JPH09280547A - Combustor for industrial furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of a changeover valve and not limit the design of a burner by improving the efficiency of waste heat recovery of an industrial furnace likewise a regeneration burner, and providing a rotary heat storage unit independently of a burner. SOLUTION: A burner 5 is adapted such that a primary air nozzle 2 is provided on an outer periphery of a fuel nozzle 1 and a primary combustion port is formed in a baffle 3 provided on the tip end of the nozzle 2. The burner 5 is constructed by uniformly disposing a plurality of combustion air nozzles 6 around the primary combustion port of the baffle 3 and uniformly disposing a plurality of waste gas suction holes 7 outside the combustion air nozzle 6. In contrtast, a rotary heat storage unit 8 is disposed in the vicinity of the burner 5 and outside the furnace, and a combustion air passage 9 of the rotary heat storage unit 8 and the combustion air nozzle 6 of the burner 6, and a waste gas passage 10 of the rotary heat storagte unit 8 and the waste gas suction holes 7 of the burner 5 are connected with each other, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus which is effective in saving energy by recovering sensible heat of exhaust gas by high-temperature preheating of combustion air.

[0002]

2. Description of the Related Art Conventionally, in industrial furnaces such as heating furnaces, heat treatment furnaces, smelting furnaces, incinerators, etc., a combustion device for improving the thermal efficiency of the furnace is used as a means for preheating the combustion air at high temperature by sensible heat of exhaust gas. A regenerative burner (hereinafter referred to as a regenerative burner) is used which alternately performs exhaust and combustion, recovers heat by a heat storage body stored in a regenerator during exhaust, and preheats combustion air during combustion. Since the regenerative burner alternately burns combustion and exhaust gas, a switching valve is required for each of the fuel pipe, the combustion air pipe, and the exhaust gas pipe.
Further, in an industrial furnace equipped with a regenerative burner, combustion is performed in pairs, so that the capacity or number of burners is doubled.

Therefore, as a means for solving the problem, Japanese Patent Publication No. 6-
The heat recovery combustion device described in 56261 has been proposed.

[0004]

FIG. 7 shows a Japanese Patent Publication No. 6-56.
It is the figure which showed the structure of the combustion device of 261. The configuration of this heat recovery type combustion device is such that the combustion air passage 40, which is disposed near the burner attached to the furnace wall, and through which the combustion air flows, and the exhaust gas after combustion is discharged to the outside of the furnace. The exhaust gas passage 42 and the exhaust gas passage 42 can rotate between the exhaust gas passage 42 and the combustion air passage 40 so as to heat the combustion air flowing in the combustion air passage 40 by the heat of the exhaust gas flowing in the exhaust gas passage 42. And a heat storage body 41 having a large number of vent holes provided in
A partition plate 4 is provided inside the furnace wall 34 at the opening.
The air passage 40 and the exhaust gas passage 4 are separated by partitioning into 3
The one duct 44 forming the 2 is connected, and the duct 4
The heat storage body 41 is arranged in a cylindrical portion of the furnace inner end portion of No. 4 which does not have the partition plate 43.

In this heat recovery type combustion apparatus, the problem of the regenerative burner, that is, the structure of the regenerative burner is constituted by a set of two because the combustion of the regenerative burner is the alternating combustion of combustion and exhaust, and each burner has Since it has a regenerator in the immediate vicinity and is equipped with an automatic switching valve in the fuel piping, combustion air piping, and exhaust gas piping, the problem of needing an automatic switching valve that doubles the number or capacity of burners is solved. But
There are the following issues.

(1) Direct heat storage 35 on the furnace wall 34 of the industrial furnace
Since the opening of the furnace wall 34 depends on the size of the heat storage device 35, the size of the burner tile 36 increases, and thus the working range of the burner tile 36 increases. Therefore, the size of the furnace is restricted by the size of the burner tile 36, and the furnace 37 cannot be made compact.

(2) As shown in FIG. 7, the structure of the combustion device is composed of a fuel nozzle 38 and a heat storage device 35, and the heat storage device 35 is directly connected to the inside of the furnace. The heat accumulator 3 without reducing the area of the hole 39.
The size of the combustion air passage 40 is 5, the jet speed of the combustion air is slow, the flame becomes short, and the NOx value becomes high. Further, since the fuel nozzle 38 is separated from the combustion air ejection hole 39, the flame may be blown out under the condition that the combustibility is deteriorated when the temperature inside the furnace at the time of starting the furnace is low.

(3) The combustion air passage 40 in the regenerator 35 increases the ejection speed of the combustion air into the furnace, so that the combustion air passage 40 is narrow (the passage of the combustion air is 1/8 of the total area).
.About.1 / 2.5), the heat storage body 41 has different time periods for the combustion air and the exhaust gas, and the heat recovery rate deteriorates.

(4) Since a ceramic honeycomb is used for the heat storage body 41, it is relatively weak against thermal stress and easily cracked.

(5) Combustion air passage 40, exhaust gas passage 42
Is directly connected to the heat accumulator 35, so that a nonuniform flow occurs in the passage and directly passes through the heat storage body 41. Therefore, the heat storage body 41
Need to be longer than necessary.

[0011]

In order to solve the above problems, the present invention has the following structure.

(1) A burner in which a primary air nozzle is provided on the outer circumference of a fuel nozzle, and a primary combustion port is formed in a baffle provided at the tip of the nozzle, the primary burner of the baffle. A plurality of combustion air nozzles are evenly arranged around the combustion port, and a plurality of exhaust gas suction holes are evenly arranged outside the combustion air nozzle to form a burner, while
A rotary heat storage device is installed near the burner and outside the furnace, and a combustion air passage of the rotary heat storage device and a combustion air nozzle of the burner are provided, and an exhaust gas passage of the rotary heat storage device and an exhaust gas suction hole of the burner are provided. Are connected respectively.

(2) In the combustion apparatus for an industrial furnace as set forth in claim 1, a heat storage body rotatable around a shaft center by a drive unit is provided in the cylindrical tube, and a large number of small-diameter tubes are arranged in the same direction as the shaft center. To form a buffer part having a constant space at both ends of the heat storage body, and each of the buffer parts is divided into two in the same direction as the axis of the cylindrical part, one of which is an exhaust gas buffer. The chamber and the other are used as the combustion air buffer chamber, and the exhaust gas buffer chamber is connected to the exhaust gas passage and the combustion air buffer chamber is connected to the combustion air passage to form a rotary heat accumulator.

From (1) and (2), therefore, since the rotary heat storage device is independent from the furnace, the burner tile portion can be freely processed.

Since the combustion air passage cross-section and the exhaust gas passage cross-section in the rotary heat storage device can be made equal, the passage times of the combustion air and exhaust gas heat storage bodies are equal, and the combustion air preheat of exhaust gas sensible heat is equal. The heat recovery rate is good.

An independent small-diameter tube is used for the heat storage body, and when combustion air and exhaust gas pass through the heat storage body, they receive thermal stress such as temperature rise and cooling. Therefore, since the gap between the small diameter pipes serves as an expansion allowance at the time of heating, it is strong against this thermal stress,
Further, even if a part is damaged, only that part can be replaced.

Combustion air buffer chambers and exhaust gas buffer chambers are also provided at both ends of the heat storage body in the cylindrical tube, respectively, to form a sudden expansion portion as compared with the combustion air passages and exhaust gas passages. Therefore, since the combustion air and the exhaust gas that have flowed in from the combustion air passage and the exhaust gas passage can be temporarily received by the buffer chamber and the pressures before and after the heat storage body can be equalized, a non-uniform flow does not occur. Also, passing through the heat storage body, the combustion air passage,
The same can be said when flowing into the exhaust gas passage.

Since the burner portion can be designed independently, the jetting speed of the combustion air can be freely designed, and the jetting speed can be increased to increase the amount of the exhaust gas entrained in the furnace to prolong the flame. Low NOx can be achieved.

By installing a primary combustion port, which is a flame stabilizer, at the tip of the burner, the amount of primary air is increased when the burnability of the burner is poor because the furnace temperature is low. When the combustibility is improved and the combustibility of the burner is improved, such as when the furnace temperature is high, the amount of primary air is reduced and the amount of secondary air is increased to increase the heat recovery amount of exhaust gas sensible heat. Aim to reduce the value.

Primary combustion air and secondary combustion air ejection holes are evenly arranged around the fuel ejection holes to keep the flame in a good shape.

By eliminating the burner tile structure, it is possible to increase the amount of exhaust gas entrained as compared with the case where there is a normal burner tile, and it is possible to achieve low NOx properties and flame extension.

(3) A burner having a primary air nozzle provided on the outer periphery of the fuel nozzle and a primary combustion port formed on a baffle provided at the tip of the nozzle is provided at predetermined intervals on the furnace wall. A plurality of small-diameter tubes are formed in the same direction as the axis to fill the inside of a cylindrical tube installed outside the furnace with a heat storage body rotatable about the axis by a drive device. , A buffer part having a constant space is formed at both ends of the heat storage body, and each of the buffer parts is divided into two in the same direction as the axis of the cylindrical pipe, one of which is an exhaust gas buffer chamber and the other is a combustion air buffer chamber. Further, an exhaust gas passage is connected to the exhaust gas buffer chamber, and a combustion air passage is connected to the combustion gas buffer chamber to form a rotary heat storage device, and the rotary heat storage device is disposed between the burners. Exhaust gas passage located on the furnace side of the regenerator And combustion air passage and forms as occupying passed, communicating with each furnace via an exhaust gas suction hole and the combustion air nozzle is formed in a furnace wall.

(4) In the combustion apparatus for an industrial furnace according to claim 3, an exhaust gas suction hole is provided in the furnace wall between the burner and the burner, and at least combustion air nozzles are provided on both sides of the suction hole. At least two combustion air passages, which are located on the furnace side of the rotary heat accumulator, are formed, and two combustion air passages are formed so as to communicate with the inside of the furnace through the combustion air nozzles.

From (3) and (4), therefore, since the rotary heat storage device is independent from the furnace, the burner tile portion can be freely processed.

Since the combustion air passage cross-sectional area and the exhaust gas passage cross-sectional area in the rotary heat storage device can be made equal, the passage times of the combustion air and the exhaust gas through the heat storage bodies are equal, and the combustion air preheating of the exhaust gas sensible heat is performed. The heat recovery rate is good.

An independent small-diameter tube is used as the heat storage body, and when combustion air and exhaust gas pass through the heat storage body, they receive thermal stress such as temperature rise and cooling. Therefore, since the gap between the small diameter pipes serves as an expansion allowance at the time of heating, it is strong against this thermal stress,
Further, even if a part is damaged, only that part can be replaced.

Combustion air buffer chambers and exhaust gas buffer chambers are also provided at both ends of the heat storage body in the cylindrical tube, respectively, to form a sudden expansion portion as compared with the combustion air passages and exhaust gas passages. Therefore, since the combustion air and the exhaust gas that have flowed in from the combustion air passage and the exhaust gas passage can be temporarily received by the buffer chamber and the pressures before and after the heat storage body can be equalized, a non-uniform flow does not occur. Also, passing through the heat storage body, the combustion air passage,
The same can be said when flowing into the exhaust gas passage.

Since the combustion air nozzle can be designed independently, it is possible to freely design the ejection speed of the combustion air, and by increasing the ejection speed, the amount of the exhaust gas entrained in the furnace is increased to prolong the flame. Therefore, it is possible to reduce NOx.

By installing a primary combustion port, which is a flame stabilizer, at the tip of the burner, the amount of primary air is increased when the burnability of the burner is poor because the furnace temperature is low. When the combustibility is improved and the combustibility of the burner is improved, such as when the furnace temperature is high, the amount of primary air is reduced and the amount of secondary air is increased to increase the heat recovery amount of exhaust gas sensible heat. Aim to reduce the value.

By eliminating the burner tile structure, it is possible to increase the amount of exhaust gas entrained as compared with the case where there is a normal burner tile, and it is possible to achieve low NOx properties and flame extension.

Since one rotary heat storage device is installed for every two burners, the number of rotary heat storage devices can be reduced to half.

[0032]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in detail based on embodiments with reference to the drawings.

FIG. 1 is a schematic view of a combustion apparatus according to claim 1,
FIG. 2 is a schematic diagram of a rotary heat storage device 8 according to an embodiment of the present invention.
3 is an industrial furnace according to claims 3 and 4, and FIGS. 4, 5 and 6 are shown in FIG.
FIG.

FIG. 1 shows a vertical sectional view of a combustion apparatus equipped with a rotary heat storage device 8 and a front view as seen from the inside of the furnace, and the first embodiment will be described. The burner 5 has a structure in which a fuel nozzle 1 is arranged at the center of the burner 5, and a primary air nozzle 2 is arranged around the fuel nozzle 1 so that the fuel nozzle 1 does not reach a high temperature due to sensible heat of combustion air. Further, a baffle 3 provided at the tip of the primary air nozzle 2, that is, a primary combustion port 4 for maintaining the primary combustion flame is arranged inside the furnace.
Further, in this embodiment, four combustion air nozzles 6 are evenly arranged around the primary combustion port 4 with the burner 5 axis as the center. Therefore, the combustion air nozzle 6 can be provided at any position and in any number depending on the shape of the baffle 3. The exhaust gas suction hole 7 is provided on the outermost side, that is, outside the combustion air nozzle 6 so as not to interfere with combustion.
Place a plurality of. Further, the rotary heat storage device 8 is arranged in the vicinity of the burner 5 and outside the furnace, and the combustion air passage 9 of the rotary heat storage device 8 and the combustion air nozzle 6 of the burner 5 are connected by a pipe made of a refractory material. Further, the exhaust gas passage 10 of the rotary heat storage device 8 and the exhaust gas suction hole 7 of the burner 5 are also connected by a pipe made of a refractory material.

The combustion feature of the burner 5 is that the combustion air nozzle 6 is arranged around the fuel nozzle 1 so that the flame shape is not biased and good combustion is achieved. In addition, since the primary air is blown into the immediate vicinity of the fuel and the primary combustion port 4 is installed at the same time, the cause of deterioration of the combustibility such as when the temperature inside the furnace is low (= the combustion air temperature is low) may occur. In some cases, good flammability can be maintained. Further, by using room temperature air as the primary air, it also serves as protection of the metal parts of the fuel nozzle 1. Furthermore, by adjusting the amount of primary air blown in, it becomes possible to prevent the rise of flame when the burner 5 is under a low load. In addition, by installing the rotary heat storage device 8 outside the furnace in the vicinity of the burner 5 in this manner, while performing highly efficient waste heat recovery comparable to the regenerative burner, unlike the regenerative burner, all burners burn, Fuel switching valve, combustion air switching valve, exhaust gas switching valve are not required. Further, by installing the exhaust gas suction hole 7 in the vicinity of the burner 5, it is possible to increase the amount of exhaust gas entrained in combustion and achieve low NOx.

Next, the rotary heat storage device 8 in this embodiment will be described in detail with reference to the drawings. In this rotary type heat storage device 8, a heat storage body 25 is provided in a central portion inside the cylindrical tube 11. This heat storage body 25 has an axis 1 about the axis 17.
It is composed of a small diameter tube 12 filled in the same direction as 7, and is freely rotated in the cylindrical tube 11 by a drive device 24 attached to the end of the shaft center 17. FIG. 4 shows the heat storage body 17.
FIG. 3 is a cross-sectional view showing the state of the inner wall of the cylindrical tube 11 as seen from above the rotary heat storage device 8. As shown, the heat storage body 25 has irregularities with respect to the cylindrical tube 11. Therefore, considering the flow in the circumferential direction, the enlarging / reducing portion is repeated, and the pressure loss increases and it becomes difficult to flow. Therefore, the mixing of the exhaust gas and the combustion air can be suppressed to the minimum. FIG. 5 shows the relationship between the shaft center 17 and the heat storage body 25. The shaft 17 and the heat storage body 25 are in contact with each other without a gap as shown in the figure, and the heat storage body 25 is attached to the shaft center 17.
The method of fixing is to join the small-diameter pipes 12 with an adhesive or the like. Alternatively, the top and bottom of the heat storage body 25 are fixed with something like a flange.

Buffer portions are formed at both ends of the heat storage body, respectively. These buffer parts are the partition walls 2
2, 23 are respectively divided in the same direction as the axial center 17 of the cylindrical pipe 11, one of which is an exhaust gas buffer chamber 13, 14 and the other is a combustion air buffer chamber 15, 16. Further, the exhaust gas buffer chambers 13 and 14 are connected to exhaust gas passages 10 and 19 made of pipes, and the exhaust gas passages 10 on the furnace side are connected to the exhaust gas suction holes 7 of the burner 5 by a pipe made of a refractory material, and the other side. The exhaust gas passage 19 is connected to the exhaust gas suction blower by a pipe. Further, in the combustion air buffer chambers 15 and 16, there are combustion air passages 9 made of pipes,
21, the combustion air passage 9 on the furnace side is connected to the burner 5
The combustion air nozzle 6 is connected to the combustion air nozzle 6 by a pipe made of a refractory material, and the other combustion air passage 21 is connected to the combustion air blower by a pipe. The combustion air buffer chamber 16 and the exhaust gas buffer chamber 13 suddenly expand from each passage to each buffer chamber, and since the pressure resistance of the heat storage body 25 is large,
The pressure is equalized in the buffer chamber, and uneven flow of the fluid passing through the heat storage body 25 is prevented. The combustion air buffer chamber 15 and the exhaust gas buffer chamber 14 are rapidly contracted from each buffer chamber to each passage, and the fluid is rectified in the buffer chamber and flows into each passage, so that each pressure and temperature of the fluid become uniform.

FIG. 6 shows the state of the partition walls 22 and 23 between the exhaust gas buffer chambers 13 and 14 and the combustion air buffer chambers 15 and 16. As shown in the figure, the partition walls 22 and 23 are 2-3 times thicker than the small-diameter pipe 12, and when the small-diameter pipe 12 passes through the partition walls 22 and 23 during heat exchange, the partition walls 22 and 23 exhaust gas or burn the gas. The air is contained in the small diameter tube 12 so that the exhaust gas and the combustion air are not continuously mixed. The same applies to the partition wall between the exhaust gas buffer chamber and the combustion air buffer chamber.

In this method for recovering heat from the rotary heat storage device 8, the exhaust gas having a higher temperature from the exhaust gas passage 10 communicating with the inside of the furnace enters the rotary heat storage device 8 and is rectified in the exhaust gas buffer chamber 13 to store the heat storage material. It flows evenly through the inside and outside of each small diameter pipe 12, which is 25. Then, heat is exchanged with the small-diameter pipe 12, and the temperature becomes low,
The temperature and pressure of the fluid are made uniform in the exhaust gas buffer chamber 16, and the fluid is discharged from the exhaust gas passage 19 to the outside through the exhaust gas suction blower. The heat storage body 25 having a high temperature due to heat exchange is rotating around the shaft center 17, passes through the partition walls 22 and 23, and moves from the exhaust gas passage side to the combustion air passage side. On the other hand, combustion air blower blows the combustion air at room temperature to the combustion air passage 21.
Is fed to the rotary type heat storage device 8 through the flow path, is rectified in the combustion air buffer chamber 16, and evenly passes through the small-diameter pipe 12 that is the heat storage body 25. Then, the small diameter pipe 12 heated to a high temperature by the exhaust gas and the combustion air exchange heat, and the combustion air is preheated to a high temperature. The combustion air that has been preheated to a high temperature is rectified in the combustion air buffer chamber 15 so that the temperature and pressure are equalized and is sent from the combustion air passage 9 to the burner 5. Then, the small-diameter pipe 12, which has become low in temperature again, rotates around the axis 17 and moves to the exhaust gas passage side to exchange heat with the exhaust gas again.
As described above, the heat storage body 25 is continuously rotated about the shaft center 17, whereby the heat recovery of the sensible heat of the exhaust gas can be continuously performed. Here, the rotation of the heat storage body 25 is continuously rotating, and the rotation speed thereof increases in proportion to the flow rate of the combustion air and exhaust gas passing through the heat storage body 25.

Next, as a second embodiment, FIG.
The image figure of the industrial furnace which equipped the burner 30 with the described rotary type heat storage device 8 is shown. (A) is a view from outside the furnace, (b) is a view from inside the furnace, (c) is a cross-sectional view of the burner 30 part,
Section (d) is a sectional view of the rotary heat storage device 8 and the exhaust gas suction hole 31. The structure of this industrial furnace is such that the exhaust gas suction hole 31 is arranged in the furnace wall 33 at the center between the burners 30, and the combustion air nozzles 32 are arranged on both sides of the exhaust gas suction hole 31, which are installed outside the furnace. Located on the furnace side. Exhaust gas passage 1 for each nozzle
0 and the combustion air passage 9 are connected by pipes made of refractory material. Here, the rotary regenerator 8 is arranged as close as possible to the industrial furnace, that is, outside the furnace within 2 m from the furnace wall 33 of the industrial furnace. The configuration of the burner 30 is the burner 30.
A fuel nozzle 26 is arranged at the center, a primary air nozzle 27 is arranged around the fuel nozzle 26, and a baffle 29 provided at the tip end thereof is arranged, and the primary combustion port 2 is provided inside the furnace.
Place 8

A feature of this industrial furnace is that the primary combustion port 28, which is a flame stabilizer, improves the combustibility by increasing the amount of primary air when the combustibility is poor such as when the furnace temperature is low. ,
When the combustibility is good, such as when the furnace temperature is high, low NOx properties,
The flow rate of the primary air is reduced in order to improve the heat recovery of the rotary heat storage device 8. By eliminating the burner tile structure, it is possible to achieve low NOx properties and flame extension by increasing the amount of exhaust gas entrainment. When the height of the furnace is restricted by the size of the burner as in the conventional buret heating furnace, the exhaust gas suction hole 31 and the combustion air nozzle 3 are used.
Since 2 is arranged in parallel with the burner, the restriction is eliminated. Further, by disposing the exhaust gas suction hole in the middle between the burners and arranging the combustion air nozzles on the left and right of the exhaust gas suction hole, it is possible to prevent unburned fuel from being sucked from the exhaust gas suction hole.

Next, the rotary type heat storage device 8 in the second embodiment will be described. The detailed configuration is almost the same as that of the rotary type heat storage device in the first embodiment described above. However, in the case of the present embodiment, as described in claim 4, by disposing the rotary regenerator 8 between the burners 30 and 30 as compared with the case of being attached to each burner 30,
The quantity is half. That is, there are two combustion air passages 9 communicating with the rotary regenerator 8 and the furnace side, and the exhaust gas passage 1
There is one 0, and one is in communication with the combustion blower and one is with the exhaust gas blower. Since the combustion air passage 9 communicating with the furnace side is symmetrically arranged with respect to the combustion air buffer chamber 15, the combustion air is not biased.

[0043]

Since the combustion device having the rotary type heat storage device according to claim 1 continuously and highly efficiently recovers heat, all the burners can be burned at the same time, and a switching valve is unnecessary. . Further, since the burner section is independent of the rotary heat storage device, the burner can be designed independently.

Further, by using the rotary type heat accumulator according to the second aspect, the combustion air is preheated to a high temperature and highly efficient heat recovery is continuously performed. Further, since the heat storage body is constituted by an independent small diameter tube, the amount of leak is small and the spalling resistance is good.

Since the industrial furnace equipped with the rotary regenerators according to claims 3 and 4 has the rotary regenerator independently outside the furnace, the number of rotary regenerators is one per burner. Can be reduced in comparison. Also, by eliminating the burner tile structure, it is possible to achieve low NOx properties and flame extension.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a combustion device including a rotary heat storage device, and FIG. 1B is a front view of a combustion device including a rotary heat storage device as viewed from the inside of a furnace.

FIG. 2 is an image diagram of a rotary heat storage device.

FIG. 3A is a view seen from the outside of a part of a furnace wall of an industrial furnace in which a rotary heat storage device is provided independently of a burner, and FIG. 3B is a view showing a rotary heat storage device provided independently of a burner. A view seen from the inside of a part of the furnace wall of the industrial furnace, (c) is a sectional view of the burner of the industrial furnace provided with a rotary regenerator independently of the burner, (d) is a rotary regenerator Sectional view of a rotary regenerator of an industrial furnace provided independently of the above.

FIG. 4 is a diagram showing a relationship (a part I) between a heat storage body inside the rotary heat storage device and a heat storage outer wall of FIG. 2.

FIG. 5 shows the relationship between the axis of the rotary type heat storage device and the heat storage body shown in FIG.
Part).

FIG. 6 is a detailed view of a partition wall in the rotary heat storage device of FIG. 2 (III
Part).

FIG. 7 is a diagram showing a configuration of a combustion device described in Japanese Patent Publication No. 6-56261.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Fuel nozzle 2 ... Primary air nozzle 3 ... Baffle 4 ... Primary combustion port 5 ... Burner 6 ... Combustion air nozzle 7 ... Exhaust gas suction hole 8 ... Rotary heat storage device 9 ... Combustion air passage (communication with the furnace side) 10 ... Exhaust gas passage (communication with furnace side) 11 ... Cylindrical tube 12 ... Small diameter tube 13 ... Exhaust gas buffer chamber (communication with furnace side) 14 ... Exhaust gas buffer chamber (communication with exhaust gas suction blower) 15 ... Combustion air buffer chamber (with furnace side) 16 ... Combustion air buffer chamber (communication with combustion air blower) 17 ... Shaft center 19 ... Exhaust gas passage (communication with exhaust gas blower) 21 ... Combustion air passage (communication with combustion air blower) 22 ... Partition wall (with exhaust gas buffer chamber) Combustion air buffer chamber partition 23) Partition wall (exhaust gas buffer chamber and combustion air buffer chamber partition) 24 ... Drive device 25 ... Heat storage body 26 ... Fuel nozzle 27 ... Primary air nozzle 28 ... Primary combustion port 29 ... Baffle 30 ... Burner 31 ... Exhaust gas suction hole 32 ... Combustion air nozzle 33 ... Furnace wall 34 ... Furnace wall 35 ... Regenerator 36 ... Burner tile 37 ... Furnace 38 ... Fuel nozzle 39 ... Combustion air jet hole 40 ... Combustion air passage 41 ... Heat storage body 42 ... Exhaust gas passage 43 ... Partition plate 44 ... Duct

Claims (4)

[Claims] 1. A primary air nozzle (2) is provided on the outer periphery of a fuel nozzle (1), and a primary combustion port (4) is formed on a baffle (3) provided at the tip of the nozzle. A plurality of combustion air nozzles (6) are evenly arranged around the primary combustion port of the baffle, and a plurality of exhaust gas suction holes (7) are evenly provided outside the combustion air nozzle. To form a burner, and on the other hand, a rotary regenerator (8) is installed in the vicinity of the burner and outside the furnace, and a combustion air passage (9) of the rotary regenerator is installed.
And a combustion air nozzle of the burner, and an exhaust gas passage (10) of the rotary heat accumulator and an exhaust gas suction hole of the burner, respectively, are connected to each other. 2. A drive device (2) is provided inside the cylindrical tube (11).
4) the heat storage body (25) rotatable about the shaft center (17) is provided with a large number of small diameter tubes (12) in the same direction as the shaft center.
To form a buffer part having a constant space at both ends of the heat storage body, and
It is divided into two in the same direction as the axis of the cylindrical portion, one of which is the exhaust gas buffer chamber (13) (14) and the other is the combustion air buffer chamber (1
5) and (16), the exhaust gas buffer chamber is connected to the exhaust gas passages (10) and (19), and the combustion air buffer chamber is connected to the combustion air passages (9) and (21) to form a rotary heat storage unit. The combustion apparatus for an industrial furnace according to claim 1, wherein 3. A primary air nozzle (27) is provided on the outer periphery of the fuel nozzle (26), and a primary combustion port (28) is provided on a baffle (29) provided at the tip of the nozzle.
A plurality of burners (30) each of which is formed on the furnace wall (33) at predetermined intervals, and a cylindrical tube (1) installed outside the furnace.
A heat storage body (25) rotatable around a shaft center (17) by a driving device (24) is formed in the inside of (1) by filling a large number of small diameter tubes (12) in the same direction as the shaft center. , A buffer part having a constant space is formed at both ends of the heat storage body, and each of the buffer parts is divided into two in the same direction as the axis of the cylindrical pipe, one of which is an exhaust gas buffer chamber (13) (14), The other is formed into combustion air buffer chambers (15) and (16), and exhaust gas passages (10) and (19) are connected to the exhaust gas buffer chamber and combustion air passages (9) and (21) are connected to the combustion gas buffer chamber, respectively. The rotary heat storage device is arranged between the burners, and the exhaust gas passage and the combustion air passage located on the furnace side of the heat storage device are formed in the furnace wall. Suction hole (31) and combustion air nozzle (3
A combustion device for an industrial furnace, characterized in that it is made to communicate with the inside of the furnace via 2) respectively. 4. A burner (30) on a furnace wall (33)
An exhaust gas suction hole (31) is provided between the burner (30) and the burner (30), at least two combustion air nozzles (32) are arranged on both sides of the suction hole, and the exhaust gas suction hole (31) is located on the furnace side of the rotary regenerator. Forming at least two combustion air passages (9) for
4. The combustion apparatus for an industrial furnace according to claim 3, wherein the combustion apparatus is configured to communicate with the inside of the furnace through the combustion air nozzle.