JPH11281015A - Tubular flame burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a high-load combustion and miniaturize a burner and at the same time prevent environmental contamination from occurring easily by providing a nozzle for blowing a premixed air consisting of a combustion gas and a gas containing oxygen to the other end part of a tubular combustion room whose one end is open toward the tangential direction of the inner wall surface. SOLUTION: One end of a tubular combustion room 10 is opened and becomes the exhaust port of a combustion exhaust gas. And, a long slit along the direction of a pipe shaft is formed at the other end part. A nozzle 11 for blowing a premixed air consisting of a combustion gas and a gas containing oxygen is provided while being connected to the slit. The nozzle 11 is arranged toward the tangential direction of the inner wall surface of the combustion room 10, and a turning flow is formed in the combustion room 10 due to the blowing of the premixed air. Also, the nozzle 11 has a flat tip part and a reduced opening area, so that the premixed air can be blown speedily. Since stable flame is formed in a high-speed turning flow, high-load combustion is enabled and also the adjustment range of the amount of combustion is wide, thus miniaturizing a combustion facility.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas burner provided in a furnace or a combustor.

[0002]

2. Description of the Related Art Conventional gas burners used industrially are classified into a diffusion combustion system (external mixing) and a premix combustion system (internal mixing) according to a method of mixing a fuel gas and an oxygen-containing gas. It is roughly divided. Burners of these types are
In any case, the flame is formed ahead of the tip of the burner. In the diffusion combustion method (external mixing), the two gases are mixed and burned at the tip of a burner, and a high-temperature flame can be obtained, which is widely used. In addition, the premixed combustion type has advantages such that a relatively short flame can be formed.

[0003]

However, the above-mentioned conventional burner has several problems, the main ones of which are as follows.

[0004] Since a flame is formed ahead of the tip of the burner, a wide combustion space must be secured in front of the burner, and the combustion equipment becomes large. In addition, the gas burner is a burner whose combustion amount adjustment range is relatively wide, but if it is necessary to change the combustion amount further significantly, multiple burners must be installed, and the combustion equipment becomes even larger. become.

[0005] Also, depending on the combustion conditions, or increased production of harmful substances such as NO _X, or unburned content discharge of hydrocarbons, soot or generated, become one of environmental pollution It is concerned.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tubular flame burner which can perform high load combustion, has a very large adjustment range of the amount of combustion, is small in size, and is less likely to cause environmental pollution.

[0007]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a tubular combustion chamber having one open end, and the other end of the combustion chamber has fuel gas and oxygen at the other end. A nozzle for injecting a premixed gas of the contained gas is provided in a direction tangential to the inner wall surface.

In the second invention, a tubular combustion chamber having one open end is provided, and a nozzle for blowing a fuel gas and a nozzle for blowing an oxygen-containing gas into the other end of the combustion chamber are tangential to an inner wall surface thereof. It is provided for.

In the third invention, a tubular combustion chamber having one open end and a plurality of gas mixers for mixing a fuel gas and an oxygen-containing gas or oxygen are provided. A nozzle connected to the gas mixer is provided in a tangential direction of an inner wall surface thereof, and a valve is provided in a fuel gas pipe and an oxygen-containing gas pipe connected to the gas mixer,
By opening and closing the selected valve, the gas ejected from each nozzle can be changed to any of fuel gas, oxygen-containing gas, or premixed gas.

According to a fourth aspect of the present invention, in the first aspect, a thermometer for measuring the inner wall temperature is provided at a downstream end of the combustion chamber, and the fuel gas and the oxygen are measured based on the detected value of the thermometer. A control mechanism is provided that is configured to adjust the flow rate of the premixed gas composed of the contained gas.

In a fifth aspect, in the second aspect or the third aspect, a thermometer for measuring an inner wall temperature is provided at a downstream end of the combustion chamber, and a thermometer is provided based on a detection value of the thermometer. And a control mechanism configured to regulate the flow rate of the fuel gas and / or the oxygen-containing gas.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, a spacer is provided at the other end of the combustion chamber so as to be movable in the tube axis direction.

In a seventh aspect, in any one of the first to sixth aspects, the downstream portion of the combustion chamber has a shape whose diameter is reduced toward the open end.

According to an eighth aspect, in any one of the first to seventh aspects, at least a part of the inner wall of the combustion chamber is formed of a refractory.

According to a ninth aspect, in any one of the first to seventh aspects, a cooling jacket is provided in at least a part of the combustion chamber.

According to a tenth aspect of the present invention, in any one of the first to seventh aspects, a cooling jacket is provided on a combustion exhaust gas outlet side of a position of the combustion chamber where the gas injection nozzle is arranged. This portion is formed in a double tubular shape, and a nozzle for supplying an oxygen-containing gas serving as a cooling fluid to the outer tube of the double tubular portion is provided. A slit-shaped opening is provided along the opening, and an oxygen-containing gas is blown into the combustion chamber from the opening.

In the above inventions, the term "oxygen-containing gas" refers to a gas for supplying oxygen for combustion, such as air, oxygen, oxygen-enriched air, or a mixed gas of oxygen and exhaust gas.

[0018]

1 and 2 are views showing a first example according to an embodiment of the present invention. FIG. 1 is a partially cutaway side view, and FIG. It is sectional drawing of the A arrow.
Numeral 10 denotes a tubular combustion chamber, one end of which is open and serves as a discharge port for combustion exhaust gas. At the other end, a long slit is formed along the pipe axis direction, and a nozzle 11 that is connected to the slit and blows a premixed gas composed of a fuel gas and an oxygen-containing gas is provided.

The nozzle 11 is provided in a direction tangential to the inner wall surface of the combustion chamber 10, and a swirling flow is formed in the combustion chamber 10 by blowing a premixed gas. Further, the nozzle 11 has a flattened tip portion and a reduced opening area, so that premixed gas is blown at a high speed. Reference numeral 12 denotes a spark plug.

In FIGS. 1 and 2, the nozzle 11
Although a plurality of nozzles 11 are shown, when premixed gas is burned, the number of nozzles 11 does not necessarily have to be plural, but may be only one.

In the burner having the above-described configuration, when the premixed gas blown from the nozzle 11 to form a swirling flow is ignited, the gas in the combustion chamber 10 is stratified by the density difference, and the density of the gas differs on both sides of the flame. A gas layer is formed. That is, high-temperature combustion exhaust gas is present on the axis side where the swirling speed is low, and unburned gas is present on the inner wall side of the combustion chamber where the swirling speed is high.

In addition, the flame cannot stay near the inner wall because the swirling speed is higher than the flame propagation speed near the inner wall. Therefore, the flame is generated in the combustion chamber 10 in a tubular shape. Numeral 40 indicates a tubular flame. Since unburned gas exists near the inner wall of the combustion chamber,
The wall surface of the combustion chamber 10 is not heated to a high temperature by direct heat transfer. Then, the gas in the combustion chamber 10 flows to the downstream side while swirling. During this time, the gas on the inner wall side sequentially burns, moves to the axial center side, and is discharged from the open end.

By the way, when a plurality of nozzles 11 are provided as in the embodiment shown in FIGS.
By connecting a fuel gas pipe or an oxygen-containing gas pipe to these nozzles, the nozzles can be divided into a fuel gas nozzle and an oxygen-containing gas nozzle, and the fuel gas and the oxygen-containing gas can be separately blown. In this way, even if the fuel gas and the oxygen-containing gas are separately blown, the respective gases remain in the combustion chamber 1
0 at a high speed toward the tangential direction of the combustion chamber 10
Since the mixture is efficiently mixed in the region near the inner wall, the flame shape is substantially the same as that in the case where the premixed gas is burned, except for a slight increase in the thickness of the flame zone.

The burner having the above configuration has the following advantages. Since it burns in the combustion chamber 10 and no flame exists outside the combustion chamber 10 (outside the burner),
It is not necessary to secure a space for combustion in front of the burner.

Further, since there is no flame outside the burner, even if a flow field is formed at the introduction destination of the combustion exhaust gas,
It does not affect the flame and there is no need to provide a flame stabilizer.

Although the premixed gas is blown at a high speed, the swirling speed is low in the central portion of the combustion chamber 10 and the flame is stabilized here, so that even when the blowing speed is high, it is stable. A premixed flame is formed, enabling high load combustion. Then, the following advantages are added by forming a stable premixed flame.

The variation in the temperature of the discharged flue gas is small, and the temperature of each part at the introduction destination of the flue gas is maintained in a state without variation.

[0028] Oxygen utilization efficiency can be improved, and there is no need to supply an extra oxygen-containing gas in connection with this, so that high-temperature combustion exhaust gas can be generated.
Further, since combustion can be performed even under a condition in which the fuel gas component is extremely lean, the stable combustion range of the burner itself can be widened and low-temperature combustion exhaust gas can be generated.

The small variation in the temperature of the combustion exhaust gas, since no local high-temperature portion occurs during combustion, the amount of harmful substances such as NO _X is small.

Since the mixing property between fuel and oxygen is good and a local low-temperature region cannot be formed, the residual amount of unburned components such as hydrocarbons is not very small, and soot is hardly generated.

When a plurality of nozzles 11 are provided and divided into a nozzle for fuel gas and a nozzle for oxygen-containing gas, the gas to be supplied can be preheated to a high temperature region above the ignition point. The flame temperature can be increased, and heat recovery by heat exchange with exhaust gas or the like can be effectively performed.

FIGS. 3 and 4 are views showing a second example according to the embodiment of the present invention. FIG. 3 is a partially cutaway side view, and FIG. 4 is a sectional view. 3 and 4, FIGS. 1 and 2
The same reference numerals are given to the parts described in, and the description is omitted.

In this embodiment, a plurality of nozzles 11a and 11b are provided, and these nozzles are connected to gas mixers 13a and 13b for mixing a fuel gas and an oxygen-containing gas, respectively. Fuel gas pipes and oxygen-containing gas pipes are connected to the gas mixers 13a and 13b, respectively, and these pipes are provided with valves.

In the burner having the above configuration, when all of the valves 14a to 15b provided in the respective pipes are opened, both of the nozzles 11a and 11b become nozzles for blowing a premixed gas. Further, when any of the valves provided in the pipe connected to the gas mixer is closed, the nozzle becomes a nozzle for fuel gas or a nozzle for oxygen-containing gas.

For example, when the valves 14b and 15a are closed, the nozzle 11a becomes a nozzle for fuel gas and the nozzle 11b becomes a nozzle for oxygen-containing gas. For this reason, even during operation, it is possible to switch according to the situation, such as injecting a premixed gas and injecting the mixture, or separately injecting the fuel gas and the oxygen-containing gas.

FIG. 5 is a diagram showing a third example according to the embodiment of the present invention. In FIG. 5, the parts described in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted. In this embodiment, a thermometer 16 for measuring the inner wall temperature at the downstream end of the combustion chamber 10 is provided, and a signal of a value detected by the thermometer 16 is calculated by an arithmetic and control unit 18.
To be sent to

Further, a flow controller 17 is provided in a pipe connected to the nozzle 11 for blowing the premixed gas, and a signal of a flow value detected by the flow controller 17 is sent to an arithmetic / controller 18. At the same time, a control signal is sent from the arithmetic and control unit 18 to the flow controller 17.

However, depending on the combustion conditions, the tubular flame tends to attenuate the swirling flow toward the downstream and collapse the shape of the flame, so that the inner wall temperature at the downstream end becomes high, or unburned gas is generated. Occurs in the burner configured as described above. In the burner configured as described above, the inner wall temperature at the downstream end is controlled to a predetermined temperature based on a control signal from the arithmetic / controller 18. The flow rate of the premixed gas is adjusted.

For this reason, at the downstream end of the combustion chamber 10, a tubular flame 40 is always formed, and the length of the flame is maintained so as not to go out of the combustion chamber 10, so that the downstream end is heated to a high temperature. Problems such as damage due to exposure and emission of unburned gas are prevented from occurring.

FIG. 6 is a diagram showing a fourth example according to the embodiment of the present invention. 6, the same reference numerals are given to the parts described in FIGS. 3 to 5 and the description is omitted. In this embodiment, a plurality of nozzles 11a, 11b
These nozzles are provided with gas mixers 13a, 13a for mixing the fuel gas and the oxygen-containing gas, respectively.
3b is connected. Also, the gas mixers 13a, 13b
Are connected to a fuel gas pipe and an oxygen-containing gas pipe, respectively, and these pipes are provided with valves, respectively.

Further, a thermometer 16 for measuring the inner wall temperature at the downstream end of the combustion chamber 10 is provided, and a signal of a value detected by the thermometer 16 is sent to the arithmetic and control unit 18. It has become. The fuel gas pipe and the oxygen-containing gas pipe have flow controllers 19 and 20 respectively.
A signal of the flow rate value detected by the flow controllers 19 and 20 is sent to the arithmetic and control unit 18, and a control signal is sent from the arithmetic and control unit 18 to the flow controllers 19 and 20. It is supposed to be.

Depending on the combustion conditions, the length of the flame changes due to the change in the mixing ratio of the fuel gas and the oxygen-containing gas, or the swirling flow is attenuated toward the downstream, the shape of the tubular flame collapses, and the downstream end is reduced. A phenomenon may occur in which the temperature of the inner wall of the part becomes high, or unburned gas is exhausted while remaining. However, in the burner configured as described above, the calculation / controller 18 performs the calculation based on the above three signals, and the fuel gas flow rate and the oxygen flow rate are controlled so that the inner wall temperature at the downstream end becomes a predetermined temperature. A signal for controlling the flow rate of both or any one of the contained gas flows is transmitted, and the flow rate is adjusted, so that the combustion state is properly maintained.

As described above, the adjustment of the mixing ratio of the fuel gas and the oxygen-containing gas or the adjustment of the blowing amount is performed, so that the flame becomes short and does not reach the downstream end.
The phenomenon that the flame becomes longer and forms outside the combustion chamber 10 or that the combustion by the normal tubular flame is not performed at the downstream end does not occur.

FIG. 7 is a view showing a fifth example according to the embodiment of the present invention, and is a side view with a part cut away. 7, the same reference numerals are given to the portions described in FIGS. 1 and 2 and the description is omitted. In this embodiment, a spacer 21 is inserted into the upstream end of the combustion chamber 10. The spacer 21 slides with the combustion chamber 10 and is movable in the tube axis direction. 22 is a driving device of the spacer. Therefore, if the spacer 21 is moved to the downstream side, the combustion section in the combustion chamber 10 is shortened.

According to the burner having such a configuration, even if the flame length becomes short when the amount of combustion is reduced, the position where the flame is formed is adjusted by appropriately moving the spacer 21 to the downstream side. The end of the flame may be formed at the downstream end. For this reason, the problem that the downstream end of the combustion chamber 10 is damaged by being exposed to high temperature is prevented.

Although FIG. 7 shows a case in which the nozzle 11 for blowing the premixed gas is provided, the present invention is not limited to the gas blowing method, and the nozzle for the premixed gas is provided. May be provided, or a nozzle for the fuel gas and a nozzle for the oxygen-containing gas may be separately provided.

FIG. 8 is a view showing a sixth example according to the embodiment of the present invention, and is a side view with a part cut away. In FIG. 8, the same reference numerals are given to the portions described in FIGS. In this embodiment, the downstream portion of the combustion chamber 10 is reduced in diameter toward the open end,
It has a tapered shape.

As described above, if the downstream portion of the combustion chamber 10 is made thinner, a decrease in the swirling speed at the downstream end portion does not occur even if the blowing amount is reduced. For this reason, a normal tubular flame is also formed at the downstream end, and the problem that the inner wall of the downstream end becomes abnormally high temperature and is damaged does not occur.

Although FIG. 8 shows the case where the nozzle 11 for blowing the premixed gas is provided, the present invention is not limited to the gas blowing method, and the nozzle for the premixed gas is provided. May be provided, or a nozzle for the fuel gas and a nozzle for the oxygen-containing gas may be separately provided.

FIG. 9 is a view showing a seventh example according to the embodiment of the present invention, and is a side view with a part cut away. In FIG. 9, portions described in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted. In this embodiment, the combustion chamber 10 has two parts, the upstream part 10a is formed of metal, and the downstream part 10b is formed of refractory. The two parts are connected by a flange joint. The combustion chamber 10 is flange-joined to an opening provided in a device to which the combustion chamber 10 is attached.
Numeral 30 denotes a steel shell of a device for attaching a burner, and 31 denotes a refractory lining the steel shell.

As described above, when at least the downstream portion of the combustion chamber 10 is formed of a refractory, the flame length is shortened or the swirling flow is attenuated due to a change in the mixing ratio of the fuel gas and the oxygen-containing gas. And the shape of the tubular flame collapsed,
Even if the downstream side of the combustion chamber 10 becomes hot, or is heated by radiant heat from a flame or hot gas on the axial side,
Damage to the combustion chamber 10 is avoided.

As means for preventing damage to the combustion chamber 10 due to fluctuations in the combustion state, at least a downstream portion of the combustion chamber 10 may be provided with a cooling structure in addition to the embodiment shown in FIG. When selecting a cooling method, an air cooling method is better than a water cooling method. In the case of the water cooling method, the inner wall may be excessively cooled and dew may be formed on the inner wall.

FIG. 9 shows a case where a nozzle 11 for blowing a premixed gas is provided. However, the present invention is not limited to a gas blowing method, and a nozzle for a premixed gas is provided. Is provided,
The fuel gas nozzle and the oxygen-containing gas nozzle may be separately provided.

FIGS. 10, 11 and 12 are views showing an eighth example according to the embodiment of the present invention. FIG. 10 is a partially cutaway side view, and FIG. BB
FIG. 12 is a cross-sectional view taken along arrow CC in FIG. 10. 10 to 12, the same reference numerals are given to the portions described in FIGS. 1 and 2 and the description is omitted. In this embodiment, a cooling jacket 23 is provided on the exhaust gas discharge port side of the combustion exhaust gas from the position where the gas injection nozzle 11 of the combustion chamber 10 is disposed, and this portion is formed in a double tubular shape. I have. A nozzle 25 for supplying an oxygen-containing gas serving as a cooling fluid is provided in the outer tube 24 of the double tube-shaped portion in a direction tangential to the inner wall surface. Further, a slit-shaped opening 26 is provided along the pipe axis direction in the combustion chamber 10 which is an inner tube of a double tubular portion, and oxygen-containing gas is blown into the combustion chamber 10 from the opening 26. It is supposed to be. The slit-shaped opening 26 provided in the combustion chamber 10 is provided in a direction tangential to the inner wall surface.

If the nozzle 25 for supplying the oxygen-containing gas is provided in the tangential direction of the inner wall surface, the flow rate of the oxygen-containing gas flowing on the outer periphery of the combustion chamber 10 increases, and the heat transfer from the combustion chamber 10 Is promoted and the jacket 23
The temperature difference inside becomes smaller. When the opening 26 is provided in the tangential direction of the inner wall surface of the combustion chamber 10, the combustion chamber 1
Since the oxygen-containing gas blown into the chamber 0 is mixed while swirling, the phenomenon in which the tubular flame formed by the swirling flow is not disturbed does not occur.

When the oxygen-containing gas is supplied as a cooling fluid to the cooling jacket 23 as described above, the combustion chamber 10
Is cooled, the abnormal temperature rise caused by the fluctuation of the combustion conditions as described above is prevented, and the heat radiated from the combustion chamber 10 is recovered by the oxygen-containing gas. And
Since the oxygen-containing gas is blown into the combustion chamber 10 as secondary air, the temperature of the combustion exhaust gas becomes high, and the generation of harmful gases such as CO is suppressed. For this reason, according to the above configuration, a tubular flame burner having functions of energy saving and low pollution can be obtained.

In the above embodiment, after the oxygen-containing gas supplied to the jacket 23 is heated,
Although the heated oxygen-containing gas is blown into the combustion chamber 10, the heated oxygen-containing gas may be supplied to the gas blowing nozzle 11 as primary air for burning the premixed gas.

Although the above-described embodiment shows an example in which the fuel gas is blown in a premixed gas with an oxygen-containing gas, the present invention is directed to a case where the injected fuel gas is a premixed gas. The fuel gas and the oxygen-containing gas are blown from separate nozzles.

[0059]

According to the present invention, since a stable flame is formed in a high-speed swirling flow, extremely high-load combustion can be performed. Further, since the range of adjustment of the combustion amount is wide, a single burner can cope with a wide range of combustion amount. Further, since a flame is formed in the burner, a space for combustion is not required in front of the burner, and the size of the combustion equipment can be reduced.

[0060] Also, small variations in the temperature of the combustion exhaust gas, on the local high-temperature region is not formed, since it is also possible to reduce the oxygen supply ratio, is extremely small generation of harmful gases such as NO _X, soot generation As a result, there is almost no exhaust gas without being burned, and low pollution of exhaust gas is achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first example according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a diagram showing a second example according to the embodiment of the present invention.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

FIG. 5 is a diagram showing a third example according to the embodiment of the present invention.

FIG. 6 is a diagram showing a fourth example according to the embodiment of the present invention.

FIG. 7 is a diagram showing a fifth example according to the embodiment of the present invention.

FIG. 8 is a diagram showing a sixth example according to the embodiment of the present invention.

FIG. 9 is a diagram showing a seventh example according to the embodiment of the present invention.

FIG. 10 is a diagram showing an eighth example according to the embodiment of the present invention.

11 is a cross-sectional view taken along the line BB in FIG.

FIG. 12 is a sectional view taken along the line CC in FIG. 10;

[Explanation of symbols]

 Reference Signs List 10 Combustion chamber 10a Upstream part of combustion chamber 10b Downstream part of combustion chamber 11, 11a, 11b Nozzle for blowing gas 12 Spark plug 13a, 13b Gas mixer 14a, 14b Valve 15a, 15b Valve 16 Thermometer 17 Flow rate Controller 18 Calculation / Controller 19 Flow controller 20 Flow controller 21 Spacer 22 Spacer driving device 23 Cooling jacket 24 Outer pipe of cooling jacket 25 Nozzle for supplying oxygen-containing gas to cooling jacket 26 Combustion chamber inside cooling jacket Opening provided in 30 30 Steel shell of device to attach burner 31 Refractory lined in steel shell 40 Tubular flame

Claims (10)

[Claims] A tubular combustion chamber having an open end;
A tubular flame burner, characterized in that a nozzle for blowing a premixed gas comprising a fuel gas and an oxygen-containing gas is provided at the other end of the combustion chamber in a direction tangential to an inner wall surface thereof. 2. It has a tubular combustion chamber open at one end,
A tubular flame burner, characterized in that a nozzle for blowing a fuel gas and a nozzle for blowing an oxygen-containing gas are provided in the other end of the combustion chamber in a direction tangential to the inner wall surface. 3. A combustion chamber having an open end and a plurality of gas mixers for mixing a fuel gas and an oxygen-containing gas or oxygen, wherein each of the gas mixers is provided at the other end of the combustion chamber. A nozzle connected to is provided in a tangential direction of its inner wall surface, a valve is provided in a fuel gas pipe and an oxygen-containing gas pipe connected to the gas mixer, and by opening and closing the selected valve, A tubular flame burner characterized in that the gas ejected from each nozzle can be changed to one of a fuel gas, an oxygen-containing gas, and a premixed gas. 4. A thermometer for measuring the temperature of the inner wall at the downstream end of the combustion chamber is provided, and the flow rate of a premixed gas comprising a fuel gas and an oxygen-containing gas is adjusted based on a detection value of the thermometer. The tubular flame burner according to claim 1, further comprising a control mechanism configured to perform the control. 5. A thermometer for measuring a temperature of an inner wall at a downstream end of the combustion chamber, wherein a flow rate of the fuel gas and / or the oxygen-containing gas is adjusted based on a detected value of the thermometer. The tubular flame burner according to claim 2 or 3, further comprising a control mechanism configured as follows. 6. The tubular flame burner according to claim 1, wherein a spacer movable in an axial direction of the combustion chamber is provided at the other end of the combustion chamber. 7. The tubular flame burner according to claim 1, wherein a downstream portion of the combustion chamber has a shape whose diameter is reduced toward an open end. 8. The tubular flame burner according to claim 1, wherein at least a part of an inner wall of the combustion chamber is formed of a refractory. 9. The tubular flame burner according to claim 1, wherein a cooling jacket is provided in at least a part of the combustion chamber. 10. A cooling jacket is provided on the combustion exhaust gas outlet side of the combustion chamber from a position where the gas injection nozzle is disposed, and this portion is formed in a double tubular shape. A nozzle for supplying an oxygen-containing gas serving as a cooling fluid is provided to the outer tube of the section provided, and a slit-shaped opening is provided in the combustion chamber along the pipe axis direction. The tubular flame burner according to any one of claims 1 to 7, wherein gas is blown.