Sulfur dioxide fan with ultra-large flow

Abstract

The utility model provides a sulfur dioxide fan with ultra-large flow. The sulfur dioxide fan mainly solves the technical problems that a traditional sulfur dioxide fan is low in flow, poor in stability and reliability, high in maintenance cost, large in maintenance difficulty and the like. The sulfur dioxide fan comprises a machine shell, a rotor assembly, a bearing box, a supporting assembly and a sealing assembly. The machine shell is of a volute structure. The rotor assembly comprises a main shaft, an impeller and an impeller fixing cap; one end of the spindle is located in the shell and used for installing the impeller. The impeller fixing cap is installed at the end, away from the spindle, of the impeller. The diameter of the impeller ranges from 1770 mm to 1850 mm. The other end of the main shaft is located outside the machine shell and used for installing a bearing box, and a bearing assembly is arranged in the bearing box. The main shaft is connected with the shell through a first flange; in addition, the supporting assembly provides stable supporting for the machine shell and the bearing box, and the sealing assembly is used for providing the overall sealing performance of the device. Compared with a traditional sulfur dioxide fan, the flow of the sulfur dioxide fan is greatly increased.

Description

Technical Field

[0001] The utility model relates to a centrifugal compressor, in particular to a sulfur dioxide fan with an ultra-large flow rate. Background Art

[0002] In the process of smelting copper ore in a metallurgical furnace, a large amount of high-temperature flue gas containing sulfur dioxide will be produced. If it is directly discharged into the atmosphere, it will not only cause a waste of heat, but also pollute the environment. At present, the commonly used method is to pass the high-temperature flue gas through a waste heat boiler to recover the heat in the flue gas; then after the wet purification section, it is sent to a packed tower to contact with dilute sulfuric acid sprayed from top to bottom, thereby reducing the concentration of impurities such as mine dust in the flue gas. At the same time, the temperature of the flue gas is reduced to about 45°C; the flue gas coming out of the packed tower enters a two-stage series electric precipitator to further remove the acid mist and residual flue gas in the flue gas, and then it is dried with concentrated sulfuric acid; the dried flue gas is pressurized by a sulfur dioxide blower and enters the "two-turn and two-absorption" process system to produce sulfuric acid, which effectively reduces the concentration of sulfur dioxide in the flue gas, so that it meets the emission standards and is discharged into the atmosphere.

[0003] At present, the largest scale of non-ferrous copper smelting production lines at home and abroad is 400,000 tons / year, and the commonly used ones are 300,000 tons / year, 200,000 tons / year, 150,000 tons / year, and 100,000 tons / year. However, with the replacement and upgrading of production capacity in recent years, the 100,000 tons / year production line has been gradually eliminated due to its low production capacity and less use. It can be seen that the scale of non-ferrous copper smelting production lines in the domestic and foreign markets is approaching large-scale, but the flow rate of traditional sulfur dioxide fans is relatively low, and currently cannot fully meet the requirements of large-scale production lines.

[0004] In addition, the impeller and main shaft of the traditional sulfur dioxide fan are connected by flanges, which mainly rely on the flange connection bolts to transmit torque. Its stability and reliability are poor and prone to failure, resulting in increased maintenance costs. In addition, during the inspection and maintenance of the fan, due to the corrosiveness of the sulfur dioxide medium, it is inconvenient to disassemble and assemble the impeller, which increases the difficulty of maintenance. Utility Model Content

[0005] The utility model aims to provide a sulfur dioxide blower with an ultra-large flow rate, mainly to solve the technical problems of traditional sulfur dioxide blowers such as low flow rate, poor stability and reliability, high maintenance cost and great maintenance difficulty.

[0006] To achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A sulfur dioxide blower with an ultra-large flow rate, which is special in that it includes a casing, a rotor assembly, a bearing box, a support assembly and a sealing assembly;

[0008] The casing is a volute structure, one end of which is an air inlet and the other end is an air outlet;

[0009] The rotor assembly comprises a main shaft, an impeller and an impeller fixing cap; the main shaft is coaxially arranged with the casing, the air inlet of the casing is arranged along the axial direction of the main shaft, and the air outlet is arranged along the radial direction of the main shaft;

[0010] One end of the main shaft is located in the casing and is installed with the impeller; the impeller fixing cap is installed at the end of the impeller away from the main shaft; the diameter of the impeller is 1770-1850mm; the other end of the main shaft is located outside the casing and is used to install the bearing box, the bearing box is provided with a bearing assembly, and the other end of the main shaft is installed in the bearing box through the bearing assembly; the casing is provided with a first flange coaxial with the air inlet on one side away from the air inlet, and the main shaft is connected to the casing through the first flange;

[0011] The support assembly comprises a first support member and a second support member for supporting the housing and the bearing box respectively; wherein the first support member is located below the housing, and the second support member is located below the bearing box;

[0012] The sealing assembly comprises a first sealing member and a second sealing member, wherein the first sealing member is located at the connection between the main shaft and the first flange, and the second sealing member is located at the connection between the main shaft and the bearing box.

[0013] Furthermore, it also includes an inlet guide vane adjustment mechanism disposed at the air inlet of the casing, for adjusting the working conditions at the air inlet;

[0014] The support assembly also includes a third support member, which is located below the inlet guide vane adjustment mechanism and is used to support the inlet guide vane adjustment mechanism.

[0015] Furthermore, the main shaft is sleeved with a second flange, which is located between the first flange and the impeller; the impeller is connected to the main shaft through the second flange and fastened through a connecting piece, wherein the connecting piece includes a screw and a nut;

[0016] A mounting hole is axially arranged at the center of the end surface of the connecting end of the main shaft and the impeller. One end of the screw rod passes through the impeller and enters the mounting hole, and the other end is located in the impeller fixing cap and is locked by a nut, so that the impeller is installed on the main shaft.

[0017] Furthermore, a first flushing port is radially provided on the casing and is located on the inner wall of the casing between the inlet guide vane adjustment mechanism and the impeller; and a second flushing port is axially provided on the first flange.

[0018] Furthermore, the impeller is made of titanium alloy.

[0019] Furthermore, the first sealing member is a carbon ring seal.

[0020] Furthermore, the bearing assembly is a sliding bearing assembly, and the other end of the main shaft is installed in the bearing box through the sliding bearing assembly.

[0021] Furthermore, the housing is a split structure, including an upper housing and a lower housing that are connected to each other.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] 1. The utility model provides a sulfur dioxide blower with ultra-large flow rate. The impeller in the rotor assembly adopts a large flow model stage, and its diameter can reach 1770-1850mm, thereby greatly improving the flow rate of the sulfur dioxide blower; at the same time, combined with the matching design of the casing, bearing box, support assembly and sealing assembly, the working stability and reliability of the overall structure are simultaneously improved.

[0024] 2. The sulfur dioxide blower with ultra-large flow provided by the utility model is provided with an inlet guide vane adjustment mechanism at the air inlet of the casing, which can not only adjust the inlet working conditions, but also realize rapid disassembly and rapid replacement during blower maintenance without affecting the operation of the entire device.

[0025] 3. The utility model provides a sulfur dioxide blower with an ultra-large flow rate, and the main shaft and the impeller are also connected by a tie rod structure composed of a screw and a nut. This method increases the transmission torque of the rotor assembly and meets the transmission requirements of large-flow gas; at the same time, it also has the advantages of easy disassembly and assembly and high installation precision.

[0026] 4. The utility model provides a sulfur dioxide blower with an ultra-large flow rate. The design of the first flushing port and the second flushing port allows the front and rear of the impeller to be flushed during maintenance without disassembling the entire machine, thereby shortening the maintenance time.

[0027] 5. The impeller of the sulfur dioxide blower with ultra-large flow provided by the utility model is made of titanium alloy. On the one hand, the material improves the corrosion resistance of the impeller in view of the strong corrosiveness of high-temperature sulfur dioxide flue gas, greatly prolongs the service life of the sulfur dioxide blower, thereby improving the acid production efficiency and economy; on the other hand, the density of titanium alloy is about 4.51×10 3 kg / m 3 , which is only about 60% of carbon steel and stainless steel. Therefore, the weight of the impeller can be reduced by about 40%, which not only improves the stability of the rotor assembly, but also plays an important role in improving the reliability of the entire process system.

[0028] 6. The utility model provides a sulfur dioxide blower with an ultra-large flow rate. The first seal is a carbon ring seal. During maintenance, the carbon ring seal can be disassembled, repaired, and replaced with spare parts without disassembling the rotor, thereby reducing the maintenance workload and shortening the maintenance period. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0030] Figure 2 It is a schematic structural diagram of the rotor assembly in an embodiment of the utility model.

[0031] The reference numerals are as follows:

[0032] 1- casing, 2- bearing box, 3- main shaft, 4- impeller, 5- impeller fixing cap, 6- first flange, 7- first support, 8- second support, 9- first seal, 10- second seal, 11- inlet guide vane adjustment mechanism, 12- third support, 13- second flange, 14- screw, 15- nut, 16- mounting hole, 17- first flushing port, 18- second flushing port. DETAILED DESCRIPTION

[0033] The solution of the utility model is described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] This embodiment aims at the traditional non-ferrous copper smelting "two-turn two-suction" sulfuric acid production process system. From the perspectives of increasing the flow rate of the sulfur dioxide blower, improving the stability and reliability of the blower operation, reducing the user's initial investment, and operating and maintenance costs, a unique and advanced design concept is adopted to develop a sulfur dioxide blower with an ultra-large flow rate in view of the particularity of the acid production process system.

[0035] Combination Figure 1 and Figure 2 As shown, the sulfur dioxide blower of this embodiment includes a casing 1, a rotor assembly, a bearing box 2, a support assembly and a sealing assembly.

[0036] The casing 1 is a volute structure, one end of which is an air inlet and the other end is an air outlet. In order to facilitate disassembly and assembly, the casing 1 can also be a split structure, including an upper casing and a lower casing connected to each other. This design can not only reduce the difficulty of processing and manufacturing each part, but also use a three-dimensional flow design in the manufacturing process to further improve the smoothness of the flow channel, shorten the flow distance of the airflow in the casing 1, thereby reducing the friction loss and power loss of the gas and improving the efficiency of the fan.

[0037] The rotor assembly includes a main shaft 3, an impeller 4 and an impeller fixing cap 5; the main shaft 3 is coaxially arranged with the casing 1, the air inlet of the casing 1 is arranged along the axial direction of the main shaft 3, and the air outlet is arranged along the radial direction of the main shaft 3, thereby improving the working efficiency of the fan.

[0038] One end of the main shaft 3 is located in the casing 1, and is installed with an impeller 4; the impeller fixing cap 5 is installed at one end of the impeller 4 away from the main shaft 3. Specifically, a second flange 13 is sleeved on the main shaft 3, which is located between the first flange 6 and the impeller 4. The impeller 4 is connected to the main shaft 3 through the second flange 13 and is fastened by a connecting piece, wherein the connecting piece includes a screw 14 and a nut 15. A mounting hole 16 is axially provided on the center of the end surface of the connecting end of the main shaft 3 and the impeller 4. One end of the screw 14 passes through the impeller 4 and enters the mounting hole 16, and the other end is located in the impeller fixing cap 5 and is locked by the nut 15, so as to realize the installation of the impeller 4 on the main shaft 3. This connection method has the advantages of large torque transmission, convenient disassembly and assembly, and high installation accuracy.

[0039] The impeller 4 adopts a large flow model and is a semi-open impeller with backward blades. Its diameter can reach 1770-1850mm. This design allows the impeller 4 to meet the large flow while reducing its weight, thus increasing the stability of the rotor assembly. Based on this design, the air intake of the sulfur dioxide blower in this embodiment can reach 380,000Nm 3 / h, which greatly improves the flow rate of the sulfur dioxide blower and meets the requirements of large-scale production lines.

[0040] In addition, the impeller 4 is made of titanium alloy. On the one hand, the material improves the corrosion resistance of the impeller 4, considering the strong corrosiveness of high-temperature sulfur dioxide flue gas, greatly prolongs the service life of the sulfur dioxide blower, thereby improving the acid production efficiency and economy. On the other hand, the density of titanium alloy is about 4.51×10 3 kg / m 3 , which is only about 60% of carbon steel and stainless steel. Therefore, the weight of the impeller 4 can be reduced by about 40%. For the single cantilever structure fan, it not only improves the stability of the rotor assembly, but also plays an important role in improving the reliability of the entire process system.

[0041] The other end of the main shaft 3 is located outside the casing 1 and is used to install the bearing box 2. The bearing box 2 is provided with a sliding bearing assembly, and the other end of the main shaft 3 is installed in the bearing box 2 through the sliding bearing assembly. The casing 1 is provided with a first flange 6 coaxial with the air inlet on the side away from the air inlet, and the main shaft 3 is connected to the casing 1 through the first flange 6. Specifically, the main shaft 3 is connected to the first flange 6 through a rolling bearing, and the first flange 6 is fastened to the casing 1 through bolts.

[0042] The rotor assembly of this embodiment is a rigid rotor, that is, the first-order critical speed of the rotor is higher than the operating speed, thereby ensuring that the fan always operates below the critical speed, ensuring safe and reliable operation of the unit.

[0043] The present embodiment also includes an inlet guide vane adjustment mechanism 11 disposed at the air inlet of the casing 1, which can not only adjust the operating conditions of the fan with high adjustment accuracy, but also achieve rapid disassembly and replacement during fan maintenance without affecting the operation of the entire device.

[0044] The support assembly includes a first support member 7, a second support member 8, and a third support member 12, which respectively support the casing 1, the bearing box 2, and the inlet guide vane adjustment mechanism 11; wherein, the first support member 7 is located below the casing 1, the second support member 8 is located below the bearing box 2, and the third support member 12 is located below the inlet guide vane adjustment mechanism 11. The above support makes the overall operation of the fan more stable. At the same time, during maintenance, it is only necessary to dismantle the flanges on both sides of the inlet guide vane adjustment mechanism 11, thereby dismantling the inlet guide vane adjustment mechanism 11 as a whole, and performing overall maintenance. At the same time, the adjustment mechanism is replaced with a short section, and the machine can be started without affecting the operation of the device.

[0045] The sealing assembly includes a first sealing member 9 and a second sealing member 10, wherein the first sealing member 9 is located at the connection between the main shaft 3 and the first flange 6. The first sealing member 9 can be a carbon ring seal. During maintenance, the carbon ring seal can be disassembled, repaired, and replaced without disassembling the rotor, thereby reducing the amount of maintenance and shortening the maintenance period. The second sealing member 10 is located at the connection between the main shaft 3 and the bearing box 2 to improve the overall sealing of the device.

[0046] A first flushing port 17 is radially provided on the casing 1, which is located on the casing wall between the inlet guide vane adjustment mechanism 11 and the impeller 4; a second flushing port 18 is axially provided on the first flange 6. The design of the first flushing port 17 and the second flushing port 18 allows the front and rear of the impeller 4 to be flushed during maintenance without disassembling the entire machine, thereby shortening the maintenance time.

[0047] The sulfur dioxide blower of this embodiment has been verified in actual use and can be applied to a 150,000-ton copper smelting production line. Therefore, this type of sulfur dioxide blower has high application value and economic value.

Claims

1. A sulfur dioxide blower with ultra-large flow, characterized in that: It comprises a casing (1), a rotor assembly, a bearing box (2), a support assembly and a sealing assembly; The casing (1) is a volute structure, one end of which is an air inlet and the other end is an air outlet; The rotor assembly comprises a main shaft (3), an impeller (4) and an impeller fixing cap (5); the main shaft (3) is coaxially arranged with the casing (1), the air inlet of the casing (1) is arranged along the axial direction of the main shaft (3), and the air outlet is arranged along the radial direction of the main shaft (3); One end of the main shaft (3) is located in the casing (1) and is installed with the impeller (4); the impeller fixing cap (5) is installed at the end of the impeller (4) away from the main shaft (3); the diameter of the impeller (4) is 1770-1850 mm; the other end of the main shaft (3) is located outside the casing (1) and is used to install the bearing box (2), the bearing box (2) is provided with a bearing assembly, and the other end of the main shaft (3) is installed in the bearing box (2) through the bearing assembly; the casing (1) is provided with a first flange (6) coaxial with the air inlet on the side away from the air inlet, and the main shaft (3) is connected to the casing (1) through the first flange (6); The support assembly comprises a first support member (7) and a second support member (8) for supporting the housing (1) and the bearing box (2) respectively; wherein the first support member (7) is located below the housing (1) and the second support member (8) is located below the bearing box (2); The sealing assembly comprises a first sealing member (9) and a second sealing member (10), wherein the first sealing member (9) is located at the connection between the main shaft (3) and the first flange (6), and the second sealing member (10) is located at the connection between the main shaft (3) and the bearing box (2).

2. The sulfur dioxide blower with ultra-large flow rate according to claim 1, characterized in that: It also includes an inlet guide vane adjustment mechanism (11) arranged at the air inlet of the casing (1) and used for adjusting the working condition of the air inlet; The support assembly further comprises a third support member (12), which is located below the inlet guide vane adjustment mechanism (11) and is used to support the inlet guide vane adjustment mechanism (11).

3. The sulfur dioxide blower with ultra-large flow rate according to claim 2, characterized in that: The main shaft (3) is sleeved with a second flange (13), which is located between the first flange (6) and the impeller (4); the impeller (4) is connected to the main shaft (3) through the second flange (13) and is fastened through a connecting piece, wherein the connecting piece includes a screw (14) and a nut (15); A mounting hole (16) is axially arranged at the center of the end surface of the connecting end of the main shaft (3) and the impeller (4); one end of the screw rod (14) passes through the impeller (4) and enters the mounting hole (16); the other end is located in the impeller fixing cap (5) and is locked by a nut (15), thereby mounting the impeller (4) on the main shaft (3).

4. The sulfur dioxide blower with ultra-large flow rate according to claim 1, 2 or 3, characterized in that: The casing (1) is provided with a first flushing port (17) in the radial direction, which is located on the casing wall between the inlet guide vane adjustment mechanism (11) and the impeller (4); A second flushing port (18) is axially provided on the first flange (6).

5. The sulfur dioxide blower with ultra-large flow rate according to claim 4, characterized in that: The impeller (4) is made of titanium alloy.

6. The sulfur dioxide blower with ultra-large flow rate according to claim 5, characterized in that: The first sealing member (9) is a carbon ring seal.

7. The sulfur dioxide blower with ultra-large flow rate according to claim 6, characterized in that: The bearing assembly is a sliding bearing assembly, and the other end of the main shaft (3) is installed in the bearing box (2) through the sliding bearing assembly.

8. The sulfur dioxide blower with ultra-large flow rate according to claim 7, characterized in that: The casing (1) is a split structure, comprising an upper casing and a lower casing which are connected to each other.

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