JP3686488B2 - Original mixed surface combustion burner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an original mixed surface combustion burner, and more specifically, to an absorption chiller / heater combustion device, an absorption chiller, a steam boiler, a hot water boiler, a heating cooker, a heater, and other various devices. The present invention relates to a large original mixed surface combustion burner having a large combustion capacity.
[0002]
[Prior art]
Conventionally, a large number of mixed gas ejection holes have been provided on the burner surface, and a mixed gas in which fuel gas and combustion air are mixed is ejected from the ejection holes to form a large number of micro flames on the ejection side for combustion. The original mixed surface combustion burner with a single surface combustion plate is generally used because it has a structure that can permeate mixed gas well and resist backfire, but it mixes fuel gas and combustion air. Therefore, in the case of a large burner having a large combustion capacity, the surface combustion plate has a large area and it is difficult to obtain a uniform mixed gas.
In order to obtain a uniform mixed gas, the mixer needs to have a large and complicated structure. Also, there are methods such as enlarging the blower and increasing the gas pressure of the fuel gas, but increasing the blower increases the static pressure, and increasing the fuel gas pressure uses the fuel gas supplied at a low pressure. There is a drawback that can not be done.
[0003]
There is a proposal for dividing a large number of flames generated on the burner surface for each desired surface area and measuring the flame holding of the combustion flame (Japanese Patent Laid-Open No. 3-213904), but in the case of a large original mixed surface combustion burner with increased combustion capacity It was difficult to solve the above problems.
[0004]
[Problems to be solved by the invention]
The object of the present invention is to solve the above-mentioned problems and to obtain a uniform mixed gas even in the case of a large burner having a large combustion capacity, and to obtain a uniform flame by making the flow of the combustion gas uniform. An object of the present invention is to provide an original mixed surface combustion burner that can achieve low NOx, low noise, and a compact combustion apparatus.
[0005]
[Means for Solving the Problems]
As a result of diligent research in view of the above problems, the present inventor has provided a plurality of mixers for mixing the fuel gas and the combustion air on the supply side of the mixed gas with respect to the surface combustion plate, or further, each mixer. The present inventors have found that the above-mentioned problems can be solved by changing the fuel gas concentration in the mixed gas and performing the light and dark combustion on the surface combustion plate.
[0008]
That is, the invention of claim 1 of the present invention is provided with a large number of mixed gas ejection holes on the burner surface, and a large number of micro flames are formed on the ejection side by ejecting a mixed gas of fuel gas and combustion air from the ejection holes. In the former mixed surface combustion burner having a single vertical surface combustion plate that is made to burn, a plurality of partition walls for mixing the fuel gas and the combustion air on the supply side of the mixed gas to the surface combustion plate A plurality of mixers are provided, and the fuel gas concentration in the mixed gas is increased in the lower part in the gravity direction of the surface combustion plate and decreased in the upper part in the direction of gravity of the surface combustion plate, and light and dark combustion is performed on the surface combustion plate. An original mixed surface combustion burner characterized in that
[0010]
The invention of claim 2 of the present invention comprises a large number of mixed gas jet holes on the burner surface, and a mixed gas of fuel gas and combustion air is jetted from the jet holes to form a large number of micro flames on the jet side. In an original mixed surface combustion burner having a single vertical surface combustion plate to be combusted, a plurality of partition walls are used to mix fuel gas and combustion air on the supply side of the mixed gas to the surface combustion plate. A plurality of partitioned mixers are provided, and the fuel gas concentration in the mixed gas in each mixer is alternately changed in the order of dark and light in the surface combustion plate gravity direction, and the light and dark on the surface combustion plate is changed. An original mixed surface combustion burner characterized by performing combustion.
[0011]
The invention according to claim 3 of the present invention is characterized in that, in the original mixed surface combustion burner according to claim 1 or 2 , the fuel gas concentration in the mixed gas is changed by providing an orifice in the fuel gas pipe. To do.
[0012]
According to a fourth aspect of the present invention, in the former mixed surface combustion burner according to any one of the first to third aspects, the fuel gas concentration in the mixed gas is reduced by providing an orifice in the combustion air pipe. It is characterized by changing.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional explanatory view showing an example of an original mixed surface combustion burner of the present invention provided with a plurality of mixers for mixing fuel gas and combustion air.
[0014]
In FIG. 1, an original mixed surface combustion burner 1A of the present invention has a large number of mixed gas ejection holes (not shown) on the burner surface, and a large number of mixed gases of fuel gas and combustion air are ejected from the ejection holes to the ejection side. And a plurality of partition walls for mixing the fuel gas and the combustion air on the supply side of the mixed gas to the surface combustion plate 1. Three mixers 3A, 3B, 3C partitioned by 2A, 2B are provided.
A mixed gas passage 4 is provided between the surface combustion plate 1 and the partition wall 2A, and between the surface combustion plate 1 and the partition wall 2B, and the mixed gas in the adjacent mixer passes through the passage 4 to cause surface combustion. The structure communicates in the vicinity of the plate 1.
5, 6, 7, and 8 are fuel gas pipes, and 9, 10, 11, and 12 are combustion air pipes.
[0015]
In the original mixed surface combustion burner 1A having the above-described configuration, a required amount of fuel gas is introduced into the mixer 3A from the pipe 5 through the pipe 6, and a required amount of combustion air is introduced from the pipe 9 through the pipe 10. In the mixer 3A, both are well mixed and ejected from a large number of mixed gas ejection holes (not shown) of the surface combustion plate 1 to form a large number of micro flames F on the ejection side and combustion is performed. A part of the mixed gas can enter the adjacent mixer 3 </ b> B through the passage 4.
[0016]
The required amount of fuel gas is introduced into the mixer 3B through the pipe 5 through the pipe 7, and the required amount of combustion air is introduced through the pipe 9 through the pipe 11, both of which are well mixed in the surface combustion. Combustion is performed by ejecting from a large number of mixed gas ejection holes (not shown) of the plate 1 and forming a large number of micro flames F on the ejection side. A part of the mixed gas can enter the adjacent mixer 3A and the mixer 3C via the passages 4 and 4.
[0017]
The required amount of fuel gas is introduced into the mixer 3C through the pipe 5 through the pipe 8, and the required amount of combustion air is introduced through the pipe 9 through the pipe 12, and both are well mixed in the mixer 3C and surface combustion. Combustion is performed by ejecting from a large number of mixed gas ejection holes (not shown) of the plate 1 and forming a large number of micro flames F on the ejection side. A part of the mixed gas can enter the adjacent mixer 3 </ b> B through the passage 4.
[0018]
Mixers 3A, 3B, and 3C are provided and the required amount of fuel gas and the required amount of combustion air are mixed well in each mixer, so that a uniform mixed gas can be obtained and stable combustion is performed. Therefore, NOx reduction, noise reduction, and downsizing of the combustion apparatus can be achieved.
[0019]
On the other hand, when the mixer is divided into a plurality of parts as described above, when the partition walls 2A and 2B of the mixers 3A, 3B and 3C are connected to the surface combustion plate 1, the portion of the surface combustion plate 1 where the connecting portion is present. In some cases, the supply of the mixed gas is hindered, and a uniform flame on the surface combustion plate 1 surface cannot be obtained. When a uniform flame cannot be obtained on the surface combustion plate 1 surface, sound is generated, the plate 1 is damaged due to local overheating, or backfire is caused.
Since the mixed gas passages 4 are provided between the surface combustion plate 1 and the partition wall 2A and between the surface combustion plate 1 and the partition wall 2B as described above, the mixed gas mixed by each mixer is used as the surface combustion plate. 1, the gas mixture is supplied uniformly to the surface combustion plate 1, and a uniform flame F on the surface combustion plate 1 surface is obtained.
[0020]
FIG. 2 is a cross-sectional explanatory view showing an example of another original mixed surface combustion burner of the present invention provided with a plurality of mixers for mixing fuel gas and combustion air.
[0021]
In FIG. 2, an original mixed surface combustion burner 1B of the present invention has a large number of mixed gas ejection holes (not shown) on the burner surface, and a large number of mixed gases of fuel gas and combustion air are ejected from the ejection holes to the ejection side. And a plurality of partition walls for mixing the fuel gas and the combustion air on the supply side of the mixed gas to the surface combustion plate 1. Three mixers 3A, 3B, 3C partitioned by 2A, 2B are provided.
5, 6, 7, and 8 are fuel gas pipes, and 9, 10, 11, and 12 are combustion air pipes. Reference numerals 13, 14, 15 denote orifices installed in the fuel gas pipes 6, 7, 8.
[0022]
In the original mixed surface combustion burner 1B having the above-described configuration, the fuel gas is introduced into the mixer 3A from the pipe 5 through the pipe 6 provided with the orifice 13, and the required amount of combustion air is supplied from the pipe 9. Introduced via the pipe 10, both are well mixed in the mixer 3 </ b> A (the fuel gas concentration in the mixed gas is set to a%, for example) and ejected from a large number of mixed gas ejection holes (not shown) of the surface combustion plate 1. Many micro flames F are formed on the side and combustion is performed.
[0023]
A necessary amount of fuel gas is introduced into the mixer 3B from the pipe 5 through the pipe 7 provided with the orifice 14, and a necessary amount of combustion air is introduced from the pipe 9 through the pipe 11 into the mixer 3B. Are mixed well (the fuel gas concentration in the mixed gas is set to b%, for example), and are ejected from a large number of mixed gas ejection holes (not shown) of the surface combustion plate 1 to form a large number of micro flames F on the ejection side and combustion occurs. Done.
[0024]
A necessary amount of fuel gas is introduced into the mixer 3C from the pipe 5 through the pipe 8 provided with the orifice 15, and a required amount of combustion air is introduced from the pipe 9 through the pipe 12 into the mixer 3C. Are mixed well (the fuel gas concentration in the mixed gas is set to, for example, a%), and are ejected from a large number of mixed gas ejection holes (not shown) of the surface combustion plate 1 to form a large number of micro flames F on the ejection side and combustion occurs. Done.
[0025]
Since the fuel gas concentrations a and b in the mixed gas in the mixers 3A, 3B and 3C are not the same, but are changed, the light and dark combustion is performed on the surface combustion plate 1. For example, when the original mixed surface combustion burner is used to burn a fuel gas with a high combustion rate, or when the flow velocity of the mixed gas passing through the surface combustion plate is increased by increasing the surface combustion load, Resonance noise may be generated due to interference, but by changing the fuel gas concentration in the mixed gas in the mixers 3A, 3B, and 3C as described above and performing the light and dark combustion on the surface combustion plate 1, Mutual interference can be reduced to prevent the generation of resonance.
[0026]
The flame burns upward, and the upper flame concentration tends to be higher, and the interference of the upper flame becomes larger. Therefore, the fuel gas concentration in the mixed gas is increased at the lower part of the surface combustion plate 1 in the direction of gravity (for example, the mixer 3C is provided at the lower part of the surface combustion plate 1 in the direction of gravity and the mixer 3A is provided at the upper part of the surface combustion plate 1 in the direction of gravity. In some cases, the fuel gas concentration in the mixer 3C is increased), and the upper portion in the gravitational direction of the surface combustion plate 1 is decreased (the fuel gas concentration in the mixer 3A is decreased), thereby reducing the interference of the upper flame. be able to.
[0027]
As described above, the fuel gas concentrations a and b in the mixed gas in the mixers 3A, 3B, and 3C are not the same. For example, a is controlled so that a is larger than b, so that the concentration combustion is performed on the surface combustion plate 1. It is designed to be performed alternately. By arranging so that the light and shade combustion is performed alternately, the interference of the flame can be reduced, and the resonance sound due to the interference of the flame can be prevented. This means is particularly effective when a gas having a high combustion rate is used.
[0028]
The former mixed surface combustion burner 1B of the present invention shown in FIG. 2 is provided with an orifice 13, 14, 15 in the fuel gas pipes 6, 7, 8 to change the fuel gas concentration in the mixed gas, thereby mixing the mixer. Therefore, the concentration combustion can be easily performed on the surface combustion plate 1 and the combustion load can be easily changed on the surface combustion plate 1 corresponding to each mixer. Therefore, mutual interference of flames due to the division of the flames can be prevented.
[0029]
As a method of changing the fuel gas concentration in the mixed gas, an orifice may be provided in the combustion air piping system to each mixer. Moreover, in this invention, it can also combine with the means which provides an orifice in the fuel gas piping system to each mixer.
Since the surface combustion burner cannot take a large turndown (combustion amount control range), when the combustion load of the surface combustion plate 1 corresponding to each mixer is changed, the turndown becomes relatively small. However, according to the means for providing an orifice in the air piping system to each mixer, concentration combustion can be performed without changing the surface combustion load of the surface combustion plate 1 corresponding to each mixer, so turn-down is not sacrificed. I'm sorry.
[0030]
【The invention's effect】
The original mixed surface combustion burner of the present invention can obtain a uniform mixed gas even in the case of a large burner having a large combustion capacity, and can obtain a uniform flame by making the flow of the combustion gas uniform, so that low NOx can be obtained. Reduction, noise reduction, and downsizing of the combustion apparatus can be achieved.
The original mixed surface combustion burner of the present invention has a simple structure and is economical, and can be used for an absorption chiller / heater combustion device, an absorption chiller, a steam boiler, a hot water boiler, a heating cooker, a heater, and other various devices. Since it can be applied, it has high industrial utility value.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing an example of an original mixed surface combustion burner of the present invention provided with a plurality of mixers for mixing fuel gas and combustion air.
FIG. 2 is a cross-sectional explanatory view showing an example of another former mixed surface combustion burner of the present invention provided with a plurality of mixers for mixing fuel gas and combustion air.
[Explanation of symbols]
1A, 1B Original mixed type surface combustion burner 1 Surface combustion plate 2A, 2B Bulkhead 3A, 3B, 3C Mixer 4 Passage 5, 6, 7, 8, 9, 10, 11, 12 Pipe 13, 14, 15 Orifice

Claims (4)

A single vertical type equipped with a large number of mixed gas ejection holes on the burner surface, and a mixture of fuel gas and combustion air is ejected from the ejection holes to form a large number of micro flames on the ejection side. in the original mixed surface combustion burner having a surface combustion plate, Ru provided with a plurality of mixers which are defined by a plurality of partition walls in order to mix the combustion air and fuel gas on the supply side of the mixed gas to the surface combustion plate In addition, the fuel gas concentration in the mixed gas is increased in the lower portion in the gravity direction of the surface combustion plate and decreased in the upper portion in the gravity direction of the surface combustion plate, and the original mixing type is characterized by performing concentration combustion on the surface combustion plate Surface burning burner. A single vertical type equipped with a large number of mixed gas ejection holes on the burner surface, and a mixture of fuel gas and combustion air is ejected from the ejection holes to form a large number of micro flames on the ejection side. In the former mixed surface combustion burner provided with the surface combustion plate, a plurality of mixers partitioned by a plurality of partition walls are provided on the supply side of the mixed gas to the surface combustion plate to mix the fuel gas and the combustion air. The fuel gas concentration in the mixed gas in each mixer is alternately changed in the order of dark and light in the gravity direction of the surface combustion plate to perform light and dark combustion on the surface combustion plate. Mold surface combustion burner. The former mixed surface combustion burner according to claim 1 or 2, wherein the concentration of the fuel gas in the mixed gas is changed by providing an orifice in the fuel gas pipe. 4. The former mixed surface combustion burner according to claim 1 , wherein the fuel gas concentration in the mixed gas is changed by providing an orifice in the combustion air pipe.

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