KR102093083B1 - Eco-friendly boiler - Google Patents

Abstract

The present invention relates to an eco-friendly boiler of a novel structure, which is economical due to a reduction in cost for maintenance and management along with a reduction in fuel because its thermal efficiency excellent with various means inducing complete combustion, and is also eco-friendly because the boiler can reduce environment pollution due to a reduction in the production of harmful gas without building a harmful gas disposal facility. The eco-friendly boiler includes: a body (10) including a combustion chamber (A) heated by a burner (60), and a combustion gas outlet (15) formed in the upper part to discharge combustion gas; a preheating chamber (B) formed to surround the combustion chamber (A), and including a plurality of air inlets (22) formed in the lower part to be connected to the outside and a plurality of air outlets (24) formed in the same part to be connected to the combustion chamber (A); a plurality of air blowers (40) connected to the air inlets (22) of the preheating chamber (B) to send the air to the preheating chamber (B); and a hot water pipe (70) installed in the combustion chamber (A). The preheating chamber (B) includes a circumferential bypass induction plate (30) extended in a circumferential direction of the preheating chamber (B) and having an upper part spaced from the upper part of the preheating chamber (B). As a heater (50) is connected to some air blowers (40) of the air blowers (40), the air heated by the heater (50) flows into the combustion chamber (A) via the preheating chamber (B), thus heating the combustion chamber (A).

Description

Eco-friendly boiler

The present invention relates to an eco-friendly boiler, and more particularly, to an eco-friendly boiler having a new configuration that is economical and environmentally friendly because of excellent thermal efficiency by reducing complete combustion of fuel and reducing harmful gas generation.

Boiler body varies in shape and structure depending on the purpose and purpose, but basically has an air inlet and a gas outlet through the combustion chamber, and a burner is provided inside the combustion chamber to heat the combustion chamber, and heat medium such as heating water to the combustion chamber. It is configured to pass through and heat.

However, in such a boiler, when low temperature outside air is supplied to the combustion chamber, heat loss is generated due to a rapid temperature difference, and since the burner must be continuously operated to compensate for the heat loss, fuel consumption increases, and thus thermal efficiency decreases.

In addition, when low-temperature outside air enters the combustion chamber, incomplete combustion of fuel is performed, so thermal efficiency is reduced, and atmospheric conditions such as carbon monoxide (CO), hydrocarbon (HC), and nitrogen oxide (NOx) are reduced due to incomplete combustion of fuel. There is also a problem that a large amount of polluted gas is generated. In addition, if a lot of air pollution gas is generated, the combustion gas of the boiler must be purified and discharged, thereby increasing the cost burden.

Various measures have been proposed to improve the thermal efficiency of the boiler and reduce the emission of air pollutants through the complete combustion of fuel, but as the level required in economical or environmental aspects gradually increases New measures are needed to satisfy these demands.

Republic of Korea Patent Publication No. 10-2004-0083884 (2004. 10. 06.) Republic of Korea Patent Publication No. 10-2012-0110938 (October 10, 2012)

The present invention has been proposed in view of the above problems, and the object of the present invention is to provide a variety of means for inducing complete combustion, which is excellent in thermal efficiency, so that fuel consumption is reduced and maintenance costs are reduced. Since it is reduced, it is possible to reduce environmental pollution without constructing a hazardous gas treatment facility, thereby providing an eco-friendly boiler with a new configuration that is environmentally friendly.

According to a feature of the present invention, the main body 10 having a combustion chamber A heated by a burner 60 and having a combustion gas discharge port 15 through which combustion gas is discharged; A preheating chamber (B) formed to surround the combustion chamber (A) and having a plurality of air inlet holes (22) communicating with the outside and a plurality of air outlet holes (24) communicating with the combustion chamber (A); A plurality of blowers 40 connected to the air inlet holes 22 of the preheating chamber B to blow air to the preheating chamber B; And a hot water pipe 70 provided in the combustion chamber A. The preheating chamber B extends along the circumferential direction of the preheating chamber B, and the upper end is spaced from the upper end of the preheating chamber B. A circumferential bypass induction plate 30 is provided, and a heater 50 is connected to some blowers 40 of the blowers 40, so that the air heated by the heaters 50 is heated in the preheating chamber B. An environment-friendly boiler is provided, characterized in that the combustion chamber (A) is preheated as it flows into the combustion chamber (A).

According to another feature of the invention, the main body 10 having a combustion chamber (A) heated by the burner 60, the combustion gas discharge port 15 through which the combustion gas is discharged; A plurality of unit preheating chambers continuously formed to surround the combustion chamber A, and having an air inlet hole 22 communicating with the outside and an air outlet hole 24A, 24B communicating with the combustion chamber A; A plurality of blowers 40 connected to the air inlet holes 22 of each unit preheating chamber to blow air to each unit preheating chamber; And a hot water pipe 70 provided in the combustion chamber A. In some of the unit preheating chambers, a circumferential bypass extending along the circumferential direction of the unit preheating chamber so that an upper end is spaced from the top of the unit preheating chamber An induction plate 31 is provided, and the remaining unit preheating chamber is in a direction crossing the unit preheating chamber between the air inlet holes 22 and the air outlet holes 24A, 24B so that the upper end is spaced from the top of the unit preheating chamber. A formed lateral bypass induction plate 32 is provided, and a heater 50 is connected to some of the blowers 40 of the blowers 40, so that the air heated by the heaters 50 opens the partial preheating chamber. An eco-friendly boiler is provided, characterized in that the combustion chamber (A) is preheated as it flows into the combustion chamber (A).

According to another feature of the present invention, the burner 60 is provided with two main nozzles that are provided outside of the main nozzle 62 and the main nozzle 62 is injected with fuel mixed with air, for injecting air necessary for combustion. 1, 2 air injection nozzles (64, 65) are formed, the first air injection nozzle (64) is connected to the first air transfer pipe (66) extending so that the end is close to the main nozzle (62), the combustion chamber In (A), an auxiliary air discharge hole 25 communicating with the preheating chamber B is formed, and in the auxiliary air discharge hole 25, a C-shaped pipe part curved at one end to be close to the main nozzle 62 ( 26) is provided, the second air injection nozzle 65 is connected to the second air transfer pipe 67, one end of which is fitted to the other end of the C-shaped pipe portion 26.

According to another feature of the present invention, the air discharge hole (24A) formed in the unit preheating chamber in which the air heated by the heater (50) flows out of each unit preheating chamber is formed in the remaining unit preheating chamber ( 24B) is located on the lower side, the burner 60 is installed so that the tip portion is introduced into the combustion chamber (A), the air discharge hole (24A) formed in the unit preheat chamber into which the air heated by the heater 50 flows in ) It is formed on the upper side.

The present invention having the above configuration is configured such that air is introduced into the combustion chamber (A) via a preheating chamber formed to surround the combustion chamber (A), and the combustion chamber (A) is initially operated by air introduced through the preheating chamber. After being preheated and the combustion chamber A is preheated, the burner 60 is operated to heat the combustion chamber A, and after the combustion chamber A is heated by the burner 60, it is preheated by the heat of the combustion chamber A. As the chamber is heated, the air flowing into the combustion chamber (A) via the preheating chamber is heated, and an organic action is introduced into the combustion chamber (A), whereby complete combustion of fuel is promoted, thermal efficiency is improved, and harmful gas is generated. Is also reduced.

Moreover, the present invention is provided with a bypass induction plate that bypasses the flow of air in the preheating chamber surrounding the combustion chamber (A), whereby the preheating chamber is heated evenly by the bypass induction plate, and the heat insulation of the preheating chamber is also improved.

In addition, the present invention is the relative arrangement position of the air discharge hole 24 and the burner 60 formed to communicate with the combustion chamber A in the preheating chamber, as well as a configuration in which air heated through the preheating chamber flows into the combustion chamber A, Various means to promote the complete combustion of fuel, such as the first and second air transport pipes 66 and 67 connected to the burner 60, are provided to maximize the combustion efficiency of the fuel. Accordingly, the thermal efficiency is excellent and economical. In addition, since the emission of harmful gases is reduced by the complete combustion of fuel, environmental pollution is not caused even if a separate harmful gas treatment device is not installed, and thus has an environmentally friendly advantage.

In addition, when the preheating chamber is divided into a unit preheating chamber, selective blowing is possible for each unit preheating chamber, thereby reducing the risk of the unit preheating chamber being overheated and bursting or causing a fire.

1 is a front sectional view of a first embodiment of the present invention
Figure 2 is a cross-sectional plan view of the embodiment
Figure 3 is an enlarged view of the main portion of the burner used in the above embodiment
4 is a cross-sectional plan view of a second embodiment of the present invention
Figure 5 is a front sectional view of the embodiment

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 3 is a view showing a first embodiment of the present invention, the present invention, as shown, the combustion chamber (A), the combustion chamber (A) surrounding the preheating chamber (B), and the preheating chamber (B) ), A plurality of blowers 40, a heater 50 connected to the blowers 40, a burner 60 for heating the combustion chamber A, and a hot water pipe 70 provided in the combustion chamber A, It includes an auxiliary hot water pipe (80) provided on the hot water pipe (70).

The combustion chamber (A) is formed inside the body (10) formed by a cylindrical outer wall (11), a bottom surface (12) and an upper surface (13) connected to upper and lower ends of the outer wall (11). In this embodiment, the main body 10 is illustrated as having a flat cross-section, but it is natural that the shape of the combustion chamber A is not limited thereto. A non-explanatory reference numeral 15 is a combustion gas discharge port formed on the top of the main body 10 to discharge the combustion gas generated in the combustion chamber (A).

And the preheating chamber (B) is continuously formed to surround the circumference of the combustion chamber (A), it is formed by an inner wall (20) that is installed spaced apart from the outer wall (11) inside the outer wall (11) of the body (10). . This preheating chamber (B) not only functions as an insulating space to insulate the combustion chamber (A), but, as will be described later, as a space for preheating the air supplied to the combustion chamber (A) after the burner 60 is operated. It functions.

Meanwhile, a plurality of air intake holes 22 communicating with the outside and air outlet holes 24 communicating with the combustion chamber A are formed at a predetermined interval at the lower end of the preheating chamber B, and each air intake hole 22 ) Is connected to the blower 40, the air blown by the blower 40 is introduced into the preheating chamber (B) through the air inlet hole 22 and discharged to the combustion chamber (A) through the air outlet hole 24 Airflow is formed. A blower 40 may be connected so as to correspond to each air inlet 22 in a one-to-one manner, but as shown in consideration of economic aspects, one blower is connected to a plurality of air inlet holes 22 It is desirable to do. In this embodiment, eight air inlet holes 22 and eight air outlet holes 24 are formed in the preheating chamber B, and four blowers 40 are provided, so that each blower 40 has two air inlets. (22).

Preferably, the inside of the preheating chamber B is provided with a circumferential bypass induction plate 30 extending along the circumferential direction of the preheating chamber B so that the upper end is spaced apart from the top of the preheating chamber B, and the preheating chamber B ), The air flowing into the circumferential bypass induction plate 30 moves upwards, rides over the circumferential bypass induction plate 30, and then descends again through the air exhaust hole 24 to the combustion chamber A Flow is induced. As the circumferential bypass induction plate 30 is formed in the preheating chamber B as described above, air blown by the blower 40 is bypassed up and down in the preheating chamber B to be discharged, so as described later, the heater 50 When the air heated by is introduced into the preheating chamber (B), the preheating chamber (B) is uniformly heated as a whole, and also, the preheating chamber (B) is divided into inside and outside by a circumferential bypass induction plate (30). The thermal insulation of (B) is also improved.

Meanwhile, a heater 50 is connected to some of the blowers 40 among the blowers 40. Therefore, heated air is introduced into the preheating chamber B by the heater 50, and the combustion chamber A is preheated. As described later, the heater 50 is designed to automatically turn off when the burner 60 of the combustion chamber A operates to reach a predetermined temperature. Therefore, initially, the air supplied to the preheating chamber B is heated by the heater 50 to preheat the combustion chamber A, and after the combustion chamber A is preheated to operate the burner 60, the combustion chamber A As the preheating chamber (B) is heated by heat, the air supplied to the preheating chamber (B) is heated to discharge the combustion chamber (A). Therefore, the present invention is economical because it is not necessary to continuously operate the heater 50 to heat the air injected into the combustion chamber A.

In this embodiment, the heater 50 is illustrated as being formed separately from the blower 40 and connected between the blower 40 and the preheating chamber B, but the blower 40 having an integral heater 50 is used. It is natural that it may. Preferably, as shown, it is possible to connect the heater 50 to all the blowers 40, but it is sufficient to preheat the combustion chamber A to a level required even if the heater 50 is connected only to some blowers 40. Therefore, it is preferable to connect the heater 50 only to some blowers 40 when considering economical aspects.

In addition, a burner 60 is installed in the main body 10, and a burner installation space penetrating the combustion chamber A is formed in the main body 10, and the tip portion of the burner 60 is transferred to the combustion chamber A through the burner installation space. Burner 60 is installed to flow. As shown, the installation angle of the burners 60 is adjusted so that the flames of the burners 60 do not collide with each other, and the burner 60 is installed so as to be positioned above the air exhaust hole 24, so that the air exhaust hole 24 ), The heated air discharged from the burner 60 is smoothly supplied to the tip portion of the burner 60 to help complete combustion of the fuel.

On the other hand, the burner 60, the main nozzle 62 is injected with fuel mixed with air, and is provided on the outside of the main nozzle 62, two first and two air injection nozzles for injecting air necessary for combustion ( 64, 65), the first air injection nozzle (64) is connected to the first air transport pipe (66) that extends so that the end extends close to the main nozzle (62) inside the combustion chamber (A).

 In addition, an auxiliary air discharge hole 25 communicating with the preheating chamber B is formed at a portion proximate to the burner 60 on the inner wall 20, and one end of the auxiliary air discharge hole 25 has a burner 60. C-type pipe portion 26 is curved to be close to the main nozzle 62 of the, the second air injection nozzle 65, the second air transfer pipe is fitted at the other end of the C-type pipe portion 26 ( 67) is connected. Therefore, the air discharged through the second air injection nozzle 65 is mixed with the air in the preheating chamber B discharged from the C-type pipe portion 26 to the auxiliary air discharge hole 25, and one end of the C-type pipe portion 26 It is discharged to the combustion chamber (A), one end of the C-shaped pipe portion 26 is curved close to the main nozzle 62 of the burner 60, so the air discharged through the C-shaped pipe portion 26 is burner 60 It is injected into the main nozzle (62). For reference, in FIG. 1, the first and second air transfer pipes 66 and 67 connected to the burner 60, the auxiliary air discharge hole 25, and the C-shaped pipe portion 26 are omitted to help the understanding of the drawings.

As described above, the air flowing into the first air transfer pipe 66 is heated inside the combustion chamber A and injected to the main nozzle 62 side of the burner 60, and the air flowing into the second air transfer pipe 67 is preheated Since it is mixed with the air heated in the seal (B) and injected to the main nozzle 62 side of the burner 60, complete combustion of fuel is achieved. On the other hand, in the present invention, both liquid fuel, gaseous raw material, and powdered fuel such as pulverized coal can be used. When the temperature of the combustion chamber A is preheated to a predetermined temperature, the burner 60 is designed to automatically ignite.

On the other hand, a hot water pipe 70 is installed inside the combustion chamber A, and water is heated by the combustion heat of the burner 60, which is the same as that of a conventional boiler. And inside the main body 10, an auxiliary hot water pipe 80, which is located above the hot water pipe 70, is further provided, and the auxiliary soft water pipe 80 is heated by waste heat of combustion gas. The auxiliary hot water pipe 80 is connected to the hot water pipe 70 by a connection pipe 82 designed to control the opening from the outside. Therefore, when water needs to be replenished to the hot water pipe 70, the preheated hot water of the auxiliary hot water pipe 80 can be supplied to the hot water pipe 70. If necessary, the hot water from the auxiliary hot water pipe 80 can be discharged to the outside and used separately from the hot water from the hot water pipe 70.

Looking at the operation of the present invention having the above configuration is as follows.

In the present invention, first, by operating the blower 40 to which the heater 50 is connected, the heated air is injected into the preheating chamber B to preheat the combustion chamber A. The heated air introduced into the preheating chamber (B) is uniformly heated up and down because the bypass flow is formed up and down by the circumferential bypass induction plate (30). In this way, when the combustion chamber A is preheated to a preset temperature, the burner 60 is automatically ignited to actively heat the combustion chamber A, and when the combustion chamber A is heated to a preset temperature, the heater 50 Operation is automatically turned off. Preferably, the preheating temperature of the combustion chamber A is set differently according to the type of fuel, for example, 30 ° C when using gaseous fuel (gas), 50-60 ° C using liquid fuel (oil), When using powdered fuel (pulverized coal), the preheating temperature of the combustion chamber A is set to 90 ° C.

On the other hand, when the burner 60 is ignited and the heater 50 is turned off, the blower 40 to which the heater 50 is not connected is also operated. In this case, the preheating chamber B is not only heated to a predetermined temperature. . Since the combustion chamber A is also heated by the burner 60, the air flowing into the preheating chamber B is heated by the heat of the preheating chamber B itself and discharged to the combustion chamber A. In addition, the fuel injected through the main nozzle 62 of the burner 60, as well as the air mixed in the fuel, the air flowing into the combustion chamber (A) through the air discharge hole 24 and the first and second air transfer pipes ( 67) Combustion is promoted by the air introduced through, in particular, since the air introduced through the air discharge holes 24 and the first and second air transport pipes 67 is heated air, complete combustion of fuel is promoted and the boiler is promoted. Heat efficiency is improved, and harmful gas generation is reduced.

As such, as the combustion chamber A is heated, water in the hot water pipe 70 is heated to finally generate hot water. When water in the hot water pipe 70 is insufficient, the auxiliary hot water pipe heated by waste heat of the exhaust gas ( The hot water of 80) is supplied to the hot water pipe 70. In this way, the temperature of the hot water in the hot water pipe 70 is prevented from being excessively lowered, thereby obtaining an energy saving effect.

Hereinafter, another embodiment of the present invention will be described, but description of the same configuration and effect as the above-described embodiment will be omitted.

4 and 5 are a cross-sectional view and a front cross-sectional view according to a second embodiment of the present invention. In this embodiment, as shown, the partition wall 21 is formed at regular intervals in the direction across the preheating chamber, the preheating chamber is divided into a plurality of unit preheating chambers, and the air inlet holes 22 and each unit preheating chamber One air discharge hole 24A, 24B is formed. In this embodiment, it has been exemplified that eight unit preheating chambers are formed, but the number of unit preheating chambers is not particularly limited. Hereinafter, for convenience of description, each unit preheating chamber is referred to as a first unit preheating chamber (B1) to an eighth unit preheating chamber (B8).

And the blower 40 is connected to the air inlet hole 22 of each unit preheating chamber. In this embodiment, four blowers 40 are provided, respectively, the first unit preheating chamber B1 and the third unit preheating chamber. (B3), 2nd unit preheating chamber (B2), 4th unit preheating chamber (B4), 5th unit preheating chamber (B5), 7th unit preheating chamber (B7), 6th unit preheating chamber (B6), and Connected to the 8 unit preheating chamber (B8), and connected to the first unit preheating chamber (B1) and the third unit preheating chamber (B3), and the fifth unit preheating chamber (B5) and the seventh unit preheating chamber (B7). It has been illustrated that the heater 50 is connected to the connected blower 40.

Also in this embodiment, the first, third, fourth, fifth, sixth, and seventh unit preheating chambers B1, B3, B4, B5, B6, and B7 extend in the circumferential direction of each unit preheating chamber. Directional bypass induction plate 31 is installed, the second and eighth unit preheating chamber (B2, B8) has been illustrated as a transverse bypass induction plate 32 extending in the direction across the unit preheating chamber.

In the unit preheating chamber in which the circumferential bypass induction plate 31 is formed, the unit preheating chamber is partitioned in and out by the circumferential bypass induction plate 31 so that the insulation is relatively high compared to the unit preheating chamber in which the lateral bypass induction plate 32 is formed It has a function. On the other hand, the unit preheating chamber in which the lateral bypass induction plate 32 is formed has a slightly lower insulation function than the unit preheating chamber in which the circumferential bypass induction plate 31 is formed, whereby the unit in which the circumferential bypass induction plate 31 is formed. Heat exchange is performed between the preheating chamber and the unit preheating chamber in which the lateral bypass induction plate 32 is formed, so that excessive heating of each unit preheating chamber is prevented, thereby reducing the risk of fire.

As described above, when the preheating chamber is divided into a plurality of unit preheating chambers, selective blowing of the unit preheating chamber can prevent excessive heating of the preheating chamber, although the preheating chamber is divided into a plurality of unit preheating chambers. Heat exchange is performed between each unit preheating chamber, so that each unit preheating chamber is heated evenly and excessive heating is prevented. Preferably, the number of unit preheating chambers in which the circumferential bypass induction plate 31 is formed is formed to be larger than the number of unit preheating chambers in which the lateral bypass induction plate 32 is formed, but the unit in which the lateral bypass induction plate 32 is formed The preheating chamber is configured not to adjoin.

In addition, in this embodiment, the first unit preheating chamber (B1), the third unit preheating chamber (B3), and the fifth unit preheating chamber (B5), which are unit preheating chambers through which the air heated by the heater 50 is introduced in the initial stage of operation, , In the air discharge hole 24A of the seventh unit preheating chamber B7, the heater 50 is not connected, so the second unit preheating chamber B3, which is a unit preheating chamber into which relatively cold air flows, and the fourth unit preheating chamber ( B4), the sixth unit preheating chamber (B6), the eighth unit preheating chamber (B8) is located above the air outlet hole (24B), the burner 60 is these air outlet holes (24A, 24B) The installation height is adjusted so as to be located in between. Therefore, in the initial stage of operation, rapid ignition and complete combustion of the burner 60 are promoted by the heated air flowing through the air discharge hole 24A located under the burner 60, and after the burner 60 ignites Complete combustion of fuel is promoted and combustion efficiency is improved as the heated air is uniformly introduced from above and below the burner 60 through all the air discharge holes 24A and 24B.

Claims (4)

A main body 10 having a combustion chamber A heated by a burner 60 and having a combustion gas discharge port 15 through which combustion gas is discharged;
A preheating chamber (B) formed to surround the combustion chamber (A) and having a plurality of air inlet holes (22) communicating with the outside and a plurality of air outlet holes (24) communicating with the combustion chamber (A);
A plurality of blowers 40 connected to the air inlet holes 22 of the preheating chamber B to blow air to the preheating chamber B; And
Includes; hot water pipe 70 provided in the combustion chamber (A),
The preheating chamber (B) is provided with a circumferential bypass induction plate (30) extending along the circumferential direction of the preheating chamber (B), the upper end being spaced apart from the top of the preheating chamber (B),
A heater 50 is connected to some of the blowers 40 of the blower 40, and as the air heated by the heater 50 flows into the combustion chamber A via the preheating chamber B, the combustion chamber A ) Is preheated,
The burner 60 has two main air injection nozzles 64, which are provided on the outside of the main nozzle 62 and the main nozzle 62, through which fuel mixed with air is injected, for injecting air necessary for combustion. 65) is formed,
The first air injection nozzle 64 is connected to the first air transport pipe 66 extending so that the end is close to the main nozzle 62,
In the combustion chamber (A), an auxiliary air discharge hole (25) communicating with the preheating chamber (B) is formed, and in the auxiliary air discharge hole (25), a C-type curved one end approaches the main nozzle (62) The pipe part 26 is provided,
An eco-friendly boiler, characterized in that a second air transfer pipe (67), one end of which is fitted to the other end of the C-shaped pipe portion (26), is connected to the second air injection nozzle (65).
A main body 10 having a combustion chamber A heated by a burner 60 and having a combustion gas discharge port 15 through which combustion gas is discharged;
A plurality of unit preheating chambers continuously formed to surround the combustion chamber A, and having an air inlet hole 22 communicating with the outside and an air outlet hole 24A, 24B communicating with the combustion chamber A;
A plurality of blowers 40 connected to the air inlet holes 22 of each unit preheating chamber to blow air to each unit preheating chamber; And
Includes; hot water pipe 70 provided in the combustion chamber (A),
A circumferential bypass induction plate 31 extending along the circumferential direction of the unit preheating chamber is provided in some of the unit preheating chambers so that the upper end is spaced from the top of the unit preheating chamber, and the top of the unit preheating chamber has a unit preheating chamber. Between the air inlet hole 22 and the air outlet hole (24A, 24B) so as to be spaced from the upper end of the transverse bypass induction plate 32 formed in a direction crossing the unit preheating chamber is provided,
A heater 50 is connected to some of the blowers 40 of the blowers 40,
An eco-friendly boiler characterized in that the combustion chamber (A) is preheated as the air heated by the heater (50) enters the combustion chamber (A) via the partial unit preheating chamber.
According to claim 2,
The burner 60 has two main air injection nozzles 64, which are provided on the outside of the main nozzle 62 and the main nozzle 62, through which fuel mixed with air is injected, for injecting air necessary for combustion. 65) is formed,
The first air injection nozzle 64 is connected to the first air transport pipe 66 extending so that the end is close to the main nozzle 62,
In the combustion chamber (A), an auxiliary air discharge hole (25) communicating with the preheating chamber is formed, and in the auxiliary air discharge hole (25), a C-shaped pipe part (26) curved at one end to be close to the main nozzle (62) Is equipped,
An eco-friendly boiler, characterized in that a second air transfer pipe (67), one end of which is fitted to the other end of the C-shaped pipe portion (26), is connected to the second air injection nozzle (65).
According to claim 2,
The air discharge hole 24A formed in the unit preheating chamber into which the air heated by the heater 50 flows out of each unit preheating chamber is located below the air discharge hole 24B formed in the remaining unit preheating chamber,
The burner 60 is installed so that the tip portion is introduced into the combustion chamber (A), the air heated by the heater 50 is formed on the upper side than the air discharge hole (24A) formed in the unit preheating chamber is introduced Eco-friendly boiler.

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