External heating source-free blockage-preventing and efficiency-improving rotary air preheater

Abstract

An external heating source-free blockage-preventing and efficiency-improving rotary air preheater, comprising a rotor (3). The rotor (3) is provided with a plurality of radial partition plates (1) which divide the rotor (3) into a plurality of fan-shaped chambers (9); a plurality of heat transfer elements are arranged in each fan-shaped chamber (9); each heat transfer element comprises a connection plate (4); one vertical side of the connection plate (4) is fixedly connected to the corresponding radial partition plate (1), and the other vertical side of the connection plate (4) is fixedly connected to the plate surface of a corresponding heat absorption plate (5); the two vertical sides of the heat absorption plate (5) are respectively suspended in the fan-shaped chamber (9); a plurality of semicircular protrusions (6) are evenly distributed in rows and columns on the plate surface of the heat absorption plate (5); a plurality of grooves are circumferentially formed at the lower portion of an annular wall plate on the outer side of the rotor (3); and a vibrator (8) used for vibrating for dust cleaning is arranged in each groove. According to the rotary air preheater, accumulated dust and dirt on the inner walls of the chambers and the surfaces of the heat transfer elements can be reduced and conveniently and timely cleaned, and the heat exchange efficiency can be remarkably improved.

Description

Anti-blocking and efficiency-enhancing rotary air preheater without external heating source Technical Field

[0001] The invention relates to a blockage-proof and efficiency-enhancing rotary air preheater without an external heating source. Background Art

[0002] In the existing rotary air preheater with heated surface, a plurality of partitions are provided in the radial vertical direction inside the rotor, and the partitions divide the rotor into a plurality of fan-shaped chambers, each of which is provided with a heat transfer element. A flue gas channel is provided on the right side of the shell in the vertical direction, and the flue gas channel passes through the chamber of the rotor in the shell. The lower end of the flue gas channel, that is, the cold end of the rotor, is the flue gas outlet, and the upper end of the flue gas channel, that is, the hot end of the rotor, is the flue gas inlet. A low-pressure secondary air channel and a high-pressure primary air channel are provided on the left side of the shell in the vertical direction, and the low-pressure secondary air channel and the high-pressure primary air channel respectively pass through the chamber of the rotor in the shell. The lower ends of the low-pressure secondary air channel and the high-pressure primary air channel are also provided. That is, the cold end of the rotor is the air inlet, and the upper ends of the low-pressure secondary air channel and the high-pressure primary air channel, that is, the hot end of the rotor, is the air outlet. When in use, the rotor rotates under the drag of the motor, and the flue gas with a large amount of heat passes through the flue gas channel from top to bottom, heating the heat transfer elements rotating through each chamber in the flue gas channel, causing the temperature of the heat transfer elements to rise rapidly. When the heated heat transfer elements rotate into the low-pressure secondary air channel and the high-pressure primary air channel, the air passing through the low-pressure secondary air channel and the high-pressure primary air channel from bottom to top will be heated by the heat transfer elements, thereby transferring the heat in the flue gas to the air passing through the low-pressure secondary air channel and the high-pressure primary air channel.

[0003] The existing method for cleaning dust accumulated on the inner walls of the chamber and on the surfaces of the heat transfer elements is to use pressurized gas blowing. However, as shown in Figure 6, since the connection between the heat transfer element 2 and the partition 1 is a rigid, closed, annular connection in the vertical direction, when the space between the heat transfer element 2 and the partition 1 is filled with dust, the upper and lower airflow channels are completely blocked, preventing any airflow. Since the dust is enclosed and can only move up and down, even using high-pressure gas blowing is difficult to remove the dust stuck between the heat transfer element 2 and the partition 1. This results in poor cleaning efficiency, which in turn reduces the heat exchange efficiency of the heated surface rotary air preheater and causes significant energy waste. Furthermore, even if the space between the heat transfer element 2 and the partition 1 is not filled with dust, the dust adhering to the heat transfer element 2 is difficult to be blown off by the airflow because the side of the heat transfer element 2 is not open. Summary of the Invention

[0004] The purpose of the present invention is to provide a rotary air preheater without external heating source, which can reduce the accumulation of dust and scale on the inner wall of the chamber and the surface of the heat transfer element, remove the dust and scale conveniently and promptly, and significantly improve the heat exchange efficiency of the rotary air preheater with heating surface and anti-blocking and high efficiency.

[0005] The anti-clogging and efficiency-enhancing rotary air preheater without an external heat source of the present invention comprises a rotor, which comprises a plurality of radial partitions with plate surfaces located in a vertical direction. The plurality of radial partitions divide the rotor into a plurality of sector-shaped bins. A plurality of heat transfer elements are arranged in each sector-shaped bin from top to bottom. Each of the heat transfer elements comprises a connecting plate. The plate surface of each connecting plate is located in a vertical direction. One vertical side of the connecting plate is fixedly connected to the radial partition, and the other vertical side of the connecting plate is fixedly connected to the plate surface of the heat absorbing plate. The two vertical sides of the heat absorbing plate are respectively suspended in the sector-shaped bin. The plate surface of the heat absorbing plate is located in a vertical direction. A plurality of semicircular protrusions are evenly distributed in horizontal rows and vertical columns on the plate surfaces of the heat absorbing plate and the connecting plate. A plurality of semicircular protrusions are evenly distributed in horizontal rows and vertical columns on the plate surfaces of the radial partitions.

[0006] A plurality of grooves are provided around the lower part of the annular wall plate on the outer side of the rotor, and a vibrator for vibrating and cleaning is provided in each groove. When the vibrator vibrates and cleans, the two vertical sides of the heat absorbing plate can generate reciprocating vibrations with an amplitude greater than 1 mm.

[0007] Preferably, a plurality of circular air holes are evenly distributed on the surface of the heat absorbing plate in horizontal rows and vertical columns, the distance between the edges of the air holes is 100mm-200mm, and the radius of the air holes is 30mm-50mm.

[0008] Preferably, a plurality of circular ventilation holes are evenly distributed on the plate surface of the radial partition in horizontal rows and vertical columns, the distance between the edges of the ventilation holes is 100mm-200mm, and the radius of the ventilation holes is 30mm-50mm.

[0009] Preferably, the plate surface of the connecting plate is arranged along the circumferential surface direction of the rotor, the connecting plate and the heat absorbing plate are made of stainless steel, and the number of the vibrators is 3-8.

[0010] Preferably, a casing support plate is provided around the outer side of the rotor, and an inspection and maintenance platform is provided on the outer side of the casing support plate. The inspection and maintenance platform includes a patrol inspection channel and a ladder for climbing onto the inspection and maintenance platform.

[0011] Preferably, the distance between adjacent raised edges on the heat absorbing plate is 3mm-8mm, and the radius of the raised edge is 0.5mm-2mm. The distance between adjacent raised edges on the radial partition is 3mm-8mm, and the radius of the raised edge is 0.5mm-2mm.

[0012] Preferably, the rotor includes an air side and a flue gas side, the upper end of the rotor is a hot end, and the lower end is a cold end, the rotor is mounted on a rotor shaft, and the rotor shaft is arranged in a vertical direction, the hot end of the flue gas side of the rotor is a smoke inlet, and the cold end of the flue gas side of the rotor is a smoke outlet, the smoke inlet and the smoke outlet are connected by a smoke channel that passes axially through the smoke gas side of the rotor, the hot end of the air side of the rotor is a hot air outlet, and the cold end of the air side of the rotor is an air inlet, and the air inlet and the hot air outlet are connected by an air channel that passes axially through the air side of the rotor.

[0013] When the anti-clogging and efficiency-enhancing rotary air preheater without external heat source of the present invention is in use, a vibrator can be used to continuously vibrate during the operation of the rotary air preheater to remove dust from the heat absorbing plate, connecting plate and radial partition plate. The design of the present invention that multiple semicircular protrusions are evenly distributed in horizontal rows and vertical columns on the plate surface of the heat absorbing plate and the connecting plate, and multiple semicircular protrusions are evenly distributed in horizontal rows and vertical columns on the plate surface of the radial partition plate can play an anti-adhesion role, thereby making it easier for dust to be separated from the plate surface of the heat absorbing plate, connecting plate and radial partition plate during the vibration process, and the two vertical side edges of the heat absorbing plate are respectively suspended in the fan-shaped bin, and when the vibrator is vibrated to clean the dust, the two vertical side edges of the heat absorbing plate can generate a reciprocating jump with a swing amplitude greater than 1 mm, which also makes it difficult for dust and scale to accumulate on the surface of the heat transfer element. Therefore, the anti-clogging and efficiency-enhancing rotary air preheater without external heat source of the present invention has the characteristics of reducing dust and scale accumulation on the inner wall of the chamber and the surface of the heat transfer element, and removing dust and scale accumulation is convenient and timely, which can significantly improve the heat exchange efficiency of the heated surface rotary air preheater.

[0014] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a top-down perspective view of the rotor portion of a rotary air preheater with anti-clogging and efficiency-enhancing function without an external heat source according to the present invention;

[0016] FIG2 is an enlarged front view of the radial partition portion of the anti-clogging and efficiency-enhancing rotary air preheater without an external heat source according to the present invention;

[0017] FIG3 is a top view of FIG2;

[0018] FIG4 is an enlarged front view of a heat absorbing plate portion of a rotary air preheater for preventing blockage and improving efficiency without an external heat source according to the present invention;

[0019] FIG. 5 is a top view of FIG. 4 .

[0020] FIG6 is a schematic structural diagram of a conventional heat transfer element. Implementation Method

[0021] As shown in Figures 1, 2, 3, 4 and 5, the anti-clogging and efficiency-enhancing rotary air preheater without external heat source of the present invention includes a rotor 3, which includes a plurality of radial partitions 1 with plate surfaces located in the vertical direction. The plurality of radial partitions 1 divide the rotor into a plurality of sector-shaped bins 9. A plurality of heat transfer elements are arranged from top to bottom in each sector-shaped bin 9. Each heat transfer element includes a connecting plate 4. The plate surface of each connecting plate 4 is located in the vertical direction. One vertical side of the connecting plate 4 is fixedly connected to the radial partition 1, and the other vertical side of the connecting plate 4 is fixedly connected to the plate surface of the heat absorbing plate 5. The two vertical sides of the heat absorbing plate 5 are respectively suspended in the sector-shaped bin. The plate surface of the heat absorbing plate 5 is located in the vertical direction. A plurality of semicircular protrusions 6 are evenly distributed in horizontal rows and vertical columns on the plate surfaces of the heat absorbing plate 5 and the connecting plate 4. A plurality of semicircular protrusions 7 are evenly distributed in horizontal rows and vertical columns on the plate surfaces of the radial partition 1.

[0022] As shown in Figure 1, a plurality of grooves are provided around the lower part of the annular wall plate on the outside of the rotor 3, and a vibrator 8 for vibrating and cleaning is provided in each groove. When the vibrator 8 vibrates and cleans, the two vertical sides of the heat absorbing plate 5 can generate reciprocating vibrations with an amplitude greater than 1 mm.

[0023] As a further improvement of the present invention, a plurality of circular air holes are evenly distributed in horizontal rows and vertical columns on the surface of the heat absorbing plate 5, the distance between the edges of the air holes is 100mm-200mm, and the radius of the air holes is 30mm-50mm.

[0024] As a further improvement of the present invention, a plurality of circular ventilation holes are evenly distributed in horizontal rows and vertical columns on the surface of the radial partition 1, the distance between the edges of the ventilation holes is 100mm-200mm, and the radius of the ventilation holes is 30mm-50mm.

[0025] As a further improvement of the present invention, the surface of the connecting plate 4 is arranged along the circumferential surface of the rotor 3, the connecting plate 4 and the heat absorbing plate 5 are made of stainless steel, and the number of the vibrators 8 is 3-8.

[0026] As a further improvement of the present invention, a casing support plate (not shown in the figure) is provided around the outer side of the above-mentioned rotor 1, and an inspection and maintenance platform (not shown in the figure) is provided on the outer side of the casing support plate. The inspection and maintenance platform includes a patrol inspection channel and a ladder for climbing onto the inspection and maintenance platform (not shown in the figure).

[0027] As a further improvement of the present invention, the distance between the edges of adjacent protrusions 6 on the above-mentioned heat absorbing plate 5 is 3mm-8mm, the radius of the protrusion 6 is 0.5mm-2mm, and the distance between the edges of adjacent protrusions 7 on the radial partition 1 is 3mm-8mm, and the radius of the protrusion 7 is 0.5mm-2mm.

[0028] As a further improvement of the present invention, as shown in Figure 1, the above-mentioned rotor 1 includes an air side and a flue gas side, the upper end of the rotor 1 is a hot end, and the lower end is a cold end. The rotor 1 is mounted on a rotor shaft (not shown in the figure), and the rotor shaft is arranged in a vertical direction. The hot end of the flue gas side of the rotor 1 is a smoke inlet 2, and the cold end of the flue gas side of the rotor 1 is a smoke outlet. The smoke inlet 2 and the smoke outlet are connected by a smoke channel that axially passes through the smoke side of the rotor 1. The hot end of the air side of the rotor 1 is a hot air outlet 10, and the cold end of the air side of the rotor 1 is an air inlet. The air inlet and the hot air outlet 10 are connected by an air channel that axially passes through the air side of the rotor 1.

[0029] When the anti-blocking and efficiency-enhancing rotary air preheater without external heat source of the present invention is in use, the vibrator 8 can be used to continuously vibrate during the operation of the rotary air preheater to remove dust from the heat absorbing plate 5, the connecting plate 4 and the radial partition 1. The heat absorbing plate 5 and the connecting plate 4 are evenly distributed with multiple semicircular protrusions 6 in horizontal rows and vertical columns on the plate surface of the present invention, and the radial partition 1 is evenly distributed with multiple semicircular protrusions 7 in horizontal rows and vertical columns on the plate surface, which can prevent dust and dirt from adhering to the plate surface. As a result, dust and dirt are more easily removed from the surfaces of the heat absorbing plate 5, the connecting plate 4, and the radial partition 1 by the vibration of the vibrator 8. The two vertical sides of the heat absorbing plate 5 are respectively suspended in the fan-shaped bin. When the vibrator 8 vibrates to clean the dust, the two vertical sides of the heat absorbing plate 5 can produce a reciprocating swing with an amplitude greater than 1 mm. This technical feature also makes it difficult for dust and dirt to accumulate on the inner wall of the bin and the surface of the heat transfer element, because the dust and dirt on the heat absorbing plate 5 will fall off during the high-frequency vibration of the heat absorbing plate 5. Therefore, the anti-clogging and efficiency-enhancing rotary air preheater without external heat source of the present invention has the characteristics of reducing dust and dirt accumulation on the inner wall of the bin and the surface of the heat transfer element, and removing dust and dirt is convenient and timely, which can significantly improve the heat exchange efficiency of the heated surface rotary air preheater.

[0030] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary engineers and technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A blockage-proof and efficiency-enhancing rotary air preheater without an external heat source, comprising a rotor (3), the rotor comprising a plurality of radial partitions (1) with plate surfaces located in a vertical direction, the plurality of radial partitions (1) dividing the rotor into a plurality of sector-shaped bins (9), each sector-shaped bin (9) being provided with a plurality of heat transfer elements, characterized in that: Each of the heat transfer elements comprises a connecting plate (4), the plate surface of each connecting plate (4) is located in the vertical direction, one vertical side of the connecting plate (4) is fixedly connected to the radial partition plate (1), and the other vertical side of the connecting plate (4) is fixedly connected to the plate surface of the heat absorbing plate (5), the two vertical sides of the heat absorbing plate (5) are respectively suspended in the fan-shaped bin, the plate surface of the heat absorbing plate (5) is located in the vertical direction, a plurality of semicircular protrusions (6) are evenly distributed in horizontal rows and vertical columns on the plate surfaces of the heat absorbing plate (5) and the connecting plate (4), and a plurality of semicircular protrusions (7) are evenly distributed in horizontal rows and vertical columns on the plate surface of the radial partition plate (1); A plurality of grooves are arranged around the lower part of the annular wall plate on the outer side of the rotor (3), and a vibrator (8) for vibrating and cleaning is arranged in each groove. When the vibrator (8) vibrates and cleans, the two vertical sides of the heat absorbing plate (5) can generate reciprocating vibrations with a swing amplitude greater than 1 mm.

2. The anti-clogging and efficiency-enhancing rotary air preheater without external heating source according to claim 1 is characterized in that: A plurality of circular air holes are evenly distributed in horizontal rows and vertical columns on the plate surface of the heat absorbing plate (5), the distance between the edges of the air holes is 100 mm to 200 mm, and the radius of the air holes is 30 mm to 50 mm.

3. The anti-clogging and efficiency-enhancing rotary air preheater without external heating source according to claim 2 is characterized in that: A plurality of circular ventilation holes are evenly distributed in horizontal rows and vertical columns on the surface of the radial partition plate (1), the distance between the edges of the ventilation holes is 100 mm to 200 mm, and the radius of the ventilation holes is 30 mm to 50 mm.

4. The anti-clogging and efficiency-enhancing rotary air preheater without external heating source according to claim 3 is characterized in that: The plate surface of the connecting plate (4) is arranged along the circumferential surface direction of the rotor (3); the connecting plate (4) and the heat absorbing plate (5) are made of stainless steel; and the number of the vibrators (8) is 3 to 8.

5. The anti-clogging and efficiency-enhancing rotary air preheater without external heating source according to claim 4 is characterized in that: The outer side of the rotor (1) is surrounded by a casing support plate, and the outer side of the casing support plate is provided with an inspection and maintenance platform, which comprises a patrol inspection channel and a ladder for climbing onto the inspection and maintenance platform.

6. The anti-clogging and efficiency-enhancing rotary air preheater without external heating source according to any one of claims 1 to 5, characterized in that: The distance between the edges of adjacent protrusions (6) on the heat absorbing plate (5) is 3 mm to 8 mm, and the radius of the protrusion (6) is 0.5 mm to 2 mm; the distance between the edges of adjacent protrusions (7) on the radial partition (1) is 3 mm to 8 mm, and the radius of the protrusion (7) is 0.5 mm to 2 mm.

7. The anti-clogging and efficiency-enhancing rotary air preheater without external heating source according to claim 6 is characterized in that: The rotor (1) comprises an air side and a smoke side, the upper end of the rotor (1) being a hot end and the lower end being a cold end, the rotor (1) being mounted on a rotor shaft, the rotor shaft being arranged in a vertical direction, the hot end of the smoke side of the rotor (1) being a smoke inlet (2), the cold end of the smoke side of the rotor (1) being a smoke outlet, the smoke inlet (2) and the smoke outlet being connected via a smoke passage axially passing through the smoke side of the rotor (1), the hot end of the air side of the rotor (1) being a hot air outlet (10), the cold end of the air side of the rotor (1) being an air inlet, the air inlet and the hot air outlet (10) being connected via an air passage axially passing through the air side of the rotor (1).

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