Novel rotary air pre-heater sealing structure based on Tesla valve

Abstract

The utility model discloses a novel rotary air pre-heater sealing structure based on a Tesla valve in the field of safety and energy conservation of boiler equipment, the novel rotary air pre-heater sealing structure comprises a fan-shaped plate, a sealing structure, a plurality of radial sealing pieces and a fan-shaped bin vertical plate, the sealing structure comprises a fixing plate, a plurality of flow guide plates and a connecting block, the top end of the fixing plate is connected with the fan-shaped plate, and the top end of the fixing plate is connected with the fan-shaped plate; a plurality of grooves are formed in the bottom end of the fixing plate, the flow guide plates are connected into the grooves through the connecting blocks respectively, gaps are reserved between the flow guide plates and the grooves and serve as flow guide channels, the bottom ends of the radial sealing pieces are connected to the top ends of the fan-shaped bin vertical plates, and the fan-shaped bin vertical plates are arranged at the bottom of the fixing plate and are perpendicular to the grooves. The special structure of the Tesla valve is adopted, the Tesla valve is combined with the air pre-heater, the effect of preventing air from quickly passing through is achieved, the air can flow back for multiple times, the air flow speed is reduced, meanwhile, leakage of high-pressure air is reduced, and the air volume loss is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary air preheater construction in thermal power plants, and in particular to a novel rotary air preheater sealing structure based on a Tesla valve. Background Art

[0002] The rotary air preheater transfers heat in a regenerative manner, with flue gas and air flowing alternately over the heating surface. When the flue gas flows through, the heat is transferred from the flue gas to the heating surface, the temperature of the heating surface rises, and the heat is accumulated; when the air flows through again, the heating surface releases the accumulated heat to the air. During the operation of the rotary air preheater in a thermal power plant, air leakage occurs due to the pressure difference between the flue gas and the air, and the sealing gap between the sealing sheet and the fan plate and arc plate bracket, resulting in energy loss. Therefore, the sealing technology and sealing structure of the air preheater are the key technologies of each air preheater.

[0003] Prior art, for example, a patent with announcement number "CN205748089U" discloses a fully enclosed elastic sealing device for an air preheater, including a seat plate, an elastic element and a sealing plate, characterized in that the elastic element includes more than two overlapping sections of corrugated plates, one end of two adjacent sections of corrugated plates is connected and fixedly connected to a U-shaped plate on the outside of the end, the corrugated plate located on one side edge is connected to one end of the sealing plate and fixedly connected to the U-shaped plate on the outside of the end, one section of the sealing plate is inclined, and the corrugated plate located on the other side edge is connected to one end of the seat plate; a bent front dustproof plate and a rear dustproof plate are fixedly connected on both sides of the seat plate, and the front dustproof plate, the rear dustproof plate and the corrugated plate connected to the sealing plate surround the remaining corrugated plates. The above existing patents adopt a layout of multiple corrugated plates, and the seal is connected to the elastic element as a whole, so that the deformation of the sealing structure is small, and the seal is prevented from falling off and getting stuck. However, in a normal working environment, due to the large difference in air pressure between the air inlet and outlet ends, the gap in the sealing structure will be impacted by the high-pressure gas. The gap cannot withstand the continuous impact of the high-pressure gas, causing leakage of the high-pressure gas, which in turn causes air volume loss. Utility Model Content

[0004] The utility model aims to provide a novel rotary air preheater sealing structure based on a Tesla valve, so as to solve the problem of air leakage in the rotary air preheater and energy loss.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a new rotary air preheater sealing structure based on a Tesla valve, comprising a fan-shaped plate, a sealing structure, a plurality of radial sealing sheets and a fan-shaped bin plate, the sealing structure comprising a fixed plate, a plurality of guide plates and a connecting block, the top of the fixed plate is connected to the fan-shaped plate, the bottom end of the fixed plate is provided with a plurality of grooves, the plurality of guide plates are respectively connected to the grooves through connecting blocks, a gap is left between the guide plate and the groove, the gap is a guide channel, the bottom end of the radial sealing sheet is connected to the top of the fan-shaped bin plate, the plurality of fan-shaped bin plates are arranged at the bottom of the fixed plate and perpendicular to the grooves.

[0006] The working principle of the utility model is as follows: the sealing structure is installed in the rotary air preheater, and the high-pressure gas passes through the gap between the mirror sealing sheet and the fixed plate. At this time, a part of the high-pressure gas passes through the guide channel of the guide plate and the groove, and finally falls back to the original gap. At this time, the high-pressure gas reduces a part of the air pressure through the guide plate, and the high-pressure gas coming out of the guide plate blocks the high-pressure gas operating in the original gap, reduces the flow rate of the gas in the sealing structure, and makes the increased air pressure at the outlet end tend to be balanced with the inlet section, thereby reducing the air leakage.

[0007] Beneficial effects of the utility model: When the rotary air preheater is running, the following two states exist at the same time:

[0008] 1) In the flow guide channel between the two radial sealing sheets, the pressure difference on both sides is the same, so the new seal does not work.

[0009] 2) When the inlet and outlet of the guide channel are located at the two ends of the radial sealing plate, the high-pressure airflow on both sides of the radial sealing plate is conducted to the low-pressure side through the new sealing structure and changes the flow direction to form a backflow, thereby increasing the pressure at the sealing gap on the low-pressure side and reducing the pressure difference at both ends of the radial seal, thereby reducing the leakage of high-pressure air and reducing the air volume loss.

[0010] Furthermore, a plurality of connecting plates are connected between the fan-shaped plate and the fixed plate, and through holes are provided at both ends of the connecting plates, and the two ends of the connecting plates are respectively connected to the fan-shaped plate and the fixed plate by bolts. Through the provision of the connecting plates, the fan-shaped plate and the fixed plate can be disassembled from each other, which is convenient for subsequent inspection and maintenance.

[0011] Furthermore, the guide plate is in the shape of a water drop column. The setting of the guide plate in the shape of a water drop column enables the high-pressure air to be buffered to the maximum extent in the guide channel. When the high-pressure gas comes out of the guide channel, due to the shape of the guide plate, the movement direction of the high-pressure gas is opposite to the original movement, which further buffers the high-pressure gas.

[0012] Furthermore, the gaps between the guide plate and the groove are the same. By setting the gaps to be the same, the high-pressure gas can pass through the guide channel evenly without squeezing the guide plate.

[0013] Furthermore, one end of the guide plate water droplet head is an air inlet end. By defining the air inlet end, high-pressure gas can enter the guide channel faster.

[0014] Furthermore, the free end of the radial sealing sheet is located directly below the center of the guide plate. By limiting the position of the radial sealing sheet, the high-pressure gas passing through the guide channel can move in the reverse direction for a certain distance after flowing out. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a three-dimensional schematic diagram of a new rotary air preheater sealing structure based on a Tesla valve in the utility model;

[0016] Figure 2 This is a front view of a new rotary air preheater sealing structure based on a Tesla valve in the utility model;

[0017] Figure 3 This is a side view of a new rotary air preheater sealing structure based on a Tesla valve in the utility model;

[0018] Figure 4 This is a bottom view of a new rotary air preheater sealing structure based on a Tesla valve according to the utility model. DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The reference numerals in the drawings of the specification include: sector plate 1, sealing structure 2, fixing plate 21, guide plate 22, connecting block 23, guide channel 24, radial sealing sheet 3, sector bin vertical plate 4, connecting plate 5, bolt 6.

[0021] The embodiment is basically as shown in the attached Figure 1 -Attached Figure 4 As shown: a new rotary air preheater sealing structure 2 based on Tesla valve, including a fan-shaped plate 1, a sealing structure 2, three radial sealing sheets 3 and a fan-shaped bin plate 4, the sealing structure 2 includes a fixed plate 21 and three guide plates 22, the top of the fixed plate 21 is detachably connected to the fan-shaped plate 1 through three connecting plates 5, both ends of the connecting plate 5 are provided with through holes, the two ends of the connecting plate 5 are detachably connected to the fan-shaped plate 1 and the fixed plate 21 respectively through bolts 6, the bottom end of the fixed plate 21 is provided with three grooves, the guide plate 22 is a water drop column, the three guide plates 22 are fixedly connected in the grooves by connecting blocks 23, a gap is left between the guide plate 22 and the groove, the gap is a guide channel 24, the spacing of the guide channels 24 is the same, the bottom end of the radial sealing sheet 3 is fixedly connected to the top of the fan-shaped bin plate 4, the three fan-shaped bin plates 4 are arranged at the bottom of the fixed plate 21 and are perpendicular to the groove, and the free end of the radial sealing sheet 3 is located directly below the center of the guide plate 22.

[0022] The specific implementation process is as follows: the sealing structure 2 is installed in the rotary air preheater. At this time, the high-pressure gas passes through the gap between the mirror sealing plate and the fixed plate 21. At this time, a part of the high-pressure gas passes through the guide channel 24 of the guide plate 22 and the groove. When the high-pressure gas comes out of the guide channel 24, due to the shape of the guide plate 22, the movement direction of the high-pressure gas is opposite to the original movement, which further buffers the high-pressure gas. At this time, the high-pressure gas passes through the guide plate 22 to reduce part of the air pressure. The high-pressure gas coming out of the guide plate 22 blocks the high-pressure gas running in the original gap, reduces the flow rate of the gas in the sealing structure 2, and makes the pressure increase at the outlet end tend to be balanced with the inlet section, thereby reducing the air leakage.

[0023] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A new rotary air preheater sealing structure based on Tesla valve, characterized by: It includes a fan-shaped plate, a sealing structure, multiple radial sealing sheets and a fan-shaped bin plate. The sealing structure includes a fixed plate, multiple guide plates and a connecting block. The top end of the fixed plate is connected to the fan-shaped plate. The bottom end of the fixed plate is provided with multiple grooves. The multiple guide plates are respectively connected in the grooves through the connecting blocks. A gap is left between the guide plate and the groove. The gap is a guide channel. The bottom end of the radial sealing sheet is connected to the top end of the fan-shaped bin plate. The multiple fan-shaped bin plates are arranged at the bottom of the fixed plate and are perpendicular to the grooves.

2. According to the new rotary air preheater sealing structure based on Tesla valve according to claim 1, it is characterized by: A plurality of connecting plates are connected between the sector plate and the fixed plate, both ends of the connecting plates are provided with through holes, and the two ends of the connecting plates are respectively connected to the sector plate and the fixed plate by bolts.

3. According to the new rotary air preheater sealing structure based on Tesla valve according to claim 2, it is characterized by: The guide plate is in the shape of a water drop column.

4. According to claim 3, a new rotary air preheater sealing structure based on a Tesla valve is characterized in that: The gaps between the guide plates and the grooves are the same.

5. According to claim 4, a new rotary air preheater sealing structure based on a Tesla valve is characterized in that: One end of the guide plate water drop head is an air inlet end.

6. The novel rotary air preheater sealing structure based on Tesla valve according to claim 5 is characterized in that: The free end of the radial sealing sheet is located directly below the center of the guide plate.

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