JP2010270936A - Tubular flame burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tubular flame burner which can be inexpensive and compact while demonstrating characteristics of tubular flame more remarkably. <P>SOLUTION: In the tubular flame burner, mixture of fuel gas and air, or the fuel gas and the air, are eccentrically introduced from a slit 3 opened along a tube axial direction of a cylindrical combustion chamber 2 to be turned/burnt. A flow passage width of an introduction passage 5 for introducing the mixture or the fuel gas and the air to the slit 3 is continuously contracted as it approaches to the combustion chamber 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a structure of a tubular flame burner that can be generally used for heating for home use, commercial use and industrial use.

  A conventional tubular flame burner is provided with a slit that opens along the tube axis direction on the side surface of a cylindrical combustion chamber, and introduces air-fuel mixture or fuel gas and air from the slit toward the tangential direction of the combustion chamber surface. Then, swirl combustion is performed to form a tubular flame (see, for example, Patent Document 1).

Japanese Patent No. 3358527

  One of the practical advantages of tubular flames is that the inner wall of the combustion chamber is covered with a layer of unburned mixture, and the flame is formed more centrally, so the temperature rise in the combustion chamber is suppressed, burner tiles, etc. Even if it is not covered with a refractory material, the combustion chamber can be formed of metal. Therefore, it is possible to manufacture a burner that is inexpensive and resistant to dropping, vibration, and the like during transportation.

In order to suppress the above-described temperature increase in the combustion chamber and perform swirl combustion, it is not always the best policy to introduce air-fuel mixture or fuel gas and air from the tangential direction of the inner surface of the combustion chamber.
In addition, forming a long introduction path in order to make the flow rate distribution of the air-fuel mixture or combustion gas and air uniform has a problem in manufacturing the entire burner in a compact and inexpensive manner.

  The present invention has been made paying attention to such a point, and an object thereof is to provide a tubular flame burner that is inexpensive and compact while making the characteristics of the tubular flame more remarkable.

In order to achieve this object, the characteristic configuration of the tubular flame burner according to the present invention is that a mixture of fuel gas and air or a fuel gas and air mixture is formed from a slit opened along the tube axis direction of a cylindrical combustion chamber. In the tubular flame burner that introduces eccentricity and swirls and burns,
The flow path width of the introduction path for guiding the air-fuel mixture or fuel gas and air to the slit is continuously reduced toward the side closer to the combustion chamber.

  According to this characteristic configuration, the flow path width of the introduction path that guides the mixture of the fuel gas and air or the fuel gas and air (hereinafter sometimes abbreviated as the mixture) to the slit is reduced toward the downstream side. Thus, as compared with an introduction path having a constant width equal to the opening width of the slit, the flow path width increases toward the upstream side of the introduction path, and the pressure loss can be reduced. In addition, since the flow path width of the introduction path is continuously reduced, the pressure loss can be reduced as compared with the case where the width is reduced discontinuously. Therefore, according to the present invention, a low-pressure combustion blower and fan can be used, and energy saving and low cost can be realized. Further, the flow rate distribution in the slit and the directivity of the flow direction can be similarly maintained in the cross section of the introduction path.

The characteristic structure of the tubular flame burner according to the present invention is that swirl combustion is performed by introducing an eccentric mixture of fuel gas and air or a mixture of fuel gas and air from a slit opened along the tube axis direction of a cylindrical combustion chamber. In the tubular flame burner to let
A tangential line of a virtual cylinder having an introduction path for guiding the air-fuel mixture or fuel gas and air to the slit, and the air-fuel mixture or fuel gas and air from the slit being concentric with the combustion chamber and having a smaller diameter than the combustion chamber In this point, the combustion chamber is introduced from a direction or a direction at a smaller angle.

  According to this characteristic configuration, the introduction direction of the air-fuel mixture or the like to the combustion chamber is not the tangential direction of the combustion chamber wall, but the tangential direction of the virtual cylinder having a smaller diameter or a smaller angle than that. It is possible to reliably form a thicker layer of the unburned mixture inside the wall. Here, the angle formed by the straight line extended in the introduction direction for introducing the air-fuel mixture from the connection position of the introduction path to the combustion chamber and the normal passing through the contact point of the virtual cylinder with respect to the straight line is smaller than 90 degrees. By introducing the air-fuel mixture or fuel gas and air from the slit into the combustion chamber, the air-fuel mixture or fuel gas and air are introduced from the slit into the combustion chamber from a direction at a smaller angle than the tangential direction of the virtual cylinder. If the virtual cylinder is made too small, a flame may be formed between the virtual cylinder and the combustion chamber wall at any time, so it is not possible to take an extremely small diameter. Depending on the introduction angle of the air-fuel mixture or the like, about 70 to 95% of the combustion chamber diameter is appropriate.

  A further characteristic configuration of the tubular flame burner according to the present invention is that the introduction path is formed by bending a plate material.

  A conventional tubular flame burner has, for example, a straight air-fuel mixture that extends in a tangential direction from a cylinder such as a pipe, but the introduction path is long and extends in all directions, and the entire burner is bulky. It was a thing. In this feature configuration, the burner is molded at low cost by sheet metal processing of the plate material, and when the combustion chamber and the introduction path are integrated, for example, by bending the introduction path around the outer periphery of the combustion chamber, it is compact. Can be configured.

  A further characteristic configuration of the tubular flame burner according to the present invention is that the introduction path is formed in an arc shape and also serves as a partition wall that separates the air-fuel mixture or the combustion gas from the air.

  As described above, when the introduction path is wound around the outer peripheral portion of the combustion chamber, the simplest is to use an arc. Accordingly, the introduction path can be formed by the roll without using a dedicated mold.

  A further characteristic configuration of the tubular flame burner according to the present invention is that a plurality of integrally molded bodies obtained by integrally molding the combustion chamber and a part of the introduction path with a plate material are formed in a bowl shape around the axis of the combustion chamber. In combination, a tubular flame burner body is formed.

  When the introduction path is formed of a plate material, it is convenient to go further and integrally form the combustion chamber wall, and the burner can be manufactured at low cost. If a relatively thin plate material is used, it is not necessary to process the cross section of the plate into an arc shape, and even a cross section cut perpendicularly causes no problem in forming a swirling flow, so secondary processing is omitted. can do.

  A further characteristic configuration of the tubular flame burner according to the present invention is the fluid flow direction in the introduction path at the end opposite to the combustion chamber in the introduction path or the plate member forming the combustion chamber and the introduction path. It is in the point which comprises a part of channel | path which flows a fluid in a perpendicular | vertical direction.

  When the introduction path or the combustion chamber and the introduction path are configured by the plate material, a passage through which the fluid flows in a direction perpendicular to the flow direction of the fluid in the introduction path is a so-called header of air-fuel mixture or fuel gas and air, and further to the header If molded integrally, the burner can be manufactured more inexpensively and easily. In the case of a tubular flame burner, it is generally necessary to supply an air-fuel mixture or the like to the introduction path in the vertical direction by using a header while suppressing the flow distribution, so that the fluid is supplied in a direction perpendicular to the fluid flow direction in the introduction path. It is more useful to integrally mold the flow passage as a header.

  A further characteristic configuration of the tubular flame burner according to the present invention is that a throttle structure for equalizing the flow rate distribution between the pipe axis direction and the same fluid introduction path is provided in the middle of the introduction path. .

  Evenly, the flow distribution in the inlet pipe is made uniform using a header. However, a more uniform flow distribution can be realized secondarily by providing a throttle part in the middle and taking pressure loss. it can. It is also possible to determine the maximum flow rate by regulating the flow rate of fuel gas or the like.

The perspective view of the tubular flame burner in 1st Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 1st Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 2nd Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 2nd Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 3rd Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 4th Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 4th Embodiment Sectional drawing in the pipe-axis direction of the tubular flame burner in 5th Embodiment

An embodiment of a tubular flame burner according to the present invention will be described with reference to the drawings.
[First Embodiment]
1 and 2 show a first embodiment of a tubular flame burner according to the present invention. FIG. 1 is a perspective view of a tubular flame burner according to the present invention, and FIG. 2 is a cross-sectional view in the tube axis direction of the tubular flame burner according to the present invention. Incidentally, the white arrow in the figure illustrates a tubular flame.
The tubular flame burner 1 includes a cylindrical combustion chamber 2 and a slit 3 opened along the tube axis direction (vertical direction in FIG. 1) on the side surface of the combustion chamber 2, and the tangent line from the slit 3 to the inner surface of the combustion chamber 2. A mixture of fuel gas (e.g., fuel gas such as natural gas) and air is eccentrically introduced toward the direction to perform swirl combustion. Both ends in the tube axis direction of the combustion chamber 2 are closed by flanges (not shown) and are kept airtight, but only one end (upper side in FIG. 1) has the same diameter as the inner diameter of the combustion chamber 2 as a passage for combustion gas. These circular openings are concentrically opened.

  The tubular flame burner 1 introduces a mixture of fuel gas and air into the combustion chamber 2 through the slit 3, and introduces a header 4 that receives the mixture of fuel gas and air into the slit 3. And an introduction path 5. Each of the header 4, the introduction path 5, and the slit 3 is disposed over substantially the entire length in the tube axis direction of the combustion chamber 2 excluding the bottom of the combustion chamber 2. Thereby, as will be described later, the advantage that the pressure loss due to the continuous reduction of the flow path width of the introduction path 5 in the direction orthogonal to the tube axis direction toward the combustion chamber 2 becomes smaller is the combustion chamber 2. Thus, the pressure loss can be effectively reduced. Here, with respect to the combustion chamber of the tubular flame burner 1, not only the combustion space (combustion chamber 2) in the tubular flame burner 1, but also the space (where the flame on the downstream side in the flow direction of the combustion gas exists from the tubular flame burner 1) For example, the combustion chamber of the tubular flame burner 1 includes a space surrounded by a chain line in FIG.

  The header 4 is formed in a cylindrical shape extending along the tube axis direction of the combustion chamber 2, and allows the air-fuel mixture to flow in the tube axis direction of the combustion chamber 2 (the same direction as the flow direction of the combustion gas in the combustion chamber 2). The air-fuel mixture is accepted while being The introduction path 5 has a configuration in which the air-fuel mixture flows in a direction perpendicular to the air-flow direction of the air-fuel mixture in the header 4 and the air-fuel mixture flows toward the slit 3 formed in the side wall of the combustion chamber 2. ing. The flow path width of the introduction path 5 in the direction orthogonal to the tube axis direction is continuously reduced toward the side closer to the combustion chamber 2. That is, the introduction path 5 is configured such that the flow path width at the end on the combustion chamber 2 side is equal to the opening width of the slit 3, and the flow path width increases as the distance from the combustion chamber 2 increases. Has been. As a result, the pressure loss is smaller than that of the introduction path having a constant width equivalent to the opening width of the slit 3. In addition, in the introduction path in which the flow path width is a constant width equivalent to the opening width of the slit 3, the pressure loss is the narrowest compared to the case where the flow distribution may be greatly collapsed if there is a deformation such as a dent in part. There is also a feature that the flow rate distribution is hardly influenced by deformation in the middle. Further, the flow rate of the air-fuel mixture in the header 4 and the introduction path 5 is configured so that the flow rate of the air-fuel mixture can be adjusted by adjusting the rotational speed of a combustion blower, fan, etc., and combustion in the combustion chamber 2 The flow rate of the air-fuel mixture in the header 4 and the introduction path 5 is adjusted so that the state becomes a desired combustion state.

  The combustion chamber 2 is made of a metal tube such as stainless steel having a certain degree of heat resistance, and the introduction path 5 is made of a metal plate. The header 4 is manufactured based on a metal tube such as a gas tube. There is no restriction | limiting in particular in the raw material of the metal plate of the introduction path 5, A coated steel plate, an aluminum galvanized steel plate, a stainless plate, an aluminum plate, etc. can be used.

In this first embodiment, the mixture of fuel gas and air is introduced into the combustion chamber 2 by the header 4, the introduction path 5, and the slit 3, but it is also possible to introduce the fuel gas and air into the combustion chamber 2 separately. Is possible. In other words, a header, introduction path, and slit dedicated to fuel gas for introducing the fuel gas into the combustion chamber 2 are provided, and a header, introduction path, and slit dedicated to air for introducing air into the combustion chamber 2 are provided.
The number of headers 4, introduction paths 5, and slits 3 is not limited to two, and can be changed as appropriate as long as it is one or more. In addition, as described above, in order to introduce the fuel gas and air into the combustion chamber 2 separately, it is sufficient to provide at least one for the fuel gas and one for the air. It can be changed as appropriate.

[Second Embodiment]
3 and 4 show a second embodiment of the tubular flame burner according to the present invention, and show a cross-sectional view in the tube axis direction of the tubular flame burner according to the present invention. This 2nd Embodiment is another embodiment about the introduction direction of the air-fuel | gaseous mixture introduce | transduced into the combustion chamber 2 from the slit 3 in the said 1st Embodiment. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  The air-fuel mixture introduced into the combustion chamber 2 from the slit 3 is introduced into the combustion chamber 2 from the tangential direction of the virtual cylinder 6 concentric with the combustion chamber 2 and having a smaller diameter than the combustion chamber 2 or from a direction at a smaller angle. Yes. In the second embodiment, the flow path width of the introduction path 5 is a constant width equivalent to the opening width of the slit 3.

  In FIG. 3, the slit 3 and the straight line P extended in the introduction direction for introducing the air-fuel mixture from the connection position of the introduction path 5 to the combustion chamber 2 (inner wall outside the introduction path 5) are tangent to the virtual cylinder 6. An introduction path 5 is arranged. Thereby, the air-fuel mixture is introduced into the combustion chamber 2 in the tangential direction of the virtual cylinder 6. The virtual cylinder 6 is concentric with the combustion chamber 2 and has an inner diameter of about 70 to 95% of the inner diameter of the combustion chamber 2.

  In FIG. 4, a straight line P extending in the introduction direction for introducing the air-fuel mixture from the connection position of the introduction path 5 to the combustion chamber 2 (the inner wall outside the introduction path 5) and the contact point of the virtual cylinder 6 with respect to the straight line P are passed. The slit 3 and the introduction path 5 are arranged so that the angle α formed with the normal line H is smaller than 90 degrees. Thereby, the air-fuel mixture is introduced into the combustion chamber 2 from a direction at a smaller angle than the tangential direction of the virtual cylinder 6. The inner diameter of the virtual cylinder 6 is the same as in FIG.

  Also in the second embodiment, as in the first embodiment, each of the header 4, the introduction path 5, and the slit 3 is arranged over substantially the entire length in the tube axis direction of the combustion chamber 2 excluding the bottom of the combustion chamber 2. It is installed. The header 4 is formed in a cylindrical shape extending along the tube axis direction of the combustion chamber 2, and mixes the air-fuel mixture in the tube axis direction of the combustion chamber 2 (the same direction as the flow direction of the combustion gas in the combustion chamber 2). The air-fuel mixture is received while flowing. In addition, the introduction path 5 is configured to flow the air-fuel mixture in a direction orthogonal to the air-flow direction of the air-fuel mixture in the header 4.

[Third Embodiment]
FIG. 5 shows a third embodiment of the tubular flame burner according to the present invention, and shows a sectional view in the tube axis direction of the tubular flame burner according to the present invention. The third embodiment is another embodiment of the configuration for forming the introduction path 5 in the first embodiment, and the other configurations are the same as those of the first embodiment. Is omitted.

  About the introduction path 5, each of a pair of board | plate material is bent, and the circular-arc-shaped introduction path 5 is formed. Thereby, even if it is the introduction path 5 of the same length, the dimension of the whole burner also including the introduction path 5 and the header 4 can be made small.

  Incidentally, in FIG. 5, as for the introduction path 5, the flow path width of the introduction path 5 is continuously reduced toward the side closer to the combustion chamber 2, as in the first embodiment. Thus, the configuration in the second embodiment can also be adopted. That is, the air-fuel mixture introduced into the combustion chamber 2 from the slit 3 has a constant width equivalent to the opening width of the slit 3, or the tangential direction of the virtual cylinder 6 that is concentric with the combustion chamber 2 and smaller in diameter than the combustion chamber 2. It can also be configured to be introduced into the combustion chamber 2 from a smaller angle direction.

[Fourth Embodiment]
6 and 7 show a fourth embodiment of the tubular flame burner according to the present invention, and show a cross-sectional view in the tube axis direction of the tubular flame burner according to the present invention. This 4th Embodiment is another embodiment about the structure for forming the combustion chamber 2, the introduction path 5, and the header 4 in the said 1st Embodiment, About another structure, it is the said 1st Embodiment. Since it is the same, the description is abbreviate | omitted.

  In FIG. 6, a plurality of (for example, two) integrally molded bodies 7 obtained by integrally molding a part of the combustion chamber 2, the introduction path 5, and the header 4 with a plate material are combined in a bowl shape around the axis of the combustion chamber 2. A tubular flame burner body. In the integrally molded body 7 in which a part of the combustion chamber 2 and the introduction path 5 are molded, mixing is performed at the end opposite to the combustion chamber 2 in a direction (tube axis direction) perpendicular to the flow direction of the air-fuel mixture in the introduction path 5. The passage through which air passes is referred to as a header 4, and in addition to a part of the combustion chamber 2 and the introduction path 5, the header 4 is also integrally formed. Thereby, the tubular flame burner 1 can be manufactured only by combining the integral molding 7 which formed a part of combustion chamber 2, the introduction path 5, and the header 4 in the shape of a bowl.

  The integrally molded body 7 is bent in an arc shape from both end portions of the plate material to form the wall portion of the combustion chamber 2, and the arc shape extends continuously outward in the radial direction from the end portion of the wall portion of the combustion chamber 2. The introduction portion 5 is formed by forming the passage 4 and the header 4 is formed by forming a circular hollow space continuously at the end of the introduction passage 5. Thereby, the introduction path 5 is formed in an arc shape by bending the plate material, similarly to the third embodiment, and each of the plurality of integrally molded bodies 7 is formed in substantially the same shape. The plate materials can be appropriately connected by welding or the like. The material of the plate material (metal plate) is preferably a certain amount of heat resistant material (for example, stainless steel, aluminum galvanized steel plate, etc.).

  In FIG. 7, the integrally molded body 7 forms a tubular flame burner body by combining a plurality of (for example, two) integrally molded bodies 7 in which a part of the combustion chamber 2 and the introduction path 5 are integrally molded with a plate material. Yes. The integrally molded body 7 is bent in an arc shape from both end portions of the plate material to form the wall portion of the combustion chamber 2, and the arc shape extends continuously outward in the radial direction from the end portion of the wall portion of the combustion chamber 2. These passages are formed to mold the introduction part 5. A tubular flame burner body is formed by attaching the integrally molded body 7 to the header 4 molded with a metal tube or the like as an integral member, and combining the plurality of members in a bowl shape around the axis of the combustion chamber 2. ing.

  In FIG. 7, a throttle structure 8 is provided in the middle of the arc-shaped introduction path 5 to make the flow rate distribution between the pipe axis direction and the plurality of introduction paths 5 uniform. In FIG. 7, the diaphragm structure 8 is configured by slits (elongated square holes) formed in the side wall portion of the header 4 and opening along the tube axis direction. For example, the throttle structure 8 may be configured by a large number of round holes arranged in the tube axis direction. Furthermore, the narrowest part of the introduction path 5 can also be used as the throttle structure 8. Moreover, the diaphragm structure 8 can also be obtained by applying pressure loss with a perforated plate or a metal mesh. The arrangement position of the throttle structure 8 can be changed as appropriate in the middle of the introduction path 5 from the header 4 to the combustion chamber 2.

  Incidentally, in FIG. 6 and FIG. 7, as for the introduction path 5, the flow path width of the introduction path 5 is continuously reduced toward the side closer to the combustion chamber 2, as in the first embodiment. Instead of the configuration, the configuration in the second embodiment may be employed. That is, the air-fuel mixture introduced into the combustion chamber 2 from the slit 3 has a constant width equivalent to the opening width of the slit 3, or the tangential direction of the virtual cylinder 6 that is concentric with the combustion chamber 2 and smaller in diameter than the combustion chamber 2. It can also be configured to be introduced into the combustion chamber 2 from a smaller angle direction.

[Fifth Embodiment]
FIG. 8 shows a fifth embodiment of the tubular flame burner according to the present invention, and schematically shows a cross section in the tube axis direction of the tubular flame burner according to the present invention. The fifth embodiment is another embodiment that adopts a configuration in which fuel gas and air are separately introduced into the combustion chamber 2 in place of the configuration in which the air-fuel mixture is introduced into the combustion chamber 2 in the fourth embodiment. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

  In FIG. 8, there are two types of the header 4, the introduction path 5, and the slit 3 corresponding to the fluids different from those for fuel gas and air, respectively. A plurality of (for example, two) slits 3 are provided in a state in which they are arranged in the circumferential direction of the combustion chamber 2. Fuel gas and air are alternately arranged in the circumferential direction of the combustion chamber 2. The diaphragm structure 8 is composed of a number of round holes arranged in a line in the tube axis direction. For the slit 3, for example, round holes are provided at intervals in the tube axis direction, and the slits are formed by the plurality of round holes.

  Incidentally, in FIG. 8, as for the introduction path 5, the flow path width of the introduction path 5 is continuously reduced toward the side closer to the combustion chamber 2, as in the first embodiment. Thus, the configuration in the second embodiment can also be adopted. That is, the air-fuel mixture introduced into the combustion chamber 2 from the slit 3 has a constant width equivalent to the opening width of the slit 3, or the tangential direction of the virtual cylinder 6 that is concentric with the combustion chamber 2 and smaller in diameter than the combustion chamber 2. It can also be configured to be introduced into the combustion chamber 2 from a smaller angle direction.

  INDUSTRIAL APPLICABILITY The present invention can be applied to various types of tubular flame burners that can exhibit the characteristics of tubular flames more remarkably and can be made inexpensive and compact.

DESCRIPTION OF SYMBOLS 1 Tubular flame burner 2 Combustion chamber 3 Slit 5 Introductory path 6 Virtual cylinder 7 Integral molding 8 Drawing structure

Claims (7)

A tubular flame burner that performs swirl combustion by introducing an eccentric mixture of fuel gas and air or fuel gas and air from a slit opened along the tube axis direction of a cylindrical combustion chamber,
A tubular flame burner in which the flow path width of the introduction path that guides the air-fuel mixture or fuel gas and air to the slit is continuously reduced toward the side closer to the combustion chamber. A tubular flame burner that swirls and burns by introducing eccentricity of a mixture of fuel gas and air or fuel gas and air from a slit opened along the tube axis direction of a cylindrical combustion chamber,
A tangential line of a virtual cylinder having an introduction path for guiding the air-fuel mixture or fuel gas and air to the slit, and the air-fuel mixture or fuel gas and air from the slit being concentric with the combustion chamber and having a smaller diameter than the combustion chamber A tubular flame burner introduced into the combustion chamber from a direction or a direction at a smaller angle.   The tubular flame burner according to claim 1 or 2, wherein the introduction path is formed by bending a plate material.   The tubular flame burner according to any one of claims 1 to 3, wherein the introduction path is formed in an arc shape and also serves as a partition wall that separates the air-fuel mixture or the combustion gas from the air.   2. A tubular flame burner body is formed by combining a plurality of integrally molded bodies obtained by integrally molding a part of the combustion chamber and the introduction path with a plate material in a bowl shape around the axis of the combustion chamber. The tubular flame burner of any one of -4.   A part of a passage that allows fluid to flow in a direction perpendicular to the fluid flow direction in the introduction path is formed at an end of the plate that forms the introduction path or the combustion chamber and the introduction path on the side opposite to the combustion chamber. The tubular flame burner according to any one of claims 1 to 5.   The tubular flame burner according to any one of claims 1 to 6, further comprising a throttle structure for uniformizing a flow rate distribution between the pipe axis direction and the same fluid introduction path in the middle of the introduction path.

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