JPH06272824A - Combustion apparatus for thick and thin fuel concentration combustion - Google Patents

Abstract

PURPOSE:To reduce the number of parts and simplify the structure so as to realize easy assembly operation by integrating a plurality of thick fuel mixing parts and thin fuel mixing parts into a unit by use of a bottomed casing of a rectangular section shape. CONSTITUTION:A casing K containing a thick fuel mixing part A and a thin fuel mixing part B, a thick fuel gas supply pipe 3 and a thin fuel gas supply pipe 4 are provided in the interior of a bottomed tubular cylinder R which forms a combustion chamber of a combustion apparatus for thick and thin fuel concentration combustion. A bottom plate 5 of the easing K is provided with a supply port 5a for thick fuel mixing and a supply port 5b for thin fuel mixing. Under the bottom plate 5, the thick fuel gas supply pipe 3 having injection nozzles 3a capable of injecting the fuel gas toward the supply port 5a for the thick fuel mixing and two thin fuel gas supply pipes 4 having injection nozzles 4b capable of injecting the fuel gas at the supply port 5b for the thin fuel mixing are disposed. Thus, hot water supply apparatus and the like are easily mounted on the easing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a flat dense mixing portion for producing a rich mixture having a small primary air suction ratio and a light mixing portion having a large primary air suction ratio, which are alternately arranged. The present invention relates to a rich / lean combustion device having a rich mixing flame port formed on an upper surface of a rich mixing unit and a light mixing flame port formed on an upper surface of the light mixing unit.

[0002]

2. Description of the Related Art Such a rich / lean combustion apparatus is equipped in a water heater or the like as a heat source, and has an advantage that good combustion can be achieved while reducing NO _x . Conventionally, in this type of rich-lean burner, a plurality of rich-blending sections and a plurality of lean-blending sections are separately formed, and the deep-blending section and the light-blending section that are separately formed are used in a device such as a water heater. It was designed to be assembled separately in the casing. It should be noted that a plurality of fuel gas supply pipes having an ejection portion are provided in a state corresponding to each of the rich mixing portion and the light mixing portion, and a blower fan that blows combustion air is provided.

[0003]

However, according to the above-mentioned prior art, the more the rich mixing section and the light mixing section are provided, the more the number of parts increases, and the structure becomes complicated. There was an inconvenience that the assembly became complicated. An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[0004]

The first characteristic structure of the rich-lean combustion device according to the present invention is a state in which a plurality of flat rectangular tubular bodies are arranged at intervals inside a casing having a rectangular tubular shape with a bottom. The dense mixing portion is formed by the rectangular tubular body,
Further, the light mixing portion is formed in a space surrounded by the side walls of the rectangular tubular body and the casing that are adjacent to each other, and the bottom plate of the casing corresponds to the deep mixing portion and the light mixing portion, respectively. Supply port for deep mixing and supply port for light mixing
It is formed in a state where the opening area of the supply port for light mixing is made larger than the opening area of the supply port for deep mixing, and blows combustion air and cooling air toward the outer peripheral portion of the bottom plate and the casing. And a fuel gas supply pipe for rich mixing, which is provided with an ejection portion for ejecting the fuel gas toward the rich mixing supply port, and the fuel gas toward the light mixing supply port. A fuel gas supply pipe for light mixing having a jetting portion for jetting is provided.

A second characteristic configuration of the rich-lean combustion device according to the present invention specifies a preferred specific configuration for carrying out the first characteristic configuration. Both sides of the rectangular tubular body are provided on the side wall of the casing. A holding portion that locks and holds the lateral end portion is formed, and a holding portion that locks and holds the bottom portion of the rectangular tubular body is formed on the bottom plate of the casing.

[0006]

According to the first characteristic configuration of the present invention, since the plurality of dense mixing portions and the plurality of light mixing portions are unitized by the bottomed rectangular tubular casing, the casing of an apparatus such as a water heater is provided. When assembling, the unit should be assembled. Moreover, by utilizing the side wall of the bottomed rectangular tubular casing, by arranging the rectangular tubular bodies at a distance in the casing, the two types of mixing portions are configured, thus reducing the number of parts, Both types of mixed parts can be formed. Furthermore, since the bottom plate of the bottomed rectangular tubular casing is used to configure both types of supply ports for supplying combustion air suitable for both types of mixing parts, from this point as well, While reducing the number, it becomes possible to supply the proper combustion air to the mixing section of both types.

According to the second characteristic configuration, the side wall and the bottom plate of the casing are formed with the holding portions for locking and holding the rectangular tubular bodies. Therefore, a plurality of flat rectangular tubular bodies are arranged at intervals. It can be accommodated properly in a state of being arranged side by side, and moreover, the structure can be simplified more easily than in the case where the distance is regulated by using other means such as a spacer.

[0008]

According to the first characteristic construction of the present invention, since the plurality of rich mixing portions and the plurality of light mixing portions are unitized, it becomes easy to assemble them into the casing of a device such as a water heater. In addition, by effectively utilizing a bottomed rectangular tubular casing for unitization, it is possible to form a mixing section for both types while reducing the number of parts and simplifying the structure. While improving the workability of assembling to the device, it has come to provide a rich-lean combustion device with reduced manufacturing cost.

According to the second characteristic constitution, with a simple constitution,
It is possible to accurately store a plurality of flat rectangular tubular bodies in a state of being arranged at intervals, and in addition to the effect of the above-mentioned first characteristic configuration, a rich-lean combustion device that can be used more conveniently Can be provided.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1, FIG. 2, and FIG. 3, a flat-shaped rich mixing portion A for generating a rich air-fuel mixture having a small primary air suction ratio and a light mixing portion B having a large primary air suction ratio are alternately arranged. A rich / lean combustion device is shown in which the rich mixing flame port 1 is formed on the upper surface of the rich mixing portion A and the light mixing flame port 2 is formed on the upper surface of the light mixing portion B.

The rich / lean combustion device maintains the ignitability and the flame holding effect by the rich flame, and at the same time, burns a desired amount of combustion in a state where the combustion temperature is lowered by the lean flame, and thereby NO _x ( This is a combustion device capable of performing combustion with the generation of nitrogen oxides reduced as much as possible.

The rich / lean burner in this embodiment is composed of a so-called Bunsen burner. The rich mixing section A and the light mixing section B are housed in a casing K in the shape of a square cylinder with a bottom arranged alternately. The rich flame is above the flame port 1 provided in the rich mixing section A, and the lean flame is the lean mixing section B.
Are formed above the flame nozzles 2 provided in the respective. The casing K includes a bottom plate 5, a burner fixing plate 6 as a side wall of the casing K, and a side plate 7. In the bottom plate 5 of the casing K, there are provided a rich mixing supply port 5a and a light mixing supply port 5b corresponding to the rich mixing part A and the light mixing part B, respectively, and an opening area of the light mixing supply port 5b. Is larger than the opening area of the supply port 5a for dense mixing. Below the bottom plate 5, a supply port 5a for deep mixing is provided.
Of concentrated fuel gas for dense mixing, which is provided with an ejection nozzle 3a as an ejecting portion for ejecting fuel gas toward the air, and ejection as an ejecting portion for ejecting fuel gas toward the supply port 5b for light mixing Two light fuel gas supply pipes 4 for light mixing provided with nozzles 4b are provided. Therefore, the supply port 5a and the supply port 5 are provided to the dense mixing section A and the light mixing section B, respectively.
The fuel gas is blown through b, and the primary combustion air is sucked with it.

The casing K for accommodating the rich mixing portion A and the light mixing portion B, and the rich fuel gas supply pipe 3 and the light fuel gas supply pipe 4 are in the shape of a bottomed rectangular tube forming the combustion chamber of the rich and lean combustion device. It is provided inside the barrel R. At the outer peripheral portion of the casing K, a gap 8 is formed by the barrel R and the casing K.
Are formed. The gap 8 is configured to have the effect of cooling the casing K by the flow of the cooling air and blocking the heat from the casing K with respect to the barrel R.

At the bottom of the barrel R, a blower fan 9 for blowing combustion air and cooling air toward the bottom plate 5 and the gap 8.
Fan outlet 9a is provided. Fan outlet 9
In a, the flow velocity distribution of the discharge air is made more uniform,
An air rectifying plate 10 for blowing an equal amount of air is provided to each part inside. The air conditioning plate 10 is made of punching metal or the like. Further, the air conditioning plate 10 is generally configured so that the opening area for the ventilation air is as large as possible so as not to hinder the air blowing effect of the air blowing fan 9 while exhibiting the air conditioning effect. By narrowing the area or providing multiple air conditioning boards 10,
The air conditioning effect and the air blowing effect of the air blowing fan 9 can be adjusted.

FIG. 2 shows two dense mixing sections A and the two
The light mixing section B formed between the dense mixing sections A of the sheet is shown. The rich mixing portion A is composed of a flat rectangular tubular body a. In the lower part of the rectangular tubular body a, a vertically long rectangular tubular inlet portion 11 is formed for supplying fuel gas and primary air for combustion. The inlet portion 11 is configured to be located above the air supply port 5a formed in the bottom plate 5 of the casing K when the rectangular tubular body a is housed in the casing K. A flat rectangular tube-shaped mixing portion 12 is formed on an upper portion of the inlet portion 11. In the mixing section 12, the fuel gas and the primary air for combustion are mixed. At the center of the mixing section 12, there is provided a throttle section 13 for making the distribution of the air-fuel mixture in the mixing section 12 more uniform.

A flame port 1 for a rich air-fuel mixture is formed on the upper surface of the rectangular tubular body a. In this embodiment, the flame port 1 is composed of a set of three elliptical flame holes 1a, and eleven flame ports 1 are provided at an appropriate pitch for each rectangular tubular body a. Therefore, the fuel gas and the primary air for combustion that have been supplied to the inlet portion 11 through the air supply port 5a rise in the inlet portion 11, are mixed and diffused in the mixing portion 12, and are discharged from the flame outlet 1. Forms a rich flame.

A rectifying plate 14 for a light mixing section B, which will be described later, is provided on both sides of the upper portion of the rectangular tubular body a. or,
At both ends of the upper surface of the rectangular tubular body a, blocking pieces 15 for blocking the direct blowing of the cooling air into the rich flame formed in the flame ports 1 located at the both ends are provided. Blocking piece 1
5 prevents unnecessary excess air in the rich flame located at the end, stabilizes the combustion state, and reduces CO in the exhaust gas. In this embodiment, the current plate 1
4 and the blocking piece 15 are integrally formed, and are fixed to the rectangular tubular body a at the side end portions of the rectangular tubular body a.

In the light mixing section B, as shown in FIG. 3, a plurality of rectangular tubular bodies a are housed in a casing K in a state in which they are spaced at regular intervals. Formed during. The air supply port 5b formed in the bottom plate 5 of the casing K is provided so as to be located between the rectangular tubular bodies a. Therefore, the fuel gas and the primary air for combustion supplied from the air supply port 5b rise in the light mixing section B while being mixed and diffused in the light mixing section B, and are provided above the light mixing section B. After being rectified by the rectifying plate 14 existing therein, it is discharged from the flame mixture port 2 for the light mixture formed between the upper surfaces of the two rectangular tubular bodies a to form a light flame.

The current plate 14 is a rectangular tubular body a located on both sides.
Both of the above are attached, so that one light mixing section B is provided with two straightening vanes 14. Light mixing section B
In the above, the rectifying plate 14 promotes the mixing of the fuel gas and the primary air for combustion, and prevents the flashback at the time of low input,
In addition, it is configured to have a flame holding effect of light flame. The upper end of the current plate 14 is the upper surface of the rectangular tubular body a, or
It is formed at the same height as the flame port 2 of the light mixing portion B. The vertical width of the rectifying plate 14 promotes the mixing of the fuel gas and the primary air for combustion in a state where the flow resistance of the air-fuel mixture does not unnecessarily increase, and reduces the noise when the lean flame is burned. Is adjusted and formed.

A plurality of convex portions 14a are formed on the straightening vane 14 so as to abut against the rectangular tubular body a and the other straightening vane 14 so that the space between the rectangular tubular body a and the straightening vane 14 is abutted. Interval of
In addition, it is configured to maintain the space between the straightening vanes 14. The distance between the rectangular tubular body a and the rectifying plate 14 and the distance between the rectifying plates 14 are adjusted to dimensions effective for the rectifying plate 14 to exert a quenching effect (cooling effect) in a lean flame. ing.

FIG. 4 shows a plan view of the casing K. The casing K includes a bottom plate 5, two burner fixing plates 6 and two side plates 7. The burner fixing plate 6 fixes a plurality of rectangular tubular bodies a in parallel at equal intervals, and at the same time constitutes a side end plate of the light mixing section B.
5 is a front view of the burner fixing plate 6, FIG. 6 is a side view of the burner fixing plate 6, FIG. 7 is a plan view of the burner fixing plate 6, and FIG. 8 is a bottom view of the burner fixing plate 6. The figure is shown. A bent portion 6a is formed on the upper portion of the burner fixing plate 6 as a holding portion that holds both lateral end portions of the rectangular tubular body a. The bent portion 6a is formed with a plurality of cut portions 6b into which the side ends of the rectangular tubular body a are fitted. The upper bent portion 6a is configured so as to close the end portion of the flame port 2 of the light mixing portion B, and the light flame is not formed at the end portion of the light mixing portion B. On the surface of the burner fixing plate 6 located on the inner side of the casing K, a retaining support piece 6c that engages with a notch 16 formed at the side end of the rectangular tubular body a.
Is provided. On the surface of the burner fixing plate 6 located on the outer side of the casing K, a spacer 6d for holding a gap 8 between the burner fixing plate 6 and the barrel R is provided. The burner fixing plate 6 is fixed to the bottom plate 5.

The side plate 7 prevents the fuel gas and combustion air supplied to the light mixing section B from leaking out of the casing K,
Moreover, it is provided so as to form a gap 8 with the barrel R. 9 is a front view of the side plate 7, FIG. 10 is a side view of the side plate 7, and FIG. 11 is a plan view of the side plate 7.
A bent portion 7a is formed on the upper portion of the side plate 7. The shape and size of the bent portion 7a are configured to reinforce the shape retention force of the side plate 7. The side plate 7 is the burner fixing plate 6
Fixed to.

The bottom plate 5 is constructed so as to support the rectangular tubular body a, and the supply port 5a for deep mixing and the supply port 5 for light mixing are provided.
b is provided. 12 is a plan view of the bottom plate 5, FIG. 13 is a side view of the bottom plate 5, and FIG. 14 is a front view of the bottom plate 5. The shapes and sizes of the supply ports 5a and 5b are adjusted so that the suction ratio of the primary air for combustion becomes appropriate in the rich mixing section A and the light mixing section B, respectively. Therefore, the opening area of the supply port 5b is larger than the opening area of the supply port 5a for dense mixing. Further, in the present embodiment, the plurality of supply ports 5a or the plurality of supply ports 5b are all formed to have the same shape and size, but, for example, when the air blowing state by the air blowing fan 9 is not uniform in the barrel R. In order to make the suction ratio of the combustion primary air in the plurality of rich mixing portions A or the plurality of light mixing portions B constant, the shape and size of the supply port 5a or the supply port 5b can be made different. is there.

A plurality of holes 5c for supplying cooling air to the gap 8 are provided in the peripheral edge portion of the bottom plate 5. The size and number of the holes 5c are such that an appropriate cooling air is supplied to appropriately cool the casing K, and the heat from the casing K is shielded, and a heat exchanger is provided above the barrel R. When provided, it is adjusted to ensure a sufficient amount of air to prevent condensation on the heat exchanger. The shape of the hole 5c can be changed as appropriate.

At a portion of the bottom plate 5 along the supply port 5a, a fixing metal fitting 1 as a holding portion for locking and holding the bottom portion of the rectangular tubular body a.
7 is welded and provided. The fixing member 17 is configured to position the rectangular tubular body a in the casing K together with the bent portion 6a of the burner fixing plate 6.
The fixing metal fitting 17 is provided with a plurality of cutouts 17a into which the lower end of the rectangular tubular body a fits, similarly to the cutouts 6b provided in the bent portion 6a.

As shown in FIG. 13, foot portions 5d are formed on both sides of the bottom plate 5, and the rich fuel gas supply pipe 3 and the light fuel gas supply pipe 4 are penetrated and fixed to the foot portions 5d. A hole 5e and a hole 5f are provided. The bottom plate 5 is fixed to the barrel R.

FIG. 15 shows the rich fuel gas supply pipe 3. The rich fuel gas supply pipe 3 is composed of, for example, a brass pipe, a stainless pipe, an aluminum die cast pipe, or the like. A plurality of ejection nozzles 3 a are provided in a row on the pipe wall of the rich fuel gas supply pipe 3. The ejection nozzle 3a is composed of a hole formed in the tube wall. The size and shape of the ejection nozzle 3a are adjusted according to the type of fuel gas. Both ends of the rich fuel gas supply pipe 3 are open, and a supply port 3b and a supply port 3c for taking in the fuel gas are formed in the rich fuel gas supply pipe 3, respectively. The inside of the rich fuel gas supply pipe 3 is divided into left and right by a partition plate 3d.
Therefore, when the fuel is supplied only from the supply port 3b,
When the fuel is supplied only from the supply port 3c,
By switching to a state in which fuel is supplied from both b and the supply port 3c, the number of the rich mixing portions A in which rich flame is formed can be adjusted in three stages.

FIG. 16 shows the fresh fuel gas supply pipe 4. The light fuel gas supply pipe 4 is made thinner than the rich fuel gas supply pipe 3. A plurality of ejection nozzles 4 a are also provided in a row on the pipe wall of the light fuel gas supply pipe 4. The ejection direction of the ejection nozzle 4a is adjusted to adjust the distribution of the lean flame in the lean mixing section B, the mixed state of the fuel gas and the primary air for combustion, the amount of CO generated in the exhaust gas, and the like. The end portion of the light fuel gas supply pipe 4 is formed with a supply port 4b for taking in the fuel gas on one side and closed on the other side.

The mounting height of the rich fuel gas supply pipe 3 and the light fuel gas supply pipe 4 is adjusted by the distance to the bottom plate 5 of the casing K so as to adjust the suction ratio of the rich flame and the lean flame. .

FIG. 17 shows a route diagram of a route for supplying the fuel gas to the rich fuel gas supply pipe 3 and the light fuel gas supply pipe 4. Fuel gas is supplied from the path W1. The safety valve 18 and the solenoid proportional valve 1 are provided in the path W1.
9 is provided. The route W1 is
It branches into a route W2 and a route W3. The path W2 is connected to the supply port 3b of the rich fuel gas supply pipe 3. Route W
2 is provided with an interrupting valve 20 that disconnects the supply of the fuel gas to the supply port 3b. The route W3 is branched into a route W4 and a route W5 by a branch D2. Route W4
Is connected to the supply port 3c of the rich fuel gas supply pipe 3. The path W4 is provided with an interrupting valve 21 that interrupts the supply of the fuel gas to the supply port 3c. The passage W5 is provided with an interrupting valve 22 that interrupts the supply of the fuel gas to the fresh fuel gas supply pipe 4. Route W5 is branch D
3 branches into a route W6 and a route W7. The route W6 and the route W7 are provided on the supply port 4b of the fresh fuel gas supply pipe 4.
Connected to each.

FIG. 18 shows a portion constituting a fuel gas supply path in the present rich / lean combustion device. A path W1 is formed in the joint portion 23, and a safety valve 18 and an electromagnetic proportional valve 19 are provided. A branch D1 is formed in the joint portion 24, the path W1, the path W2, and the path W3 are connected to each other, and the disconnection valve 20 is provided. A path W2 and a supply port 3b are formed in the joint portion 25. Branches D2 and D3 are formed in the joint portion 26, and the paths W4, W5, W6, and W are provided.
7, the supply port 3c and the supply port 4b are formed, and the intermittent valve 21 and the intermittent valve 22 are provided.

In FIG. 19, the joint portion 23 and the joint portion 2 are shown.
4 and a cross-sectional view of the joint portion 26 is shown. Intermittent valve 20, interrupt valve 21, and interrupt valve 22
Is a solenoid valve.

Further, as shown in FIGS. 17, 18 and 19, the narrowing means for changing and adjusting the flow rate of the fuel gas to the jet nozzle 3a of the rich fuel gas supply pipe 3 is provided in the passage W2 and the passage W4. Replaceable orifice 2 as
7 is provided. The shape and size of the orifice 27 are adjusted or selected according to the type of fuel gas.

FIGS. 20A and 20B show the input amount Ip of the combustion device in the combustion control of the rich / lean combustion device.
And the supply amount G of the fuel gas to the rich mixing portion A or the light mixing portion B are shown. The supply amount G of the fuel gas to the rich mixing portion A is shown by the line g1. Light mixing section B
The supply amount G of the fuel gas with respect to is shown by the line g2. The combustion control of the rich-lean combustion device is such that when the input amount Ip is lower than the predetermined value Is, only the rich mixing section A is burned, and when the input amount Ip is higher than the predetermined value Is,
Both the rich mixing section A and the light mixing section B are burnt, so that dark and light combustion is performed. The input amount I
The increase / decrease of p is adjusted by the solenoid proportional valve 19.

FIG. 20A shows a control mode of the fuel gas supply amount G when the type of fuel gas is, for example, LPG or 13A. FIG. 20A shows a control mode of the fuel gas supply amount G when the type of fuel gas is, for example, 6C or 5C. The control shown in FIG. 20 (a) is configured so that the distribution ratio of the fuel gas to the light mixing section B becomes lower than that in the control shown in FIG. 20 (a).

The control shown in FIG. 20A and FIG.
The switching to the control shown in (a) is performed by the orifice 27.
Can be performed by exchanging the orifices 27 having different shapes or sizes. Therefore, the orifice 2
7 changes the distribution ratio of the fuel gas between the rich mixing section A and the light mixing section B. That is, the flow rate of the fuel gas to the rich mixing portion A and the slope of the flow rate of the fuel gas to the rich mixing portion A with respect to the increase or decrease of the input amount Ip are adjusted.

In the rich / lean combustion device of the present embodiment, the orifice 27 can determine the gas amount ratio of the fuel gas between the rich mixing portion A and the light mixing portion B for each kind of fuel gas. That is, high WI LPG-1
With gas types such as 3A, the maximum flame temperature is high, and the generated NO
_{Since the} amount of _X is large, it is possible to easily raise the ratio of the light air-fuel mixture and lower the NO _X value to a level as low as WI. or,
In the case of low WI gas types such as 6C and 5C, N is originally
Since O _X amount is low, no problems by lowering the ratio of light mixture, it is possible to take a backfire protection by reducing the ratio. As described above, by providing the orifice 27, it is possible to easily take an appropriate combustion mode suitable for the properties of each gas.

[Other Embodiments] The orifice 27 may be provided in one or both of the rich fuel gas supply pipe 3 and the light fuel gas supply pipe 4. FIG. 21 shows another embodiment of the present rich and thin combustion device. In FIG. 21, the orifice 27
Is provided on the route W5.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a perspective view showing the overall structure of a rich-lean combustion device.

FIG. 2 is a perspective view showing a deep mixing section and a light mixing section.

FIG. 3 is a cross-sectional view showing a deep mixing portion and a light mixing portion.

FIG. 4 is a plan view showing a casing.

FIG. 5 is a front view showing a burner fixing plate.

FIG. 6 is a side view showing a burner fixing plate.

FIG. 7 is a top view showing a burner fixing plate.

FIG. 8 is a bottom view showing the burner fixing plate.

FIG. 9 is a front view showing a side plate.

FIG. 10 is a side view showing a side plate.

FIG. 11 is a plan view showing a side plate.

FIG. 12 is a plan view showing a bottom plate.

FIG. 13 is a side view showing a bottom plate.

FIG. 14 is a front view showing a bottom plate.

FIG. 15 is a sectional view showing a rich fuel gas supply pipe.

FIG. 16 is a sectional view showing a fresh fuel gas supply pipe.

FIG. 17 is a route diagram showing a fuel gas supply route.

FIG. 18 is an exploded perspective view showing the configuration of a fuel gas supply path.

FIG. 19 is a sectional view showing a fuel gas supply path.

FIG. 20 is a graph showing combustion control.

FIG. 21 is a route diagram showing a fuel gas supply route according to another embodiment.

[Explanation of symbols]

 A dense mixing part B light mixing part K casing a square tubular body 1 rich mixing flame port 2 light mixing flame port 3 rich fuel gas supply pipe 3a ejection nozzle 4 lean fuel gas supply pipe 4a ejection nozzle 5 bottom plate 5a supply port 5b Supply port 6 Side wall 6a Holding part 7 Side wall 9 Blower means 17 Holding part

Claims (2)

[Claims] 1. A flat dense mixing section (A) for producing a concentrated air-fuel mixture having a small primary air suction ratio and a light mixing section (B) having a large primary air suction ratio are alternately arranged. A rich / lean combustion apparatus having a rich mixing flame port (1) formed on an upper surface of a rich mixing section (A) and a light mixing flame port (2) formed on an upper surface of the light mixing section (B). A plurality of flat rectangular tubular bodies (a) are housed in a bottomed rectangular tubular casing (K) in a state of being arranged side by side, and the dense mixing is performed in the rectangular tubular body (a). The part (A) is formed, and the light mixing part (B) is formed in a space surrounded by the side walls (6, 7) of the rectangular tubular body (a) and the casing (K) which are adjacent to each other. The bottom plate (5) of the casing (K) is provided with a feed port (5a) for deep mixing corresponding to each of the rich mixing part (A) and the light mixing part (B). The supply port (5b) for mixing is
It is formed such that the opening area of the light mixing supply port (5b) is larger than the opening area of the rich mixing supply port (5a), and the outer peripheral portion of the bottom plate (5) and the casing (K). Blower means (9) for blowing cooling air toward the exhaust gas, and a fuel gas for rich mixing provided with an ejection part (3a) for ejecting fuel gas toward the supply port (5a) for rich mixing. A supply pipe (3) and a fuel gas supply pipe (4) for light mixing provided with an ejection portion (4a) for ejecting fuel gas toward the light mixing supply port (5b) are provided. Density combustion device. 2. A side wall (6) of the casing (K),
A holding portion (6a) for locking and holding both lateral end portions of the rectangular tubular body (a) is formed, and a bottom plate (5) of the casing (K) holds the bottom portion of the rectangular tubular body (a). 2. The rich / lean combustion device according to claim 1, wherein a holding portion (17) for locking and holding is formed.