WO2013073772A1

WO2013073772A1 - Inner and outer flame compound type multistage burner

Info

Publication number: WO2013073772A1
Application number: PCT/KR2012/007396
Authority: WO
Inventors: 최진민
Original assignee: Choi Jin-Min
Priority date: 2011-11-14
Filing date: 2012-09-17
Publication date: 2013-05-23
Also published as: EP2781835A4; KR20130052868A; KR101310535B1; EP2781835A1; CN103492806A; RU2013146204A

Abstract

The present invention relates to an inner and outer frame compound type multistage burner using an outer burner and an inner burner arranged in a center of the inside of the outer burner, and in particular, to an inner and outer frame compound type multistage burner which improves a turn-down ratio and a proportional control characteristic and enables safe ignition and complete combustion by providing a compound flame using the inner flame generated from the outer burner to the inside and the outer flame generated from the inner burner to the outside.

Description

Internal and external flame multi-stage burners

The present invention relates to an inner and outer flame combined multi-stage burner using an inner burner disposed at the inner center of the outer burner and the outer burner, and more particularly, the inner flame and inner burner generated by the outer burner toward the inner side are generated outward. The present invention relates to a multi-stage internal and external multi-stage burner that not only improves the turndown ratio and proportional control characteristics by providing a flame in combination with external flame, but also enables stable ignition and complete combustion.

In general, a burner used in a gas boiler may be divided into a cylindrical burner and a flat burner according to the shape of the burner, among which the cylindrical burner enables stable heat absorption distribution as disclosed in Korean Patent No. 681345 and the like. It is known to optimize and stabilize combustion.

On the other hand, such a gas boiler is set a turn-down ratio (TDR) according to the heating load required by the boiler. The turndown ratio is the ratio of maximum gas consumption to minimum gas consumption in a gas combustion device in which the amount of gas is variably controlled.

For example, if the maximum gas consumption is 30,000 kcal / h and the minimum gas consumption is 6,000 kcal / h, the turndown ratio is 5: 1, and this turndown ratio is how low the minimum gas consumption can be controlled to maintain a stable flame. Limited depending on whether

In the case of gas boilers, the larger the turndown ratio, the more convenient the control of the boiler. That is, in the early stage of combustion, combustion is performed at maximum thermal power in order to reach the target heating temperature within a short time, but when the temperature is approaching the target heating temperature, combustion may be gradually reduced by reducing the amount of gas supplied to the burner.

Accordingly, in Korean Patent No. 851226, 'Combustion device having a cylindrical burner having a multi-stage structure', a distribution plate for uniformly distributing a mixer to a combustion chamber in a gas boiler having a cylindrical burner is formed in a multi-stage structure, and the multi-stage structure is distributed. By adopting each mixer independently in the plate, it is proposed a technique to improve the turndown ratio of the burner.

However, the prior art as described above, although the distribution plate provided in the burner has a multi-stage structure, is still using one burner, and thus it is possible to increase the turndown ratio in the single burner. There is a problem that is fundamentally limited and difficult to control proportionately precisely.

In other words, there is a limit to the minimum gas consumption and the maximum gas consumption that can be provided by only one burner, so there is a fundamental limitation in increasing the turndown ratio with one burner. Independently controlling the mixer has a problem that precise proportional control is difficult.

In addition, when a fuel gas is supplied to one burner and ignited to burn, the burner has a problem of incomplete combustion, which has been a problem in the related art, and at the time of ignition, it has a problem of explosion ignition due to rapid combustion.

The present invention has been proposed to solve the problems described above, and has an outer burner and an inner burner, and uses a flame combined with an inner flame generated by the outer burner toward the inside and an outer flame generated by the inner burner toward the outside. In order to improve the turndown ratio and proportional control characteristics, and to provide a stable internal ignition and complete combustion, an internal and external flame multi-stage burner is provided.

To this end, the internal and external salt composite multi-stage burner according to the present invention is disposed on the outside and the outer burner to generate a flame toward the inside; A first fuel supplier for mixing and supplying primary air for fuel and fuel to the outer burner; An inner burner disposed at an inner central portion of the outer burner and generating a flame toward the outside; A second fuel supplier for mixing and supplying primary air for fuel and fuel to the inner burner; And an ignition device for igniting the supplied fuel.

In this case, the outer burner may include a cylindrical outer wall having upper and lower portions respectively opened; A cylindrical shape having a diameter smaller than that of the outer wall is provided to be spaced apart at a predetermined interval inside the outer wall, and a plurality of flame resistant holes are formed to generate a flame toward the inner side. ; An upper hard plate blocking a space formed between an upper end of the outer wall and an upper end of the inner wall; And an installation hole for blocking the entire lower end of the outer burner and having a second fuel supply connected to the inner burner at a central portion thereof, and around the installation hole for combustion assistance between the inner burner and the outer burner. It is preferable to include; a lower closing plate is formed with a secondary air hole for supplying secondary air.

The air dispersing plate may further include an air dispersing plate spaced apart from each other by a predetermined interval on the lower finishing plate, and the air dispersing plate may have a plurality of air dispersing holes for distributing air rising through the secondary air holes.

In addition, the inner burner is disposed in the inner central portion of the inner wall, the upper portion is blocked and the second fuel supply is connected to the lower portion, the burner body having a flow path therein; And a plurality of external flame holes formed on the side of the burner body and generating flame toward the outside facing the outer burner.

In addition, the first fuel supply is preferably connected to the side of the outer burner, the second fuel supply is preferably connected to the inner burner through the lower portion of the outer burner.

In addition, the first fuel supply is preferably connected to the lower portion of the outer burner, the second fuel supply is preferably connected to the inner burner through the interior of the first fuel supply.

In addition, the ignition device is preferably installed in the combustion chamber between the inner burner and the outer burner to ignite any one of the inner burner or outer burner.

The apparatus may further include a control unit for controlling the first fuel supply unit and the second fuel supply unit, wherein the control unit independently controls the first fuel supply unit and the second fuel supply unit to supply fuel only through the first fuel supply unit. It is preferable to control to supply, to supply fuel only through the second fuel supply, or to supply fuel through both the first fuel supply and the second fuel supply.

The controller may control a turn-down ratio of the fuel supplied through the first fuel supplier and the second fuel supplier.

In addition, the controller controls the fuel to be supplied through the first fuel supply after the fuel is first supplied through the second fuel supply, so that the igniter operates to use the flame generated from the inner burner to burn the outer burner. It is preferable to ignite.

In addition, the ignition device is preferably installed in close proximity to the inner burner to ignite only the inner burner, it is preferable to ignite the outer burner using the external flame generated from the inner burner during ignition.

According to the internal and external salt composite multi-stage burner according to the present invention as described above, the outer flame and the inner burner is provided with a flame by using the inner flame generated by the outer burner toward the inside and the outer flame generated by the inner burner toward the outside. Enable to provide

Therefore, the minimum thermal power (minimum gas consumption) is further lowered and the maximum thermal power (maximum gas consumption) is further increased to increase the turndown ratio, and selectively operate the inner burner and the outer burner to facilitate the proportional control, It plays a role of improving combustion with each other, enabling complete combustion, and igniting a small inner burner first and then igniting a large outer burner to prevent explosion ignition.

1 is a perspective view showing an internal and external salt type multi-stage burner according to a first embodiment of the present invention.

Figure 2 is a cross-sectional view showing the internal and external salt type multi-stage burner according to a first embodiment of the present invention.

Figure 3 is a cross-sectional view showing the internal and external salt type multi-stage burner according to a second embodiment of the present invention.

Figure 4 is a cross-sectional view showing the internal and external salt type multi-stage burner according to a third embodiment of the present invention.

Figure 5 is a cross-sectional view showing the internal and external salt type multi-stage burner according to a fourth embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail for the internal and external salt multi-stage burner according to a preferred embodiment of the present invention.

As shown in Figure 1 and 2, the internal and external salt composite multi-stage burner 100 according to the first embodiment of the present invention is disposed on the outside to generate a flame toward the inner burner 110 and the outer burner A first fuel supplier 120 for supplying a mixed gas as a fuel to the 110, an inner burner 130 and an inner burner 130 disposed at an inner central portion of the outer burner 110 to generate a flame toward the outside. And a second fuel supplier 140 supplying a mixed gas as a fuel.

In addition, an ignition device (not shown) for igniting the mixed gas provided from the first fuel supply 120 or the second fuel supply 140 as described above, and if the ignition is made by the ignition device outer burner 110 ) Generates a flame toward the inner side to generate 'inner flame', and the inner burner 130 generates a flame toward the outer side to generate a 'foreign flame'.

However, the definitions of 'inner flame' and 'foreign salt' are based on the initial direction of the flame when the mixed gas is combusted.Inner flame and external flame which started to be ejected to the inner and outer sides respectively are naturally upper side after the nature of the flame. It is clear that it will rise.

In addition, the inner burner 130 and the outer burner 110 includes a control unit 150 for controlling the ignition of the ignition or the supply of the mixed gas, the supply amount, and the like, and the internal and external salt complex multi-stage according to the present invention by the control unit 150 The burner 100 can be adaptively controlled according to the load.

More specifically, the outer burner 110 is disposed on the outside of the burner of the present invention consisting of multiple stages, and has a relatively large output compared to the inner burner 130 to eject the flame toward the inner burner 130. do.

The outer burner 110 has a cylindrical outer wall 111 having upper and lower portions respectively open, an inner wall 112 provided at regular intervals in an inner direction of the outer wall 111, and an upper end portion and an inner wall 112 of the outer wall 111. The upper hard plate 113 and the lower closing plate 114 to block the entire lower end of the outer burner 110 is blocked between the upper end of the.

The inner wall 112 has a cylindrical shape having a smaller diameter than the outer wall 111 to form a space in which the mixed gas supplied from the first fuel supplier 120 flows between the inner wall 112 and the outer wall 111 spaced apart from each other. In addition, a plurality of flame resistant holes 112a are formed along the circumferential direction, and the mixed gas is ejected through the wall surface.

However, the mesh and the porous plate (112b of FIG. 2) are sequentially stacked on the outer circumferential surface of the inner wall 112 to more uniformly disperse the mixed gas supplied through the flow path between the outer wall 111 and the inner wall 112. It is preferable.

A plurality of fine holes are formed in the mesh, and a plurality of through holes are formed in the porous plate so that the mesh can be used for fixing the mesh. Such a mesh and a porous plate are described in more detail in Korean Patent No. 681345 filed by the present applicant.

The upper hard plate 113 is fixed to seal between the upper end of the outer wall 111 and the inner wall 112, and a mounting groove having a predetermined depth is formed so that a cylindrical heat exchanger (not shown) is inserted directly into the pedestal. Play a role. Therefore, the structure of the boiler is simplified by eliminating the need for a separate heat source supply device or heat exchanger installation port.

The lower closing plate 114 is configured to block the entire lower end of the outer burner 110 as well as between the lower end of the outer wall 111 and the lower end of the inner wall 112, the installation hole (H) is formed in the center, The secondary air hole 114a is formed in the circumferential direction around the installation hole H.

Therefore, the second fuel supply 140 connected to the inner burner 130 is installed through the installation hole H, and the inner burner 130 and the outer burner 110 are provided through the secondary air hole 114a. To supply secondary air for combustion aid.

Secondary air assists complete combustion by supplying the appropriate amount of air necessary for complete combustion in combustion of a mixed gas (gas + fuel primary air) as fuel, and after rising through the secondary air hole 114a The combustion chamber, which is a space portion between the inner burner 130 and the outer burner 110, is reached.

The lower closing plate 114 is configured to block the entire lower end of the outer burner 110, so that the appropriate amount of secondary air is supplied only through the secondary air hole 114a, and the second fuel supply 140 is installed Since it is desirable to be installed through (H), other structures may be adopted without considering this.

In addition, when the air dispersion plate 115 having a plurality of air dispersion holes 115a is further provided above the lower closing plate 114, the air that has risen through the secondary air holes 114a may be disposed in the air dispersion holes ( It is further dispersed by 115a) and will be uniformly supplied throughout the combustion chamber.

To this end, the number of air dispersion holes 115a is generally larger than that of the secondary air holes 114a and the size of each of the air dispersion holes 115a is relatively smaller than that of the secondary air holes 114a.

The first fuel supply unit 120 supplies a mixed gas of primary air and gas for fuel to the outer burner 110, and as an example, a first venturi tube 121 and the first venturi tube ( And a first air hole 123 formed through the side of the first venturi tube 121 and the first nozzle 122 coupled to 121.

The first venturi tube 121 is connected to the lower portion (ie, the lower surface) of the outer burner 110, and the open end of the first venturi tube 121 is an empty space between the outer wall 111 and the inner wall 112. It is supposed to communicate with the flow path.

Therefore, as indicated by the arrow (solid line) in FIG. 2, the mixed gas supplied through the lower side of the outer burner 110 flows to the side of the outer burner 110, and then the porous plate, the mesh, and the flame resistant flame hole 112a are opened. Passed through and ejected sequentially. Since the secondary air hole 114a is formed only in a portion of the lower closure plate 114, the mixed gas flows up through the portion without the secondary air hole 114a.

The first nozzle 122 is installed in the branch pipe provided on the side of the first venturi tube 121 to supply gas, and the first air hole 123 is formed through the branch pipe so as to provide a fuel. Since the primary air is introduced, the mixed gas in which the primary air and the gas are mixed is supplied to the outer burner 110.

The inner burner 130 is disposed at the inner center of the outer burner 110 (exactly, the inner inner part of the inner wall 112), and generates external flames facing the outer burner 110. 131 and the external flame salt hole 132 formed along the side of the body 131.

The body 131 is formed in a hollow cylindrical shape as shown as an example, the upper portion is blocked and the second fuel supply 140 is connected to the lower portion. Therefore, the mixed gas supplied from the second fuel supplier 140 passes through the flow path inside the body 131 and then is discharged through the external flame hole 132.

The external flame salt hole 132 uniformly supplies the mixed gas along the entire circumferential direction of the body 131, and the inner burner 130 is relatively smaller than the outer burner 110, and thus the body 131 of the inner burner 130. If the external flame salt hole 132 is formed in the number is less than the flame salt hole 112a of the outer burner (110). Therefore, the inner burner 130 can be used having a smaller output (capacity or flame ejection amount) than the outer burner 110.

The second fuel supplier 140 supplies a mixed gas composed of primary air and gas for fuel to the inner burner 130, and as an example, a second venturi tube 141 and the second venturi tube 141. The second nozzle 142 coupled to the second and the second air hole 143 formed through the side of the second venturi tube 141.

The second venturi tube 141 is installed through the lower portion of the outer burner 110 (ie, the lower surface), and the open end of the second venturi tube 141 is connected to the body 131 of the inner burner 130. Thus, the mixed gas is supplied to the inner burner 130.

In particular, the second venturi tube 141 is smaller than the diameter of the first venturi tube 121 and is connected to the inner burner 130 as described above in the state inserted into the first venturi tube 121. When the first venturi tube 121 and the second venturi tube 141 are configured as a double tube as described above, the first venturi tube 121 is installed at the side of the outer burner 110 and the second venturi tube 141 is provided. The size of the burner is smaller than that of the case where the outer burner 110 is installed below.

The second nozzle 142 is provided at the end of the second venturi tube 141 to supply gas, and the second air hole 143 is formed through the side of the second venturi tube 141 to provide fuel. Since primary air is introduced, the mixed gas in which the primary air and the gas are mixed is supplied to the inner burner 130.

In the above description, the first fuel supply unit 120 and the second fuel supply unit 140 have been formed of

venturi tubes

121 and 141,

nozzles

122 and 142, and

air holes

123 and 143, respectively. As is already known, since the fuel supply unit has various structures, other modifications may be applied to the present invention except that the second venturi tube 141 is disposed inside the first venturi tube 121.

For example, even if the first air hole 123 or the second air hole 143 is not formed separately, the mixed gas premixed with the primary air and the gas may be directly passed through the first nozzle 122 or the second nozzle 142. Instead of supplying or installing the first nozzle 122 to the branch pipe of the first venturi tube 121, the branch nozzle is inserted between the inner circumferential surface of the first venturi tube 121 and the outer circumferential surface of the second venturi tube 141. Configurations that make it unnecessary will also be applicable.

An ignition device (not shown) ignites the mixed gas ejected through the flame flame hole 112a of the outer burner 110 or the mixed gas sprayed through the flame flame hole 132 of the inner burner 130 to burn the mixed gas. In general, a method of generating sparks by electricity such as an ignitor is used.

Such an ignition device is preferably installed in the combustion chamber, which is an empty space between the outer burner 110 and the inner burner 130, although the illustration is omitted in the present invention, the ignition device itself is already known as Korean Patent No. 681345 And various documents.

The controller 150 controls the ignition of the inner burner 130 and the outer burner 110, the supply of the mixed gas, the supply amount, and the like, and the internal and external salt composite multi-stage burner 100 according to the present invention according to the capacity of the load. Adaptive control

For example, the controller 150 independently controls the first fuel supply 120 and the second fuel supply 140 to supply fuel only through the first fuel supply 120 or the second fuel supply 140. The fuel is supplied through only, or by controlling to supply fuel through both the first fuel supply 120 and the second fuel supply 140 to perform proportional control according to the capacity of the load.

In addition, the controller 150 controls the inner burner 130 and the outer burner 110 by finely controlling the amount of fuel supplied through the first fuel supply 120 and the second fuel supply 140 according to the load. Each turndown ratio is adjusted, as well as the turndown ratio of the inner burner 130 and the outer burner 110 as a whole.

In addition, the controller 150 controls the fuel to be supplied through the first fuel supplier 120 after the fuel is first supplied through the second fuel supplier 140, thereby using a small capacity inner burner 130 using the ignition device. First to ignite, it is possible to ignite the outer burner 110 having a large capacity by using the external flame uniformly ejected from the inner burner 130 in all directions.

As described above, the present invention uses the control unit 150 to operate any one of the outer burner 110 and the inner burner 130 (preferably the inner burner which is relatively small compared to the outer burner). It allows for a lower minimum firepower (minimum gas consumption).

In addition, when using both the outer burner 110 and the inner burner 130 to operate as a multi-stage burner consisting of two burners, the thermal power of the outer burner 110 and the inner burner 130 is summed, so that the maximum thermal power ( Maximum gas consumption).

That is, the present invention makes it possible to increase the turndown ratio, 'the ratio of the maximum gas consumption to the minimum gas consumption,' in a gas burner in which the amount of gas is variably adjusted.

In addition, the controller 150 may adjust the amount of the mixed gas supplied to the outer burner 110 and the inner burner 130, respectively, the turndown ratio of the outer burner 110, the turndown ratio of the inner burner 130, Alternatively, the turndown ratio of the multi-stage burner in which the outer burner 110 and the inner burner 130 are combined can be freely adjusted, thereby improving the proportional control characteristic.

For example, if the area ratio of the flame resistant holes 112a to the total salt hole area ratio 100% is 70% and the external salt hole 132 area ratio is 30% (other ratios such as 65% to 35% are possible), the outer burner ( It can be operated at 70% using only 110, or at 30% using only inner burner 130, or at 100% using both outer burner 110 and inner burner 130, wherein If the amount of mixed gas supplied to each of the

burners

110 and 130 is adjusted, the turndown ratio can be increased while allowing precise proportional control.

In addition, by installing the inner burner 130 in the empty space inside the outer burner 110, the burner is not changed in size but constitutes a multi-stage burner, through the secondary air holes 114a provided at one place. Since secondary air is supplied between the outer burner 110 and the inner burner 130, it is possible to prevent the burner from increasing in size.

In addition, since the second venturi tube 141 of the second fuel supplier 140 is inserted into and installed inside the first venturi tube 121 of the first fuel supplier 120, the first venturi tube 121 is an outer burner ( It is installed on the side of the 110, the second venturi tube 141 makes it possible to prevent the width of the burner as a whole larger than when installed in the lower portion of the outer burner (110).

In addition, when the flame of the outer burner 110 is incompletely burned, complete combustion occurs by the outer flame of the inner burner 130. On the contrary, when the flame of the inner burner 130 is incompletely burned, the outer burner 110 is burned. Complete combustion is achieved by flame resistance, which prevents incomplete combustion as a whole.

In addition, the inner burner 130 having a relatively small capacity (low power) is first ignited using an ignition device, and the fuel being ejected from the outer burner 110 is ignited by the external flame being uniformly ejected from the inner burner 130, thereby causing explosion. Prevention and natural ignition.

For this ignition, when the controller 150 controls the mixed gas to be supplied to the inner burner 130 first and the mixed gas to be supplied to the outer burner 110 after a predetermined time, the inner burner 130 is first burned and ejected. The method of igniting the inner burner 130 with the external salt may be used.

Of course, by installing the ignition device close to the inner burner 130 so that the ignition device can only ignite the inner burner 130, a method of igniting the outer burner 110 with the external flame generated from the inner burner 130 may be used. However, in this case, there is a disadvantage in that only the outer burner 110 cannot be ignited.

Hereinafter, an internal and external salt composite multistage burner according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

The second embodiment of the present invention differs in that the body shape of the flame resistant burner is different from that of the first embodiment of the present invention.

As shown in FIG. 3, the internal and external salt composite multi-stage burner 100 according to the second embodiment of the present invention includes an outer burner 110, a first fuel supply 120, an inner burner 130, 2 includes a fuel supply 140 and an ignition device, as described above.

However, in the second embodiment of the present invention, the body 131 ′ of the inner burner 130 has a tapered cylindrical shape such that its diameter gradually decreases toward the upper side.

Therefore, since the tapered cylindrical body 131 ′ has a smaller surface area than a general cylindrical shape, only the inner burner 130 can operate to lower the minimum gas consumption, thereby reducing the burner output. Make it more convenient.

That is, for example, when the external flame salt hole 132 is formed in the general cylindrical body (131 of FIG. 2), the salt salt area ratio is 30% compared to 100% of the total salt, and the external salt is tapered into the cylindrical body 131 '. Forming the salt holes 132 ′ can be lowered to 25%, further lowering the minimum gas consumption.

Hereinafter, an internal and external salt composite multi-stage burner according to a third embodiment of the present invention will be described with reference to the accompanying drawings.

Compared to the first embodiment of the present invention, the third embodiment of the present invention replaces a portion of the lower closure plate that blocks the entire lower portion of the outer burner with a secondary air plate, and that the first fuel supply has a side portion of the external flame burner. The difference is that they are connected via.

As shown in FIG. 4, the internal and external salt multi-stage burner according to the third embodiment of the present invention includes an outer burner 210, a first fuel supply 220, an inner burner 230, and a second fuel supply. 240 and an ignition device or the like, as described above.

However, the lower closing plate 214 in the third embodiment of the present invention blocks only the lower end portion between the outer wall 211 and the inner wall 212 of the outer burner 210 of the entire lower portion of the outer burner 210, and the remaining portion. Is comprised so that it may be blocked by the secondary air plate 215 in which the secondary air hole 2154a is formed.

However, if the lower closing plate 214 and the secondary air plate 215 are integrally formed, the outer burner (110 of FIG. 2) is connected to one lower closing plate (114 of FIG. 2) as in the first embodiment of the present invention. It will be apparent that it is substantially the same as blocking the entire bottom.

In addition, in the third embodiment of the present invention, the first fuel supply 220 is connected to the side of the outer burner 210. For this purpose, the first venturi tube 221 is disposed between the outer wall 211 and the inner wall 212. The first venturi tube 221 is provided to communicate with the flow path of the second nozzle 222 and the second air hole 223 is provided to supply the mixed gas.

In this case, however, the width of the burner is increased by the length of the first fuel supplier 220.

In addition, when the mixed gas supplied along the first venturi tube 221 goes straight in the horizontal direction (based on the drawing), the dispersion degree will be lowered, so that a baffle 216 is installed perpendicular to the moving direction of the mixed gas. do.

Therefore, the flow path of the mixed gas is increased to better mix the primary air and the gas, and the mixed gas is supplied to the flame resistant holes 212a while the mixed gas is raised so that the mixed gas is uniformly supplied to the flame resistant holes 212a. It would be desirable.

Hereinafter, an internal and external salt composite multistage burner according to a fourth embodiment of the present invention will be described with reference to the accompanying drawings.

The fourth embodiment of the present invention differs in that the body shape of the flame resistant burner is different from that of the third embodiment of the present invention.

As shown in FIG. 5, the internal and external salt multi-stage burner according to the fourth embodiment of the present invention includes an outer burner 210, a first fuel supply 220, an inner burner 230, and a second fuel supply. 240 and an ignition device or the like, as described above.

However, in the second embodiment of the present invention, the body 231 'of the inner burner 230 is formed in a cylindrical shape, but is formed in a tapered cylindrical shape so that its diameter gradually decreases toward the upper side.

Therefore, the tapered cylindrical body 231 'can further lower the minimum gas consumption compared to the general cylindrical shape. Since this has already been described above, a detailed description thereof will be omitted.

In the above, the specific Example of this invention was described above. However, the spirit and scope of the present invention is not limited to these specific embodiments, and various changes and modifications can be made without departing from the spirit of the present invention. Those who have it will understand.

Therefore, since the embodiments described above are provided to completely inform the scope of the invention to those skilled in the art, it should be understood that they are exemplary in all respects and not limited. The invention is only defined by the scope of the claims.

Claims

An outer burner disposed outside and generating a flame toward the inside;

A first fuel supplier for mixing and supplying primary air for fuel and fuel to the outer burner;

An inner burner disposed at an inner central portion of the outer burner and generating a flame toward the outside;

A second fuel supplier for mixing and supplying primary air for fuel and fuel to the inner burner; And

Ignition device for igniting the supplied fuel; internal and external flame combined multi-stage burner comprising a.
The method of claim 1,

The outer burner,

A cylindrical outer wall each having an upper and lower portion open;

A cylindrical shape having a diameter smaller than that of the outer wall is provided to be spaced apart at a predetermined interval inside the outer wall, and a plurality of flame resistant holes are formed to generate a flame toward the inner side. ;

An upper hard plate blocking a space formed between an upper end of the outer wall and an upper end of the inner wall; And

The entire lower end of the outer burner is blocked, and an installation hole through which a second fuel supply connected to the inner burner is formed is formed in the center, and around the installation hole is provided for combustion assistance between the inner burner and the outer burner. Inner and outer flame combined multi-stage burner comprising a; a lower closing plate is formed with a secondary air hole for supplying secondary air.
The method of claim 2,

Inner and outer flame characterized in that it further comprises an air dispersion plate installed on the lower finishing plate spaced apart at a predetermined interval, the air dispersion plate is formed with a plurality of air dispersion holes for dispersing the air rising through the secondary air hole Combined multi-stage burners.
The method of claim 2,

The inner burner,

A burner body disposed at an inner central portion of the inner wall, the upper portion of which is blocked and the second fuel supplier connected to a lower portion of the inner wall, and having a flow passage therein; And

It is formed on the side of the burner body a plurality, the external flame salt hole for generating a flame toward the outside facing the outer burner; internal and external salt complex multi-stage burner comprising a.
The method of claim 1,

And the first fuel supply is connected to the side of the outer burner, and the second fuel supply is connected to the inner burner through the lower portion of the outer burner.
The method of claim 1,

And the first fuel supply unit is connected to a lower portion of the outer burner, and the second fuel supply unit penetrates the inside of the first fuel supply unit and is connected to the inner burner.
The method of claim 1,

The ignition device is installed in the combustion chamber between the inner burner and the outer burner, the internal and external flame combined multi-stage burner, characterized in that for igniting any one of the inner burner or the outer burner.
The method according to any one of claims 1 to 7,

And a control unit for controlling the first fuel supply and the second fuel supply, wherein the control unit independently controls the first fuel supply and the second fuel supply to supply fuel only through the first fuel supply. And the internal and external flame combined multi-stage burners characterized in that the fuel is supplied only through the second fuel supply, or the fuel is supplied through both the first fuel supply and the second fuel supply.
The method of claim 8,

The control unit is an internal and external salt type multi-stage burner, characterized in that for controlling the supply amount of the fuel supplied through the first fuel supply and the second fuel supply (turn-down ratio).
The method of claim 8,

The controller controls the fuel to be supplied through the first fuel supply after the fuel is first supplied through the second fuel supply, thereby igniting the outer burner using the flame generated from the inner burner by operating the ignition device. Inner and outer flame complex multi-stage burner, characterized in that.
The method according to any one of claims 1 to 7,

The ignition device is installed in close proximity to the inner burner to ignite only the inner burner, the inner and outer flame combined multi-stage burner, characterized in that for igniting the outer burner using the outer flame generated from the inner burner during ignition.