JP2857352B2 - How to respond to change of gas type of combustion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises two supply members having gas supply passages for supplying a fuel gas to a combustion section of a combustion apparatus, and a packing is sandwiched between the two supply members. The present invention relates to a method for responding to a change in gas type of a combustion apparatus configured to connect and fix the gas supply passages.

[0002]

2. Description of the Related Art In a combustion apparatus using gas as a fuel,
When a gas with a low Wobbe index such as 5C or 6A is converted to a gas with a high Wobbe index such as 13A, it is necessary to adopt some countermeasures such as replacing the gas nozzle or changing the flow resistance of the gas supply path. is there. In this case, since it is easier to change the flow resistance of the gas supply path than to replace the gas nozzle, conventionally, a corresponding method of changing the flow resistance has been frequently used, and as a part for changing the flow resistance, Generally, an orifice is used.

Conventionally, when an orifice is interposed in a gas supply path to cope with a change in gas type, a supply pipe incorporating a predetermined orifice is prepared in advance, and this supply pipe is placed in the middle of an existing supply pipe. Or an orifice was installed in the existing supply pipe. Further, a variable orifice capable of changing the flow resistance is previously installed in the supply pipe, and a corresponding method of changing the flow resistance by operating the variable orifice at the time of gas conversion is also known. In addition, the response by changing the flow resistance was performed independently of the seal packing.

[0004]

By the way, in the above-mentioned conventional method, when preparing a supply pipe in which a predetermined orifice is previously incorporated, the supply pipe itself becomes somewhat large, so that the existing supply pipe is not provided. In the case of assembling the orifice, means for fixing the orifice to the supply pipe is required, and in the case of previously installing a variable orifice in the supply pipe, an expensive variable orifice is required. For this reason, there has been a drawback that the change by changing the flow resistance is expensive.

The present invention focuses on a seal packing which is indispensable for a combustion device in order to solve such a conventional drawback. The purpose of the present invention is to utilize a packing which is indispensable for a combustion device as it is. It is an object of the present invention to provide a method for responding to a change in gas type, which can change a flow resistance required at the time of gas switching or the like at low cost.

[0006]

According to the first aspect of the present invention, there are provided a plurality of types of packing for limiting a fuel gas supply amount in a gas supply path to different supply amounts. These gaskets are selected and used depending on the type of gas to be used. Therefore, when switching gas from low wobbe gas to high wobbe gas, or when switching gas from 13A to LPG even with the same high wobbe gas. In this case, it can be dealt with simply by replacing the gasket with a gasket suitable for the gas to be used. Further, when manufacturing the combustion apparatus, all parts including the gas nozzle are manufactured in common, and only the packing is selectively used.
It is possible to manufacture a combustion device suitable for LPG and a combustion device suitable for LPG, and a combustion device suitable for low wobbe gas and a combustion device suitable for high wobbe gas. You can also plan.

According to the second aspect of the present invention, the plurality of types of packings include a packing in which an orifice for restricting a supply amount of fuel gas is fixed to an opening thereof, and a packing in which the orifice is not fixed. Therefore, for example, at the time of gas switching from low wobbe gas to high wobbe gas, when using low wobbe gas, select a packing that does not have an orifice fixed, and at the time of conversion to high wobbe gas, replace the gasket with a gasket with an orifice fixed. Of course, the use of an orifice fixed to the packing is used to limit the supply of fuel gas at that time in order to be able to cope with the change of species. Can be made of metal or resin with excellent precision, Limiting the fuel gas supply amount can be performed as desired that.

According to the third aspect of the present invention, when the orifice is fixed to the packing, the orifice is fixed to the packing by insert molding.
For example, compared to the case where the orifice is bonded to the packing, the packing with this orifice is relatively simple,
It can be easily manufactured, and the orifice is firmly fixed to the packing.

According to a fourth aspect of the present invention, the combustion device includes a plurality of rich combustion sections each having a rich combustion port for burning a rich mixture, and a lean combustion section for burning a lean mixture. A plurality of lean burn sections having a flame opening are alternately arranged in parallel, a rich gas supply path for supplying fuel gas to the rich burn section, and a lean gas supply path for supplying fuel gas to the lean burn section A gas burner having a passage, and the packing is selected and interposed between the rich gas supply passage and the lean gas supply passage, for example, the present low wobbe gas, but later high wobbe gas In such a case, the gasket can be selectively used, and only when the low wobbe gas is used, only the rich combustion portion of the concentration combustion device is burned, and when the high wobbe gas is used, the concentration combustion is performed. A light and shade combustion device for 13A Luke, will be whether and for LPG, it is possible to cope with only the selection of the packing.

[0010] In other words, in order to use a lean burn apparatus suitable for high wobbe gas for low wobbe gas, for example,
The lean gas supply path is interposed with a packing whose opening is closed, the light gas supply path is shut off, and only the rich combustion portion is burned to be usable. Then, when converted to high wobbe gas, replace the packing of the gas supply passage for light with a packing having a normal opening, and,
By interposing a packing with an orifice in the enrichment gas supply path, it is possible to respond without replacing the gas nozzle.
It can be performed easily and at low cost. Also, at the time of manufacturing this concentration combustion apparatus, all parts other than the packing with the orifice are manufactured in common, and only the packing with the orifice is selectively used, for example, the concentration combustion apparatus suitable for 13A and the LPG suitable for LPG. It is possible to manufacture a lean burn device or a lean burn device suitable for low wobbe gas and a lean burn device suitable for high wobbe gas, and to reduce the cost by using common manufacturing parts.

According to the fifth aspect of the present invention, since the two supply members for sandwiching the packing are usually a gas header and a gas connecting pipe which sandwich the packing therebetween, a special structure for interposing the packing is provided. And there is no particular cost increase. Further, the gas header is provided integrally with a rich gas header for supplying fuel gas to the rich combustion section and a lean gas header for supplying fuel gas to the lean combustion section, and the rich gas header is the first rich gas header. A second rich gas header, which is partitioned into a second rich gas header, wherein the gas connecting pipe is connected to the first rich gas header and the second rich gas header. Also, since it is provided integrally with a lean gas supply passage communicating with the lean gas header, for example,
By providing an electromagnetic valve for interrupting the supply of fuel gas in the first rich gas supply passage, it is possible to switch between two stages of high load and low load during rich combustion using low wobbe gas, and Also, even during rich combustion using high wobbe gas, this rich combustion can be switched and used in two stages, and the first rich packing and the second rich gas are provided between the gas header and the gas connecting pipe. And the packing formed integrally with the light packing and the light packing are connected to each other, so that a total of three packings can be handled integrally, There is no possibility that the combination of the packings attached to the second concentrated gas supply path and the light gas supply path is mistaken, and the flow resistance ratio between the gas supply paths can be definitely set as desired. , Replacement or packing at the gas conversion, without the mounting of the packing mistake when thick and thin fuel combustion device fabrication, such as 13A or for a LPG, and easily, can be quickly performed.

According to the invention described in claim 6, the plurality of types of packings have orifices fixed to openings of the first thickening packing and the second thickening packing, and an opening of the light packing. And a packing in which the orifices are not fixed to the openings of the first dense packing and the second dense packing, and the openings of the light packing are closed. From now on, if low wobbe gas is currently used and it is later switched to high wobbe gas, the orifice is not fixed to the opening of the first thick packing and the second thick packing when low wobbe gas is used, and light By interposing the packing with the opening of the packing closed, it is possible to use this lean-burn combustion device as a combustion device dedicated to rich combustion using low wobbe gas, Fixed orifice in the opening of the first dark for packing and the second deep packing upon conversion to gas,
In addition, by replacing the packing with the orifice not fixed to the opening of the light packing, it can be used as a light and shade combustion apparatus.

According to the invention described in claim 7, the plurality of types of packings include the first thickening packing and the second thickening packing, and a packing having an orifice fixed to an opening of the light packing. Since the first thick packing and the second thick packing, and the packing which does not have an orifice fixed to the opening of the light packing, all other parts except the packing are manufactured with common parts. ,
In addition, for example, 1
As long as a gas nozzle for 3A is attached, a gaseous combustion device for 13A can be obtained by using a gasket having no orifice fixed to the opening of the first and second gasket and light gasket, and By using packings with orifices fixed to the openings of the first and second thickening packings and light packings, it becomes a light and shade combustion device for LPG, and almost all parts are shared, and lightening for 13A and LPG are used. The combustion device can be manufactured at low cost.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for responding to a change in gas type of a combustion apparatus according to the present invention will be described with reference to the drawings. First, an embodiment of a combustion apparatus will be described with reference to FIGS. 1 to 3. A rectangular combustion chamber case 2 is provided inside a rectangular burner case 1 and a flat combustion chamber case 2 is provided inside the combustion chamber case 2. A large number of burners 3 for rich combustion as rich combustion sections are housed side by side at predetermined intervals. A fan 4 for supplying combustion air and cooling air is positioned below the burner case 1, and a discharge port 4 a of the fan 4 is opened at the bottom of the burner case 1. An air chamber 6 is formed between the bottom of the combustion chamber case 2 and the air conditioning plate 5 formed of a perforated plate forming the bottom of the combustion chamber case 2.

The burner 3 for rich combustion has a flat rich burner port 7 for discharging a rich mixture having a low primary air mixing ratio upward.
And a rich mixing chamber 8 communicating with the rich flame port 7, a rich inlet 9 for introducing fuel gas for generating a rich mixture and combustion air into the rich mixing chamber 8, and the like. ing. The burner 3 for rich combustion is formed from a single metal plate-like body, and the plate-like body is bent and bonded at the portion of the flame 7 for thickening, and the mixing chamber 8 for thickening and the introduction for thickening are used. In addition to forming the opening 9, a light gas passage 11 of the burner 10 for light combustion, which will be described later,
A light inlet 12 having an elliptical cross section for introducing a fuel gas and combustion air into the gasket is integrally formed of the same plate-shaped body, and its periphery is joined by spot welding.

By arranging 16 flat rich burner burners 3 formed in this manner side by side in the combustion chamber case 2 at predetermined intervals, a distance of 15 between the adjacent rich burner burners 3 is obtained. Pieces of flat spacing spaces are formed, and these 15 spacing spaces are used for forming the burner 10 for light combustion as a light combustion portion. Specifically, between the rich flame ports 7 of the burner 3 for rich combustion, a light flame port 13 for discharging a light air-fuel mixture having a large primary air mixing ratio upward is configured. Is formed as a light mixing chamber 14, and the air-fuel mixture is blown into the light mixing chamber 14 from a plurality of outlets 15 formed in the light gas passage 11. In addition, a plurality of straightening plates 16 fixed to the burner 3 for rich combustion are arranged so as to be located at each of the light burner ports 13.

A casting gas header 17 as a fuel gas supply member is provided in front of the rich inlet 9 of the rich burner 3 and the lean inlet 12 of the light burner 10. As shown in FIG. 4, the gas header 17 is divided into a concentrated gas header 19 and a light gas header 20 by a partition wall 18a, and the concentrated gas header 19 is separated by a separate partition wall 18b. It is partitioned into a first concentration gas header 19a and a second concentration gas header 19b. The enrichment gas header 19 includes, for example, a first enrichment gas header 19a and a second enrichment gas header 19b for every other enrichment gas nozzle 21 for low wobbe gas such as 5C or 6A.
Gas header 2
0 is provided with a total of 15 light gas nozzles 22 for high wobble gas such as 13A and LPG.

FIGS. 5 and 6 show the gas header 17.
As shown in FIG. 2, two concentrated gas supply paths 23 each including a first concentrated gas supply path 23a and a second concentrated gas supply path 23b.
And a gas connecting pipe 25 made of casting as a supply member having a total of three gas supply paths, namely, one gas supply path 24
Are detachably fixed by a plurality of bolts 27 with the sealing gasket 26 sandwiched between the gas header 17 and the gas connection pipe 25. In this fixed state, the first concentrated gas supply passage 23a Is configured to be able to communicate with the first concentrated gas header 19a, the second concentrated gas supply passage 23b is communicated with the second concentrated gas header 19b, and the light gas supply passage 24 is communicated with the light gas header 20. The first rich gas supply passage 23a and the second rich gas supply passage 23b
First solenoid valve 28a for intermittently interrupting the flow of fuel gas
And a second rich solenoid valve 28b, and the lean gas supply path 24 is provided with a lean solenoid valve 29 for interrupting the flow of the fuel gas.

The first and second enrichment solenoid valves 28a, 28
b and the lean solenoid valve 29 are incorporated in one valve block 30, and the valve block 30 is fixed to the gas connection pipe 25 and the first rich gas supply passage 23
a, the second concentrated gas supply passage 23b and the main gas supply passage 31 upstream of the branch point of the light gas supply passage 24
Has an electromagnetic proportional valve 3 for adjusting the total amount of fuel gas to be supplied.
2 and a safety valve 33 are provided. The operation of the first rich solenoid valve 28a, the second rich solenoid valve 28b, the lean solenoid valve 29, the electromagnetic proportional valve 32, the safety valve 33, the fan 4, and the like is controlled by the control unit H. It is configured as follows.

As shown in FIGS. 7 and 8, the packing 26 has, as a rule, a first rich packing 26a having an opening communicating with the first rich gas supply passage 23a, and a second rich gas supply passage. The second packing 26b has an opening communicating with the gas supply passage 23b, and the light packing 26c has an opening communicating with the light gas supply passage 24. The three packings 26a, 26b , 2
6c is integrally formed of a rubber material. Of the three packings 26a, 26b, 26c, the opening of the first packing 26a and the opening of the second packing 26b are respectively provided with thickening orifices 3 made of metal or synthetic resin.
4 and a lightening orifice 35 also made of metal or synthetic resin in the opening of the light packing 26c.
Each is fixed by insert molding.

The rich orifice 34 and the light orifice 35 are provided so that the gas gas nozzle 21 and the light gas nozzle 22 do not have to be replaced each time when the type of gas to be used is changed by gas conversion or the like. And the flow resistance of the second rich gas supply passages 23a and 23b and the flow resistance of the light gas supply passage 24 are respectively changed to change the flow resistance of the heavy gas supply passages 23a and 23b and the light gas supply passage 24.
7 to adjust the supply amount of the fuel gas and the ratio of the supply amount to the fuel gas.
In addition to 6, several types of packings 26 are prepared in advance.

FIG. 9 shows this, and FIG. 9 (A) shows that there is no orifice in each opening of the first dark packing 26a and the second dark packing 26b, The packing 26c has a closed opening 26c. The one shown in (b) has a thickening orifice 34 in each opening of the first darkening packing 26a and the second darkening packing 26b.
Is fixed by insert molding, and the light packing 26
The packing 26 has no orifice in the opening of c.
(C) shows a packing 26 having no orifice in all openings of the first packing 26a, the second packing 26b, and the light packing 26c. 26 are prepared in advance.

The concentration gas nozzle 21 is connected to each concentration inlet 9.
The burner case 1 and the combustion chamber case 2 are blown by the fuel gas blown from the rich gas nozzle 21.
A part of the cooling air flowing between the enrichment inlet 9 is sucked at a predetermined ratio by an ejector action and mixed in the process of passing through the enrichment mixing chamber 8 to generate an enriched air-fuel mixture. The air-fuel mixture is discharged from the thick flame 7. Similarly, the lean gas nozzle 22 faces each of the lean gas inlets 12, and when the fuel gas is blown from the lean gas nozzle 22, a part of the cooling air is similarly discharged at a predetermined rate by an ejector action. It is sucked into the inlet 12 and mixed in advance in the course of passing through the lean gas passage 11, and the air-fuel mixture is injected into the discharge port 15 of the lean gas passage 11.
From the light mixing chamber 14. Then, in the light mixing chamber 14, the air-fuel mixture from the jet port 15 and the air conditioning plate 5
Is mixed with the combustion air supplied from the air chamber 6 via the air chamber 6 to generate a lean mixture, and the lean mixture is discharged from the lean flame 13.

The light mixture thus generated is discharged from the light flame port 13 and burned, and the rich mixture is discharged from the rich flame port 7 adjacent to the light flame port 13 and burned. By doing so, the lean burn is performed,
In this lean-burn combustion, the gas used is a gas with a high Wobbe index,
In addition, it is executed only during high-load combustion, and when the used gas is a gas having a low Wobbe index, for example, rich combustion is performed in which only the rich mixture is burned.

FIG. 10 shows this combustion state. When the used gas is a low wobbe gas such as 5C or 6A, the first and second enrichment solenoid valves 28a, 28a and 2b are used during high load combustion.
8b is opened, all of the 16 rich burners 3 burn, and during low load combustion, the first rich solenoid valve 28a opens and the second rich solenoid valve 28b closes. , Only eight rich burners 3 burn. In addition, in the case of using this low wobbe gas, as described later, the light gas supply passage 24
Remains closed. When the gas used is a high wobbe gas such as 13A or LPG, during high load combustion, the first and second rich solenoid valves 28a and 28b and the lean solenoid valve 29 are opened, and the 16 rich solenoid valves 29 are opened. All the burners of the combustion burner 3 and the fifteen light-burning burners 10 burn, and at the time of low load combustion, the first rich solenoid valve 28a is opened, and the second rich solenoid valve 28b and the lean burn valve 28b are burned. When the solenoid valve 29 is closed, only the eight rich combustion burners 3 burn, and between the low load and the high load, the light solenoid valve 29 closes and the first and second rich burners 3 close. The solenoid valves 28a and 28b are opened, and the 16 rich combustion burners 3 burn.

For example, in a specification in which a low wobbe gas of 5C or 6A is used at present and a high wobble gas of 13A is used at a later date, in order to cope with the change of the gas type, the concentration combustion device is dedicated to the rich combustion using the low wobbe gas. In order to use it as a combustion device for
A thick gas nozzle 21 for C and 6A is attached, a light gas nozzle 22 for 13A is attached to a light gas header 20, and a packing 26 shown in FIG. In the packing 26 shown in FIG. 9A, since the opening of the light packing 26c is closed, the light gas supply passage 24 is closed, and the above-described rich combustion is performed.

Thereafter, at the time of conversion to 13A, the packing 26 used so far is removed and replaced with a packing 26 shown in FIG. The new packing 26 includes first and second thick packings 2.
In the openings of 6a and 26b, the thickening orifice 34 for the high wobbe gas which gives the flow resistance suitable for 13A even though the thickening gas nozzle 21 is for the low wobbe gas.
Are fixed, the first and second concentrated gas supply paths 2
The supply amount of the fuel gas to 3a, 23b is adjusted to an amount suitable for 13A. Further, although there is no orifice in the opening of the pale gasket 26c, since the pale gas nozzle 22 for 13A is attached to the pale gas header 20 in advance, the supply amount of the fuel gas to the pale gas supply passage 24 is also reduced. The amount is adjusted to an appropriate amount. Therefore, it is not necessary to replace the rich gas nozzle 21 or the light gas nozzle 22 at the time of gas conversion, and it is possible to cope with gas conversion only by replacing the packing 26.

In addition, by selectively using only the packing 26, for example, a 13A light and dense combustion device and an LP
It is also possible to provide a lean-burn device for G. That is, all the parts other than the packing 26 are manufactured as common parts, and the enrichment gas nozzle 19 is attached to the enrichment gas header 19, and the enrichment gas nozzle 21 is also attached to the enrichment gas header 20.
The light gas nozzle 22 for A is attached. And if the packing 26 shown in FIG.
When the packing 26 shown in FIGS. 7 and 8 is attached, the fuel is supplied to the first and second rich gas supply passages 23a and 23b by the rich orifice 34 and the light orifice 35. The supply amount of the gas and the supply amount of the fuel gas to the lean gas supply passage 24 are adjusted to provide a light and shade combustion device for LPG. It is also possible to produce a combustion device.

[Alternative Embodiment] In the above-described embodiment, the description has been given of the case of the lean burn device as an example of the burner. However, the present invention is not necessarily limited to the lean burn device, and the supply amount of the fuel gas is limited. Although the orifice has been described as an example, the configuration may be such that the supply area of the fuel gas is restricted by changing the opening area of the opening of the packing. In addition, although the three packings of the first rich packing 26a, the second rich packing 26b, and the light packing 26c are integrally formed, the number of gas supply paths of the combustion device to be used is limited. Accordingly, four or more packings can be integrally formed and implemented. Further, all the packings do not necessarily need to be integrally formed. It is possible to freely change according to the structure of the combustion device to be used, such as by integrally forming the packing 26b for the second concentration and separately forming the packing 26c for the light, or separately forming all the packings. it can. Also, the orifices 34, 35 are connected to the respective packings 26a,
Instead of being fixed by insert molding, it can be fixed to the openings 26b and 26c by an adhesive or by using a fixing tool such as a screw.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a right side cross-sectional view of a concentration combustion device.

FIG. 2 is a perspective view, partially cut away, of the concentration combustion device.

FIG. 3 is an enlarged cross-sectional front view of the concentration combustion device.

FIG. 4 is a schematic configuration diagram of the concentration combustion apparatus as viewed from the front.

FIG. 5 is a partially cutaway rear view of a gas header and a gas connection pipe.

FIG. 6 is a sectional view of a gas header and a gas connection pipe.

FIG. 7 is a plan view of a packing.

FIG. 8 is a sectional view of a packing.

FIG. 9 is a sectional view of another packing.

FIG. 10 is a schematic diagram showing a combustion state of the concentration combustion device.

[Explanation of symbols]

 3 Rich Burning Part 7 Rich Burning Port 10 Light Burning Portion 13 Light Flame Port 17 Gas Header as Supply Member 19 Rich Gas Header 19a First Rich Gas Header 19b Second Rich Gas Header 20 Light Gas Header 23 Rich Gas Supply Path 23a First concentrated gas supply path 23b Second concentrated gas supply path 24 Light gas supply path 25 Gas connecting pipe as a supply member 26 Packing 26a First concentrated packing 26b Second concentrated packing 26c Light packing 34, 35 orifice

──────────────────────────────────────────────────続 き Continuation of front page (51) Int.Cl. ⁶ identification code FI F24H 1/00 301 F24H 1/00 301C (58) Fields investigated (Int.Cl. ⁶ , DB name) F23D 17/00 F23C 11 / 00 F23D 14/08 F24H 1/00 F16J 15/10

Claims (7)

(57) [Claims] The two supply members (1) having a gas supply passage (23) for supplying a fuel gas to a combustion part (3) of a combustion device.
7) and (25), and these two supply members (1)
7) A change in the gas type of the combustion device, which is configured to connect and fix the gas supply passages (23) of the two supply members (17) and (25) with a packing interposed therebetween between (25) and (25). A corresponding method, comprising preparing a plurality of types of packings (26) for limiting a fuel gas supply amount in the gas supply path (23) to different supply amounts, and selectively using the plurality of types of packings (26). A method for responding to a change in gas type of a combustion device, characterized by corresponding to a gas type to be used. 2. An orifice (3) for restricting a supply amount of fuel gas to an opening of the plurality of types of packings (26).
4. The method according to claim 1, comprising a packing (26a) having a fixed affixed portion, and a packing (26a) having a fixed orifice. 3. An orifice (34) is provided with a packing (2).
3. The method according to claim 2, wherein said orifice (34) is fixed to said packing (26a) by insert molding in order to fix it to 6a). 4. A plurality of rich combustion sections (3), wherein said combustion device comprises a rich flame port (7) for burning a rich mixture.
And a plurality of light burning sections (10) each having a light burning port (13) for burning a lean air-fuel mixture are alternately arranged side by side to supply fuel gas to the rich burning section (3). Gas supply path (2
3) and a lean-burn combustion apparatus having a lean gas supply passage (24) for supplying a fuel gas to the lean combustion section (10),
The rich gas supply path (23) and the lean gas supply path (24)
4. The method according to claim 1, 2 or 3, wherein said packing (26) is selectively interposed. 5. The two supply members (17), (25).
Are a gas header and a gas connecting pipe, wherein the gas header (17) supplies fuel gas to the rich gas header (19) for supplying fuel gas to the rich combustion section (3) and fuel gas to the lean combustion section (10). And a concentrated gas header (19) is divided into a first concentrated gas header (19a) and a second concentrated gas header (19b). A connecting pipe (25) has a first rich gas supply path (23a) communicating with the first rich gas header (19a) and a second rich gas supply path (23) communicating with the second rich gas header (19b). 23b) and a light gas supply passage (2) communicating with the light gas header (20).
4), and a first packing (26a), a second packing (26b), and a light packing (26c) between the gas header (17) and the gas connection pipe (25). 5. The method according to claim 4, wherein a packing (26) integrally formed in a state of being connected to the other is selected and interposed. 6. The plurality of types of packings (26) include a first thickening packing (26a) and a second thickening packing (2).
An orifice (34) is fixed to the opening of 6b), and
A packing (26) in which an orifice is not fixed to the opening of the light packing (26c); and an orifice not fixed to the opening of the first packing (26a) and the second packing (26b). And a packing (26) in which an opening of the light packing (26c) is closed.
A method for responding to a change in gas type of the combustion device described in the above. 7. The packing of the first type (26a) and the packing of the second type (2).
6b) and packing (2) in which orifices (34) and (35) are fixed to the opening of light packing (26c).
6), the first thick packing (26a), the second thick packing (26b), and the light packing (26c).
Packing with no orifice fixed to the opening of
6. A method for responding to a change in gas type of the combustion apparatus according to claim 5, comprising: