JP7248743B2 - Combustion equipment - Google Patents

Description

The present disclosure relates to combustion equipment.

In Patent Document 1, openings are formed by bending a plurality of water tubes that form the walls of a furnace, and a burner is inserted into the openings to expose it to high-temperature gas generated by combustion of fuel in the furnace. A technique for reducing the burner portion is disclosed.

JP 2020-079660 A

Nitrogen oxides (NOx) are produced when fuel is burned in a furnace. It is desirable to suppress the generation of NOx as much as possible. One means of reducing NOx generation is to reduce the temperature of the flame formed when the fuel is burned. However, Patent Document 1 does not disclose or suggest reducing the flame temperature with a water tube.

The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a combustion facility capable of reducing the flame temperature and suppressing the generation of NOx using a water tube.

In order to achieve the above object, a combustion facility according to the present disclosure includes a plurality of water tubes forming a wall surface of a furnace, and a burner for ejecting gas fuel into the furnace, wherein at least one of the plurality of water tubes A book is provided to traverse the flame formed by the burner.

According to the combustion equipment of the present disclosure, the water tube can reduce the flame temperature and suppress the generation of NOx.

It is a figure showing roughly composition of combustion equipment concerning one embodiment. It is a perspective view which expands and shows a part of wall surface of the furnace which concerns on one Embodiment. It is a figure which shows roughly the structure of the burner which concerns on one Embodiment. FIG. 4 is a diagram schematically showing the configuration of a plurality of water tubes according to one embodiment; 5 is a diagram illustrating the layout of a plurality of water pipes shown in FIG. 4; FIG. FIG. 4 illustrates a layout of multiple water tubes according to some embodiments; FIG. 10 illustrates a configuration of a second contact water tube according to some embodiments;

Combustion equipment according to embodiments of the present disclosure will be described below based on the drawings. Such an embodiment shows one aspect of the present disclosure, does not limit the present disclosure, and can be arbitrarily changed within the scope of the technical idea of the present disclosure.

(Configuration of combustion equipment)
FIG. 1 is a diagram schematically showing the configuration of combustion equipment 1 according to one embodiment. As illustrated in FIG. 1 , the combustion facility 1 includes a furnace 2 and a burner 4 for ejecting gas fuel F into the furnace 2 . Such a combustion facility 1 is, for example, a boiler, and generates a high-temperature combustion gas G by burning the gas fuel F ejected into the furnace 2 to form a flame X, and this high-temperature combustion gas Steam is produced by recovering heat from G. The heat of the combustion gas G may be recovered by a heat exchanger provided inside the furnace 2 or may be recovered by a heat exchanger provided outside the furnace 2 .

The furnace 2 has a cylindrical shape and is provided with an internal space 3 for burning the gas fuel F ejected from the burner 4 . FIG. 2 is a perspective view showing an enlarged part of the wall surface 8 of the furnace 2 according to one embodiment. As illustrated in FIG. 2, the wall surface 8 of the furnace 2 is composed of a plurality of water tubes 6 (furnace wall tubes). With this configuration, the heat generated by the combustion of the gaseous fuel F is heat-exchanged with the water supply and steam flowing through the water pipe 6, so that the temperature rise of the wall surface 8 of the furnace 2 is suppressed. In the form illustrated in FIG. 2, a plurality of water pipes 6 are connected to each other by fins 10 (using a so-called membrane structure). In this case, the wall surface 8 of the furnace 2 is composed of a plurality of water tubes 6 and fins 10 .

FIG. 3 is a diagram schematically showing the configuration of the burner 4 according to one embodiment. In one embodiment, as illustrated in FIG. 3 , the burner 4 is provided in a burner throat 12 that opens the side wall of the furnace 2 . The burner throat part 12 is made of a refractory material and includes an inclined surface 14 that widens the opening 13 toward the inner space 3 of the furnace 2 . The opening 13 of the burner throat portion 12 has, for example, a circular shape when viewed in the extending direction along which the central axis C of the burner 4 extends.

Below, the extending direction in which the central axis C of the burner 4 extends is defined as the axial direction D1 of the burner 4 . In the present disclosure, the axial direction D1 of the burner 4 is flat with respect to the horizontal direction. In the axial direction D1 of the burner, the direction toward the internal space 3 of the furnace 2 is defined as the front side of the axial direction D1, and the direction away from the internal space 3 of the furnace 2 is defined as the rear side of the axial direction D1. A vertical direction D2 is defined as a direction perpendicular to the axial direction D1 of the burner 4 (flat direction with respect to the horizontal direction).

The burner 4 ejects gas fuel F into the furnace 2 (internal space 3). In one embodiment, the burner 4 includes a nozzle 16, a primary air flow path 18, and a secondary air flow path 20, as illustrated in FIG.

The nozzle 16 extends along the axial direction D1 and has a cylindrical shape. The axis of this nozzle 16 coincides with the central axis C of the burner 4 . Inside the nozzle 16, a channel is formed through which the gas fuel F flows forward in the axial direction D1. The gas fuel F is structured to be jetted into the furnace 2 from a main hole 26 and a secondary hole 28 formed in the front end portion 17 of the nozzle 16 .

In one embodiment, the nozzle 16 is connected to a hydrogen gas tank 29 in which hydrogen gas is stored and the gas fuel F comprises hydrogen. That is, the burner 4 is a combustion device using hydrogen as fuel. The burner 4 may burn only hydrogen, or may burn hydrogen and a fuel (by-product gas) other than hydrogen. Byproduct gases include, for example, methane, ethane, propane, butane, carbon monoxide, nitrogen, and the like. The by-product gas may be stored in the hydrogen gas tank 29 together with the hydrogen gas. And, in one embodiment, the gas fuel F does not contain a carbon component.

Note that the present disclosure does not limit the gas fuel F to include hydrogen. Alternatively, the gas fuel F is not limited to not containing carbon components. The gas fuel F may be city gas containing methane or the like or LPG containing propane or the like. The pulverized coal from the burner 3 is opened in the furnace wall 1 for ejecting into the high-temperature furnace 2, and is directed to the surface of the refractory material 20 to the opening 4 formed in the throat shape of the refractory material 20. An ejection port 23 for ejecting a cooling body such as air is provided.

A primary air flow path 18 is formed on the outer circumference of the nozzle 16, and the primary air A1 flows therethrough. In the form illustrated in FIG. 3 , the burner 4 comprises a cylindrical primary sleeve 22 extending along the axial direction D1 of the burner 4 . The inner diameter of primary sleeve 22 is greater than the outer diameter of nozzle 16 such that nozzle 16 is disposed within primary sleeve 22 . A primary air flow path 18 is formed between the primary sleeve 22 and the nozzle 16 .

The secondary air flow path 20 is formed around the outer circumference of the primary air flow path 18, through which the secondary air A2 flows. In the form illustrated in FIG. 3 , the burner 4 includes a cylindrical secondary sleeve 24 provided on the outer peripheral side of the primary sleeve 22 and extending along the axial direction D1 of the burner 4 . The inner diameter of the secondary sleeve 24 is greater than the outer diameter of the primary sleeve 22 such that the primary sleeve 22 is positioned within the secondary sleeve 24 . A secondary air flow path 20 is formed between a secondary sleeve 24 and a primary sleeve 22 . In some embodiments, although not shown, the burner 4 includes a tertiary air channel formed around the secondary air channel 20 .

The primary air A1 is set so that the ratio of air to gas fuel F is less than one. The air ratio means the ratio of the amount of air when the amount of air required to completely burn the gas fuel F is set to 1. In one embodiment, the air ratio of primary air A1 is less than the air ratio of secondary air A2. In one embodiment, the sum of the air ratio of primary air A1 and the air ratio of secondary air A2 is greater than or equal to one. That is, the burner 4 is configured to burn the gas fuel F completely. In some embodiments, although not shown, the combustion equipment 1 includes an air supply port that is provided separately from the burner throat portion 12 and supplies air into the furnace 2 . The combustion facility 1 is configured so that the unburned gas fuel F that has not been completely burned by the combustion of the burner 4 is completely combusted by the air supplied from the air supply port.

In the form illustrated in FIG. 3, the burner 4 includes a swirler 30 (flame stabilizer) provided at the outlet portion of the primary air flow path 18 mainly for flame stabilization. Although the primary air A1 flowing through the primary air flow path 18 is a straight flow, the swirler 30 is configured to impart a swirling force to some or all of the primary air A1.

In the form illustrated in FIG. 3, the burner 4 comprises a wind box 36 supplied with both primary air A1 and secondary air A2. The wind box 36 is a box-shaped member and communicates with the inlet 31 of the primary air flow path 18 and the inlet 33 of the secondary air flow path 20 respectively.

At least one of the plurality of water tubes 6 is provided so as to traverse the flame X formed by the burner 4 . In one embodiment, as illustrated in FIG. 3, the water pipe 6 includes a contact water pipe 6A (6) extending along the vertical direction D2.

The contact water pipe 6A extends linearly along the vertical direction D2, and at least a portion thereof is connected to a crossing portion 38 crossing the formation region R of the flame X and an upper end 40 of the crossing portion 38. It includes an upper water tube section 42 extending upwardly from an upper end 40 of 38 and a lower water tube section 46 connected to a lower end 44 of transverse section 38 and extending downwardly from lower end 44 of transverse section 38 .

A formation region R of the flame X is formed in the space in front of the burner 4 in the internal space 3 of the furnace 2 . The formation region R of the flame X varies depending on the components contained in the gas fuel F, the ejection pressure of the gas fuel F ejected from the nozzle 16, etc., but can be estimated in advance.

In the form illustrated in FIG. 3 , the transverse portion 38 faces the opening 13 of the burner throat portion 12 and extends linearly through the formation region R of the flame X (the space in front of the burner 4). Each of the upper water tube portion 42 and the lower water tube portion 46 is fixed to each of the burner throat portion 12 and the wind box 36 by, for example, welding.

The combustion equipment 1 may be provided with one contact water pipe 6A, or may be provided with a plurality of contact water pipes 6A. In one embodiment, the combustion facility 1 comprises a plurality of contact water pipes 6A. FIG. 4 is a schematic configuration diagram showing the configuration of a plurality of water tubes 6 according to one embodiment, and the opening 13 of the burner throat portion 12 is viewed from inside the furnace 2. As shown in FIG. FIG. 5 is a diagram for explaining the layout of the plurality of water tubes 6 shown in FIG. 4, viewing the plurality of water tubes 6 from the vertical direction D2.

In one embodiment, as illustrated in FIG. 4, the plurality of water tubes 6 are contact water tubes 6A provided to cross the flame X as described above and non-contact water tubes 6B provided not to cross the flame X. (6) and

In the form illustrated in FIG. 4, the plurality of water tubes 6 includes eight contact water tubes 6A. The eight contact water pipes 6A are spaced apart from each other along the circumferential direction D3 of the wall surface 8 of the furnace 2 . A pair of the contact water pipes 6A, which are provided adjacent to each other in the circumferential direction D3 among the eight contact water pipes 6A, are provided in a space in front of the burner 4 at intervals when viewed in the axial direction D1 of the burner 4. ing.

Specifically, the pair of contact water pipes 6A are connected to each other by fins 10 and form part of the wall surface 8 of the furnace 2. As shown in FIG. However, the circular portion B1 facing the opening 13 of the burner throat portion 12 of the portion of the wall surface 8 is not provided with the fins 10 . In the form illustrated in FIG. 4 , the fins 10 are not provided on the rectangular portion B2 surrounding the circular portion B1 of the portion of the wall surface 8 . In this manner, the pair of contact water pipes 6A are provided in the space in front of the burner 4 with a space therebetween when viewed in the axial direction D1 of the burner. In one embodiment, as illustrated in FIG. 5, the eight contact water pipes 6A are spaced apart along the circumferential direction D3 and arranged at the same position in the axial direction D1.

In the form illustrated in FIG. 4, the multiple water tubes 6 include multiple non-contact water tubes 6B. Each of the plurality of non-contact water pipes 6B extends linearly along the vertical direction D2. Each of the plurality of non-contact water tubes 6B does not pass through the rectangular portion B2 of the wall surface 8 of the furnace 2 when viewed in the axial direction D1 of the burner 4. The contact water tube 6A has a larger inner diameter than the non-contact water tube 6B.

(action/effect)
According to one embodiment, the contact water tube 6A is provided in the space in front of the burner 4 so as to traverse the flame X formed by the burner 4, as illustrated in FIG. Therefore, by bringing the flame X into contact with the contact water tube 6A, the flame temperature can be reduced, and the generation of NOx due to the combustion of the gaseous fuel F can be suppressed.

According to one embodiment, since the gas fuel F contains hydrogen, it can be applied to the combustion equipment 1 that burns the gas fuel F containing hydrogen. Furthermore, since the gas fuel F does not contain a carbon component, the generation of carbon monoxide by burning the gas fuel F can be suppressed. In addition, it is possible to prevent soot from adhering to the surface (crossing portion 38) of the contact water pipe 6A.

According to one embodiment, the contact water pipe 6A runs straight through the space in front of the burner 4. Therefore, compared with the case where the contact water pipe 6A that contacts the flame X extends non-linearly in the space in front of the burner 4, the manufacturing of the contact water pipe 6A can be facilitated and the manufacturing cost can be reduced. Moreover, the structure of the plurality of water tubes 6 including the contact water tube 6A can be simplified.

It should be noted that the present disclosure does not limit the contact water tube 6A to extend linearly. That is, the present disclosure does not limit the contact water tube 6A to a straight tube. The contact water pipe 6A may have a curved portion that extends in a curved manner as long as it is provided so as to traverse the flame X. Furthermore, the present disclosure does not limit the non-contact water tube 6B to extend linearly.

The contact water pipe 6A that traverses the flame X obstructs the flow of the primary air A1, the secondary air A2, and the flame X, and may deteriorate the combustibility of the gas fuel F. On the other hand, according to one embodiment, as illustrated in FIG. 4, the pair of contact water pipes 6A are spaced apart from each other along the circumferential direction D3. Therefore, the flame X can be passed between the pair of contact water tubes 6A, and the smooth flow of the primary air A1, the secondary air A2, and the flame X can be achieved. Therefore, deterioration of combustibility of the gas fuel F can be suppressed.

Since the contact water tube 6A is in contact with the flame X, the fluid (water supply or steam) flowing through the contact water tube 6A has a higher temperature than the fluid flowing through the non-contact water tube 6B, and its flow velocity is faster. As a result, deterioration of the contact water pipe 6A may be accelerated. On the other hand, according to one embodiment, by making the inner diameter of the contact water tube 6A larger than the inner diameter of the non-contact water tube 6B, the increase in the flow velocity of the fluid flowing through the contact water tube 6A is suppressed, and the contact water tube 6A deteriorates. can be suppressed.

A conventional water pipe (furnace wall pipe) is bent so as to bypass the circular portion B1 facing the opening 13 of the burner throat portion 12 . However, according to one embodiment, the contact water tube 6A extends straight. Therefore, bending is not necessary, and the manufacturing cost of the furnace 2 can be reduced.

By the way, in one embodiment, the plurality of contact water pipes 6A are arranged so that the positions in the axial direction D1 are the same, but the present disclosure is not limited to this form. FIG. 6 is a diagram showing a layout of multiple water tubes 6 according to some embodiments.

In some embodiments, as illustrated in FIG. 6, a pair of contact water pipes 6A provided adjacent to each other in the circumferential direction D3 have different positions in the axial direction D1 of the burner in the space in front of the burner 4. .

Specifically, in the embodiment illustrated in FIG. 6, the eight contact water pipes 6A are arranged in order from one side in the circumferential direction D3: first contact water pipe 6A1, second contact water pipe 6A2, third contact water pipe 6A3, third contact water pipe 6A3, 4 contact water pipes 6A4, 5th contact water pipes 6A5, 6th contact water pipes 6A6, 7th contact water pipes 6A7 and 8th contact water pipes 6A8.

Each of the first contact water pipe 6A1, the third contact water pipe 6A3, the fifth contact water pipe 6A5, and the seventh contact water pipe 6A7 extends linearly along the vertical direction D2 as described above (see FIG. 3). . That is, each of the first contact water pipe 6A1, the third contact water pipe 6A3, the fifth contact water pipe 6A5, and the seventh contact water pipe 6A7 is a straight pipe. Each cross section 38 of the first contact water pipe 6A1, the third contact water pipe 6A3, the fifth contact water pipe 6A5, and the seventh contact water pipe 6A7 is positioned along the axial direction D1 of the burner 4 in the space in front of the burner 4. is the first position P1.

On the other hand, each of the second contact water tube 6A2, the fourth contact water tube 6A4, the sixth contact water tube 6A6, and the eighth contact water tube 6A8 has a projecting shape that projects toward the internal space 3 of the furnace 2. A cross section 38 of each of the second contact water tube 6A2, the fourth contact water tube 6A4, the sixth contact water tube 6A6, and the eighth contact water tube 6A8 protrudes toward the interior space 3 of the furnace 2, and the cross section 38 is In the space in front of the burner 4, the position along the axial direction D1 of the burner 4 is the second position P2. The second position P2 is a position forward of the first position.

Each structure of 2nd contact water pipe 6A2, 4th contact water pipe 6A4, 6th contact water pipe 6A6, and 8th contact water pipe 6A8 is demonstrated. FIG. 7 is a diagram showing the configuration of the second contact water pipe 6A2 according to some embodiments. Each of the fourth contact water pipe 6A4, the sixth contact water pipe 6A6, and the eighth contact water pipe 6A8 has the same configuration as the second contact water pipe 6A2, so the description thereof is omitted.

In some embodiments, as illustrated in FIG. 7, the second contact water pipe 6A2 includes an upper connection portion 50 that connects the upper end 40 of the crossing portion 38 and the lower end 48 of the upper water pipe portion 42, and a A lower connecting portion 54 that connects the lower end 44 and the upper end 52 of the lower water tube portion 46 is further provided. The upper end 40 of the transverse portion 38 is located forward of the lower end 48 of the upper water tube portion 42 , and the lower end 44 of the transverse portion 38 is located forward of the upper end 52 of the lower water tube portion 46 . That is, the second contact water pipe 6A2 is configured such that the crossing portion 38 is shifted forward. The crossing portion 38 has a second position P2 along the axial direction D1.

Therefore, the crossing portions 38 of the pair of contact water tubes 6A (for example, the first contact water tube 6A1 and the second contact water tube 6A2) are different in position in the axial direction D1 of the burner 4. According to such a configuration, compared to the case where the positions of the pair of contact water tubes 6A in the axial direction D1 are the same, the flame X can pass through the pair of contact water tubes 6A more smoothly, so the gas fuel The deterioration of the combustibility of F can be further suppressed.

By the way, for example, when the crossing portion 38 of the second contact water pipe 6A2 and the crossing portion 38 of the fourth contact water pipe 6A4 are different in position along the axial direction D1, the second contact water pipe 6A2 and the fourth contact water pipe 6A4 It is necessary to prepare two types of contact water pipes 6A corresponding to . Therefore, the manufacturing cost of the furnace 2 may increase significantly.

In some embodiments, as illustrated in FIG. 6, each of the plurality of contact water pipes 6A is configured such that the transverse portion 38 is located at either the first position P1 or the second position P2. . In some embodiments, as illustrated in FIG. 6, the plurality of water tubes 6 are a first pair of contact water tubes 6A consisting of a first contact water tube 6A1 and a second contact water tube 6A2, and a third contact water tube 6A3. a second pair of contact water tubes 6A consisting of a fourth contact water tube 6A4.

In the circumferential direction D3, the third contact water pipe 6A3 is located on the opposite side of the second contact water pipe 6A2 from the first contact water pipe 6A1. As described above, each of the first contact water pipe 6A1 and the third contact water pipe 6A3 is at the first position P1 along the axial direction D1 of the burner 4 . In the circumferential direction D3, the fourth contact water pipe 6A4 is located on the opposite side of the second contact water pipe 6A2 across the third contact water pipe 6A3. As described above, the position along the axial direction D1 of the burner 4 is the second position P2 for each of the second contact water pipe 6A2 and the fourth contact water pipe 6A4.

According to such a configuration, it is only necessary to prepare a linear contact water pipe 6A (so-called straight pipe) corresponding to the first contact water pipe 6A1 and one type of contact water pipe 6A corresponding to the second contact water pipe 6A2. Therefore, an increase in the manufacturing cost of the furnace 2 can be suppressed while further suppressing deterioration of the combustibility of the gas fuel F.

Note that the layout of the plurality of water pipes 6 is not limited to the forms illustrated in FIGS. 5 and 6, respectively. For example, although not shown, the pair of contact water pipes 6A includes one contact water pipe 6A and the other contact water pipe closer to the central axis C of the burner than the one contact water pipe 6A. It is positioned forward of one contact water pipe 6A. In other words, the contact water pipe 6A is provided so as to move away from the opening 13 of the burner throat portion 12 as it approaches the central axis C of the burner.

The contents described in each of the above embodiments are understood as follows, for example.

[1] A combustion facility (1) according to the present disclosure includes a plurality of water pipes (6) that form a wall surface (8) of a furnace (2), and a burner (4) that ejects gas fuel (F) into the furnace. and, at least one of the plurality of water tubes (6A) is provided to traverse the flame (X) formed by the burner.

According to the configuration described in [1] above, since at least one of the plurality of water tubes traverses the flame formed by the burner, the flame temperature is reduced by bringing the flame into contact with the water tube, and the gas fuel is replenished. Generation of NOx due to combustion can be suppressed.

[2] In some embodiments, in the configuration described in [1] above, the gas fuel contains hydrogen.

The configuration described in [2] above can be applied to a combustion facility that burns gas fuel containing hydrogen.

[3] In some embodiments, in the configuration described in [1] or [2] above, the gas fuel does not contain a carbon component.

According to the configuration described in [3] above, since the gas fuel does not contain a carbon component, it is possible to suppress the generation of carbon monoxide by burning the gas fuel. In addition, it is possible to prevent soot from adhering to the surface of the water tube that traverses the flame.

[4] In some embodiments, in the configuration according to any one of [1] to [3] above, at least one of the plurality of water pipes extends linearly in the space in front of the burner. extends to

According to the configuration described in [4] above, compared to the case where the water tube that contacts the flame (contact water tube) extends non-linearly in the space in front of the burner, the contact water tube can be manufactured easily. Cost can be reduced. Also, the structure of the plurality of water tubes including the contact water tube can be simplified.

[5] In some embodiments, in the configuration according to any one of [1] to [4] above, two of the plurality of water tubes (6A1, 6A2) are provided adjacent to each other. The pair of water tubes are spaced apart from each other in the space in front of the burner when viewed in the axial direction of the burner.

If a water tube is provided to traverse the flame, the flow of the flame may be obstructed by the water tube, deteriorating the combustibility of the gas fuel. According to the configuration described in [5] above, the flame can be passed between the pair of water tubes to facilitate the flow of the flame. Therefore, it is possible to suppress the deterioration of the combustibility of the gas fuel.

[6] In some embodiments, in the configuration described in [5] above, the pair of water pipes have different positions in the axial direction of the burner in the space in front of the burner.

According to the configuration described in [6] above, deterioration of the combustibility of the gas fuel can be further suppressed as compared with the case where the axial positions of the burners are the same.

[7] In some embodiments, in the configuration described in [6] above, the plurality of water tubes are a first pair of water tubes (6A1, 6A2) and a second pair of water tubes (6A3, 6A4), wherein the first pair of water pipes is a first water pipe (6A1) whose axial position along the axial direction of the burner is a first position (P1) in the space in front of the burner and a second water pipe (6A2) whose axial position along the axial direction of the burner is a second position (P2) different from the first position in the space in front of the burner, and A second pair of water tubes are arranged such that, in the space in front of the burner, the axial position along the axial direction of the burner is the first position, and the second water tube is interposed between the first water tube and the second water tube. In the space in front of the third water pipe (6A3) located on the opposite side and the burner, the axial position along the axial direction of the burner is the second position, and the third water pipe is sandwiched between the and a fourth water pipe (6A4) positioned opposite to the second water pipe.

According to the configuration described in [7] above, the axial position of the first water pipe and the axial position of the third water pipe are the same first position, and the axial position of the second water pipe and the axial position of the fourth water pipe The directional positions are second positions that are the same as each other. Therefore, the configuration of the first water tube and the third water tube, and the configuration of the second water tube and the fourth water tube can be unified, so that the deterioration of the combustibility of the gas fuel can be further suppressed, and the increase in the manufacturing cost of the furnace can be suppressed. can be suppressed.

1 combustion equipment 2 furnace 4 burner 6 water tube 6A contact water tube (at least one of a plurality of water tubes)
6A1 First contact water pipe (first water pipe)
6A2 Second contact water pipe (second water pipe)
6A3 third contact water pipe (third water pipe)
6A4 4th contact water pipe (4th water pipe)
8 Furnace walls

F Gas fuel P1 First position P2 Second position X Flame

Claims (7)

a plurality of water tubes forming the walls of the furnace;
a burner for ejecting gas fuel into the furnace,
The plurality of water tubes include at least one contact water tube provided to traverse the flame formed by the burner and a non-contact water tube provided not to traverse the flame,
The at least one contact water tube has a larger inner diameter than the non-contact water tube,
the at least one contact water tube includes a protruding tube having a protruding shape that protrudes toward the interior space of the furnace;
The projecting tube is
a crossing portion extending linearly in the vertical direction, at least a portion of which crosses the flame forming region;
an upper water tube portion extending linearly along the vertical direction and arranged in a direction away from the internal space of the furnace in the axial direction of the burner relative to the transverse portion and above the transverse portion; ,
A lower water pipe extending linearly along the vertical direction and arranged in a direction away from the internal space of the furnace in the axial direction of the burner relative to the transverse portion and below the transverse portion. Department and
an upper connection portion that connects the upper end of the crossing portion and the lower end of the upper water tube portion;
a lower connecting portion that connects the lower end of the transverse portion and the upper end of the lower water tube portion;
Combustion equipment. the gas fuel comprises hydrogen;
Combustion equipment according to claim 1 . the gas fuel does not contain a carbon component,
Combustion equipment according to claim 1 or 2. The at least one contact water pipe extends linearly through the space in front of the burner,
Combustion installation according to any one of claims 1 to 3. said at least one contact water pipe comprises a pair of contact water pipes provided adjacent to each other;
The pair of contact water pipes are provided in a space in front of the burner and are spaced apart from each other when viewed in the axial direction of the burner,
Combustion installation according to any one of claims 1 to 4. The pair of contact water pipes are located in different positions in the axial direction of the burner in the space in front of the burner,
Combustion equipment according to claim 5. said at least one contact water tube comprises a first said pair of said contact water tubes and a second said pair of said contact water tubes;
The first pair of contact water tubes are
a first water pipe whose axial position along the axial direction of the burner is a first position in the space in front of the burner;
a second water pipe having an axial position along the axial direction of the burner at a second position different from the first position in a space in front of the burner;
The second pair of contact water tubes are
In the space in front of the burner, the axial position along the axial direction of the burner is the first position, and the third water pipe is located on the opposite side of the first water pipe with the second water pipe interposed therebetween. and,
In the space in front of the burner, the axial position along the axial direction of the burner is the second position, and the fourth water pipe is located on the opposite side of the second water pipe with the third water pipe interposed therebetween. and having
Each of the first water pipe and the third water pipe is a straight pipe extending linearly along the vertical direction,
Each of the second water pipe and the fourth water pipe is the projecting pipe,
Combustion equipment according to claim 6.

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