JP2008209058A - Heat exchange burner - Google Patents

Abstract

To provide a heat exchange burner capable of sufficiently performing convective heat transfer of combustion exhaust gas and improving exhaust heat recovery efficiency of combustion exhaust gas.
A heat exchange burner (1) includes a burner body (2) in which a cylindrical partition wall (22) is formed on an inner peripheral side of a cylindrical housing (21) provided with an intake port (23) and an exhaust port (24), and an inner periphery of the partition wall (22). It has a heat transfer tube 4 inserted and arranged on the side, and a gas pipe 3 inserted and arranged on the inner peripheral side of the heat transfer tube 4. The heat exchange burner 1 passes the combustion air A taken in from the intake port 23 through the outer intake passage 101 and the inner intake passage 102 and burns it together with the fuel F injected from the gas pipe 3, and combustion exhaust gas G2 Is passed through the exhaust passage 103 and guided to the exhaust port 24. In the exhaust passage 103, there is provided a heat exchange promoting member 5 having a spiral shape and for turning and passing the combustion exhaust gas G2.
[Selection] Figure 1

Description

  The present invention relates to a heat exchange burner used for heating the inside of a heating furnace or the like.

  When heating the inside of various heating furnaces, various gas burners (heat exchange burners) that perform combustion using exhaust heat of exhaust gas are used. For example, in Patent Document 1, a single-end type radiant tube burner is formed by attaching an inner tube and an outer tube to a burner body in which a cylindrical partition and a gas pipe are provided in a cylindrical housing. And the exhaust heat of combustion exhaust gas is collect | recovered by heating the combustion air which passes the inner peripheral side of an inner tube with the combustion exhaust gas which passes the outer peripheral side of an inner tube. Further, by providing a plurality of heat transfer fins on the outer peripheral side of the inner tube, the exhaust heat recovery efficiency is improved.

  However, the radiant tube burner of Patent Document 1 is not sufficient to further improve the exhaust heat recovery efficiency. That is, in patent document 1, although the area which heat-exchanges with a heat-transfer fin increases, combustion exhaust gas will pass through the clearance gap between each heat-transfer fin linearly. Therefore, the flow of the combustion exhaust gas may be biased in the circumferential direction of the inner tube, and the convective heat transfer of the combustion exhaust gas may not be sufficiently performed with respect to the inner tube and each heat transfer fin.

JP 2006-29638 A

  The present invention has been made in view of such conventional problems, and provides a heat exchange burner capable of sufficiently performing convective heat transfer of combustion exhaust gas and improving exhaust heat recovery efficiency of combustion exhaust gas. It is something to be offered.

The present invention includes a burner body formed with a cylindrical partition wall on the inner peripheral side of a cylindrical housing provided with an intake port and an exhaust port, a heat transfer tube inserted and arranged on the inner peripheral side of the partition wall, A gas pipe inserted and arranged on the inner peripheral side of the heat transfer tube,
After the combustion air taken in from the intake port passes through the outside intake passage formed between the housing and the partition wall, the heat transfer tube, the gas pipe, and the like are connected from one end side of the heat transfer tube. And is combusted together with the fuel injected from the gas pipe and the combustion exhaust gas after the combustion is conducted from the other end side of the heat transfer tube. In the heat exchange burner configured to pass through the exhaust passage formed between the tube and the partition wall and lead to the exhaust port,
A heat exchange burner is provided in the exhaust passage, wherein the heat exchange burner has a spiral shape and is provided with a heat exchange accelerating member for turning and passing the combustion exhaust gas.

The heat exchange burner of the present invention is a combustion exhaust gas that passes through the exhaust passage by providing a heat exchange promoting member having a helical shape in the exhaust passage formed between the heat transfer tube and the partition wall. To improve the exhaust heat recovery efficiency of the combustion exhaust gas.
In the heat exchange burner of the present invention, combustion is performed between the fuel ejected from the gas pipe and the combustion air that is sucked from the intake port, passes through the outer intake passage and the inner intake passage, and is ejected from the heat transfer tube. Then, the inside of the heating furnace is heated. Next, the heated combustion exhaust gas passes through the exhaust passage and is exhausted from the exhaust port to the outside of the heat exchange burner.

  When the combustion exhaust gas passes through the exhaust passage, the combustion exhaust gas exchanges heat with the combustion air flowing in the heat transfer tube using the heat transfer tube as a heat transfer surface, and the temperature of the combustion air Can be raised. At this time, the combustion exhaust gas passing through the exhaust passage can be swirled by the helical heat exchange promoting member provided in the exhaust passage. Thereby, not only can the heat transfer area of the heat transfer tube be increased by the heat exchange promoting member, but also the convective heat transfer of the combustion exhaust gas to the heat transfer tube can be sufficiently performed. Further, the heat exchange promoting member can prevent the combustion exhaust gas from being biased in the circumferential direction of the heat transfer tube.

  Therefore, according to the heat exchange burner of the present invention, the convective heat transfer of the combustion exhaust gas can be sufficiently performed, and the exhaust heat recovery efficiency of the combustion exhaust gas can be improved.

A preferred embodiment of the present invention described above will be described.
In the present invention, the other end of the heat transfer tube projects into the heating furnace, and the inner intake passage and the exhaust passage communicate with the heating furnace. In this case, the inside of the heating furnace can be directly heated by the combustion gas burned in the heat exchange burner. Then, the heated combustion exhaust gas can be exhausted from the heating furnace to the exhaust port via the exhaust passage.

  An outer tube that covers the outer peripheral side of the heat transfer tube is connected to the other end side of the burner body, and the exhaust passage is continuously formed between the heat transfer tube and the outer tube. (Claim 3). In this case, the inside of the heating furnace can be indirectly heated through the outer tube by the combustion gas burned in the heat exchange burner. And the combustion exhaust gas after a heating can be exhausted to an exhaust port via the inside of the exhaust passage formed between a heat exchanger tube and an outer tube, and between a heat exchanger tube and a partition.

  The heat exchange promoting member is preferably formed by a coil spring. In this case, the heat exchange promoting member can be easily formed using the helical shape of the coil spring. Moreover, the durability of the heat exchange promoting member can be easily improved by using a coil spring made of a material having excellent durability. Further, the coil spring can be flexibly deformed against thermal expansion and contraction, and the heat exchange promoting member can be prevented from being damaged due to thermal deformation.

  The coil spring is preferably attached to the outer peripheral surface of the heat transfer tube in a state in which the heat transfer tube is prevented from coming off. In this case, since the whole coil spring is not fixed to the heat transfer tube, it can be deformed more flexibly against thermal expansion and contraction.

  Further, the inner intake passage may be provided with an inner heat exchange promoting member having a helical shape and for allowing the combustion air to swirl and pass therethrough. In this case, the combustion air passing through the inner intake passage can be swirled by the inner heat exchange promoting member. As a result, heat exchange between the combustion exhaust gas with the heat transfer tube as the heat transfer surface and the combustion air can be further promoted, and the exhaust heat recovery efficiency of the combustion exhaust gas can be further improved.

  The inner heat exchange promoting member is preferably formed by a coil spring. In this case, the inner heat exchange promoting member can be easily formed using the helical shape of the coil spring. Further, the durability of the inner heat exchange promoting member can be easily improved by using a coil spring made of a material having excellent durability. Further, the coil spring can be flexibly deformed against thermal expansion and contraction, and the inner heat exchange promoting member can be prevented from being damaged by thermal deformation.

Hereinafter, embodiments of the heat exchange burner of the present invention will be described with reference to the drawings.
(Example 1)
As shown in FIGS. 1 to 3, the heat exchange burner 1 of this example is a burner body in which a cylindrical partition wall 22 is formed on the inner peripheral side of a cylindrical housing 21 provided with an intake port 23 and an exhaust port 24. 2, a heat transfer tube 4 inserted and arranged on the inner peripheral side of the partition wall 22, and a gas pipe 3 inserted and arranged on the inner peripheral side of the heat transfer tube 4.

  The heat exchange burner 1 allows the combustion air A taken in from the intake port 23 to pass through the outside intake passage 101 formed between the housing 21 and the partition wall 22, and then from one end side of the heat transfer tube 4. Combustion exhaust gas G2 after passing through the inside intake passage 102 formed between the heat transfer tube 4 and the gas pipe 3 and burning together with the fuel (fuel gas) F injected from the gas pipe 3 and burning. Is passed through the exhaust passage 103 formed between the heat transfer tube 4 and the partition wall 22 from the other end side of the heat transfer tube 4 and led to the exhaust port 24. In the exhaust passage 103, there is provided a heat exchange promoting member 5 having a spiral shape and for turning and passing the combustion exhaust gas G2 (see FIG. 3).

  1 is a view showing a cross section of the heat exchange burner 1, FIG. 2 is a view showing the periphery of the intake port 23, and FIG. 3 is a view showing the periphery of the exhaust port 24. In FIG. 1, the flow of combustion air A, combustion exhaust gas G2, etc. is indicated by solid arrows, and the heat flow in the heat transfer tube 4 is indicated by broken arrows. Moreover, in this example, the one end side means the outer wall side of the heating furnace 7, and the other end side means the opposite side to the one end side.

Below, it demonstrates in full detail with FIGS. 1-5 about the heat exchange burner 1 of this example.
As shown in FIG. 1, the heat exchange burner 1 of this example is a radiant tube burner that indirectly heats the inside of the heating furnace 7 by radiant heat. An outer tube 6 that covers the outer peripheral side of the heat transfer tube (inner tube) 4 is connected to the other end side of the burner body 2. The exhaust passage 103 is also formed continuously between the heat transfer tube 4 and the partition wall 22 and between the heat transfer tube 4 and the outer tube 6.
The burner body 2 and the outer tube 6 are attached to the outer wall of the heating furnace 7 in a state where the distal end portion (the other end side) of the outer tube 6 protrudes into the heating furnace 7.

In the burner body 2, an intake port 23 is provided on the side close to the heating furnace 7, and an exhaust port 24 is provided on the side far from the heating furnace 7.
The heat transfer tube 4 is provided in the heat exchange burner 1 with a flange portion formed on the rear end side (one end side) attached to the rear end portion of the partition wall 22. The outer tube 6 is attached to the outer wall of the heating furnace 7 by a flange portion formed on the rear end side (one end side). Further, the outer intake passage 101 and the inner intake passage 102 communicate with each other on the rear end side (one end side) of the heat transfer tube 4.

As shown in FIG. 1, the heat exchange promoting member 5 of this example is formed by using a coil spring 5 formed by winding a steel wire excellent in durability into a spiral shape. The coil spring 5 can be flexibly deformed against thermal expansion and contraction, and the heat exchange promoting member 5 can be prevented from being damaged by thermal deformation.
The coil spring 5 of this example is formed using a round wire having a circular cross section, but may be formed using a square wire having a substantially square cross section. The coil spring 5 can be formed from various heat-resistant metals, ceramics and the like.
Moreover, the coil spring 5 can use what is marketed, and the heat exchange acceleration | stimulation member 5 which consists of a coil spring 5 can be easily extended with respect to the heat exchanger tube 4 in the existing heat exchange burner 1. FIG. it can.

As shown in the figure, a gas nozzle 31 is provided at the distal end (the other end side) of the gas pipe 3, and a spark plug 32 is inserted and arranged on the inner peripheral side of the gas pipe 3. In a state where the heat exchange burner 1 is attached to the heating furnace 7, the tip of the gas nozzle 31 is located near the inner wall surface of the heating furnace 7.
The coil spring 5 constituting the heat exchange promoting member 5 is attached to a portion corresponding to the outer peripheral side of the gas pipe 3 on the outer peripheral surface of the heat transfer tube 4.

  In addition, the coil spring 5 is attached to the outer peripheral surface of the heat transfer tube 4 in a state in which the heat transfer tube 4 is prevented from coming off. The coil spring 5 is in contact with the heat transfer tube 4 on the inner peripheral side and forms a gap between the outer peripheral side and the partition wall 22. As a result, the coil spring 5 and the heat transfer tube 4 come into contact with each other and heat conduction between them can be facilitated. On the other hand, due to the gap between the coil spring 5 and the partition wall 22, the heat exchange burner 1 Easy to assemble and disassemble.

  The coil spring 5 can be attached to the outer peripheral surface of the heat transfer tube 4 by shrink fitting (after being heated and expanded). In addition, the coil spring 5 is prevented from coming off from the heat transfer tube 4 by a slip-out preventing projection 41 provided on the outer peripheral surface of the heat transfer tube 4 on the rear end side (one end side). Side) is not fixed. And since the front end side of the coil spring 5 is not fixed, the thermal deformation of the coil spring 5 can be made easier.

  Note that, as shown in FIG. 4, the heat exchange promoting member 5 can integrally form a winding-shaped protrusion 42 on the outer peripheral surface of the heat transfer tube 4 by casting or the like. Further, as shown in FIG. 5, the heat exchange promoting member 5 can be formed integrally with the heat transfer tube 4 by welding the suspended heat transfer fins 43 to the outer peripheral surface of the heat transfer tube 4. .

  In the heat exchange burner 1 of this example, as shown in FIGS. 1 and 2, the fuel F ejected from the gas nozzle 31 of the gas pipe 3 and the intake air 23 are sucked and pass through the outer intake passage 101 and the inner intake passage 102. Then, combustion with the combustion air A ejected from the front end side (the other end side) of the heat transfer tube 4 is performed. Using the thermal energy of the combustion gas G1, indirect heating in the heating furnace 7 or the like is performed by thermal radiation through the outer tube 6. Next, the heated combustion exhaust gas G2 passes through the exhaust passage 103 formed between the heat transfer tube 4 and the outer tube 6 and between the heat transfer tube 4 and the partition wall 22, and the exhaust port 24 is exhausted. To the outside of the heat exchange burner 1.

  1 and 3, when the combustion exhaust gas G2 passes through the exhaust passage 103, the combustion exhaust gas G2 is combusted through the heat transfer tube 4 with the heat transfer tube 4 as a heat transfer surface. The temperature of the combustion air A can be increased by exchanging heat with the combustion air A. At this time, the combustion exhaust gas G <b> 2 passing through the exhaust passage 103 can be swirled by the helical heat exchange promoting member (coil spring) 5 provided in the exhaust passage 103. Thereby, not only can the heat transfer area of the heat transfer tube 4 be increased by the heat exchange promoting member 5, but also the convective heat transfer of the combustion exhaust gas G2 to the heat transfer tube 4 can be sufficiently performed. Further, the heat exchange promoting member 5 can prevent the flow of the combustion exhaust gas G2 from being biased in the circumferential direction of the heat transfer tube 4.

  Therefore, according to the heat exchange burner 1 of this example, the convective heat transfer of the combustion exhaust gas G2 can be sufficiently performed, and the exhaust heat recovery efficiency of the combustion exhaust gas G2 can be improved.

  Further, as shown in FIG. 6, the inner intake passage 102 can be provided with an inner heat exchange promoting member 55 having a spiral shape and for allowing the combustion air A to swirl and pass therethrough. The inner heat exchange promoting member 55 can be formed of a coil spring as with the heat exchange promoting member 5. The coil spring constituting the inner heat exchange promoting member 55 is mounted on the inner peripheral surface of the heat transfer tube 4. The combustion heat A passing through the inner intake passage 102 can be swirled by the inner heat exchange promoting member 55. Thereby, the heat exchange between the combustion exhaust gas G2 and the combustion air A with the heat transfer tube 4 as the heat transfer surface can be further promoted, and the exhaust heat recovery efficiency of the combustion exhaust gas G2 can be further improved. .

(Example 2)
In this example, the heat exchange promoting member 5 is applied to a heat exchange burner 1A that directly heats the inside of the heating furnace 7 with a combustion flame.
As shown in FIG. 7, the outer tube 6 is not used in the heat exchange burner 1 </ b> A of this example, and the heat exchange burner 1 </ b> A of this example uses a heating furnace with the tip end side (the other end side) of the heat transfer tube 4. 7 is attached to the outer wall of the heating furnace 7 so as to protrude into the inside. An attachment member 65 in place of the outer tube 6 is provided in the burner attachment port 71 provided in the heating furnace 7. In addition, the inner intake passage 102 and the exhaust passage 103 in this example communicate with the inside of the heating furnace 7.

In the heat exchange burner 1A of this example, the inside of the heating furnace 7 is directly heated by the combustion gas G1 obtained by burning the fuel F ejected from the gas nozzle 31 and the combustion air A ejected from the heat transfer tube 4. The heated combustion exhaust gas G2 passes through the exhaust passage 103 formed between the heat transfer tube 4 and the mounting member 65, and between the heat transfer tube 4 and the partition wall 22, and the exhaust port 24. To the outside of the heat exchange burner 1A.
Also in this example, other configurations are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained.

Sectional explanatory drawing which shows the heat exchange burner in Example 1. FIG. It is a figure which shows the heat exchange burner in Example 1, and is AA sectional view explanatory drawing in FIG. It is a figure which shows the heat exchange burner in Example 1, and is BB arrow directional cross-sectional explanatory drawing in FIG. Explanatory drawing which shows the other heat exchanger tube which provided the heat exchange promotion member in Example 1. FIG. Explanatory drawing which shows the other heat exchanger tube which provided the heat exchange promotion member in Example 1. FIG. Sectional explanatory drawing which shows the other heat exchange burner in Example 1. FIG. Sectional explanatory drawing which shows the heat exchange burner in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat exchange burner 101 Outer intake passage 102 Inner intake passage 103 Exhaust passage 2 Burner body 21 Housing 22 Bulkhead 23 Intake port 24 Exhaust port 3 Gas pipe 31 Gas nozzle 4 Heat transfer tube 5 Heat exchange promotion member (coil spring)
55 Inner heat exchange promotion member (coil spring)
6 Outer tube 7 Heating furnace A Combustion air F Fuel G1 Combustion gas G2 Combustion exhaust gas

Claims (7)

A burner body formed with a cylindrical partition wall on the inner peripheral side of a cylindrical housing provided with an intake port and an exhaust port, a heat transfer tube inserted and arranged on the inner peripheral side of the partition wall, and the heat transfer tube A gas pipe inserted and arranged on the inner peripheral side,
After the combustion air taken in from the intake port passes through the outside intake passage formed between the housing and the partition wall, the heat transfer tube, the gas pipe, and the like are connected from one end side of the heat transfer tube. And is combusted together with the fuel injected from the gas pipe and the combustion exhaust gas after the combustion is conducted from the other end side of the heat transfer tube. In the heat exchange burner configured to pass through the exhaust passage formed between the tube and the partition wall and lead to the exhaust port,
A heat exchange burner having a helical shape in the exhaust passage and provided with a heat exchange promoting member for swirling and passing the combustion exhaust gas. In claim 1, the other end side of the heat transfer tube protrudes into the heating furnace,
The heat exchange burner characterized in that the inner intake passage and the exhaust passage communicate with the inside of the heating furnace. In Claim 1, the outer tube which covers the perimeter side of the heat transfer tube is connected to the other end side of the burner body,
The heat exchange burner, wherein the exhaust passage is also formed continuously between the heat transfer tube and the outer tube.   The heat exchange burner according to claim 1, wherein the heat exchange promoting member is formed by a coil spring.   5. The heat exchange burner according to claim 4, wherein the coil spring is mounted on the outer peripheral surface of the heat transfer tube in a state in which the coil spring is prevented from coming off.   The inner heat exchange promoting member according to any one of claims 1 to 5, wherein the inner intake passage has a spiral shape and is provided with an inner heat exchange promoting member for swirling and passing the combustion air. Heat exchange burner.   7. The heat exchange burner according to claim 6, wherein the inner heat exchange promoting member is formed by a coil spring.

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