JP2009014279A - Burner plate and power generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology for effectively restraining flame noise caused by burning in a burner. <P>SOLUTION: This invention is embodied as a burner plate for use in a burner for the totally aerated combustion system. In the burner plate, a first area where a plurality of unit flame holes are periodically disposed and a second area where the unit flame holes are dispersed are formed on the surface thereof. In the burner plate, the first area and the second area do not overlap each other. In the burner plate, the unit flame holes in the second area are disposed so that the interval between the unit flame hole and its closest unit flame hole is larger than the interval between the unit flame holes in the first area. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for suppressing combustion noise associated with combustion of a burner.

A home cogeneration system has been developed. A power generation apparatus using a Stirling engine that generates AC power using the combustion heat of gas fuel is suitable for a household cogeneration system. The power generation device using the Stirling engine has the following advantages.
(1) Fast response to thermal load fluctuations.
(2) The heat source is outside the power generator and heat recovery is easy.
(3) Since the device itself is small and does not require explosive combustion, it is highly quiet.

  In a power generator using a Stirling engine, various burners are used to supply heat to the engine. For example, Patent Document 1 describes a configuration using an annular burner as a heating means. Patent Document 2 describes a configuration in which a plate burner for all primary combustion is used as a heating means.

  In a power generation device using a Stirling engine, when a burner is used as a heating source, generation of combustion noise may be a problem. The generation of combustion noise is considered to be caused by a large pressure fluctuation in the combustion gas due to the vibration of the burner flame. When this combustion noise resonates with the equipment in the power generation device, a large noise is caused. The present applicant has developed various techniques to suppress burner combustion noise. For example, in Patent Document 3, three types of large, medium, and small flame openings are arranged in a lattice pattern, and a depression centered on the large flame opening is provided, and the depression includes a part of the small flame opening, A technique for suppressing combustion noise is disclosed. Patent Document 4 discloses a technique for suppressing combustion noise by closing a part of the flame ports in a burner plate in which flame ports are formed in a predetermined periodic pattern.

JP 2005-525499 A JP 2007-113425 A JP-A-6-147434 JP-A-11-351522

  By using the techniques of Patent Literature 3 and Patent Literature 4, combustion noise accompanying combustion of the burner can be suppressed to some extent, but a technology that can more effectively suppress combustion noise is desired. .

  The present invention solves the above problems. The present invention provides a technique capable of effectively suppressing combustion noise associated with burner combustion.

  The present invention is embodied as a burner plate used in a burner for all primary combustion. The burner plate has a first region in which a plurality of unit flame holes are periodically arranged and a second region in which unit flame holes are dispersedly arranged on the surface thereof. In the burner plate, the first region and the second region do not overlap. In the burner plate, the unit flame holes in the second region are arranged such that the interval from the unit flame port to the nearest unit flame port is larger than the interval between the unit flame ports in the first region. ing.

  In this burner plate, the coupled vibration associated with the periodicity of the flames from the plurality of unit flames in the first region is disturbed by the interaction with the flames from the unit flames arranged in a distributed manner in the second region. Gas pressure fluctuations are weakened. By adopting such a configuration as the burner plate, combustion noise associated with combustion of the burner can be suppressed.

  In the burner plate, the unit flame outlet preferably includes a large-diameter main flame mouth and a small-diameter auxiliary flame mouth arranged around the main flame mouth.

  In this burner plate, the flame from the main flame mouth and the flame from the auxiliary flame mouth interfere with each other, and a stable flame can be formed. The vibration of the flame is suppressed, and the combustion noise at the time of combustion of the burner can be further suppressed.

  In addition, this invention can also be embodied as an electric power generating apparatus using a Stirling engine using the burner provided with the above-mentioned burner plate as a heating means. A highly quiet power generator can be realized.

  ADVANTAGE OF THE INVENTION According to this invention, the combustion noise accompanying combustion of a burner can be suppressed effectively.

The main features of the embodiments described below are listed first.
(Mode 1) In the first region, a large number of unit nozzles are densely arranged in a lattice pattern.

  An embodiment of a power generator 100 embodying the present invention will be described in detail with reference to the drawings. 1 includes a free piston type Stirling engine 102, a combustor 104 that supplies heat to a heating unit 102a of the Stirling engine 102 by gas combustion, and a support frame that supports the Stirling engine 102 and the combustor 104. 106 is provided.

  The Stirling engine 102 includes a displacer and a power piston (not shown). When the combustor 104 heats the heating unit 102a located at the top of the Stirling engine 102, heat energy is supplied to the working fluid inside the Stirling engine 102, and the displacer and the power piston reciprocate to generate AC power. Let The Stirling engine 102 is suspended from the support frame 106 via a support rod 110.

  The combustor 104 is placed on the support frame 106 so as to cover the heating unit 102 a of the Stirling engine 102. The combustor 104 includes a burner 108, an air supply passage 116, a combustion exhaust passage 118, an exhaust cylinder 120, and the like. Air is fed into the air supply passage 116 by an air supply fan (not shown). A gas nozzle 114 is provided in the air supply passage 116, and the air fed by the air supply fan is mixed with the fuel gas from the gas nozzle 114 and supplied to the burner 108 as a premixed gas. The burner 108 is a burner for all primary combustion, and includes a burner plate 112 having a through hole and a spark plug (not shown) that ignites the premixed gas ejected from the burner plate 112. The burner plate 112 is a ceramic heat-resistant plate, and is disposed to face the heating unit 102 a of the Stirling engine 102. The premixed gas that has passed through the through hole of the burner plate 112 is ejected from a flame port formed on the surface facing the heating unit 102a, and heats the heating unit 102a with combustion heat. The combustion exhaust gas after heating the heating unit 102a is recovered by heat while flowing through the combustion exhaust passage 118 and exhausted from the exhaust cylinder 120.

  FIG. 2 shows the flame outlet arrangement on the surface of the burner plate 112. On the surface of the burner plate 112, a first region 202 in which a large number of unit flame ports 206 are periodically arranged and a second region 204 in which four unit flame ports 208 are arranged are formed. The first region 202 is formed in a wide hexagonal shape on the surface of the burner plate 112. The second region 204 is formed inside the first region 202 so as not to overlap the first region 202. In the first region 202, a large number of unit flame ports 206 are closely arranged so as to form a two-dimensional hexagonal lattice. In the second region 204, the respective unit nozzles 208 are arranged so as to be spaced apart from the unit nozzles 206 in the first region 202 and from the other unit nozzles 208 in the second region 204. ing. In other words, the unit flame port 208 in the second region 204 has a distance from the unit flame port 208 to the other unit flame port 206 or 208 closest to the unit flame port 208 is larger than the interval between the unit flame ports 206 in the first region 202. It is arranged to be larger. When the burner 108 burns, the heating unit 102a of the Stirling engine 102 is heated by a strong heating power at a portion facing the first region 202, and heated by a weak heating power at a portion facing the second region 204. By employ | adopting such a structure, the overheating of the center part of the heating part 102a is suppressed.

  Hereinafter, the unit flame ports 206 and 208 arranged on the surface of the burner plate 112 of the present embodiment will be described. Since the unit flame mouth 206 and the unit flame mouth 208 have the same configuration, the unit flame mouth 206 will be described below as an example. FIG. 3 shows an enlarged configuration of the unit flame outlet 206. The unit flame port 206 includes a large flame port 302 having a diameter of 1.9 mm disposed in the center and four medium flame ports 304 a, 304 b, 304 c, and 304 d having a diameter of 1.3 mm disposed so as to surround the large flame port 302. And four small flame outlets 306a, 306b, 306c and 306d having a diameter of 1.0 mm, which are arranged between the respective flame outlets 304a, 304b, 304c and 304d so as to surround the large flame outlet 302. . The large flame mouth 302 is also called a main flame mouth, and the middle flame mouths 304a, 304b, 304c, and 304d and the small flame mouths 306a, 306b, 306c, and 306d are also called auxiliary flame mouths.

  In the burner plate 112 of the present embodiment, the unit flame outlets 206 are arranged so that the middle flame outlets 304 a, 304 b, 304 c, and 304 d surround the large flame outlet 302. As a result, the flame caused by the combustion of the premixed gas ejected from the large flame outlet 302 and the flame caused by the combustion of the premixed gas ejected from the middle flame outlets 304a, 304b, 304c and 304d interfere with each other, thereby stabilizing the flame. Can be formed. Further, in the burner plate 112, small flame ports 306a, 306b, 306c, and 306d are disposed between the middle flame ports 304a, 304b, 304c, and 304d so as to surround the large flame port 302 in each unit flame port 206. Therefore, the flames of the large flame port 302 and the middle flame ports 304a, 304b, 304c, and 304d interfere with each other with the flames of the small flame ports 306a, 306b, 306c, and 306d to further stabilize the flame. be able to.

  As shown in the longitudinal sectional view of FIG. 4, a conical depression D having an apex angle θ is formed concentrically with the large flame outlet 302 in the unit flame outlet 206. The recess D is formed so that the outer edge thereof covers each of the small flame openings 306a, 306b, 306c, 306d. Due to the recess D, the flame from the large flame port 302 is easily merged with the flames from the small flame ports 306a, 306b, 306c, 306d, and a more stable flame is formed.

  As shown in FIG. 2, a first region 202 in which a large number of unit flame ports 206 are periodically arranged is formed on the surface of the burner plate 112. For this reason, when the burner 108 is burned, a large pressure fluctuation may occur in the combustion gas due to the combined vibration of the flames from the unit flame ports 206 in the first region 202, and combustion noise may be generated. If this combustion noise resonates with the Stirling engine 102 or the combustor 104 during the operation of the power generation apparatus 100, a large noise is generated.

  However, in the burner plate 112 of the present embodiment, unit flame ports 208 are arranged in the second region 204 inside the first region 202 so as to be spaced from other unit flame ports. The flame from the unit flame port 208 in the second region 204 disturbs the regularity of the flame from each unit flame port 206 in the first region 202, and weakens the combined vibration of the flame from each unit flame port 206. Works. The presence of the unit flame port 208 on the surface of the burner plate 112 can suppress combustion noise when the burner 108 is burned. A silent power generation apparatus 100 can be realized.

  In this embodiment, the case where the four unit nozzles 208 are formed in the second region 204 of the burner plate 112 has been described. However, the arrangement of the unit nozzles 208 in the second region 204 is limited to this. Absent. If the arrangement is such that the regularity of the flame from each unit nozzle 206 in the first region 202 is disturbed, no matter how the unit flame 208 is arranged, the combustion noise during combustion of the burner 108 is suppressed. Can do. For example, as shown in FIG. 5, six unit flame ports 208 may be arranged in the second region 204, and although not shown, a single unit flame port 208 may be arranged in the second region 204. .

  In the present embodiment, the disc-shaped burner plate 112 having a flat surface has been described as an example. However, the surface shape of the burner plate 112 is not limited to this, and the surface may be convex or concave, for example. Alternatively, the overall shape of the burner plate 112 may be a rectangle or a polygon instead of a disc shape.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

FIG. 1 is a diagram schematically showing the configuration of the power generation apparatus 100. FIG. 2 is a view showing an example of a flame outlet arrangement on the surface of the burner plate 112. FIG. 3 is an enlarged view showing the configuration of the unit flame port 206. FIG. 4 is a view showing a longitudinal section of the unit flame port 206. FIG. 5 is a view showing another example of the flame outlet arrangement on the surface of the burner plate 112.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100: Electric power generation apparatus 102: Stirling engine 102a: Heating part 104: Combustor 106: Support frame 108: Burner 110: Support rod 112: Burner plate 114: Gas nozzle 116: Supply air flow path 118: Combustion exhaust flow path 120: Exhaust pipe 202 : First area 204: second area 206, 208: unit flame mouth 302: large flame mouth 304a, 304b, 304c, 304d: medium flame mouth 306a, 306b, 306c, 306d: small flame mouth

Claims (3)

A burner plate used for a burner for all primary combustion,
A first region in which a plurality of unit flame holes are periodically arranged and a second region in which unit flame holes are dispersed and formed are formed on the surface,
The first area and the second area do not overlap,
The burner plate in which the unit flame holes in the second region are arranged such that the interval from the unit flame port to the nearest unit flame port is larger than the interval between the unit flame ports in the first region.   2. The burner plate according to claim 1, wherein the unit flame mouth includes a large-diameter main flame mouth and a small-diameter auxiliary flame mouth arranged around the main flame mouth.   A power generator using a Stirling engine, wherein the burner comprising the burner plate according to claim 1 or 2 is used as a heating means.

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