JP3509945B2 - Combined combustor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite combustor having a hot water supply burner and a burner having a function other than hot water supply.

[0002]

2. Description of the Related Art FIG. 6 shows the structure of a conventional general composite combustor. In FIG. 1, the appliance 1 is divided into a hot water supply combustion chamber 3 and a bath combustion chamber 4 as another function combustion chamber through a partition wall 2, and a hot water supply burner device 5 is provided in the hot water supply combustion chamber 3. A bath burner device 6 is provided in the bath combustion chamber 4.

The hot water supply burner device 5 and the bath burner device 6
Are arranged side by side through a partition wall 2, and a common air chamber (air chamber) 7 is provided below the hot water supply burner device 5 and the bath burner device 6. A combustion fan 8 for supplying and exhausting air is continuously provided on the bottom surface side of the air chamber 7.

In this type of conventional composite combustor, both the hot water supply burner device 5 and the bath burner device 6 are unitized by arranging a plurality of identical Bunsen type burners in an array. The burner device of
As shown in FIG. 7, a plurality of well-known Bunsen type burners 10, such as a Bunsen burner or a semi-Bunsen burner, are arranged in an array, and a gas nozzle 12 is opposed to a gas inlet (bell mouth) 11 of each burner 10.

Fuel gas is ejected from the gas nozzle 12 into the gas inlet 11, and the combustion fan 8 is also introduced into the gas inlet 11.
By taking in the air supplied from, the fuel gas and the primary air are agitated and mixed between the gas introduction port 11 and the flame port 14 of the combustion surface 13, and the high-concentration premixing produced by this agitation and mixing is performed. Gas (mixed gas of air and fuel gas whose air mixing ratio is lower than the theoretical air amount) is ejected from the flame port 14 into the combustion chamber, while the air blown from the combustion fan 8 is between the burners 10. The high-concentration premixed gas ejected as secondary air through the gap into the combustion chamber and ejected from the flame port 14 takes in the secondary air and is completely combusted.

In the hot water supply and combustion chamber 3, there is a hot water supply burner device 5.
A hot water supply heat exchanger 15 is installed on the upper side of the hot water supply heat exchanger 15 that heats the water introduced from a water supply passage (not shown) by the combustion flame of the hot water supply burner device 5 to set the temperature. Hot water is produced, and this hot water is led to a desired hot water supply place such as a kitchen through a hot water supply passage connected to the outlet side of the hot water supply heat exchanger 15 to perform hot water discharge.

A bath heat exchanger 16 is installed in the bath combustion chamber 4 above the bath burner device 6, and the bath heat exchanger 16 introduces circulating hot water from the bathtub to operate the bath burner device 6. The bath is heated by heating it with a combustion flame and returning the heated water to the bathtub.

In the conventional composite combustor, as described above, the hot water supply burner device 5 and the bath burner device 6 are formed by using the same Bunsen type burner 10, so that the pressure of the air chamber 7 is adjusted to the hot water supply burner device 5 side. The hot water supply burner device 5 and the bath burner device 6 are burned so that the same air pressure is applied to the bath burner device 6 side.

[0009]

As is well known, hot water supply combustion is required to have a much higher heat quantity of combustion than bath combustion, and there is a conventional example in which this required heat quantity is achieved by using a Bunsen type burner 10. Bunsen type burner 10
The premixed gas ejected from the flame port 14 fully takes in the surrounding secondary air and completely burns it, so that the flame temperature becomes high and nitrogen oxides (NOx) are inevitably generated. In particular,
Since a large amount of heat of combustion is required on the hot water supply / burning side, the amount of combustion increases correspondingly, and the amount of nitrogen oxides produced also increases, which causes environmental pollution.

In view of such a problem, the inventor of the present invention burns the burner device 5 on the hot water supply side without using the Bunsen type burner 10 by using only the primary air which produces less nitrogen oxides. We have proposed and prototyped a hot water supply burner system using a low NOx rich-burn burner.

As shown in FIG. 5, the proposed hot water supply burner device has a light burner 17 for ejecting a low-concentration premixed gas having a higher air ratio than the theoretical air amount from the flame port 14a, and a lighter burner device than the theoretical air amount. High-concentration premixed gas with a low air ratio is used for flame outlet 14b
Units are formed by arranging the dense burners 18 ejected from the side-by-side side-by-side arrangement, and both the light burner 17 and the rich burner 18 are the air (primary air) from the gas inlet of the burner and the fuel gas ejected from the gas nozzle. Take in the light burner 17
Produces a large amount of low-concentration premixed gas having an air ratio higher than the theoretical air amount when the gas and the primary air pass through the burner, and ejects this from the flame port 14a into the combustion chamber.

On the other hand, the rich burner 18 also produces a small amount of high-concentration premixed gas whose air ratio is lower than the theoretical air amount when the air and the fuel gas pass through the burner, and burns this from the flame port 14b. Gush into the room. Then, the high-concentration premixed gas is burned by receiving the air of the low-concentration premixed gas ejected from the adjacent light burner 17, and the low-concentration premixed gas absorbs the heat of the high temperature flame of the adjacent rich burner 18. Get it and burn it.
In this rich-lean combustion type burner device, the amount of the low-concentration premixed gas ejected from the light burner 17 is much larger than the amount of the high-concentration premixed gas ejected from the rich burner 18, and as a result, the hot water supply burner device The entire combustion surface was occupied almost entirely by the light burner 17 or the low-temperature combustion flame of the low-concentration premixed gas that was ejected, so that it was possible to achieve clean combustion with very little production of nitrogen oxides.

However, since the hot water supply burner apparatus using the rich-lean burn type burner does not have the secondary air passing between the burners, it is a system in which all the primary air passing through the burner burns.
The pressure loss (passage resistance) in the burner from being taken into the gas inlet of the burner and being ejected from the flame mouth is much larger than in the bath burner device using the Bunsen type, and as in the conventional example, the air chamber If a method of uniformly controlling and burning the inside of 7 is adopted, for example, when the pressure in the air chamber 7 is set to match the combustion of the bath burner device, the pressure on the hot water supply burner device side is too low and The amount becomes insufficient, and good combustion performance cannot be obtained. On the contrary, if the pressure in the air chamber 7 is made uniform according to the hot water supply burner device side, this time, the bath burner device side will generate excess air. I faced the problem of burning, which deteriorates the combustion performance on the bath side.

The present invention has been made to solve the above problems, and an object thereof is to construct a burner device on the bath side using a Bunsen type burner, and to configure the burner device on the hot water supply side with all primary air density. An object of the present invention is to provide a composite combustor that can satisfactorily burn both the hot water supply side and the hot water supply side even when using a burner device having different pressure losses on the hot water supply side and the hot water supply side.

[0015]

In order to achieve the above object, the present invention is constructed as follows. That is, according to the present invention, a hot water supply burner device and a burner device having another function other than hot water are arranged side by side, and the lower sides of the hot water supply burner device and the other function burner device are air chambers that communicate with each other, and the air chamber is In a composite combustor that communicates with a combustion fan for air supply and exhaust and a hot water supply burner device side, the hot water supply burner device is formed by a rich-lean combustion type burner using all primary air, and the other function burner device uses secondary air. The burner is formed by a burning Bunsen type burner, and an air flow obstacle flowing from the hot water supply burner device side to the other function burner device side is provided in the boundary region between the hot water supply burner device side and the other function burner device side of the air chamber to supply hot water. A pressure adjusting means is provided to increase the air pressure in the chamber on the side of the burner device to be higher than the air pressure in the chamber on the side of other function burner device. It is configured as characterized.

Further, the pressure adjusting means having the above-mentioned configuration is provided by a damper for adjusting the air flow passage in the boundary region between the hot water supply burner device side of the air chamber and the other function burner device side, or the hot water supply burner device side of the air chamber. And punching metal that has a plurality of through-holes to partition the air flow passage in the boundary area between the other function burner apparatus side, or the air flow path in the boundary area between the hot water supply burner apparatus side of the air chamber and the other function burner apparatus side. It is also a characteristic feature of the present invention that each of them is constituted by an orifice for narrowing.

[0017]

In the present invention having the above-mentioned structure, when the blast air is supplied from the combustion fan into the air chamber and both the hot water supply burner device and the other function burner device burn together, it is sent from the combustion fan to the hot water supply burner device side. When the blown air flows from the hot water supply burner device side to the other function burner device side, when it passes through the air flow obstacle of the pressure adjusting means provided in the boundary region between the hot water supply burner device side and the other function burner device side, the air flow The resistance increases, and the pressure on the hot water supply burner device side of the air chamber becomes higher than the chamber air pressure on the multi-function burner device side.

Since the hot water supply burner device is formed by a rich / lean combustion type burner using all primary air, the pressure loss of the air circulation is larger than that of the other-function burner device formed by the Bunsen type burner, and this pressure loss is large. The hot water supply burner device side is adjusted to a higher pressure than the other function burner device side by the pressure adjusting means. As a result, the blower air pressure from the combustion fan is adjusted to the optimum pressure on the hot water supply burner device side and the other function burner device side, respectively, and both the hot water supply burner device and the other function burner device are operated under the optimum air pressure. Burns well.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. In the description of each embodiment described below,
The same name portions as those in the conventional example are designated by the same reference numerals, and the duplicate description thereof will be omitted. FIG. 1 shows a first embodiment of a composite combustor according to the present invention.

In the composite combustor of this embodiment, as in the conventional example, a hot water supply combustion chamber 3 and a bath combustion chamber 4 are partitioned and formed through a partition wall 2 in the appliance 1, and the hot water supply burner device 5 side is formed. A combustion fan 8 is provided near the hot water supply burner device 5 side on the bottom side of the air chamber 7 that communicates with the bath burner device 6 side.

In the present embodiment, the bath burner device 6 is formed by using a Bunsen type burner as in the conventional example. A feature of this embodiment is that the hot water supply burner device is composed of a low NOx type rich / lean burn type burner with all primary air in which a light burner 17 and a rich burner 18 are arranged next to each other as shown in FIG. The orifice 20 is provided in the boundary area between the hot water supply burner device 5 side and the bath burner device 6 side in the air chamber 7 as a pressure adjusting means for narrowing the air flow passage.

FIG. 2 shows a more detailed detailed view of the forming portion of the pressure adjusting means. The bath burner device 6 is housed in the bath burner case 21, and the hot water supply burner device 6 is placed in the hot water supply burner case 22. The air chamber 7 is housed in both the lower part of the bath burner case 21 and the lower part of the hot water supply burner case 22.
The air chamber 7 on the bath burner case 21 side and the air chamber 7 on the hot water supply burner case 22 side communicate with each other via an orifice 20.

In FIG. 2, reference numeral 23 is a gas inlet of the light burner 17 in the hot water supply burner apparatus, and 24 is a gas inlet of the rich burner 18 of the hot water supply burner apparatus 5 as well. Is opposed to a gas nozzle (not shown) for ejecting a large amount of fuel gas to the light burner 17, and a gas nozzle for ejecting a small amount of fuel gas to the rich burner 18 is provided at the gas inlet 24 of the rich burner 18 (see FIG. (Not shown) will be arranged facing each other.

In this embodiment, the combustion fan 8 is driven to rotate and the combustion air is supplied to the air chamber 7 of the hot water supply burner device 5, so that the supplied air is supplied to the orifice 20.
And is supplied to the air chamber 7 on the side of the bath burner device 6. At this time, when the air supplied to the hot water supply burner device 5 side passes through the opening 25 of the orifice 20, a large air resistance is generated to cause a pressure loss, and the pressure in the chamber on the hot water supply burner device 5 side is the bath burner device 6 side. Will be higher than the chamber pressure. The pressure difference between the hot water supply burner device side and the bath burner device 6 side increases as the area of the opening 25 of the orifice 20 decreases.

In the present embodiment, the chamber internal air pressure (or pressure loss due to circulating air resistance) on the hot water supply burner device 5 side during optimum combustion and the chamber internal air pressure (or pressure on the bath burner device 6 side during optimum combustion (or The pressure loss of the circulating air resistance) is obtained in advance, and the area of the opening 25 of the orifice 20 is set so as to obtain a differential pressure that cancels the pressure difference between the burner devices 5 and 6.

As a result, in the present embodiment, the amount of air blown by the combustion fan 8 is controlled to be optimal for either one of the hot water supply burner device 5 and the bath burner device 6, so that the burner device on the other side is controlled. The air supply pressure also becomes an optimum value, and it becomes possible to supply combustion air to the hot water supply burner device 5 side and the bath burner device 6 side with the optimum air pressure using the common combustion fan 8, thus providing a hot water supply burner device. Both the 5 side and the bath burner device 6 side can be burned under good combustion performance. Moreover, since the hot-water supply burner device 5 side, which requires a high amount of heat, is formed by using the rich / lean combustion type burner using all primary air, it is possible to achieve clean hot-water supply combustion with extremely small generation of nitrogen oxides.

FIG. 3 shows the construction of the essential parts of the second embodiment of the present invention. This embodiment is different from the first embodiment in that the punching metal 26 is used as the pressure adjusting means for the air pressure in the chamber between the hot water supply burner device 5 side and the bath burner device 6 side. The other configuration is the same as that of the first embodiment. In this embodiment, the bath burner case 21 side and the hot water supply burner case 22 side are connected by the communication passage 27, and the opening of the communication passage 27 is closed by the punching metal 26.

The punching metal 26 is a metal plate provided with a plurality of through holes 28 by pressing or the like.
Blower air supplied from the hot water supply burner device 5 side through holes
When entering the bath burner apparatus 6 side through 28, a pressure loss occurs as in the case of the orifice 20 of the first embodiment, and due to this pressure loss, the chamber air pressure on the hot water supply burner apparatus 5 side changes to the bath. It becomes higher than the air pressure in the chamber on the burner device 6 side, and like the first embodiment, a larger pressure loss portion of the air circulation on the hot water supply burner device 5 side (a larger pressure loss portion than the bath burner device 6 side). By compensating for the above, the hot air supply burner device 5 side and the bath burner device 6 side can both be set to the optimum chamber air pressure for performing combustion, and both burner devices 5, 5 as in the first embodiment. Good combustion of 6 is achieved.

FIG. 4 shows the essential structure of the third embodiment of the present invention. This embodiment is different from the first and second embodiments in that the damper 30 is used as the pressure adjusting means for adjusting the chamber air pressure between the hot water supply burner device 5 side and the bath burner device 6 side. It was configured as
The other structure is the same as that of each of the above embodiments. In this embodiment, the bath burner case 21 and the hot water supply burner case 22 are communicated with each other through the communication passage 27 as in the case of the second embodiment, and the damper 30 is provided in this communication passage 27. In this embodiment, by adjusting the rotational position of the damper 30, the air resistance of the air passing through the communication passage 27, that is, the pressure loss can be adjusted.

Therefore, similar to each of the above-described embodiments, a pressure difference that cancels out the pressure difference between the hot water supply burner device 5 and the bath burner device 6 (difference in pressure loss of air flowing through the burner device) during optimum combustion is generated. By setting the rotational position of the damper 30 to the optimum position, the chamber air pressures on the hot water supply combustion chamber 3 side and the bath combustion chamber 4 side can be optimally adjusted as in the first and second embodiments. Thus, it becomes possible to satisfactorily burn both the hot water supply burner device 5 and the bath burner device 6.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in the above-mentioned embodiment, the combined burner for hot water supply and the bath has been described as an example, but the present invention is also applied to a combined burner having a heating function by hot water supply and gas combustion. Also,
The hot water supply burner device is composed of a rich-lean burn type burner with all primary air, and the gas heating burner device is composed of a Bunsen type burner.

Further, in each of the above embodiments, the obstruction of the air flow of the pressure adjusting means is caused by the orifice 20 and the punching metal 26.
Alternatively, the damper 30 is used, but it may be formed by using various other structural configurations of the air flow obstruction.

[0033]

According to the present invention, unlike the Bunsen type burner, which is a multi-function burner device, the hot water supply burner device is formed by a rich-burn combustion burner using all primary air. It is possible to effectively suppress the generation of nitrogen oxides on the hot water supply combustion side where the generation of oxides becomes a problem, and thus it is possible to achieve clean hot water combustion with less nitrogen oxides.

Further, as described above, the other function burner device is formed by a Bunsen type burner, and the hot water supply burner device is formed by a rich-lean combustion type burner using all primary air, so that the hot water supply burner device and other functions are inevitably formed. When the air resistance pressure loss of the burner device is different and the hot water supply burner device and the burner device with other functions are burned by the air blown by the common combustion fan, the pressure loss of both burner devices is different. It was difficult to burn both of them together with good performance. Since a pressure adjusting means is provided to make the air pressure higher than the air pressure in the chamber on the side of the burner with other functions, it is possible to use a Bunsen type burner. And other functions burner device made, so that the difference in pressure loss inevitably occurring air circulation between the water heater burner device formed by the total primary air by thick and thin fuel combustion burner is effectively compensated.

This makes it possible to adjust and set the air pressure in the chamber on the hot water supply burner apparatus side and the air pressure in the chamber on the other function burner apparatus side to optimum air pressures for combustion. It is possible to achieve the epoch-making effect that both the hot water supply burner device and the other-function burner device can be satisfactorily burned under high combustion performance by using the common combustion fan.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a first embodiment of a composite combustor according to the present invention.

FIG. 2 is a specific detailed explanatory diagram of a main part in the embodiment.

FIG. 3 is an explanatory diagram of a main part configuration of a second embodiment.

FIG. 4 is an explanatory diagram of a main part configuration of a third embodiment.

FIG. 5 is a plan view of a hot water supply burner device formed by a rich / lean combustion type burner using all primary air.

FIG. 6 is an explanatory view of a conventional general hot water / bath combined burner.

FIG. 7 is an explanatory diagram of a burner device formed by a Bunsen type burner.

[Explanation of symbols]

5 Hot water supply burner device 6 Bath burner device 7 air chamber 8 combustion fan 14,14a, 14b Flame mouth 20 orifice 26 punching metal 30 damper

Claims (4)

(57) [Claims] 1. A hot water supply burner device and a burner device having a function other than hot water supply are arranged in parallel, and lower sides of the hot water supply burner device and the other function burner device are air chambers that communicate with each other, and the air chambers are connected to each other. In a composite combustor that communicates with an exhaust combustion fan on the hot water supply burner device side, the hot water supply burner device is formed by a rich / lean combustion type burner using all primary air, and the other function burner device burns using secondary air. The burner is formed by a Bunsen type burner, and the hot water supply burner is provided with an obstacle in the air flow flowing from the hot water supply burner device side to the other function burner device side in the boundary region between the hot water supply burner device side and the other function burner device side of the air chamber. It is characterized in that a pressure adjusting means is provided for increasing the air pressure in the chamber on the apparatus side to be higher than the air pressure in the chamber on the other function burner apparatus side. And a combined combustor. 2. The composite combustor according to claim 1, wherein the pressure adjusting means is constituted by a damper for adjusting the air flow passage in the boundary region between the hot water supply burner device side of the air chamber and the other function burner device side. 3. The pressure adjusting means is composed of punching metal provided with a plurality of through holes for partitioning an air flow passage in a boundary region between the hot water supply burner device side of the air chamber and the other function burner device side. Composite combustor. 4. The composite combustor according to claim 1, wherein the pressure adjusting means is constituted by an orifice for narrowing an air flow passage in a boundary region between the hot water supply burner device side and the other function burner device side of the air chamber.