A rotary air preheater sealing device

Abstract

The application discloses a rotary air preheater sealing device, relates to the technical field of rotary air preheater sealing, and mainly aims to solve the problems of high air leakage rate and low heat transfer efficiency of a rotary air preheater 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 and a sealing roller and the like, when the rotary air preheater is in operation, the spring ensures that the sealing roller is always close to a rotor, the lubricating oil spraying device sprays lubricating oil to the sealing roller, the sealing gap is further reduced, and the friction loss between the sealing part and the rotor is reduced; the application can effectively reduce the problems of poor sealing performance and low efficiency of the rotary air preheater when the boiler is in low-load operation, and improve the thermal economy and safety of the boiler system.

Description

Technical Field

[0001] This invention relates to the field of rotary air preheater sealing technology, and in particular to a rotary air preheater sealing device. Background Technology

[0002] Air preheaters are important components of large boilers. Their main function is to preheat the air entering the boiler by utilizing the waste heat carried by the flue gas itself. Rotary air preheaters are widely used due to their high heat transfer efficiency and compact structure. However, when the boiler is running at low load, the rotor of the rotary air preheater will deform into a "mushroom shape", increasing the sealing gap and leading to a significant increase in air leakage rate and a decrease in boiler efficiency. Therefore, reducing 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 present invention aims to provide a rotary air preheater sealing device 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] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A rotary air preheater sealing device includes multiple radial sealing body mounting holes 1000 opened inside the primary air and secondary air fan-shaped plate 200 and the secondary air and flue gas fan-shaped plate 300 of the four-compartment rotary air preheater, radial sealing bodies 1200 installed in the radial sealing body mounting holes 1000, and multiple axial sealing body mounting holes 1100 opened inside the axial sealing plate 400 of the four-compartment rotary air preheater, and axial sealing bodies 1300 installed in the axial sealing body mounting holes 1100.

[0006] The radial seal 1200 includes a radial seal housing 1201, a radial seal roller 1206 fixedly installed inside the radial seal housing 1201, a radial seal steel ball 1204 arranged above the radial seal roller 1206, a radial seal partition 1203 arranged above the radial seal steel ball 1204, the radial seal partition 1203 is connected to the radial seal housing 1201 through a radial seal spring 1202, and 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 1300 includes an axial seal housing 1301, an axial seal sealing roller 1306 fixedly installed inside the axial seal housing 1301, an axial seal steel ball 1304 disposed above the axial seal steel ball 1304, an axial seal partition 1303 disposed above the axial seal steel ball 1304, the axial seal partition 1303 is connected to the axial seal housing 1301 through an axial seal spring 1302, and an axial seal lubricating oil spraying device 1305 is fixedly installed on the side of the axial seal housing 1301 adjacent to the axial seal steel ball 1304.

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

[0009] The radial sealing roller 1206 has a frustum-shaped structure, and radial sealing steel balls 1204 of different diameters are arranged according to size gradients to ensure that the radial sealing partition 1203 located on the radial sealing steel balls 1204 always remains horizontal. The advantage of the frustum-shaped structure of the radial sealing roller 1206 is that it reduces the sealing gap caused by the "mushroom-shaped" deformation and improves the sealing performance.

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

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

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

[0013] The four-compartment rotary air preheater includes an air preheater shell 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 air chamber 700, a secondary air chamber II 800, a primary air chamber 900, a radial sealing body mounting cavity 1000, an axial sealing body mounting cavity 1100, a radial sealing body 1200, and an axial sealing body 1300.

[0014] Inside 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 arranged at 90-degree intervals in sequence inside the air preheater housing 100, dividing the air preheater into four compartments, becoming a four-compartment rotary air preheater.

[0015] The area enclosed by the primary air fan and the secondary air fan-shaped plate 200 and the secondary air fan and the flue gas fan-shaped plate 300 is the secondary air chamber I 600; the area enclosed by two adjacent secondary air fans and the flue gas fan-shaped plate 300 is the flue gas chamber 700; the area enclosed by the secondary air fans and the flue gas fan-shaped plate 300 and the primary air fan and the secondary air fan-shaped plate 200 is the secondary air chamber II 800; and the area enclosed by two adjacent primary air fans and the secondary air fan-shaped plate 200 is the primary air chamber 900.

[0016] Preferably, the sealing device is installed close to the air preheater rotor to reduce the sealing gap and improve sealing performance.

[0017] The sealing device of this invention is mainly used to solve the problems of high air leakage rate and low heat transfer efficiency of rotary air preheaters when boilers are running at low loads. Compared with the prior art, this invention has the following advantages:

[0018] (1) The rotary air preheater sealing device has a spring structure that ensures that the sealing roller always sticks to the air preheater rotor under different deformations, making it more applicable and able to flexibly cope with different working environments, ensuring a higher level of sealing performance, reducing air leakage rate, and improving the efficiency of the air preheater.

[0019] (2) The rotary air preheater sealing device further reduces the gap between the sealing roller and the rotor by spraying lubricating oil onto the sealing roller, which improves the sealing performance of the device, reduces friction loss, extends the service life of the sealing body, and thus reduces maintenance frequency and operating costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the four-compartment rotary air preheater of the present invention;

[0021] Figure 1In the middle: 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 chamber I, 700—Flue gas chamber, 800—Secondary air chamber II, 900—Primary air chamber, 1000—Radial sealing body mounting cavity, 1100—Axial sealing body mounting cavity.

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

[0023] Figure 2 In the middle: 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 seal of the rotary air preheater of the present invention;

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

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

[0027] This invention provides a rotary air preheater sealing device, such as... Figure 1 As shown, the four-compartment rotary air preheater includes an air preheater shell 100, primary and secondary air baffles 200, secondary air and flue gas baffles 300, axial sealing plate 400, electric rotating shaft 500, secondary air chamber I 600, flue gas chamber 700, secondary air chamber II 800, primary air chamber 900, radial sealing body mounting cavity 1000, axial sealing body mounting cavity 1100, radial sealing body 1200, and axial sealing body 1300. Inside the air preheater shell (100), four fan-shaped plates connected to the electric rotating shaft (500), namely two adjacent primary and secondary air fan-shaped plates (200) and two adjacent secondary air and flue gas fan-shaped plates (300), are arranged at 90-degree intervals inside the air preheater shell (100), dividing the air preheater into four compartments, thus forming a four-compartment rotary air preheater.

[0028] Among them, the area enclosed by the primary air and secondary air fan-shaped plate (200) and the secondary air and flue gas fan-shaped plate (300) is the secondary air chamber I (600), the area enclosed by two adjacent secondary air and flue gas fan-shaped plates (300) is the flue gas chamber (700), the area enclosed by the secondary air and flue gas fan-shaped plate (300) and the primary air and secondary air fan-shaped plate (200) is the secondary air chamber II (800), and the area enclosed by two adjacent primary air and secondary air fan-shaped plates (200) is the primary air chamber (900); multiple radial sealing body installation holes (1000) are opened inside the primary air and secondary air fan-shaped plate (200) and the secondary air and flue gas fan-shaped plate (300), and multiple axial sealing body installation holes (1100) are opened inside the axial sealing plate (400).

[0029] like Figure 2 As shown, the radial seal 1200 consists of a radial seal housing 1201, a radial seal spring 1202, a radial seal partition 1203, a radial seal steel ball 1204, a radial seal lubricating oil spraying device 1205, and a radial seal sealing roller 1206. The radial seal roller 1206 is fixedly installed inside the radial seal housing 1201. A radial seal steel ball 1204 is positioned above the radial seal roller 1206, and a radial seal partition 1203 is positioned above the radial seal steel ball 1204. The radial seal partition 1203 is connected to the radial seal housing 1201 via the radial seal spring 1202. A radial seal is fixedly installed on the side of the radial seal housing 1201 adjacent to the axial seal steel ball 1204. Lubricating oil spraying device 1205; Radial seal 1200 is installed in multiple radial seal mounting holes 1000 located inside the primary air and secondary air fan-shaped plate 200 and the secondary air and flue gas fan-shaped plate 300. The matching radial seal sealing roller 1206 is set as a frustum structure, and radial seal steel balls 1204 of different diameters are equipped according to the size gradient to ensure that the radial seal partition 1203 on the radial seal steel ball 1204 always remains horizontal. Since the rotor rotation speed of the rotary air preheater is relatively slow during operation, the radial seal 1200 is installed close to the rotor. The radial seal spring 1202 ensures that the radial seal sealing roller 1206 can always be close to the air preheater rotor under different rotor deformation conditions, reducing the radial air leakage gap.

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

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

Claims

1. A rotary air preheater sealing device, characterized in that, The four-compartment rotary air preheater includes multiple radial sealing body mounting holes (1000) opened inside the primary and secondary air fan-shaped plates (200) and the secondary air and flue gas fan-shaped plates (300), radial sealing bodies (1200) installed in the radial sealing body mounting holes (1000), and multiple axial sealing body mounting holes (1100) opened inside the axial sealing plate (400) of the four-compartment rotary air preheater, axial sealing bodies (1300) installed in the axial sealing body mounting holes (1100). The radial seal (1200) includes a radial seal housing (1201), a radial seal roller (1206) is fixedly installed inside the radial seal housing (1201), a radial seal steel ball (1204) is arranged above the radial seal roller (1206), a radial seal partition (1203) is arranged above the radial seal steel ball (1204), the radial seal partition (1203) is connected to the radial seal housing (1201) through a radial seal spring (1202), and a radial seal lubricating oil spraying device (1205) is fixedly installed on the side of the radial seal housing (1201) near the radial seal steel ball (1204); The axial seal (1300) includes an axial seal housing (1301), an axial seal roller (1306) is fixedly installed inside the axial seal housing (1301), an axial seal steel ball (1304) is arranged above the axial seal roller (1306), an axial seal partition (1303) is arranged above the axial seal steel ball (1304), the axial seal partition (1303) is connected to the axial seal housing (1301) through an axial seal spring (1302), and an axial seal lubricating oil spraying device (1305) is fixedly installed on the side of the axial seal housing (1301) near the axial seal steel ball (1304). The radial sealing body sealing roller (1206) has a frustum-shaped structure and is equipped with radial sealing body steel balls (1204) of different diameters according to the size gradient, so as to ensure that the radial sealing body partition (1203) located on the radial sealing body steel ball (1204) always remains horizontal.

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

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

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

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

6. A rotary air preheater sealing device according to claim 1, characterized in that, The four-compartment rotary air preheater includes an air preheater shell (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 air chamber (700), a secondary air chamber II (800), a primary air chamber (900), a radial sealing body mounting cavity (1000), an axial sealing body mounting cavity (1100), a radial sealing body (1200), and an axial sealing body (1300). Inside 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 arranged at 90-degree intervals in sequence inside the air preheater housing (100), dividing the air preheater into four compartments, becoming a four-compartment rotary air preheater; The area enclosed by the primary air fan and the secondary air fan-shaped plate (200) and the secondary air fan and the flue gas fan-shaped plate (300) is the secondary air chamber I (600), the area enclosed by two adjacent secondary air fan and flue gas fan-shaped plates (300) is the flue gas chamber (700), the area enclosed by the secondary air fan and the flue gas fan-shaped plate (300) and the primary air fan and the secondary air fan-shaped plate (200) is the secondary air chamber II (800), and the area enclosed by two adjacent primary air fan and the secondary air fan-shaped plate (200) is the primary air chamber (900).

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