provided around the outer burner tube 49 and the outer burner tube 49. and the inner casing 27 of the heat transfer device sleeve 22. Ru.

The other ends of burner tubes 48 and 49 are provided with support stars (FIGS. 1 and 3). , forming an annular groove into which the other end of the burner tube is inserted. Support star shape 51 is cast ceramic A heat insulating sleeve 160 made of wood has a radial protrusion 52 that comes into contact with the cylindrical inner surface, and therefore, An exhaust gas opening 54 is formed between the star 51 and the heat insulating sleeve 16. supporting star shape An annular row of flame outlet openings 55 is formed within 51 and is concentric with respect to the row of openings 55. A central flame exhaust opening 56 is provided. The central flame exhaust opening 56 is a burner pipe. 48 to the outside of the burner to form a tapered Venturi nozzle. The velocity of the combustion gases discharged from the central burner tube 48 is increased. Similarly, the flame exhaust opening The mouth part 55 is angled toward the central vertical axis of the burner, and the mouth part 55 is arranged at an angle toward the central vertical axis of the burner. The cross section gradually decreases toward the outside of the accelerates the flame speed as it exits the outer burner tube, and transfers the flame exiting from the outer burner tube to the inner burner tube. Guide it inward toward the flame coming out of the tube.

As shown in FIG. 2, a plurality of fuel nozzle assemblies are arranged around the central longitudinal axis 58 of the burner. 59 are arranged in an annular array, each fuel nozzle assembly 59 being connected to a fuel supply plenum chamber. 44, nozzle mounting plate 31, combustion air plenum chamber 45, supply grate 28 and The annular strip formed between the inner and outer burner tubes passes through the It is growing within the pace. Similarly, the burner shaft 58 includes an annular array of fuel nozzles. A larger single fuel nozzle assembly 60 is centrally located within volume 59 and includes a nozzle. Zulu mounting plate 31, combustion air plenum chamber 45, supply plate 28 and insulation It extends through the grate 46 and into the inner burner tube 48 .

Each nozzle assembly 59 and 60 is connected from the nozzle mounting plate 3 to the supply plate 28. The outer mounting pipe 61 extends up to a ceramic sleeve 62 abutting the sleeve 6, extending through the sleeve opening and serving Nozzle conduit 64 protruding through feed plate 46 , on the raised end of nozzle conduit 64 The nozzle element 65 attached to the nozzle conduit 64 was positioned so as to contact the other end of the nozzle conduit 64. an orifice disk 66 and a nozzle guide extending around the orifice disk 66; A nozzle cap 68 is provided which is screwed onto the raised rear end of the tube 64. nozzle cap The cup 68 has a gas opening 69 and the orifice disk 66 has a fuel opening 69 and a fuel opening 70 aligned with an opening 71 extending through the nozzle conduit; ing. Similarly, nozzle element 65 communicates with passageway 71 through nozzle conduit 64. A fuel opening 72 is provided. For this reason, the fuel supply pre-nano, from the chamber 44 to each nozzle. natural gas through the tube assemblies 59 and 6o into the tubular burners 48 and 49. A fuel passage for such fuel to pass through is formed.

The cross-sectional area of the passageway extending through the nozzle assemblies 59 and 6o is increased so that the nozzle If it is desired to increase or decrease the flow rate of fuel through the assembly, the end of the nozzle conduit 64 Remove the nozzle cap 68 from the section, and remove the orifice disk 70 from the cap. , insert a new orifice disc, and reinstall the cap onto one end of the nozzle conduit. Replacing the orifice disk 66 with another orifice disk by attaching the Can be done. ρ to the nozzle assembly Since this adjustment is made after the nozzle assembly, There is no need to remove the nozzle assembly from the burner tube during adjustment.

An insulating plate 46 also extends through the plate 46 and extends along the inner surface of the insulating plate. with air passages 74 and 75 communicating with the inner and outer burner tubes, respectively. ing. Each supply plate 28 has a graduated opening that mates with passages 74 and 75. The combustion air plenum chamber 45 is provided with ports 76 and 77 and thus the combustion air plenum chamber 45 is connected to the supply plate 2. 8 and a heat insulating plate 46 to communicate with burner tubes 48 and 49 .

As shown in FIGS. 1 and 4, a convection heat transfer device 3B is installed on the top of is the installation. The convective heat transfer device 38 includes a rectangular outer casing 78 and an outer casing 78. An inner casing 79 extends through the casing 78. outer casing The housing 78 and inner casing 79 are connected at their upper ends by an upper mounting plate 80. The mounting plate forms an opening 81 that communicates with the upper end of the inner casing 79. to be accomplished. An outer lower mounting plate 82 is provided on the outer casing 78 and It comes into contact with the outer surface of the casing 79. The inner lower part is attached to the descending starting end of the inner casing 79. Mounting plate 83 is installed on the car. The intake collar 84 is attached to the upper mounting plate 81. It opens into the adjacent outer casing 78, and the inner horizontal partition 85 connects the outer casing. The upper end of 78 is separated from its lower part and the heat exchanger is separated around inner casing 79. An intake plenum chamber 86 is formed at the upper end.

A first group of vertically extending conduits 88 connects the inner casing 79 at its L-shaped end. It communicates with the intake plenum chamber 86 at the top of the partition 85, and the inner casing 79. extends downward through the inner casing 79, bends at its lower end, and extends downward through the inner casing 79. , of the heat exchange chamber 89 located between the outer sink 78 and the inner casing 790. It communicates with the bottom. Smoke conduit 90 extends vertically and concentrically through first vertical conduit 88 are doing. Similarly, the second group of vertical conduits 91 are located in the inner casing immediately below the partition 85. through the groove 79, opening at its upper cursive end and communicating with the upper end of the heat exchange chamber 89. passes through the inner casing 79, extends downward, bends its lower end, and opens the inner casing. It communicates with the bottom of the lower mounting plate 82 through the lower end of the casing 79 .

As shown in FIG. 1, the lower outer mounting plate 82 is attached to the burner body 18. The lower inner mounting plate 83 is attached to the heat transfer device sleeve 22.

For this purpose, the inner casing 79 communicates with the heat transfer device sleeve 22 to The convection type heat transfer device 38 receives the exhaust gas and directs the exhaust gas as shown by the arrow 94. The outer casing 78 communicates with the burner body 18 and is directed upwardly through the arrow 1. ) 5, the incoming combustion air is directed through the intake collar 84 and into the inner casing. discharge from the lower end of the ring 79.

action When operated as a burner, natural gas or other fluid fuels are heated to a pressure higher than atmospheric pressure. , by a conduit (not shown) connected to the collar of the gas manifold 42. , to the fuel supply plenum chamber 44, where the gas is supplied to each fuel nozzle at a nearly uniform pressure. into assembly 59 and 60. fuel moves through the nozzle assembly t2; into the closed ends of the inner burner tube 48 and the outer burner tube 49.

Note that the combustion air moves through the convection heat transfer device 38 at a pressure higher than atmospheric pressure, and an annular shape formed between the inner casing 240 of the heat exchanger sleeve 22 and the outer casing 240 of the heat transfer device sleeve 22; Enter space 94. Air is directed to the heat transfer sleeve 22 as indicated by arrow 95. the outer ring between the intermediate casing 26 and the nozzle mounting plate 310 and the cylindrical insert 34; The cylindrical insert is then suctioned to move along the length of the cylindrical space 96. 34 and the inner casing 2 of the cylindrical insert 34 and the flue sleeve 22 7 through an annular passage 97 formed between the Combustion air moves into the plenum chamber through openings 98 around the periphery of the lenum chamber 45. do. This allows the incoming combustion air to be preheated as it approaches the combustion air plenum chamber. Ru. The air then passes through air passages 74-- and 75 to burner tubes 48 and 75. 49, the air mixes with the fuel in the burner tube.

The fuel-air ratio between natural gas and the air injected into the outer burner pipe 49 is 0.03 to 0.0. On the other hand, the fuel injected into the inner burner pipe 48 and the air are in a diluted state. It is desirable that the ratio be in a relatively rich state between 0.25 and 0.4. burning sky The temperature of the incoming combustion air moving through the air plenum chamber 45 is determined by The temperature will be approximately 760°C (below 1,400°C) before supplying. between the inner and outer burner tubes The temperature of the flame generated in the formed annular dilution chamber 100 is 1482°G (2,700″ ``F) Adjust so that it is as follows.This adjustment changes the pressure of the introduced air and fuel. This is done by changing the fuel-air ratio. In the annular dilution chamber 100, almost all of the fuel Complete combustion takes place.

The temperature of the flame formed in the rich chamber 101 located in the center is approximately 1316°G. (2,400”F), and incomplete combustion takes place in the central chamber. Flame temperature is controlled by varying the fuel-air ratio.

As the flame from the central chamber and the annular chamber exits the open end of the burner tube, the supporting star 51 directs the flame from the annular chamber 100 between the inner and outer burner tubes to the inner burner tube. The support star acts as a deflection means to deflect the flame coming from the inner chamber 101 of the The flame exhaust opening 55 of the mold tapers from near the burner tube to the outside of the burner, and has a cross section. becomes smaller and therefore the flame tapers as it moves through the flame exhaust opening 55. Its velocity is accelerated by the central flame exhaust opening 56 of. Fire from burner 10 When the flames come out, the flames come together and the unburned fuel from the central flame is transferred from the outer annular flame. The fuel is mixed with unburned oxygen, and complete combustion of the fuel is completed at the tip of the burner. Temperature of hybrid flame The temperature is high, approximately 1927°G (below 3,500°C), and the brightness is similar to that of an oil flame. Get closer.

The combustion gases discharged from the flame projecting chamber (not shown) are indicated by arrow 104. As shown, the exhaust gas formed between the star shape and its cast ceramic insulation sleeve 16 returns around the support star 51 through the opening 54 and moves into the broken annular passage 105; It then travels through the cylindrical baffle plate 106 and exits the outlet opening of the heat transfer device sleeve 22. The air is evacuated from section 36 and travels upwardly through convective heat transfer device 38 . exhaust gas The temperature of the gas on entering the annular passage 105 is typically between 982°C (1,800°F) and It will range from 2,400"F to 1316C (2,400"F).

The flame temperature in the central rich chamber 101 is approximately 149°C ( You can see that the temperature is low (300''F). Therefore, heat transfer is carried out in the outer annular dilution chamber. 100 into the inner rich chamber 101. Furthermore, the outer burner pipe 4 9 and the heat transfer device sleeve 22 through a heat insulating material 50 and a conductor from the outer burner tube 49. and the incoming combustion air travels through passages 96 and 97 and passes through the heat transfer device sleeve. As it exits from 22, heat will be absorbed by the incoming combustion air. moreover , the annular space 94 through which the incoming combustion air travels is connected to the combustion chamber of the annular passage 105. Enclose the part through which the burning gas moves. Therefore, the heat from the exhaust gas is transferred is transmitted to the incoming combustion gas.

While the disclosed embodiments specify a cylindrical burner tube, other shapes of burners may be utilized. It should be understood that it can be used. Furthermore, the disclosed embodiments Natural gas is used as fuel, but natural gas, synthetic gas, fuel oil, and pulverized coal are also used. Any flammable and fluid fuel can be used, including The inner burner uses fuel oil with a rich fuel/air ratio, and the outer burner uses fuel oil with a lean fuel/air ratio. It is possible to use different types of fuel at the same time, such as using natural gas. Wear.

Although the invention has been described in detail with particular reference to preferred embodiments, Variations and modifications may be made within the spirit and scope of the invention as defined in the appended claims. It will be understood that modifications may be made.

(Contents) Kowoe 7: Shino Procedural amendment (formality) March 1980 K-day Commissioner of the Patent Office Wakasugi Aio 1. Indication of case International application number PCT/US831007782, name of invention Name: heat transfer burner 3. Person making the amendment Relationship to the incident: Patent applicant Address (Residence) Bray, Drapyle Clearview, Georgia, United States Su 2845 Name (Name) The Cadre Corporation Representative Antz ≠ James Gi 10 Nationality United States 4. Agent postal code 105 Telephone: Tokyo (504) 3075/3076/3077 6 Subject to correction (]) (Document pursuant to the provisions of Article 184-5, Paragraph [] of the Patent Law) Representative of the patent applicant (2) Translation of an international application based on the Patent Cooperation Treaty (3) Translation of the specification (4) Translation of the scope of claims (5) Translation of drawings (6) Power of attorney and its translation 7. Contents of correction (1) As per the attached sheet (no changes other than those stated in the subject of amendment) (2) As per the attached sheet (3) Translation of the specification (no change in content) (4) Translation of the scope of claims (no change in content) (5) Engraving of drawing (no change in content) (6) Submission of power of attorney and its translation 8 List of attached documents (1) Gensho--4 fields and sweats: 1st bamboo, 5 legs, 1 layer, 1 arm, 1 bow] 2) One translation of the international application application based on the Patent Cooperation Treaty (3) Translation of the specification 1 letter (4) One translation of the scope of claims (5) Drawing 1 copy (6) Power of attorney and the same translation: one copy each (2)

Claims (1)

[Claims] 1. Comprising a central burner pipe and an outer burner pipe surrounding the central burner pipe, with a front The central burner tube and the outer burner tube are closed at one common end by a heat dissipation plate. and an air supply having the other end open and located adjacent to the supply plate. a plenum chamber and an air supply from the plenum chamber through the supply plate to the central an air passageway extending into the burner tube and the closed end of the outer burner tube; the air supply plenum chamber surrounding the inner pipe and communicating with the wall air supply plenum chamber; an air supply conduit that moves air up to an exhaust flue for moving gas around and away from the burner; and extending into the closed ends of the central burner tube and the outer burner tube; and a fuel supply nozzle for supplying fuel to the burner pipe, whereby the desired view is Directed to the burner tube through the supply conduit and produced from the exhaust flue and the outer burner tube. Preheated by shear heat, the fuel is directed through the fuel supply nozzle and into the burner tube. The gas and air are mixed in the burner tube, ignited, and discharged from the discharge end of the burner tube. and the flue gases are exhausted through the exhaust flue to heat the incoming air. A heat transfer type burner characterized by a sea urchin. 2. The fuel supply nozzle and the air passage are rich relative to the central burner pipe. and configured to provide a lean fuel-air ratio to the outer burner tube. Claim 3, characterized in that the fuel supply nozzle and and the air passageway is at a temperature lower than the temperature of the flame formed in the outer burner tube. and configured and arranged to form a flame within the central burner pipe. Claim 1: A burner as described. 4. The air supply conduit surrounds a portion of the exhaust flue, so that heat is transferred to the exhaust flue. Claim 1, characterized in that the gas is transmitted from the gas to the introduced air. Burner listed. 5. Further, a fuel supply plenum chamber located adjacent to the air supply plenum chamber. wherein the fuel supply nozzle passes through the air supply plenum chamber to extending from the plenum chamber into the closed end of said burner tube 5 whereby fuel is At the nozzles, the fuel is supplied to all the fuel supply nozzles at almost uniform pressure. A burner according to claim 1, characterized in that: 6. At least two substantially concentric burner tubes and said burner tubes in lean fuel/air ratio conditions. a device for supplying fuel and air to one end of one burner tube of the burner tubes; supplying fuel and air to one end of another of the burner tubes in a ratio state; and, at the other end of the burner tube, a device for combining the flames from the burner tube. A burner characterized by comprising: 7. In a lean fuel/air ratio state, inject fuel into one end of one of the burner pipes. and the air supply device is approximately 0.03 to 0.05 to the outer cylindrical bar and tube. one of the burner tubes in a rich fuel-air ratio condition. One end of the burner tube is such that the device for supplying fuel and air is approximately approximately connected to the inner burner tube. Claim 6, characterized in that it provides a fuel-air ratio of between 0.025 and 0.5. burner. 8. The burner tube is cylindrical and coaxial, and further the outer cylindrical burner tube an exhaust flue extending around the burner tube to exhaust flue gas around the burner tube; Additionally, an air supply extending around the exhaust flue and directing air to the cylindrical burner tube. 7. A burner as claimed in claim 6, characterized in that it comprises a conduit. 9. Further, a closed supply plate at one end of each burner tube, and said supply plate. an air supply plenum chamber located adjacent to the air supply plate; an air passageway extending from the air supply plenum chamber to a closed end of the burner tube; a fuel-supply plenum chamber located adjacent to the air supply plenum chamber; and a fuel-supply plenum chamber located adjacent to the air supply plenum chamber; from the fuel supply plenum chamber through the plenum chamber and into the closed end of the burner tube. Claim 6, characterized in that the fuel supply nozzle is provided with an elongated fuel supply nozzle. burner. 10, further K, surrounding the exhaust flue surrounding the burner tube and the former exhaust flue; 7. A burner as claimed in claim 6, characterized in that it comprises an air supply conduit. 11. The device that combines the flames from the burner tubes removes the flames generated inside the outer burner tubes. A flame diverter is provided on the inside to direct the flame generated in the inner burner tube. A burner according to claim 6. 12□ The flame shunt holds the pass tubes in a concentric state spaced apart from each other. Claim 11, characterized in that the star-shape is constructed and arranged so as to Burner listed. 13. Method for reducing NOx emissions and increasing flame brightness of gas combustion burner In this case, fuel is supplied in the first burner pipe of a pair of concentrically arranged burner pipes. and a step of burning air at a rich fuel/air ratio, and a pair of concentrically arranged bulbs. The fuel and air are combusted at a lean fuel-air ratio using the internal pressure of the second burner tube. a step in which both the rich and lean mixtures are at least partially combusted and 1 After generating a flame tube, the flames from concentrically arranged burner tubes are combined. The method characterized in that it comprises the steps of: 14. In each stage of bringing the flames together, the flames are brought together at the tip of the burner tubes arranged concentrically. protrudes, and in the final flame cylinder, one flame is caused by the other flames to become ( The method according to claim 13, characterized in that the method is characterized in that if the method is . 15.Furthermore, fuel to be supplied to the burner tube? The final flame is controlled by adjusting the fuel-air ratio of Claim 13, further comprising a step of changing the brightness of the cylindrical body. The method described. 16. A stage for burning fuel and air at a rich fuel-air ratio in the first burner pipe The floor supplies fuel and air to the first burner tube at a ratio of approximately 0.25 to 0.05 The fuel and air are combusted at a lean fuel-air ratio in the second burner pipe. The step of applying the fuel and air to the second burner tube at a ratio of about 0.03 to 0.05 The method according to claim 13, characterized in that it comprises a step of supplying at a certain rate Law. 17. a first burner chamber means and a second bar generally surrounding said first burner chamber means; fuel and air in a first ratio to the burner chamber means and one of said burner chamber means; means for supplying fuel and air to other means of said burner chamber means; means for supplying a 2g2 ratio of different fuel-air ratios, and said first burner chamber. The means and the second burner chamber means direct their flame into a common space to produce a final fire. A burner characterized in that it comprises a device for forming a flame envelope. 18, wherein said first burner trap means and said second burner chamber means are connected to said central burner chamber and said second burner trap means; a pair of concentric burner tubes forming an annular burner chamber surrounding a central burner chamber; A burner according to claim 17, characterized in that: 19. Fuel and air are supplied to the burner chamber means in the first and second fuel-air ratio states. a supply plate in which said means for supplying 1- abuts a common end of said concentric burner tubes; a fuel plenum chamber formed on a surface of the supply plate opposite to the burner tube; extending from the air plenum chamber into the central burner chamber through a supply plate; from the fuel plenum chamber through the air passageway and the air plenum chamber; characterized by comprising a fuel conduit extending into the central burner chamber and the annular burner chamber. A burner according to claim 18. 20, a first burner chamber means, a second burner chamber means surrounding the first burner chamber; means for supplying a first fuel with air to the inner burner chamber means; and an outer birch chamber. means for supplying the second fuel with air to the means; and first burner chamber means. means for combining the flames from the second bar chamber means to form a final flame tube. A burner characterized by the ability to Engraving (no changes to the letter)