KR102478997B1 - Boiler with low-nox burner - Google Patents

Abstract

The present invention relates to a boiler with a low-NO_x burner. The boiler comprises: a boiler body (110) having a heat exchanger (111) in which heat is exchanged according to combustion of fuel supplied to a burner member (130), and an exhaust port (112) installed therein to discharge exhaust gas generated due to combustion of the fuel; the burner member (130) having a burner body (131) for generating heat by burning the supplied fuel, and installed on the heat exchanger (111) to adjust the length of a flame ejected from the burner body (131); a blower (150) installed therein to supply air resulting from combustion of the burner member (130); and a low-temperature air supplier (170) for supplying air, supplied to the burner member (130), at a low temperature of up to -20℃ or less. Therefore, the boiler can mix outdoor air, supplied from the blower, with the low-temperature air from the low-temperature air supplier and supply the mixture, thereby reducing nitrogen oxides caused by the combustion, can supply the air, supplied from the low-temperature air supplier, at up to -20℃, thus reducing the flame temperature of the burner member, thereby reducing generation of nitrogen oxides, and can move a second flame case of a flame ejection control unit of the burner member, thereby reducing generation of nitrogen oxides due to a change in a flame angle.

Description

Boiler with low-nox burner {Boiler with low-nox burner}

The present invention relates to a boiler equipped with a low NOx burner, and more particularly, by supplying air necessary for combustion of fuel at a low temperature, thereby reducing the generation of nitrogen oxides (Nox) generated by combustion of fuel. It relates to a boiler equipped with a burner.

In general, nitrogen oxides (NOx) are fuel NOx, which is produced by oxidation of chemically bonded nitrogen components present in fuel during combustion, and nitrogen molecules in the air for combustion that are released at high temperatures to oxidize nitrogen molecules in the air for combustion. It is divided into Thermal NOx, which is generated by the process, and Prompt NOx, which is rapidly generated when hydrocarbon-based fossil fuel is exposed to a high-temperature area in a high-concentration state.

Among these nitrogen oxides, fuel NOx, in particular, cannot be controlled by combustion technology, and accordingly, the low NOx burner has a technical problem in reducing the generation of two types of nitrogen oxides, thermal NOx and prompt NOx.

This conventional low-NOx burner has a very low oxygen content rate and a relatively lower temperature than the flame temperature, so a device for recovering exhaust gas, which can be called a kind of inert gas, through a supply pipe connected to the flue and mixing it into the flame has been devised. Low NOx type burner of flue gas recirculation method, divided flame burner aimed at increasing radiant heat transfer by dividing the flame to maximize the surface area of the flame, and thin-film flame made into a film to increase the surface area of the flame There is a burner, etc., and such a conventional low NOx burner has been promoted a technique for reducing the generation of thermal NOx by reducing the flame temperature.

However, the low NOx burner of the combustion gas recirculation method needs to increase the volume of the combustion chamber by the amount of exhaust gas introduced from the outside in order to secure sufficient combustion space. Therefore, boiler compaction to reduce the total cost by lowering the boiler manufacturing cost or minimizing the installation space It is leading to results that go against the recent design trend such as design.

이하의 낮은 화염온도 조건에서는 일산화탄소가 이산화탄소로 변환하는 비율이 급격히 떨어져서 일산화탄소 생성이 증가하게 된다.In addition, although the conventional low NOx burner reduces the generation of thermal NOx as the flame temperature is lowered, the carbon in the fuel reacts with the oxygen in the air to primarily generate carbon monoxide, and then reacts with the oxygen in the air again to produce carbon dioxide. 1200 due to the nature of the combustion process in which

In the following low flame temperature conditions, the rate of conversion of carbon monoxide to carbon dioxide is rapidly reduced, resulting in increased production of carbon monoxide.

Such carbon monoxide is a flammable gas, and has a disadvantage in that it poses a risk of explosion in the process of being discharged into the atmosphere through a flue and a chimney.

Accordingly, the conventional low NOx type burner does not actively consider measures for reducing generation of prompt NOx and only considers measures for reducing generation of thermal NOx, thus having a low overall nitrogen oxide (NOx) reduction effect.

For example, Patent Document 1 below discloses a 'boiler configured with an automatic low NOX control system'.

A boiler configured with an auto low NOx control system according to Patent Document 1 includes a fuel pipe for supplying fuel, a burner connected to the fuel pipe to spray flame forward, a blower for supplying air to the burner, and the burner. A heat exchanger equipped with a heat exchanger to receive heat, an exhaust pipe connected to the heat exchanger to discharge exhaust gas, an oxygen sensor mounted in the exhaust pipe to detect the amount of oxygen contained in the exhaust gas, and a blower connected to the oxygen sensor In a boiler including a control unit for controlling, an auto low NOx control system is configured to reduce the amount of NOX in the boiler, and the automatic low NOx control system is installed in the exhaust pipe to reduce NOX (nitrogen) contained in the exhaust gas. oxide) and the control unit 107 configured to control the flame angle (a) of the burner in connection with the Knox sensor and transmitting data by detecting the amount of oxide).

The burner includes a guide pipe connected to the fuel pipe to guide fuel, a cap covered in front of the guide pipe, a discharge pipe connected inwardly from an outer surface of the cap to discharge fuel to the outside, and the cap It includes a rod connected to and extending rearward, a linear actuator connected to the rod and controlled by the control unit, and an air tube accommodating the cap and the rod and fixed to the heat exchanger.

The rear portion of the pipe is configured to be connected to the blower, and includes a plate-shaped cover formed along an outer circumference of the cap and disposed in front of the discharge pipe, and a through hole penetrating the cover, and a front side of the cap. It includes a plate-shaped front cover attached to an end and a through hole penetrating the front cover.

Patent Document 2 below discloses a 'nitrogen oxide reduction type eco-friendly low NOx burner'.

The nitrogen oxide reduction type eco-friendly low NOx burner according to Patent Document 2 below has a tube to which air is supplied and a fuel supply pipe located inside the tube, and a nozzle member is installed in the fuel supply pipe, In a low NOx burner that reduces the generation of pollutants such as nitrogen oxides (NOx) and saves fuel by lowering the flame temperature and oxygen concentration and shortening the residence time of combustion gases, A fuel supply pipe through which fuel is supplied is installed at the inner center of the tube in which the formed air conditioning pipe is extended.

A pilot burner used for fuel ignition is installed at the front end of the fuel supply pipe, and a connecting rod of a nozzle member control lever installed so that a handle is exposed to the rear side of the burner is connected to one side of the connection pipe, and the fuel supply pipe is connected to the other side. There is a slot hole guided by the guide pin formed in the nozzle member, so that the nozzle member is moved forward and backward by the rotational movement of the nozzle member control lever, and the interval between the nozzle member's flame-retaining plate is adjusted with respect to the narrow pipe of the air supply pipe, thereby reducing the external flame of the flame. It is formed to be freely adjustable.

The nozzle member has a disk-shaped nozzle head penetrating the connection pipe, and a plurality of flame jetting nozzles are formed radially at equal intervals on an outer circumferential surface of the nozzle head, and the flame discharged from the flame jetting nozzles is divided. A salt-retaining plate including an air hole for generating split salt and an air hole for preventing central inflammation to suppress the occurrence of central inflammation is formed on the rear side of the nozzle head.

Republic of Korea Patent Registration No. 10-1460775 Republic of Korea Patent Publication No. 10-2013-0106778 Korean Patent Registration No. 10-2243080

An object of the present invention is to solve the above problems, and low NOx burner that can reduce nitrogen oxides generated while burning fuel by supplying the temperature of air supplied to burn fuel at a low temperature. To provide a boiler equipped with.

Another object of the present invention is to provide a boiler equipped with a low NOx burner that is supplied by adjusting the temperature of air supplied to burn fuel to a temperature lower than room temperature.

Another object of the present invention is to provide a boiler equipped with a low NOx burner capable of reducing the generation of nitrogen oxides by adjusting the length, flame width, and flame angle of a flame ejected from a burner installed in the boiler.

In order to achieve the above object, a boiler equipped with a low NOx burner according to the present invention includes a heat exchanger 111 in which heat is exchanged according to the combustion of fuel supplied to the burner member 130, and according to the combustion of the fuel Boiler body 110 equipped with an exhaust port 112 through which the generated exhaust gas is discharged; A burner body 131 generating heat by burning supplied fuel, and a burner member 130 installed in the heat exchanger 111 so as to adjust the length of a flame ejected from the burner body 131; a blower 150 installed to supply air according to the combustion of the burner member 130; A low-temperature air supplier 170 supplying air supplied to the burner member 130 at a low temperature of -20 ° C or less;

The flame of the burner member 130 is characterized in that it is installed to eject in a vertical direction from top to bottom of the heat exchanger 111.

The burner member 130 is a burner body that mixes and burns air supplied from the blower 150, low-temperature air supplied from the low-temperature air supplier 170, and fuel supplied from the fuel supply pipe 132 ( 131); and a flame injection control unit 135 installed on one side of the burner body 131 so as to adjust the injection length of the flame generated by the combustion of the fuel.

The burner body 131 includes a fuel supply pipe 132 through which fuel is supplied for combustion; a first flange 133 formed on one side of the burner body 131 so that the burner body 131 can be installed in the heat exchanger 111; and a second flange 134 formed on the other side of the burner body 131 so that air and low-temperature cold air can be mixed and introduced from the blower 150 and the low-temperature air supplier 170. .

The flame injection control unit 135 includes a first flame case 136 fixed to the first flange 133; a sliding hole 137 formed in the first flame case 136; A second flame case 138 slidably coupled to the outer surface of the first flame case 136; A flame nozzle 139 installed on one side of the first flame case 136; A moving rod unit 141 installed inside the first flame case 136 to move the second flame case 138; includes,

The moving rod unit 141 includes a pair of first fixed rods 142 formed to a predetermined length; Case fixing rod 143 fixed to both sides of the pair of first fixing rods 142, fixed to the inner surface of the second flame case 138, and movably installed along the sliding hole 137 ); a second fixing rod 144 fixed between the pair of first fixing rods 142; A third fixing rod 145 fixed to the second fixing rod 144; characterized in that it includes.

A fuel gas circulation line 113 is installed in the boiler body 110 so that fuel gas ejected from the heat exchanger 111 can flow into the burner member 130, and discharged through the exhaust port 112. A bypass line 114 is installed between the exhaust port 112 and the low-temperature air supplier 150 so that exhaust gas can be re-introduced into the burner member 130, and the fuel gas circulation line 113 It is characterized in that a cooler 171 for cooling the temperature of the gas and the exhaust gas of the bypass line 114 is installed.

As described above, according to the boiler equipped with a low-NOx burner according to the present invention, by supplying a mixture of outdoor air supplied from the blower and low-temperature air from the low-temperature air supplier, nitrogen oxides due to combustion can be reduced, and low-temperature air The flame temperature of the burner member can be lowered by supplying the air supplied from the supplier at a maximum of ~20 ° C, thereby reducing the generation of nitrogen oxides, and by moving the second flame case of the flame injection control unit of the burner member. The effect of reducing the generation of nitrogen oxides is obtained due to the change in the flame angle.

According to the boiler equipped with a low-NOX burner according to the present invention, by lowering the flame temperature by supplying low-temperature air from the low-temperature air supplier, nitrogen oxides can be lowered by approximately 4 to 6 ppm, and by sliding the flame case of the burner member, It is possible to lower nitrogen oxides by approximately 3 to 4 ppm, and the effect of lowering nitrogen oxides by approximately 2 to 3 ppm is obtained by the fuel gas circulation line.

1 is a configuration diagram showing a boiler equipped with a low NOx burner according to a preferred embodiment of the present invention;
2 is a three-dimensional view showing a low NOx combustion burner according to a preferred embodiment of the present invention;
3 is a configuration diagram showing a low NOx combustion burner according to a preferred embodiment of the present invention;
4 is an exploded three-dimensional view showing a low NOx combustion burner according to a preferred embodiment of the present invention;
5 is a three-dimensional view showing a low NOx combustion burner according to a preferred embodiment of the present invention;
Figure 6 is a cross-sectional view showing the flame angle ejected from the low NOX combustion burner according to a preferred embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily carry out the present invention.

However, since the description of the present invention is only an embodiment for structural or functional description, the scope of the present invention should not be construed as being limited by the embodiments described in the text.

For example, since the embodiments can be changed and have various forms, it should be understood that the scope of the present invention includes equivalents capable of realizing the technical idea.

In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only such effects, the scope of the present invention should not be construed as being limited thereto.

In this specification, this embodiment is provided to complete the disclosure of the present invention and to completely inform those skilled in the art of the scope of the invention to which the present invention belongs. And the invention is only defined by the scope of the claims.

Thus, in some embodiments, well-known components, well-known operations and well-known techniques have not been described in detail in order to avoid obscuring the interpretation of the present invention.

On the other hand, the meaning of the terms described in the present invention is not limited to the dictionary meaning, and should be understood as follows.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs, unless defined otherwise.

Terms defined in commonly used dictionaries should be interpreted as consistent with meanings in the context of related art, and cannot be interpreted as having ideal or excessively formal meanings unless explicitly defined in the present invention.

Hereinafter, a boiler equipped with a low NOx burner according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

A boiler equipped with a low NOx burner according to a preferred embodiment of the present invention has a heat exchanger 111 in which heat is exchanged according to the combustion of fuel supplied to the burner member 130, and exhaust gas generated according to the combustion of the fuel is discharged. A boiler body 110 equipped with an exhaust port 112 installed to be installed, a burner body 131 generating heat by burning supplied fuel, and the length of the flame ejected from the burner body 131 can be adjusted. The burner member 130 installed in the heat exchanger 111, the blower 150 installed to supply air according to the combustion of the burner member 130, and the air supplied to the burner member 130 It includes a low-temperature air supplier 170 supplying low-temperature air below -20 ° C.

1 is a configuration diagram showing a boiler equipped with a low NOx burner according to a preferred embodiment of the present invention.

As shown in FIG. 1, the boiler with a low NOx burner according to an embodiment of the present invention includes a boiler body 110 equipped with a heat exchanger 111 and an exhaust port 112, and the boiler body so that combustion is made. A burner member 130 installed at 110, a blower 150 for supplying air for combustion, and low-temperature air mixed with the air supplied from the blower 150 to supply low-temperature air It consists of a feeder (170).

The boiler body 110 is provided with a heat exchanger 111 to exchange heat from the heat source of the burner member 130 in which fuel is burned, and exhaust gas generated by the combustion of fuel is provided in the boiler body 110. An exhaust outlet 112 is installed.

In addition, a fuel gas circulation line 113 for circulating and supplying unburned fuel gas among fuel gases to the burner member 130 is installed in the boiler body 110 .

In addition, a bypass line 114 is installed in the exhaust port 112 so that some of the exhaust gas can be supplied to the low-temperature air supplier 170 .

Figure 2 is a three-dimensional view showing a low NOx combustion burner according to a preferred embodiment of the present invention, Figure 3 is a configuration diagram showing a low NOx combustion burner according to a preferred embodiment of the present invention, Figure 4 is a block diagram of the present invention It is an exploded three-dimensional view showing a low NOx combustion burner according to a preferred embodiment, and FIG. 5 is a three-dimensional view showing a low NOx combustion burner according to a preferred embodiment of the present invention.

3 shows the burner member 130, FIG. 3 (a) shows a state in which the first flame case 136 and the second flame case 138 are located at the same position, FIG. 3 (b) ) shows a state in which the second flame case 138 is slid to the outside of the first flame case 136.

The burner member 130 is a burner body that mixes and burns air supplied from the blower 150, low-temperature air supplied from the low-temperature air supplier 170, and fuel supplied from the fuel supply pipe 132 ( 131) and a flame injection control unit 135 installed on one side of the burner body 131 to adjust the injection length of the flame generated by the combustion of the fuel.

The burner body 131 is formed on one side of the burner body 131 so that the fuel supply pipe 132 through which fuel is supplied for combustion and the burner body 131 can be installed in the heat exchanger 111. a first flange 133, and a second flange 134 formed on the other side of the burner body 131 so that air and low-temperature cold air can be mixed and introduced from the blower 150 and the low-temperature air supplier 170. ) is provided.

As shown in FIGS. 2 to 5 , the burner member 130 burns fuel, and the burner body 131 is provided with a fuel supply pipe 132 for supplying gas fuel.

In addition, a first flange 133 is installed on one side of the burner body 131 to be installed on the boiler body 110, and a blower 150 and a low-temperature air supplier 170 are installed on the other side of the burner body 131. A second flange 134 is installed so that the lamp can be installed.

The flame injection control unit 135 controls the flame length, flame width and flame angle ejected through the flame injection hole 139, and the flame injection control unit 135 is a first flame case 136 formed in a cylindrical shape. And, it consists of a second flame case 138 and a moving rod unit 141.

The first flame case 136 is formed as a hollow cylindrical body having a certain length, and the first flame case 136 has a sliding hole 137 having a certain length so that the moving rod unit 141 can slide. is formed

In addition, the second flame case 138 is movably installed on the outer surface of the first flame case 136, and the second flame case 138 has a first flame length, flame width and flame angle to be adjustable. It is installed to be movable in the longitudinal direction of the flame case 136.

In addition, a flame nozzle 139 is installed at the front end of the first flame case 136 so that the flame can be evenly ejected, and a plurality of notches 139a and a flame ejection hole 139b radially are installed in the flame nozzle 139. is formed

The flame injection control unit 135 includes a first flame case 136 fixed to the first flange 133, a sliding hole 137 formed in the first flame case 136, and the first flame A second flame case 138 slidably coupled to the outer surface of the case 136, a flame nozzle 139 installed on one side of the first flame case 136, and the second flame case 138 It includes a moving rod unit 141 installed inside the first flame case 136 to move.

The moving rod unit 141 is fixed to both sides of a pair of first fixed rods 142 formed to a predetermined length and the pair of first fixed rods 142, respectively, and the second flame case ( 138) and a case fixing rod 143 movably installed along the sliding hole 137 and a second fixing rod 144 fixed between the pair of first fixing rods 142 ) and a third fixing rod 145 fixed to the second fixing rod 144.

The movable rod unit 141 moves the second flame case 138, and the first fixed rod 141 of the movable rod unit 141 is formed as a pair and has a predetermined length.

A case fixing rod 143 fixed to the inner surface of the second flame case 138 is fixed to one surface of the first fixing rod 141 . One end of the case fixing rod 143 is fixed to the first fixing rod 142, and the other end of the case fixing rod 143 is fixed to the second flame case 138.

A second fixing rod 144 is fixed between the pair of first fixing rods 142, and a third fixing rod 145 having a predetermined length is fixed to the second fixing rod 144.

The third fixed rod 145 is installed connected to a driving means (not shown) to move the movable rod unit 141 .

6 is a cross-sectional view showing a flame angle ejected from a low NOx combustion burner according to a preferred embodiment of the present invention.

6 shows flame angles a1 and b1 ejected from the burner member 130, and FIG. 6 (a) shows a state in which the first flame case 136 and the second flame case 138 are at the same position. 6 (b) shows a state in which the second flame case 138 protrudes to the outside of the first flame case 136.

That is, Figure 6 (a) shows the flame angle (a1) ejected in the state where the first flame case 136 and the second flame case 138 are installed in the same position, Figure 6 (b) shows the second flame case 138 It shows the flame angle (b1) ejected in the state where the flame case 138 moves from the first flame case 136 and protrudes.

The flame angle (a1) of FIG. 6 (a) is wider than the flame angle (b1) of FIG. 6 (b) because the ends of the first flame case 136 and the second flame case 138 are at the same position. .

Since the flame angle b1 of FIG. 6 (b) is a state in which the second flame case 138 is moved to the outside of the first flame case 136 and protrudes, the flame angle b1 of FIG. 6 (b) is The flame angle a1 is not only narrowly ejected but also ejected long from the burner member 130 .

On the other hand, the burner member 130 is provided with a blower 150 to supply fuel supplied through the fuel supply pipe 132 and air necessary for combustion, and to lower the temperature of the air supplied to the blower 150 at a low temperature. An air supplier 170 is provided.

The low-temperature air supplier 170 supplies air having a temperature lower than that of the air supplied from the blower 150.

The low-temperature air supplier 170 not only supplies low-temperature air of up to -20°C or lower, but also lowers the temperature of the fuel gas and exhaust gas moving through the fuel gas circulation line 113 and the bypass line 114 to a low temperature. .

In addition, the low-temperature air supplier 170 may be provided with a cooler 171 that lowers the temperature of the fuel gas and exhaust gas moving through the fuel gas circulation line 113 and the bypass line 114 .

Next, a method of operating a boiler equipped with a low NOx burner according to a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 6.

As shown in FIGS. 1 to 6, in the boiler equipped with a low NOx burner according to an embodiment of the present invention, fuel is supplied to the burner member 130 through the fuel supply pipe 132, and the blower 150 Air at room temperature is supplied from and low-temperature air is introduced from the low-temperature air supplier 170 .

The blower 150 supplies room temperature air, and the low temperature air supplier 170 supplies low temperature air at a maximum of -20°C.

Accordingly, the air supplied from the blower 150 and the air supplied from the low-temperature air supplier 170 are supplied to the burner member 130 in a mixed state.

This supplies low-temperature air to the burner member 130, thereby reducing nitrogen oxides (Nox) generated during combustion.

That is, by lowering the temperature of the air supplied to the burner member 130, the generation of nitrogen oxides is reduced.

In this way, the flame temperature according to the temperature of the air supplied to the burner member 130 and the generation amount of nitrogen oxides (Nox) can be calculated by the following equation.

<Equation 1>

The amount of nitrogen oxides generated according to the above formula can grasp the exponential increase relationship of temperature, and when the outside air temperature increases by 50 ° C. The flame temperature in the inside is also increased by about 50 ° C.

For example, if the flame temperature is 1,600°C when the outdoor air temperature supplied to the burner member 130 is 40°C, the flame temperature may be about 1,580°C when the outdoor air temperature supplied to the burner member 130 is 20°C. .

When it is measured that 40 ppm of nitrogen oxides (NOx1) in the exhaust gas is generated when the outside air temperature is 40 ° C (T1) in the boiler body 110, when the outside air temperature is lowered by about 35 ° C to 5 ° C (T2) , when the generated nitrogen oxide (NOx) is predicted in Equation 1, it is as follows.

Substituting these temperatures into Equation 1, NOx2 = NOx1 * exp(8.28*10 ^-3 )(T2-T1) = 40 * exp(8.28*10 ^-3 )(40-5) = 29.9.

That is, when the outside air temperature supplied to the burner member 130 is lowered to 5° C., 29.9 ppm of nitrogen oxides generated in the boiler body 110 is generated.

Looking at this corresponding to each temperature, the following [Table 1] is shown.

outside temperature predicted NOx note 5℃ 29.9 NOx calculated by Equation 1 10℃ 31.2 NOx calculated by Equation 1 15℃ 32.5 NOx calculated by Equation 1 20℃ 33.9 NOx calculated by Equation 1 25℃ 35.3 NOx calculated by Equation 1 30℃ 36.8 NOx calculated by Equation 1 35℃ 38.4 NOx calculated by Equation 1 40℃ 40.0 Measured NOx

In this way, when the supply air temperature supplied to the burner member 130 is lowered, nitrogen oxides generated by combustion of fuel can be significantly reduced.

That is, low-temperature air of up to -20° C. is supplied from the low-temperature air supplier 170, and room-temperature air is mixed and supplied to the burner member 130 from the blower 150.

In this way, by supplying low-temperature air from the low-temperature air supplier 170, nitrogen oxides resulting from combustion can be lowered by approximately 4 to 6 ppm, and the second flame case 138 of the flame injection control unit 135 is set to the first As the length of the flame is increased by moving to the outside of the flame case 136, nitrogen oxides can be lowered by approximately 3 to 4 ppm.

In addition, as the fuel gas is recirculated through the fuel gas circulation line 113, nitrogen oxides can be reduced by approximately 2 to 3 ppm.

In this way, as the temperature of the air supplied to the burner member 130 is lowered, generation of nitrogen oxides (NOx) can be reduced by approximately 10 to 15 ppm.

Although the invention made by the present inventors has been specifically described according to the above embodiments, the present invention is not limited to the above embodiments and can be changed in various ways without departing from the gist of the invention.

110: boiler body 111: heat exchanger
112: exhaust port 113: fuel gas circulation line
114: bypass line
130: burner member 131: burner body
132: fuel supply pipe 133: first flange
134: second flange 135: flame spray control unit
136: first flame case 137: sliding hole
138: second flame case 139: flame nozzle
141: moving rod unit 142: first fixed rod
143: case fixing rod 144: second fixing rod
145: third fixed rod
150: blower
170: low-temperature air supply 171: cooler

Claims (5)

A boiler body 110 equipped with a heat exchanger 111 in which heat is exchanged according to the combustion of fuel supplied to the burner member 130 and an exhaust port 112 through which exhaust gas generated according to the combustion of the fuel is discharged; A burner body 131 generating heat by burning supplied fuel, and a burner member 130 installed in the heat exchanger 111 so as to adjust the length of a flame ejected from the burner body 131; a blower 150 installed to supply air according to the combustion of the burner member 130; And a low-temperature air supplier 170 for supplying air supplied to the burner member 130 at a low temperature of up to -20 ° C or less,
The burner member 130 is a burner body that mixes and burns air supplied from the blower 150, low-temperature air supplied from the low-temperature air supplier 170, and fuel supplied from the fuel supply pipe 132 ( 131); And a flame injection control unit 135 installed on one side of the burner body 131 to adjust the injection length, flame width and flame angle of the flame generated by the combustion of the fuel,
The burner body 131 includes a fuel supply pipe 132 through which fuel is supplied for combustion; a first flange 133 formed on one side of the burner body 131 so that the burner body 131 can be installed in the heat exchanger 111; And a second flange 134 formed on the other side of the burner body 131 so that air and low-temperature cold air can be mixed and introduced from the blower 150 and the low-temperature air supplier 170,
The flame injection control unit 135 includes a first flame case 136 fixed to the first flange 133; a sliding hole 137 formed in the first flame case 136; A second flame case 138 slidably coupled to the outer surface of the first flame case 136; A flame nozzle 139 installed on one side of the first flame case 136; Including a moving rod unit 141 installed inside the first flame case 136 to move the second flame case 138,
The moving rod unit 141 includes a pair of first fixed rods 142 formed to a predetermined length; Case fixing rod 143 fixed to both sides of the pair of first fixing rods 142, fixed to the inner surface of the second flame case 138, and movably installed along the sliding hole 137 ); a second fixing rod 144 fixed between the pair of first fixing rods 142; And a third fixing rod 145 fixed to the second fixing rod 144,
The flame of the burner member 130 is installed to be ejected in a vertical direction from top to bottom of the heat exchanger 111,
A boiler equipped with a low NOx burner, characterized in that a plurality of notches 139a and flame ejection holes 139b are formed radially in the flame ejection hole 139.
delete delete delete According to claim 1,
A fuel gas circulation line 113 is installed in the boiler body 110 so that the fuel gas ejected from the heat exchanger 111 can flow into the burner member 130,
A bypass line 114 is installed between the exhaust port 112 and the low-temperature air supplier 150 so that the exhaust gas discharged through the exhaust port 112 can be re-introduced into the burner member 130,
A boiler with a low NOx burner, characterized in that a cooler (171) is installed to cool the temperature of the fuel gas of the fuel gas circulation line (113) and the exhaust gas of the bypass line (114).

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