TWI862242B - Whirlwind device and burner - Google Patents

Abstract

A whirlwind device and a burner including the whirlwind device are described. The whirlwind device includes an end plate. The end plate is configured to be disposed on a front end of the burner. The end plate includes a first surface and a second surface, which are opposite to each other. The end plate has a spray hole and plural swirl holes. The spray hole is located in a center of the end plate. When the end plate is disposed on the front end of the burner, the spray hole is opposite to a first nozzle of the burner. The swirl holes are spaced apart from each other, and disposed through the end plate and surround the spray hole. The swirl holes extend obliquely from the first surface of the end plate to the second surface.

Description

Cyclone device and burner

This disclosure relates to a heating technology, and more particularly to a cyclone device and a burner.

The flame generated by the direct-fire heating method of the industrial furnace may hit the workpiece placed in the industrial furnace, causing the workpiece to have concentrated thermal stress and uneven crystal phase, resulting in poor workpiece quality. In order to prevent the flame from directly hitting the workpiece, it is usually necessary to reduce the number of workpieces placed in the industrial furnace, which leads to reduced production output and lower production efficiency.

Therefore, one of the purposes of the present disclosure is to provide a cyclone device and a burner including the cyclone device. The cyclone device includes an end plate disposed at the front end of the burner, wherein the end plate is provided with a nozzle and a plurality of cyclone holes surrounding the nozzle. These cyclone holes are obliquely penetrated in the end plate, and can shorten the length of the burner flame and increase the width of the flame, thereby reducing the aspect ratio of the flame and increasing the swirl number. In this way, the flame can be prevented from directly contacting the workpiece, thereby avoiding local high temperature of the workpiece, reducing the black skin on the surface of the workpiece, and thereby improving the quality of the workpiece and the product yield.

Another purpose of the present disclosure is to provide a cyclone device and a burner, which can shorten the flame length of the burner, so that more workpieces can be placed in the heating furnace, thereby improving production capacity.

According to the above-mentioned purpose of the present disclosure, a vortex device is proposed. The vortex device includes an end plate. The end plate is configured to be installed at the front end of the burner. The end plate includes a first surface and a second surface opposite to each other. The end plate has a nozzle and a plurality of vortex holes. The nozzle is penetrated through the center of the end plate. When the end plate is disposed at the front end of the burner, the nozzle is opposite to the first nozzle of the burner. The vortex holes are penetrated through the end plate at intervals and surround the nozzle. These vortex holes extend obliquely from the first surface of the end plate to the second surface.

According to one embodiment of the present disclosure, there is an angle between the central axis of each vortex hole and the normal of the second surface, and the angle is 15 degrees to 60 degrees.

According to one embodiment of the present disclosure, the above-mentioned nozzle has a second nozzle located in the second surface, and each vortex hole has a third nozzle located in the second surface, and the total area of these third nozzles is equal to or greater than the area of the second nozzle.

According to one embodiment of the present disclosure, the shape of the third nozzle is rectangular, square, circular, or elliptical.

According to one embodiment of the present disclosure, the thickness of the above-mentioned end plate is 10mm to 20mm.

According to one embodiment of the present disclosure, the above-mentioned cyclone device further includes a connecting portion. The connecting portion is arranged around the periphery of the first surface of the end plate and protrudes in a direction away from the second surface.

According to the above-mentioned purpose of the present disclosure, a burner is also proposed. This burner includes a first air intake pipe, a combustion chamber, a second air intake pipe, an igniter, and a vortex device. The first air intake pipe has a first air intake passage. The first air intake passage has a first air inlet and a first air outlet. The combustion chamber is arranged in the first air intake passage and is adjacent to the first air outlet. The combustion chamber has a first nozzle. The second air intake pipe is arranged in the first air intake pipe and has a second air intake passage. The second air intake passage has a second air inlet and a second air outlet, and the second air outlet is arranged on the combustion chamber and connected to the combustion chamber fluid. The igniter is arranged in the first air intake passage and penetrates into the combustion chamber. The vortex device includes an end plate. The end plate is arranged at the front end of the burner and covers the first air outlet. The end plate includes a first surface and a second surface opposite to each other. The end plate has a nozzle and a plurality of vortex holes. The nozzle is disposed in the center of the end plate, wherein the nozzle is opposite to the first nozzle. The vortex holes are disposed in the end plate at intervals and surround the nozzle. These vortex holes extend obliquely from the first surface of the end plate to the second surface.

According to one embodiment of the present disclosure, there is an angle between the central axis of each vortex hole and the normal of the second surface, and the angle is 15 degrees to 60 degrees.

According to one embodiment of the present disclosure, the above-mentioned nozzle has a second nozzle located in the second surface, and each vortex hole has a third nozzle located in the second surface. The total area of these third nozzles is equal to or greater than the area of the second nozzle.

According to an embodiment of the present disclosure, the above-mentioned cyclone device further includes a connecting portion. The connecting portion is arranged around the periphery of the first surface of the end plate and protrudes in a direction away from the second surface. The connecting portion is connected to the first air outlet of the first air inlet pipe.

100: Burner

102:Front End

112: First air intake channel

112a: First air inlet

112b: First air outlet

114: Inner side

110: First air intake pipe

120: Combustion chamber

122: First nozzle

130: Second air intake pipe

132: Second air intake channel

132a: Second air inlet

132b: Second air outlet

140: Ignition

142: Ignition end

150: Cyclone device

152: End plate

152a: first surface

152b: Second surface

152s: Blowhole

152s’: Second nozzle

152w: vortex hole

152w’: The third nozzle

152w”: Center axis

154:Connection part

A: Air

FG: Gas

FL: Flame

t: thickness

θ: angle of inclination

The following detailed description in conjunction with the accompanying drawings will provide a better understanding of the present disclosure. It should be noted that, in accordance with standard industry practice, the features are not drawn to scale. In fact, the dimensions of the features may be increased or decreased arbitrarily to facilitate discussion.

[Figure 1] is a schematic diagram of a burner device according to one embodiment of the present disclosure.

[Figure 2] is a partial three-dimensional schematic diagram of a burner according to one embodiment of the present disclosure.

[Figure 3A] to [Figure 3D] are schematic diagrams showing vortex holes at four different angles of a vortex device according to one embodiment of the present disclosure.

[Figure 4] is a curve diagram showing the swirl hole angle and flow rate ratio of a burner equipped with a swirl device of Figures 3A to 3D according to one embodiment of the present disclosure.

[Figure 5] is a curve diagram showing the swirl hole angle and swirl number of a burner equipped with a swirl device of Figures 3A to 3D according to one embodiment of the present disclosure.

[Figure 6] is a curve diagram showing the angle of the swirl hole and the length and width of the flame of a burner equipped with the swirl device of Figures 3A to 3D according to one embodiment of the present disclosure.

[Figure 7] is a curve diagram showing the swirl hole angle and the flame aspect ratio of a burner equipped with a swirl device of Figures 3A to 3D according to one embodiment of the present disclosure.

The following is a detailed discussion of the embodiments of the present disclosure. However, it is understood that the embodiments provide many applicable concepts that can be implemented in a variety of specific contexts. The embodiments discussed and disclosed are for illustration only and are not intended to limit the scope of the present disclosure. All embodiments of the present disclosure disclose a variety of different features, but these features can be implemented separately or in combination as needed.

In addition, the terms "first", "second", etc. used in this article do not specifically refer to order or sequence, but are only used to distinguish between components or operations described by the same technical terms.

The spatial relationship between two elements described in this disclosure is applicable not only to the orientation shown in the diagram, but also to the orientation not shown in the diagram, such as the inverted orientation. In addition, the "connection", "electrical connection" or similar terms between two components in this disclosure are not limited to direct connection or electrical connection between the two, but may also include indirect connection or electrical connection as required.

Please refer to FIG. 1 and FIG. 2, which respectively show a schematic diagram and a partial three-dimensional schematic diagram of a burner 100 according to an embodiment of the present disclosure. The burner 100 is a direct-fire burner that can be used to heat, dissolve, sinter, and heat-treat a workpiece. The burner 100 mainly includes a first air intake pipe 110, a combustion chamber 120, a second air intake pipe 130, an igniter 140, and a cyclone device 150.

The first air intake pipe 110 is a hollow tubular structure. The first air intake pipe 110 has a first air intake channel 112. The first air intake channel 112 has a first air intake port 112a and a first air outlet port 112b. The first air intake port 112a and the first air outlet port 112b can be located at opposite sides of the first air intake channel 112. The combustion-supporting air A can flow into the first air intake channel 112 from the first air intake port 112a and flow out of the first air intake channel 112 from the first air outlet port 112b. The first air intake pipe 110 can be, for example, a round tube. However, the first air intake pipe 110 can also be a pipe of other shapes, which is not limited to the present disclosure. The material of the first air intake pipe 110 can be metal.

The combustion chamber 120 is disposed in the first air intake passage 112 and adjacent to the first air outlet 112b of the first air intake passage 112. The combustion chamber 120 is fluidly connected to the first air intake passage 112. The radial dimension of the combustion chamber 120 is smaller than the radial dimension of the first air intake passage 112, and the combustion chamber 120 is separated from the inner side surface 114 of the first air intake pipe 110, so that the air A can flow to the first air outlet 112b through the combustion chamber 120 and the inner side surface 114 of the first air intake pipe 110. The combustion chamber 120 has a first nozzle 122. The air A and the fuel gas FG can flow into the combustion chamber 120 and ignite in the combustion chamber 120 to generate a flame FL. The flame FL can be ejected out of the combustion chamber 120 through the first nozzle 122.

The second air intake pipe 130 is disposed in the first air intake passage 112 of the first air intake pipe 110. The second air intake pipe 130 may be, for example, substantially parallel to the first air intake pipe 110. In some embodiments, the central axis of the second air intake pipe 130 overlaps the central axis of the first air intake pipe 110. The second air intake pipe 130 has a second air intake passage 132. The second air intake passage 132 has a second air intake port 132a and a second air outlet port 132b. The second air intake port 132a and the second air outlet port 132b may be located at opposite sides of the second air intake passage 132, respectively, wherein the second air outlet port 132b is disposed on the combustion chamber 120 and is fluidically connected to the combustion chamber 120. The fuel gas FG can flow into the second air intake channel 132 from the second air intake port 132a, and then flow into the combustion chamber 120 from the second air intake channel 132 through the second air outlet port 132b. The second air intake pipe 130 can be a round tube. However, the second air intake pipe 130 can also be a pipe of other shapes, which is not limited to this disclosure. The material of the second air intake pipe 130 can also be metal.

The igniter 140 is disposed in the first air inlet passage 112 and penetrates into the combustion chamber 120. The igniter 140 has an ignition end 142, wherein the ignition end 142 is located in the combustion chamber 120. The ignition end 142 can ignite the fuel gas FG and the air A entering the combustion chamber 120 to generate a flame FL.

The vortex device 150 may be disposed at the front end 102 of the burner 100 to change the shape of the flame FL ejected from the first nozzle 122, thereby adjusting the aspect ratio of the flame FL. The vortex device 150 may mainly include an end plate 152, wherein the end plate 152 is disposed at the front end 102 of the burner 100 and covers the first air outlet 112b. The end plate 152 includes a first surface 152a and a second surface 152b opposite to each other, wherein the first surface 152a faces the first nozzle 122. In some embodiments, the thickness t of the end plate 152 is about 10 mm to about 20 mm.

The end plate 152 can be directly connected to the first air outlet 112b of the first air inlet passage 112 of the first air inlet pipe 110 by, for example, welding. In some embodiments, the cyclone device 150 further includes a connecting portion 154. The connecting portion 154 is arranged around the periphery of the first surface 152a of the end plate 152, and protrudes in a direction away from the second surface 152b. Specifically, the connecting portion 154 can be a hollow tubular structure, and the shape of the connecting portion 154 can be the same as that of the end plate 152. The connecting portion 154 is connected to the first air outlet 112b of the first air inlet passage 112 of the first air inlet pipe 110, that is, the connecting portion 154 is connected between the end plate 152 and the first air inlet pipe 110.

As shown in FIG. 1 and FIG. 2 , the end plate 152 has a nozzle 152s and a plurality of swirl holes 152w. The nozzle 152s may be disposed in the center of the end plate 152. The nozzle 152s may extend substantially vertically from the first surface 152a of the end plate 152 to the second surface 152b. In some embodiments, when the end plate 152 is disposed at the front end 102 of the burner 100, the nozzle 152s is opposite to the first nozzle 122 of the combustion chamber 120. In this way, the flame FL ejected from the first nozzle 122 may further pass through the nozzle 152s and eject the burner 100. For example, the size of the nozzle 152s may be equal to or greater than the size of the first nozzle 122. In an embodiment where the size of the nozzle 152s is equal to the size of the first nozzle 122, the nozzle 152s can be aligned with the first nozzle 122, that is, completely overlapped with each other. Thereby, the flame FL ejected from the first nozzle 122 can be ejected smoothly through the nozzle 152s. There may be a distance between the nozzle 152s and the first nozzle 122, or there may be no distance. The shape of the nozzle 152s may be, for example, circular. However, the nozzle 152s may also have other shapes, such as elliptical, which is not limited to the present disclosure. The nozzle 152s has a second nozzle 152s' located in the second surface 152b of the end plate 152.

As shown in FIG. 2 , vortex holes 152w are interspaced and penetrated in the end plate 152, and these vortex holes 152w surround the outside of the jet hole 152s. In some exemplary embodiments, these vortex holes 152w are evenly distributed outside the jet hole 152s. The number of vortex holes 152w is more than 2. For example, the number of vortex holes 152w can be 2 to 6. In some exemplary embodiments, the number of vortex holes 152w is 4 to 6. Each vortex hole 152w extends obliquely from the first surface 152a of the end plate 152 to the second surface 152b, so each vortex hole 152w has a third jet 152w' located in the second surface 152b. For example, the shape of the third nozzle 152w' can be rectangular, square, circular, or elliptical. The third nozzle 152w' can be formed into a suitable shape according to the processing requirements.

In some embodiments, the total area of the third nozzle 152w' of these swirl holes 152w is equal to or greater than the area of the second nozzle 152s' of the nozzle 152s, so that the swirl hole 152w can generate enough swirl to rotate the flame FL ejected from the nozzle 152s, and effectively change the aspect ratio of the flame FL. In some exemplary embodiments, the total area of the third nozzle 152w' is equal to the area of the second nozzle 152s'.

These vortex holes 152w are inclined in the same direction. In some exemplary embodiments, the inclination angles of these vortex holes 152w are the same. However, in some specific embodiments, the inclination angles of these vortex holes 152w may be different. Please refer to Figures 3A to 3D, which are schematic diagrams of vortex holes 152w at four different angles of a vortex device 150 according to one embodiment of the present disclosure. Each vortex hole 152w has a central axis 152w", and there is an angle θ between the central axis 152w" and the normal NL of the second surface 152b of the end plate 152. In some embodiments, the angle θ is about 15 degrees to about 60 degrees. By adjusting the cut angle of the vortex hole 152w, the shape and aspect ratio of the flame FL can be controlled.

For example, in the embodiment of FIG. 3A, the angle θ between the central axis 152w" of the vortex hole 152w and the normal line NL of the second surface 152b of the end plate 152 is 15 degrees. In the embodiment of FIG. 3B, the angle θ between the central axis 152w" of the vortex hole 152w and the normal line NL of the second surface 152b is 30 degrees. In the embodiment of FIG. 3C, the angle θ between the central axis 152w" of the vortex hole 152w and the normal line NL of the second surface 152b is 45 degrees. In the embodiment of FIG. 3D, the angle θ between the central axis 152w" of the vortex hole 152w and the normal line NL of the second surface 152b is 60 degrees.

Experiments were conducted on the burners 100 equipped with the vortex devices 150 shown in Figures 3A to 3D. At a power of 200,000 kcal/h, the flow ratio, swirl number, and length, width, and aspect ratio of the flame FL at 1600°C of each burner 100 were measured. Among them, the flow ratio is the ratio of the flow rate of the third nozzle 152w' of the vortex hole 152w to the flow rate of the second nozzle 152s' of the nozzle 152s.

Please refer to Figures 4 to 7, which respectively show the curve diagrams of the swirl hole 152w angle and flow ratio of the burner 100 equipped with the swirl device 150 of Figures 3A to 3D according to one embodiment of the present disclosure, the curve diagram of the swirl hole 152w angle and swirl number, the curve diagram of the swirl hole 152w angle and the length and width of the flame FL, and the curve diagram of the swirl hole 152w angle and the aspect ratio of the flame FL. It can be seen from Figure 4 that when the angle θ between the central axis 152w" of the swirl hole 152w and the normal NL of the second surface 152b is 15 degrees, 30 degrees, 45 degrees, and 60 degrees, the flow ratio is 1.63, 1.33, 0.99, and 0.62 respectively. As the angle θ increases, the flow ratio decreases gradually.

As can be seen from Figure 5, when the angle θ is 15 degrees, 30 degrees, 45 degrees, and 60 degrees, the swirl number is 0.324, 0.472, 0.837, and 1.297 respectively. As the angle θ increases, the flow ratio also increases.

As can be seen from Figure 6, when the angle θ is 15 degrees, 30 degrees, 45 degrees, and 60 degrees, the length of the flame FL at 1600°C is 43.7 cm, 46.9 cm, 20.9 cm, and 29.6 cm, respectively, and the width is 21.7 cm, 21.3 cm, 15.6 cm, and 20.5 cm, respectively. When the angle θ is 45 degrees, the length and width of the flame FL are the smallest. Therefore, it is not the case that the larger the angle θ, the smaller the length and width of the flame FL.

As can be seen from Figure 7, when the angle θ is 15 degrees, 30 degrees, 45 degrees, and 60 degrees, the aspect ratio of the flame FL at 1600°C is 2:1, 2.15:1, 1.33:1, and 1.45:1 respectively. The aspect ratio of the flame FL is the smallest when the angle θ is 45 degrees.

The vortex device 150 can reduce the aspect ratio of the flame FL and increase the swirl number. As shown in Figure 5, when the angle θ is greater than 45 degrees, the degree of increase in the swirl number is particularly obvious.

The aspect ratio of the flame FL generated by the burner 100 equipped with the vortex device 150 having vortex holes 152w with different cut angles can be applied to various furnace types, so the vortex device 150 configured for the burner 100 can be selected according to needs. For example, when the angle θ of the vortex hole 152w of the vortex device 150 is 15 degrees and 30 degrees, the burner 100 can be applied to a furnace type with a furnace body larger than 2 meters, such as a cast iron annealing furnace. When the angle θ of the vortex hole 152w of the vortex device 150 is 45 degrees and 60 degrees, the burner 100 can be applied to a furnace type with a furnace body smaller than 2 meters, such as an aluminum alloy solid solution furnace.

From the above implementation method, it can be seen that one advantage of the present disclosure is that the vortex device of the present disclosure includes an end plate disposed at the front end of the burner, wherein the end plate is provided with a nozzle and a plurality of vortex holes surrounding the nozzle. These vortex holes are obliquely penetrated in the end plate, which can shorten the length of the burner flame and increase the width of the flame, thereby reducing the aspect ratio of the flame and increasing the swirl number. In this way, the flame can be prevented from directly contacting the workpiece, thereby avoiding local high temperature of the workpiece, reducing the black skin on the surface of the workpiece, thereby improving the quality of the workpiece and increasing the product yield.

Another advantage of the present disclosure is that the cyclone device of the present disclosure can shorten the flame length of the burner, so more workpieces can be placed in the heating furnace, thereby improving production capacity.

Although the present disclosure has been disclosed as above by way of embodiments, it is not intended to limit the present disclosure. Anyone with ordinary knowledge in this technical field can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the scope defined by the attached patent application.

100: Burner

102:Front End

112: First air intake channel

112a: First air inlet

112b: First air outlet

114: Inner side

110: First air intake pipe

120: Combustion chamber

122: First nozzle

130: Second air intake pipe

132: Second air intake channel

132a: Second air inlet

132b: Second air outlet

140: Ignition

142: Ignition end

150: Cyclone device

152: End plate

152a: first surface

152b: Second surface

152s: Blowhole

152w: vortex hole

154:Connection part

A: Air

FG: Gas

FL: Flame

t: thickness

Claims (10)

A cyclone device comprises: an end plate configured to be installed at a front end of a burner, wherein the end plate comprises a first surface and a second surface opposite to each other, and the end plate has: a nozzle hole penetrating a center of the end plate, wherein when the end plate is arranged at the front end of the burner, the nozzle hole is opposite to a first nozzle of the burner; and a plurality of cyclone holes penetrating the end plate at intervals and surrounding the nozzle hole, wherein the cyclone holes extend obliquely from the first surface of the end plate to the second surface. A cyclone device as described in claim 1, wherein there is an angle between a central axis of each of the cyclone holes and a normal to the second surface, and the angle is 15 degrees to 60 degrees. A cyclone device as described in claim 1, wherein the nozzle has a second nozzle located in the second surface, and each of the cyclone holes has a third nozzle located in the second surface, and a total area of the third nozzles is equal to or greater than an area of the second nozzle. A cyclone device as described in claim 3, wherein the shapes of the third nozzles are rectangular, square, circular, or elliptical. A cyclone device as described in claim 1, wherein a thickness of one of the end plates is 10 mm to 20 mm. The cyclone device as described in claim 1 further includes a connecting portion that is arranged around the periphery of the first surface of the end plate and protrudes away from the second surface. A burner comprises: a first air intake pipe having a first air intake passage, wherein the first air intake passage has a first air intake port and a first air outlet; a combustion chamber disposed in the first air intake passage and adjacent to the first air outlet, wherein the combustion chamber has a first nozzle; a second air intake pipe disposed in the first air intake pipe and having a second air intake passage, wherein the second air intake passage has a second air intake port and a second air outlet, and the second air outlet is disposed on the combustion chamber and connected to the combustion chamber fluid; an igniter disposed in the first air intake passage and penetrating into the combustion chamber; and A vortex device comprises an end plate, wherein the end plate is arranged at a front end of the burner and covers the first air outlet, wherein the end plate comprises a first surface and a second surface opposite to each other, and the end plate has: a nozzle hole, which is arranged through a center of the end plate, wherein the nozzle hole is opposite to the first nozzle; and a plurality of vortex holes, which are arranged through the end plate at intervals and surround the nozzle hole, wherein the vortex holes extend obliquely from the first surface of the end plate to the second surface. A burner as described in claim 7, wherein there is an angle between a central axis of each of the vortex holes and a normal to the second surface, and the angle is 15 degrees to 60 degrees. A burner as described in claim 7, wherein the nozzle has a second nozzle located in the second surface, and each of the swirl holes has a third nozzle located in the second surface, and a total area of the third nozzles is equal to or greater than an area of the second nozzle. A burner as described in claim 7, wherein the cyclone device further comprises a connecting portion, which is arranged on the periphery of the first surface of the end plate and protrudes away from the second surface, and the connecting portion is connected to the first air outlet of the first air inlet pipe.

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