JP2017219221A - Hydrogen combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep a segment for performing a control operation for combustion apart from a burner and at the same time to assure safety when hydrogen is ignited.SOLUTION: This invention relates to a hydrogen combustion device 11 provided with a burner 15 for igniting hydrogen at a terminal end of a supply passage 14 for supplying hydrogen gas. A control operation part 13 having a control member for controlling a flow of supplied gas is installed at an upstream side location of the supply passage 14 and a flame diminishing element 26 is installed at a terminal end of the control operation part 13. Then, there is provided a separation part 14d for separating the burner 15 from the control operation part 13 with a distance between a flame port 15a of the burner 15 and the flame diminishing element 26 being applied as a length of less than a DDT distance that is a distance for transfer from a deflagration to detonation between the control operation part 13 and the burner 15 in the supply passage 14. Hydrogen is supplied to the burner 15 at 100 vol% and a speed more than a hydrogen combustion speed to perform a diffusion combustion.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hydrogen combustion apparatus that burns hydrogen, and more particularly to a hydrogen combustion apparatus that can safely supply hydrogen.

  While hydrogen has the advantage of not generating carbon dioxide when burned, it is classified as IIC in the explosion gas group in the explosion-proof standard and is highly explosive. Therefore, it is important to ensure safety. Since hydrogen has a high combustion speed and is easy to backfire, a backfire prevention device is indispensable in a hydrogen combustion apparatus such as an engine using hydrogen gas as a fuel disclosed in Patent Document 1 below.

  The backfire prevention device allows the gas to pass but prevents the passage of the flame, and is attached at a position close to the fire source. However, depending on the type and application of the hydrogen combustion apparatus, there is a case where it is desired to separate the part for performing the control operation from the fire source for reasons such as structure and production. In such a case, since the backfire prevention device is larger and heavier than the supply pipe for supplying hydrogen, if it is provided near the fire source independently from the part that performs the control operation, the part that performs the control operation is fired. The meaning away from the original is lost.

JP 2012-149559 A

  Accordingly, the main object of the present invention is to keep the fire source away from the part where the control operation is performed and to ensure safety.

  The means for this is a hydrogen combustion apparatus provided with a burner that burns the hydrogen at the end of the supply path for supplying hydrogen, and for controlling the flow of the gas supplied to the upstream side portion of the supply path A control operation unit having a member, a flame extinguishing element is disposed on a terminal side of the control operation unit, and a flame opening of the burner and the flame extinguishing element between the control operation unit and the burner in the supply path. A distance part between the control operation part and a distance less than the DDT distance, the burner diffusively burns the hydrogen supplied at 100 vol%, and the hydrogen is hydrogen This is a hydrogen combustion apparatus that is supplied at a speed equal to or higher than the combustion speed.

  The “DDT” means “Deflagation to Detonation Transition”, which refers to the transition from deflagration to detonation, and “DDT distance” refers to the transition from the source of the fire, that is, the burner crater to the detonation. The distance.

  In addition to “deflagration” and “detonation”, “deflagration” (defragmentation) propagates while transferring the heat generated by the burned gas to the unburned gas by heat conduction. ) Is accelerated by the expansion of the combustion gas, compresses the unburned gas ahead and further accelerates, but the propagation speed of the flame is slower than the speed of sound. On the other hand, “detonation” (detonation) increases the temperature of the unburned gas by a shock wave and propagates while raising the temperature of the unburned gas above the self-ignition temperature by the shock wave. The propagation speed exceeds the speed of sound.

  Moreover, the burning rate of hydrogen is about 90 m / s (when the mixing ratio of hydrogen and oxygen is 70:30 under atmospheric pressure).

  In this configuration, the hydrogen supplied to the burner through the supply path is 100 vol% and the supply speed is faster than the combustion speed. Also, backfire is less likely to occur. The flame extinguishing element provided in the control operation part on the upstream side of the supply path protects the upstream part of the flame extinguishing element at the stage before detonation even in the event of a backfire, Removes the burner from the control operation unit as necessary within the range of the length less than the DDT distance.

  According to the present invention, the burner can be separated from the control operation unit, and safety can be ensured in hydrogen combustion.

The schematic block diagram of a hydrogen combustion apparatus. The schematic block diagram of the production | presentation apparatus using a hydrogen combustion apparatus. The schematic block diagram of a test apparatus.

  In FIG. 1, the schematic block diagram of the hydrogen combustion apparatus 11 is shown. This hydrogen combustion apparatus 11 is used in a production apparatus 11a as shown in FIG. 2, for example, to light a torch, a bonfire, a bonfire, etc. used in various events and ceremonies, store sales, shrines and temples, gardens, etc. In addition, it is used in various devices such as a cooking device (not shown) to emit a flame.

  The production device 11a shown in FIG. 2 will be briefly described. The production device 11a includes a flame discharge unit 12 that displays a flame, and a control operation unit 13 that controls supply and flow of hydrogen. The flame discharge unit 12 includes: It is installed at a position away from the control operation unit 13 by a predetermined distance.

  First, the hydrogen combustion device 11 will be described, and then the rendering device 11a will be described.

  As shown in FIG. 1, the hydrogen combustion apparatus 11 includes a burner 15 that generates hydrogen flame F by burning hydrogen at the end of a supply path 14 for supplying hydrogen. A control operation unit 13 having a control member for controlling the flow of the supplied gas is provided.

  The supply path 14 includes a main line 14a for supplying hydrogen and a purge line 14b for supplying nitrogen. The end of the purge line 14b is connected to the middle of the main line 14a. As the pipe constituting the supply path 14, a pipe having an appropriate diameter is used according to the application.

  The burner 15 diffuses and burns hydrogen supplied at a concentration of 100 vol%, is formed in a cylindrical shape, and has a circular flame port 15a. Although the case where there is one burner 15 is illustrated in the example of FIG. 1, a plurality of burners 15 may be provided. In FIG. 1, 16 is a pilot burner.

  The control operation unit 13 includes an upstream portion of the main line 14a and a purge line 14b, and includes a cylinder, various valves such as a pressure reducing valve, a flow meter, a flame extinguishing element, and the like. Specifically, the main line 14a has a hydrogen cylinder 17 for storing hydrogen, a pressure reducing valve 18 for dynamically controlling the flow rate, and an internal pressure that rises abnormally as the aforementioned control members in order from the upstream side. It has a safety valve 19 that automatically releases pressure, a flow meter 21, a pressure gauge 22, a pressure reducing valve 23, a pressure gauge 24, a ball valve 25 that adjusts and opens and closes the flow, a flame extinguishing element 26, and a pressure gauge 27.

  The flame extinguishing element 26 has a known configuration in which holes (not shown) smaller than the extinguishing diameter are assembled, and has a function of subdividing a flame while allowing hydrogen to pass through but subdividing the flame. The flame extinguishing element 26 is provided in a housing 28 having a connection part connected to the tube, and the flame extinguishing element 26 is arranged on the terminal side in the control operation unit 13 as described above. The flame extinguishing element 26 preferably has a small pressure loss so as not to hinder the flow of hydrogen in the main line 14a. By suppressing the pressure loss, hydrogen can be stably supplied at a flow rate equal to or higher than the combustion rate, and the risk of the hydrogen flow rate becoming lower than the combustion rate can be reduced as much as possible. As the flame extinguishing element 26, for example, end-of-line defragmentation made of commercially available crimp metal can be used.

  A purge line 14b is connected between the safety valve 19 and the flow meter 21 in the main line 14a. The purge line 14b includes a nitrogen cylinder 31, a pressure reducing valve 32, a check valve 33, and a manual valve 34 as the aforementioned control members in order from the upstream side. The purge line 14b is used to replace hydrogen contained in a portion of the main line 14a ahead of the purge Iran connection 14c with inert nitrogen gas at the start of combustion or at the end of combustion.

  The pressure reducing valves 18, 23, 32, the flowmeter 21, and the pressure gauges 22, 24, 27 in the main line 14a and the purge Iran 14b are connected to a control unit (not shown) and are driven and controlled. The control unit performs control to supply the hydrogen supplied from the hydrogen cylinder 17 at a speed equal to or higher than the hydrogen combustion speed. Since the burning rate of hydrogen is about 90 m / s, hydrogen is supplied at a higher rate, for example, about 165 m / s.

  A portion of the main line 14 a between the control operation unit 13 and the burner 15 is a separation unit 14 d that separates the burner 15 from the control operation unit 13. The spacing portion 14d is mainly composed only of a tubular body, and the distance L between the flame opening 15a of the burner 15 and the flame extinguishing element 26 is a length less than the DDT distance, and is a length less than the DDT distance. The length is set as required within the range. That is, even when a backfire occurs in the burner 15, the flame extinguishing element 26 is configured to act at a stage before the transition from deflagration to detonation.

  As a specific example, when the supply path 14 is formed of a pipe body having a nominal diameter of 50A in the JIS standard, the length of the separation portion 14d is 100 to 300 times the nominal diameter of the pipe body, that is, 5 m to You can select from a range of 15m.

  The flame discharge unit 12 of the rendering device 11a using the hydrogen combustion device 11 having such a configuration includes a burner 15 surrounded by an exterior body 41 and a coloring unit 42 as a coloring unit in a direction in which the flame of the burner 15 is emitted. Configure. The colored portion 42 is for visualizing the transparent hydrogen flame F.

  The exterior body 41 has an opening 41a in the direction in which the flame is emitted, in the illustrated example, and has an accommodation space 41b inside. The shape of the exterior body 41 is appropriately set according to the purpose of use. The exterior body 41 in the illustrated example has a circular cylindrical shape in plan view in which the opening 41a at the upper end has the largest diameter.

  A plurality of burners 15 are arranged with the flame port 15a that emits the hydrogen flame F facing upward. The arrangement shape of these burners 15 forms a circular surface in plan view as a whole with a space between them. The size of the circular surface formed by the plurality of burners 15 is a size that fits in the upper part of the accommodation space 41 b of the exterior body 41.

  All the burners 15 are supported by the support base 43 with the same height of the flame opening 15 a and are held in the accommodation space 41 b of the exterior body 41.

  The coloring portion 42 is provided at the tip of the direction in which the hydrogen flame F is emitted from the flame port 15a of the burner 15, that is, above. The coloring part 42 includes a coloring member 45 and a through part 46 through which the hydrogen flame F passes. The coloring member 46 is a member in which a coloring material (not shown) exhibiting a flame reaction is supported on a porous body (not shown). The porous body supporting the colorant can be used as appropriate as long as it has heat resistance, but in the existing one, for example, lava is used. Among the lava, the Sakurajima lava (Osumi fall pumice) produced in Kagoshima Prefecture is white and very porous, and has the property of not cracking even when there is a temperature change, so it can be suitably used.

  For the color former, an appropriate metal salt is used according to the color to be colored. For example, sodium chloride is used for coloring yellow, copper (I) chloride is used for coloring green, and strontium chloride is used for coloring red. A coloring material such as these is dissolved in water to form an aqueous solution, which is impregnated into a porous body and dried. Impregnation and drying are repeated a plurality of times, and a large number of colorants are supported on the porous body.

  The coloring portion 42 illustrated in FIG. 2 is an example in which a plurality of coloring members 45 are provided, and the through portion 46 through which the hydrogen flame F passes is configured with a space that can be interposed between the coloring members 45 when the plurality of coloring members 45 are arranged. is there. The plurality of coloring members 45 are in the shape of different shapes. Preferably, the color forming member 45 may have various shapes so as to form a variety of gaps when arranged.

  The size of the coloring member 45 is set as appropriate, but may be set in consideration of the size of the flame opening 15a of the burner 15 and the arrangement interval of the burners 15. That is, for example, if the size of the coloring member 45 is too large compared to the diameter of the flame port 15a of the burner 15, that is, the size of the cross section of the hydrogen flame F, it is difficult to obtain the hydrogen flame F that passes through the through-hole 46, Even if it is obtained, the flame shape becomes sharp. On the contrary, if the size of the coloring member 45 is too small compared to the diameter of the flame port 15a of the burner 15, the required number of the coloring member 45 increases and the handling becomes complicated, and the penetrating portion 46 becomes smaller. The hydrogen flame F passing through the penetrating portion 46 becomes thin. Therefore, as in the example shown in FIG. 2, a plurality of coloring members 45 are provided, and the through portion 46 through which the hydrogen flame F passes is formed in a space formed between the coloring members 45 when the plurality of coloring members 45 are arranged. For this reason, it is preferable that the size of the coloring member 45 in a plan view is from the extent corresponding to the diameter of the flame opening 15a of the burner 15 to several times larger than that.

  Such coloring members 45 are appropriately arranged on the metal net 47 so that the through-holes 46 are formed between them, and all the coloring members 45 are exposed to the hydrogen flame F by the plurality of burners 15. Composed. The metal net 47 has a flat plate shape and is held horizontally in a holding cylinder 48 supported above the burner 15, in other words, parallel to the surface formed by the flame port 15 a of the burner 15.

  The holding cylinder 45 has a short cylindrical shape with openings at both upper and lower ends, and is held in the accommodation space 41 b of the exterior body 41. A mounting step portion 45a is formed on the inner peripheral surface of the holding cylinder 45, and the metal net 47 is held with its outer peripheral portion placed on the mounting step portion 45a.

  Such a colored portion 42 is installed at a predetermined distance from the flame outlet 15a of the burner 15. The predetermined distance is a distance in which the temperature of the hydrogen flame F touching the colored portion 42 is approximately in a specific range. That is, the temperature of the hydrogen flame F is set to be higher than the melting point of the coloring material in the coloring member 45 and lower than the boiling point. The temperature of the hydrogen flame F can be adjusted not only by the distance between the metal net 47 and the flame opening 15a of the burner 15, but also by the degree of air entrainment, the shape of the burner 15, and the flow rate of hydrogen.

  Among the coloring materials, for example, sodium chloride has a melting point of 800 ° C., a boiling point of 1413 ° C., and copper (I) chloride has a melting point of 430 ° C. and a boiling point of 1490 ° C. The temperature should be about 950 ° C. to 1000 ° C., at most about 1250 ° C. This is because the flame temperature varies. Even if the temperature of the hydrogen flame F in contact with the colored portion 42 is high, it is preferably lower by 50 degrees or more than the boiling point of the coloring material.

  The control operation unit 13 connected to the flame emitting unit 12 via the separation unit 14d is not visible from the outside as necessary, for example, in the basement, separately from the position where the flame emitting unit 12 is installed. It is installed as appropriate.

  The rendering device 11a configured as described above is used as follows.

  First, the metal net 47 is set on the holding cylinder 48 of the rendering device 11a, and the coloring member 45 is arranged on the metal net 47 to form the through portion 46. Although there are a plurality of the coloring members 45, the through portion 46 can be formed simply by arranging them, so that the colored portion 42 can be easily formed. Moreover, since the coloring member 45 is made of a porous body made of lava and all the coloring members 45 have different shapes, the through portions 46 having various shapes can be obtained simply by arranging them appropriately.

  After preparing in this way, the control operation unit 13 is operated to supply hydrogen to the burner 15 for combustion. The flame emitting unit 12 having the burner 15 and the control operation unit 13 are separated from each other by a separation unit 14d, so that the control operation unit 13 including the part having the flame extinguishing element 26 may interfere with the production effect, It can be avoided that a structure for supporting the portion having the element 26 is required. By setting conditions such as the diameter of the supply path 14 so that the DDT distance becomes longer, it is possible to increase the distance for separating the burner 15.

  When supplying hydrogen, hydrogen is supplied at a constant rate higher than the combustion rate of hydrogen. When hydrogen is combusted, a hydrogen flame F having a sharp flame shape is generated as shown by the phantom line in FIG. This hydrogen flame F is transparent and cannot recognize the color.

  However, in the hydrogen flame F, the colored portion 42 is located at a position where the temperature is higher than the melting point of the coloring material and lower than the boiling point, and the entire colored portion 42 is exposed to the hydrogen flame F, and the colored portion 42 is exposed. Are heated, and the hydrogen flame F passes through the through-holes 46 between the coloring members 45 and rises.

  When the color forming member 45 is heated, the supported color forming material is heated, and a part thereof is vaporized and excited to show a flame reaction on the hydrogen flame F and emit light of a predetermined color. This light colors the entire flame Fa rising through the through-holes 46 between the coloring members 45. That is, the transparent hydrogen flame F emitted from the plurality of burners 15 arranged at intervals is in contact with the entire coloring portion 42 and becomes a large flame Fa that is colored as a whole.

  Since the porous body carrying the coloring material is white lava, even when the flame Fa is viewed from an angle at which the coloring member 45 can be seen, the color of the flame Fa can be seen well.

  In addition, it is a porous body that supports the coloring material, and more coloring material can be impregnated and held, so that a coloring action can be obtained over a long period of time. In addition, the entire hydrogen flame F being in contact with the whole of the plurality of coloring members 45 means that the carried coloring material is used effectively without waste, and this also allows the coloring action to be continued for a long time.

  The temperature of the portion in contact with the colored portion 42 in the hydrogen flame F is a specific temperature not lower than the melting point of the colorant and lower than the boiling point. Therefore, although the colorant is melted by the heat of the hydrogen flame F, the amount of the colorant scattered by the vaporization is reduced. Can be suppressed. Also from this point, the coloring action can be sustained longer than in the case where the coloring material evaporates.

  In this way, the life of the coloring action can be extended from the structural aspect as well as the temperature aspect.

  The colored flame Fa is obtained in the process in which the hydrogen flame F is partially blocked from rising by the coloring member 45, is transmitted to lick the surface of the coloring member 45, and rises upward through the penetrating portion 46. The flame Fa has a slow speed and becomes a large and flickering flame Fa as a whole.

  The flame Fa obtained by coloring the hydrogen flame F as described above is a large flame Fa with high brightness and the entire color, and thus can be suitably used for production. Since the color of the flame Fa can be changed by changing the coloring material to be carried, this point is also suitable for production. In addition, since the fuel is hydrogen, it does not generate carbon monoxide or carbon dioxide gas even if it is burned, and this is safe and good for the environment.

  In order to confirm the safety of the hydrogen combustion apparatus 11, a flashback was generated by the test apparatus 51 as shown in FIG. In order to make a test under adverse conditions, a combustible gas in which air and hydrogen were mixed so that the volume ratio of hydrogen and oxygen in the mixed gas was 2: 1 was used. In addition, the pipes were leveled for horizontal propagation. This is because it is known that the flame extinguishing ability becomes harder to stop as the flame speed is faster, and the flame speed is affected by the flame propagation direction, and it is known that the lower propagation, the horizontal propagation, and the upward propagation become faster in this order, This is because horizontal propagation is a severer condition than downward propagation when assuming an environment in which downward propagation can occur.

  The test apparatus 51 uses a stainless steel pipe having a JIS standard nominal diameter of 50A and a total length of 13500 mm, and is a commercially available flame arrester that has a built-in flame extinguishing element at a position 12500 mm from the ignition-side terminal portion 52 that is one end in the longitudinal direction. 53 was incorporated. Among the pipes, the ignition side of the flame arrestor 53 is referred to as “ignition side”, and the reverse direction is referred to as “protection side”. For the flame arrester 53, a flame arrester for hydrogen / air mixed gas (for end-of-line defragmentation) “FRA-50-C series” manufactured by Kaneko Sangyo Co., Ltd. was used.

  A closing flange 54 that is removed at the time of ignition is provided at the end on the ignition side end portion 52 side, and an ignition port 55 is provided at a position inside thereof. Three sets of phototransistors 61, 62, 63, 64, 65, 66 are provided from the ignition port 55 to the frame arrester 53. The phototransistors 61, 62, 63, 64, 65, 66 are for detecting a flame in the pipe.

  The arrangement of these phototransistors 61, 62, 63, 64, 65, 66 is as follows. A first phototransistor 61 is provided at a position of 200 mm on the frame arrester 53 side from a position 500 mm from the ignition side end portion, and a second phototransistor 62 is provided at a position of 150 mm on the adjacent frame arrester 53 side. A third phototransistor 63 is provided at a position of 200 mm from the 4500 mm position to the frame arrester 53 side, and a fourth phototransistor 64 is provided at a position of 150 mm on the adjacent frame arrester 53 side. Further, a fifth phototransistor 65 is provided at a position 350 mm closer to the ignition side than an end on the ignition side of the frame arrester 53, and a sixth phototransistor 66 is provided at a position 150 mm closer to the frame arrester 53.

  Furthermore, a phototransistor (seventh phototransistor 67) was also provided at a position 200 mm from the frame arrester 53 on the protection side.

  On the protective side of the seventh phototransistor 67, a mixed gas introduction pipe 56 for supplying a premixed gas and a vacuum pump pipe 57 for evacuating are provided in this order.

  In addition, since the closing flange 54 is opened immediately before ignition, the entire ignition-side terminal portion 52 is covered with a silencer 58 for the purpose of suppressing the explosion sound generated.

  The test method is as follows.

  First, the inside of the piping was reduced from the vacuum pump piping 57 to a vacuum (−0.1 MPaG) using a vacuum pump, and the vacuum was continued for 10 minutes.

Next, a test gas is gently poured into the pipe from the mixed gas introduction pipe 56 from a tank that has been previously filled and allowed to stand until the hydrogen / air mixed gas (H ₂ 29.5%) is sufficiently mixed by the partial pressure method until it is sufficiently mixed. It filled until the pressure in piping became a positive pressure.

  After confirming that the pipe is filled with the test gas, the closing flange 54 is removed, the ignition side terminal 52 side is opened, an ignition device (not shown) is operated, and the mixed gas is supplied to the ignition port 55. Ignite. At this time, the flame speed is measured by the phototransistors 61, 62, 63, 64, 65, 66, and 67 to determine whether the flame propagation is a deflagration phenomenon or a detonation phenomenon. Further, the presence or absence of flame escape was confirmed by the seventh phototransistor 67 on the frame arrester 53 protection side.

  The number of measurements was 6 times according to the deflagration test regulations described in EN / ISO 16852, and the prevention of flame was confirmed.

  The flame speed is measured and flame prevention is confirmed by taking the signals from the phototransistors 61, 62, 63, 64, 65, 66, and 67 into a oscilloscope (not shown) and measuring the time that the flame has passed. Calculated. Further, when no signal was confirmed in the seventh phototransistor 67 attached to the protection side from the frame arrester 53, it was determined that the flame was prevented.

  As a result, the results shown in Table 1 below were obtained. In Table 1, “between first and second” means between the first phototransistor 61 and the second phototransistor 62. Similarly, “between third and fourth” and “between fifth and sixth” It means between the third phototransistor 63 and the fourth phototransistor 64 and between the fifth phototransistor 65 and the sixth phototransistor 66.

表１に示したように６回とも、第１フォトトランジスタ６１−第２フォトトランジスタ６２間、第３フォトトランジスタ６３−第４フォトトランジスタ６４間、第５フォトトランジスタ６５−第６フォトトランジスタ６６間と、順に火炎伝播速度が上がるものの、音速には到底至らない爆燃であることが判る。つまり６回とも爆轟は確認されなかった。

As shown in Table 1, all six times, between the first phototransistor 61 and the second phototransistor 62, between the third phototransistor 63 and the fourth phototransistor 64, and between the fifth phototransistor 65 and the sixth phototransistor 66. Although the flame propagation speed increases in order, it can be seen that the deflagration does not reach the speed of sound. In other words, no detonation was confirmed in all six times.

  Further, no flame was detected on the protective side in all six times. It was confirmed that the flame was extinguished without any flame runaway.

  Further, the flame extinguishing element of the frame arrester 53 after the measurement was visually confirmed, but no trace of damage or the like was observed.

  From the above, it was confirmed that there was no problem in the flame extinguishing performance by the flame arrestor 53 under open end ignition and horizontal flame propagation conditions.

  The above-described configuration is one configuration for carrying out the present invention, and other configurations can be adopted.

  For example, the flame extinguishing element 26 may be a device other than those described above, such as a device for detonation.

DESCRIPTION OF SYMBOLS 11 ... Hydrogen combustion apparatus 11a ... Production apparatus 13 ... Control operation part 14 ... Supply path 14d ... Separation part 15 ... Burner 15a ... Flame outlet 26 ... Flame extinguishing element 42 ... Coloring part F ... Hydrogen flame

Claims (3)

A hydrogen combustion apparatus comprising a burner for burning hydrogen at an end of a supply path for supplying hydrogen;
A control operation unit having a control member for flow control of the gas to be supplied is provided in the upstream side portion of the supply path,
A flame extinguishing element is disposed on the terminal side in the control operation unit,
A separation portion that separates the burner from the control operation portion between the control operation portion and the burner in the supply path, with a distance between the flame opening of the burner and the flame extinguishing element being a length less than a DDT distance. Prepared,
A hydrogen combustion apparatus in which the burner diffuses and burns the hydrogen supplied at 100 vol%, and the hydrogen is supplied at a rate equal to or higher than the hydrogen combustion rate. 2. The hydrogen combustion apparatus according to claim 1, wherein the supply path is configured by a pipe body having a nominal diameter of 50 </ b> A, and the length of the separation portion is 100 to 300 times the nominal diameter of the pipe body. The hydrogen combustion apparatus according to claim 1, wherein the flame extinguishing element is a flame extinguishing element for end-of-line defragmentation.

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