Combustion device

Abstract

To provide a combustion device capable of preventing its burning during combustion.SOLUTION: A combustion device (1) according to one embodiment of the present invention comprises: a first hydrogen feed pipe (4) protruding outward relative to an air cone (2) from a flame holding plate (7) covering the opening of the air cone (2); first burners (B1) ejecting hydrogen in the direction vertically crossing the center axis of the first hydrogen feed pipe (4) to generate a low-air-ratio combustion flame having high hydrogen concentration; second hydrogen feed pipes (5) disposed to surround the first hydrogen feed pipe (4) to protrude outward relative to the air cone (2) from the flame holding plate (7) when viewed from the extending direction of the center axis of the first hydrogen feed pipe (4); and second burners (B2) ejecting hydrogen in the direction of protrusion from the flame holding plate (7) on the second hydrogen feed pipes (5) to generate a high-air-ratio combustion flame having low hydrogen concentration.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a combustion device, for example, a combustion device that combusts a mixture of hydrogen and air. [Background technology]

[0002] For example, Patent Document 1 discloses a low NOx combustion apparatus including: first nozzles arranged in a plurality of locations on a portion protruding outward from an opening of an air cone of a gas header, for injecting fuel gas and generating a low air ratio combustion flame with a high gas concentration in a direction intersecting the central axis of the combustion apparatus; and second nozzles arranged in a plurality of locations on the outside of the gas header, forward of the first nozzles, for injecting a mixture of fuel gas and air and generating a high air ratio combustion flame with a low gas concentration in a direction substantially parallel to the central axis of the combustion apparatus. X A combustion device is disclosed.

[0003] At this time, in the second nozzle, a substantially V-shaped partition plate is inserted into the notch of the flame stabilizing plate covering the opening of the air cone, and the tip of the fuel gas injection nozzle is inserted into the partition plate. Then, the air guided into the partition plate and the fuel gas injected from the fuel gas injection nozzle are mixed to generate a high-air-ratio combustion flame. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4963621 Summary of the Invention [Problem to be solved by the invention]

[0005] The present applicant has found the following problem. When hydrogen is used as the combustion gas, hydrogen has a high combustion speed. Therefore, the combustion device of Patent Document 1 has a problem that the high air ratio combustion flame occurs around the second burner on the inner side of the air cone relative to the flame stabilizing plate, and the periphery of the second burner and the flame stabilizing plate become red-hot and burn out due to the high air ratio combustion flame.

[0006] The present disclosure has been made in consideration of such problems, and provides a combustion device capable of suppressing red heat during combustion. [Means for solving the problem]

[0007] A combustion device according to one aspect of the present disclosure is a combustion device that combusts a mixture of hydrogen and air, A flame retaining plate covering the opening of the air cone; a first hydrogen supply pipe passing through the inside of the air cone and protruding from the flame plate outward relative to the air cone; a first nozzle disposed in a portion of the first hydrogen supply pipe protruding from the flame stabilizing plate, the first nozzle blowing out hydrogen in a direction perpendicular to a central axis of the first hydrogen supply pipe to generate a low-air-ratio combustion flame having a high concentration of hydrogen; a second hydrogen supply pipe that is disposed so as to surround the first hydrogen supply pipe when viewed from the direction in which the central axis of the first hydrogen supply pipe extends, passes through the inside of the air cone, and protrudes outward from the flame stabilizing plate relative to the air cone; a second nozzle that is disposed in a portion of the second hydrogen supply pipe that protrudes from the flame stabilizing plate, is parallel to a central axis of the first hydrogen supply pipe, and blows out hydrogen in a direction protruding from the flame stabilizing plate of the second hydrogen supply pipe to generate a high air ratio combustion flame having a low concentration of hydrogen; Equipped with.

[0008] In the above-mentioned combustion device, the second burners are arranged at intervals in a circumferential direction around the central axis of the first hydrogen supply pipe, and The first nozzle is preferably disposed between adjacent second nozzles in a circumferential direction about a central axis of the first hydrogen supply pipe.

[0009] The above-mentioned combustion device includes a combustion chamber that is disposed on a side of the first hydrogen supply pipe in a direction protruding from the flame stabilizing plate relative to the flame stabilizing plate, and that expands in diameter toward the side of the first hydrogen supply pipe in a direction protruding from the flame stabilizing plate, The first burner and the second burner are disposed inside the combustion chamber, The first nozzle is preferably disposed on a side of the first hydrogen supply pipe in a direction protruding from the flame stabilizer relative to the second nozzle.

[0010] In the above-mentioned combustion device, it is preferable that the total amount of hydrogen blown out from all of the first hydrogen supply pipes is four times the total amount of hydrogen blown out from all of the second hydrogen supply pipes.

[0011] In the above-mentioned combustion apparatus, the flow rate of the hydrogen blown out from the second hydrogen supply pipe is preferably 165 Nm / s or more. Effect of the Invention

[0012] According to the present disclosure, it is possible to realize a combustion device capable of suppressing burn damage during combustion. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a view of the combustion device according to the embodiment as viewed from the +X-axis side. [Diagram 2] FIG. 2 is a diagram for explaining the arrangement of a first hydrogen supply pipe and a second hydrogen supply pipe in the combustion device of the embodiment. [Diagram 3] FIG. 2 is a diagram for explaining the state of combustion in the combustion device of the embodiment. [Figure 4] This figure shows the results of an investigation into the ratio between the total amount of hydrogen blown out from the hydrogen outlet of the first hydrogen supply pipe and the total amount of hydrogen blown out from the hydrogen outlets of all the second hydrogen supply pipes, as well as the flow rate of hydrogen blown out from the hydrogen outlets of the second hydrogen supply pipes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, in order to clarify the description, the following description and drawings are appropriately simplified. Here, in the following description, in order to clarify the description, a three-dimensional (XYZ) coordinate system is used.

[0015] First, the configuration of the combustion device of this embodiment will be described. Fig. 1 is a view of the combustion device of this embodiment as seen from the +X axis side. Fig. 2 is a view for explaining the arrangement of the first hydrogen supply pipe and the second hydrogen supply pipe in the combustion device of this embodiment. The combustion device 1 of this embodiment is, for example, a low NOx combustion device having a narrow combustion chamber. X It is suitable as a hydrogen burner.

[0016] 1 and 2, the combustion device 1 includes an air cone 2, a wind box 3, a first hydrogen supply pipe 4, a second hydrogen supply pipe 5, a partition pipe 6, a flame stabilizing plate 7, and a combustion chamber 8. The air cone 2 is a tube extending in the Y-axis direction, and has, for example, a cylindrical shape when viewed from the Y-axis direction.

[0017] 1, the wind box 3 is connected to the negative side of the Y axis of the air cone 2, and supplies air to the inside of the air cone 2. At this time, the air may be supplied from the inside of the wind box 3 to the inside of the air cone 2 via a fan (not shown).

[0018] Hydrogen is supplied to the first hydrogen supply pipe 4. As shown in Fig. 1, the first hydrogen supply pipe 4 passes through the inside of the wind box 3 and the inside of the air cone 2. The first hydrogen supply pipe 4 includes, for example, a first portion 4a, a second portion 4b, and a hydrogen outlet 4c.

[0019] 1, the first portion 4a extends in the Z-axis direction and is inserted into the wind box 3. The second portion 4b extends in the Y-axis direction and is passed through the inside of the air cone 2. The end portion of the second portion 4b on the negative Y-axis side is connected to the end portion of the first portion 4a on the positive Z-axis side, for example.

[0020] 1, the second portion 4b has a bottomed cylindrical shape with a closed end on the Y-axis + side. That is, the second portion 4b includes a peripheral wall portion 4d and a closing portion 4e, and, for example, the peripheral wall portion 4d may have a substantially cylindrical shape when viewed from the Y-axis direction.

[0021] At this time, the central axis of the second portion 4b is disposed approximately on the central axis of the air cone 2. That is, when viewed from the Y-axis direction, the second portion 4b is disposed approximately in the center of the air cone 2, as shown in Fig. 2. And, the end portion of the second portion 4b on the Y-axis + side protrudes from the air cone 2 on the Y-axis + side, as shown in Fig. 1.

[0022] The hydrogen outlet 4c is formed at the end of the peripheral wall 4d on the + side of the Y axis, as shown in Fig. 1. The hydrogen outlet 4c penetrates the peripheral wall 4d in the radial direction of the peripheral wall 4d, and is arranged at approximately equal intervals in the circumferential direction of the peripheral wall 4d, as shown in Fig. 2. Therefore, hydrogen supplied to the first hydrogen supply pipe 4 is blown out toward the radial outside of the peripheral wall 4d.

[0023] Hydrogen is supplied to the second hydrogen supply pipe 5, for example, via the first hydrogen supply pipe 4. As shown in Fig. 1, the second hydrogen supply pipe 5 branches off from the first hydrogen supply pipe 4 and passes through the inside of the air cone 2. The second hydrogen supply pipe 5 includes, for example, a first portion 5a, a second portion 5b, and a hydrogen outlet 5c.

[0024] 1, the first portion 5a protrudes from the peripheral wall portion 4d of the first hydrogen supply pipe 4 to the outside in the radial direction of the peripheral wall portion 4d. In other words, the end of the first portion 5a on the first hydrogen supply pipe 4 side is connected to the peripheral wall portion 4d of the first hydrogen supply pipe 4.

[0025] As shown in Figure 1, the second part 5b extends in the Y-axis direction, and the end of the second part 5b on the Y-axis negative side is connected to the end of the first part 5a on the opposite side to the first hydrogen supply pipe 4.

[0026] 1, the end portion of the second portion 5b on the + side of the Y axis protrudes to the + side from the same position on the Y axis as the air cone 2. In this case, it is preferable that the end portion of the second portion 5b on the + side of the Y axis is disposed at the same position from the - side of the Y axis with respect to the hydrogen outlet 4c of the first hydrogen supply pipe 4.

[0027] 2, hydrogen outlet 5c is formed by an opening on the +Y side of second portion 5b. Therefore, hydrogen supplied to second hydrogen supply pipe 5 is blown out from the end on the +Y side of second portion 5b toward the +Y side of the Y axis.

[0028] A plurality of such second hydrogen supply pipes 5 are arranged at approximately equal intervals in the circumferential direction of the peripheral wall portion 4d of the first hydrogen supply pipe 4 when viewed from the Y-axis direction. Therefore, a plurality of hydrogen outlets 5c of the second hydrogen supply pipe 5 are arranged at approximately equal intervals in the circumferential direction of the peripheral wall portion 4d of the first hydrogen supply pipe 4, as shown in FIG.

[0029] In this case, the second hydrogen supply pipe 5 preferably has eight or more hydrogen outlets 5c, as shown in Fig. 2. Moreover, in the circumferential direction of the peripheral wall portion 4d of the first hydrogen supply pipe 4, the hydrogen outlets 4c of the first hydrogen supply pipe 4 are preferably disposed between the hydrogen outlets 5c of the adjacent second hydrogen supply pipe 5. Therefore, when viewed from the radial direction of the peripheral wall portion 4d of the first hydrogen supply pipe 4, the hydrogen outlets 5c of the second hydrogen supply pipe 5 are preferably disposed on both sides of the hydrogen outlets 4c of the first hydrogen supply pipe 4.

[0030] 1 and 2, the partition pipe 6 is passed through the inside of the air cone 2. The partition pipe 6 has a cylindrical shape extending in the Y-axis direction, and the second portion 4b of the second hydrogen supply pipe 5 is passed through the partition pipe 6. In this case, it is preferable that the hydrogen outlet 4c of the first hydrogen supply pipe 4 is disposed between adjacent partition pipes 6 in the circumferential direction of the peripheral wall portion 4d of the first hydrogen supply pipe 4.

[0031] As shown in FIG. 1, the end of the partition tube 6 on the + side of the Y axis protrudes from the air cone 2 on the + side of the Y axis, and is positioned, for example, in a position in the Y axis direction that is approximately equal to the end of the second portion 5b of the second hydrogen supply pipe 5 on the + side of the Y axis.

[0032] Therefore, the air supplied to the air cone 2 enters through the opening at the end on the negative side of the Y axis of the partition pipe 6, is blown out from the opening at the end on the positive side of the Y axis of the partition pipe 6, and is supplied to the periphery of the hydrogen outlet 5c of the second hydrogen supply pipe 5. In other words, the periphery of the hydrogen outlet 5c of the second hydrogen supply pipe 5 becomes a mixing region for hydrogen and air.

[0033] As shown in Figures 1 and 2, the flame stabilizing plate 7 covers the opening at the end on the Y-axis + side of the air cone 2, with the second part 4b of the first hydrogen supply pipe 4, the second part 5b of the second hydrogen supply pipe 5, and the partition pipe 6 penetrating in the Y-axis direction.

[0034] Therefore, the end of the second portion 4b of the first hydrogen supply pipe 4 on the + side of the Y axis, the end of the second portion 5b of the second hydrogen supply pipe 5 on the + side of the Y axis, and the end of the partition tube 6 on the + side of the Y axis protrude from the flame stabilizing plate 7 on the + side of the Y axis, as shown in Figure 1.

[0035] 1, the combustion chamber 8 is disposed on the + side of the Y axis with respect to the air cone 2. The combustion chamber 8 is provided with a cone portion 8a whose diameter increases toward the + side of the Y axis, and the end portion of the cone portion 8a on the - side of the Y axis is fixed to the end portion of the air cone 2 on the + side of the Y axis.

[0036] As shown in FIG. 1, inside the cone portion 8a of the combustion chamber 8, the Y-axis + side end of the second portion 4b of the first hydrogen supply pipe 4, the Y-axis + side end of the second portion 5b of the second hydrogen supply pipe 5, and the Y-axis + side end of the partition pipe 6 are arranged.

[0037] Such a combustion device 1 may be configured, for example, as shown in Figures 1 and 2, so that combustion can be confirmed by a UV sensor 9 arranged so as to pass through the inside of the air cone 2 and be exposed to the Y-axis + side from the flame stabilizing plate 7.

[0038] Next, the combustion state of the combustion device 1 of this embodiment will be described. Fig. 3 is a diagram for explaining the combustion state of the combustion device of this embodiment. Note that Fig. 3 shows the combustion state and the flow of hydrogen and air in a simplified manner.

[0039] When air is supplied to the combustion device 1 having the above-mentioned configuration, as shown by the dashed line in Figure 3, the air passes through the inside of the air cone 2 and the inside of the partition tube 6, and is blown out toward the Y-axis + side from the opening at the end of the partition tube 6 on the Y-axis + side.

[0040] Furthermore, when hydrogen is supplied to the combustion device 1, as shown by the dotted line in Figure 3, the hydrogen passes through the first hydrogen supply pipe 4 and also through the second hydrogen supply pipe 5, and is blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 toward the radial outside of the peripheral wall portion 4d of the first hydrogen supply pipe 4, and is also blown out from the hydrogen outlet 5c of the second hydrogen supply pipe 5 toward the + side of the Y axis.

[0041] At this time, although detailed functions will be described later, it is preferable that the total amount of hydrogen blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 is four times the total amount of hydrogen blown out from the hydrogen outlets 5c of all the second hydrogen supply pipes 5. In addition, it is preferable that the flow rate of hydrogen blown out from the hydrogen outlets 5c of the second hydrogen supply pipe 5 is approximately 165 Nm / s or more.

[0042] As a result, hydrogen and air are mixed around the hydrogen outlet 4c of the first hydrogen supply pipe 4, and a low-air-ratio combustion flame F1 with a high hydrogen concentration is generated from the hydrogen outlet 4c toward the radially outer side of the peripheral wall portion 4d of the first hydrogen supply pipe 4. In other words, the hydrogen outlet 4c of the first hydrogen supply pipe 4 functions as the first flame B1 of the low-air-ratio combustion flame F1.

[0043] At the same time, hydrogen and air are mixed around the hydrogen outlet 5c of the second hydrogen supply pipe 5, and a high air ratio combustion flame F2 with a low hydrogen concentration is generated from the hydrogen outlet 5c toward the + side of the Y axis. In other words, the hydrogen outlet 5c of the second hydrogen supply pipe 5 functions as the second nozzle B2 of the high air ratio combustion flame F2.

[0044] These first burner B1 and second burner B2 are arranged on the +Y side of the flame stabilizing plate 7, and therefore it is possible to prevent the flame stabilizing plate 7 and the portion of the combustion device 1 on the -Y side of the flame stabilizing plate 7 from becoming red hot. Therefore, the combustion device 1 of this embodiment can prevent burn damage compared to the combustion device of Patent Document 1.

[0045] Here, when the number of second nozzles B2 is eight or more, the number of nozzles generating the high air ratio combustion flame in the combustion device of Patent Document 1 is six, whereas in the case of Patent Document 1, the number of nozzles generating the high air ratio combustion flame is large, and therefore the total surface area of ​​the high air ratio combustion flame is large, and slow combustion of the high air ratio combustion flame F2 is promoted. This makes it possible to lower the combustion temperature of the high air ratio combustion flame F2, and the thermal NO X The occurrence of the above can be suppressed.

[0046] At this time, the surface area of ​​the high air ratio combustion flame F2 is secured by increasing the number of second burners B2. Therefore, compared to the case where the surface area of ​​the high air ratio combustion flame F2 is secured by increasing the length of the high air ratio combustion flame F2 in the Y-axis direction, the thermal NOx can be generated well even in the combustion device 1 in which the length of the combustion chamber 8 in the Y-axis direction is short. X Therefore, the combustion device 1 of the present embodiment is a low NOx device having a narrow combustion chamber 8. X It is suitable as a hydrogen burner.

[0047] Moreover, when the end portion on the + side of the Y axis of the second portion 5b of the second hydrogen supply pipe 5 is disposed on the - side of the Y axis with respect to the hydrogen outlet 4c of the first hydrogen supply pipe 4, the first nozzle B1 is disposed on the + side of the Y axis with respect to the second nozzle B2. The low air ratio combustion flame F1 is generated radially outward from the peripheral wall portion 4d of the first hydrogen supply pipe 4, and the high air ratio combustion flame F2 is generated toward the + side of the Y axis.

[0048] Therefore, the low air ratio combustion flame F1 pushes the high air ratio combustion flame F2 toward the radially outer side of the peripheral wall portion 4d of the first hydrogen supply pipe 4, and the high air ratio combustion flame F2 is generated obliquely toward the radially outer side of the peripheral wall portion 4d of the first hydrogen supply pipe 4. At the same time, the air around the low air ratio combustion flame F1 and the high air ratio combustion flame F2 is used for combustion, so that the pressure around the low air ratio combustion flame F1 and the high air ratio combustion flame F2 becomes lower than the pressure in other regions.

[0049] As a result, as shown by the dashed arrow in Figure 3, the exhaust gas around the high air ratio combustion flame F2 self-circulates and is used for combustion of the low air ratio combustion flame F1. Therefore, a low O2 state can be created when the low air ratio combustion flame F1 occurs, and as a result, the low air ratio combustion flame F1 can be slowed down, and the thermal NO X The occurrence of the above can be suppressed.

[0050] At this time, the low air ratio combustion flame F1 and the high air ratio combustion flame F2 are generated toward the cone portion 8a of the combustion chamber 8, and the diameter of the cone portion 8a increases as it approaches the + side of the Y axis. This can promote self-circulation of exhaust gas around the low air ratio combustion flame F1 and the high air ratio combustion flame F2.

[0051] In addition, as shown in Figure 2, the hydrogen outlet 4c of the first hydrogen supply pipe 4 is positioned between the hydrogen outlets 5c of the adjacent second hydrogen supply pipes 5, i.e., between adjacent partition pipes 6, in the circumferential direction of the peripheral wall portion 4d of the first hydrogen supply pipe 4. Therefore, the hydrogen blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 is unlikely to immediately come into contact with the air blown out from the partition pipe 6.

[0052] Therefore, the mixing of the hydrogen blown out from the hydrogen blowout port 4c of the first hydrogen supply pipe 4 and the air blown out from the partition pipe 6 is slow, so that the low air ratio combustion flame F1 can be made slow, and the thermal NO X The occurrence of the above can be suppressed.

[0053] Here, for example, in order to meet an example of Tokyo's exhaust gas emission regulations, we consider the ratio between the total amount of hydrogen blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 and the total amount of hydrogen blown out from the hydrogen outlets 5c of all the second hydrogen supply pipes 5, and the flow rate of hydrogen blown out from the hydrogen outlets 5c of the second hydrogen supply pipes 5.

[0054] 4 is a diagram showing the results of examining the ratio between the total amount of hydrogen blown out from the hydrogen outlet of the first hydrogen supply pipe and the total amount of hydrogen blown out from the hydrogen outlets of all the second hydrogen supply pipes, as well as the flow rate of hydrogen blown out from the hydrogen outlets of the second hydrogen supply pipes, etc. Incidentally, the hydrogen flow rate is the flow rate of hydrogen blown out from the hydrogen outlet 5c of the second hydrogen supply pipe 5, and the air flow rate is the flow rate of air blown out from the partition pipe 6.

[0055] NO in exhaust gas XThe concentration of is regulated to 45 ppm or less in terms of 5% residual O2. As shown in Fig. 4, when the ratio of the total amount of hydrogen blown out from the hydrogen outlet 5c of all second hydrogen supply pipes 5 in levels 5 and 6 among levels 1 to 6 to the total amount of hydrogen blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 is 1:4, that is, when the total amount of hydrogen blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 is four times the total amount of hydrogen blown out from the hydrogen outlet 5c of all second hydrogen supply pipes 5, and when the flow rate of hydrogen blown out from the hydrogen outlet 5c of the second hydrogen supply pipe 5 is approximately 165 Nm / s or more, an example of the Tokyo exhaust gas regulation value can be satisfied.

[0056] Therefore, in the combustion device 1 of this embodiment, the total amount of hydrogen blown out from the hydrogen outlet 4c of the first hydrogen supply pipe 4 is four times the total amount of hydrogen blown out from the hydrogen outlets 5c of all the second hydrogen supply pipes 5, and the flow velocity of hydrogen blown out from the hydrogen outlets 5c of the second hydrogen supply pipes 5 is approximately 165 Nm / s or more.

[0057] At this time, since the flow rate of hydrogen blown out from the hydrogen blowing port 5c of the second hydrogen supply pipe 5 is faster at levels 5 and 6 than at other levels 1 to 4, the length of the high air ratio combustion flame F2 in the Y-axis direction can be increased. This ensures the surface area of ​​the high air ratio combustion flame F2, and promotes slow combustion of the high air ratio combustion flame F2. As a result, the combustion temperature of the high air ratio combustion flame F2 can be lowered, and the thermal NO X The occurrence of can be further suppressed.

[0058] In this manner, in the combustion device 1 of this embodiment, the first burner B1 and the second burner B2 are disposed on the +Y-axis side of the flame stabilizing plate 7, and therefore it is possible to prevent the flame stabilizing plate 7 and the portion of the combustion device 1 on the -Y-axis side of the flame stabilizing plate 7 from becoming red hot. Therefore, the combustion device 1 of this embodiment can prevent burn damage compared to the combustion device of Patent Document 1.

[0059] In addition, in the combustion device 1 of this embodiment, when the number of second nozzles B2 is eight or more, the number of nozzles generating the high air ratio combustion flame F2 is six in the combustion device of Patent Document 1, but since there are many nozzles generating the high air ratio combustion flame F2, the total surface area of ​​the high air ratio combustion flame F2 is large, and slow combustion of the high air ratio combustion flame F2 is promoted. This makes it possible to lower the combustion temperature of the high air ratio combustion flame F2, and the thermal NO X The occurrence of the above can be suppressed.

[0060] Moreover, in the combustion device 1 of this embodiment, by devising the positional relationship between the first burner B1 and the second burner B2 and the shape of the combustion chamber 8 as described above, it is possible to promote self-circulation of exhaust gas around the low air ratio combustion flame F1 and the high air ratio combustion flame F2, and to slow down the low air ratio combustion flame F1 and the high air ratio combustion flame F2, thereby improving the thermal NO X The occurrence of the above can be suppressed.

[0061] In addition, the combustion device 1 of this embodiment can reduce NO by adjusting the ratio between the total amount of hydrogen blown out from the hydrogen blowout ports 4c of the first hydrogen supply pipe 4 and the total amount of hydrogen blown out from the hydrogen blowout ports 5c of all the second hydrogen supply pipes 5, and the flow rate of hydrogen blown out from the hydrogen blowout ports 5c of the second hydrogen supply pipes 5. X This allows the exhaust gas regulation value to be met with a concentration of 45 ppm or less.

[0062] The present disclosure is not limited to the above-described embodiment, and can be modified as appropriate without departing from the spirit and scope of the present disclosure. For example, in the above embodiment, the second hydrogen supply pipe 5 branches off from the first hydrogen supply pipe 4, but the first hydrogen supply pipe 4 and the second hydrogen supply pipe 5 do not have to be connected. [Explanation of symbols]

[0063] 1 Combustion equipment 2. Air Cone 3. Windbox 4: first hydrogen supply pipe, 4a: first portion, 4b: second portion, 4c: hydrogen outlet, 4d: peripheral wall portion, 4e: blocking portion 5: second hydrogen supply pipe, 5a: first portion, 5b: second portion, 5c: hydrogen outlet 6 Bulkhead tube 7 Flame holding plate 8 Combustion chamber, 8a Cone section 9. UV Sensor B1 First crater B2 Second Crater F1 Low air ratio combustion flame F2 High air ratio combustion flame

Claims

1. A combustion device that burns a mixture of hydrogen and air, A flame retaining plate covering the opening of the air cone; a first hydrogen supply pipe passing through the inside of the air cone and protruding from the flame stabilizing plate outward relative to the air cone; a first nozzle disposed in a portion of the first hydrogen supply pipe protruding from the flame stabilizing plate, the first nozzle blowing out hydrogen in a direction perpendicular to a central axis of the first hydrogen supply pipe to generate a low-air-ratio combustion flame having a high concentration of hydrogen; a second hydrogen supply pipe that is disposed so as to surround the first hydrogen supply pipe when viewed from the direction in which the central axis of the first hydrogen supply pipe extends, passes through the inside of the air cone, and protrudes outward from the flame stabilizing plate relative to the air cone; a second nozzle that is disposed in a portion of the second hydrogen supply pipe that protrudes from the flame stabilizing plate, is parallel to a central axis of the first hydrogen supply pipe, and blows out hydrogen in a direction protruding from the flame stabilizing plate of the second hydrogen supply pipe to generate a high air ratio combustion flame having a low concentration of hydrogen; A combustion device comprising:

2. the second nozzles are arranged at intervals in a circumferential direction around a central axis of the first hydrogen supply pipe, 2. The combustion device according to claim 1, wherein the first burner nozzle is disposed between adjacent second burners in a circumferential direction about a central axis of the first hydrogen supply pipe.

3. a combustion chamber disposed on a side of the first hydrogen supply pipe in a direction protruding from the flame stabilizing plate with respect to the flame stabilizing plate, the combustion chamber expanding in diameter toward the side of the first hydrogen supply pipe in a direction protruding from the flame stabilizing plate, The first burner and the second burner are disposed inside the combustion chamber, 3. The combustion device according to claim 1, wherein the first burner nozzle is disposed on a side of the first hydrogen supply pipe in a direction protruding from the flame stabilizing plate with respect to the second burner nozzle.

4. 3. The combustion device according to claim 1, wherein a total amount of hydrogen blown out from all of the first hydrogen supply pipes is four times a total amount of hydrogen blown out from all of the second hydrogen supply pipes.

5. 3. The combustion device according to claim 1, wherein a flow velocity of the hydrogen blown out of the second hydrogen supply pipe is 165 Nm / s or more.

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