Nitric acid unit based on high-voltage motor

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By adding reinforcement plates and shock absorbing mechanisms to the bottom of the high-voltage motor, the shaft head length and weight reduction coupling are shortened, and the problem of increased vibration of the high-voltage motor during high-speed operation is solved, and stability and production efficiency are improved.

CN119401730APending Publication Date: 2025-02-07HEBEI JIHENG SINCRITY CHEM CO LTD

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Patent Information

Application Number: CN202411528474.3
Authority / Receiving Office: CN · China
Patent Type: Applications(China)
Current Assignee / Owner
Filing Date: 2024-10-30
Publication Date: 2025-02-07

AI Technical Summary

Technical Problem

The nitric acid unit driven by existing high-voltage motors vibrates at high speeds, resulting in unit interlocking and affecting production efficiency.

Method used

By adding reinforcement plates at the bottom of the high-voltage motor and providing support through at least two shock absorbing mechanisms, the shaft head length and shape of the high-voltage motor are shortened, and the weight reduction coupling is used to improve the stability and critical rotation speed of the high-voltage motor.

Benefits of technology

It effectively reduces the vibration during operation of high-voltage motors, improves its stability, ensures the continuous production of high-voltage motors, and reduces operating costs.

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Abstract

According to the nitric acid unit based on the high-voltage motor, the high-voltage motor, a nitric oxide compressor, a reduction gearbox, an axial flow compressor and a tail gas turbo expander are installed on a combined base, and the four corners of the bottom of the base are each connected with the top of a vertically-arranged first fixing rod; the centers of the bottoms of the two sides of the long edge of the base are connected with the tops of first fixing rods arranged vertically respectively, reinforcing rib plates are arranged at the positions, corresponding to the high-voltage motor, of the bottom of the base, the top area of the reinforcing rib plates is larger than the bottom area of the high-voltage motor, and the centers of the bottoms of the reinforcing rib plates are connected with the tops of second fixing rods arranged vertically. Damping mechanisms are arranged between the upper portions of the second fixing rods and the bottoms of the reinforcing rib plates. The reinforcing rib plate is additionally arranged at the bottom of the high-voltage motor, a supporting effect is achieved through the second fixing rod, and effective supporting can be provided for the high-voltage motor during operation through the at least two damping mechanisms, so that the stability of the high-voltage motor during operation is improved, and vibration of the high-voltage motor during operation is reduced.

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Description

Technical Field

[0001] The invention belongs to the field of nitric acid production, in particular to a nitric acid unit based on a high-voltage motor. Background Art

[0002] Nitric acid is one of the commonly used basic chemical raw materials in industrial production. At present, the most commonly used four-in-one unit for nitric acid production is composed of a steam turbine, a nitric oxide compressor, an axial flow compressor and a tail gas turbine expander. At present, the four-in-one unit drives the nitric oxide compressor, the axial flow compressor and the tail gas turbine expander through the steam turbine. However, the operation of the steam turbine requires a set of steam production equipment, which increases the equipment cost and site cost. At the same time, in order to ensure the normal use of the steam turbine, it is necessary to connect the steam turbine after the steam volume is stable, and the operation of the steam turbine is complicated, resulting in high operating costs. Since the steam turbine only provides power Therefore, we are now studying high-voltage motors as drive equipment to replace steam turbines. After practical use, high-voltage motors can relatively well replace steam turbines as drive equipment, and high-voltage motors do not require steam production equipment, and are easy to start, thereby reducing equipment costs, site costs and operating costs. However, when the current high-voltage motors are connected to the nitrogen oxide compressor, axial flow compression and exhaust gas turbine expander during operation, after running to 8000rpm / min, the vibration value continues to increase, and the vibration curve becomes a sine wave, which continues to increase, and finally reaches the unit interlocking value and jumps, resulting in inability to produce continuously, affecting production efficiency. Summary of the invention

[0003] The invention provides a nitric acid unit based on a high-voltage motor, which is used to solve the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions:

[0005] A nitric acid unit based on a high-voltage motor comprises a high-voltage motor, wherein the high-voltage motor is connected to a nitrogen oxide compressor through a coupling, the nitrogen oxide compressor is connected to an axial flow compressor through a reduction box, the axial flow compressor is connected to an exhaust gas turbine expander, the high-voltage motor, the nitrogen oxide compressor, the reduction box, the axial flow compressor and the exhaust gas turbine expander are arranged on a base, the four corners of the bottom of the base are respectively fixedly connected to the top of a vertically arranged first fixing rod, the bottom central positions of both sides of the long side of the base are respectively fixedly connected to the top of a vertically arranged first fixing rod, the bottom of the first fixing rod is fixedly connected to the workshop floor, a reinforcing rib plate is arranged at the corresponding position of the bottom of the base and the high-voltage motor, the top area of the reinforcing rib plate is larger than the bottom area of the high-voltage motor, the bottom central position of the reinforcing rib plate is fixedly connected to the top of a vertically arranged second fixing rod, the bottom of the second fixing rod is fixedly connected to the workshop floor, and at least two shock absorbing mechanisms are arranged between the upper part of the second fixing rod and the bottom of the reinforcing rib plate.

[0006] As described above, in a nitric acid unit based on a high-voltage motor, the shock-absorbing mechanism includes a first connecting rod, one end of the first connecting rod is hingedly connected to the second fixed rod, the other end of the first connecting rod is fixedly connected to the outer ring of the first bearing, the inner ring of the first bearing is fixedly connected to one end of the first screw, the other end of the first screw can be threadedly connected to one end of a sleeve, the other end of the sleeve is threadedly connected to one end of the second screw, a shock-absorbing spring is arranged in the sleeve, one end of the shock-absorbing spring is fixedly connected to one end of the first screw located in the sleeve, the other end of the shock-absorbing spring is fixedly connected to one end of the second screw located in the sleeve, the second screw is fixedly connected to the inner ring of the second bearing, the outer ring of the second bearing is fixedly connected to one end of the second connection, and the other end of the second connection is hingedly connected to the bottom of the reinforcing rib plate.

[0007] In the nitric acid unit based on a high-voltage motor as described above, the shaft head diameter of the high-voltage motor is 90 mm, and the shaft head length of the high-voltage motor 1 is 350 mm.

[0008] In the nitric acid unit based on a high-voltage motor as described above, the shaft head of the high-voltage motor is conical.

[0009] In the nitric acid unit based on a high-voltage motor as described above, the coupling reduces weight by 10-15 kg by shortening the length of the intermediate shaft.

[0010] In the nitric acid unit based on a high-voltage motor as described above, the high-voltage motor is an asynchronous motor.

[0011] In the nitric acid unit based on a high-voltage motor as described above, the rated power of the high-voltage motor is 6500KVA; the rated voltage of the high-voltage motor is input 10KV / output 6.6kV.

[0012] As described above, in a nitric acid unit based on a high-voltage motor, the production operation speed fluctuation range of the high-voltage motor is 75-105%; the speed control range of the high-voltage motor is 70-100% square torque, 100-105% constant power.

[0013] The advantages of the present invention are as follows: the present invention can provide effective support for the high-voltage motor during operation by adding a reinforcing rib plate to the bottom of the high-voltage motor and supporting it through a second fixing rod and then through at least two shock-absorbing mechanisms, thereby improving the stability of the high-voltage motor during operation and reducing its vibration during use; at the same time, the present invention further improves the critical speed of the high-voltage motor by shortening the length and shape of the shaft head of the high-voltage motor and shortening and reducing the weight of the coupling, thereby ensuring the stability of the operation of the high-voltage motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 yes Figure 1 A partial enlarged view of part I.

[0017] Figure numerals: 1. high-voltage motor; 2. coupling; 3. nitrogen oxide compressor; 4. reduction gearbox; 5. axial-flow compressor; 6. exhaust gas turbine expander; 7. base; 8. first fixing rod; 9. reinforcing rib plate; 10. second fixing rod; 11. first connecting rod; 12. first bearing; 13. first screw; 14. sleeve; 15. second screw; 16. shock-absorbing spring; 17. second bearing; 18. second connection. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The present invention is achieved through the following technical solutions:

[0020] A nitric acid unit based on a high-voltage motor comprises a high-voltage motor 1, wherein the high-voltage motor 1 is connected to a nitrogen oxide compressor 3 through a coupling 2, the nitrogen oxide compressor 3 is connected to an axial flow compressor 5 through a reduction box 4, the axial flow compressor 5 is connected to a tail gas turbine expander 6, the high-voltage motor 1, the nitrogen oxide compressor 3, the reduction box 4, the axial flow compressor 5 and the tail gas turbine expander 6 are arranged on a base 7, the four corners of the bottom of the base 7 are respectively fixedly connected to the top of a vertically arranged first fixing rod 8, the bottom central positions of both sides of the long side of the base 7 are respectively fixedly connected to the top of a vertically arranged first fixing rod 8, the bottom of the first fixing rod 8 is fixedly connected to the workshop floor, a reinforcing rib plate 9 is arranged at the corresponding position of the bottom of the base 7 and the high-voltage motor 1, the top area of the reinforcing rib plate 9 is larger than the bottom area of the high-voltage motor 1, the bottom central position of the reinforcing rib plate 9 is fixedly connected to the top of a vertically arranged second fixing rod 10, the bottom of the second fixing rod 10 is fixedly connected to the workshop floor, and at least two shock absorbing mechanisms are arranged between the upper part of the second fixing rod 10 and the bottom of the reinforcing rib plate 9. The present invention can provide effective support for the high-voltage motor 1 during operation by adding a reinforcing rib plate 9 to the bottom of the high-voltage motor 1 and supporting it through a second fixing rod 10 and then providing at least two shock absorbing mechanisms, thereby improving the stability of the high-voltage motor 1 during operation and reducing its vibration during use.

[0021] Specifically, the shock absorbing mechanism described in this embodiment includes a first connecting rod 11, one end of the first connecting rod 11 is hingedly connected to the second fixing rod 10, the other end of the first connecting rod 11 is fixedly connected to the outer ring of the first bearing 12, the inner ring of the first bearing 12 is fixedly connected to one end of the first screw 13, the other end of the first screw 13 can be threadedly connected to one end of the sleeve 14, the other end of the sleeve 14 is threadedly connected to one end of the second screw 15, a shock absorbing spring 16 is arranged in the sleeve 14, one end of the shock absorbing spring 16 is fixedly connected to one end of the first screw 13 located in the sleeve 14, the other end of the shock absorbing spring 16 is fixedly connected to one end of the second screw 15 located in the sleeve 14, the second screw 15 is fixedly connected to the inner ring of the second bearing 17, the outer ring of the second bearing 17 is fixedly connected to one end of the second connection 18, and the other end of the second connection 18 is hingedly connected to the bottom of the reinforcing rib plate 9. When the high-voltage motor 1 vibrates to drive the base 7 to vibrate during use of the present invention, the shock-absorbing spring 16 can play a certain role in absorbing vibration and stabilizing shock absorption. At the same time, since the first screw 13 and the second screw 15 are both threadedly connected to the sleeve 14 and the two can rotate relative to each other, the resistance of the threaded connection can further alleviate the force driven by vibration, thereby further improving the construction effect and ensuring the stable use of the high-voltage motor 1.

[0022] Specifically, the shaft head diameter of the high-voltage motor 1 described in this embodiment is 90 mm, and the shaft head length of the high-voltage motor 1 is 350 mm. The present invention shortens the original shaft head length from 475 mm to 350 mm, thereby further improving the stability of the high-voltage motor 1 during rotation.

[0023] More specifically, the shaft head of the high-voltage motor 1 described in this embodiment is conical. The shaft head of the high-voltage motor 1 in the present invention is changed from the original cylindrical double key to a conical shape, further reducing weight and thus further improving the stability of the high-voltage motor 1 during rotation.

[0024] More specifically, the coupling 2 described in this embodiment reduces weight by 10-15 kg by shortening the intermediate shaft length. The invention reduces weight by shortening the intermediate shaft length of the coupling 2 to improve the stability of the high-voltage motor 1 during rotation and ensure stable operation of the high-voltage motor 1.

[0025] Furthermore, the high-voltage motor 1 described in this embodiment is an asynchronous motor.

[0026] Furthermore, the rated power of the high-voltage motor 1 described in this embodiment is 6500KVA; the rated voltage of the high-voltage motor 1 is input 10Kv / output 6.6kV.

[0027] Furthermore, the production and operation speed fluctuation range of the high-voltage motor 1 described in this embodiment is: 75-105%; the speed control range of the high-voltage motor is: 70-100% square torque, 100-105% constant power.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nitric acid unit based on a high voltage motor, characterized in that: The invention comprises a high-voltage motor (1), wherein the high-voltage motor (1) is connected to a nitrogen oxide compressor (3) via a coupling (2), wherein the nitrogen oxide compressor (3) is connected to an axial flow compressor (5) via a reduction gear box (4), wherein the axial flow compressor (5) is connected to an exhaust gas turbine expander (6), wherein the high-voltage motor (1), the nitrogen oxide compressor (3), the reduction gear box (4), the axial flow compressor (5) and the exhaust gas turbine expander (6) are arranged on a base (7), wherein the four corners of the bottom of the base (7) are respectively fixedly connected to the top of a first vertically arranged fixing rod (8), and the bottom centers of both sides of the long side of the base (7) are fixedly connected to the top of a first vertically arranged fixing rod (8). The positions are respectively fixedly connected to the top of a first vertically arranged fixing rod (8), the bottom of the first fixing rod (8) is fixedly connected to the workshop floor, a reinforcing rib plate (9) is arranged at the bottom of the base (7) and at the corresponding position of the high-voltage motor (1), the top area of the reinforcing rib plate (9) is larger than the bottom area of the high-voltage motor (1), the central position of the bottom of the reinforcing rib plate (9) is fixedly connected to the top of a second vertically arranged fixing rod (10), the bottom of the second fixing rod (10) is fixedly connected to the workshop floor, and at least two shock absorbing mechanisms are arranged between the upper part of the second fixing rod (10) and the bottom of the reinforcing rib plate (9).

2. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The shock absorbing mechanism comprises a first connecting rod (11), one end of the first connecting rod (11) is hingedly connected to the second fixing rod (10), the other end of the first connecting rod (11) is fixedly connected to the outer ring of the first bearing (12), the inner ring of the first bearing (12) is fixedly connected to one end of the first screw rod (13), the other end of the first screw rod (13) can be threadedly connected to one end of the sleeve (14), the other end of the sleeve (14) is threadedly connected to one end of the second screw rod (15), and the sleeve (14) A shock absorbing spring (16) is arranged inside, one end of the shock absorbing spring (16) is fixedly connected to one end of the first screw rod (13) located in the sleeve (14), the other end of the shock absorbing spring (16) is fixedly connected to one end of the second screw rod (15) located in the sleeve (14), the second screw rod (15) is fixedly connected to the inner ring of the second bearing (17), the outer ring of the second bearing (17) is fixedly connected to one end of the second connection (18), and the other end of the second connection (18) is hingedly connected to the bottom of the reinforcing rib plate (9).

3. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The shaft head diameter of the high-voltage motor (1) is 90 mm, and the shaft head length of the high-voltage motor (1) is 350 mm.

4. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The shaft head of the high-voltage motor (1) is conical.

5. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The coupling (2) reduces weight by 10-15 kg by shortening the length of the intermediate shaft.

6. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The high-voltage motor (1) is an asynchronous motor.

7. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The rated power of the high-voltage motor (1) is 6500KVA; the rated voltage of the high-voltage motor (1) is input 10KV / output 6.6kV.

8. A nitric acid unit based on a high voltage motor according to claim 1, characterized in that: The production operation speed fluctuation range of the high-voltage motor (1) is 75-105%; the speed control range of the high-voltage motor (1) is 70-100% square torque, 100-105% constant power.