A centrifugal fan for a catalyst regeneration system in a PDH unit
By introducing air-cooled and water-cooled components into the centrifugal fan of the catalyst regeneration system in the PDH unit, the problem of overheating of the bearing housing at high temperatures was solved, achieving effective heat dissipation and ensuring production stability and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANTONG DART POLLRICH FAN
- Filing Date
- 2025-05-29
- Publication Date
- 2026-07-03
AI Technical Summary
In the existing technology, the centrifugal fan of the catalyst regeneration system of the PDH unit has poor heat dissipation effect in high-temperature environments, which leads to overheating and damage to the bearing housing, affecting production continuity and efficiency.
A cooling assembly including an air-cooled unit and a water-cooled unit was designed. The bearing housing is cooled by a heat dissipation wheel and an annular flow channel. Temperature monitoring is used to control the temperature and prevent overheating.
This effectively improves the heat dissipation efficiency of the bearing housing, reduces the temperature, avoids overheating damage, and ensures production continuity and efficiency.
Smart Images
Figure CN224453126U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of centrifugal fan technology, and more specifically, to a centrifugal fan for a catalyst regeneration system in a PDH device. Background Technology
[0002] A PDH (Propane Dehydrogenation) unit is short for a propane dehydrogenation to propylene unit, which is a chemical equipment that produces propylene through the catalytic dehydrogenation reaction of propane.
[0003] The function of the catalyst regeneration system in a PDH unit is to continuously regenerate the catalyst that has become deactivated due to carbon loss, thereby restoring its reactivity. In the PDH unit's catalyst regeneration system, the centrifugal fan is an important auxiliary device for catalyst regeneration. Its main function is to provide power for the circulation of regeneration gas, ensuring a uniform temperature distribution in the regeneration gas bed, and simultaneously removing some of the burnt heat from the system.
[0004] Due to the special operating conditions, the fan needs to operate continuously in a high-temperature environment. In the existing technology, the heat dissipation structure of the bearing box cannot achieve the expected effect, and it is easy to overheat and be damaged, thus affecting the continuity of production and production efficiency. Utility Model Content
[0005] The purpose of this invention is to provide a centrifugal fan for a catalyst regeneration system in a PDH unit, in order to improve the technical problem that the heat dissipation effect of the centrifugal fan used in the catalyst regeneration system of a PDH unit cannot meet expectations, thereby affecting production efficiency.
[0006] The embodiments of this utility model can be implemented as follows:
[0007] This utility model provides a centrifugal fan for a catalyst regeneration system of a PDH device, including a fan body, a drive assembly for driving the fan body, a transmission assembly for connecting the fan body and the drive assembly, and a cooling assembly for cooling the transmission assembly.
[0008] The transmission assembly includes a bearing housing and a transmission shaft disposed within the bearing housing, and the drive assembly is connected to the fan body via the transmission shaft;
[0009] The cooling assembly includes an air-cooling unit, which is disposed on one side of the bearing housing and is used to improve the heat exchange efficiency between the outer surface of the bearing housing and the air.
[0010] In an optional embodiment, the air-cooling unit includes a heat dissipation wheel, which is sleeved on the drive shaft and is used to increase the airflow velocity on the surface of the bearing housing, thereby improving the heat exchange efficiency between the outer surface of the bearing housing and the air.
[0011] In an optional embodiment, the outer cover of the heat dissipation wheel is provided with a heat dissipation wheel cover.
[0012] In an optional embodiment, the cooling assembly further includes a water-cooling unit;
[0013] The water-cooling unit includes a first annular flow channel, a second annular flow channel, and a connecting flow channel for connecting the first annular flow channel and the second annular flow channel, which are formed on the bearing housing.
[0014] The first annular flow channel and the second annular flow channel are respectively connected to the inlet and the outlet.
[0015] In an optional implementation, the cross-section of the connecting channel can be any one of a circle, an arc, or a trapezoid.
[0016] In an optional embodiment, a temperature monitoring device is provided on the bearing housing, which is used to monitor the temperature of the bearing chamber inside the bearing housing.
[0017] In an optional embodiment, the drive assembly includes a drive motor and a coupling; one end of the drive motor is connected to the transmission shaft via the coupling.
[0018] In an optional embodiment, the coupling is covered with a coupling cover.
[0019] In an optional embodiment, the coupling is a diaphragm coupling.
[0020] In an optional embodiment, the centrifugal fan for the catalyst regeneration system of the PDH unit further includes a base on which an anti-static grounding device is provided.
[0021] The beneficial effects of the centrifugal fan for the catalyst regeneration system of a PDH unit provided in this embodiment of the invention include:
[0022] This utility model includes a fan body, a drive assembly for driving the fan body, a transmission assembly for connecting the fan body and the drive assembly, and a cooling assembly for cooling the transmission assembly. The air-cooling unit in the cooling assembly can effectively accelerate the airflow velocity on the surface of the bearing housing, thereby improving the convective heat transfer efficiency between the bearing housing and the surrounding air, and thus effectively reducing the temperature inside the bearing housing. Attached Figure Description
[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0024] Figure 1 This is a schematic diagram of the structure of the centrifugal fan used in the catalyst regeneration system of the PDH unit provided in this embodiment;
[0025] Figure 2 This is a partial cross-sectional structural diagram of the bearing housing in the centrifugal fan of the catalyst regeneration system of the PDH unit provided in this embodiment.
[0026] Icon: 100 - Main body of the fan;
[0027] 200 - Drive assembly; 210 - Drive motor; 220 - Coupling;
[0028] 300 - Transmission assembly; 310 - Bearing housing; 311 - Temperature monitoring component; 312 - Bearing chamber; 320 - Drive shaft;
[0029] 400 - Cooling assembly; 410 - Air-cooled unit; 411 - Heat sink wheel; 412 - Heat sink wheel cover; 420 - Water-cooled unit; 421 - First annular flow channel; 422 - Second annular flow channel; 423 - Connecting flow channel; 424 - Water inlet; 425 - Water outlet;
[0030] 500 - Base. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.
[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0034] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0036] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.
[0037] PDH refers to propane catalytic dehydrogenation technology, which uses platinum-based or chromium-based catalysts to dehydrogenate pretreated propane under high temperature conditions. The product is then separated and purified to obtain high-purity propylene.
[0038] Propane dehydrogenation units often use platinum as the active metal in the catalyst; however, platinum is prone to carbon buildup during the reaction, leading to a rapid decrease in reactivity. Frequent catalyst regeneration is necessary to ensure that the catalyst maintains high reactivity at all times.
[0039] The following detailed description of the overall structure, working principle, and technical effects of the centrifugal fan for the catalyst regeneration system of a PDH device provided by this utility model, through embodiments and in conjunction with the accompanying drawings, is a practical example.
[0040] The centrifugal fan provided by this utility model for the catalyst regeneration system of a PDH unit is mainly used in the catalyst regeneration system for propane dehydrogenation to propylene production. It provides power for the circulation of regeneration gas, makes the temperature distribution of the regeneration gas bed uniform, and removes part of the coke heat from the system.
[0041] The catalyst regeneration process after propane dehydrogenation has special operating conditions and requires a high maximum operating temperature for the unit. The reaction is usually carried out at 500℃-600℃. Therefore, for structures that are prone to overheating damage, additional cooling and heat dissipation structures must be installed.
[0042] It should be noted that the centrifugal fan structure provided in this embodiment can also be applied to other working systems, and is not limited to the catalyst regeneration system of the PDH device provided in this embodiment.
[0043] Please see Figure 1 This embodiment provides a centrifugal fan for a catalyst regeneration system of a PDH device, including a fan body 100, a drive assembly 200 for driving the fan body 100, a transmission assembly 300 for connecting the fan body 100 and the drive assembly 200, and a cooling assembly 400 for cooling the transmission assembly 300.
[0044] In this embodiment, the fan performance is selected based on actual working conditions, so that the fan casing is mechanically able to operate at 593°C and the fan casing design pressure is 0.035MPa. Under working conditions, the fan is in a corrosive environment, so all pressure-bearing components of the fan are connected by fully penetrating welds inside and outside, all welds inside the casing are ground smooth, the casing is suitable for design and test pressure, and includes a minimum 1 / 8-inch corrosion allowance.
[0045] Meanwhile, the impeller is a torsion impeller with a diameter of 1100mm, made of Inconel600, and has a dynamic balance quality grade of G2.5. The impeller is made by welding the front plate, the rear plate and the blades.
[0046] The aforementioned fan body 100, drive assembly 200, and transmission assembly 300 are fixedly mounted on the base 500. The drive assembly 200 includes a drive motor 210 and a coupling 220, wherein one end of the output shaft of the drive motor 210 is connected to the transmission assembly 300 via the coupling 220.
[0047] The aforementioned transmission assembly 300 includes a bearing housing 310 and a transmission shaft 320 disposed within the bearing housing 310. The output shaft of the drive motor 210 is connected to one end of the transmission shaft 320, and the other end of the transmission shaft 320 is connected to the impeller inside the fan body 100.
[0048] In this embodiment, the coupling 220 is a diaphragm coupling and is an extended section. Its length allows for the maintenance of bearings and seals without removing the motor. At the same time, the coupling 220 is equipped with a spark-free and fully enclosed protective device.
[0049] In addition, to prevent the coupling 220 from being directly exposed to the working environment, in this embodiment, the coupling 220 is covered with a coupling cover.
[0050] In order to prevent the transmission component 300 from overheating and being damaged, in this embodiment, the operating temperature of the transmission component 300 is controlled by the cooling component 400.
[0051] Please see Figure 1 Specifically, the cooling assembly 400 includes an air-cooled unit 410 and a water-cooled unit 420; through the multiple cooling of the air-cooled unit 410 and the water-cooled unit 420, the risk of the transmission assembly 300 being damaged due to overheating is reduced.
[0052] In this embodiment, the air-cooling unit 410 is disposed between the bearing housing 310 and the fan body 100. It includes a heat dissipation wheel 411, which is sleeved and fixed on the shaft between the bearing housing 310 and the fan body 100 and can rotate with the shaft. The heat dissipation wheel 411 can improve the heat exchange efficiency between the outer surface of the bearing housing 310 and the air, thereby achieving cooling of the bearing housing 310.
[0053] Furthermore, the heat sink 411 is made of cast aluminum.
[0054] In addition, in order to prevent the heat dissipation wheel 411 from being directly exposed to the working environment, in this embodiment, a heat dissipation wheel cover 412 is also provided on the outside of the heat dissipation wheel 411.
[0055] To further improve the cooling effect on the transmission assembly 300, in this embodiment, the cooling assembly 400 also includes a water cooling unit 420.
[0056] Please see Figure 2 , Figure 2 The image shows a partial cross-sectional view of the bearing housing 310 in the transmission assembly 300. The water-cooling unit 420 includes a first annular flow channel 421, a second annular flow channel 422, and a connecting flow channel 423 for connecting the first annular flow channel 421 and the second annular flow channel 422 on the bearing housing 310.
[0057] In this embodiment, the bearing housing 310 is made of ductile iron, and two bearing chambers 312 are provided inside the bearing housing 310. The first annular flow channel 421 and the second annular flow channel 422 are respectively arranged around the outside of the two bearing chambers 312 to achieve cooling of the bearing chambers 312.
[0058] In other embodiments, more cooling channels can be provided according to actual working needs, such as a third annular channel, a fourth annular channel, etc., as long as multiple annular channels are connected by a connecting channel 423.
[0059] Furthermore, the first annular flow channel 421 and the second annular flow channel 422 are respectively connected to the inlet 424 and the outlet 425, so as to realize the introduction and discharge of the cooling medium through the inlet 424 and the outlet 425.
[0060] The cross-section of the aforementioned connecting channel 423 can be any one of a circle, an arc, or a trapezoid.
[0061] In order to increase the contact area between the cooling medium and the bearing housing 310, in this embodiment, the connecting channel 423 has an arc-shaped cross-section.
[0062] Meanwhile, in order to monitor the real-time temperature of the bearing housing 310, in this embodiment, a temperature monitoring element 311 is provided on the bearing housing 310. Similar to the arrangement of the first annular flow channel 421 and the second annular flow channel 422, two temperature monitoring elements 311 are provided, which are used to monitor the temperature of the front and rear bearing chambers 312 respectively, and are set at the corresponding positions of the bearing housing 310.
[0063] In this embodiment, the cooling medium can be water, mineral oil, or organic esters.
[0064] In addition, during the operation of a centrifugal fan, static electricity is generated in the fan components due to friction between the impeller and the gas, and friction between the impeller and components such as bearings. If the static electricity is not discharged in time, it will accumulate in the fan casing and base, thus creating a safety hazard.
[0065] To avoid the aforementioned potential hazards, in this embodiment, the base 500 is equipped with multiple anti-static grounding devices.
[0066] In addition, in this embodiment, the base 500 plate is made of Q235 steel, and concrete is filled under the base 500. The mass of the concrete is at least 6 times the total rotating mass of the fan body 100, coupling 220 and drive motor 210.
[0067] The centrifugal fan for the catalyst regeneration system of a PDH device provided by this utility model includes a fan body 100 mounted on a base 500, a drive assembly 200 for driving the fan body 100, a transmission assembly 300 for connecting the fan body 100 and the drive assembly 200, and a cooling assembly 400 for cooling the transmission assembly. The specific working principle of the cooling assembly 400 is as follows:
[0068] In air-cooled operation, when the drive assembly 200 is in operation, the heat dissipation wheel 411 in the air-cooled unit 410 rotates with the shaft, thereby improving the heat exchange efficiency between the outer surface of the bearing housing 310 and the air, and thus achieving cooling of the bearing housing 310.
[0069] In water cooling, cooling medium is pumped into the inlet 424 of the water cooling unit 420, so that the cooling medium is sequentially passed into the first annular flow channel 421, the connecting flow channel 423 and the second annular flow channel 422, and discharged from the outlet 425. The cooling medium can be cooled and then re-enter the above cooling cycle.
[0070] The above description is only a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.
Claims
1. A centrifugal fan for a catalyst regeneration system in a PDH unit, characterized in that, It includes a fan body (100), a drive assembly (200) for driving the fan body (100), a transmission assembly (300) for connecting the fan body (100) and the drive assembly (200), and a cooling assembly (400) for cooling the transmission assembly (300). The transmission assembly (300) includes a bearing housing (310) and a transmission shaft (320) disposed in the bearing housing (310). The drive assembly (200) is connected to the fan body (100) through the transmission shaft (320). The cooling assembly (400) includes an air-cooled unit (410), which is disposed on one side of the bearing housing (310) and is used to improve the heat exchange efficiency between the outer surface of the bearing housing (310) and the air.
2. The centrifugal fan for PDH unit catalyst regeneration system according to claim 1, wherein The air-cooled unit (410) includes a heat dissipation wheel (411), which is sleeved on the drive shaft (320).
3. The centrifugal fan for PDH unit catalyst regeneration system according to claim 2, wherein, The heat dissipation wheel (411) is covered with a heat dissipation wheel cover (412).
4. The centrifugal fan for PDH unit catalyst regeneration system according to claim 1, wherein The cooling assembly (400) also includes a water cooling unit (420). The water-cooling unit (420) includes a first annular flow channel (421), a second annular flow channel (422) formed on the bearing housing (310), and a connecting flow channel (423) for connecting the first annular flow channel (421) and the second annular flow channel (422). The first annular flow channel (421) and the second annular flow channel (422) are respectively connected to the inlet (424) and the outlet (425).
5. The centrifugal fan for PDH unit catalyst regeneration system according to claim 4, wherein The cross-section of the connecting channel (423) can be any one of a circle, an arc, or a trapezoid.
6. The centrifugal fan for PDH unit catalyst regeneration system according to claim 1, wherein A temperature monitoring device (311) is provided on the bearing housing (310), and the temperature monitoring device (311) is used to monitor the temperature of the bearing chamber (312) inside the bearing housing (310).
7. The centrifugal fan for a catalyst regeneration system in a PDH unit according to claim 1, characterized in that, The drive assembly (200) includes a drive motor (210) and a coupling (220); one end of the output shaft of the drive motor (210) is connected to the transmission shaft (320) through the coupling (220).
8. The centrifugal fan for PDH unit catalyst regeneration system according to claim 7, wherein The coupling (220) is covered with a coupling cover on its outer side.
9. The centrifugal fan for PDH unit catalyst regeneration system according to claim 7, wherein The coupling (220) is a diaphragm coupling.
10. The centrifugal fan for PDH unit catalyst regeneration system according to claim 1, wherein The centrifugal fan used in the catalyst regeneration system of the PDH unit also includes a base (500), on which an anti-static grounding device is provided.