JP2008075940A - Combustion device and boiler using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion device of high maintainability, easy in uniformly fastening laminated members. <P>SOLUTION: The combustion device comprises a laminated flame holding body 21 formed by laminating a plurality of plate members; a fastening means provided at the center part of the laminated flame holding body 21; a lower support member 22 provided in a lower position of the laminated flame holding body 21; and an upper support member 23 provided in an upper position of the laminated flame holding body 21. The fastening means comprises a shaft part 40 fixed to the lower support member 22, and a fastening part 41 fastened to the shaft part 40 in the upper position of the laminated flame holding body 21. The fastened state of the plurality of plate members provided between the lower support member 22 and the upper support member 23 can be adjusted by controlling the fastened state of the shaft part 40 and fastening part 41. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a combustion apparatus and a boiler configured using the combustion apparatus.

  Conventionally, a boiler having a can having a group of water tubes arranged in an annular shape is well known. In such a boiler, a burner (combustion device) is generally arranged at the center of the water tube group. It is installed. That is, in the boiler having such a configuration, the central portion of the water tube group arranged in an annular shape functions as a combustion chamber for burning the fuel supplied from the combustion device.

  As a combustion apparatus according to the prior art and a boiler using this combustion apparatus, the technique described in Patent Document 1 is known. The combustion device described in Patent Document 1 is configured by laminating a plurality of corrugated plates (waving ring-shaped members) and the like, and the combustion device thus configured is connected to the central portion of the water tube group. A boiler is arranged in the (combustion chamber).

  More specifically, in the combustion apparatus described in Patent Document 1, a plurality of corrugated plates (ring-shaped members that are corrugated) and a flat plate (spacer member) are laminated, and these laminated plate-like members (wave-like members). A plate and a flat plate are tightened with a plurality of bolts (tightening means). In the combustion apparatus configured as described above, an ejection hole is formed between the laminated plate-like members, and the premixed gas is ejected from the ejection hole. When the premixed gas ejected from the ejection hole is ignited, a flame is formed and held in the vicinity of the ejection hole of the combustion apparatus, and the water tube group is heated by the flame. In the boiler described in Patent Document 1, warm water or steam is generated by heating the water tube group with this flame.

JP-A-11-141815

  As described above, in the prior art (see Patent Document 1), a plurality of plate-like members are laminated, and a plurality of bolts are disposed in a state of being penetrated through the laminated plate-like members. By fastening a corresponding nut, a plurality of plate-like members are integrated to constitute a combustion device. That is, the combustion apparatus according to the prior art adjusts the balance of the ejection holes and the like by adjusting the fastening state of the plurality of bolts and nuts. However, in such a configuration, it is difficult to adjust the tightening state of the stacked plate-like members uniformly by adjusting a plurality of nuts and the like in a balanced manner.

  Further, in the above-described prior art, it is difficult to uniformly adjust the tightening state of the laminated plate-like members, so that a lot of work time is required when performing maintenance during cleaning or combustion state adjustment. There was a problem.

  Furthermore, in the prior art, when performing the above-described maintenance process (for example, adjusting the tightening state to adjust the combustion state), the bolt head portion at the lower position of the combustion device (lower position when the boiler is attached) is used. The nut must be adjusted (for example, tightened) at the upper position of the combustion device (upper position when the boiler is mounted) while being fixed with a spanner or the like. Therefore, when performing such adjustment, there is a problem in the prior art that the operation of attaching and detaching the combustion device attached to the boiler must always be performed.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and it is an object to provide a combustion apparatus that can uniformly tighten the laminated member and has high maintainability. And Moreover, this invention makes it a subject to provide the boiler which can improve maintainability etc. by using this combustion apparatus.

  The present invention has been made in order to solve the above-described problems, and includes a laminated flame holder formed by laminating a plurality of plate-like members, and fastening means provided at a central portion of the laminated flame holder. A lower support member provided at a lower position of the laminated flame holder and an upper support member provided at an upper position of the laminated flame holder, and the fastening means is fixed to the lower support member. And a fastening part fastened to the shaft part at a position above the laminated flame holder. That is, the present invention has been made to solve the above-described problem, and is a laminated flame holder formed by laminating a plurality of plate-like members, and a clamp provided at the center of the laminated flame holder. Means, a lower support member provided at a lower position of the laminated flame holder, and an upper support member provided at an upper position of the laminated flame holder, wherein the tightening means is attached to the lower support member. It is comprised using the fixed axial part and the fastening part fastened with the said axial part in the upper position of the said laminated flame stabilizer, and controls the fastening state of the said axial part and the said fastening part. Thus, the tightening state of the plurality of plate-like members provided between the lower support member and the upper support member can be adjusted.

  According to such a configuration, it is possible to adjust the fastening state of the plurality of plate-like members by controlling the fastening state of the fastening portion that constitutes the fastening means provided in the central portion of the laminated flame stabilizer. Therefore, the laminated member (a plurality of plate-like members) can be tightened uniformly more easily. That is, conventionally, nuts and the like at a plurality of locations have to be adjusted. However, according to the present invention, the laminated member can be uniformly tightened by using only one tightening means. Moreover, since it is such a structure, the clamping | tightening state of the laminated plate-shaped member can be adjusted easily and uniformly, and the maintenance at the time of cleaning or combustion state adjustment can be performed in a short time.

  Further, in the combustion apparatus according to the present invention, the laminated flame holder is configured such that an ejection hole is formed so as to eject premixed gas from the central part to the outer peripheral part of the laminated flame holder. preferable.

  Furthermore, in the combustion apparatus according to the present invention, the laminated flame holder is preferably configured by alternately laminating a plurality of corrugated plates and flat plates.

  Moreover, in the combustion apparatus concerning this invention, the structure which can control the fastening state of the said shaft part and the said fastening part in the state with which the boiler was mounted | worn is preferable.

  Furthermore, the present invention has been made to solve the above-described problem, and is a boiler including a can having a water tube group arranged in an annular shape and a combustion device disposed in a central portion of the water tube group. And the said combustion apparatus is a combustion apparatus which has one of the structures mentioned above.

  According to such a configuration, it is possible to obtain a boiler capable of easily adjusting and maintaining the combustion device. That is, according to such a structure, the boiler which can improve maintenance property etc. can be obtained by using one of the combustion apparatuses mentioned above.

  In the boiler according to the present invention, the fastening portion is located outside the combustion chamber of the can body with the combustion device mounted, and the fastening portion is connected to the shaft portion without removing the combustion device. The structure which can control the fastening state with a part is preferable.

  According to this preferable configuration, since the fastening portion of the combustion device is located outside the combustion chamber in the can body, the laminated flame holder even when the combustion device is mounted on the boiler. By controlling the fastening state of the fastening part that constitutes the fastening means provided in the central part, and adjusting the fastening state of the plurality of plate-like members, the laminated member (plural plate-like members) can be more easily Tightening can be performed uniformly. That is, according to such a configuration, maintenance or the like of the combustion device can be easily performed without removing the combustion device from the boiler.

  According to the present invention, it is possible to uniformly tighten the laminated member, and it is possible to obtain a combustion apparatus with high maintainability. Moreover, according to this invention, the boiler which can improve maintenance property etc. can be obtained by using this combustion apparatus.

  Before describing the embodiments of the present invention, terms used in this specification will be described.

  In the present specification, when simply referred to as “gas”, the gas is a concept including at least one of a gas during a combustion reaction and a gas for which the combustion reaction has been completed, and may also be referred to as a combustion gas. In other words, the gas includes both the gas in the combustion reaction and the gas in which the combustion reaction is completed, the gas in the combustion reaction only, or the gas in which the combustion reaction is completed only. It is a concept that includes. Hereinafter, the same concept is used unless otherwise described.

  Further, the exhaust gas means a gas in which the combustion reaction is completed or almost completed. Further, unless otherwise specified, exhaust gas means either or both of the gas that passes through the boiler body and reaches the chimney and the gas that circulates in the body.

  Hereinafter, embodiments of the present invention will be described.

  First, a combustion apparatus according to the first aspect of the present embodiment includes a laminated flame holder formed by laminating a plurality of plate-like members, a fastening means provided at a central portion of the laminated flame holder, A lower support member provided at a lower position of the flame holder and an upper support member provided at an upper position of the laminated flame holder, and a tightening means includes a shaft portion fixed to the lower support member, and a laminated member It is comprised using the fastening part fastened by the axial part in the upper position of a flame holder.

  Further, in the combustion apparatus according to the second aspect of the present embodiment, in the configuration of the first aspect, the laminated flame holder is configured to eject premixed gas from the central part to the outer peripheral part of the laminated flame holder. A jet hole is formed.

  Further, in the combustion apparatus according to the third aspect of the present embodiment, in the configuration of the first aspect or the second aspect, the laminated flame holder is configured by alternately laminating a plurality of corrugated plates and flat plates.

  Moreover, the combustion apparatus concerning the 4th aspect of this embodiment can control the fastening state of a shaft part and a fastening part in the state mounted | worn with the boiler in the structure of a 1st aspect, a 2nd aspect, or a 3rd aspect. It is configured as much as possible.

  Next, the boiler according to the fifth aspect of the present embodiment is a boiler including a can having a water tube group arranged in an annular shape, and a combustion device disposed in a central portion of the water tube group, The apparatus is configured to be any one of the combustion apparatuses according to the first to fourth aspects described above.

  Moreover, the boiler concerning the 6th aspect of this embodiment is the structure of a 5th aspect. WHEREIN: A fastening part is located outside the combustion chamber in a can body in the state which mounted | worn the combustion apparatus, and without removing a combustion apparatus The fastening state between the shaft part and the fastening part is configured to be controllable.

<Example>
Hereinafter, a combustion apparatus (burner) and a boiler according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view of a longitudinal section of a boiler according to an embodiment of the present invention. Moreover, FIG. 2 has shown explanatory drawing of the cross section which follows the II-II line | wire of FIG. 3 and 4 are schematic views of a burner (corresponding to the “combustion device” of the present invention) provided in the boiler according to the present embodiment. Here, FIG. 3 shows an explanatory view of a longitudinal section of the burner according to the present embodiment, and FIG. 4 shows an explanatory view of a transverse section taken along line IV-IV of FIG. Further, FIG. 5 shows a schematic assembly view of the burner according to the present embodiment, and FIG. 6 shows a schematic perspective view of the burner according to the present embodiment.

  As shown in FIGS. 1 and 2, a boiler 1 according to this embodiment includes a can body 10 having a group of water tubes arranged in an annular shape, and a burner 20 disposed in a combustion chamber at the center of these water tube groups. (Corresponding to the “combustion device” of the present invention) and a wind box 80 for supplying combustion air to the burner 20 is provided above the burner 20.

  The can 10 is configured by standing a plurality of water pipe groups (an inner water pipe group 13, an intermediate water pipe group 14, and an outer water pipe group 15) between an upper header 11 and a lower header 12. Each of the water tube groups 13, 14, 15 is arranged in a substantially concentric annular shape, and an outer water tube group 15 is provided at a predetermined interval from the inner water tube group 13, and the inner water tube group 13, the outer water tube group 15, An intermediate water pipe group 14 is provided in an annular gas flow path 19 formed between the two.

  Moreover, in this embodiment, the inner side water pipe group 13 is comprised cyclically | annularly in the state which closely contacted the water pipe, and the inner side opening part 16 is provided in the one part. The inner opening 16 functions to guide the gas generated inside the inner water tube group 13 to the annular gas channel 19. Further, the intermediate water tube group 14 is formed in an annular shape with a substantially uniform predetermined interval between the water tubes. Further, the outer water tube group 15 is formed in an annular shape with substantially equal predetermined intervals between the water tubes, and fin portions 17 connected to each other in order to eliminate a gap between adjacent water tubes. Is provided. A part of the outer water pipe group 15 is provided with an outer opening 18, and the outer opening 18 functions as a discharge part for discharging the gas whose combustion reaction is almost completed to the outside of the can body. That is, after the gas is collected in the outer opening 18, the gas is discharged to the outside of the can body 10 through the exhaust tube 91 provided at the lower position of the can body.

  As described above, FIG. 3 and FIG. 4 show a schematic diagram of a burner (combustion device) provided in the boiler according to this embodiment, FIG. 5 shows a schematic assembly diagram of the burner according to this embodiment, FIG. 6: has shown the schematic perspective view of the burner concerning a present Example. In the following, in addition to FIGS. 1 and 2, the burner (corresponding to the “combustion device” of the present invention) according to the present embodiment will be specifically described with reference to FIGS. 3 to 6.

  As shown in FIG. 3, the burner 20 according to the present embodiment is installed in a partition wall 81 of a wind box (wind box) 80 (see FIG. 1) constituting air supply means provided in the boiler 1. Specifically, the burner flange portion 43 constituting the burner 20 is placed on the partition wall 81 from above, and the burner flange portion 43 is fastened to the partition wall 81 by a fastening means (not shown) such as a bolt, whereby the burner 20. Is installed above the combustion chamber of the can body 10. In the present embodiment, the configuration of a blower or the like for supplying air into the wind box 80 is omitted because it is a well-known technique.

  As shown in FIGS. 3 and 4, the burner 20 according to the present embodiment includes a laminated flame holder 21 formed by laminating a plurality of plate-like members (corrugated plates 24, flat plates 25), and a laminated flame holder. Tightening means provided at the center of the body 21, a lower burner support plate 22 (corresponding to the “lower support member” of the present invention) provided at a lower position of the laminated flame holder 21, and the laminated flame holder 21 The upper burner support plate 23 (corresponding to the “upper support member” of the present invention) provided at the upper position of the lower burner support plate 22 and the tightening means are fixed to the lower burner support plate 22 of the central tightening bolt 40 (the present invention). And a central tightening bolt 40 and a tightening nut 41 (corresponding to the “fastening portion” of the present invention) at a position above the laminated flame holder 21. Lower burner support by controlling the fastening state between the central fastening bolt 40 and the fastening nut 41 22 and the upper burner support plate 23 a plurality of plate-like member provided between the (corrugated plate 24, the flat plate 25) clamping state of being configured to be adjustable.

  Further, the center tightening bolt 40 and the tightening nut 41 are configured to be fastened by a flange tightening portion 43B of a burner flange portion 43 provided at an upper position of the upper burner support plate 23. The lower end of the fastening bolt 40 (the end opposite to the end fastened to the fastening nut 41) is fixed to the lower burner support plate 22 using a welding socket 44 provided on the lower burner support plate 22. . As shown in FIG. 6, the burner flange portion 43 is provided with a flange tightening portion 43 </ b> B and a flange through hole 43 a, and this flange through hole 43 a is premixed gas (“premixed gas” of the present invention). Or a supply path for supplying combustion air into the burner 20.

  Further, the burner flange portion 43 and the upper burner support plate 23 are connected via a register portion 42 that serves as a premixed gas supply path. Further, heat insulating materials 51 and 52 are provided at the lower position of the lower burner support plate 22 and the outer periphery of the register portion 42.

  The laminated flame holder 21 constituting the burner 20 according to the present embodiment is configured by using six unit flame holders 21A as shown in FIG. As shown in FIG. 5, the unit flame holder 21A includes a corrugated plate 24 (corresponding to the “plate member” of the present invention) and a flat plate 25 (corresponding to the “plate member” of the present invention) in which a through hole 21a is formed. And the like, and the pin 27 is inserted through the two through holes 21a of the unit flame holder 21A. Between the corrugated plates 24 and the flat plates 25 that are alternately laminated in this manner, a plurality of premixed gas ejection holes 26 (in the present invention) for ejecting a premixed gas (corresponding to the “premixed gas” of the present invention). Equivalent to “ejection hole”).

  Further, the lower burner support plate 22 provided at the lower position of the laminated flame holder 21 has a pin hole portion 22a through which the pin 27 is inserted and an attachment portion 32 of the frame holder 30 provided between the adjacent unit flame holders 21A. And a holder hole portion 22b through which is inserted. Further, the upper burner support plate 23 provided above the laminated flame holder 21 has a pin hole 23a through which the pin 27 is inserted and an attachment portion 33 of the frame holder 30 provided between the adjacent unit flame holders 21A. Is formed with a holder hole 23b through which is inserted. Here, the frame holder 30 is configured using a partition wall portion 31, attachment portions 32 and 33, and a side surface portion 34.

  As shown in FIG. 5 and the like, the laminated flame holder 21 according to the present embodiment is provided between six unit flame holders 21A into which two pins 27 are inserted and adjacent unit flame holders 21A. The frame holders 30 (six frame holders 30 in total) are configured to be sandwiched between the lower burner support plate 22 and the upper burner support plate 23. At this time, the frame holder 30 is inserted in the holder hole 22b of the lower burner support plate 22 through the mounting portion 32 so that the frame holder 30 is fixed vertically with respect to the lower burner support plate 22. A welding process is performed.

  As described above, since the burner 20 according to the present embodiment has a hexagonal cross section (see FIG. 4 and the like), it has six planar premixed gas (premixed gas) ejection surfaces, The premixed gas ejection surface is provided with a large number of premixed gas ejection holes 26 (corresponding to the “ejection holes” of the present invention) formed by the laminated corrugated plate 24 and flat plate 25. In such a burner 20, the premixed gas G in which the fuel (gas fuel) and the combustion air are mixed in advance is stored in the register section 42 constituting the burner 20 as indicated by arrows in FIGS. 3 and 4. Through the inside, the gas is ejected radially and planarly from the plurality of premixed gas ejection holes 26.

  In the present embodiment, as described above, the premixed gas is ejected from the burner 20 provided close to the inner water tube group 13 substantially horizontally (substantially perpendicular to the inner water tube group 13). By igniting the premixed gas with a pilot burner (not shown), a planar flame F (see FIG. 7 to be described later) that directly contacts the inner water tube group 13 from the premixed gas ejection surface of the burner 20. Will be formed.

  In this embodiment, based on the shape of the can 10 and the configuration of the burner 20, the gas FG flows in the can 10 of the boiler 1 as shown in FIGS. Here, FIG. 7 is a schematic view of the combustion state of the boiler 1 according to the present embodiment, specifically, an explanatory view of a longitudinal section of a gas flow state in the boiler according to the present embodiment. FIG. 8 is an explanatory diagram of a transverse section taken along the line VIII-VIII in FIG. 7, specifically an explanatory diagram of a transverse section of a gas flow state in the boiler according to the present embodiment.

  First, focusing on the gas flow state in the longitudinal cross-sectional direction of the boiler 1, as shown in FIG. 7, the gas FG1 is ejected substantially horizontally while forming the flame F from the burner 20, and the gas during the combustion reaction. FG1 collides with the inner peripheral surface of the inner water tube group 13 substantially perpendicularly. Next, the gas FG 1 that has collided with the inner peripheral surface of the inner water tube group 13 becomes a gas FG 2 that flows axially downward along the inner peripheral surface of the inner water tube group 13. Here, the gas FG1 collides with a region including the unevenness of each water pipe, and then the gas FG2 flows while contacting along the region including the unevenness. Therefore, in the present embodiment, the inner peripheral surface of the inner water tube group 13 including the unevenness in which the water tubes are closely arranged serves as a cooling unit for cooling the gas.

  If attention is paid to the flow state of the gas in the cross-sectional direction of the boiler 1, the gas FG 1 ejected substantially horizontally from the burner 20 is approximately with respect to the inner peripheral surface of the inner water tube group 13 as shown in FIG. After colliding vertically, the gas FG3 flows along the inner peripheral surface, and this gas FG3 flows out to the opening 16 of the inner water tube group 13. The gas flowing into the annular gas flow path 19 through the opening 16 mainly flows between the inner water tube group 13 and the intermediate water tube group 14 as the gas FG4, and as the gas FG5, the intermediate water tube group 14 and the outer water tube group 15 as the gas FG5. Then, it is discharged to the outside of the can body 10 through the outer opening 18 and the exhaust pipe 91.

  Now, the burner 20 and the boiler 1 concerning a present Example are comprised as mentioned above, and have the following effects based on the structure. Hereinafter, the function and effect will be described in detail with reference to FIGS.

  As described above, the burner 20 according to the present embodiment has a laminated flame holder 21 formed by laminating a plurality of plate-like members (corrugated plates 24, flat plates 25), and a central portion of the laminated flame holder 21. A fastening means provided; a lower burner support plate 22 provided at a lower position of the laminated flame holder 21; and an upper burner support plate 23 provided at an upper position of the laminated flame holder 21; The means comprises a central fastening bolt 40 fixed to the lower burner support plate 22 and a central fastening bolt 40 and a fastening nut 41 at a position above the laminated flame holder 21. By controlling the fastening state of the attachment bolt 40 and the fastening nut 41, the plurality of plate-like members (the corrugated plate 24 and the flat plate 25) provided between the lower burner support plate 22 and the upper burner support plate 23 are controlled. The tightening state is configured to be adjustable.

  That is, the burner 20 according to the present embodiment is laminated by controlling the fastening state of the central fastening bolt 40 and the fastening nut 41 constituting the fastening means provided at the central portion of the laminated flame holder 21. Since the tightening state of the plate-like members (corrugated plate 24, flat plate 25) can be adjusted, the laminated member (laminated flame holder 21 composed of a plurality of plate-like members) can be more uniformly tightened more easily. . That is, conventionally, nuts and the like at a plurality of locations had to be adjusted. According to the present embodiment, only one tightening means (the central tightening bolt 40 and the tightening nut 41) is controlled. By doing so, the laminated flame holder 21 can be clamped uniformly. Moreover, since it is such a structure and the tightening state of the laminated flame holder 21 can be easily and uniformly adjusted, maintenance during cleaning or combustion state adjustment can be performed in a short time.

  Moreover, in the burner 20 according to the present embodiment, a premixed gas jetting is performed on the laminated flame holder 21 so that a premixed gas (premixed gas) is jetted from the central portion of the laminated flame holder 21 to the outer peripheral portion. A hole 26 is formed. Furthermore, in the burner 20 according to the present embodiment, the laminated flame holder 21 is configured by alternately laminating a plurality of corrugated plates 24 and flat plates 25, and between these corrugated plates 24 and flat plates 25. A premixed gas ejection hole is formed in the upper part.

  That is, according to the present embodiment, the laminated flame holder 21 having a large number of premixed gas ejection holes 26 is configured based on a relatively simple configuration using the corrugated plate 24 and the flat plate 25. It is possible to easily obtain the burner 20 that can perform maintenance in a short time during cleaning or combustion state adjustment by performing uniform tightening or the like.

  Further, the burner 20 according to the present embodiment is configured to be able to control the fastening state between the central fastening bolt 40 and the fastening nut 41 while being attached to the boiler 1. More specifically, as shown in FIGS. 3 and 6, the center fastening bolt 40 and the fastening nut 41 are provided on the upper surface side of the flange fastening portion 43 </ b> B provided on the burner flange portion 43 (can body 10. The inner side (combustion chamber side), not the outer side (wind box 80 side)).

  That is, according to the present embodiment, since the central tightening bolt 40 and the tightening nut 41 are fastened on the outside of the can body 10 as described above, the burner 20 can be removed from the can body 10 as necessary. Without removing, the tightening nut 41 can be tightened and the premixed gas ejection holes 26 of the laminated flame holder 21 constituting the burner 20 can be easily adjusted.

  Furthermore, in the burner 20 according to the present embodiment, a frame holder 30 is provided between adjacent unit flame holders 21 </ b> A constituting the laminated flame holder 21. According to such a configuration, it is possible to prevent a gap that may occur between the adjacent unit flame holders 21 </ b> A, and to prevent leakage of the premixed gas. Further, by providing this frame holder 30, the premixed gas ejection surface of the laminated flame holder 21 is more clearly divided, and the flameholding property on each premixed gas ejection surface is enhanced. Furthermore, by providing this frame holder 30, it becomes possible to reduce the influence of the adjacent premixed gas ejection surfaces, and the combustion adjustment on each premixed gas ejection surface can be performed relatively easily.

  Moreover, since the boiler 1 concerning a present Example is comprised using the burner 20 which has the various effect mentioned above, the boiler 1 which can perform adjustment, maintenance, etc. of the burner 20 easily can be obtained. .

  Furthermore, according to such a boiler 1, since the clamping nut 41 which comprises the burner 20 is located outside the combustion chamber in the can body 10, even when the burner 20 is mounted on the boiler 1, the lamination is performed. By controlling the tightening state of the tightening nut 41 constituting the tightening means provided at the center of the flame holder 21 and adjusting the tightening state of the plurality of plate-like members (the corrugated plate 24 and the flat plate 25), The laminated members (the plurality of plate-like members 24 and 25) can be more uniformly tightened more easily. That is, according to such a configuration, it is possible to easily perform maintenance of the burner 20 and thus the boiler 1 without removing the burner 20 from the boiler 1.

  The present invention is not limited to the above-described embodiments and examples, and various modifications can be made as necessary within a range that can be adapted to the spirit of the present invention. Both are included in the technical scope of the present invention.

  In the said Example, although the case where it was the lamination | stacking flame holding body 21 which used the six unit flame holding bodies 21A and has a 6-side premixed gas ejection surface was demonstrated, this invention is not limited to this structure. Therefore, if it is the structure which has one fastening means in the center part, the laminated flame holder 21 which has the premixed gas ejection surface of five or less sides (section pentagon or less) or seven or more sides (section heptagon or more) It is good also as the burner 20 which has.

  Moreover, in the said Example, although the case where the laminated flame holder 21 was comprised using the several unit flame holder 21A was demonstrated, this invention is not limited to this structure. Therefore, as long as the structure has one fastening means at the center, a laminated flame holder may be formed by laminating ring-shaped plate members (corrugated plates and flat plates).

  Furthermore, in the said Example, although the case where the corrugated sheet 24 and the flat plate 25 were laminated | stacked alternately and the unit flame holder 21A and the laminated flame holder 21 were comprised was demonstrated, this invention is not limited to this structure. Therefore, for example, if the angle at the time of lamination is appropriately changed, the corrugated sheets may be laminated to form the unit flame holder and the laminated flame holder. Moreover, you may use an uneven | corrugated plate instead of a corrugated sheet.

  Moreover, in the said Example, although the structure which provides the frame holder 30 in the vertical direction of the outer side of the laminated flame holder 21 was demonstrated, this invention is not limited to this structure. Therefore, for example, the frame holder may be provided in the longitudinal direction inside the laminated flame holder 21. Of course, a vertical frame holder may be provided on both the outside and the inside of the laminated flame holder 21. Furthermore, a plurality of lateral frame holders may be provided on at least one of the inner side and the outer side of the laminated flame holder 21 as necessary. At this time, the horizontal frame holders may be provided at uniform intervals or at different intervals depending on the flame holding condition of the flame.

  Furthermore, in the said Example, although the case where the boiler 1 was comprised using the can which arrange | positioned three rows of water pipe groups in substantially concentric form was demonstrated, this invention is not limited to this structure, As needed In addition, a can body may be configured by arranging two or four or more rows of water tube groups.

It is explanatory drawing of the longitudinal cross-section of the boiler concerning the Example of this invention. It is explanatory drawing of the cross section which follows the II-II line | wire of FIG. It is explanatory drawing of the longitudinal cross-section of the burner provided in the boiler concerning a present Example. It is explanatory drawing of the cross section which follows the IV-IV line | wire of FIG. BRIEF DESCRIPTION OF THE DRAWINGS The schematic assembly drawing of the burner concerning a present Example is shown. The schematic perspective view of the burner concerning a present Example is shown. It is the schematic of the combustion state of the boiler concerning a present Example, Specifically, it is explanatory drawing of the longitudinal cross-section of the flow state of the gas in the boiler concerning a present Example. It is explanatory drawing of the cross section which follows the VIII-VIII line of FIG. 7, Comprising: Specifically, it is explanatory drawing of the cross section of the flow state of the gas in the boiler concerning a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Boiler 10 ... Can body 11 ... Upper header 12 ... Lower header 13 ... Inner water pipe group 14 ... Intermediate water pipe group 15 ... Outer water pipe group 16 ... Inner opening part 17 ... Fin part 18 ... Outer opening part 19 ... Annular gas flow path DESCRIPTION OF SYMBOLS 20 ... Burner 21 ... Laminated flame holder 21A ... Unit flame holder 21a ... Through-hole 22 ... Lower burner support plate 23 ... Upper burner support plate 24 ... Corrugated plate 25 ... Flat plate 27 ... Pin 30 ... Frame holder 31 ... Partition part 32 33 ... Mounting part 34 ... Side part 40 ... Center fastening bolt 41 ... Clamping nut 42 ... Register part 43 ... Burner flange part 43B ... Flange fastening part 43a ... Flange through hole 44 ... Welding socket 51, 52 ... Heat insulation material 80 ... Wind box 81 ... Bulkhead 91 ... Exhaust tube

Claims (6)

A laminated flame holder formed by laminating a plurality of plate-like members, a tightening means provided at a central portion of the laminated flame holder, and a lower support member provided at a position below the laminated flame holder And an upper support member provided at an upper position of the laminated flame holder,
The tightening means includes a shaft portion fixed to the lower support member and a fastening portion fastened to the shaft portion at an upper position of the laminated flame holder. Combustion device. 2. The combustion apparatus according to claim 1, wherein an ejection hole is formed in the laminated flame holder so that premixed gas is ejected from a central portion of the laminated flame holder to an outer peripheral portion. The combustion apparatus according to claim 1 or 2, wherein the laminated flame holder is configured by alternately laminating a plurality of corrugated plates and flat plates. The combustion apparatus according to any one of claims 1 to 3, wherein a fastening state between the shaft portion and the fastening portion can be controlled in a state of being mounted on a boiler. A boiler comprising a can having a water tube group arranged in an annular shape, and a combustion device disposed in a central portion of the water tube group,
The said combustion apparatus is a combustion apparatus of any one of Claim 1 to 4, The boiler characterized by the above-mentioned. With the combustion device mounted, the fastening portion is located outside the combustion chamber in the can body, and the fastening state between the shaft portion and the fastening portion can be controlled without removing the combustion device. The boiler according to claim 5.

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