JP3891075B2 - Two-stage combustion device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  In the present invention, the rich fuel mixture is burned on the flame hole surface in the first stage, and the secondary air is blown out in the second stage to completely burn the combustion gas containing a large amount of unburned components generated by this combustion. In particular, the present invention relates to a technique for improving the durability by promoting cooling of the constituent members by using the supply air for the secondary air.
[0002]
[Prior art]
  Conventionally, a Bunsen burner is less likely to generate combustion vibration (combustion noise) and can achieve a high TDR (Turn Down Ratio), but is said to have a large amount of NOx emissions. In order to reduce NOx, for example, as shown in FIG. 15, the secondary air is blown out to the outer flame Bo of the Bunsen flame B to reduce the temperature of the outer flame while completely combusting the unburned components, thereby reducing NOx. It is also considered to plan. An example of such a combustion apparatus that blows out secondary air is proposed in Japanese Patent Publication No. 4-32287. In this device, secondary air is blown out in parallel to the flame flame formed on the flame hole surface.
[0003]
  Another example is proposed in JP-A-10-169910. In this case, an obstacle is installed in the center of the combustion space in order to promote mixing of the combustion gas and secondary air generated from the flame flame for the boiler furnace, and the obstacle causes the combustion gas and the secondary air to be mixed. A vortex is generated in both air to make it turbulent.
[0004]
[Problems to be solved by the invention]
  However, in the combustion apparatus proposed in the above Japanese Patent Publication No. 4-32287, there is an inconvenience that when the secondary air comes into direct contact with the flame-hole flame, there is an inconvenience that the generation of NOx is increased. Mixing with secondary air cannot be promoted. On the other hand, in the combustion apparatus proposed in Japanese Patent Laid-Open No. 10-169910, significant combustion noise is generated due to the positive formation of eddy currents. Although this is not a problem with a boiler furnace, such a technique cannot be applied to a combustion apparatus such as a water heater that should suppress combustion noise as much as possible.
[0005]
  Therefore, it is conceivable that the air blowing part that blows out the secondary air protrudes beyond the flame hole flame from the flame hole surface, and the combustion gas generated from the flame hole flame is guided to the air blowing part. There may be a situation in which the constituent members of the ejection part are easily exposed to high temperatures and the durability is concerned.
[0006]
  The present invention has been made in view of such circumstances, and the object of the present invention is to promote the cooling of components in order to promote mixing with secondary air while suppressing turbulence as much as possible. Accordingly, it is an object of the present invention to provide a two-stage combustion apparatus capable of maintaining and improving durability.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, there is provided a flame hole surface for burning a rich fuel gas having an air concentration lower than the theoretical combustion air amount and a high fuel concentration toward the combustion space, and an air inside. The flow of combustion gas generated from the flame flame formed on the flame hole surface is disposed in contact with an air blowing portion for blowing secondary air from a tip portion that is supplied and protrudes downstream of the combustion space. Is guided to the tip of the air jetting part so as to receive secondary air blowing. And the said air ejection part is made into a double wall structure with the exterior container which has the jet nozzle which blows off secondary air to a front-end | tip part, and the interior container accommodated in this exterior container, The inner wall surface of this exterior container Forming a supply passage for supplying secondary air to the outlet through a gap between the inner wall and the outer wall of the interior container;did. In addition, a configuration is provided in which the interior container is provided with a communication hole that allows the inside and outside of the container to communicate with each other, and the air supplied into the interior container is supplied to the supply passage through the communication hole.
[0008]
  The “rich fuel gas whose air concentration is lower than the theoretical combustion air amount and whose fuel concentration is high” means that the excess air ratio is less than 1.0 and is larger than the theoretical combustion air amount necessary for complete combustion. In addition to a rich fuel mixture containing an insufficient amount of air, the fuel gas itself containing no air is also included (the same applies to the following claims).
[0009]
  In the case of the present invention, since the rich fuel gas is burned on the flame surface, the flame flame generates a combustion gas containing a large amount of unburned components, and this combustion gas is guided to the tip of the air ejection part. The unburned components in the combustion gas are completely burned by the secondary air blown out from the jet port formed at the tip. At this time, the outer container constituting the air ejection part receives heat from the flame flame and the combustion gas and is heated to a high temperature. On the other hand, the air supplied for the secondary air to the air jetting part passes through the supply passage formed by the gap, and is then blown out from the jet outlet at the tip part into the combustion space. While new air (new air) sequentially supplied to the supply passage passes, the new air contacts the inner wall surface of the outer container and cools the outer container by heat exchange. Here, even in the case where the air ejection portion is constituted by only the outer container instead of the double wall structure, the inner wall surface of the outer container is cooled by receiving the supply of fresh air, but the air for the secondary air Since the supply flow rate of air fluctuates depending on the combustion state, the air supply flow rate also decreases and an effective cooling function cannot be obtained when the combustion amount becomes low. On the other hand, in the case of the present invention, since the air supply passage is formed by a gap between the outer container and the inner container with a double wall structure, the flow velocity of the passing air is increased, Even when the supply amount is decreased, the inner wall surface of the outer container is effectively cooled by the increased passing air, thereby promoting the cooling. In addition, durability is improved by promoting cooling.Become. In particular, in the case of the present invention, since air is once supplied into the interior container and then supplied to the supply passage which is the outer gap through the communication hole, from the beginning without passing through the interior container. The fresh air having a lower temperature than that in the case where it comes into contact with the inner wall surface of the outer container supplied to the supply passage and heated to a high temperature is supplied to the supply passage. For this reason, further cooling of the exterior container is promoted. Further, in this case, the most preferable cooling promotion is achieved if the opening position of the communication hole is set facing the inner wall surface of the part where the outer container is heated to a particularly high temperature in relation to the flame hole flame of the flame hole surface.
[0010]
  In the invention according to claim 2, a flame hole surface for burning the rich fuel gas whose air concentration is lower than the theoretical combustion air amount and whose fuel concentration is high toward the combustion space, and air is supplied to the inside, and downstream of the combustion space. The tip of the air ejection part is arranged in contact with an air ejection part for blowing out secondary air from the tip part protruding to the side, and the flow of the combustion gas generated from the flame flame formed on the flame hole surface is The secondary air is received by being guided by the And the said air ejection part is made into a double wall structure with the exterior container which has the jet nozzle which blows off secondary air to a front-end | tip part, and the interior container accommodated in this exterior container, The inner wall surface of this exterior container A supply passage for supplying secondary air to the outlet is formed by a gap between the inner wall and the outer wall surface of the interior container. in addition,A structure in which a heat transfer member is interposed in the gap between the outer container and the inner container and heat is transferred from the outer container to the inner container via the heat transfer member is added.. In the case of the present invention, since the rich fuel gas is burned on the flame surface, the flame flame generates a combustion gas containing a large amount of unburned components, and this combustion gas is guided to the tip of the air ejection part. The unburned components in the combustion gas are completely burned by the secondary air blown out from the jet port formed at the tip. At this time, the outer container constituting the air ejection part receives heat from the flame flame and the combustion gas and is heated to a high temperature. On the other hand, the air supplied for the secondary air to the air jetting part passes through the supply passage formed by the gap, and is then blown out from the jet outlet at the tip part into the combustion space. While new air (new air) sequentially supplied to the supply passage passes, the new air contacts the inner wall surface of the outer container and cools the outer container by heat exchange. Here, even in the case where the air ejection portion is constituted by only the outer container instead of the double wall structure, the inner wall surface of the outer container is cooled by receiving the supply of fresh air, but the air for the secondary air Since the supply flow rate of air fluctuates depending on the combustion state, the air supply flow rate also decreases and an effective cooling function cannot be obtained when the combustion amount becomes low. On the other hand, in the case of the present invention, since the air supply passage is formed by a gap between the outer container and the inner container with a double wall structure, the flow velocity of the passing air is increased, Even when the supply amount is decreased, the inner wall surface of the outer container is effectively cooled by the increased passing air, thereby promoting the cooling. In addition, durability is improved by promoting cooling. In particular, the present inventionIn this case, further cooling of the outer container can be promoted by heat transfer to the inner container via the heat transfer member.
[0011]
  In the invention according to claim 3, a flame hole surface for burning the rich fuel gas whose air concentration is lower than the theoretical combustion air amount and whose fuel concentration is high toward the combustion space, and air is supplied to the inside, and downstream of the combustion space. The tip of the air ejection part is arranged in contact with an air ejection part for blowing out secondary air from the tip part protruding to the side, and the flow of the combustion gas generated from the flame flame formed on the flame hole surface is The secondary air is received by being guided by the And the said air ejection part is made into a double wall structure with the exterior container which has the jet nozzle which blows off secondary air to a front-end | tip part, and the interior container accommodated in this exterior container, The inner wall surface of this exterior container In the gap between the outer wall of the interior container A supply passage for supplying air for secondary air to the jet outlet is formed. in addition,Either one of the inner wall surface of the outer container and the outer wall surface of the inner container is partially formed with one or two or more protrusions that protrude toward the gap between the two and contact the other.. In the case of the present invention, since the rich fuel gas is burned on the flame surface, the flame flame generates a combustion gas containing a large amount of unburned components, and this combustion gas is guided to the tip of the air ejection part. The unburned components in the combustion gas are completely burned by the secondary air blown out from the jet port formed at the tip. At this time, the outer container constituting the air ejection part receives heat from the flame flame and the combustion gas and is heated to a high temperature. On the other hand, the air supplied for the secondary air to the air jetting part passes through the supply passage formed by the gap, and is then blown out from the jet outlet at the tip part into the combustion space. While new air (new air) sequentially supplied to the supply passage passes, the new air contacts the inner wall surface of the outer container and cools the outer container by heat exchange. Here, even in the case where the air ejection portion is constituted by only the outer container instead of the double wall structure, the inner wall surface of the outer container is cooled by receiving the supply of fresh air, but the air for the secondary air Since the supply flow rate of air fluctuates depending on the combustion state, the air supply flow rate also decreases and an effective cooling function cannot be obtained when the combustion amount becomes low. On the other hand, in the case of the present invention, since the air supply passage is formed by a gap between the outer container and the inner container with a double wall structure, the flow velocity of the passing air is increased, Even when the supply amount is decreased, the inner wall surface of the outer container is effectively cooled by the increased passing air, thereby promoting the cooling. In addition, durability is improved by promoting cooling. In particular, the present inventionIn this case, heat can be transferred from the outer container to the inner container through the convex portion, and further cooling of the outer container can be promoted by this heat transfer. Further, it may be possible to position the inner container with respect to the outer container by providing a plurality of the convex parts, and further, for example, by arranging a large number of convex parts with a uniform distribution in a staggered arrangement, The heat transfer to the inner container is made uniform, and the flow of air passing through the supply passage constituted by the gap is made uniform, so that the outer container is uniformly cooled.
[0012]
  (Delete)
[0013]
  Reference invention 1 not included in claimsThen, a flame hole surface for burning the rich fuel gas having a lower air concentration than the theoretical combustion air amount and a higher fuel concentration toward the combustion space, and a tip portion that is supplied with air and protrudes to the downstream side of the combustion space An air blow-out part that blows out secondary air from the flame hole surface is disposed adjacent to the combustion space side of the flame hole surface so as to cover the flame hole flame from the flame hole surface and generated from the flame hole flame. An induction wall is provided that guides the flow of combustion gas to the tip side of the air ejection part. An air passage extending from the outer wall surface of the partition wall defining the combustion space to the inside of the guide wall is disposed, and the supplied air is supplied to the inner wall surface of the inner edge of the guide wall as the air passage. It was set as the structure which blows off from the exit to the said combustion space after guiding.
[0014]
  thisReference invention 1In this case, the combustion gas generated from the flame flame on the flame surface is guided to the tip of the air ejection part by the guide wall, and the unburned components in the combustion gas are completely exhausted by the secondary air blown out from the tip part. Burned. At that time, the induction wall faces the flame hole flame so that the flame is suppressed by the induction wall, and the direct contact between the secondary air from the air blowing part and the flame flame is suppressed. Thus, the secondary air will be blown directly against the combustion gases, not against the flame flame. As a result, NOx increase due to direct contact between the secondary air and the flame-hole flame is avoided to reduce NOx, and the combustion gas is induced by the induction wall without causing turbulent flow of the combustion gas. May be mixed with secondary air. In addition, the induction wall and the partition wall that are heated to a high temperature opposite to the flame flame are cooled by the air flowing into the air passage. At this time, since the air in the air passage is guided to the inner wall surface of the inner edge of the guide wall, the air is reliably cooled to the inner edge of the guide wall, and the durability can be maintained and improved reliably. And it will be effectively utilized as secondary air which is blown into the combustion space from the outlet and burns unburned components in the combustion gas.
[0015]
  Reference invention 2 not included in claimsThen, a flame hole surface for burning the rich fuel gas having a lower air concentration than the theoretical combustion air amount and a higher fuel concentration toward the combustion space, and a tip portion that is supplied with air and protrudes to the downstream side of the combustion space An air blow-out part that blows out secondary air from the flame hole surface is disposed adjacent to the combustion space side of the flame hole surface so as to cover the flame hole flame from the flame hole surface and generated from the flame hole flame. An induction wall is provided that guides the flow of combustion gas to the tip side of the air ejection part. An air passage extending from the outer wall surface of the partition wall defining the combustion space to the flame hole surface side through the inside of the guide wall is disposed, and the supplied air is guided as the air passage. After guiding up to the inner wall surface of the inner edge of the wall, the structure is supplied to the flame hole surface side as primary air for combustion at the flame hole surface.
[0016]
  thisReference invention 2In this case, the induction wall suppresses the expansion of the flame flame and avoids the increase of NOx caused by the direct contact between the secondary air and the flame flame, thereby reducing the NOx, and the combustion gas Is obtained in the same manner as the invention according to claim 5 in that the air is mixed with the secondary air without being guided to the tip of the air ejection portion to be turbulent. In addition, the induction wall or the partition wall heated to a high temperature opposite to the flame flame is cooled by the air flowing into the air passage, and at that time, the air in the air passage becomes the inner end of the induction wall. Since it is guided to the inner wall surface of the edge, it is reliably cooled to the inner edge of the guide wall, and the durability can be reliably maintained and improved. Then, the air after cooling the partition wall and the induction wall is effectively used as the primary air for combustion on the flame hole surface.
[0017]
【The invention's effect】
  As described above, claims 1 to claim3According to any one of the two-stage combustion apparatuses, since the air supply passage for the secondary air is constituted by a gap between the outer container and the inner container, the flame or flame from the flame surface or combustion The flow velocity of the air that comes into contact with the inner wall surface of the outer container exposed to high temperature by the gas can be increased compared to the case of only the outer container without the inner container, and the increased air constitutes the air ejection part. It is possible to promote the cooling of the outer container. Thereby, the maintenance improvement of durability of an air ejection part can be implement | achieved reliably.
[0018]
  In particular, according to claim 2, it is possible to further promote cooling of the outer container by heat transfer from the outer container to the inner container through the heat transfer member. The cooling of the outer container can be further promoted by heat transfer to the inner container via the convex part, and1According to this, cooling of the outer container can be promoted more effectively by supplying the air supplied into the inner container to the supply passage through the communication hole.
[0019]
  (Delete)
[0020]
  (Delete)
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
<First Embodiment>
  FIG. 1 shows a two-stage combustion apparatus according to a first embodiment of the present invention. This two-stage combustion apparatus is provided with an air ejection portion 3 projecting a predetermined amount on the downstream side of the combustion space 2 (upper side in FIG. 1) at the center position, and 1 or 2 at the side position of the air ejection portion 3. A flame hole surface 4 constituted by the respective tip flame holes of the combustion pipes 41, 41,. The above-mentioned “center position” and “side position” mean that if the two-stage combustion apparatus is a cylindrical type, the air ejection section 3 is disposed at the center position and surrounds the flame hole surface at the outer peripheral position. 4 is disposed, and if the two-stage combustion apparatus is a rectangular tube having a rectangular shape in plan view, the air ejection portion 3 is disposed at the center in the width direction, and flames are disposed at both outer positions with the air ejection portion 3 interposed therebetween. That is, the hole surface 4 is disposed.
[0023]
  The combustion space 2 is defined by a partition wall 21 of the apparatus body and extends from the flame hole surface 4 to the downstream side (upper side in FIG. 1). A heating target (not shown) is arranged on the downstream end side. Established. For example, in the case of a water heater, a heat exchanger for heat exchange heating of water passing through the inside is disposed as a heating target.
[0024]
  A guide wall 22 projecting from the partition wall 21 toward the center side is provided at a position near the downstream side of the air ejection portion 3, and a constricted portion 23 is formed in the combustion space 2 by an inner end edge 221 of the guide wall 22. Is formed. The guide wall 22 is disposed so as to face the flame hole surface 4 at a position downstream of the flame hole surface 4, while the air ejection part 3 is disposed so as to face the opening position of the narrowed part 23. .
[0025]
  The air ejection part 3 includes an outer container 31, an inner container 32, and an air supply passage 33 formed by a gap between the two parts 31, 32, and the distal end 311 of the outer container 31 is the flame. It is arrange | positioned so that it may protrude in the downstream of the combustion space 2 rather than the flame hole flames 42, 42, ... from the hole surface 4. The supply passage 33 is defined by an inner wall surface 312 of the outer container 31 and an outer wall surface 321 of the inner container 32, and air from an air supply source (not shown) flows into the upstream inflow port 331. It is supposed to be.
[0026]
  A plurality of jets 34, 34,... Face the narrowed part 23 and open toward the downstream side of the combustion space 2 at the tip 311 of the outer container 31, and each jet 34 is supplied to the supply passage 33. Is blown out as secondary air to the combustion space 2. On the other hand, the interior container 32 communicates with the inlet 322 into which air from the air supply source flows into the base end wall, and the interior of the interior container 33 and the external supply passage 33 through the side wall and the top wall, respectively. A plurality of communication holes 323, 323,. In particular, the communication holes 323, 323,... Formed in the side wall are preferably formed at positions facing the portion where the outer container 31 is heated to a particularly high temperature (for example, a portion adjacent to the flame hole flame 42).
[0027]
  The flow path area ratio between the inlet 322 of the interior container 32 and the inlet 331 of the supply passage 33 is such that the supply air from the air supply source has a larger flow rate than the inlet 331 from the interior of the inlet 322. It is set to flow into the container 32. Thus, a main amount of air from the air supply source once flows into the interior container 32 through the inflow port 322 and then blown into the supply passage 33 through the communication holes 323 on the side wall side. The remaining relatively small amount of air flows from 331.
[0028]
  Each combustion pipe 41 constituting the flame hole surface 4 is supplied with a rich fuel mixture having a high fuel concentration and an excess air ratio of less than 1.0 (100%). A flame hole flame 42, 42,... That is an incomplete combustion flame is formed on the hole surface 4 by the primary combustion of the rich fuel mixture. At this time, the primary air is supplied from the primary air supply pipes 43, 43,. A combustion gas containing a large amount of unburned components generated from the flame hole flame 42 is guided to the guide wall 22 and flows between the narrowed portion 23 and the tip portion 311 of the air jetting portion 3. On the other hand, secondary air is blown out from each jet port 34 of the air jet part 3, and the unburned component in combustion gas is burned completely (secondary combustion).
[0029]
  In addition, instead of the rich fuel mixture, the fuel gas itself without premixing air may be supplied to the combustion pipes 41 to cause primary combustion. Also in this case, the two-stage combustion in the present embodiment can be applied only by increasing the unburned components in the combustion gas. The rich fuel gas (the rich fuel mixture or the fuel gas itself) supplied for primary combustion on the flame surface 4 described above is the same in the following embodiments.
[0030]
  In the case of the above-described two-stage combustion apparatus of the first embodiment, since the guide wall 22 covers the front of the flame hole surface 4, the expansion of the flame hole flames 42, 42,. As a result, only the combustion gas can be induced, and the secondary air from the air blowing portion 3 can be blown out only to the combustion gas. That is, the guide wall 22 is generated from the function of separating and blocking the direct contact between the secondary air from the air jetting part 3 and the flame hole flames 42, 42,... And the flame hole flames 42, 42,. The function of inducing the flow of the combustion gas to intersect with the secondary air blown out from the air blowing portion 3 is exhibited. By the separation / interruption function, it is possible to avoid NOx increase caused by direct contact of the secondary air with the flame-hole flames 42, 42,... Mixing of the combustion gas and the secondary air can be promoted by penetrating and supplying the secondary air to the inside of the combustion gas while suppressing the turbulence of the gas. While suppressing the generation of combustion noise as much as possible by suppressing the turbulence, unburned components can be completely combusted by promoting mixing. Further, the contact with the secondary air can reduce the combustion gas temperature and contribute to the reduction of NOx.
[0031]
  In addition, since secondary air passes through the opening of the constricted portion 23 and is blown out toward the downstream side of the combustion space 2, the combustion gas is blown out to the downstream side of the combustion space 2 by the secondary air. The secondary combustion of the unburned components in the combustion gas can be directed downstream of the combustion space 2 toward the downstream side of the combustion space 2 without greatly disturbing the flow of the combustion gas.
[0032]
  In addition, it is possible to promote the cooling of the air ejection part 3 that is exposed to the flame flames 42, 42,... Maintenance can be improved. That is, since the air supplied to each of the ejection holes 34 passes through the supply passage 33 having a relatively narrow flow path, the air flow from the air supply source is accelerated in the supply passage 33, and this speed increase The air flow thus brought into contact with the inner wall surface 312 of the outer container 31 can cool the inner wall surface 312 effectively.
[0033]
  Moreover, since the main amount of air supplied to the supply passage 33 once flows into the interior container 32 and is blown through the communication holes 323, it is maintained at a lower temperature than the air flowing in from the inlet 331 from the beginning. The air in the interior container 31 can increase the cooling function of the inner wall surface 312 of the exterior container 31. Furthermore, by disposing each communication hole 323 facing a portion of the outer container 31 that is heated to a particularly high temperature, it is possible to further increase the cooling function and promote cooling.
[0034]
Second Embodiment
  FIG. 2 shows a main part of the two-stage combustion apparatus of the second embodiment. In the two-stage combustion apparatus of the second embodiment, the partition wall and the guide wall that divide the combustion space 2 are the same as those described in the first embodiment. It mainly illustrates an air ejection portion 3a that employs a configuration different from that of the first embodiment. 3, 5, and 7 described in the following embodiments are the same as those in the first embodiment as described above, and therefore the illustration of the partition wall and the guide wall is omitted.
[0035]
  The air ejection part 3a includes an outer container 31 having an outlet 34, 34,... At the tip part 311; an inner container 32a; and a gap between the inner wall surface 312 of the outer container 31 and the outer wall surface 321 of the inner container 32. Although it is the same as that of the air ejection part 3 of 1st Embodiment in the point provided with the air supply path | route 33a comprised by this, it differs in the point by which the interior container 32 is not connected with the supply path | route 33a.
[0036]
  That is, the interior container 32a serves to exclude a part of the internal space of the exterior container 31 in order to form the supply passage 33a with a relatively narrow inner width. A perforated plate 35 having a large number of through holes is installed on the base end side of the outer container 31, and air supplied from an air supply source (not shown) is rectified by the perforated plate 35. It is made to flow uniformly into the supply passage 33a.
[0037]
  In the second embodiment, the flow path of the air supplied from the air supply source flows into the supply passage 33a that is significantly narrowed due to the presence of the interior container 32, and the air that has passed through the supply passage 33a flows into each jet port 34. Will be blown out into the combustion space 2. For this reason, the flow velocity of the air flow is greatly increased in the supply passage 33a, and the increased air comes into contact with the inner wall surface 312 of the outer container 31, so that the cooling of the outer container 31 can be promoted. it can. Thereby, even if the flow rate of the air supplied from the air supply source decreases, the cooling function can be maintained by the above speed increase, and the durability can be maintained and improved.
[0038]
<Third Embodiment>
  FIG. 3 shows an air ejection part 3b of the third embodiment. The air ejection part 3b is configured such that a rectifying plate 36 is interposed in the upstream position of the supply passage 33a instead of the porous plate 35 of the second embodiment.
[0039]
  That is, when the two-stage combustion apparatus is a rectangular tube type and the outer container 31 has a rectangular shape in plan view, the rectifying plate 36 is formed on the strip plate member 361 as shown in FIG. On the other hand, when the through holes 362, 362,... Are opened at substantially equal intervals in the entire length in the longitudinal direction, and the two-stage combustion apparatus is cylindrical and the outer container 31 has a dome shape. As shown in FIG. 4 (b), through-holes 362, 362,... Are opened at substantially equal intervals on the entire circumference in the circumferential direction of the donut plate-like member 363.
[0040]
  In the case of the third embodiment, air from the air supply source passes through the through holes 362 and flows into the supply passage 33a. The air passing through can be uniformly contacted over the entire surface. For this reason, the exterior container 31 can be cooled uniformly and the entire exterior container 31 can be effectively cooled.
[0041]
<Fourth embodiment>
  FIG. 5 shows an air ejection part 3c of the fourth embodiment. The air ejection part 3c is obtained by interposing a heat transfer member 37 in the supply passage 33a.
[0042]
  That is, the heat transfer member 37 corresponds to the case where the outer container 31 has a rectangular shape in plan view in FIG. 6A (for example, the case where the two-stage combustion apparatus is a rectangular tube type), and FIG. As shown in FIG. 2 (for example, when the two-stage combustion apparatus is cylindrical), the corrugated plate has a wave height corresponding to the inner width of the supply passage 33a. It is configured. And the convex wave part 371 of the said heat-transfer member 37 contacts the inner wall surface 312 of the exterior container 31, and it arrange | positions so that the concave wave part 372 may contact the outer wall surface 321 of the interior container 32, and, thereby, supply passage In FIG. 6A, the opening cross section of 33a is divided over the entire length in the longitudinal direction, and in the case of FIG. 6B, it is divided over the entire circumference in the circumferential direction.
[0043]
  In the case of the fourth embodiment, it is possible to obtain the cooling effect of the exterior container 31 and the like by the air passing through the supply passage 33a, and the heat received by the exterior container 31 is interior via the heat transfer member 37. The cooling effect by transferring heat to the container 32 side can also be obtained. In addition, since the supply passage 33a is equally divided and sectioned by the corrugated plate-shaped heat transfer member 37, the flow velocity of air in each of the divided supply passages 33a can be made substantially uniform. Thereby, the cooling effect of the inner wall surface 312 of the exterior container 31 can be obtained uniformly over the entire surface.
[0044]
<Fifth Embodiment>
  FIG. 7 shows an air ejection part 3d of the fifth embodiment. This air ejection portion 3d is formed by integrally forming a large number of convex portions 38, 38,... On the outer wall surface 321 of the inner container 32a, and enables heat transfer from the outer container 31 via the respective convex portions 38. It is.
[0045]
  That is, on the outer wall surface 321 of the side wall of the interior container 32a, as shown in FIG. 8, a plurality of convex portions 38, 38,... Projecting outward and abutting against the inner wall surface 312 of the exterior container 31 are shown in FIG. As shown, they are integrally formed in a staggered arrangement.
[0046]
  In the case of the fifth embodiment, the cooling effect of the outer container 31 and the like by the air passing through the supply passage 33a can be obtained, and the heat received by the outer container 31 is passed through the convex portions 38. In addition, a cooling effect can be obtained by transferring heat to the interior container 32 side. Further, since the air flow passing through the supply passage 33a (see the dotted arrows in FIG. 8) is dispersed by the convex portions 38, the cooling effect of the inner wall surface 312 of the outer container 31 can be obtained evenly over the entire surface. Can do. Furthermore, when the inner container 32a is assembled to the outer container 31, the inner container 32a can be easily and reliably positioned with respect to the outer container 31 by the projections 38, and a gap for the supply passage 33a is reliably ensured. be able to.
[0047]
<First referenceForm>
  FIG. 9 illustrates the present invention.First referenceThe two-stage combustion apparatus which concerns on a form is shown. In FIG. 9, the code | symbol 3e is an air ejection part, This air ejection part 3e is comprised only by the exterior container 31 in 1st-5th embodiment. Further, in the figure, reference numeral 22a denotes a guide wall, and this guide wall 22a is arranged in the same manner as the guide wall 22 of the first to fifth embodiments, and the narrowed portion 23 is formed by the inner edge thereof. Yes. Further, reference numeral 5 denotes an air passage, and this air passage 5 is formed continuously from the outer surface side of the partition wall 21 partitioning the combustion space 2 to the inside of the guide wall 22a.
[0048]
  The air passage 5 is blown out as a part of secondary air to the combustion space 2 from the outlets 222, 222,... Of the guide wall 22a after passing air supplied from the upstream side along the inside. It is like that. At this time, after the air is guided to the inner wall surface 223 of the inner end edge 221 by the guide member 51 disposed in the inner space of the guide wall 22a, the air is blown out from the respective outlets 222.
[0049]
  thisFirst referenceIn the case of the form, the air passing through the air passage 5 takes heat while contacting the partition wall 21 and the induction wall 22a adjacent to the flame flames 42, 42,. The cooling of the wall 21 and the guide wall 22a can be promoted. In addition, at this time, the air in the air passage 5 is guided to the inner end edge 221 of the guide wall 22a and comes into contact with the inner wall surface 223. Therefore, the inner end edge 221 that is particularly easily heated to a high temperature can be reliably cooled. it can. At this time, the flow passage area of the air passage 5 can be made the same or smaller by the guide member 51, and the inner end edge 221 can be effectively cooled by maintaining or increasing the air flow rate. it can. And since the air flowed for cooling is blown out from each blowing port 222 to the combustion space 2, it can be effectively used as secondary air.
[0050]
<Second referenceForm>
  FIG. 10 illustrates the present invention.Second referenceThe two-stage combustion apparatus which concerns on a form is shown. thisSecond referenceThe form is the aboveFirst reference.. Are formed integrally with the guide member 51 in the embodiment. Other components areFirst referenceSince the configuration is the same as that of the embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
[0051]
  Each protrusion 52 protrudes from the guide member 51 as shown in FIG. 11 and has an inner wall surface 224 on the side of the guide wall 22a facing the flame hole flames 42, 42,. It comes into contact with the inner wall surface 223. Then, the heat of both the inner wall surfaces 223 and 224 is transferred through the convex portions 52 to promote cooling, while the air passing therethrough is evenly dispersed to obtain a uniform cooling effect. In addition, positioning at the time of installation of the guide member 51 can be easily performed.
[0052]
<Third referenceForm>
  FIG. 12 illustrates the present invention.Third referenceThe two-stage combustion apparatus which concerns on a form is shown. thisThird referenceThe form of the air flow in the guide wall 22b is as described above.First or second referenceThe configuration is different from the air flow in the guide wall 22a. Other components areFirst or second referenceSince the configuration is the same as that of the embodiment, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
[0053]
  thisThird referenceIn the embodiment, an internal member 53 is disposed in the internal space of the guide wall 22b to form a double wall structure. After the air supplied from the upstream side by the internal member 53 is guided to the inside of the internal member 53, the air is blown to the inner wall surface 224 on the flame hole flame 42 side through the communication holes 531, 531, and the communication hole Air is blown to the inner wall surface 223 of the inner edge 221 through 532. Thereby, the cooling of the inner wall surfaces 224 and 223 on the flame hole flame 42 side and the narrowed portion 23 side of the guide wall 22b can be promoted. Eventually, the air is blown out as secondary air from the blow-out port 222 to the combustion space 2 and effectively used.
[0054]
<4th referenceForm>
  FIG.4th referenceThe main part of the two-stage combustion apparatus of a form is shown. this4th referenceIn the embodiment, the air after cooling the partition wall 21 and the guide wall 22c is guided to the air supply pipes 43, 43,... On the flame hole surface 4, and primary air for combustion of the flame holes 42, 42,. As an effective use. In FIG. 13, only the main part mainly composed of the air passages 5a and 5b is shown, but other configurations not shown are as described above.1st to 3rd referenceIt is the same as the form.
[0055]
  4th referenceIn the embodiment, by providing the partition wall 54, the inside of the air passage 5 is folded back by the outer air passage 5 a that guides air from the outside to the inner wall surface 223 of the inner end edge 221 of the guide wall 22 c, and the inner wall surface 223. It is partitioned into an inner wall surface 224 on the 42 side and an inner air passage 5b through which the inner wall surface of the partition wall 21 passes. The downstream end of the inner air passage 5 b is communicated with each air supply pipe 43. Thereby, the air which cooled the induction | guidance | derivation wall 22c and the partition wall 21 can come to be effectively utilized now as the primary air for the primary combustion in the flame hole surface 4. FIG.
[0056]
<5th referenceForm>
  FIG.5th referenceThe main part of the two-stage combustion apparatus of a form is shown. Note that the two-stage combustion apparatus shown in FIG.4th referenceAs with the configuration, only the main part is shown, and other configurations not shown are the above1st to 3rd referenceIt is the same as the form.
[0057]
  this5th referenceIn the embodiment, a cooling medium circulation path 6 for cooling the air in the empty passage 5c is added to the air passage 5c for cooling the partition wall 21 and the guide wall 22c.
[0058]
  this5th referenceIn the embodiment, the air passage 5 c and the circulation path 6 are adjacent to each other through the partition member 7. The air passage 5c flows the supplied air along the partition wall 21 toward the guide wall 22d, and flows along the inner wall surface 224 of the guide wall 22d on the flame hole flame 42 side and the inner wall surface 223 of the inner edge 221. Then, the air is blown out as secondary air from the air outlets 222, 222,. On the other hand, the circulation path 6 is formed as a reciprocating path by an internal member 61, and after returning a cooling medium (for example, water) to the inner end edge 221 side, it returns while contacting the partition wall member 7.
[0059]
  Thereby, the air flowing into the air passage 5c can be cooled by contact with the cooling medium through the partition member 7, and the cooling effect of the partition wall 21 and the guide wall 22d can be further enhanced.
[0060]
<Other embodiments>
  In addition, this invention is the said 1st-1st.5thThe present invention is not limited to the embodiments and includes various other embodiments. For example, the interior container 32 of the first embodiment may be configured using, for example, a porous material or a porous plate material. Moreover, in the said 4th Embodiment, although the corrugated plate-shaped heat-transfer member 37 was shown, as long as it is a material which can transfer heat, the thing of any shape is applicable regardless of the shape.
[0061]
  further,1st to 5th referenceYou may make it apply the air ejection parts 3, 3a-3d in any one of 1st-5th embodiment with respect to a form.
[Brief description of the drawings]
FIG. 1 is an explanatory cross-sectional view showing a first embodiment of the present invention.
FIG. 2 is an explanatory cross-sectional view showing a main part of a second embodiment.
FIG. 3 is an explanatory cross-sectional view showing a main part of a third embodiment.
4 is an enlarged arrow view from line AA in FIG. 3. FIG. 4 (a) shows a current plate when the air ejection portion has a rectangular shape in plan view, and FIG. ) Shows the current plate when the air ejection part has a dome shape.
FIG. 5 is an explanatory cross-sectional view showing a main part of a fourth embodiment.
6 is an enlarged partial cross-sectional view taken along line BB in FIG. 5. FIG. 6 (a) shows a heat transfer member when the air ejection portion has a rectangular shape in plan view, and FIG. ) Shows a heat transfer member when the air ejection portion has a dome shape.
FIG. 7 is an explanatory cross-sectional view showing a main part of a fifth embodiment.
8 is an enlarged partial sectional view taken along line CC in FIG.
FIG. 9 is an explanatory cross-sectional view showing a first reference embodiment.
FIG. 10 is an explanatory cross-sectional view showing a second reference embodiment.
11 is a partial cross-sectional view taken along the line DD of FIG.
FIG. 12 is an explanatory cross-sectional view showing a third reference embodiment.
FIG. 13 is an explanatory cross-sectional view showing a main part of a fourth reference embodiment.
FIG. 14 is an explanatory cross-sectional view showing a main part of a fifth reference embodiment.
FIG. 15 is a cross-sectional explanatory diagram for explaining a conventional problem.
[Explanation of symbols]
2 Combustion space
3, 3a-3d Air outlet
4 Flame surface
5,5a-5c Air passage
22a-22d guide wall
31 exterior container
32, 32a Inner container
33, 33a supply passage
34 Spout
37 Heat transfer member
38 Convex
42 Flame Hole Flame
311 Tip
312 Inner wall surface of outer container
321 Outer wall of inner container
323 communication hole

Claims (3)

A flame hole surface that burns a rich fuel gas with an air concentration lower than the theoretical combustion air amount and a high fuel concentration toward the combustion space, and a tip portion that is supplied with air and protrudes downstream of the combustion space. An air blowing portion for blowing the next air is disposed adjacent to the air blowing portion;
A flow of combustion gas generated from a flame flame formed on the flame hole surface is configured to be guided to a tip portion of the air ejection portion and receive a blowout of secondary air,
The air ejection part has a double-wall structure with an outer container having a jet outlet through which a secondary air is blown out at a tip part and an inner container accommodated in the outer container, and the inner wall surface of the outer container A supply passage for supplying secondary air to the outlet is formed by a gap between the inner wall and the outer wall surface ,
The internal container includes a communication hole for communicating inside and outside the container, and the air supplied into the internal container is configured to be supplied to the supply passage through the communication hole. . A flame hole surface that burns a rich fuel gas with an air concentration lower than the theoretical combustion air amount and a high fuel concentration toward the combustion space, and a tip portion that is supplied with air and protrudes downstream of the combustion space. An air blowing portion for blowing the next air is disposed adjacent to the air blowing portion;
A flow of combustion gas generated from a flame flame formed on the flame hole surface is configured to be guided to a tip portion of the air ejection portion and receive a blowout of secondary air,
The air ejection part has a double-wall structure with an outer container having a jet outlet through which a secondary air is blown out at a tip part and an inner container accommodated in the outer container, and the inner wall surface of the outer container A supply passage for supplying secondary air to the outlet is formed by a gap between the inner wall and the outer wall surface,
A two-stage combustion apparatus, wherein a heat transfer member is interposed in a gap between the outer container and the inner container, and heat is transferred from the outer container to the inner container via the heat transfer member. A flame hole surface that burns a rich fuel gas with an air concentration lower than the theoretical combustion air amount and a high fuel concentration toward the combustion space, and a tip portion that is supplied with air and protrudes downstream of the combustion space. An air blowing portion for blowing the next air is disposed adjacent to the air blowing portion;
A flow of combustion gas generated from a flame flame formed on the flame hole surface is configured to be guided to a tip portion of the air ejection portion and receive a blowout of secondary air,
The air ejection part has a double-wall structure with an outer container having a jet outlet through which a secondary air is blown out at a tip part and an inner container accommodated in the outer container, and the inner wall surface of the outer container A supply passage for supplying secondary air to the outlet is formed by a gap between the inner wall and the outer wall surface,
A two-stage combustion apparatus in which one or two or more protrusions that protrude toward the gap between the inner wall surface and the outer wall surface of the inner container and are in contact with the other are partially formed on one of the inner wall surface and the outer wall surface of the inner container .

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