CN100402924C - Hydrogen combustion equipment with hydrogen tubes - Google Patents

Abstract

A hydrogen combustion device comprising a casing (30), a hydrogen source, a hydrogen pipe (39) for supplying hydrogen from the hydrogen source to the casing (30), a mixer (10) located on the downstream side of the pipe (39) , used to stir the mixed gas and burn the catalyst (20). The hydrogen pipe (39) has a hydrogen pipe body (40) and a hydrogen discharge portion (41) with a hydrogen discharge hole (42). In the hydrogen combustion device, the hydrogen discharge portion (41) is located at the substantially central portion of the cross-section of the air passage in the sleeve (30), extending along the flow direction of the air flow in the air passage. The hydrogen discharge holes (40) are arranged such that their axes extend radially of the hydrogen discharge portion (41), substantially perpendicular to the flow direction of the air flow.

Description

Hydrogen combustion equipment with hydrogen tubes

technical field

The invention relates to a hydrogen combustion device for generating hydrogen oxidation reaction heat through a catalyst. More specifically, the present invention relates to a hydrogen tube arranged in a hydrogen combustion device for directing hydrogen from a hydrogen source into the hydrogen combustion device.

Background technique

A conventional hydrogen burner, such as a hydrogen combustion device disclosed in Japanese Patent Application Publication No. 2002-122311, allows a mixture of hydrogen and air to be exposed to a catalyst to generate oxidation reaction heat as a heat source. In the hydrogen combustion equipment, the hydrogen pipe is set in the air flow supply channel and adjusted so that the hydrogen is injected to generate the mixed gas.

When set up, the hydrogen tube is set so as to intersect the cross-section of the air flow supply channel in a substantially diametrical direction. In addition, the hydrogen gas pipes are formed with hydrogen gas discharge ports at the intersecting portions of the pipes to eject hydrogen gas.

In the above-mentioned conventional hydrogen combustion equipment, the hydrogen pipe has a hydrogen discharge port whose number and position can be adjusted according to the speed, flow rate, etc. of the air flow in order to effectively mix the hydrogen discharged from the hydrogen discharge port with the air flow.

As a result, the structure of the hydrogen pipe including the number and positions of the hydrogen discharge ports tends to be complicated, and therefore simulations and experiments must be repeatedly performed to determine the number and positions of the hydrogen discharge ports, thereby resulting in the fabrication of the hydrogen pipe at its hydrogen discharge portion Costs are raised.

Further, since the hydrogen discharge port is arranged against the air flow to effectively mix the hydrogen and the air flow, hydrogen must be discharged against the dynamic pressure of the air flow. Therefore, as the accuracy of the hydrogen gas supply route increases, the hydrogen gas supply pressure must also be increased in terms of leak-tightness performance.

Contents of the invention

Under such circumstances, an object of the present invention is to provide a hydrogen combustion device having a hydrogen pipe capable of simplifying the structure of the hydrogen discharge port and reducing the supply of hydrogen by utilizing the arrangement of the hydrogen discharge portion of the pipe with improved relative air flow pressure.

According to a first aspect of the present invention, the above-mentioned object is achieved by a hydrogen combustion device comprising: a casing having an air flow channel formed therein; a hydrogen source arranged outside the casing; The source extends into the hydrogen tube of the air flow channel, thereby supplying hydrogen from the hydrogen source into the air flow flowing in the casing, the hydrogen tube has a hydrogen tube body and a hydrogen discharge part arranged at the front end of the hydrogen tube body, and is also provided with a plurality of hydrogen discharge ports; a mixer provided near the hydrogen pipe for stirring the mixed gas; and a combustion catalyst provided on the downstream side of the mixer in the flow direction of the air flow to cause an oxidation reaction of the mixed gas to generate heat, wherein The hydrogen gas discharge portion is located at the substantially center position of the cross-section of the channel formed in the bushing, and is also arranged to extend along the flow direction of the air flow, the hydrogen gas discharge holes are arranged so that their axes extend radially of the hydrogen gas discharge portion, substantially perpendicular to the flow direction of the air stream.

Then, since the hydrogen gas discharge portion is provided at the substantially central position of the channel cross section so as to extend along the flow direction of the air flow, it is possible to provide the hydrogen gas discharge portion with a hydrogen gas discharge hole whose axis is along a radius of the hydrogen gas discharge portion perpendicular to the air flow. to extend. As a result of this formation, the hydrogen gas discharged from the hydrogen gas discharge holes can be effectively mixed with the air flow.

Therefore, if a plurality of hydrogen discharge holes are formed at substantially regular intervals only in the circumferential direction of the hydrogen discharge portion, the entire structure of the hydrogen discharge holes can be simplified to reduce the manufacturing cost of the hydrogen discharge portion.

According to a second aspect of the present invention, in the above-structured hydrogen combustion apparatus, the hydrogen discharge portion is arranged to face the upstream side of the air flow, and has a tapered front end.

Due to the tapered front end, the air flow can flow smoothly around the hydrogen gas discharge portion along the tapered front end, and the generation of vortex flow on the upstream side of the hydrogen gas discharge hole can be suppressed, so that the hydrogen gas discharged from the hydrogen gas discharge hole can be effectively mixed with the air flow .

According to a third aspect of the present invention, the hydrogen gas discharge portion is formed to have the same diameter as the hydrogen gas pipe body, and the hydrogen gas discharge portion is vertically welded to the hydrogen gas pipe body.

In this case, the structure of the hydrogen tube as a whole can be simplified.

According to the fourth aspect of the present invention, the hydrogen pipe is arranged such that the hydrogen discharge portion is located on the upstream side of the mixer in the flow direction of the air flow, while the hydrogen pipe body is located inside the mixer.

In the above-described hydrogen tube, the interval between the hydrogen tube body and the mixer can be eliminated, so that the overall length of the hydrogen combustion equipment can be shortened, and the entire hydrogen combustion equipment can be miniaturized.

According to a fifth aspect of the present invention, the hydrogen discharge holes have different diameters.

According to the sixth aspect of the present invention, combined with the fifth aspect of the present invention, the hydrogen discharge hole on the upstream side of the hydrogen flow direction of the straight portion of the hydrogen pipe body and the downstream side of the hydrogen flow direction on the straight portion of the hydrogen pipe body Compared with the hydrogen gas discharge hole, it is formed with a smaller diameter.

In this case, the hydrogen discharge holes on the downstream side in the hydrogen flow direction receive a large inertial force of the hydrogen flow. However, since the hydrogen gas discharge hole on the downstream side of the flow of hydrogen gas has a small diameter, the flow resistance of hydrogen gas passing through the hole increases. At the same time, the hydrogen discharge holes on the upstream side of the hydrogen flow direction are subjected to a small inertial force of the hydrogen flow. However, since the hydrogen gas discharge hole on the upstream side of the flow of hydrogen gas has a large diameter, the flow resistance of hydrogen gas passing through the hole is reduced. In this manner, hydrogen gas can be uniformly discharged through two kinds of hydrogen gas discharge holes having a large diameter and a small diameter due to a canceling effect between the inertial force of hydrogen gas flow and the flow resistance.

These and other objects and features of the present invention will become more fully apparent from the following description and appended claims when read in conjunction with the accompanying drawings.

Description of drawings

1 is a sectional view of an essential part of a hydrogen combustion apparatus according to a first embodiment of the present invention, which extends from a hydrogen pipe to an electrically heated catalyst;

Figure 2 is a perspective view of a mixer and an electrically heated catalyst according to a first embodiment of the present invention;

Figure 3 is a perspective view of an electrically heated catalyst according to a first embodiment of the present invention;

4 is a cross-sectional view of a hydrogen supply portion of a hydrogen pipe according to a first embodiment of the present invention;

Fig. 5 is a sectional view along the V-V line of Fig. 4;

6 is a cross-sectional view of a hydrogen supply portion of a hydrogen pipe according to a second embodiment of the present invention;

7 is a cross-sectional view of a hydrogen supply portion of a hydrogen pipe according to a third embodiment of the present invention;

8 is a sectional view of an essential part of a hydrogen combustion apparatus according to a fourth embodiment of the present invention, which extends from a hydrogen pipe to an electrically heated catalyst; and

Fig. 9 is a sectional view of essential parts of a hydrogen combustion apparatus according to a fifth embodiment of the present invention, which extends from a hydrogen pipe to an electrically heated catalyst.

Detailed ways

Embodiments of the present invention will be described below with reference to the accompanying drawings.

[the first embodiment]

1 to 5 show hydrogen pipes of a hydrogen combustion apparatus according to a first embodiment of the present invention. In these drawings, Fig. 1 is a sectional view of the essential part extending from the hydrogen tube to the electrically heated catalyst, Fig. 2 is a perspective view of the mixer and the electrically heated catalyst, Fig. 3 is a perspective view of the electrically heated catalyst, and Fig. 4 is the hydrogen gas A cross-sectional view of the hydrogen supply portion of the tube, FIG. 5 is a cross-sectional view along line V-V in FIG. 4 .

Hydrogen combustion equipment is a unit that generates combustion heat by using hydrogen as fuel. The hydrogen combustion apparatus includes a mixer 10 for mixing hydrogen supplied from a hydrogen source (compressed hydrogen tank) and air from an air blower (not shown) to generate a uniformly mixed gas, and an electrically heated catalyst 20 for heating and The heat of combustion is generated by burning a homogeneously mixed gas, as shown in Figures 1 and 2. Combustion gas generated by electrically heating the catalyst 20 is supplied to an unillustrated combustion catalyst provided on the downstream side of the catalyst 20 so as to be heated to a temperature sufficient for catalytic reaction.

Further, the sufficiently heated combustion catalyst allows the mixed gas to be oxidized to generate high temperature combustion gas. Then, the high-temperature combustion gas is supplied to an unillustrated heat exchanger for heat exchange, which has a heat exchange medium (for example, purified water) that obtains combustion heat by a combustion catalyst. Note that the operation of the heat exchanger is described in Japanese Patent Application Publication No. 2002-122311.

Meanwhile, the mixer 10 includes a plurality of continuous mixing plates as air flow channels provided in a cylindrical sleeve 30, into which a mixed gas of hydrogen and air is introduced. In the illustrated embodiment, the mixing plates consist of a first mixing plate 11 , a second mixing plate 12 and a third mixing plate 13 arranged sequentially from the upstream side of the air flow. These mixing plates 11, 12, 13 are arranged in such a manner that their surfaces are respectively perpendicular to the central axis of the casing 30. Further, the mixing plates 11, 12, 13 are attached to the sleeve 30 at appropriate intervals in the flow direction of the mixed gas.

As shown in FIG. 2 , the first mixing plate 11 on the most upstream side in the flow direction of the mixed gas (ie, the left side in the figure) is annular and has a central opening 11a with a large diameter D1. The middle second mixing plate 12 has four openings 12 a of a middle diameter D2 , each in the circumferential direction of the plate 12 . The third mixing plate 13 on the downstream side (ie, the right side in the figure) has many openings 13a (18 openings in this embodiment) each having a small diameter D3. For example, the sleeve 30 has an inner diameter of 57.5 mm, the plates 11 to 13 have a diameter D1 of 35 mm, a diameter D2 of 19 mm and a diameter D3 of 9 mm.

Passing through the opening 11a of the first mixing plate 11, the mixed gas entering from the left side of the figure is split at the opening 12a of the second mixing plate 12, and then divided into smaller ones at the opening 13a of the third mixing plate 13. airflow. During passing through the plates 12 , 13 , the mixed gas is stirred to uniformly mix hydrogen and oxygen, and is further supplied to the electrically heated catalyst 20 .

As shown in FIG. 3, an electrically heated catalyst 20 is provided by winding a flat plate 21 placed on a corrugated plate 22, both of which carry a catalyst consisting of 1 wt% of platinum (Pt) and the remainder of alumina (Al ₂ O ₃ ). , and the resulting device is then installed in the sleeve 30 under pressure. The electrically heated catalyst 20 thus constituted has many cells 33 to allow the mixed gas to pass between the flat plate 21 and the corrugated plate 22 .

In order to heat the electrically heated catalyst 20 , an electrode 24 is attached to the center of the electrically heated catalyst 20 , while another electrode 25 is attached to the peripheral portion of the catalyst 20 . During operation, electrically heated catalyst 20 is heated by passing electrical current between electrodes 24 and 25 .

After once extending from the electrically heated catalyst 20 in the direction in which the mixed gas is introduced, the front end of the electrode 24 is led to the outside of the sleeve 30 through the insulating member 26 . The other electrode 25 is led to the outside of the sleeve 30 through a further insulating element 27 .

In a first embodiment, as shown in FIG. 1 , a hydrogen tube 39 is provided so as to extend into the cannula 30 from the aforementioned hydrogen source (not shown). The hydrogen pipe 39 is composed of a pipe body 40 connected to the hydrogen source into the casing 30 and a cylindrical cap (hydrogen gas discharge part) 41 installed on the front end 40a of the pipe body 40 . In the casing 30, a pipe body (portion) 40 is provided on the upstream side of the mixer 10 in the flow direction of the gas flow so as to generate mixed gas. The pipe body (portion) 40 leaves the mixer 10 at a space S. Note that the said interval S represents the distance between the center of the section of the pipe body 40 extending along the flow direction of the air flow and the front surface of the first mixing plate 11 of the mixer 10 .

Repeatedly, as shown in FIG. 4, the front end 40a of the hydrogen tube 40 is tightly fixed to the hydrogen discharge portion 41 in the form of a cylindrical cap. The front end of the hydrogen discharge portion 41 is closed by a closing plate 41a. Furthermore, the hydrogen discharge portion 41 has a plurality of hydrogen discharge holes 42 .

A substantial portion of the tubular body 40 is configured to extend inwardly from the bottom side of the sleeve 30 towards the radial direction of the sleeve 30 . Further, a portion of the pipe body (portion) 40 near the front end 40a is bent so as to be substantially perpendicular to the rest of the pipe body 40 while being bent toward the upstream side of the gas flow. Due to this constitution, the hydrogen discharge portion 41 of the pipe body is positioned at the substantially central portion of the cross section of the sleeve 30 while extending in the direction of the air flow (left-right direction in the figure).

In the first embodiment, as shown in FIG. 5 , four hydrogen discharge holes 42 are formed at regular intervals in the circumferential direction of the hydrogen discharge portion 41 . In other words, these hydrogen discharge holes 42 are arranged such that their axes (see arrows in FIG. 5 ) extend radially of the hydrogen discharge portion 41, substantially perpendicular to the flow direction of the air flow. In the hydrogen discharge holes 42 shown in FIG. 5, the two upper holes 42a are formed as small holes, while the two lower holes 42b are formed as large holes.

Hydrogen, supplied from a hydrogen source (not shown) through the hydrogen pipe body 40 to the hydrogen discharge portion 41, is discharged from the hydrogen discharge hole 42 into the air flow of the sleeve 30, thereby generating a mixed gas. Then, the mixed gas is uniformly stirred and then supplied to the electrically heated catalyst 20 .

In the hydrogen combustion equipment of the first embodiment, due to the above-mentioned arrangement of the hydrogen discharge portion 41 and the hydrogen discharge hole 42, hydrogen can be injected into the air stream radially from the hydrogen discharge hole 42, whereby the hydrogen can be effectively mixed with the air. mix.

Further, since the plurality of hydrogen discharge holes 42 are simply arranged at substantially regular intervals in the circumferential direction of the hydrogen discharge portion 41 , the structure of the hydrogen discharge holes 42 can be simplified to reduce the manufacturing cost of the hydrogen discharge portion 41 .

In addition, since the hydrogen discharge hole 42 is substantially perpendicular to the air flow, the dynamic pressure of the air flow is substantially incapable of acting on the hydrogen discharge hole 42, whereby hydrogen gas can be discharged into the air flow even if the hydrogen pressure is small. Therefore, the supply pressure of hydrogen gas can be reduced, thus allowing the structure of supplying hydrogen gas to be simplified.

In addition, it should be noted that the hydrogen discharge hole 42a located on the upper side of the hydrogen discharge portion 41 in FIG. The remaining hydrogen discharge holes 42b are on the upstream side of the hydrogen flow direction indicated by the outline arrow in FIG. 5 . The pipe body 40 has a bent portion. The diameter of the hydrogen gas discharge hole 42a on the outer circumferential side of the bent portion is smaller than the diameter of the hydrogen gas discharge hole 42b on the inner circumferential side of the bent portion. Also note that the hydrogen gas entering the hydrogen gas discharge portion 41 through the hydrogen gas pipe 40 applies a higher pressure to the upper hydrogen gas discharge hole 42a than to the lower hydrogen gas discharge hole 42b due to the inertial force of the gas flow. However, since the diameter of the lower hydrogen discharge hole 42b is larger than that of the upper hydrogen discharge hole 42a, the lower hydrogen discharge hole 42b is easy to eject hydrogen, so that hydrogen can be uniformly discharged from the entire hydrogen discharge hole 42.

In detail, the hydrogen gas discharge hole 42a on the downstream side in the hydrogen gas flow direction receives a large inertial force of the flowing hydrogen gas. However, since the hydrogen gas discharge holes 42a on the downstream side of the flow of hydrogen gas have a small diameter, the flow resistance of hydrogen gas passing through these holes 42a increases. At the same time, the hydrogen discharge hole 42b on the upstream side of the hydrogen flow direction receives a small inertial force of the flowing hydrogen. However, since the hydrogen gas discharge holes 42b on the upstream side of the flow of hydrogen gas have a large diameter, the resistance to the flow of hydrogen gas passing through these holes 42b is reduced. In this way, hydrogen can be uniformly ejected through the two kinds of hydrogen discharge holes 42a, 42b having large and small diameters due to the offsetting effect between the inertial force of the hydrogen flow and the flow resistance.

[Second embodiment]

Figure 6 shows a second embodiment of the invention. In this embodiment, elements similar to those of the first embodiment are respectively denoted by the same reference numerals and repeated descriptions are omitted.

FIG. 6 is a sectional view showing that the hydrogen gas discharge portion 41 and the hydrogen gas tube body 40 form the hydrogen gas tube 39 . According to this embodiment, the hydrogen tube body 40 is arranged to face the upstream side of the air flow and is also provided with a tapered front end 43 .

During operation, since the air flow can smoothly flow around the hydrogen gas discharge portion 41 along the tapered front end 43, generation of vortex on the upstream side of the hydrogen gas discharge hole 42 can be suppressed, whereby the hydrogen gas discharged from the hole 42 can be effectively mixed with the air. flow mix. Note that the hydrogen discharge holes 42 have different diameters, as in the first embodiment.

[the third embodiment]

Figure 7 shows a third embodiment of the present invention. In this embodiment, elements similar to those of the first embodiment are respectively denoted by the same reference numerals and repeated descriptions are omitted.

FIG. 7 is a sectional view showing that the hydrogen gas discharge portion 41 and the hydrogen gas tube body 40 form the hydrogen gas tube 39 . According to this embodiment, the hydrogen discharge portion 41 is formed to have the same diameter as the hydrogen pipe body 40 . In addition, the hydrogen discharge portion 41 thus constituted is vertically welded to the hydrogen pipe body 40 .

Also in this embodiment, four hydrogen discharge holes 42 are formed at regular intervals in the circumferential direction of the hydrogen discharge portion 41 . Of course, these hydrogen discharge holes 42 are arranged so that their axes extend radially of the hydrogen discharge portion, substantially perpendicular to the flow direction of the air flow. According to this embodiment, the structure and configuration of the hydrogen tube 39 can be simplified by combining different elements of the same diameter. In addition, compared with the first embodiment, there is no need to form the hydrogen discharge portion 41 and the hydrogen pipe body 40 with high precision because welding is employed for the connection between the portion 41 and the body 40 .

Other effects and operations of this embodiment are similar to those of the first embodiment.

[the fourth embodiment]

Fig. 8 shows a fourth embodiment of the present invention. In this embodiment, elements similar to those of the first embodiment are respectively denoted by the same reference numerals and repeated descriptions are omitted.

Fig. 8 is a sectional view of an essential part of a hydrogen combustion device, which extends from a hydrogen tube to an electrically heated catalyst. According to this embodiment, the hydrogen pipe body (portion) 40 is provided in the mixer 10, while the hydrogen discharge portion 41 is provided on the upstream side of the mixer 10 in the flow direction of the air flow.

In detail, the hydrogen pipe body 40 is partially provided to extend between the first mixing plate 11 and the second mixing plate 12 . At substantially the center of the cross section of the bushing 30, the front portion of the pipe body 40 is bent such that its front end passes through the opening 11a of the first plate 11 and faces the upstream side of the air flow.

According to this embodiment, due to the arrangement of the hydrogen pipe 40 in the mixer 10, the space S (see FIG. 1 ) required between the pipe body 40 and the mixer 10 in the first embodiment can be eliminated, whereby the hydrogen combustion equipment The overall length can be shortened, miniaturizing the entire device including the hydrogen combustion equipment.

Of course, also in this arrangement, regardless of the arrangement of the hydrogen gas pipe 40 described above, since the hydrogen gas discharge portion 41 is located on the upstream side of the mixer 10, the mixed gas can be generated on the upstream side of the mixer 10, and thus the mixer 10 can be fully utilized. stirring function.

[the fifth embodiment]

Fig. 9 shows a fifth embodiment of the present invention. In this embodiment, elements similar to those of the first embodiment are respectively denoted by the same reference numerals and repeated descriptions are omitted.

Fig. 9 is a sectional view of an essential part of a hydrogen combustion device extending from a hydrogen tube to an electrically heated catalyst. According to this embodiment, the hydrogen discharge portion 41 is provided at the front end 40a of the hydrogen pipe body 40 so as to face the downstream side of the air flow.

Of course, also in this embodiment, the hydrogen discharge portion 41 is located at the approximate center of the sleeve 30, and is further arranged to extend along the flow direction of the air flow.

Accordingly, the effects and operations of the present embodiment are similar to those of the first embodiment.

Finally, those skilled in the art should understand that the foregoing descriptions only disclose some embodiments of hydrogen combustion equipment with hydrogen pipes. Apart from these embodiments, various changes and modifications can be made to the present invention without departing from the scope of the present invention.

Industrial Applicability

Since the hydrogen gas discharge portion is provided at approximately the central portion of the channel cross section so as to extend along the flow direction of the air flow, it is possible to provide the hydrogen gas discharge portion with a hydrogen gas discharge hole whose axis is perpendicular to the radial direction of the hydrogen gas discharge portion of the air flow. extend. As a result of this formation, the hydrogen gas discharged from the hydrogen gas discharge holes can be effectively mixed with the air flow.

Therefore, if a plurality of hydrogen discharge holes are formed at substantially regular intervals only in the circumferential direction of the hydrogen discharge portion, the entire structure of the hydrogen discharge holes can be simplified to reduce the manufacturing cost of the hydrogen discharge portion.

Claims (7)

1. A hydrogen combustion device, comprising: a sleeve having air flow passages formed therein; a source of hydrogen disposed outside the casing; A hydrogen tube arranged to extend from a source of hydrogen into the air flow channel whereby hydrogen is supplied from the source of hydrogen into the stream of air flowing within the casing, the hydrogen tube having a hydrogen tube extending from a side wall of the casing into an interior of the casing body and the hydrogen discharge part arranged at the front end of the hydrogen pipe body, and also has multiple hydrogen discharge ports; A mixer arranged near the hydrogen gas pipe for stirring the mixed gas; and a combustion catalyst provided on the downstream side of the mixer in the direction of the airflow flow to cause an oxidation reaction of the mixed gas to generate heat, wherein the hydrogen discharge portion is located at the center position of the cross-section of the passage formed in the bushing, and is also arranged to extend along the flow direction of the air flow and face the upstream side of the air flow, and The hydrogen discharge holes are arranged such that their axes extend radially of the hydrogen discharge portion, perpendicular to the flow direction of the air flow. 2. The hydrogen combustion apparatus of claim 1, wherein the hydrogen discharge portion has a tapered front end. 3. The hydrogen combustion apparatus of claim 1, wherein the hydrogen discharge portion is formed to have the same diameter as the hydrogen pipe body, and the hydrogen discharge portion is vertically welded to the hydrogen pipe body. 4. The hydrogen combustion apparatus of claim 1, wherein the hydrogen pipe is arranged such that the hydrogen discharge portion is located on the upstream side of the mixer in the flow direction of the air flow, while the hydrogen pipe body is located inside the mixer. 5. The hydrogen combustion apparatus of claim 1, wherein the hydrogen discharge holes have different diameters. 6. The hydrogen combustion device of claim 5, wherein the hydrogen pipe body has a straight line part extending from the side wall of the sleeve pipe into the inside of the sleeve pipe and a curved portion bent to make the hydrogen discharge part arranged along the flow direction of the air stream, Wherein the diameter of the hydrogen discharge hole on the upstream side of the hydrogen flow direction of the straight portion of the hydrogen pipe body is smaller than the diameter of the hydrogen discharge hole on the downstream side of the hydrogen flow direction of the straight portion of the hydrogen pipe body. 7. The hydrogen combustion equipment of claim 5, wherein the hydrogen pipe body has a straight line part extending into the inside of the sleeve pipe from the side wall of the sleeve pipe and a curved portion bent to make the hydrogen discharge part arranged along the flow direction of the air stream, Wherein the diameter of the hydrogen gas discharge hole on the side surface along the outer circumference side of the curved portion is smaller than the diameter of the hydrogen gas discharge hole on the side surface along the inner circumference side of the curved portion of the hydrogen pipe body.

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