JPH11248148A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the manufacture of a large size combustion device by a method wherein an opening and closing valve, interposed in a fuel supplying pipe connected to a main mixing chamber having a surface combustion plate near an igniting means, is opened upon starting combustion and, thereafter, another opening and closing valve, interposed in another fuel supplying pipe connected to a sub mixing chamber, is opened. SOLUTION: After 9 seconds, for example, from stating an electric discharge igniting device 21, an opening and closing valve 10 is opened to start the supply of fuel gas into a main mixing chamber 1 and the fuel gas is mixed in a main mixing chamber 1 into combustion air supplied by a fan 14 to form a flame 24 on the surface of a surface combustion plate 17. Subsequently, another opening and closing valve 11 is opened and another fan 15 is operated through rated operation to mix fuel gas into combustion air supplied from another fan 15 in a sub mixing chamber 2 to form another flame 25 on the surface of another surface combustion plate 18. Further, the other opening and closing valve 12 is opened and the other fan 16 is operated through rated operation to mix fuel gas into combustion air, supplied by the after fan 16, in the other sub mixing chamber 3 to form the other flame 26 on the surface of the other surface combustion plate 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus, and more particularly to a method of mixing a fuel and combustion air with each other, passing through a myriad of fine holes in a surface combustion plate, and burning the mixture on the surface. The present invention relates to a combustion device that completes combustion in a short time.

[0002]

2. Description of the Related Art As this type of combustion apparatus, as shown in FIG. 4, a fuel supply pipe 52 is connected to a mixing chamber 51, and a blower 53 for supplying combustion air to the mixing chamber 51 is installed. Surface combustion plate 54 provided in front of chamber 51
Combustion device for passing a mixed gas of fuel gas and combustion air mixed in the mixing chamber 51 through innumerable fine holes (not shown) to form a flame 55 on the surface of the mixed gas and burn the mixed gas. Is well known.

Reference numeral 56 denotes an ignition means provided with a discharge mechanism or the like and provided in front of the surface combustion plate 54. The mixed gas in the mixing chamber 51 passing through the surface combustion plate 54 is ignited by the ignition means 56. A flame 55 is formed.

[0004] The combustion apparatus having the above-described structure has an advantage that the flame 55 is formed short, so that the apparatus can be downsized when used as a heating means for a boiler or the like. Further, since combustion is completed in a short time, there is also an advantage that generation is said that suppressing of the NO _X in the exhaust gas, it has applications spreading.

[0005]

However, in the conventional combustion apparatus having the above-described structure, it is difficult to increase the size of the surface combustion plate made of ceramics or the like because of limitations in strength and processing. However, there is a problem that it is difficult to manufacture this, and solving this problem has been an issue.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of mixing chambers in which fuel supply pipes having an on-off valve are connected one by one, and is installed in correspondence with each mixing chamber.
A plurality of blowers for supplying combustion air to the mixing chamber, a plurality of surface combustion plates provided in each mixing chamber, for passing a mixed gas in the mixing chamber, and forming a flame on the surface thereof, and one surface combustion plate At the start of combustion, is interposed in a fuel supply pipe connected to a mixing chamber having a surface combustion plate close to the ignition means (hereinafter referred to as a main mixing chamber). The on-off valve is opened, the ignition means is activated to form a flame on the surface of the surface combustion plate of the main mixing chamber, and then connected to a mixing chamber other than the main mixing chamber (hereinafter referred to as a sub-mixing chamber). Control to open the on-off valve interposed in the fuel supply pipe and to ignite the gas that has passed through the surface combustion plate of the sub-mixing chamber and exited from the sub-mixing chamber from the flame formed on the surface of the surface combustion plate of the main mixing chamber Like a bowl A combustion device of the first configuration has,

[0007] In the combustion apparatus of the first configuration, the on-off valve interposed in the fuel supply pipe connected to the sub-mixing chamber is placed ahead of the on-off valve interposed in the fuel supply pipe connected to the main mixing chamber by the controller. A combustion device of a second configuration that closes the valve;

In the combustion device of the first configuration, even when a flame is formed only on the surface of the surface combustion plate of the main mixing chamber, the blower for supplying combustion air to the sub-mixing chamber is operated by the controller. A third configuration combustion device,

A fourth aspect of the present invention provides the combustion apparatus of the third configuration, wherein a blower for supplying combustion air to the sub-mixing chamber is operated at a low speed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a combustion apparatus according to the present invention will be described below with reference to FIGS.

On both sides of the main mixing chamber 1, sub mixing chambers 2 and 3 are provided side by side, and a gas chamber 4 having a small volume is provided below the main mixing chamber 1.

Each of the chambers 1 to 4 is connected one by one to branch fuel supply pipes 6 to 9 branched from the main fuel supply pipe 5. Each of the branch fuel supply pipes 6 to 9 has an on-off valve 10-1.
3 are provided one by one so that fuel gas can be supplied individually. The branch fuel supply pipe 9 connected to the gas chamber 4 is thinner than the other branch fuel supply pipes 6 to 8, and the on-off valve 13 interposed therein is also smaller than the other on-off valves 10 to 12.

The mixing chambers 1 to 3 have blowers 14 to 1 respectively.
6 are provided so that combustion air can be appropriately supplied to each of them. In addition, surface combustion plates 17 to 20, which allow gas to pass therethrough and form a flame on the surface thereof, are provided in front of the respective chambers 1 to 4. In addition, mixing chambers 1-3
Surface combustion plates 17 to 19 installed in front of
Is the largest of three commercially available surface combustion plates.
It is formed by bonding about 5 sheets.

Further, a discharge ignition device 21 is installed in front of the surface combustion plate 20, and a controller 22 for controlling these devices as shown in FIG. 3 is provided.

That is, when a combustion switch (not shown) is turned on, the controller 22 first starts the blowers 14 to 16. At this time, the blower 14 performs a rated operation to feed a required amount of combustion air into the main mixing chamber 1.
Is operated at a predetermined low-speed operation, for example, 5 to 10% of the rating,
After passing through the surface combustion plates 18 and 19, the sub-mixing chambers 2.3
Create a weak airflow that goes out of the room.

After a predetermined time, for example, 30 seconds, the on-off valve 13 is opened to start supplying fuel gas from the branch fuel supply pipe 9 to the gas chamber 4, and at the same time, the discharge ignition device 21 is turned on for a predetermined time, for example, 5 seconds. Starting for only a second, the fuel gas passing through the surface combustion plate 20 and coming out of the gas chamber 4 is ignited, and a pilot flame 23 is formed on the surface of the surface combustion plate 20.

After a further predetermined time, for example, the discharge ignition device 2
Nine seconds after the start of the fuel cell 1, the on-off valve 10 is opened to start supplying the fuel gas from the branch fuel supply pipe 6 to the main mixing chamber 1, and the combustion air supplied by the blower 14 and the main mixing chamber 1 The mixed gas that has passed through the surface combustion plate 17 and exited from the main mixing chamber 1 is ignited from the pilot flame 23 to form a flame 24 on the surface of the surface combustion plate 17. A predetermined time after the formation of the flame 24, for example, eight seconds later, the on-off valve 13 is closed to extinguish the pilot flame 23.

If the heat generated by the flame 24 formed on the surface of the surface combustion plate 17 of the main mixing chamber 1 is insufficient due to the increased combustion load, for example, the on-off valve 11 is opened and the blower 15 is rated. In operation, the fuel gas and the combustion air supplied from the blower 15 are mixed in the sub-mixing chamber 2, and the mixed gas that has passed through the surface combustion plate 18 and exited from the sub-mixing chamber 2 is ignited from the flame 24. Thus, a flame 25 is formed on the surface of the surface combustion plate 18.

When the combustion load further increases, the opening and closing valve 12 and the rated operation of the blower 16 are performed, and the fuel gas and the combustion air supplied from the blower 16 are mixed in the sub-mixing chamber 3, and The mixed gas passing through the combustion plate 19 and coming out of the sub-mixing chamber 3 is ignited from the flame 24 to form a flame 26 on the surface of the surface combustion plate 19.

On the other hand, when the combustion load decreases, first, the on-off valve 12 is closed to stop the supply of the fuel gas from the branch fuel supply pipe 8 to the sub-mixing chamber 3, and the blower 16 is operated in the initial operating state. That is, the operation is performed at, for example, 5 to 10% of the rating, and the flame 26 is extinguished.

When the combustion load further decreases, the on-off valve 11 is closed to stop the supply of the fuel gas from the branch fuel supply pipe 7 to the sub-mixing chamber 2, and the blower 15 is operated in the initial operating state. That is, for example, the operation is performed at 5 to 10% of the rating, and the flame 25 is extinguished.

When the combustion stop switch is operated, the on-off valve 10 is closed to stop the supply of fuel gas from the branch fuel supply pipe 6 to the main mixing chamber 1, and after a predetermined time, for example, After 20 seconds, the operation of the blowers 14 to 16 is stopped.

As described above, the combustion apparatus of the present invention has a large capacity by arranging the mixing chamber having the surface combustion plate in parallel as described above. Although difficult, it is easy to increase the size of the device.

In addition, since the control is performed by the controller 22 as described above, even when the flame 24 is formed only on the surface of the surface combustion plate 14, the sub-mixing chamber 2.
3 is supplied with air for combustion by blowers 15 and 16 and passes through the surface combustion plates 18 and 19 to the sub-mixing chamber 2.
A weak airflow is generated that flows out of the combustion chamber 3 to the outside, and the high-temperature combustion gas generated by the flame 24 does not flow back to the sub-mixing chambers 2.3.

Therefore, there is no case where the high-temperature combustion gas touches the low-temperature portions such as the sub-mixing chambers 2 and 3 to form dew.

The flame 24 is formed first, and
Since it is formed to the end, when it is necessary to detect a flame, it is sufficient to install a required flame detector only on the front surface of the surface combustion plate 17 of the main mixing chamber 1, thereby simplifying the apparatus.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

For example, a plurality of sub-mixing chambers may be provided on both sides of the main mixing chamber 1, and a branch fuel supply pipe, a surface combustion plate, a blower, etc. may be attached to each.

It is also possible to adopt a configuration in which the mixed gas that has passed through the surface combustion plate 17 and has come out of the main mixing chamber 1 is directly ignited from the discharge ignition device 21 or the like.

In a state where the flames 24, 25 and 26 are formed, when the combustion load is reduced, the flame 25 may be controlled to be extinguished first.

[0031]

According to the combustion apparatus of the present invention as described above, according to the present invention, the combustion apparatus the flame using the surface combustion plate generation can be suppressed of the NO _X in the size and in the exhaust gas of the apparatus to be shorter Capacity can be easily increased.

In particular, in the combustion apparatus according to the second aspect, the mixed gas that has passed through the surface combustion plate of the main mixing chamber burns first and continues to burn to the end. Since it is sufficient to perform the operation only on the front surface of the surface combustion plate in the main mixing chamber, the configuration of the apparatus is simplified.

Further, in the combustion apparatus of the third aspect, since the high-temperature combustion gas does not flow backward into the sub-mixing chamber, the high-temperature combustion gas contacts the low-temperature portion of the sub-mixing chamber to form dew. Nothing.

Further, in the combustion apparatus according to the fifth aspect, since a part of the blower is operated at a low speed when performing partial combustion, energy can be saved.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a combustion device viewed from above.

FIG. 2 is an explanatory diagram of the combustion device as viewed from the front.

FIG. 3 is an explanatory diagram showing control during combustion.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main mixing chamber 2.3 Sub mixing chamber 4 Gas chamber 5 Main fuel supply pipe 6-9 Branch fuel supply pipe 10-13 On-off valve 14-16 Blower 17-20 Surface combustion plate 21 Discharge igniter 22 Controller 23 24-26 fire

Claims (4)

[Claims] 1. A plurality of mixing chambers each having a fuel supply pipe connected with an on-off valve connected thereto one by one, and a plurality of blowers installed corresponding to each of the mixing chambers and supplying combustion air to the mixing chambers. A combustion device provided with a plurality of surface combustion plates provided in each mixing chamber and passing a mixed gas in the mixing chamber to form a flame on the surface thereof, and ignition means provided near one surface combustion plate. At the start of combustion, an opening / closing valve interposed in a fuel supply pipe connected to a mixing chamber having a surface combustion plate close to the ignition means (hereinafter, referred to as a main mixing chamber) is opened, and the ignition means is started to activate the ignition means. A flame is formed on the surface of the surface combustion plate of the mixing chamber, and thereafter, an on-off valve interposed in a fuel supply pipe connected to a mixing chamber other than the main mixing chamber (hereinafter referred to as a sub-mixing chamber) is opened, Passing through the surface combustion plate in the sub-mixing chamber Combustion apparatus characterized in that a controller for igniting the Te sub from the mixing chamber to the gas exiting formed on the surface combustion plate surface of the main mixing chamber flame. 2. The on-off valve interposed in the fuel supply pipe connected to the sub-mixing chamber is closed before the on-off valve interposed in the fuel supply pipe connected to the main mixing chamber by the controller. The combustion device according to claim 1, wherein 3. A blower for supplying air for combustion to the sub-mixing chamber even when a flame is formed only on the surface of the surface combustion plate of the main mixing chamber. Item 2. The combustion device according to Item 1. 4. The combustion apparatus according to claim 3, wherein a blower for supplying combustion air to the sub-mixing chamber is operated at a low speed.