Energy-saving plate type air preheater

Abstract

The invention relates to the technical field, in particular to an energy-saving plate type air preheater. Comprising a plurality of air heating plates, one sides of the air heating plates are connected with air outlet pipes, the outer ends of the air outlet pipes are connected with heating assemblies, the air outlet ends of the air heating plates are provided with cleaning shells, the air outlet pipes are located in the cleaning shells, two telescopic heat exchange plates are arranged in the air heating plates, and a closed heat exchange cavity is formed between the two telescopic heat exchange plates; a smoke channel is formed between the telescopic heat exchange plate and the inner wall of the air heating plate, the telescopic heat exchange plate can move into the cleaning shell in the length direction of the air heating plate, the end, away from the cleaning shell, of the telescopic heat exchange plate is connected with a scraper, and when the telescopic heat exchange plate moves, the inner wall of the air heating plate is cleaned through the scraper.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field, in particular to an energy-saving plate type air preheater. BACKGROUND

[0002] The air preheater is a commonly used device on the boiler, which is essentially a heat exchanger, and the main components include a heat exchange tube bundle, two kinds of media for heat exchange, i.e. flue gas and air, which pass through the inside and outside of the heat exchange tube respectively, so as to perform heat exchange, thereby preheating the air for use in the boiler. The plate type heat exchanger has the characteristic of high turbulence intensity compared with the shell and tube heat exchanger, and has higher heat transfer efficiency under the same conditions. According to the difference of the heat exchange medium in the plate type heat exchanger, it can be divided into a flue gas air preheater and a wind heat air preheater. For the flue gas air preheater, the heat exchange medium passing through the plate type heat exchanger is flue gas. When the existing air preheater is used, a flue gas filter needs to be installed at the flue gas inlet end, but when the filtering effect of the flue gas filter is strong, the amount of flue gas inside the heat exchanger will be greatly reduced, affecting the air preheating effect. Therefore, when the flue gas air preheater is actually used, a flue gas filter with a slightly weaker filtering effect needs to be used, which will cause the flue dust inside the plate type heat exchanger to easily accumulate, and it is inconvenient to clean.

[0003] Therefore, the present application provides an energy-saving plate type air preheater, which solves the problem of inconvenient cleaning of flue dust inside the plate type heat exchanger in the prior art, efficiently cleans the flue gas inside the plate type heat exchanger, and guarantees the amount of flue gas inside the plate type heat exchanger. SUMMARY

[0004] To solve the above problems, the present application provides an energy-saving plate type air preheater.

[0005] The technical scheme adopted by the present application to solve the technical problems is: an energy-saving plate type air preheater, comprising a plurality of air heating plates, one side of the air heating plate is connected with an air outlet pipe, the outer end of the air outlet pipe is connected with a heating assembly, the air outlet end of the air heating plate is provided with a cleaning shell, and the air outlet pipe is located in the cleaning shell, the other side of the air heating plate is connected with an air inlet pipe. The inside of the air heating plate is provided with two telescopic heat exchange plates, a closed heat exchange cavity is formed between the two telescopic heat exchange plates, a flue gas passage is formed between the telescopic heat exchange plate and the inner wall of the air heating plate, the telescopic heat exchange plate can move to the inside of the cleaning shell along the length direction of the air heating plate, one end of the telescopic heat exchange plate away from the cleaning shell is connected with a scraper, and the inner wall of the air heating plate is cleaned by the scraper when the telescopic heat exchange plate moves.

[0006] As optimization, the heat exchange cavity is provided with a limiting plate away from one end of the air inlet pipe, the limiting plate is in sliding sealing connection with the inner wall of the air heating plate, the inner side of the heat exchange cavity is provided with a limiting protrusion, the limiting protrusion is arranged adjacent to the limiting plate, and the limiting protrusion is used for preventing the limiting plate from moving to the inside of the air heating plate.

[0007] As optimization, the scraper is in contact sealing with the inner wall of the air heating plate, the middle part of the scraper is provided with an air inlet, and the air inlet pipe penetrates through the air inlet and the inside of the heat exchange cavity.

[0008] As optimization, the outer end of the air heating plate is connected with two groups of rope winding motors, the limiting plate at the upper end of the heat exchange cavity and the limiting plate at the lower end of the heat exchange cavity are connected with operation ropes, and the limiting plate and the scraper are connected with auxiliary springs. The side, away from the heat exchange cavity, of the limiting plate is connected with a guide roller, one end of the operation rope is fixedly connected with the scraper, the other end of the operation rope passes through the limiting plate, winds around the guide roller, and then passes through the limiting plate and the scraper in sequence and is connected with the rope winding motor.

[0009] As optimization, the inner side of the air heating plate is provided with a limiting telescopic rod at the top, the limiting telescopic rod is located at the side, away from the air outlet pipe, of the limiting protrusion, and the limiting telescopic rod can limit the scraper when being elongated downward.

[0010] As optimization, the telescopic heat exchange plate is a continuous M-shaped bending plate, a cleaning part is formed adjacent to the scraper, and the cleaning part can contact and clean the inner wall of the air heating plate when the telescopic heat exchange plate is compressed.

[0011] As optimization, the top of the cleaning shell is connected with auxiliary blowing assemblies on both sides, the air outlets of the auxiliary blowing assemblies are inclined downward, and the bottom of the cleaning shell is provided with an openable and closable blowdown door.

[0012] As optimization, the heating assembly comprises an air inlet pipe connected to the top of the cleaning shell and a flue gas passage, and an air outlet pipe connected to the bottom of the flue gas passage.

[0013] The energy-saving plate type air preheater has the following advantages: The telescopic heat exchange plate arranged in the inside of the air heating plate can effectively increase the contact area between flue gas and air and improve the air preheating effect. The heat exchange cavity is formed between the two telescopic heat exchange plates, the heat exchange cavity as a whole can move along the inner cavity of the air heating plate, the scraper at the outer end of the heat exchange cavity can clean the smoke dust in the inner cavity of the air heating plate and send the smoke dust into the cleaning cavity, efficient treatment of the smoke dust is realized, the equipment does not need to be disassembled, the cleaning efficiency is effectively improved, and the accumulation of the smoke dust is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of the shaft of the present application.

[0015] Figure 2 is a schematic view of the front of the present application.

[0016] Figure 3 is a schematic view of the A-A section of the present application. Figure 2

[0017] Figure 4 is a schematic view of the shaft of the air heating plate of the present application.

[0018] Figure 5 is a schematic view of the front of the air heating plate of the present application.

[0019] Figure 6 is a schematic view of the B-B section of the present application. Figure 5

[0020] Figure 7 is a schematic view of the G portion of the present application. Figure 6

[0021] Figure 8 is a schematic view of the back of the air heating plate of the present application.

[0022] Figure 9 is a schematic view of the back of the internal structure of the air heating plate of the present application.

[0023] Figure 10 is a schematic view of the D portion of the present application. Figure 9

[0024] Figure 11 is a schematic view of the internal structure of the air heating plate of the present application.

[0025] Figure 12 is a schematic view of the E portion of the present application. Figure 11

[0026] Figure 13 is a schematic view of the right of the air heating plate of the present application.

[0027] Figure 14 is a schematic view of the C-C section of the present application. Figure 13

[0028] Figure 15 is a schematic view of the F portion of the present application. Figure 14

[0029] ​​​​​​​Wherein, 1, air heating plate, 2, air outlet pipe, 3, heating assembly, 4, cleaning shell, 5, air inlet pipe, 6, telescopic heat exchange plate, 7, heat exchange cavity, 8, flue gas passage, 9, scraper, 10, limiting plate, 11, limiting protrusion, 12, rope collecting motor, 13, operating rope, 14, auxiliary spring, 15, guide roller, 16, limiting telescopic rod, 17, cleaning part, 18, auxiliary air blowing assembly, 19, air inlet pipe, 20, air outlet pipe. DETAILED DESCRIPTION

[0030] As shown in Figures 1-15 , an energy-saving plate type air preheater, comprising a plurality of air heating plates 1, one side of the air heating plate 1 is connected with an air outlet pipe 2, the outer end of the air outlet pipe 2 is connected with a heating assembly 3, the air outlet end of the air heating plate 1 is provided with a cleaning shell 4, the air outlet pipe 2 is located in the cleaning shell 4, the other side of the air heating plate 1 is connected with an air inlet pipe 5. The inside of the air heating plate 1 is provided with two telescopic heat exchange plates 6, the two telescopic heat exchange plates 6 form a closed heat exchange cavity 7, the telescopic heat exchange plate 6 and the inner wall of the air heating plate 1 form a flue gas passage 8, the telescopic heat exchange plate 6 can move to the inside of the cleaning shell 4 along the length direction of the air heating plate 1, the end of the telescopic heat exchange plate 6 away from the cleaning shell 4 is connected with a scraper 9, when the telescopic heat exchange plate 6 moves, the inner wall of the air heating plate 1 is cleaned by the scraper 9.

[0031] The air outlet pipe 2 is a flexible pipe, and the flexible pipe is located in the cleaning shell 4.

[0032] The telescopic heat exchange plate 6 is a foldable metal sheet, as shown in Figure 3 , when the telescopic heat exchange plate 6 is folded, the telescopic heat exchange plate 6 is compressed and folded from right to left, and the inner wall of the air heating plate 1 is cleaned by the scraper 9 when the telescopic heat exchange plate 6 moves along the air heating plate 1.

[0033] As shown in Figure 3 , the end of the heat exchange cavity 7 away from the air inlet pipe 5 is provided with a limiting plate 10, the limiting plate 10 is in sliding sealing connection with the inner wall of the air heating plate 1, the inside of the heat exchange cavity 7 is provided with a limiting protrusion 11, the limiting protrusion 11 is arranged adjacent to the limiting plate 10, and the limiting protrusion 11 is used to prevent the limiting plate 10 from moving to the inside of the air heating plate 1.

[0034] The side of the air heating plate 1 away from the air inlet pipe 5 is an opening, the limiting plate 10 can be removed from the opening end of the air heating plate 1, when the telescopic heat exchange plate 6 is removed from the inside of the air heating plate 1, the smoke dust in the inside of the air heating plate 1 can be carried outwards into the cleaning shell 4.

[0035] As shown in Figure 7As shown, the scraper 9 is in contact with the inner wall of the air heating plate 1, the middle of the scraper 9 is provided with an air inlet, and the air inlet is connected with the heat exchange cavity 7 through the air inlet pipe 5.

[0036] As shown in Figure 3 , Figure 9 and Figure 10 , the outer end of the air heating plate 1 is connected with two groups of rope winding motors 12, the two groups of rope winding motors 12 are respectively connected with the limiting plates 10 at the upper end of the heat exchange cavity 7 and the limiting plates 10 at the lower end of the heat exchange cavity 7 through the operating ropes 13, and the limiting plates 10 are connected with the auxiliary springs 14 between the limiting plates 10 and the scraper 9. The side of the limiting plate 10 away from the heat exchange cavity 7 is connected with a guide roller 15, one end of the operating rope 13 is fixedly connected with the scraper 9, and the other end of the operating rope 13 is connected with the rope winding motor 12 after passing through the limiting plate 10, winding around the guide roller 15, and then passing through the limiting plate 10 and the scraper 9 in sequence.

[0037] When the rope winding motor 12 winds up the operating rope 13, the limiting plate 10 cannot continue to move towards the air inlet pipe 5 due to the limiting protrusion 11. Under the action of the pulling force of the operating rope 13, the right end of the telescopic heat exchange plate 6 moves leftwards, and the telescopic heat exchange plate 6 is compressed to the left side of the limiting telescopic rod 16.

[0038] As shown in Figure 3 , Figure 4 and Figure 12 , the inner side of the air heating plate 1 is provided with a limiting telescopic rod 16 at the top, the limiting telescopic rod 16 is located on the side of the limiting protrusion 11 away from the air outlet pipe 20, and the limiting telescopic rod 16 can limit the scraper 9 when it is elongated downward.

[0039] When the telescopic heat exchange plate 6 is compressed to the left side of the limiting telescopic rod 16, the limiting telescopic rod 16 is elongated to limit the scraper 9. At this time, the rope winding motor 12 releases a certain length of the operating rope 13, and under the action of the auxiliary spring 14, the telescopic heat exchange plate 6 is thrown out of the opening end of the air heating plate 1, and the telescopic heat exchange plate 6 carries the smoke dust together and is thrown into the cleaning shell 4.

[0040] As shown in Figure 7 , the telescopic heat exchange plate 6 is a continuous M-shaped bending plate, and the telescopic heat exchange plate 6 forms a cleaning part 17 adjacent to the scraper 9. When the telescopic heat exchange plate 6 is compressed, the cleaning part 17 can contact and clean the inner wall of the air heating plate 1.

[0041] The folding width of the cleaning part 17 is greater than that of the telescopic heat exchange plate at other positions. When the scraper 9 is limited by the limiting protrusion 11, the cleaning part 17 can clean the inner wall of the air heating plate 1 which cannot be reached by the scraper 9.

[0042] AsFigure 1 As shown, the top of the cleaning shell 4 is connected with auxiliary blowing assembly 18, the air outlet of the auxiliary blowing assembly 18 is inclined downward, the bottom of the cleaning shell 4 is provided with a openable and closable pollution discharge door.

[0043] As shown in Figure 1 and Figure 3 The heating assembly 3 includes the top of the cleaning shell 4, the top of the flue gas passage 8 is connected with the air inlet pipe 19, and the bottom of the flue gas passage 8 is connected with the air outlet pipe 20.

[0044] The heating assembly 3 can be an air heater, a heat pump, a hot air machine, etc.

[0045] Method for use: The device in the specific use, air through the air inlet pipe 5 into the heat exchange cavity 7, flue gas connection air inlet pipe 19; Air and telescopic heat exchange plate 6 after contact to get preheating, preheated air through the heating assembly 3 heating after discharge to the next process; When the need to clean the dust on the inner wall of the air heating plate 1, through the rope assembly for the operation of the rope 13 winding, the operation of the rope 13 under the guidance of the guide roller 15 pull the scraper 9 along the inner cavity of the air heating plate 1, make the scraper 9 on the inner wall of the air heating plate 1 dust scraping; As Figure 14 shown in the position relationship, when the scraper 9 moves to the left side of the limiting telescopic rod 16, the limiting telescopic rod 16 is elongated, and the limiting telescopic rod 16 is limited to the scraper 9; At this time, the rope winding motor 12 releases the operation of the rope 13, under the action of the auxiliary spring 14, the limiting plate 10 is popped out from the opening end of the air heating plate 1, the telescopic heat exchange plate 6 carries the dust on the inner wall of the air heating plate 1 outward, the cleaning part 17 continues to clean the inner wall of the air heating plate 1, and the dust is thrown into the cleaning shell 4, realizing the cleaning of the inner wall of the air heating plate 1. After cleaning, the limiting telescopic rod 16 is shortened, the rope winding motor 12 is shortened, and the operation of the rope 13 is completely retracted into the air heating plate 1.

[0046] In order to facilitate the above process, the position detection sensor, proximity switch, electromagnet, etc. are arranged in the air heating plate 1, which are all conventional contents selected by the person skilled in the art according to the actual production situation, which will not be described here.

[0047] The above detailed description is only a specific case of the present application, the patent protection scope of the present application includes but is not limited to the product form and style of the above detailed description, any energy-saving plate air preheater meeting the claims of the present application and any appropriate changes or modifications made by those skilled in the corresponding technical field shall fall within the patent protection scope of the present application.

Claims

1. An energy-saving plate air preheater, characterized in that: It includes several air heating plates (1), one side of the air heating plate (1) is connected to an air outlet pipe (2), the outer end of the air outlet pipe (2) is connected to a heating component (3), the air outlet end of the air heating plate (1) is provided with a cleaning shell (4), the air outlet pipe (2) is located inside the cleaning shell (4), and the other side of the air heating plate (1) is connected to an air inlet pipe (5). The air heating plate (1) is provided with two retractable heat exchange plates (6) inside, and a closed heat exchange cavity (7) is formed between the two retractable heat exchange plates (6). A flue gas channel (8) is formed between the retractable heat exchange plates (6) and the inner wall of the air heating plate (1). The retractable heat exchange plates (6) can move along the length of the air heating plate (1) to the inside of the cleaning shell (4). A scraper (9) is connected to the end of the retractable heat exchange plates (6) away from the cleaning shell (4). When the retractable heat exchange plates (6) move, the inner wall of the air heating plate (1) is cleaned by the scraper (9).

2. The energy-saving plate air preheater according to claim 1, characterized in that: A limiting plate (10) is provided at one end of the heat exchange chamber (7) away from the air inlet pipe (5). The limiting plate (10) is slidably sealed to the inner wall of the air heating plate (1). A limiting protrusion (11) is provided on the inner side of the heat exchange chamber (7). The limiting protrusion (11) is arranged adjacent to the limiting plate (10). The limiting protrusion (11) is used to prevent the limiting plate (10) from moving into the air heating plate (1).

3. The energy-saving plate air preheater according to claim 2, characterized in that: The scraper (9) is in contact with and sealed to the inner wall of the air heating plate (1). An air inlet is opened in the middle of the scraper (9), and the air inlet pipe (5) is connected to the interior of the heat exchange chamber (7) through the air inlet.

4. The energy-saving plate air preheater according to claim 2, characterized in that: Two sets of rope-winding motors (12) are connected to the outer end of the air heating plate (1). The two sets of rope-winding motors (12) are connected to the upper limit plate (10) of the heat exchange chamber (7) and the lower limit plate (10) of the heat exchange chamber (7) by operating ropes (13). An auxiliary spring (14) is connected between the limit plate (10) and the scraper (9). The limiting plate (10) is connected to a guide roller (15) on the side away from the heat exchange chamber (7). One end of the operating rope (13) is fixed to the scraper (9). The other end of the operating rope (13) passes through the limiting plate (10), goes around the guide roller (15), passes through the limiting plate (10) and the scraper (9) in sequence, and is connected to the rope winding motor (12).

5. An energy-saving plate air preheater according to claim 4, characterized in that: The air heating plate (1) has a limiting telescopic rod (16) on its inner top. The limiting telescopic rod (16) is located on the side of the limiting protrusion (11) away from the exhaust pipe (20). When the limiting telescopic rod (16) extends downward, it can limit the scraper (9).

6. The energy-saving plate air preheater according to claim 1, characterized in that: The retractable heat exchange plate (6) is a continuous M-shaped bent plate. A cleaning section (17) is formed at the junction of the retractable heat exchange plate (6) and the scraper (9). When the retractable heat exchange plate (6) is compressed, the cleaning section (17) can clean the inner wall of the air heating plate (1).

7. An energy-saving plate air preheater according to claim 1, characterized in that: The top two sides of the cleaning shell (4) are connected to auxiliary blowing components (18), the air outlet of the auxiliary blowing components (18) is inclined downward, and the bottom of the cleaning shell (4) is provided with an openable and closable drain door.

8. An energy-saving plate air preheater according to claim 1, characterized in that: The heating assembly (3) includes an air inlet pipe (19) connected to the top of the cleaning shell (4), and an exhaust pipe (20) connected to the bottom of the flue gas passage (8).

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