JPH1172224A - Regenerative alternative combustion burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a pipeline system for switching air supplying into air discharging, in a regenerative alternating combustion burner, recovering waste heat by left and right heat storage body filling units in a single burner. SOLUTION: Two pieces of venting holes 5, communicated with respective air passages, are provided on an outer wall surface, contacted with both air passages 3a, 3b nearer to the air supplying and discharging side than heat storage body filling units 4a, 4b in a burner main body 1, and a cover case 6 is attached so as to cover both of the venting holes 5 while an air supplying pipe 8a and an air discharging pipe 8b are connected to both side walls of the cover case 6, opposed so as to pinch both venting holes 5, and, further, a vane, driven so as to be turned about an axis orthogonal to the air supplying and discharging pipes 8a, 8b, is provided between both venting holes 5 to communicate both of the venting holes 5 alternately with either one of the air supplying pipe 8a or the air discharging pipe 8b through the vane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative alternating combustion burner used for a metal heating furnace or the like.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional regenerative alternating combustion burner of this type, in which a fuel supply passage 2 is provided at the center of a cylindrical body 1 of the burner, and a left and right side of the cylindrical body 1 is provided. Are provided with ventilation passages 3a and 3b, and combustion air is alternately supplied from the left and right ventilation passages 3a and 3b into the furnace. The air is used to burn the fuel supplied from the fuel supply passage 2 and the ventilation passages on the other side. 3b, 3a, the furnace exhaust gas is sucked from the furnace, and heat storage material filling chambers 4a, 4b each filled with a heat storage material are provided in each of the ventilation passages 3a, 3b. The supplied air is preheated, and two alternating combustion burners which are usually installed at two places on the furnace wall and alternately supply and exhaust air are combined into one, Compact and inexpensive high-pressure suitable for relatively small industrial furnaces Those that provided the rate burner.

[0003]

However, in the above-described configuration, since it is necessary to supply the combustion air and supply the exhaust gas simultaneously with a single burner, each of the heat storage element filling sections 4 is supplied at regular intervals. It is necessary to switch between the air blower 12 and the exhaust blower 13. Therefore, when the four-way switching valve 15 is used as shown in FIG. 6A, or on-off valves 16a and 16B as shown in FIG.
In each of the cases where four b, 16c and 16d are used, a large number of supply ducts and exhaust ducts intersect in addition to the main fuel and flame holding fuel supply pipes and fuel control valves (not shown). Not only does it take up installation space, but it is also cumbersome to assemble, and the work of attaching and detaching the burner during maintenance and inspection is extremely troublesome. In view of the foregoing, an object of the present invention is to provide a regenerative alternating combustion burner of this type which is simplified in piping behind the burner and is compact and easy to operate.

[0004]

As shown in FIGS. 1 to 4, a regenerative alternating combustion burner according to the present invention encloses a fuel supply passage 2 provided at a central portion in a burner main body 1 and has left and right ventilation passages 3.
a, 3b are provided to supply combustion air into the furnace from one of the ventilation paths 3a, to suck high-temperature exhaust gas from the furnace from the ventilation path 3b on the other side, and to intake and exhaust air from the ventilation paths 3a, 3b. Are alternately switched so as to preheat the combustion air with the heat recovered from the exhaust gas at the heat storage material filling portions 4a and 4b inserted into the ventilation passages 3a and 3b. Two ventilation holes 5 communicating with the respective ventilation paths are provided on the outer wall surface in contact with the ventilation paths 3a, 3b on the supply / exhaust side of the filling portions 4a, 4b so as to cover the ventilation holes 5 respectively. The air supply pipe 8a and the exhaust pipe 8b are connected to both side walls of the cover case 6 which face each other across the air holes 5, and the air supply pipe 8a is further provided between the air holes 5a. , Driven around an axis orthogonal to 8b The slats 9 are provided to be alternately supply and exhaust pipe 8a or 8b of the both vent holes 5 by the vane plates 9
Is communicated with any one of the above. With this configuration, in the present invention, the function of the four-way switching valve 15 or the on-off valves 16a, 16b, 16c, 16d provided separately from the conventional burner main body 1 in FIG. Four-way switching valve 15
Alternatively, the piping 17 from the on-off valves 16a, 16b, 16c, 16d to the burner main body 1 is omitted, and a sufficient space is secured behind the burner main body 1 so that maintenance and inspection can be easily performed. is there.

[0005]

1 to 4 show one embodiment of a regenerative alternating combustion burner according to the present invention.
A fuel supply passage 2 provided at a central portion of the inside has a left and right two main fuel supply pipes 2a and 2b whose tip nozzle portions are bent obliquely outward in a flame holding air supply tube 2 and a flame holding line. Fuel supply pipe 2
c.
Divided air passages 3a and 3b are formed. In each of the ventilation passages 3a and 3b, a heat storage body filling section 4 whose front end is partitioned by a ceramic grid 10 and whose rear end is partitioned by a wire mesh 11 is provided.
a, 4b are provided, and these heat storage material filling portions 4 are provided.
Each of a and 4b is filled with, for example, ceramic small balls (diameter: 10 to 20 mm) as heat storage bodies.

The above-mentioned filling portions 4a, 4b in the burner main body 1
Two ventilation holes 5a, 5 communicating with the respective ventilation paths are provided on the outer wall surface in contact with the ventilation paths 3a, 3b on the supply / exhaust side.
b is provided, and a box-shaped cover case 6 is attached so as to cover these ventilation holes 5, and air supply pipes 8 a are provided on both side walls of the cover case 6 which face each other with the ventilation holes 5 interposed therebetween.
And the exhaust pipe 8b. Cover case 6
As shown in FIG. 2, a blade plate 9 is provided between the two ventilation holes 5 and is rotatably driven by a motor or an air actuator 9a around an axis perpendicular to the supply / exhaust pipes 8a and 8b. The rotation of the blade plate 9 allows the two ventilation holes 5 to alternately communicate with one of the supply and exhaust pipes 8a and 8b. In the figure, reference numeral 14 denotes a stopper frame for restricting the rotation range of the blade plate 9.

FIG. 4 is a diagram showing a piping system of the burner shown in FIG. 1. The air supply blower 12 and the exhaust blower 13 are connected to the left and right ventilation passages 3 via a supply / exhaust switching mechanism in the cover case 6.
a, 3b, and the blades 9 are alternately switched so that the main air for combustion is supplied to one of the ventilation furnaces 3a,
The furnace exhaust is sucked from the other ventilation path 3b. In addition, the main fuel is alternately switched in synchronization with the blade plate 9, and the fuel is supplied to the fuel supply pipe 2a or 2b on the combustion air supply side. The flame holding fuel and flame holding air are
It is always supplied until the furnace temperature reaches the fuel ignition temperature,
Even after the fuel ignition temperature is reached, the supply of air to the flame holding air supply pipe 7 is continued to cool the fuel supply pipes 2a and 2b.

In this embodiment, as shown in FIG. 1, the tip nozzles of the two fuel supply pipes 2a and 2b are inclined on one side to the left and on the other side to the right. When the fuel is supplied alternately to the ventilation paths 3a, 3b, the fuel is always switched to the fuel supply pipes 2a, 2b on the combustion air side, so that the fuel gas always blows away from the exhaust-side ventilation path. There is no danger of being sucked into the exhaust-side ventilation passage in an unburned state. Also, the fuel supply pipes 2a, 2b
Since the fuel gas can be brought closer to the combustion air by inclining the tip nozzle portion of the fuel cell, the flame length can be made shorter than in the prior art, and it can be adapted to a small furnace.

[0009]

According to the present invention, as described above, the four-way switching valve 15 conventionally provided separately from the burner main body 1 is provided.
Are omitted, and the supply / exhaust switching mechanism is provided integrally with the burner main body 1. Therefore, a frame for supporting the four-way switching valve 15 is not required, and the piping 17 from the four-way switching valve 15 to the burner main body 1 is not required. Can be omitted, the installation work at the site is significantly simplified, and a sufficient space can be secured behind the burner main body 1, so that the supply and exhaust piping can be simplified. Can be
There is an advantage that the work of attaching and detaching the burner at the time of maintenance and inspection can be performed very easily.

[Brief description of the drawings]

FIG. 1A is a longitudinal sectional view of one embodiment of the present invention, and FIG.
FIG.

2A is a cross-sectional view of a main part of the present invention, and FIG. 2B is a vertical cross-sectional view of the same.

FIG. 3 is a perspective view showing an operation state of the above.

FIG. 4 is a piping system diagram of the same.

FIG. 5 is a sectional view of a conventional example.

6 (a) and 6 (b) are piping diagrams of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Burner main body 2 Fuel supply path 2a, 2b, 2c Fuel supply pipe 3a, 3b Vent path 4a, 4b Heat storage material filling part 5 Vent hole 6 Cover case 7 Flame holding air supply cylinder 8a, 8b Supply / exhaust pipe 9 Blade plate 10 Ceramic lattice 11 Wire mesh 12 Air supply blower 13 Exhaust fan 14 Stopper frame 15 Four-way switching valve 16a, 16b, 16c, 16d On-off valve 17 Piping

Claims (1)

[Claims] 1. A ventilation passage is provided on the left and right surrounding a fuel supply passage provided at a central portion in a burner main body, combustion air is supplied into the furnace from one of the two ventilation passages, and the furnace is supplied from the other ventilation passage. The high-temperature exhaust gas inside is sucked, and the intake air and the exhaust gas are alternately switched between the two air passages, so that the combustion air is preheated by the heat recovered from the exhaust gas at the heat storage material filling sections interposed in each air passage. In the regenerative burner described above, two ventilation holes communicating with the respective ventilation paths are provided on the outer wall surface in contact with both ventilation paths on the supply / exhaust side of the respective filling portions in the burner body, and both ventilation holes are provided. A cover case is attached so as to cover, and an exhaust pipe and an air supply pipe are connected to both side walls facing each other across the air holes of the cover case, and a shaft orthogonal to the air supply / exhaust pipe is provided between the air holes. A wing plate that is driven to rotate around is provided. A regenerative alternating combustion burner in which both vent holes are alternately communicated to one of the supply and exhaust pipes by means of a root plate.