Efficient sealing device for air pre-heater

Abstract

The invention discloses an efficient sealing device for an air pre-heater, and relates to the technical field of boilers and accessory systems of the boilers, the efficient sealing device for the air pre-heater comprises a corner plate, an outer frame assembly, a hot end guide assembly, a sealing assembly, a flow blocking assembly and a truss mounting assembly, the outer frame assembly comprises an outer frame protection plate, a first installation ring and a second installation ring, the flow blocking assembly is fixedly installed at the bottom of the second installation ring and comprises an anti-backlash piece, a flow guide plate and an arc-shaped plate, and the truss installation assembly is fixedly installed in the outer frame protection plate. In a thermal state, the sealing floating plate does not thermally deform along with an old rotor partition plate, a constantly small sealing gap between the sealing floating plate and the hot end sector plate can be kept, the sealing floating plate is not in contact with the hot end sector plate and is not abraded, the sealing gap self-adaption and self-compensation effect is achieved, the gap eliminating piece and the arc-shaped plate are separated through the flow guide plate to form a turbulent flow groove, and the air leakage pressure difference is reduced; the problems of abrasion of sealing fins of the sector plate of the air pre-heater and overall air leakage are greatly solved.

Description

Technical Field

[0001] The invention relates to the technical field of boiler design and its auxiliary systems, and specifically to a high-efficiency sealing device for an air preheater. Background Art

[0002] Air preheater, also known as air preheater, is a heating surface where the flue gas in the flue at the tail end of the boiler preheats the air before entering the boiler to a certain temperature through the internal heat sink. It is a device used to improve the heat exchange performance of the boiler and reduce energy consumption. When working, the air preheater absorbs heat from the flue gas, and then transfers the heat to the cold air through a continuously rotating heat transfer element composed of a special shape of metal plates. Thousands of high-efficiency heat transfer elements are tightly placed in the fan-shaped bin. The flue gas and air flow alternately through the heat transfer elements in the bin. The heat transfer elements absorb heat from the hot flue gas, and then this part of the heat transfer elements is flushed by the air flow and releases the stored heat, so that the air temperature is greatly increased. Nowadays, the commonly used sealing systems of air preheaters include radial seals, axial seals, bypass annular seals and static seals. On the premise of ensuring that the adjustment of the sealing gaps of each part meets the requirements of the specification, the fan plate lifting mechanism is installed. The lifting mechanism executes the lifting or lowering command issued by the air leakage control system, lifts or pushes the fan plate to the specified position, compensates for the "mushroom-shaped" thermal deformation of the air preheater rotor, and keeps the sealing gap adjustable at all times.

[0003] The existing high-efficiency sealing devices for air preheaters mostly use contact sealing technology, which achieves contact between the seal and the fan plate in the hot state to compensate for the sealing gap and reduce the air leakage rate. However, the contact seal will seriously wear the fan plate during long-term operation, increase the air leakage rate of the air preheater, and reduce the service life.

[0004] In order to solve the problems existing in the prior art, the present invention provides an air preheater high-efficiency sealing device. Summary of the invention

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A high-efficiency sealing device for an air preheater comprises a corner plate, an outer frame assembly, a hot end guide assembly, a sealing assembly, a baffle assembly and a truss mounting assembly, wherein the outer frame assembly is fixedly mounted on the top of the corner plate, the outer frame assembly comprises an outer frame guard plate, a first mounting ring and a second mounting ring, the baffle assembly is fixedly mounted on the bottom of the second mounting ring, the baffle assembly comprises an anti-gap sheet, a guide plate and an arc plate, the truss mounting assembly is fixedly mounted inside the outer frame guard plate, the truss mounting assembly comprises an adjusting rod, a butt pipe and a fixing rod, and the sealing assembly is fixedly mounted on the bottom of the first mounting ring and the top of the second mounting ring, respectively.

[0007] A further improvement of the technical solution of the present invention is that the sealing assembly includes a first clamping plate, a second clamping plate, a fixed floating plate and a sealing floating plate, the first clamping plate and the second clamping plate are both fixed to the first mounting ring and the second mounting ring, and the fixed floating plate is fixedly installed between the first clamping plate and the second clamping plate.

[0008] A further improvement of the technical solution of the present invention is that the sealing floating plate is fixedly connected to one end of the fixed floating plate, a reinforcement ring is fixedly installed inside the fixed floating plate, and a mounting bolt is threadedly installed on the front surface of the first clamping plate, and the mounting bolt passes through the interior of the reinforcement ring.

[0009] A further improvement of the technical solution of the present invention is that a fixing plate is fixedly connected to one side of the backlash-eliminating piece, a fixing hole is opened on the top of the fixing plate, and the fixing plate is fixedly mounted on the bottom of the second mounting ring.

[0010] A further improvement of the technical solution of the present invention is that a reinforcing plate is fixedly connected to the bottom of the gap-eliminating plate, and the guide plate is fixedly connected between the gap-eliminating plate and the arc plate.

[0011] A further improvement of the technical solution of the present invention is that a docking hole is opened at one end of the adjusting rod, a screw is fixedly connected to one end of the adjusting rod, the docking tube is threadedly connected to one end of the screw, the fixing rod is fixedly connected to one end of the docking tube, one end of the screw is fixedly connected to a limiting plate, and a fixing pin is threadedly installed on one side of the docking tube.

[0012] A further improvement of the technical solution of the present invention is that the hot end guide assembly includes a hot end truss, connecting frames are fixedly installed on both sides of the hot end truss, and one end of the adjusting rod and the fixing rod are connected to the connecting frame by matching bolts.

[0013] A further improvement of the technical solution of the present invention is that a fixing frame is fixedly installed inside the hot end truss, a guide ring is fixedly installed inside the hot end truss, and a bearing guide hole is penetrated inside the guide ring.

[0014] A further improvement of the technical solution of the present invention is that: the first mounting ring and the second mounting ring are both fixedly connected to the inside of the outer frame guard plate, the first mounting ring is located at the top of the outer frame guard plate, and the second mounting ring is located at the bottom of the outer frame guard plate, a cold end truss is fixedly installed on the bottom of the outer frame guard plate, side sealing plates are fixedly installed on both ends of the cold end truss and the hot end truss, a side seat frame is fixedly installed on the outside of the outer frame guard plate, and a hot end primary air truss is fixedly installed on the top of the outer frame guard plate.

[0015] Due to the adoption of the above technical solution, the present invention has the following technical advances compared with the prior art:

[0016] 1. The present invention provides an air preheater high-efficiency sealing device. Through the joint action of the fixed floating plate, the reinforcement ring and the sealing floating plate, the fixed floating plate is fixed by the first clamping plate and the second clamping plate, and the sealing floating plate moves between the first clamping plate and the second clamping plate. The sealing floating plate and the first clamping plate and the second clamping plate can be separated and suspended. In the hot state, the sealing floating plate does not deform with the heat of the old rotor partition, and can maintain a constant and small sealing gap with the hot end fan plate. It is non-contact and non-wearing, and has a sealing gap adaptive self-compensation effect. The hot end can maintain a constant and small sealing gap with the fan plate, so that the air leakage rate is kept low for a long time. The reinforcement ring is an alloy hard structure that can reinforce the installation of the fixed floating plate to prevent the fixed floating plate from deforming at the fixed position, and can ensure that the sealing floating plate is suspended normally, thereby increasing the service life.

[0017] 2. The present invention provides an air preheater high-efficiency sealing device. Through the joint action of a reinforcement plate, an anti-gap sheet and a guide plate, a plurality of groups of anti-gap sheets and guide plates are installed on the cold end radial partition. The anti-gap sheets and guide plates block the leaked cold air, change the local flow field structure of the leakage area, and reduce the leakage pressure difference. The anti-gap sheet and the arc plate are separated by the guide plate to form a spoiler groove. The spoiler groove is a fixed structure and is not installed on the flue gas side, which reduces the leakage pressure difference and greatly solves the wear of the air preheater fan plate sealing sheet and the overall leakage problem, thereby greatly reducing the leakage rate of the air preheater, improving the boiler combustion efficiency and reducing energy consumption. The reinforcement plate is fixed at the bottom of the anti-gap sheet. The reinforcement plate can reinforce the anti-gap sheet to prevent the deformation of the anti-gap sheet from affecting the guide effect.

[0018] 3. The present invention provides an air preheater high-efficiency sealing device. Through the joint action of a screw, a butt tube and a fixing pin, the screw is threadedly connected to the butt tube. The overall length of the truss mounting assembly can be adjusted by rotating the screw to meet different installation requirements. At the same time, it is convenient for staff to disassemble and repair, which improves the convenience during use. The fixing pin is threadedly installed on one side of the butt tube. After the thread adjustment is completed, the screw can be fixed by tightening the fixing pin, which improves the convenience of screw adjustment and fixation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the air preheater high-efficiency sealing device of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the outer frame assembly of the present invention;

[0021] Figure 3 It is a structural schematic diagram of the hot end guide assembly of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the truss installation assembly of the present invention;

[0023] Figure 5It is a structural schematic diagram of the sealing assembly of the present invention;

[0024] Figure 6 It is a schematic structural diagram of the flow-blocking assembly of the present invention.

[0025] In the figure: 1, corner plate; 2, outer frame assembly; 21, outer frame guard plate; 22, side seat frame; 23, cold end truss; 24, lateral sealing plate; 25, hot end primary air truss; 26, first mounting ring; 27, second mounting ring; 3, hot end guide assembly; 31, hot end truss; 32, fixing frame; 33, connecting frame; 34, guide ring; 35, bearing guide hole; 4, sealing assembly; 41, first clamping plate; 42, Second clamping plate; 43. Mounting bolts; 44. Fixed floating plate; 45. Reinforcement ring; 46. Sealed floating plate; 5. Truss mounting assembly; 51. Adjusting rod; 52. Docking hole; 53. Screw; 54. Limiting plate; 55. Fixed rod; 56. Docking tube; 57. Fixed pin; 6. Flow blocking assembly; 61. Fixed plate; 62. Fixed hole; 63. Elimination plate; 64. Guide plate; 65. Arc plate; 66. Reinforcement plate. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with embodiments:

[0027] like Figure 1-6As shown, the present invention provides an air preheater high-efficiency sealing device, including a corner plate 1, an outer frame assembly 2, a hot end guide assembly 3, a sealing assembly 4, a baffle assembly 6 and a truss mounting assembly 5, the outer frame assembly 2 is fixedly mounted on the top of the corner plate 1, the outer frame assembly 2 includes an outer frame guard plate 21, a first mounting ring 26 and a second mounting ring 27, the baffle assembly 6 is fixedly mounted on the bottom of the second mounting ring 27, the baffle assembly 6 includes a gap eliminating sheet 63, a guide plate 64 and an arc plate 65, the truss mounting assembly 5 is fixedly mounted inside the outer frame guard plate 21, the truss mounting assembly 5 includes an adjusting rod 51, a butt pipe 56 and a fixing rod 55, and the sealing The sealing assembly 4 is fixedly mounted on the bottom of the first mounting ring 26 and the top of the second mounting ring 27 respectively. The sealing assembly 4 includes a first clamping plate 41, a second clamping plate 42, a fixed floating plate 44 and a sealing floating plate 46. The first clamping plate 41 and the second clamping plate 42 are both fixed to the first mounting ring 26 and the second mounting ring 27. The fixed floating plate 44 is fixedly mounted between the first clamping plate 41 and the second clamping plate 42. The sealing floating plate 46 is fixedly connected to one end of the fixed floating plate 44. The sealing floating plate 46 moves as a whole between the first clamping plate 41 and the second clamping plate 42. The sealing floating plate 46 can be separated from the first clamping plate 41 and the second clamping plate 42 and is in a suspended state. When hot, the sealing float plate 46 does not deform with the heat of the partition, and can maintain a constant and small sealing gap of the plate. It is non-contact and wear-free, and has an adaptive self-compensation effect for the sealing gap. A reinforcement ring 45 is fixedly installed inside the fixed float plate 44. The reinforcement ring 45 is an alloy hard structure that can reinforce the installation position of the fixed float plate 44 to prevent the fixed position of the fixed float plate 44 from deformation. It can ensure that the sealing float plate 46 is suspended normally, thereby increasing the service life. The front thread of the first clamping plate 41 is installed with a mounting bolt 43, and the mounting bolt 43 runs through the interior of the reinforcement ring 45.

[0028] like Figure 6 As shown, one side of the gap eliminating piece 63 is fixedly connected with a fixing plate 61, a fixing hole 62 is opened on the top of the fixing plate 61, the fixing plate 61 is fixedly installed on the bottom of the second mounting ring 27, and the bottom of the gap eliminating piece 63 is fixedly connected with a reinforcing plate 66, the reinforcing plate 66 can reinforce the gap eliminating piece 63 to prevent the gap eliminating piece 63 from deforming and affecting the guide effect, the guide plate 64 is fixedly connected between the gap eliminating piece 63 and the arc plate 65, the gap eliminating piece 63 and the arc plate 65 are separated by the guide plate 64 to form a spoiler groove, the spoiler groove is a fixed structure, and is not installed on the flue gas side, which reduces the air leakage pressure difference and greatly solves the wear of the air preheater sector plate sealing piece and the overall air leakage problem.

[0029] like Figure 2-4As shown, a docking hole 52 is provided at one end of the adjusting rod 51, and a screw 53 is fixedly connected to one end of the adjusting rod 51. By rotating the screw 53, the overall length of the truss installation assembly 5 can be adjusted to meet different installation requirements and facilitate disassembly and maintenance by the staff. The docking tube 56 is threadedly connected to one end of the screw 53, and the fixing rod 55 is fixedly connected to one end of the docking tube 56. One end of the screw 53 is fixedly connected to a limiting plate 54, and a fixing pin 57 is threadedly installed on one side of the docking tube 56. After the adjustment is completed, the screw 53 can be fixed by tightening the fixing pin 57, thereby improving the convenience of adjusting and fixing the screw 53. The hot end guide assembly 3 includes a hot end truss 31, and a connecting frame 33 is fixedly installed on both sides of the hot end truss 31. The adjusting rod 51 and the fixing pin 57 are fixedly installed on both sides of the hot end truss 31. One end of the fixed rod 55 is connected to the connecting frame 33 by an adaptive bolt, a fixing frame 32 is fixedly installed inside the hot end truss 31, a guide ring 34 is fixedly installed inside the hot end truss 31, a bearing guide hole 35 is penetrated inside the guide ring 34, the first mounting ring 26 and the second mounting ring 27 are fixedly connected to the inside of the outer frame guard plate 21, the first mounting ring 26 is located at the top of the outer frame guard plate 21, the second mounting ring 27 is located at the bottom of the outer frame guard plate 21, the cold end truss 23 is fixedly installed at the bottom of the outer frame guard plate 21, both ends of the cold end truss 23 and the hot end truss 31 are fixedly installed with lateral sealing plates 24, the outer side of the outer frame guard plate 21 is fixedly installed with a side seat frame 22, and the top of the outer frame guard plate 21 is fixedly installed with a hot end primary air truss 25.

[0030] The following is a detailed description of the working principle of the air preheater high-efficiency sealing device.

[0031] like Figure 1-6As shown, the fixed floating plate 44 of the present invention is fixed by the first clamping plate 41 and the second clamping plate 42, one end of the sealing floating plate 46 is fixed to the fixed floating plate 44, and the sealing floating plate 46 moves as a whole between the first clamping plate 41 and the second clamping plate 42. The sealing floating plate 46 and the first clamping plate 41 and the second clamping plate 42 can be separated and are in a suspended state. When hot, the sealing float 46 does not deform with the heat of the partition, and can maintain a constant and small sealing gap between the plates. It is non-contact and wear-free, and has an adaptive self-compensation effect for the sealing gap. The hot end can maintain a constant and small sealing gap with the fan plate, so that the air leakage rate can be kept low for a long time. The reinforcement ring 45 is fixed to the inside of the fixed float plate 44, and the mounting bolts 43 pass through the inside of the reinforcement ring 45 to fix the fixed float plate 44. The reinforcement ring 45 is an alloy hard structure that can reinforce the installation place of the fixed float plate 44 to prevent the fixed position of the fixed float plate 44 from deformation, and can ensure that the sealing float plate 46 hovers normally, thereby increasing the service life. The gap-eliminating sheet 63 and the guide plate 64 are installed at the cold end partition. The gap-eliminating sheet 63 and the guide plate 64 block the leaked cold air, change the local flow field structure of the leakage area, and reduce the leakage pressure difference. The gap-eliminating sheet 63 and the arc plate 65 are separated by the guide plate 64 to form a spoiler groove, and the spoiler groove is a fixed structure , it is not installed on the flue gas side, which reduces the air leakage pressure difference and greatly solves the wear of the air preheater fan plate sealing piece and the overall air leakage problem, thereby greatly reducing the air leakage rate of the air preheater, improving the boiler combustion efficiency and reducing energy consumption. The reinforcement plate 66 is fixed at the bottom of the gap-eliminating piece 63. The reinforcement plate 66 can reinforce the gap-eliminating piece 63 to prevent the gap-eliminating piece 63 from deforming and affecting the flow guidance effect. Both sides of the hot end truss 31 and the cold end truss 23 are fixed by the truss mounting assembly 5. The screw 53 is threadedly connected to the butt pipe 56. By rotating the screw 53, the overall length of the truss mounting assembly 5 can be adjusted to meet different installation requirements. At the same time, it is convenient for the staff to disassemble and repair, which improves the convenience of use. The fixing pin 57 is threadedly installed on one side of the butt pipe 56. After the thread adjustment is completed, the screw 53 can be fixed by tightening the fixing pin 57, which improves the convenience of adjusting and fixing the screw 53.

[0032] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. An air preheater high-efficiency sealing device, comprising a corner plate (1), an outer frame assembly (2), a hot end guide assembly (3), a sealing assembly (4), a flow blocking assembly (6) and a truss mounting assembly (5), characterized in that: The outer frame assembly (2) is fixedly mounted on the top of the corner plate (1), the outer frame assembly (2) comprises an outer frame guard plate (21), a first mounting ring (26) and a second mounting ring (27), the flow-blocking assembly (6) is fixedly mounted on the bottom of the second mounting ring (27), the flow-blocking assembly (6) comprises a gap-eliminating plate (63), a guide plate (64) and an arc plate (65), the truss mounting assembly (5) is fixedly mounted inside the outer frame guard plate (21), the truss mounting assembly (5) comprises an adjusting rod (51), a butt pipe (56) and a fixing rod (55), and the sealing assembly (4) is fixedly mounted on the bottom of the first mounting ring (26) and the top of the second mounting ring (27), respectively.

2. The high-efficiency sealing device for air preheater according to claim 1 is characterized in that: The sealing assembly (4) comprises a first clamping plate (41), a second clamping plate (42), a fixed floating plate (44) and a sealing floating plate (46); the first clamping plate (41) and the second clamping plate (42) are both fixed to a first mounting ring (26) and a second mounting ring (27); and the fixed floating plate (44) is fixedly mounted between the first clamping plate (41) and the second clamping plate (42).

3. The high-efficiency sealing device for air preheater according to claim 2 is characterized in that: The sealing floating plate (46) is fixedly connected to one end of the fixed floating plate (44), a reinforcing ring (45) is fixedly installed inside the fixed floating plate (44), and a mounting bolt (43) is threadedly installed on the front surface of the first clamping plate (41), and the mounting bolt (43) passes through the inside of the reinforcing ring (45).

4. The high-efficiency sealing device for air preheater according to claim 1 is characterized in that: A fixing plate (61) is fixedly connected to one side of the backlash-eliminating plate (63), a fixing hole (62) is provided on the top of the fixing plate (61), and the fixing plate (61) is fixedly mounted on the bottom of the second mounting ring (27).

5. The high-efficiency sealing device for air preheater according to claim 1 is characterized in that: A reinforcing plate (66) is fixedly connected to the bottom of the gap-eliminating plate (63), and the guide plate (64) is fixedly connected between the gap-eliminating plate (63) and the arc-shaped plate (65).

6. The high-efficiency sealing device for air preheater according to claim 1 is characterized in that: A docking hole (52) is provided at one end of the adjusting rod (51); a screw rod (53) is fixedly connected to one end of the adjusting rod (51); the docking tube (56) is threadedly connected to one end of the screw rod (53); the fixing rod (55) is fixedly connected to one end of the docking tube (56); one end of the screw rod (53) is fixedly connected to a limiting plate (54); and a fixing pin (57) is threadedly installed on one side of the docking tube (56).

7. The high-efficiency sealing device for air preheater according to claim 1, characterized in that: The hot end guide assembly (3) comprises a hot end truss (31), connecting frames (33) are fixedly mounted on both sides of the hot end truss (31), and one end of the adjusting rod (51) and the fixing rod (55) are connected to the connecting frame (33) via matching bolts.

8. The high-efficiency sealing device for air preheater according to claim 7, characterized in that: A fixing frame (32) is fixedly installed inside the hot end truss (31), a guide ring (34) is fixedly installed inside the hot end truss (31), and a bearing guide hole (35) is provided through the inside of the guide ring (34).

9. The high-efficiency sealing device for air preheater according to claim 1, characterized in that: The first mounting ring (26) and the second mounting ring (27) are both fixedly connected to the inside of the outer frame guard plate (21); the first mounting ring (26) is located at the top of the outer frame guard plate (21); the second mounting ring (27) is located at the bottom of the outer frame guard plate (21); a cold end truss (23) is fixedly installed at the bottom of the outer frame guard plate (21); both ends of the cold end truss (23) and the hot end truss (31) are fixedly installed with lateral sealing plates (24); a side seat frame (22) is fixedly installed on the outside of the outer frame guard plate (21); and a hot end primary air truss (25) is fixedly installed on the top of the outer frame guard plate (21).

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