WO2013085156A1

WO2013085156A1 - Combustion device

Info

Publication number: WO2013085156A1
Application number: PCT/KR2012/009560
Authority: WO
Inventors: 민태식
Original assignee: 주식회사 경동나비엔
Priority date: 2011-12-05
Filing date: 2012-11-13
Publication date: 2013-06-13
Also published as: KR101303126B1; KR20130062554A

Abstract

The objective of the present invention is to provide a combustion device, which can cool a combustion chamber without using an insulation material, preventing generation of condensed water while using a pre-mixed burner, and in which a flow path connection structure between gas and air can simplified. To this end, the present invention relates to the combustion device comprising: a blower for supplying air; a burner for combusting a mixture of the air and the gas; and a heat exchanger in which heat exchange with water inside takes place by means of combustion heat of the burner, wherein the burner comprises a center portion that is placed at the center of the burner, and a periphery portion that encases the center portion, wherein the mixture of air is combusted in the center portion of the burner, only air is exhausted from the periphery portion of the burner, and wherein a flow path connection portion is provided between the burner and the blower, the flow path connection portion comprising a first flow path connection member provided with a first air passage therein that connects to the center portion, and a second flow path connection member provided with a gas inlet portion into which gas that is supplied to a second air passage that connects to the periphery portion and the first air passage is introduced.

Description

Combustion device

The present invention relates to a combustion apparatus, and more particularly, to a method for cooling a combustion chamber without using a heat insulating material by using a part of air supplied from a blower for cooling the combustion chamber, To a combustion device.

2. Description of the Related Art Generally, a combustion apparatus is provided in a heating apparatus that uses water for heating by using heat of combustion generated by combustion of fuel and circulates heated water along a pipe to be used for indoor heating or hot water.

Such a combustion apparatus is provided with a burner for burning fuel gas to generate high-temperature thermal energy and a combustion chamber for burning the mixer by the flame generated in the burner.

In this case, when the high-temperature thermal energy generated in the combustion chamber is transmitted to the outside of the combustion chamber, heat is damaged in the combustion chamber peripheral device. Therefore, a device for cooling the combustion chamber is required to prevent this.

As a device for cooling the combustion chamber, a conventionally used structure can be classified into a dry type using a heat insulating material on the inner wall of the combustion chamber housing and a wet type having a heating water pipe wound on the outer wall of the combustion chamber housing have.

1 is a cross-sectional view showing a conventional dry combustion chamber cooling method.

A burner 11 is disposed at the center of the combustion chamber 10 for mixing and combusting the introduced gas and air. The outer wall of the combustion chamber 10 is formed of a combustion chamber housing 12, A heat insulating material 13 is attached.

The heat insulating material 13 prevents the combustion chamber from being discharged to the outside through the combustion chamber housing 12. [ Also, the heat insulating material 13 prevents the combustion chamber housing 12 from being corroded due to the high temperature combustion chamber.

Such a combustion chamber cooling apparatus has a simple structure, but has a problem in that the cost of manufacturing the combustion chamber increases due to the use of the heat insulating material, and the cooling effect of the combustion chamber is not large even when the heat insulating material is used.

2 is a cross-sectional view showing a conventional wet combustion chamber cooling method.

A heating water pipe 23 through which the heating water flows is wound around the side surface of the combustion chamber 20 in a state of being in contact with the outer periphery of the combustion chamber housing 22. [ Some of the heat is absorbed into the heating water circulating in the heating water pipe 23 in the course of the high temperature heat generated in the combustion chamber 20 being radiated to the outside of the combustion chamber 20. [

In the wet combustion furnace cooling system, since the heating water circulating through the heating water pipe 23 absorbs heat and flows into the heat exchanger (not shown) in a preheated state, the heat efficiency of the heat exchanger can be improved There are advantages.

However, in the conventional wet combustion chamber cooling method, the thermal efficiency is higher than that of the dry type, but the structure is complicated, and condensed water may be generated on the inner wall of the combustion chamber 20. In order to solve such a problem, there is a problem that it is difficult to manufacture a condensed water-resistant material (for example, stainless steel).

In addition, in the case of using the premixed burner, the generation of nitrogen oxides (NOx) can be reduced. However, since the amount of excess air is small, the dew point temperature is high and condensed water may be generated. If such condensed water is generated in a general water heater, it may cause problems such as corrosion.

Also, a gas inlet port through which the gas flows, an air flow passage through which the air is supplied from the blower, and a structure in which the gas and the air are mixed are formed between the burner and the blower, so that the structure is complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method and apparatus for cooling a combustion chamber without using a heat insulating material, And to provide a combustion device capable of realizing the above-mentioned advantages.

In order to achieve the above object, the present invention provides a combustion apparatus comprising: a blower (100) for supplying air; a burner (300) for burning a mixture of the air and the gas; And a heat exchanger (500) for exchanging heat with water inside the burner (300), wherein the burner (300) comprises a central portion located at the center of the burner and a peripheral portion surrounding the central portion; At the center of the burner 300, the mixer is burned and only the air is blown out at the periphery of the burner; A first air passage connecting member 210 having a first air passage 210a connected to the center portion and a second air passage 225 connected to the peripheral portion are provided between the burner 300 and the blower 100, And a second flow path connecting member 220 having a gas inlet 223 through which the gas supplied to the first air path 210a flows.

According to the combustion apparatus of the present invention, since the flow path connecting portion composed of the first flow path connecting member and the second flow path connecting member is provided between the burner and the blower, the flow path structure of gas and air is simplified, have.

In addition, a part of the air supplied from the blower passes through the space between the outer wall of the combustion chamber and the inner wall of the combustion chamber to cool the combustion chamber to be supplied to the combustion chamber, and a part of the air is blown out to the inner side of the inner wall of the combustion chamber. Structure can be implemented.

Also, by using the premixed burner, it is possible to reduce the generation of NOx while supplying excess air to the exhaust gas, thereby reducing the dew point temperature and preventing the generation of condensed water.

Further, the air supplied from the blower is separated into the burner and the combustion chamber, and the air is transferred, thereby reducing the load on the blower.

1 is a cross-sectional view showing a conventional dry combustion chamber cooling method

2 is a cross-sectional view showing a conventional wet combustion chamber cooling method

3 is an external perspective view showing a combustion apparatus according to the present invention.

Fig. 4 is an exploded perspective view of the combustion apparatus shown in Fig. 3

5 is a cross-sectional view taken along line A-A of the combustion apparatus shown in Fig. 3

6 is a cross-sectional view taken along line B-B of the combustion apparatus shown in Fig. 3

7 is a perspective view showing a cross-sectional shape in a state where the first flow path connecting member and the second flow path connecting member are engaged;

8 is a perspective view showing a cross-sectional shape of the first passage connecting member

9 is a perspective view showing an outer shape of the second flow path connecting member

** Explanation of symbols **

100: blower 200:

210: first passage connecting member 210a: first air passage

211: air inflow portion 211a: groove

211b: shaft portion 212: passage portion

213: flange 214: communicating hole

220: second flow path connecting member 220a: space

221: flange 222: body

223: gas inlet 225: second air passage

300: Burner 310: Burner chamber

311: mixing space 320: burner salt flushing

350: air connection channel 370: air outlet

400: combustion chamber 410: combustion chamber inner wall

411: air outlet 420: combustion chamber outer wall

430: Cooling channel 500: Heat exchanger

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is an external perspective view showing a combustion apparatus according to the present invention, and FIG. 4 is an exploded perspective view of the combustion apparatus shown in FIG.

A combustion apparatus (1) according to the present invention includes a blower (100) for supplying air, a flow path connection part (200) for connecting a flow path for gas flow and a flow path for transferring the air, A burner 300, a combustion chamber 400 in which combustion is performed by the flame formed in the burner 300, and a heat exchanger 500 in which heat is exchanged between the combustion gas generated in the combustion chamber 400 and water.

The blower 100 is for supplying air to the burner 300 by sucking outside air, and is the same as the structure that is conventionally used.

The flow path connection part 200 is connected to an outlet end of the blower 100. The flow path connection part 200 includes a first flow path connection part 210a in which a first air path 210a through which a part of the air supplied from the blower 100 and a gas supplied from a gas supply part (not shown) And a second air passage 225 (see FIG. 5) in which the first air passage connecting member 210 is inserted and a second air passage 225 (see FIG. 5) through which the rest of the air supplied from the blower 100 passes is formed, A gas inlet 223 through which the gas flows from the gas supply unit is formed at one side of the second flow channel connecting member 220 and a gas inlet 223 through which the gas The air is introduced into the first air passage 210a through the first air passage 210a while being mixed with air and gas and is transferred only through the second air passage 225. [

The burner 300 includes a burner chamber 310 in which air and gas are mixed in an internal mixing space 311 (see FIG. 5), and a burner chamber 310 disposed above the burner chamber 310 to generate a flame (320). The burner chamber 310 constitutes the body of the burner, and air and gas are mixed to provide an air flow path through which the air moves.

The combustion chamber 400 includes combustion chamber

outer walls

420a and 420b that form cooling passages 430 (see FIG. 5) between the combustion chamber inner walls 410a and 410b and the combustion chamber inner walls 410a and 410b. The cooling passage 430 absorbs high-temperature heat generated in the space inside the combustion chamber while passing a part of the air supplied from the blower 100.

The heat exchanger 500 provided at the upper side of the combustion chamber 400 is heat exchanged by a high temperature combustion gas and the combustion gas having heat exchanged in the heat exchanger 500 is exhausted through an exhaust hood .

Fig. 5 is a cross-sectional view taken along line AA of Fig. 3, Fig. 6 is a cross-sectional view taken along line BB of Fig. 3, and Fig. 7 is a perspective view showing a cross- FIG. 8 is a perspective view showing a cross-sectional shape of the first passage connecting member, and FIG. 9 is a perspective view showing an outer shape of the second passage connecting member.

7 to 9, the first passage connecting member 210 and the second passage connecting member 220 will be described.

The first flow path connecting member 210 has the air inlet 211 and the

passages

212 and 212 so that the internal space of the first flow path connecting member 210 forms the first air path 210a and is inserted into the second flow path connecting member 220. [ And a flange 213.

The air inlet 211 is inserted into the second flow channel connecting member 220 so as to face the blower 100 so that the sectional area of the inlet side of the air inlet 211 is larger and the cross- . A hermetic member (not shown) for maintaining airtightness is interposed between the outer circumferential surface of the air inlet 211 and the inner circumferential surface of the second flow channel connecting member 220. For this purpose, A groove 211a into which the hermetic member is inserted is formed. An axial pipe portion 211b is formed on the upper side of the air inlet 211 where the groove 211a is formed, so that the sectional area is reduced.

The passage portion 212 has an enlarged shape in which the diameter increases from the inlet side through which the air passes to the outlet side. A plurality of communication holes 214 are formed along the circumference at the boundary between the passage portion 212 and the air inlet 211. The communication hole 214 is for introducing the gas introduced from the gas inlet 223 into the first air passage 210a which is an internal space of the passage portion 212. [ Since the communication hole 214 performs a venturi function, mixing of the gas introduced through the communication hole 214 and air passing through the inside of the passageway 212 is promoted.

The communicating hole 214 is formed such that the diameter of the shaft portion 211b is smaller than the lower end 212a of the passage portion 212 and the inner surface of the lower end portion 212a of the passage portion 212 is concave, Thereby forming a depression 215 to be convex. The depressed portion 215 is formed to have a predetermined area on the inner peripheral surface of the passage portion 212. Due to such a constitution, the gas flowing into the passage portion 212 through the communication hole 214 becomes the same as the air flowing through the first air passage 210a, so that the gas can flow easily have.

A flange 223 is formed at the air outlet side end of the passage portion 212 to be coupled to the upper end of the second flow path connection member 220 by a fastening member.

The second channel connecting member 220 is provided with a body 222 having a substantially rectangular cross section and a space 220a passing through the center of the body 222 in the longitudinal direction is formed, The first channel connecting member 210 is inserted.

A gas inflow port 223 through which the gas flows is formed on the side of the body 222 and a plurality of second air passages 225 are formed along the longitudinal direction of the body 222.

The second air passage 225 is a channel through which some air from the air supplied from the blower 100 passes and is formed as a channel passing through the bottom surface of the flange 221 along the longitudinal direction of the body 222, So that the air flows into the air inlet 225a, passes through the air passage 225b, and is discharged to the air outlet 225c. The second air passage 225 is located at four corners along the center space 220a and the air inlet 225a is substantially triangular in cross section. The air outlet 225c is formed laterally at an upper end of the air passage 225b so as to eject air in a lateral direction of the body 222. [

The flow path connection structure inside the combustion apparatus will be described with reference to FIGS. 5 and 6. FIG.

A part of the air supplied from the blower 100 flows into the first air passage 210a of the first flow path connecting member 210 and the gas introduced from the gas inlet 223 flows into the first flow path connecting member 210, Passes through the communication hole 214 via the space 220a formed between the outer circumferential surface of the second air passage connecting member 220 and the inner circumferential surface of the second flow passage connecting member 220 and then flows into the

first air passage

210a, 210a. &Lt; / RTI > The thus formed mixer is introduced into the mixing space 311 of the burner 300 and then supplied to the burner salt flame 320 serving as the central portion of the burner 300 to be burned.

On the other hand, the rest of the air supplied from the blower 100 flows through the second air passage 225 formed in the body 222 of the second flow passage connecting member 220 between the combustion chamber outer wall 420 and the burner chamber 310 And then flows into the formed air connecting passage 350. The air introduced into the air connecting passage 350 is formed on the upper side thereof and is blown out to the upper side through an air blowing port 370 which is a peripheral portion of the burner 300.

That is, the mixer is burned at the central portion of the burner 300, and only air is blown out at the periphery of the burner 300.

In this case, the air blowing port 370 is formed between the edge of the burner flame 320 and the lower end of the combustion chamber inner wall 410, And a second air blowing port 370b connected thereto.

The air ejected from the first air ejection port 370a is conveyed to the cooling passage 430 and the air ejected from the second air ejection port 370b is ejected upward along the inner surface of the combustion chamber inner wall 410. [ Therefore, the combustion heat of the high temperature due to the combustion in the burner salt flame 320 is prevented from being transmitted to the combustion chamber inner wall 410.

A plurality of air outlets 411 are formed in the inner wall 410 of the combustion chamber. Therefore, the air supplied through the cooling passage 430 is blown into the inner space of the combustion chamber through the air outlet 411.

Accordingly, the temperature of the inner wall 410 of the combustion chamber is prevented from being transferred to the outer wall 420 of the combustion chamber by the cooling passage 430 while the inner surface of the inner wall 410 of the combustion chamber 410 is blown out through the second air- The temperature of the air flowing upward through the air inlet 411 of the combustion chamber inner wall 410 is mixed to prevent an increase in temperature.

According to this structure, the high temperature inside the combustion chamber is blocked from being transferred to the combustion chamber inner wall 410 by the air rising along the inner surface of the combustion chamber inner wall 410, and the temperature of the combustion chamber inner wall 410 is reduced by the cooling flow passage 430 It is not necessary to use a heat insulating material to cool the combustion chamber because it is blocked from being transmitted to the combustion chamber outer wall 420.

In addition, the air blown from the air blowing port 411 of the combustion chamber inner wall 410 to the air flowing upward along the inner surface of the combustion chamber inner wall 410 can be mixed to further improve the combustion chamber cooling effect.

Since the air supplied from the blower 100 is dispersed and moved to the first air passage 210a and the second air passage 225 of the flow path connection portion 200, the load acting on the blower 100 can be reduced have.

The air supplied to the burner salt flask 320 is involved in combustion, but air and gas are supplied so that the air ejected from the air blowing port 370 is not involved in combustion.

In the burner salt flame 320, the mixer is burned at a rate at which complete combustion is performed, so that the burner 300 is composed of a premixed burner. Since the air injected from the air blowing port 370 is mixed with the combustion gas, the combustion gas passing through the heat exchanger 500 has a high excess air ratio and a high dew point temperature The generation of condensed water can be prevented.

In addition, when the first channel connecting member 210 is inserted and coupled into the second channel connecting member 220, a channel through which the gas mixture flows and a channel through which only air flows can be separated, thereby simplifying the channel structure.

Claims

A burner 300 for burning a mixture of the air and the gas and a heat exchanger 500 for heat exchange with water inside by the combustion heat of the burner 300, In the apparatus,

The burner 300 is composed of a central portion located at the center of the burner and a peripheral portion surrounding the central portion;

At the center of the burner 300, the mixer is burned and only the air is blown out at the periphery of the burner;

A first air passage connecting member 210 having a first air passage 210a connected to the center portion and a second air passage 225 connected to the peripheral portion are provided between the burner 300 and the blower 100, And a second flow path connecting member 220 having a gas inlet 223 through which the gas supplied to the first air path 210a flows.
The method according to claim 1,

The first channel connecting member 210 is inserted into and coupled with the inner circumferential surface of the second channel connecting member 220 so as to form a space 220a therebetween, Wherein the gas inlet port (223) communicates with the space (220a) and the first air passage (210a) through a communication hole (214) formed in the first gas passage (214).
3. The method of claim 2,

Wherein the communication hole (214) is made of a venturi structure.
3. The method of claim 2,

The first flow path connecting member 210 includes an air inlet 211 inserted into one end of the second flow path connecting member 220 and an air inlet 211 connected to the end of the air inlet 211, And a passage portion (212) forming a first air passage (210a);

Wherein the communication hole (214) has a gap formed by an upper end portion of the air inlet portion (211) and a lower end portion of the passage portion (212) being displaced.
The method according to claim 3 or 4,

And a depression (215) recessed in the outward direction is formed on the inner surface of the first flow path connecting member (210) adjacent to the communication hole (214).
6. The method of claim 5,

Wherein the passage portion (212) has a shape expanded from the inlet side through which the air passes to the outlet side.
5. The method of claim 4,

A hermetic member for holding the airtightness is interposed between the outer circumferential surface of the air inlet 211 and the inner circumferential surface of the second flow channel connecting member 220,

Wherein a flange (223) formed by an upper end of the second flow path connection member (220) and a fastening member is formed at an air outlet side end of the passage portion (212).
3. The method of claim 2,

The second air passage 225 is formed along the longitudinal direction of the body 222 at the lower end of the body 222 of the second flow passage connecting member 220 and is connected to the periphery of the burner 300, (220a) through which the gas flows.
9. The method of claim 8,

Wherein a plurality of the second air passageways (225) are formed around the first air passageway (210a).
3. The method of claim 2,

The combustion chamber 400 formed between the burner 300 and the heat exchanger 500 is provided with a combustion chamber outer wall 410a and a combustion chamber inner wall 410b formed between the combustion chamber inner walls 410a and 410b and the combustion chamber inner walls 410a and 410b, (420a, 420b);

Wherein a part of the air ejected from the peripheral portion of the burner (300) is ejected to the cooling passage (430), and the remaining air is ejected to the inner side surfaces of the combustion chamber inner walls (410a, 410b).
11. The method of claim 10,

Wherein at least one air outlet 411 is formed in the combustion chamber inner walls 410a and 410b and air blown into the cooling channel 430 flows into the combustion chamber through the air outlet 411. [ Device.
11. The method of claim 10,

The burner 300 includes a burner chamber 320 constituting a burner body and a burner salt flame 320 provided on the burner chamber 320 to generate a flame;

An air connection channel 350 is formed which is a space formed between the burner chamber 320 and the outer walls 420a and 420b to form a flow path so that the air supplied from the blower 100 is blown to the periphery of the burner 300 Being;

Wherein the first air passage (210a) of the first passage connecting member (210) communicates with the mixing space (311) inside the burner chamber (310).