JPH037842B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) This invention relates to a tube burner equipped with a heat exchanger.

(Prior art) In a conventional tube burner with a heat exchanger, for example, as shown in FIG. However, in order to exchange heat between the combustion air that flows through this heat exchanger n and is supplied to the vicinity of the tip of the gas pipe t3 in the inner tube t2, and the exhaust gas that flows outside the inner tube t2 and is discharged. It was installed around the base end of the inner tube t2, and a shot pass hole p was provided near the tip of the inner tube t2 to allow the combustion gas to pass therethrough and to equalize the temperature distribution of the combustion gas.

(Problems to be Solved by the Invention) In the case of the above-mentioned tube burner, the effort required to install the heat exchanger n is complicated and increases the cost.
In addition, the heat transfer area of heat exchanger n is limited, and the exhaust gas passes through contact only with the inner circumferential surface n1 of heat exchanger n, and the heating temperature of combustion air is limited due to the small contact area. There was a problem in that the inner tube t2 was easily distorted by the dots and the shot pass hole p, and the durability of the inner tube deteriorated.

An object of the present invention is to provide a tube burner that can solve the above problems and improve combustion efficiency.

(Means for Solving the Problems) In the tube burner of the present invention, the vicinity of the inlet of the exhaust conduit for discharging exhaust gas to the outside is inserted into the vicinity of the outlet of the air conduit for supplying air. An inner cylinder connected to the inlet of the discharge pipe is inserted into the outer cylinder connected to the outlet of the pipe to form an air introduction path between the outer cylinder and the inner cylinder. death,
An air supply pipe having a gas supply pipe inserted therein is inserted into the inner cylinder, and a space between the inner cylinder and the air supply pipe is formed between the gas supply pipe and the air supply pipe. The air supply pipe forms an exhaust gas passage surrounding the air passage and is surrounded by the air introduction passage, and the air supply pipe is disposed in an outer burner pipe which is connected to the front of the outer cylinder in an abutting manner and has a closed end. An inner burner pipe connected to the inner burner pipe through a support ring is inserted into the exhaust gas passage, and the exhaust gas in the inner burner pipe is reversely flowed and introduced into the exhaust gas passage. A flow path for exhaust gas is formed in communication with the exhaust gas passage, and the air introduction passage and the air passage are communicated in the exhaust gas passage to transfer the heat of the exhaust gas flowing through the exhaust gas passage into the air supply pipe. A flexible tube is wound around the air supply pipe and has one end connected to the inner cylinder and the other end connected near the proximal end of the air supply pipe in order to conduct the combustion air to be sent. It has a structure in which a flexible heat exchange tube is inserted.

(Function) Air supplied through the air pipe is transferred to an air introduction passage formed between an outer cylinder connected to the outlet of the air pipe and an inner cylinder connected to the entrance of the discharge pipe. The air introduced into the inner cylinder and flowing through the air introduction passage is wound around an air supply pipe inserted into the inner cylinder and into which a gas supply cylinder is inserted, and the air is connected to the inner cylinder and the air supply pipe. Combustion air is introduced into the air supply pipe by flowing through a flexible heat exchange tube inserted into an exhaust gas passage formed between the inner cylinder and the air supply pipe and connected to the inner cylinder and the air supply pipe. supply Further, the exhaust gas of the gas combusted in the inner burner pipe connected to the tip of the air supply pipe is reversely flowed through a flow path formed around the inner burner pipe and introduced into the exhaust gas passage. It is discharged to the outside through the discharge pipe. When the exhaust gas flows through the exhaust gas passage, the heat of the exhaust gas is conducted to the combustion air flowing through the heat exchange tube to heat the combustion air supplied into the air supply pipe.

(Example) Next, an example in which the present invention is embodied in a single-end type radiant tube burner will be described with reference to the drawings.

In the vicinity of the outlet part 2a of the air conduit 2 that supplies air to the tube burner, the vicinity of the inlet part 4a of the exhaust conduit 4 that discharges exhaust gas to the outside is inserted, and is connected to the outlet part 2a of the air conduit 2. An inner cylinder 3 connected to the outlet 4a of the discharge pipe 4 is inserted concentrically into the outer cylinder 1, and an air introduction passage 20 through which air flows is formed between the outer cylinder 1 and the inner cylinder 3. In addition, the inner cylinder 3
An air supply pipe 5 is inserted concentrically into the interior with its tip protruding toward the front of the inner cylinder 3, and an exhaust pipe is formed between the air supply pipe 5 and the inner cylinder 3 by circulating exhaust gas. An exhaust gas channel 6 is formed for delivery into the channel 4 .

A gas supply pipe 7 inserted concentrically into the air supply pipe 5 and connected to the gas pipe line 8 is made of ceramic material and is formed into a round pipe shape. A spark rod 10 is inserted between the air supply pipe 5 and the gas supply pipe 7 to generate a spark and ignite the gas between the metal rod 9 fixed to the inner peripheral surface near the tip of the spark rod 10. An air passage 11 for supplying air to the vicinity of the tip of the gas supply pipe 7 is formed in the gas supply pipe 7 .

The swirler 12 causes the combustion air that flows through the air passage 11 and is supplied to the air supply port 5a at the tip of the air supply pipe 5 to flow through it, thereby generating a swirling flow that swirls around the axis of the air supply pipe 5. The swirler 12 is interposed between the vicinity of the tip of the air supply tube 5 and the vicinity of the tip of the gas supply tube 7 in order to A large number of curved blades 12a to 12a are arranged in the circumferential direction.

The outer burner tube 13 is attached to the tip of the outer cylinder 1 in abutting manner, and the tip is closed with a cover plate 13a.

A cylindrical inner burner tube 14 is arranged concentrically in parallel with the outer burner tube 13, and has an appropriate number of support rods 15 fixed to the outer circumferential surface of its base end and inscribed in the outer burner tube 14, and an air support rod 14. The supply pipe 5 is supported so as to be freely movable in the axial direction via a support ring 16 which is fixed to the outer peripheral surface near the tip of the supply pipe 5 and formed into a ring shape with an L-shaped cross section. is in contact with a pair of support plates 17, 17 which are installed in a ten-shape on the inner circumferential surface of the tip of the outer burner tube 13. The gas flowing through the gas supply pipe 7 is combusted within the inner burner pipe 14, and the combusted exhaust gas flows from the tip of the inner burner pipe 14 into the flow path 18 between the outer burner pipe 13 and the inner burner pipe 14. , further circulates in the exhaust gas passage 6 and is sent out into the exhaust pipe 4.

A flexible heat exchange tube 19 inserted into the exhaust gas passage 6 in order to transfer the heat of the exhaust gas flowing through the exhaust gas passage 6 to the combustion air fed into the air supply pipe 5 for heat exchange. is wound in a coil shape along the outer peripheral surface of the air supply tube 5, and its base end 19a is inscribed near the tip of the inner cylinder 3 in order to communicate the inside of the heat exchange tube 19 with the air pipe line 2. On the other hand, its distal end 19b is connected circumscribed to the vicinity of the base end of the air supply pipe 5 in order to feed the heat-exchanged combustion air into the air supply pipe 5. The proximal end 19a and the distal end 19 of
The portions other than b are held apart from the inner circumferential surface of the inner cylinder 2 and the outer circumferential surface of the air supply pipe 5, respectively. As the heat exchange tube 19, for example, a flexible tube formed into a pipe shape by winding a strip-shaped metal material in a spiral shape with a part of the metal material polymerized is applied.

Next, the operation and effects of the embodiment having the above configuration will be explained.

In this example, the outlet section 2 of the air pipe line 2 that supplies air
There is an exhaust pipe 4 near a that discharges exhaust gas to the outside.
The inner cylinder 3 connected to the inlet part 4a of the discharge pipe line 4 is inserted into the outer cylinder 1 connected to the outlet part 2a of the air pipe line 2, and the outer cylinder 1 and An air introduction path 20 is formed between the inner cylinder 3 and the inner cylinder 3.
The air supply pipe 5 with the gas supply pipe 7 inserted therein is inserted into the inner cylinder 3 and the air supply pipe 5 is formed between the gas supply pipe 7 and the air supply pipe 5. An exhaust gas passage 6 is formed which surrounds the air passage 11 and is surrounded by an air introduction passage 20, and air is contained in an outer burner pipe 13 which is connected to the front of the outer cylinder 1 in an abutting manner and whose tip is closed. An inner burner pipe 14 connected to the supply pipe 5 through a support ring 16 is inserted into the supply pipe 5, and the exhaust gas in the inner burner pipe 14 is reversely flowed around the inner burner pipe 14 to form an exhaust gas passage 6.
A flow path 18 for exhaust gas is formed which communicates with the exhaust gas passage 6 in order to introduce the air into the exhaust gas passage 6, and an air introduction passage 20 and an air passage 11 are connected to each other in the exhaust gas passage 6 to allow the air to flow through the exhaust gas passage 6. In order to conduct the heat of the exhaust gas to the combustion air fed into the air supply pipe 5, it is wound around the air supply pipe 5, and one end is connected to the inner cylinder 3, and the other end is connected to the air supply pipe 5. A flexible heat exchange tube 19 connected near the proximal end of the tube 5 is installed.

Therefore, it is possible to simplify the installation of the heat exchange tube 19 to the tube burner and reduce the installation effort, and it is also possible to expand the effective surface area of the heat exchange tube 19 and significantly expand the heat transfer area.
For example, compared to a conventional heat exchanger in which the air flow rate and flow path length are the same, the heat transfer area can be more than doubled.

Therefore, the heat of the exhaust gas can be effectively conducted to the heat exchange tube 19, and the combustion air flowing inside the heat exchange tube 19 can be effectively heated to increase the heating temperature of the combustion air. , for example, the combustion efficiency of a tube burner at a furnace temperature of 900℃,
The effect can be increased from about 60% in conventional tube burners to about 80% under the same conditions.

In addition, the combustion air heated to a high temperature is supplied to the air supply pipe 5.
The high-temperature air is supplied to the vicinity of the base end of the gas supply pipe 7, passes through the swirler 12, and is supplied to the air supply port 5a while swirling, so that the high-temperature air is evenly distributed around the vicinity of the tip of the gas supply pipe 7 and sent out. In addition, it is possible to improve the gas combustion state and make the temperature distribution inside the inner burner tube 14 uniform, and it is possible to eliminate the shot pass hole in the conventional tube burner and improve the durability performance of the inner tube tube 14. Even if the gas is supplied to the gas supply pipe 7 at low pressure, there is an effect that proper combustion state of the gas can be ensured.

Further, in this example, the inner burner pipe 14 has a support rod 15,
Since it is supported by the support ring 16 and the support plate 17 so as to be freely movable in the axial direction, it is possible to absorb the expansion and contraction behavior caused by the expansion and deformation of the inner burner pipe 14 and stabilize the supported state of the inner burner pipe 14. .

(Effects of the Invention) Since the present invention is configured as described above,
This has the effect of simplifying the installation of the heat exchange tube, expanding the heat transfer area of the heat exchange tube, effectively heating the combustion air, and increasing the combustion efficiency of gas fuel.

In particular, all the pipes through which the air flows are in contact with the exhaust gas, and the combustion air is constantly heated as it circulates and is supplied to the tip of the gas supply pipe. Since the exhaust gas flows in contact with the combustion air, the heat of the exhaust gas is effectively transferred to the air, and the heat transfer characteristics to the combustion air can be significantly improved.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, where Figure 1 is a longitudinal sectional view of a tube burner, Figure 2 is a sectional view taken along the line X1-X1 in Figure 1, and Figure 3 is the same. A view taken along the line X2-X2 and FIG. 4 are longitudinal cross-sectional views of a conventional tube burner. 5...Air supply pipe, 6...Exhaust gas passage, 19...
...Heat exchange tube.

Claims (1)

[Claims] 1. Insert the vicinity of the inlet of an exhaust conduit for discharging exhaust gas to the outside into the vicinity of the outlet of the air conduit that supplies air, and insert the An air introduction path is formed between the outer cylinder and the inner cylinder by inserting an inner cylinder connected to the inlet of the discharge pipe, and a gas supply pipe is inserted into the inner cylinder. An air supply pipe is inserted between the inner cylinder and the air supply pipe to surround an air passage formed between the gas supply pipe and the air supply pipe, and to surround the air passage formed between the gas supply pipe and the air supply pipe. An inner burner is connected to the front of the air supply pipe via a support ring in an outer burner pipe that forms an enclosed exhaust gas passage and is connected to the front of the outer cylinder in an abutting manner and whose tip is closed. A tube is inserted to form an exhaust gas flow path around the inner burner tube that communicates with the exhaust gas passage in order to reversely flow the exhaust gas in the inner burner tube and introduce it into the exhaust gas passage; ,
The air supply is provided in the exhaust gas passage in order to communicate the air introduction passage and the air passage and conduct the heat of the exhaust gas flowing through the exhaust gas passage to the combustion air fed into the air supply pipe. A flexible heat exchange tube is wound around the tube and has one end connected to the inner tube and the other end connected near the proximal end of the air supply tube. Chubvarna.