WO2012053724A1

WO2012053724A1 - Premixing burner with self-provided baffle plate

Info

Publication number: WO2012053724A1
Application number: PCT/KR2011/004506
Authority: WO
Inventors: 민태식
Original assignee: 주식회사 경동나비엔
Priority date: 2010-10-22
Filing date: 2011-06-21
Publication date: 2012-04-26
Also published as: KR20120088886A

Abstract

The present invention aims to provide a premixing burner with a self-provided baffle plate for simplifying the structure of the burner and enhancing the safety and combustion efficiency of flames by including the baffle plate in the structure without requiring additional equipment. To this end, the present invention comprises: a burner body portion which is formed by overlapping a plurality of plates having a cut-open portion; mixed gas inflow ports, which are provided on the surface of one side of the plurality of plates that are arranged so that the cut-open portions of the adjacent plates overlap with each other; a mixed gas flow channel which is provided inside the plates and communicates with the mixed gas inflow ports; and a plurality of burner holes which communicate with the mixed gas flow channel and are formed on the surface the other side of the plates, wherein the mixed gas inflow ports are formed on the one side of the plurality of plates with uniform size and distance therebetween so as to function as the self-provided baffle plate, thereby allowing an equal amount of mixed gas to be supplied to the plurality of burner holes that are connected to the mixed gas inflow ports.

Description

Premixed burners with self-regulating plates

The present invention relates to a premixed burner having a rectifying plate by itself, and more particularly, a mixed gas of fuel and air supplied to a plurality of salt holes formed on the upper surface of the burner is distributed in a uniform amount to each salt hole. The present invention relates to a premixed burner having a rectifying plate which is configured to include a rectifying plate to be included in its own structure without additional equipment, thereby simplifying the burner structure and improving flame stability and combustion efficiency.

In general, a gas burner used in a combustion device such as a boiler or a water heater may be classified into a Bunsen burner and a pre-mixed burner according to a method of mixing combustion gas and air.

The Bunsen burner is a burner that supplies the minimum primary air necessary for combustion from the nozzle injecting the gas and supplies the excess secondary air to the part where the flame is formed to realize complete combustion. On the other hand, since the flame is formed by the secondary air has a disadvantage that the flame length is long.

In contrast, the premix burner burns the premixed gas pre-mixed with the combustion gas and air in the mixing chamber, enabling operation at a low air ratio, enabling high efficiency and high load combustion, and reducing the overall flame length. At the same time, the temperature of the flame has the advantage of reducing the generation of pollutants such as carbon monoxide and nitrogen oxides.

Conventionally, Bunsen burners are mainly used, but in recent years, premixed burners are mainly used to reduce the amount of pollutants generated and to downsize the combustion chamber.

1 is a cross-sectional view of a premix burner provided with a conventional rectifying plate.

In the conventional premix burner 300, the air supplied from the blower 310 and the gas supplied from the fuel supply pipe through the fuel nozzle 320 are premixed inside the mixing pipe 330, and the burner flame hole provided on the upper side thereof ( 350).

In addition, the mixing pipe 330 is rectified to allow the mixed gas of air and gas supplied to the salt hole 350 to be distributed in a uniform amount to the plurality of salt holes provided in the burner flame hole 350. Plate 340 is installed.

For example, the rectifying plate 340 is formed by forming a plurality of holes having a predetermined size in a quadrangular panel at regular intervals, and the rectifying plate 340 is a mixed gas introduced into the salt hole 350. Induced to be supplied in a uniform distribution throughout the study 350 at the same time the mixed gas passing through the rectifying plate 340 becomes turbulent serves to improve the air and gas mixing characteristics and flame stability.

However, in the conventional premix burner 300, the rectifying plate 340 and the salt hole 350 is composed of separate parts, and the mixing plate 340 is installed inside the mixing tube 330, and then mixed. Since the salt hole 350 must be installed on the top of the pipe 330, the installation structure is complicated, and there is a problem in that the total volume of the burner is increased to secure an installation space.

In addition, the salt hole of the premixed burner is a structure in which salt holes are punctured in a single plate or a cylindrical plate. However, such a structure is used in which the burner combustion surface is deformed due to thermal stress or the salt hole is damaged in severe cases, resulting in incomplete combustion. There was a problem that backfire was caused, and due to the heat of the burner surface during the low load combustion accumulated thermal expansion to apply a large force to the structure for fixing the burner has a problem in that the structure is weakened and durability is reduced.

The present invention has been made in order to solve the above problems, by configuring the rectifying plate to be included in its own structure without any additional equipment to simplify the structure of the burner while improving the stability of the flame and combustion efficiency It is an object of the present invention to provide a self-mixing burner.

In addition, the present invention can extend the service life of the burner by preventing a large force is applied to the structure for fixing the burner even if the thermal expansion due to the red heat on the burner surface, and prevents deformation of flame holes due to thermal stress flame It is an object of the present invention to provide a premixed burner having a double flame hole that can improve the stability and combustion efficiency.

In the pre-mixed burner having the rectifying plate of the present invention for realizing the above object, a plurality of plates partially cut are overlapped to form a burner body part, and the plurality of plates are cut between neighboring plates. The mixed portions are arranged to cross each other so that a mixed gas inlet is formed at one side, and a mixed gas flow passage communicating with the mixed gas inlet is formed therein, and a plurality of salt holes communicating with the mixed gas flow passage are formed at the other side. The mixed gas inlet is formed at a predetermined interval and size on one side of the plurality of plates to serve as a rectifying plate itself, such that a uniform amount of mixed gas is introduced into the plurality of salt holes connected to the mixed gas inlet. It is characterized by.

In this case, the burner body unit may include an inner plate in which plates of a set unit repeatedly formed in a shape in which a part of a side surface is opened between neighboring plates; And an outer plate coupled to the front and rear surfaces of the inner plate to seal the front and rear surfaces of the mixed gas flow path.

In addition, the inner plate, the body portion disposed on both sides, a plurality of salt hole forming portion is arranged at a predetermined interval between the body portion and the salt holes of the different size formed on the upper side, and the transverse direction between the body portion on both sides Is installed as may be composed of a fixing portion for coupling the body portion and the plurality of salt hole forming portion.

In addition, the bonding surface between the salt hole forming portion of the adjacent inner plate may be arranged to be alternated with each other to form an inner space through which the mixed gas passes.

In addition, the salt hole may be formed by a space between the body portion and the upper end portion of the salt hole forming portion adjacent thereto and the space between the upper end portion of the salt hole forming portion.

In addition, the position where the fixing portion is coupled to the salt hole forming portion is spaced up and down between the adjacent inner plate, the mixed gas introduced into the mixed gas inlet formed in the lower portion of any one inner plate is the flow path is switched by the fixing portion adjacent After passing through the inner space of the inner plate may be configured to be ejected through the salt hole formed on the upper side.

In addition, the salt holes, the first salt holes provided on the side in which the mixed gas flows, and the second salt holes having a larger cross-sectional area than the first salt holes is formed in a double structure in series connected, the mixed gas is the first salt holes It may be configured to be ejected through the second salt hole through.

According to the pre-mix burner having a rectifying plate according to the present invention, the mixed gas inlet of the burner body portion formed by overlapping a plurality of plates is formed at a predetermined interval and size so that it is included in its own structure even if the rectifying plate is not separately installed. By simplifying the structure of the burner, it is possible to improve the stability and combustion efficiency of the flame.

In addition, according to the present invention, by forming a burner flame by overlapping a plurality of cut-in part of the plate, the thermal expansion of the burner surface can be absorbed by itself, thereby preventing a large force from being applied to the structure supporting the burner. It is possible to extend the endurance life of the, it is possible to reduce the degree of deformation of the salt hole by the thermal stress has the effect of improving the combustion efficiency by increasing the stability of the flame and prevent incomplete combustion.

1 is a cross-sectional view of a premix burner equipped with a conventional rectifying plate,

2 is a perspective view of a pre-mix burner having its own rectifying plate according to the present invention;

3 is a partially exploded perspective view of FIG. 2;

4 is a front view of the first inner plate shown in FIG. 3, FIG.

5 is a front view of the second inner plate shown in FIG. 3, FIG.

6 is a sectional view taken along the line A-A of FIG.

7 is a sectional view taken along the line B-B of FIG.

8 is a cross-sectional view taken along the line C-C of FIG.

9 is a cross-sectional view taken along the line D-D of FIG. 2.

** Explanation of Codes **

1: premixed burner 10: burner body part

21,22: Floor support frame 23,24: Side support frame

100 inner plate 110 first inner plate

120: second inner plate 130: third inner plate

140: fourth inner plate 150: fifth inner plate

160: sixth inner plate 170: seventh inner plate

111a, 111b, 121a, 121b, 131a, 131b, 141a, 141b: body portion

112,122,132,142,152,162,172: salt hole forming part

113,123,133,143,153,163,173: Fixed part

114a, 114b, 114c:

fastening hole

115a, 115b, 115c: fastening member

110a, 130a, 150a, 170a: Mixed gas inlet

120b, 140b, 160b: interior space

110c, 120c, 130c, 140c, 150c, 160c, 170c: first flame

110d, 120d, 130d, 140d, 150d, 160d, 170d: second flame

210,220: outer plate

300: premix burner 310: blower

320: fuel nozzle 330: mixing tube

340: rectification plate 350: salt study

Hereinafter, the configuration and operation of the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of a premix burner having a rectifying plate according to the present invention, FIG. 3 is a partially exploded perspective view of FIG. 2, FIG. 4 is a front view of the first inner plate shown in FIG. Front view of the second inner plate shown in FIG. 3, FIG. 6 is a cross-sectional view taken along the line AA of FIG. 2.

Premixed burner (1) having a double flame hole according to an embodiment of the present invention, the burner body portion 10, the bottom frame (21, 22) for holding and supporting it, and the front and rear side support frame (23) , 24).

The burner body part 10 includes an inner plate 100 formed of a plurality of plates partially cut off and

outer plates

210 and 220 overlapping the front and rear of the inner plate 100, and the inner plate ( 100 is disposed so that the cut portions between neighboring plates cross each other, a mixture gas inlet (110a, 130a, 150a, 170a) is formed in the lower portion of the burner body portion 10, the burner body portion 10 of

Internal spaces

120b, 140b, and 160b communicating with the

mixed gas inlets

110a, 130a, 150a, and 170a to form a mixed gas flow path are formed therein, and an upper portion of the burner body 10 is formed in the internal space (

First flame holes

110c, 120c, 130c, 140c, 150c, 160c, 170c communicating with 120b, 140b and 160b to form a flame, and

second flame holes

110d, 120d, 130d, 140d, 150d, 160d, 170d ) Is formed.

The burner body part 10 includes an inner plate 100 having a set

unit plate

110, 120, 130, 140, 150, 160, 170 repeatedly formed of a shape in which a part of a side surface is opened between neighboring plates, and a front surface of the inner plate 100. Is coupled to the rear surface is composed of the outer plates (210, 220) to seal the front and rear surfaces of the mixed gas flow path formed in the inner plate 100.

In addition, the

inner plates

110, 120, 130, 140, 150, 160, 170 and the

outer plates

210, 220 are formed at positions at which a plurality of

fastening holes

114a, 114b, 114c correspond to each other, and penetrates the

fastening holes

114a, 114b, 114c. Are coupled to each other by

fastening members

115a, 115b, and 115c such as bolts, pins, and rivets.

In FIG. 2, reference numerals 110-1, 120-1, 130-1, 140-1, 150-1, 160-1, 170-1, 110-2, 120-2, 130-2, 140-2, 150-2, 160-2, 170-2 are overlapping

plates

110, 120, 130, 140, 150, 160 and 170 of the set unit. It is shown.

The

mixed gas inlets

110a, 130a, 150a, and 170a, which are characteristic features of the present invention, are formed at regular intervals and sizes to allow the mixed gas to flow in a uniform amount throughout the entire area. Accordingly, in the present invention, the mixed gas inlet (110a, 130a, 150a, 170a) is formed at a predetermined interval and size in the structure of the burner body 10 itself even if a separate rectifying plate is not provided unlike the prior art, the mixed gas is Characterized in that the function of the rectifying plate that can be supplied uniformly to each salt hole.

Further, the salt holes are formed in plural at positions spaced apart from each other on the upper portion of the burner body portion 10, and the first salt holes 110c having a relatively small cross-sectional area through which the mixed gas passes based on the advancing direction of the mixed gas are provided. 120c, 130c, 140c, 150c, 160c, 170c are formed in the lower portion, the second salt holes having a relatively large cross-sectional area to the upper side of the first salt holes (110c, 120c, 130c, 140c, 150c, 160c, 170c) 110d, 120d, 130d, 140d, 150d, 160d, and 170d are sequentially connected in series.

Therefore, the mixed gas introduced through the

mixed gas inlets

110a, 130a, 150a, and 170a formed at the lower portion of the burner body 10 passes through the mixed gas flow path formed in the burner body 10. The

first salt holes

110c, 120c, 130c, 140c, 150c, 160c, and 170c are ejected through the

second salt holes

110d, 120d, 130d, 140d, 150d, 160d, and 170d.

As described above, in the present invention, since the salt holes have a dual structure having different cross-sectional areas, stable combustion can be achieved regardless of whether the amount of the combustion gas is large or small.

That is, even when the gas input amount is small, the cross-sectional areas of the

first flame holes

110c, 120c, 130c, 140c, 150c, 160c, and 170c are configured to be small so that the blowing speed of the mixed gas can be maintained at a predetermined speed or more. There is no risk of extinguishing, and on the contrary, even if the gas input amount is large, the cross-sectional area of the

second flame holes

110d, 120d, 130d, 140d, 150d, 160d, and 170d is large so that the blowing speed of the mixed gas is lower than a certain speed. Since it can be maintained as a to prevent the blowing phenomenon or the lifting (Lifting) phenomenon that the flame length is long.

According to this configuration, the turn-down ratio (TDR) indicating the ratio of the maximum gas consumption to the minimum gas consumption can be increased in the gas combustor in which the amount of gas is variably controlled, so that a low to high load range can be obtained. It is possible to perform stable combustion up to the load region.

In the present embodiment, the salt holes have a double structure having different sizes, but the present invention is not limited thereto. Salt holes having a large cross-sectional area from a small cross-sectional area are sequentially connected in series so that the mixed gas passes through salt holes having a small cross-sectional area. If the structure is discharged through the structure in addition to the double structure, it may be composed of a multi-structure, such as triple, quadruple structure, or a structure that is continuously increased in cross-sectional area.

Meanwhile, the bottom support frames 21 and 22 support both sides of the bottom surface in the longitudinal direction of the burner body portion 10 and maintain the overlapped state of the burner body portion 10. The upper surface of the burner body portion 10 is formed with

fitting grooves

21a and 22a corresponding to the shape of both sides of the bottom surface of the burner body portion 10, and the burner body portion 10 is formed inside the

fitting grooves

21a and 22a. Both sides of the bottom are seated and fixed.

In the present embodiment, the inner plate 100 has a structure in which a set unit consisting of the first to seventh

inner plates

110, 120, 130, 140, 150, 160 and 170 is repeatedly arranged three times, and is repeatedly arranged with the number of plates constituting the set unit. The number of recovery is not limited to this, and it is obvious that the number may be modified by varying the number according to the capacity and installation environment of the burner.

Referring to FIG. 3, the first to seventh

inner plates

110, 120, 130, 140, 150, 160, and 170 constituting the inner plate 100 have different shapes, but the rough shapes are the first inner plate 110 and the third inner plate ( 130 and the fifth inner plate 150 and the seventh inner plate 170, and the second inner plate 120 and the fourth inner plate 140 and the sixth inner plate 160 overlapping each other and between them. The structures may be similar to each other.

Each of the

plates

110, 120, 130, 140, 150, 160, 170 has a portion of the communication between the adjacent plate through a gap that is partially cut inwardly to form a flow path of the mixed gas, the flow path of the mixed gas has a small size formed at a predetermined interval to the upper side The

first flame holes

110c, 120c, 130c, 140c, 150c, 160c, and 170c and the

second salt holes

110d, 120d, 130d, 140d, 150d, 160d, and 170d of large size are in communication with each other.

Referring to FIG. 4, the first inner plate 110 includes

body portions

111a and 111b disposed at both sides, and a plurality of salt hole forming portions 112 disposed at predetermined intervals between the

body portions

111a and 111b. And, it is installed in the transverse direction between the body portion (111a, 111b) is composed of a fixing portion 113 for coupling the body portion (111a, 111b) and salt hole forming portion (112).

And the fixing portion 113 is installed in the transverse direction in the middle of the vertical direction of the salt hole forming portion 112, a plurality of mixed gas having the same size at regular intervals along the longitudinal direction at the lower side of the fixing portion 113 An inlet 110a is formed, and the first salt holes 110c and the second salt holes 110d having different sizes are connected in series at an upper side of the fixing part 113.

Here, the

body parts

111a and 111b, the salt hole forming part 112, and the fixing part 113 constituting the first inner plate 110 are merely provided with names and reference numerals for convenience of description, and are integrated. It may be configured as.

Similarly, the third inner plate 130 positioned at the rear of the first inner plate 110 is composed of

body parts

131a and 131b, a salt hole forming part 132, and a fixing part 133. The fifth inner plate 150 and the seventh inner plate 170 may be formed in the same pattern.

Referring to FIG. 5, the second inner plate 120 includes

body portions

121a and 121b disposed at both sides, and a plurality of salt hole forming portions 122 disposed at predetermined intervals between the

body portions

121a and 121b. And a fixing part 123 installed horizontally between the

body parts

121a and 121b to couple the

body parts

121a and 121b and the salt hole forming part 122 to the fixing part 123. The fixing portion 113 of the first inner plate 110 is different from the structure provided in the middle portion of the salt hole forming portion 112 in the horizontal direction in the lower end portion of the false hole forming portion 122.

The upper space of the fixing part 123 is formed in the interior space (120b) that is a flow path of the mixed gas at a predetermined interval along the longitudinal direction, the first salt hole (120c) formed in different sizes on the upper side of the interior space (120b) ) And the second flame hole 120d are connected in series.

Similarly, the fourth inner plate 140 positioned behind the second inner plate 120 includes

body parts

141a and 141b, a salt hole forming part 142, and a fixing part 143. The sixth inner plate 160 positioned may also be configured in the same pattern.

Each of the flow path forming portions constituting the first to seventh

inner plates

110, 120, 130, 140, 150, 160 and 170 are arranged to be mutually staggered with each other and the joint surfaces of the adjacent plates are not coincident with each other, thereby forming a structure in which the flow path of the mixed gas can move to the inner space of the adjacent plates. .

In addition, the positions where the fixing

parts

113, 123, 133, 143, 153, 163 and 173 are coupled to the flow

path forming parts

112, 122, 132, 142, 152, 162 and 172 constituting the

respective plates

11, 120, 130, 140, 150, 160 and 170 as described above are configured such that the patterns spaced up and down alternately between adjacent inner plates alternately. As shown in the lower end portions of the first inner plate 110, the third inner plate 130, the fifth inner plate 150, and the seventh inner plate 170, the mixed gas inlet 110a having a predetermined size at a predetermined interval. 130a, 150a and 170a are formed, and the mixed gas is uniformly distributed and flows through the

mixed gas inlets

110a, 130a, 150a and 170a.

In addition, the mixed gas introduced through the

mixed gas inlets

110a, 130a, 150a, and 170a is formed at an inner middle portion of the second inner plate 120, the fourth inner plate 140, and the sixth inner plate 160.

Internal spaces

120b, 140b, and 160b are formed so that the flow paths are switched in both directions based on 6.

In addition, the upper flow paths of the first inner plate 110, the third inner plate 130, the fifth inner plate 150, and the seventh inner plate 170 are switched back from the

internal spaces

120b, 140b, and 160b. The

first salt holes

110c, 120c, 130c, 140c, 150c, 160c, 170c (see FIG. 9) and the

second salt holes

110d, 120d, 130d, 140d, 150d, 160d, 170d in series. Is formed.

FIG. 7 is a cross-sectional view taken along line BB of FIG. 2, and shows a state in which

mixed gas inlets

110a, 130a, 150a, and 170a are formed at the lower end of the burner body 10, and FIG. 8 is a cross-sectional view taken along line CC of FIG. 2. The

internal spaces

120b, 140b, and 160b through which the mixed gas moves are formed in the middle of the burner body 10, and FIG. 9 is a sectional view taken along the line DD of FIG. 2, and an upper end of the burner body 10 is shown. The

first dye holes

110c, 120c, 130c, 140c, 150c, 160c, and 170c and the

second dye holes

110d, 120d, 130d, 140d, 150d, 160d, and 170d are shown in the drawing.

As described above, in the present invention, after the mixed gas is uniformly distributed and introduced through the

mixed gas inlets

110a, 130a, 150a, and 170a, the mixed gas is configured to be introduced into the salt hole formed at the upper side through the mixed gas flow path, thereby providing the entire area of the burner. The flame is formed uniformly over, thereby improving the combustion stability.

In addition, a plurality of plates in which a portion of the inside is cut out to form a burner body portion, and a flow path of a mixed gas is provided therein to have a structure that communicates with salt holes having a double structure provided on the upper side, and thus accumulation of combustion heat generated during combustion Even if the plate constituting the burner body portion is thermally expanded by absorbing the inflated volume through the space between the overlapping plates it is possible to prevent a large force is applied to the structure fixing the burner body portion and to extend the durability life of the burner.

In addition, in the present invention, a plurality of plates are overlapped to form a burner body portion formed with a mixed gas flow path and salt holes, and after assembling the burner body portion with a fastening member, only the operation of mounting and fixing the side support frame on the bottom support frame is performed. Since the installation work of the burner is completed, it is easy to manufacture the burner and there is an advantage that the manufacturing cost can be reduced.

In addition, in the present invention, by providing a double salt hole having a cross-sectional area of different sizes, there is an advantage that it is possible to always stable combustion regardless of the large or small amount of the gas input for combustion.

Claims

In the premix burner which mixes and combusts combustion gas and air in advance,

A plurality of plates partially cut are overlapped to form a burner body part,

The plurality of plates are arranged such that the cut portions between neighboring plates cross each other so that a mixed gas inlet is formed at one side thereof, and a mixed gas flow passage communicating with the mixed gas inlet is formed therein, and the mixed gas is formed at the other side thereof. A plurality of salt holes are formed in communication with the flow path,

The mixed gas inlet is formed at a predetermined interval and size on one side of the plurality of plates to serve as a self-regulating plate, so that a uniform amount of mixed gas is introduced into the plurality of salt holes connected to the mixed gas inlet. A premix burner with its own rectifier plate.
The method of claim 1,

The burner body unit,

An inner plate in which plates in a set unit repeatedly formed with a shape in which part of a side surface is opened between neighboring plates;

And an outer plate coupled to the front and rear surfaces of the inner plate to seal the front and rear surfaces of the mixed gas flow path.
The method of claim 2,

The inner plate is

Body parts disposed on both sides, and a plurality of salt hole forming parts are arranged at a predetermined interval between the body portion and the salt holes of different sizes formed on the upper side, and installed in the transverse direction between the body parts of the both sides the body portion Pre-mix burner itself provided with a rectifying plate comprising a fixed portion for coupling the plurality of salt hole forming portion.
The method of claim 3,

Bonding surface between the salt hole forming portion of the adjacent inner plate is mutually arranged to pre-mix burner itself provided with a rectifying plate, characterized in that the internal space through which the mixed gas passes.
The method of claim 3,

The salt hole is pre-mixed burner itself provided with a rectifying plate, characterized in that formed by the space between the body portion and the upper end portion of the salt hole forming portion adjacent to the salt hole forming portion.
The method of claim 3,

The fixed part is coupled to the salt hole forming part is spaced up and down between adjacent inner plate, the mixed gas introduced into the mixed gas inlet formed in the lower portion of any one of the inner plate is the flow path is switched by the fixing part to the inner A premix burner having its own rectifying plate, which is ejected through a salt hole formed on the upper side after passing through the inner space of the plate.
The method of claim 1,

The salt hole,

The first salt hole provided at the side into which the mixed gas flows and a second salt hole having a larger cross-sectional area than the first salt hole are sequentially formed in a double structure, and the mixed gas passes through the first salt hole to the second structure. A premix burner having its own rectifying plate, which is ejected through a salt hole.