JP2819113B2 - Regenerative combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerative combustion apparatus having a regenerator for recovering waste heat and preheating combustion air.

[0002]

2. Description of the Related Art Conventionally, as a combustion apparatus of this kind, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 5-256423 is known. As shown in FIG. 4, the conventional device includes a fuel pipe 32 and a primary air pipe 3 inside a burner 31.
3 is inserted, and an outlet 34 for the fuel G and the primary air A1 is provided at the tip of the burner 31. A plurality of supply / exhaust passages 35A, 35B are formed around the burner 31, and supply / exhaust ports 36A, 36B are provided at the front ends thereof so as to open around the injection port 34.
A and 35B are provided with heat storage bodies 37A and 37B of a ceramic honeycomb structure having air permeability.

The air supply / exhaust passages 35A and 35B are alternately connected to an air supply port and an exhaust port (not shown) by a switching mechanism, and combustion air A2 passes through one heat storage body 37A to the combustion chamber 38. The supplied exhaust gas E generated in the combustion chamber 38 is discharged outside through the other heat storage body 37B. Therefore, the waste heat can be alternately recovered by the heat storage bodies 37A and 37B to preheat the combustion air A2, and the combustion device can be operated with high thermal efficiency.

[0004]

However, according to the conventional regenerative combustion device, since the entire heat storage bodies 37A and 37B have the same ventilation structure, the flow path of the exhaust gas E is limited to a part, and It is difficult to sufficiently preheat the entirety of 37A, 37B, so that not only the waste heat recovery rate decreases, but also the heat storage bodies 37A, 37B are locally deformed or damaged.

[0005] Therefore, an object of the present invention is to provide a heat storage element having a function of diffusing exhaust gas so that the entire heat storage element can be sufficiently preheated and the waste heat recovery rate and life of the heat storage element can be improved. An object of the present invention is to provide a combustion apparatus of the type.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a burner having a fuel and primary air jet at its tip, and a combustion air and exhaust gas around the jet. At least two air supply / exhaust passages provided with air supply / exhaust ports, a gas permeable heat storage body provided in each air supply / exhaust passage, and a switching mechanism for alternately connecting each air supply / exhaust passage to the air supply / exhaust port. In a regenerative combustion device equipped with a regenerator, the regenerator is composed of a plurality of types of regenerators having different ventilation structures, forming a coarse ventilation path on the regenerator on the inlet side of exhaust gas and dense ventilation on the regenerator on the outlet side. A road is formed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the regenerative combustion device of this embodiment includes a main body 1 and a crater 2, and both housings 1 a and 2 a are assembled to be separable by bolts 3. A burner 4 is attached to the center of the main body 1, and an inlet 5 for the fuel G and an inlet 6 for the primary air A1 are provided at the base end. A fuel pipe 7 and a primary air pipe 8 are connected to the inlets 5 and 6, respectively.
Are provided. Further, on the outer periphery of the main body 1, an air supply port 10 for combustion air A2 and an exhaust port 1 for exhaust gas E are provided.
1 are formed.

Inside the main body 1, four supply / exhaust passages 13 are provided.
A and 13B (two adjacent to FIG. 1 are shown) are formed at positions separated by 90 °, and air-permeable heat storage bodies 15A and 15B are installed in each passage via a holder. 180 °
A pair of supply / exhaust passages 13A at distant positions are connected to the first intermediate chamber 17 via the connection pipe 16, and the other pair of passages 13B are connected to the second intermediate chamber 19 via the connection holes 18, respectively. The intermediate chambers 17 and 19 are connected to the air supply port 10 and the exhaust port 11 while being separated from each other by the partition wall 20, and the air supply port 10 and the exhaust port 11 alternately open and close the intermediate chambers 17 and 19. Dampers 21 and 22 are provided rotatably by a motor (not shown). The dampers 21 and 22 constitute a switching mechanism that alternately connects the supply / exhaust passages 13A and 13B to the supply port 10 and the exhaust port 11.

On the other hand, in the crater part 2, the housing 2
A mounting piece 23 attached to a furnace wall or the like protrudes from the outside of a, and a burner tile 24 is housed inside the housing 2a. A combustion chamber 25 is formed at the center of the burner tile 24, and a ring member 26 is inserted into this combustion chamber 25. Ring member 2 around the spout 9
6 includes a supply / exhaust port 27 for the combustion air A2 and the exhaust gas E.
A and 27B are formed at positions corresponding to the supply / exhaust passages 13A and 13B, respectively. Burner tile 2
4 has a combustion chamber 25, an injection port 9 and a supply / exhaust port 2
An annular wall 28 is formed to protrude so as to surround 7A and 27B. Also, at the same angular position as the supply / exhaust passages 13A, 13B, the burner tile 24 is provided with four L-shaped exhaust gas introduction passages 29A, 29B, and sucks exhaust gas E generated in the furnace from outside the annular wall 28. And supply and exhaust port 2
The air is introduced into the air supply / exhaust passages 13A and 13B via 7A and 27B. The annular wall 28 is formed with four communication holes 30 communicating between the inside and the outside thereof in an oblique manner from the front end side of the combustion chamber 25 toward the exhaust gas introduction passages 29A and 29B.

As shown in FIG. 3, the heat storage bodies 15A, 1
5B represents three heat storage elements 15a and 15 having different ventilation structures.
b, 15c. The heat storage element 15a on the inlet side of the exhaust gas E has a coarse ventilation path 150a formed of a tapered hole.
Are formed. The intermediate heat storage element 15b is formed of a three-dimensional net-like porous body, and a net-like air passage 150b that is denser than the air passage 150a is formed over the entire heat storage element 15b. The heat storage element 15c on the outlet side of the exhaust gas E is formed of a honeycomb structure, and a honeycomb-shaped ventilation path 150c that is denser than the ventilation path 150a is formed on the entirety. In addition, as shown in FIG. 4, the intermediate heat storage element 15b and the outlet-side heat storage element 15c can each be formed of a three-dimensional mesh-like porous body.

When the regenerative combustion device configured as described above is operated, the fuel G and the primary air A1 are ejected from the ejection port 9 of the burner 4, and a flame F is formed in the combustion chamber 25. When the dampers 21 and 22 are switched to the positions shown in FIG. 1, as shown by solid arrows in FIG.
The combustion air A2 is introduced from the air supply port 10 into the air supply / exhaust passage 13B through the second intermediate chamber 19 and the connection hole 18, passes through the heat storage body 15B, and is supplied to the combustion chamber 25 from the air supply / exhaust port 27B. . On the other hand, the exhaust gas E generated in the furnace is sucked into the exhaust gas introduction passage 29A from the outside of the annular wall 28 and introduced into the supply / exhaust passage 13A through the supply / exhaust port 27A, as indicated by the dashed arrow in the figure, and the heat storage After preheating the body 15A, the body 15A is discharged to the outside from the exhaust port 11 through the connection pipe 16 and the first intermediate chamber 17.

In this case, since the heat storage body 15A is composed of three types of heat storage elements 15a, 15b, and 15c having different ventilation structures, the flow path of the exhaust gas E is formed by each of the elements 15a to 15c.
Are sequentially diffused in the process of passing through. Therefore, the exhaust gas E
Accordingly, the entire heat storage body 15A can be sufficiently preheated, the waste heat recovery rate can be improved, and local deformation or breakage of the heat storage body 15A can be prevented, and the life thereof can be improved. When the dampers 21 and 22 are switched to the opposite sides, the combustion air A2 and the exhaust gas E flow in the opposite directions, and the regenerator 15A heats the combustion air A2 and the regenerator 1
5B is preheated by the exhaust gas E.

The number of the supply / exhaust passage 13, the heat storage body 15, the supply / exhaust port 27, the exhaust gas introduction passage 29, and the communication hole 30 is four.
The number is not limited to two and may be at least two or more. In addition, the heat storage body 15 may be configured by two or four or more heat storage elements having different ventilation structures. Others
The present invention is not limited to the above embodiment, and may be embodied by appropriately changing the shape and configuration of each part without departing from the spirit of the present invention.

[0014]

As described in detail above, according to the present invention,
Since the heat storage element is composed of a plurality of types of heat storage elements with different ventilation structures, the heat storage element has a function of diffusing exhaust gas, so that the entire heat storage element can be sufficiently preheated, and the waste heat recovery rate and life of the heat storage element can be improved. It has an excellent effect that it can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (a cross-sectional view taken along line AA in FIG. 2) of a regenerative combustion device showing an embodiment of the present invention.

FIG. 2 is a front view of the combustion device.

FIG. 3 is a perspective view showing a configuration of a heat storage body of the combustion device.

FIG. 4 is a perspective view showing another configuration of the heat storage body.

FIG. 5 is a sectional view showing a conventional regenerative combustion device.

[Explanation of symbols]

4 Burner, 5 Fuel inlet, 6 Primary air inlet, 7 Fuel pipe, 8 Primary air pipe, 9
Spout port, 10 ··· Supply port, 11 ·· Exhaust port, 13A, 1
3B ··· Supply / exhaust passage, 15A, 15B ··· Regenerator, 15
a, 15b, 15c ··· heat storage element, 150a, 150
b, 150c air passage, 21, 22, damper, 24
..Burner tiles, 25.Combustion chambers, 27A, 27B
.Supply / exhaust port, 28..annular wall, 29A, 29B..exhaust gas introduction path, 30..communication hole, G..fuel, A1..primary air, A2..combustion air, E..exhaust gas, F ... Flame.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-256423 (JP, A) JP-A-9-112845 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23D 14/66 F23L 15/02

Claims (1)

(57) [Claims] 1. A burner having a fuel and primary air injection port at its tip, at least two air supply and exhaust passages having combustion air and exhaust gas supply ports around the injection port. In a regenerative combustion device including a gas permeable heat storage body installed in an exhaust passage, and a switching mechanism that alternately connects each air supply / exhaust passage to an air supply port and an air exhaust port, the heat storage body has a plurality of ventilation structures having different ventilation structures. A regenerative combustion device comprising a plurality of types of thermal storage elements, wherein a coarse ventilation path is formed in the thermal storage element on the inlet side of the exhaust gas and a dense ventilation path is formed in the thermal storage element on the outlet side.