High-parameter multi-stage centrifugal steam compressor for industrial steam supply

Abstract

The utility model relates to a high-parameter multi-stage centrifugal steam compressor for industrial steam supply, and aims to solve the problems that the existing steam compressor generally has few stages, weak boosting capacity and low outlet temperature and cannot meet the high-parameter industrial steam supply requirement under the deep adjustment working condition of a power plant. According to the scheme, a front bearing box, a machine shell and a rear bearing box are sequentially arranged on a base frame from front to back, a rotor is arranged in the machine shell, the front end of the rotor is connected with the front bearing box through a front supporting bearing, and the rear end of the rotor is connected with the rear bearing box through a rear supporting bearing; a front steam seal is arranged between the rotor and the front end of the machine shell, a rear steam seal is arranged between the rotor and the rear end of the machine shell, five impellers are fixed to the rotor, and each impeller is arranged between two adjacent elements of the first partition plate, the second partition plate, the third partition plate, the fourth partition plate, the fifth partition plate and the sixth partition plate. The temperature and pressure of large-capacity water vapor are greatly improved, and high-quality steam is supplied to the outside to be used as industrial steam.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal steam compressors, in particular to a high-parameter multi-stage centrifugal steam compressor for industrial steam supply. Background Art

[0002] With the large-scale grid-connected power generation of new energy sources, thermal power units have gradually shifted to regulating power supply, and the peak load has been further reduced, reaching a minimum of 20% of the design load. For a large number of thermal power units with industrial steam supply tasks, the unit parameters are reduced under deep peak-shaving conditions, and the industrial steam supply parameters cannot meet user needs. The steam supply capacity is limited, resulting in a decline in the profitability of power plants. Steam compressors can effectively improve the quality of low-parameter industrial steam supply under deep load regulation, and upgrade it to high-parameter steam to meet steam supply needs. At present, steam compressors generally have few stages, weak boosting capacity, and low outlet temperature, which cannot meet the high-parameter industrial steam supply needs under deep regulation conditions of power plants. Therefore, it is urgent to propose a high-parameter multi-stage centrifugal steam compressor for industrial steam supply to solve the above technical problems. Utility Model Content

[0003] The purpose of this utility model is to solve the problem that current steam compressors generally have few stages, weak boosting capacity, low outlet temperature, and cannot meet the high-parameter industrial steam supply needs under deep adjustment conditions of power plants. The utility model proposes a high-parameter multi-stage centrifugal steam compressor for industrial steam supply.

[0004] A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, comprising a 1# partition plate, a 2# partition plate, a 3# partition plate, a 4# partition plate, a 5# partition plate, a 6# partition plate, a casing, a rotor, a front bearing box, a rear bearing box, a front support bearing, a rear support bearing and a base frame;

[0005] The front bearing box, casing and rear bearing box are arranged on the base frame in sequence from front to back, the rotor is arranged in the casing, the front end of the rotor is connected to the front bearing box through the front support bearing, and the rear end of the rotor is connected to the rear bearing box through the rear support bearing; 1# partition plate, 2# partition plate, 3# partition plate, 4# partition plate, 5# partition plate and 6# partition plate are fixed on the inner wall of the casing in sequence from front to back, a front steam seal is provided between the rotor and the front end of the casing, and a rear steam seal is provided between the rotor and the rear end of the casing. Five impellers are fixed on the rotor, and the rotor passes through 1# partition plate, 2# partition plate, 3# partition plate, 4# partition plate, 5# partition plate and 6# partition plate, and each impeller is provided between two adjacent elements among 1# partition plate, 2# partition plate, 3# partition plate, 4# partition plate, 5# partition plate and 6# partition plate.

[0006] Furthermore, a bearing box oil retaining ring is installed at the front end of the front bearing box.

[0007] Furthermore, an airtight oil retaining ring is respectively installed at the rear end of the front bearing box and the front end of the rear bearing box, and a connecting air guide pipe is installed on the airtight oil retaining ring.

[0008] Furthermore, the rear end of the rotor is connected to the rear bearing box via a thrust bearing, and the rotor expands toward the steam inlet side of the steam compressor with the thrust bearing as the dead point.

[0009] Furthermore, the casing is connected to the base frame through a bracket, and the bracket on the exhaust side of the casing steam compressor is a dead point and expands toward the steam inlet side.

[0010] Furthermore, the tip clearance of the impeller is zero.

[0011] Furthermore, a center key is provided at the middle of the rear end of the front bearing box and the middle of the front end of the rear bearing box, and the front bearing box and the rear bearing box are respectively connected to the casing through a center key.

[0012] Furthermore, an I-shaped balancing drum is provided at the outlet of the casing.

[0013] Furthermore, the casing is composed of an upper shell and a lower shell, and the sealing areas of the upper shell and the lower shell and the low points of the casing are all provided with hydrophobic holes.

[0014] Furthermore, a sealing key is designed between the upper shell and the lower shell, and the gap between the upper shell and the lower shell is filled with sealing grease.

[0015] Beneficial effects:

[0016] It can increase the number of centrifugal steam compressor stages to 5, effectively improving the pressure ratio of the centrifugal steam compressor, and can increase the superheated steam pressure of 0.7MPa at the inlet to 1.5MPa, greatly increasing the steam pressure, and operate safely and stably at higher temperatures. At the same time, it can increase the temperature rise of the centrifugal steam compressor, and can increase the temperature of the inlet 215℃ steam to 330℃, greatly increasing the steam temperature, achieving a significant increase in the temperature and pressure of large-capacity water vapor, and supplying high-quality steam to the outside for industrial use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view of a high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to the present invention;

[0018] Figure 2 This is a schematic diagram of a high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to the present invention;

[0019] Figure 3 This utility model Figure 2 A top view of

[0020] Figure 4 It is a schematic diagram of the impeller of the present utility model;

[0021] Figure 5 This is a schematic diagram of a high-parameter multi-stage centrifugal steam compressor for industrial steam supply in the utility model;

[0022] Figure 6 This is a partial enlarged view of the rear bearing box of the present utility model;

[0023] Figure 7 It is a schematic diagram of the gap between the upper shell and the lower shell of the present utility model. DETAILED DESCRIPTION

[0024] Specific embodiment 1: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, comprising a 1# partition 1, a 2# partition 2, a 3# partition 3, a 4# partition 4, a 5# partition 5, a 6# partition 6, a casing 7, a rotor 10, a front bearing box 11, a rear bearing box 12, a front support bearing 13, a rear support bearing 14 and a base frame 18;

[0025] The front bearing box 11, the casing 7 and the rear bearing box 12 are arranged on the base frame 18 in sequence from front to back. The rotor 10 is arranged in the casing 7. The front end of the rotor 10 is connected to the front bearing box 11 through the front support bearing 13, and the rear end of the rotor 10 is connected to the rear bearing box 12 through the rear support bearing 14. The 1# partition 1, 2# partition 2, 3# partition 3, 4# partition 4, 5# partition 5 and 6# partition 6 are fixed on the inner wall of the casing 7 in sequence from front to back. A front steam seal 8 is provided between the rotor 10 and the front end of the casing 7, and a rear steam seal 9 is provided between the rotor 10 and the rear end of the casing 7. Five impellers are fixed on the rotor 10. The rotor 10 passes through the 1# partition plate 1, 2# partition plate 2, 3# partition plate 3, 4# partition plate 4, 5# partition plate 5 and 6# partition plate 6. Each impeller is arranged between two adjacent elements among the 1# partition plate 1, 2# partition plate 2, 3# partition plate 3, 4# partition plate 4, 5# partition plate 5 and 6# partition plate 6.

[0026] In this embodiment, five impellers are mounted on the rotor to form the first to fifth stage impellers. The first to fifth stage impellers, spacer sleeves, and balance discs are sequentially shrink-fitted onto the main shaft and secured with locknuts. The thrust disc is mounted on the end of the main shaft near the thrust bearing and secured with a thrust disc key and locknut. Together, these components form the rotor.

[0027] The 1# partition, 2# partition, 3# partition, 4# partition, 5# partition and 6# partition are all fitted with stoppers on the casing, and are fixed to the casing by anti-rotation screws to prevent the 1# partition, 2# partition, 3# partition, 4# partition, 5# partition and 6# partition from turning over;

[0028] The gradually contracting flow passage formed between any two elements of the 1# partition, 2# partition, 3# partition, 4# partition, 5# partition and 6# partition constitutes a vaneless diffuser with a streamlined structure;

[0029] That is, the compressor adopts a single-shaft 5-stage centrifugal compression scheme, without intercooling, and is arranged downstream. The working medium is water vapor, the outlet steam flow rate is 60t / h, the rated operating steam inlet pressure is 0.700MPa, the inlet steam temperature is 215℃, the rated outlet pressure is 1.512MPa, and the rated speed is 11680rpm; the compressor operating speed range is 9260rpm-12030rpm, and the unit adopts a variable speed adjustment method. When the inlet pressure fluctuates within the range of 0.667MPa-1.000MPa, the outlet pressure is maintained at 1.5MPa, and the highest speed corresponds to the lowest inlet pressure. In short, the number of stages of the centrifugal steam compressor can be increased to 5, which effectively improves the pressure ratio of the centrifugal steam compressor and can increase the superheated steam at the inlet of 0.7MPa to 1.5MPa, greatly increasing the steam pressure and operating safely and stably at higher temperatures. At the same time, it can increase the temperature rise of the centrifugal steam compressor and can increase the inlet 215℃ steam to 330℃, greatly increasing the steam temperature.

[0030] The casing, front steam seal and rear steam seal together constitute the stator components;

[0031] The front bearing box and the rear bearing box are both fixed to the base frame;

[0032] The bearing box and casing adopt a split design, and the bearing box is independently installed on the base frame. This significantly reduces the impact of casing deformation on the bearing elevation from the installation state to the maximum temperature operation state, making the bearing load change and the bearing specific pressure almost unchanged, making the compressor shaft system more stable and the operation safer;

[0033] The front support bearing and the rear support bearing are respectively located in the front bearing box and the rear bearing box and are used to support the rotor.

[0034] Specific embodiment 2: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, wherein a bearing box oil retaining ring 16 is installed at the front end of the front bearing box 11.

[0035] Other implementations are the same as the first specific implementation.

[0036] Specific embodiment three: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, wherein the rear end of the front bearing box 11 and the front end of the rear bearing box 12 are respectively provided with an airtight oil retaining ring 17 , and the airtight oil retaining ring 17 is provided with a connecting air guide pipe 17 - 1 .

[0037] In this embodiment, instrument air of about 0.7 MPa is introduced through the air duct to play an isolation role, preventing high-temperature steam leaking from the shaft end of the casing from leaking into the bearing box, causing the bearing temperature to rise sharply and deteriorating the quality of the lubricating oil, affecting the safe and stable operation of the unit.

[0038] Other implementations are the same as the second specific implementation.

[0039] Specific embodiment 4: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, the rear end of the rotor 10 is connected to the rear bearing box 12 through a thrust bearing 15, and the rotor 10 expands toward the steam inlet side of the steam compressor with the thrust bearing 15 as the dead point.

[0040] In this embodiment, the rotor expands toward the steam inlet side of the steam compressor with the thrust bearing as the dead point.

[0041] Other implementations are the same as the first specific implementation.

[0042] Specific embodiment 5: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, the casing 7 is connected to the base frame 18 through the bracket 19, the bracket 19 on the exhaust side of the casing 7 steam compressor is a dead point, and expands toward the steam inlet side.

[0043] In this embodiment, the casing is supported by four brackets fixed to a skid-mounted base frame. The casing expands toward the steam inlet side with the exhaust side bracket as the dead point.

[0044] Other implementations are the same as the first specific implementation.

[0045] Specific embodiment 6: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, wherein the impeller tip clearance is zero.

[0046] In this embodiment, a multi-stage closed impeller span-internal connection structure design is adopted, and the blade tip clearance is 0, which reduces inter-stage leakage loss and improves the efficiency of each stage. Compared with the steam compressor with a gear box connection structure, the structure is simpler.

[0047] Other implementations are the same as the first specific implementation.

[0048] Specific embodiment seven: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, a center key 20 is provided at the middle of the rear end of the front bearing box 11 and the middle of the front end of the rear bearing box 12, and the front bearing box 11 and the rear bearing box 12 are respectively connected to the casing 7 through a center key 20.

[0049] In this embodiment, the front bearing box and the rear bearing box are respectively connected to the casing via a central key, and the three do not form a rigid connection, so the connection will not break due to violent movement of the compressor.

[0050] Other implementations are the same as the first specific implementation.

[0051] Specific embodiment eight: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, with an "I"-shaped balance drum 24 provided at the outlet of the casing 7.

[0052] In this embodiment, an I-shaped balancing drum is provided at the outlet of the steam compressor, and the pressure behind the balancing drum is connected to the inlet of the steam compressor. During the variable operating conditions, the axial thrust can be self-balanced in all operating conditions.

[0053] Other implementations are the same as the first specific implementation.

[0054] Specific embodiment 9: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, the casing 7 is composed of an upper casing 7-1 and a lower casing 7-2, and the sealing areas of the upper casing 7-1 and the lower casing 7-2 and the low points of the casing 7 are provided with drain holes 21.

[0055] In this embodiment, drain holes are provided at the sealing area and the low point of the casing to ensure that liquid is discharged from the cylinder when the machine is started or stopped.

[0056] Other implementations are the same as the first specific implementation.

[0057] Specific embodiment ten: A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, wherein a sealing key 22 is designed between the upper shell 7-1 and the lower shell 7-2, and the gap between the upper shell 7-1 and the lower shell 7-2 is filled with sealing grease 23.

[0058] In this embodiment, a sealing key is designed at the center dividing surface of the casing, which is combined with sealing grease to effectively reduce the amount of steam leakage at the center dividing surface and improve the efficiency of the compressor.

[0059] Other implementations are the same as the ninth implementation.

[0060] 1. The utility model overcomes the difficulties of the existing technology and can increase the number of stages of the centrifugal steam compressor to 5, effectively improving the pressure ratio of the centrifugal steam compressor, and can boost the superheated steam at the inlet of 0.7MPa to 1.5MPa, greatly increasing the steam pressure.

[0061] 2. The utility model can operate safely and stably at higher temperatures, and at the same time can increase the temperature rise of the centrifugal steam compressor, and can increase the inlet 215°C steam temperature to 330°C, greatly increasing the steam temperature.

[0062] 3. This utility model can be applied to larger capacity steam compression. Under the designed working conditions, it can compress 60t / h of superheated steam.

[0063] 4. The utility model can achieve a wide range of inlet parameter fluctuations (0.667MPa / 210℃-1.0MPa / 265℃) through frequency conversion regulation while maintaining the outlet pressure at the rated pressure.

[0064] 5. The utility model can ensure that the outlet pressure is maintained at the rated pressure by adjusting the compressor speed under the volume flow fluctuation of 80%-103%.

[0065] 6. The multi-stage closed impeller span inner connection structure design is adopted, and the blade tip clearance is 0, which reduces the inter-stage leakage loss and improves the efficiency of each stage. Compared with the steam compressor with gear box connection structure, the structure is simpler. Figure 3 .

[0066] 7. Use bladeless diffuser solution to simplify the structure, see Figure 1 ;

[0067] 8. The bearing box and casing are designed to be split, with the bearing box independently mounted on the base frame. This significantly reduces the impact of casing deformation on the bearing elevation from the installation state to the maximum temperature operation state, making the bearing load change and the bearing specific pressure almost unchanged, making the compressor shaft system more stable and the operation safer.

[0068] 9. The oil retaining ring of the bearing box close to the casing is an airtight oil retaining ring. The instrument air of about 0.7Mpa is introduced through the pipe on the top of the oil retaining ring to play an isolation role, preventing the high-temperature steam leaking from the shaft end of the casing from leaking into the bearing box, causing the bearing temperature to rise sharply and deteriorating the quality of the lubricating oil, affecting the safe and stable operation of the unit. Figure 5 ;

[0069] 10. A shaped balance drum is installed at the outlet of the steam compressor. The pressure behind the balance drum is connected to the inlet of the steam compressor. During the variable operating conditions, the axial thrust can be self-balanced in all operating conditions.

[0070] 11. The bearing box and the casing are designed to be separated. The oil retaining ring of the bearing box close to the casing is an airtight oil retaining ring to prevent the high-temperature steam leaking from the shaft end from leaking into the bearing box. Figure 5 ;

[0071] 12. A sealing key is designed at the center dividing surface of the casing, which, when used with sealing grease, effectively reduces steam leakage at the center dividing surface and improves compressor efficiency.

[0072] 13. There are drain holes at the sealing area and the lower point of the casing to ensure that the liquid is discharged from the cylinder when starting or stopping. Figure 1 ;

[0073] 14. The whole set is delivered in skid-mounted style. All parts are assembled in the equipment manufacturer and can be directly transported to the site to connect the anchor bolts, which reduces the workload on site. Figure 2 ;

[0074] 15. Refer to the slide pin system diagram of the unit (see Figure 4The front and rear bearing boxes are fixed to the skid-mounted base frame. A center key is installed between the bearing box and the casing. The thrust bearing is placed in the rear bearing box. The rotor expands toward the steam inlet side with the thrust bearing as the dead center. The cylinder is supported by four brackets fixed to the skid-mounted base frame. The cylinder expands toward the steam inlet side with the exhaust-side bracket as the dead center.

[0075] Working principle:

[0076] The compressor adopts a single-shaft, five-stage centrifugal compression scheme, without intercooling, and is arranged downstream. The working medium is water vapor, the outlet steam flow rate is 60t / h, the rated operating steam inlet pressure is 0.700MPa, the inlet steam temperature is 215°C, the rated outlet pressure is 1.512MPa, and the rated speed is 11680rpm. The compressor operating speed range is 9260rpm-12030rpm, the inlet pressure range is 0.667MPa-1.000MPa, and the highest speed corresponds to the lowest inlet pressure. By using a five-stage centrifugal impeller to compress the lower-pressure superheated steam step by step, a large-capacity water vapor temperature and pressure are significantly increased, and high-quality steam is supplied to the outside for industrial use. This utility model can be applied in scenarios with higher temperatures, pressures, and flows, solving the current problems of low capacity, low pressure ratio, and low temperature rise in steam compressors.

Claims

1. A high-parameter multi-stage centrifugal steam compressor for industrial steam supply, characterized by: It comprises a 1# partition (1), a 2# partition (2), a 3# partition (3), a 4# partition (4), a 5# partition (5), a 6# partition (6), a casing (7), a rotor (10), a front bearing box (11), a rear bearing box (12), a front support bearing (13), a rear support bearing (14) and a base frame (18); The front bearing box (11), the housing (7) and the rear bearing box (12) are sequentially arranged on the base frame (18) from front to back. The rotor (10) is arranged in the housing (7). The front end of the rotor (10) is connected to the front bearing box (11) through the front support bearing (13), and the rear end of the rotor (10) is connected to the rear bearing box (12) through the rear support bearing (14); the 1# partition (1), the 2# partition (2), the 3# partition (3), the 4# partition (4), the 5# partition (5) and the 6# partition (6) are sequentially fixed on the inner wall of the housing (7) from front to back. A front steam seal (8) is provided between the rotor (10) and the front end of the casing (7), a rear steam seal (9) is provided between the rotor (10) and the rear end of the casing (7), five impellers are fixed on the rotor (10), and the rotor (10) passes through the 1# partition (1), the 2# partition (2), the 3# partition (3), the 4# partition (4), the 5# partition (5) and the 6# partition (6), and each impeller is provided between two adjacent elements among the 1# partition (1), the 2# partition (2), the 3# partition (3), the 4# partition (4), the 5# partition (5) and the 6# partition (6).

2. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 1, characterized in that: A bearing box oil retaining ring (16) is installed at the front end of the front bearing box (11).

3. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 2, characterized in that: An airtight oil retaining ring (17) is respectively installed at the rear end of the front bearing box (11) and the front end of the rear bearing box (12). A connecting air guide pipe (17-1) is installed on the airtight oil retaining ring (17).

4. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 1, characterized in that: The rear end of the rotor (10) is connected to the rear bearing box (12) via a thrust bearing (15). The rotor (10) expands toward the steam inlet side of the steam compressor with the thrust bearing (15) as a dead point.

5. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 4, characterized in that: The casing (7) is connected to the base frame (18) through a bracket (19). The bracket (19) on the exhaust side of the steam compressor of the casing (7) is a dead point and expands toward the steam inlet side.

6. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 1, characterized in that: The impeller tip clearance is zero.

7. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 1, characterized in that: A center key (20) is provided at the middle of the rear end of the front bearing box (11) and the middle of the front end of the rear bearing box (12). The front bearing box (11) and the rear bearing box (12) are connected to the casing (7) via a center key (20) respectively.

8. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 1, characterized in that: An I-shaped balancing drum (24) is provided at the outlet of the casing (7).

9. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 1, characterized in that: The casing (7) is composed of an upper casing (7-1) and a lower casing (7-2) assembled together. The sealing areas of the upper casing (7-1) and the lower casing (7-2) and the low point of the casing (7) are both provided with hydrophobic holes (21).

10. The high-parameter multi-stage centrifugal steam compressor for industrial steam supply according to claim 9, characterized in that: A sealing key (22) is designed between the upper shell (7-1) and the lower shell (7-2), and the gap between the upper shell (7-1) and the lower shell (7-2) is filled with sealing grease (23).

Images