JP5376868B2 - Combustor member and combustor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a member for a combustor suitable for mass productivity and easily obtaining high heat efficiency, and the combustor using the same. <P>SOLUTION: This member 10 for the combustor has a gas flow channel 12 reaching a central section from an outer periphery by roughly one round on a surface of a metallic plate. A width of the gas flow channel 12 is preferably increased or decreased along the gas flowing direction, or formed in a meandering state. A thickness of the metallic plate is preferably within a range of 1-4 mm. The combustor 20 uses the member 10 for the combustor as a member constituting a premixing chamber 24 and/or a combustion chamber 26. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a combustor member and a combustor.

  Conventionally, for example, electric heaters have been widely used as household and commercial heating devices. Generally, this type of electric heater loses much of the energy of fossil fuel during power generation / transmission, so it is said that the energy utilization efficiency for fossil fuel is about 40%.

  In recent years, further energy saving has been promoted from the viewpoint of suppressing the load on the global environment, and attempts have been actively made to make effective use of energy for heating devices.

  Under such circumstances, a combustor called a micro combustor has been proposed as an alternative to an electric heater. Since this micro combustor can directly use the heat of combustion of fossil fuel, the power generation process that loses about 60% of energy can be omitted. Therefore, it is expected as a technology that can achieve significant energy saving.

  For example, Patent Document 1 and Patent Document 2 describe a spiral premixed gas flow path for supplying a premixed gas from the outside toward the center, and a spiral for discharging exhaust gas generated by combustion at the center to the outside. A one-layered combustor in which a gas exhaust gas flow path is partitioned by a heat transfer wall is disclosed.

  Further, for example, Patent Document 3 discloses a two-layer combustor in which two of a premixing chamber and a combustion chamber each having a spiral gas flow path are stacked.

  In this two-layer combustor, the premixed gas supplied from the outside reaches the center of the premixing chamber through a spiral gas flow path in the premixing chamber. The premixed gas that has reached the central portion of the premixing chamber is jetted to the central portion of the combustion chamber through a flame extinguishing hole formed in the heat transfer partition between the premixing chamber and the combustion chamber. Exhaust gas generated by combustion in the center of the combustion chamber is discharged to the outside of the combustion chamber through a spiral gas flow path in the combustion chamber.

JP 2007-82676 A JP 2007-85618 A JP 2007-155216 A

  However, the conventional combustor has room for improvement in the following points.

  That is, the conventional combustor uses a spiral gas flow path wound a plurality of times (for example, the combustors of Patent Documents 1 to 3 have about 8 turns). The combustor member having such a spiral gas flow path must be formed by casting, grinding, or the like. Therefore, there was a problem that the mass productivity was poor. In addition, casting and grinding are difficult to reduce the thickness and are disadvantageous from the viewpoint of obtaining high thermal efficiency.

  The present invention has been made in view of the above problems, and a problem to be solved by the present invention is to provide a combustor member that is excellent in mass productivity and easily obtains high thermal efficiency, and a combustor using the same. There is.

In order to solve the above-mentioned problems, the combustor member according to the present invention has a gas flow path from the outer periphery to the center part on the metal plate surface, and the flow width of the gas flow path The gas channel is formed in a meandering shape along the flow direction, the thickness of the metal plate is in the range of 1 to 4 mm, and a groove portion into which an airtight packing is fitted on the outer periphery of the gas channel The gist is that is formed .

  The combustor member may be used to form a premixing chamber of the combustor or to form a combustion chamber of the combustor.

  When the combustor member is used to form a combustion chamber of the combustor, the gas channel width may be maximized at the end on the center side.

  The gist of the combustor according to the present invention is to have the combustor member.

  The combustor member according to the present invention has a gas flow path from the outer periphery to the central portion in a substantially single turn on the metal plate surface. Since this gas flow path has a shape extending from the outer periphery to the central portion in a substantially single turn, it can be formed by press-molding a metal plate. Therefore, it is excellent in mass productivity. Further, it is possible to manufacture at a lower cost than in the case of casting or grinding. Further, since the flow path wall is easily thinned, it is easy to improve the thermal efficiency.

Further, the flow path width of the gas channel, because the increase or decrease in the flow direction of the gas, is easily earn residence time of the gas flowing through the gas flow path. Therefore, for example, heat exchange such as gas preheating is facilitated. Further, since the gas flow path is formed in a meandering shape, the same effect can be obtained.

Further, since the thickness of the metal plate is in the range of 1 to 4 mm, it is excellent in compatibility with press formability and thermal efficiency.

Further, since the groove fitting the air tight packing on the outer periphery of the gas flow path is formed, it becomes easy to ensure the airtightness of the combustor.

  When the combustor member is used to form a combustion chamber of the combustor, when the channel width of the gas channel is maximized at the end on the center side, the high temperature due to combustion occurring in this portion This makes it difficult to touch the flow path wall. For this reason, it becomes difficult for heat to be taken away by the high-temperature flame coming into contact with the flow path wall, and it is easy to contribute to the reduction of the CO concentration.

  Since the combustor according to the present invention uses the combustor member, it is excellent in mass productivity. Moreover, high thermal efficiency can be realized by thinning. Further, it can be manufactured at a lower cost than the conventional one.

  Hereinafter, a combustor member according to an embodiment of the present invention (hereinafter sometimes referred to as “main member”) and a combustor according to an embodiment of the present invention (hereinafter referred to as “present combustor”) will be described. To do.

  FIG. 1 is a plan view showing an example of this member. 2 is a cross-sectional view taken along line AA in FIG. FIG. 3 is a plan view showing another example of this member. 4 is a cross-sectional view taken along line BB in FIG.

  The member 10 shown in FIG. 1 can be suitably used to form a premixing chamber of a combustor. Moreover, this member 10 shown in FIG. 3 can be used suitably in order to form the combustion chamber of a combustor.

  As shown in these drawings, the member 10 is basically composed of a metal plate, and a gas flow path 12 is formed on the metal plate surface.

  In the member 10, the gas flow path 12 extends from the outer periphery to the central portion with approximately one turn (from the central portion to the outer periphery with approximately one turn). By making the gas flow path 12 into a shape that extends from the outer periphery to the central portion with approximately one turn, it is possible to press the flat metal plate and form the gas flow path 12. Therefore, as long as the press formability is not impaired, the gas flow path 12 may be connected to the outer periphery and the center immediately before the flow path is wound, or the flow path is wound once. Immediately after that, the outer periphery and the center may be connected.

  Moreover, it is preferable that the gas flow path 12 is made so that own flow path walls may not contact between the outer periphery and a center part. This is because press moldability can be improved.

  The channel width of the gas channel 12 can be appropriately determined in consideration of the overall size of the combustor and the like. At this time, the flow path width of the gas flow path 12 is increased or decreased along the flow direction of the gas (premixed gas, exhaust gas, etc.), that is, the flow path width of the gas flow path 12 becomes narrower or wider. Good to be designed to be.

  This is because it is easy to increase the residence time of the gas flowing in the gas flow path 12, and therefore, when applied to a combustor, heat exchange such as preheating of the gas is facilitated. Such an effect can also be obtained by forming the gas flow path 12 in a meandering manner. In order to increase or decrease the channel width of the gas channel 12 or to form the gas channel 12 in a meandering shape, the channel walls may be alternately projected toward the inner side of the channel.

  When the member 10 is used to form a combustion chamber of a combustor, as shown in FIG. 3, the gas channel 12 may have a maximum channel width at the end on the center side. Since a flame due to combustion is formed at the end of the gas channel 12 at the center side, if the flow channel width of this part is maximized, the combustion space becomes wider and the high-temperature flame flows on the channel wall. It becomes difficult to touch. For this reason, it is difficult for the high-temperature flame to come into contact with the flow path wall to remove heat, and to contribute to the reduction of the CO concentration.

  Moreover, it is preferable that the flow path width at the end opposite to the center part of the gas flow path 12 is formed wider than the flow path width up to the center part. Since each gas can be introduced and discharged relatively slowly from the premixed gas inlet 14 (FIG. 1) and the exhaust gas outlet 16 (FIG. 3), heat exchange is applied when applied to a combustor. This is because the efficiency can be improved.

  Examples of the material of the metal plate constituting the member 10 include stainless steel, copper, and copper alloy.

  The thickness of the metal plate is preferably in the range of 1 to 4 mm. When the thickness of the metal plate is less than 1 mm, the press formability is deteriorated and the strength is also lowered. On the other hand, if the thickness of the metal plate exceeds 4 mm, the thermal efficiency tends to deteriorate when applied to a combustor. When the thickness of the metal plate is in the range of 1 to 4 mm, it is easy to achieve both press formability and thermal efficiency.

  In the member 10, it is preferable that a groove portion 18 into which an airtight packing such as an O-ring is fitted is formed on the outer periphery of the gas flow path 12. This is because it becomes easy to ensure the airtightness of the combustor.

  Although the case where the groove portion 18 is formed in the main member 10 on the side forming the premixing chamber of the fuel device is illustrated, the same groove portion is also formed on the main member 10 on the side forming the combustion chamber of the fuel device. May be.

  Next, the present combustor will be described. The combustor basically has a two-layer structure in which a combustion chamber and a premixing chamber are stacked via a heat transfer partition. This combustor has the above-described member as a constituent member. As for this combustor, the combustion chamber may be comprised by this member, and the premixing chamber may be comprised by this member. Alternatively, both the combustion chamber and the premixing chamber may be constituted by this member.

  In addition, when either one of a combustion chamber or a premixing chamber is comprised with this member, the thing formed by casting, grinding, etc. may be sufficient as the other premixing chamber or combustion chamber. This is because the effect of the present invention can be obtained only by applying this member to either the combustion chamber or the premixing chamber.

  In the present combustor, it is preferable that both the combustion chamber and the premixing chamber are formed of this member from the viewpoint of excellent mass productivity and reduction in manufacturing cost. Hereinafter, this case will be described with reference to the drawings.

  FIG. 5 is a cross-sectional view schematically showing an example of the combustor. In FIG. 5, 24 is a premixing chamber by the main member 10 shown in FIG. 1, and 26 is a combustion chamber by the main member 10 shown in FIG. That is, the combustor 20 has a gas flow path forming surface of the main member 10 (upper side) shown in FIG. 1 and a gas flow of the main member 10 (lower side) shown in FIG. It is laminated so as to face the path forming surface. Note that the above lamination may be performed by any method as long as airtightness can be maintained. For example, a method such as joining or fastening with a screw can be used.

  For example, stainless steel, copper, copper alloy, or the like can be used as the material of the heat transfer partition 22. The heat transfer partition wall 22 is formed with a flame extinguishing hole (not shown) that communicates the end of the gas channel 12 of the premixing chamber 24 and the end of the center of the gas channel 12 of the combustion chamber 26. Has been. Thereby, the premixed gas can be ejected from the premixing chamber 24 side toward the combustion chamber 26 side.

  In the present combustor 20, it is possible to adopt a configuration in which a ceramic body having a flame extinguishing hole is fitted into the heat transfer partition 22 without directly forming the flame extinguishing hole in the heat transfer partition 22. In such a case, the heat resistance around the flame extinguishing hole is improved, so that the relatively small flame extinguishing hole is not easily oxidized or deformed by the high heat generated by the flame in the combustion chamber 26. Therefore, the durability of the combustor 20 can be improved.

  And if the ignition point of ignition means (not shown), such as an igniter and a ceramic heater, is arranged at the center side end of the gas flow path 12 on the combustion chamber 26 side of the combustor 20, the combustor Can be used for combustion.

  In the combustor 20, the premixed gas introduced from the introduction port 14 flows along the gas flow path 12 of the premixing chamber 24 and reaches the end portion on the center portion side of the gas flow path 12. The premixed gas that has reached the center side end of the gas flow path 12 is ejected from the flame extinguishing hole of the heat transfer partition wall 22 to the center side end of the gas flow path 12 of the combustion chamber 26. The ejected premixed gas is ignited by an ignition means, a flame is formed, and combustion starts. Exhaust gas generated by the combustion flows in the outer circumferential direction along the gas flow path 12 of the combustion chamber 26 and is discharged from the discharge port 16.

  The combustor member and the combustor according to one embodiment of the present invention have been described above. However, the above embodiment does not limit the present invention, and various modifications and improvements can be made.

It is the top view which showed an example of the member for combustors (premixing chamber side) which concerns on this embodiment. It is AA sectional drawing in FIG. It is the top view which showed an example of the member for combustors (combustion chamber side) which concerns on this embodiment. It is BB sectional drawing in FIG. It is sectional drawing which showed typically an example of the combustor which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Combustor member 12 Gas flow path 14 Inlet port 16 Exhaust port 18 Groove part 20 Combustor 22 Heat-transfer partition wall 24 Premixing chamber 26 Combustion chamber

Claims (5)

On the metal plate surface, it has a gas flow path from the outer periphery to the center part with approximately one turn,
The channel width of the gas channel increases or decreases along the gas flow direction,
The gas flow path is formed in a meandering shape,
The thickness of the metal plate is in the range of 1 to 4 mm,
A combustor member, wherein a groove for fitting an airtight packing is formed on an outer periphery of the gas flow path . The combustor member according to claim 1 , wherein the combustor member is used to form a premixing chamber of the combustor. The combustor member according to claim 1 , wherein the combustor member is used to form a combustion chamber of the combustor. 4. The combustor member according to claim 3 , wherein a flow path width of the gas flow path is maximized at an end portion on a center portion side. 5. Combustor and having a combustor member according to claim 1 or 2.

Images