Sealing device for rotary air preheater

Abstract

The invention discloses a rotary air preheater sealing device, relates to the technical field of rotary air preheater sealing, and is mainly used for solving the problems that a rotary air preheater is relatively high in air leakage rate and relatively low in heat transfer efficiency when a boiler is in low-load operation. The sealing device mainly comprises a shell, a spring, a partition plate, a steel ball, a lubricating oil spraying device, a sealing rolling shaft and the like, when the rotary air preheater operates, the spring ensures that the sealing rolling shaft is always tightly attached to a rotor, and the lubricating oil spraying device sprays lubricating oil to the sealing rolling shaft to further reduce a sealing gap; according to the rotary air preheater, the problems that the rotary air preheater is poor in sealing performance and low in efficiency during low-load operation of the boiler can be effectively solved, and the heat economy and safety of a boiler system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary air preheater sealing, in particular to a rotary air preheater sealing device. Background Art

[0002] The air preheater is an important component of a large boiler. Its main function is to use the waste heat carried by the flue gas itself to preheat the air before entering the boiler. The rotary air preheater is widely used due to its high heat transfer efficiency and compact structure. However, when the boiler is running at low load, the rotor of the rotary air preheater will undergo "mushroom-shaped" deformation and the sealing gap will increase, resulting in a significant increase in its air leakage rate and a decrease in boiler efficiency. Therefore, how to reduce air leakage in the air preheater is an important aspect of improving the thermal economy of the boiler. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a rotary air preheater sealing device, which is used to solve the problem of poor sealing performance of the air preheater sealing device and leakage between flue gas and air when the boiler is running at low load, thereby improving the thermal economy and safety of the boiler system.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A rotary air preheater sealing device includes a plurality of radial seal mounting holes 1000 defined within a primary air and secondary air fan-shaped plate 200 and a secondary air and flue gas fan-shaped plate 300 of a four-compartment rotary air preheater, radial seals 1200 mounted within the radial seal mounting holes 1000, and a plurality of axial seal mounting holes 1100 defined within an axial seal plate 400 of the four-compartment rotary air preheater, and axial seals 1300 mounted within the axial seal mounting holes 1100.

[0006] The radial seal 1200 includes a radial seal housing 1201, in which a radial seal roller 1206 is fixedly installed. A radial seal steel ball 1204 is disposed above the radial seal roller 1206. A radial seal partition 1203 is disposed above the radial seal steel ball 1204. The radial seal partition 1203 is connected to the radial seal housing 1201 via a radial seal spring 1202. A radial seal lubricating oil spraying device 1205 is fixedly installed on the side of the radial seal housing 1201 adjacent to the radial seal steel ball 1204.

[0007] The axial seal body 1300 includes an axial seal body shell 1301, an axial seal body sealing roller 1306 is fixedly installed inside the axial seal body shell 1301, an axial seal body steel ball 1304 is arranged above the axial seal body sealing roller 1306, an axial seal body partition 1303 is arranged above the axial seal body steel ball 1304, the axial seal body partition 1303 is connected to the axial seal body shell 1301 through an axial seal body spring 1302, and an axial seal body lubricating oil spraying device 1305 is fixedly installed on the side of the axial seal body shell 1301 adjacent to the axial seal body steel ball 1304.

[0008] Since the rotor of the rotary air preheater rotates slowly during operation, the radial sealing body 1200 and the axial sealing body 1300 are installed close to the rotor. The radial sealing body spring 1202 ensures that under different deformation conditions of the rotor, the radial sealing body sealing roller 1206 can always be close to the air preheater rotor, thereby reducing the radial air leakage gap and improving the sealing performance. Similarly, the axial sealing body spring 1302 ensures that under different deformation conditions of the rotor, the axial sealing body sealing roller 1306 can always be close to the air preheater rotor, thereby reducing the axial air leakage gap and improving the sealing performance.

[0009] The radial seal roller 1206 has a truncated cone-shaped structure and is equipped with radial seal steel balls 1204 of varying diameters in a size gradient, ensuring that the radial seal spacer 1203 positioned above the radial seal steel balls 1204 remains level. The advantage of the truncated cone-shaped structure of the radial seal roller 1206 is that it reduces the sealing gap caused by "mushroom-shaped" deformation and improves sealing performance.

[0010] The radial seal body lubricating oil spraying device 1205 sprays a preset amount of lubricating oil onto the radial seal body sealing roller 1206 to reduce the sealing gap and reduce wear.

[0011] The axial sealing body sealing roller 1306 is a cylindrical structure, and the diameter of the axial sealing body steel ball 1304 is the same. The advantage of the axial sealing body sealing roller 1306 being a cylindrical structure is that it reduces friction with the rotor and improves sealing performance.

[0012] The axial sealing body lubricating oil spraying device 1305 sprays a preset amount of lubricating oil onto the axial sealing body sealing roller 1306 to reduce the sealing gap and reduce wear.

[0013] The four-division-warehouse rotary air preheater comprises an air preheater shell 100, primary air and secondary air fan-shaped plates 200, secondary air and flue gas fan-shaped plates 300, axial sealing plates 400, an electric rotating shaft 500, secondary air air warehouse I 600, flue gas air warehouse 700, secondary air air warehouse II 800, primary air air warehouse 900, a radial sealing body mounting hole 1000, an axial sealing body mounting hole 1100, a radial sealing body 1200 and an axial sealing body 1300.

[0014] In the air preheater shell 100, four fan-shaped plates connected with the electric rotating shaft 500, i.e., two adjacent primary air and secondary air fan-shaped plates 200 and two adjacent secondary air and flue gas fan-shaped plates 300, are arranged in the air preheater shell 100 at intervals of 90 degrees in sequence, so that the air preheater is divided into four warehouses, thereby forming a four-division-warehouse rotary air preheater.

[0015] Among them, the area surrounded by the primary air and secondary air fan-shaped plates 200 and the secondary air and flue gas fan-shaped plates 300 is the secondary air air warehouse I 600, the area surrounded by the two adjacent secondary air and flue gas fan-shaped plates 300 is the flue gas air warehouse 700, the area surrounded by the secondary air and flue gas fan-shaped plates 300 and the primary air and secondary air fan-shaped plates 200 is the secondary air air warehouse II 800, and the area surrounded by the two adjacent primary air and secondary air fan-shaped plates 200 is the primary air air warehouse 900.

[0016] Preferably, the sealing device is mounted to closely adhere to the air preheater rotor, so as to reduce the sealing gap and improve the sealing performance.

[0017] The sealing device mainly solves the problems of high air leakage rate and low heat transfer efficiency of the rotary air preheater when the boiler is operated at low load, and has the following advantages compared with the prior art.

[0018] (1) The rotary air preheater sealing device, the spring structure ensures that the sealing roller always closely adheres to the air preheater rotor under different deformations, so that the application range is wider, different working environments can be flexibly coped with, higher level of sealing performance is ensured, the air leakage rate is reduced, and the efficiency of the air preheater is improved.

[0019] (2) The rotary air preheater sealing device, by spraying lubricating oil to the sealing roller, the gap between the sealing roller and the rotor is further reduced, the sealing performance of the device is improved, the friction loss is reduced, the service life of the sealing body is prolonged, thereby the maintenance frequency and operation cost are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic view of the four-division-warehouse rotary air preheater of the present application.

[0021] Figure 1Middle: 100—air preheater shell, 200—primary air and secondary air fan-shaped plate, 300—secondary air and flue gas fan-shaped plate, 400—axial sealing plate, 500—electric rotating shaft, 600—secondary air silo I, 700—flue gas silo, 800—secondary air silo II, 900—primary air silo, 1000—radial sealing body installation hole, 1100—axial sealing body installation hole.

[0022] Figure 2 This is a schematic diagram of the radial sealing body of the rotary air preheater of the present invention;

[0023] Figure 2 In the figure: 1200—radial seal body, 1201—radial seal body housing, 1202—radial seal body spring, 1203—radial seal body partition, 1204—radial seal body steel ball, 1205—radial seal body lubricating oil spraying device, 1206—radial seal body sealing roller.

[0024] Figure 3 This is a schematic diagram of the axial sealing body of the rotary air preheater of the present invention;

[0025] Figure 3 In the figure: 1300—axial sealing body, 1301—axial sealing body housing, 1302—axial sealing body spring, 1303—axial sealing body partition, 1304—axial sealing body steel ball, 1305—axial sealing body lubricating oil spraying device, 1306—axial sealing body sealing roller. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a rotary air preheater sealing device, such as Figure 1 As shown, the four-compartment rotary air preheater comprises an air preheater shell 100, a primary air and secondary air baffle 200, a secondary air and flue gas baffle 300, an axial sealing plate 400, an electric rotating shaft 500, a secondary air chamber I 600, a flue gas chamber 700, a secondary air chamber II 800, a primary air chamber 900, a radial sealing body mounting hole 1000, an axial sealing body mounting hole 1100, a radial sealing body 1200, and an axial sealing body 1300; in the air preheater shell (100), four fan-shaped plates connected to the electric rotating shaft (500), i.e., two adjacent primary air and secondary air fan-shaped plates (200) and two adjacent secondary air and flue gas fan-shaped plates (300), are sequentially arranged at intervals of 90 degrees in the air preheater shell (100), dividing the air preheater into four chambers, thus forming a four-compartment rotary air preheater;

[0028] The area surrounded by the primary air and secondary air fan-shaped plate (200) and the secondary air and flue gas fan-shaped plate (300) is a secondary air wind warehouse I (600), the area surrounded by the adjacent two secondary air and flue gas fan-shaped plates (300) is a flue gas wind warehouse (700), the area surrounded by the secondary air and flue gas fan-shaped plate (300) and the primary air and secondary air fan-shaped plate (200) is a secondary air wind warehouse II (800), and the area surrounded by the adjacent two primary air and secondary air fan-shaped plates (200) is a primary air wind warehouse (900).

[0029] As shown in Figure 2 The radial sealing body 1200 is composed of a radial sealing body shell 1201, a radial sealing body spring 1202, a radial sealing body partition plate 1203, a radial sealing body steel ball 1204, a radial sealing body lubricating oil spraying device 1205 and a radial sealing body sealing roller 1206. The radial sealing body sealing roller 1206 is fixedly installed in the radial sealing body shell 1201, the radial sealing body steel ball 1204 is arranged above the radial sealing body sealing roller 1206, the radial sealing body partition plate 1203 is arranged above the radial sealing body steel ball 1204, the radial sealing body partition plate 1203 is connected with the radial sealing body shell 1201 through the radial sealing body spring 1202, and the radial sealing body lubricating oil spraying device 1205 is fixedly installed on the side of the radial sealing body shell 1201 close to the axial sealing body steel ball 1304. The radial sealing body 1200 is installed in the radial sealing body installation hole 1000 arranged in the primary air and secondary air fan-shaped plate 200 and the secondary air and flue gas fan-shaped plate 300. The radial sealing body sealing roller 1206 is arranged in a circular truncated cone structure, and the radial sealing body steel ball 1204 with different diameters is arranged according to the size gradient. The radial sealing body partition plate 1203 arranged on the radial sealing body steel ball 1204 is always kept horizontal. Since the rotating speed of the rotor of the rotary air preheater is slow, the radial sealing body 1200 is installed close to the rotor, and the radial sealing body spring 1202 ensures that the radial sealing body sealing roller 1206 is always close to the air preheater rotor under different deformation conditions of the rotor, so as to reduce the radial air leakage gap.

[0030] As shown in Figure 3As shown, the axial seal body 1300 is composed of an axial seal body housing 1301, an axial seal body spring 1302, an axial seal body partition 1303, an axial seal body steel ball 1304, an axial seal body lubricating oil spraying device 1305, and an axial seal body sealing roller 1306. An axial sealing body sealing roller 1306 is fixedly installed inside the axial sealing body shell 1301, an axial sealing body steel ball 1304 is arranged above the axial sealing body sealing roller 1306, an axial sealing body partition 1303 is arranged above the axial sealing body steel ball, the axial sealing body partition 1303 is connected to the axial sealing body shell 1301 through an axial sealing body spring 1302, and an axial sealing body lubricating oil spraying device 1305 is fixedly installed on the side of the axial sealing body shell 1301; the axial sealing body 1300 is installed in a plurality of axial sealing body installation holes 1100 inside the axial sealing plate of the air preheater, and the matching axial sealing body sealing roller 1306 is set to a cylindrical structure and is equipped with axial sealing body steel balls 1304 of the same diameter according to a size gradient. Similarly, since the rotor rotation speed of the rotary air preheater is slow during operation, the axial sealing body is installed close to the rotor to reduce the axial air leakage gap;

[0031] The radial seal body lubricating oil spraying device 1205 and the axial seal body lubricating oil spraying device 1305 spray appropriate amounts of lubricating oil onto the radial seal body sealing roller 1206 and the axial seal body sealing roller 1306 respectively, further reducing the sealing gap between the sealing roller and the rotor, while reducing friction loss and extending the service life of the seal body.

Claims

1. A rotary air preheater sealing device, characterized in that: The invention comprises a plurality of radial seal body installation holes (1000) opened inside a primary air and secondary fan-shaped plate (200) and a secondary air and flue gas fan-shaped plate (300) of a four-compartment rotary air preheater, a radial seal body (1200) installed in the radial seal body installation holes (1000), and a plurality of axial seal body installation holes (1100) opened inside an axial seal plate (400) of the four-compartment rotary air preheater, and an axial seal body (1300) installed in the axial seal body installation holes (1100). The radial seal (1200) comprises a radial seal housing (1201), a radial seal roller (1206) fixedly mounted inside the radial seal housing (1201), a radial seal steel ball (1204) disposed above the radial seal roller (1206), a radial seal partition (1203) disposed above the radial seal steel ball (1204), the radial seal partition (1203) being connected to the radial seal housing (1201) via a radial seal spring (1202), and a radial seal lubricating oil spraying device (1205) fixedly mounted on the side of the radial seal housing (1201) adjacent to the radial seal steel ball (1204); The axial seal body (1300) comprises an axial seal body housing (1301), an axial seal body sealing roller (1306) is fixedly installed inside the axial seal body housing (1301), an axial seal body steel ball (1304) is arranged above the axial seal body sealing roller (1306), an axial seal body partition (1303) is arranged above the axial seal body steel ball (1304), the axial seal body partition (1303) is connected to the axial seal body housing (1301) via an axial seal body spring (1302), and an axial seal body lubricating oil spraying device (1305) is fixedly installed on the side of the axial seal body housing (1301) adjacent to the axial seal body steel ball (1304).

2. A rotary air preheater sealing device according to claim 1, characterized in that: The radial sealing body (1200) and the axial sealing body (1300) are installed close to the rotor, and the radial sealing body spring (1202) ensures that under different deformation conditions of the rotor, the radial sealing body sealing roller (1206) can always be close to the air preheater rotor, thereby reducing the radial air leakage gap; similarly, the axial sealing body spring (1302) ensures that under different deformation conditions of the rotor, the axial sealing body sealing roller (1306) can always be close to the air preheater rotor, thereby reducing the axial air leakage gap.

3. The rotary air preheater sealing device according to claim 1, characterized in that: The radial sealing body sealing roller (1206) is a truncated cone structure and is equipped with radial sealing body steel balls (1204) of different diameters according to a size gradient, ensuring that the radial sealing body partition (1203) located on the radial sealing body steel balls (1204) always remains horizontal.

4. The rotary air preheater sealing device according to claim 1, characterized in that: The radial sealing body lubricating oil spraying device (1205) sprays a preset amount of lubricating oil onto the radial sealing body sealing roller (1206) to reduce the sealing gap and reduce wear.

5. The rotary air preheater sealing device according to claim 1, characterized in that: The axial sealing body sealing roller (1306) is a cylindrical structure, and the axial sealing body steel balls (1304) are of the same diameter.

6. The rotary air preheater sealing device according to claim 1, characterized in that: The axial sealing body lubricating oil spraying device (1305) sprays a preset amount of lubricating oil onto the axial sealing body sealing roller (1306) to reduce the sealing gap and reduce wear.

7. The rotary air preheater sealing device according to claim 1, characterized in that: The four-compartment rotary air preheater comprises an air preheater housing (100), a primary air and secondary air fan-shaped plate (200), a secondary air and flue gas fan-shaped plate (300), an axial sealing plate (400), an electric rotating shaft (500), a secondary air chamber I (600), a flue gas chamber (700), a secondary air chamber II (800), a primary air chamber (900), a radial sealing body mounting hole (1000), an axial sealing body mounting hole (1100), a radial sealing body (1200), and an axial sealing body (1300); In the air preheater housing (100), four fan-shaped plates connected to the electric rotating shaft (500), namely, two adjacent primary air and secondary air fan-shaped plates (200) and two adjacent secondary air and flue gas fan-shaped plates (300), are sequentially arranged at intervals of 90 degrees in the air preheater housing (100), dividing the air preheater into four compartments, forming a four-compartment rotary air preheater; The area enclosed by the primary and secondary fan-shaped plates (200) and the secondary and smoke fan-shaped plates (300) is the secondary air bunker I (600), the area enclosed by two adjacent secondary and smoke fan-shaped plates (300) is the smoke bunker (700), the area enclosed by the secondary and smoke fan-shaped plates (300) and the primary and secondary fan-shaped plates (200) is the secondary air bunker II (800), and the area enclosed by two adjacent primary and secondary fan-shaped plates (200) is the primary air bunker (900).

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