Two-stage series MVR (mechanical vapor recompression) high-temperature-rise vapor compression equipment
Through two-stage series MVR high-temperature steam compression equipment, the problem of insufficient temperature difference in single-stage steam compressors in high boiling point and high flow systems is solved, and stable and efficient steam compression is achieved, expanding the scope of application and reducing energy consumption.
Patent Information
- Application Number
- CN202422881951.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-26
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-11-26
AI Technical Summary
When existing single-stage steam compressors are used to treat systems with increased boiling point and large flow, they cannot provide sufficient temperature difference and cannot meet the evaporation needs, and their scope of application is limited.
A two-stage series MVR high-temperature steam compression equipment is adopted, and the first-stage and second-stage compressors are connected in series, combined with the spray device and bypass pipe, to eliminate steam overheating and control it through an anti-surge valve to improve the stability of the equipment.
The scope of application of steam compressors has been expanded, sufficient temperature difference has been provided, the stability and efficiency of equipment operation have been improved, and energy consumption has been reduced.
Smart Images
Figure CN223293909U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steam compression, in particular to a two-stage series MVR high-temperature steam compression device. Background Art
[0002] MVR stands for Mechanical Vapor Recompression. An advanced evaporation technology, the MVR evaporator utilizes the characteristic that rising water vapor pressure and temperature increase compresses low-quality secondary steam, raising its temperature and pressure to convert it into high-quality steam for reuse. The steam compressor is the core equipment of the MVR evaporation system.
[0003] Currently, a single centrifugal steam compressor can raise the temperature of steam by more than 20 degrees Celsius. For materials with a low boiling point, a single-stage steam compressor can achieve the reuse of secondary steam. However, for systems with materials with a higher boiling point and larger flow requirements, the ability of a single-stage steam compressor to raise the temperature of secondary steam is limited. It cannot provide the effective temperature difference required for evaporation and cannot meet heat exchange and process requirements. Its scope of application is greatly restricted. Utility Model Content
[0004] In order to facilitate the provision of the effective temperature difference required for evaporation and expand the scope of application of the steam compressor, the present application provides a two-stage series MVR high-temperature steam compression device, which is particularly suitable for systems with high material boiling point rise and large evaporation flow requirements.
[0005] The present application provides a two-stage series MVR high-temperature steam compression device that adopts the following technical solution:
[0006] A two-stage series MVR high-temperature steam compression device comprises a steam inlet pipe and a steam outlet pipe, a first-stage compressor and a second-stage compressor are arranged between the steam inlet pipe and the steam outlet pipe, the input end of the first-stage compressor is communicated with the steam inlet pipe, a first-stage spray device installation pipe is arranged between the output end of the first-stage compressor and the input end of the second-stage compressor, a second-stage spray device installation pipe is arranged between the output end of the second-stage compressor and the steam outlet pipe, spray pipes are arranged on both the first-stage spray device installation pipe and the second-stage spray device installation pipe, a bypass pipe is arranged between the steam inlet pipe and the steam outlet pipe, and an anti-surge valve is arranged on the bypass pipe.
[0007] By adopting the above technical solution, the secondary steam discharged from the separator first enters the first-stage compressor through the steam inlet pipe to increase the temperature and pressure, and then the steam output by the first-stage compressor enters the first-stage spray device installation pipe, and the spray pipe sprays heat exchange liquid to the first-stage spray device installation pipe, thereby eliminating the superheat of the steam at the outlet of the first-stage compressor, and then the steam in the first-stage spray device installation pipe enters the second-stage compressor to increase the temperature and pressure again, and the steam after passing through the second-stage compressor enters the second-stage spray device installation pipe, and the spray pipe sprays heat exchange liquid to the second-stage spray device installation pipe, thereby eliminating the superheat of the steam at the outlet of the second-stage compressor, and then the steam in the second-stage spray device installation pipe is discharged from the steam outlet pipe, and the bypass pipe connects the steam inlet pipe and the steam outlet pipe, and the bypass pipe is controlled by the anti-surge valve to reduce the surge of the equipment and improve the stability of the equipment operation. The steam is heated and pressurized in two stages by the first-stage compressor and the second-stage compressor connected in series, so as to achieve the effect of providing the temperature difference required for evaporation and expand the scope of application of the steam compressor.
[0008] Preferably, a first-stage outlet expansion joint is provided in communication with the output end of the first-stage compressor, and a first-stage outlet reducer is provided between the first-stage outlet expansion joint and the first-stage spray device installation pipe. The diameter of the first-stage outlet reducer at one end close to the first-stage compressor is smaller than the diameter of the first-stage outlet reducer at one end close to the first-stage spray device installation pipe. The diameter of the first-stage outlet reducer at one end close to the first-stage compressor is consistent with the diameter of the first-stage outlet expansion joint, and the diameter of the first-stage outlet reducer at one end close to the first-stage spray device installation pipe is consistent with the diameter of the first-stage spray device installation pipe.
[0009] By adopting the above technical solution, the steam output by the first-stage compressor passes through the first-stage outlet expansion joint and the first-stage outlet reducer in sequence and then enters the first-stage spray device installation pipe. The first-stage outlet expansion joint absorbs the thermal deformation and vibration caused by the first-stage compressor on the pipeline, thereby improving the safety and stability of the equipment during operation. The first-stage outlet reducer controls the flow rate of the steam, thereby improving the operating efficiency of the equipment.
[0010] Preferably, a secondary outlet expansion joint is provided in communication with the output end of the secondary compressor, and a secondary outlet reducer is provided between the secondary outlet expansion joint and the secondary spray device installation pipe. The diameter of the secondary outlet reducer at one end close to the secondary compressor is smaller than the diameter of the secondary outlet reducer at one end close to the secondary spray device installation pipe. The diameter of the secondary outlet reducer at one end close to the secondary compressor is consistent with the diameter of the secondary outlet expansion joint, and the diameter of the secondary outlet reducer at one end close to the secondary spray device installation pipe is consistent with the diameter of the secondary spray device installation pipe.
[0011] By adopting the above technical solution, the steam output by the secondary compressor passes through the secondary outlet expansion joint and the secondary outlet reducer in sequence and then enters the secondary spray device installation pipe. The secondary outlet expansion joint absorbs the thermal deformation and vibration caused by the secondary compressor on the pipeline, thereby improving the safety and stability of the equipment during operation. The secondary outlet reducer controls the flow rate of the steam, thereby improving the operating efficiency of the equipment.
[0012] Preferably, a first-stage filter is provided between the input end of the first-stage compressor and the steam inlet pipe, and a second-stage filter is provided between the input end of the second-stage compressor and the first-stage spray device installation pipe.
[0013] By adopting the above technical solution, the primary filter and the secondary filter prevent foreign matter and a small amount of droplets entrained in the steam from entering the compressor, thereby improving the safety and stability of the equipment during operation.
[0014] Preferably, a first-stage inlet expansion joint is provided between the input end of the first-stage compressor and the first-stage filter, and a second-stage inlet expansion joint is provided between the input end of the second-stage compressor and the second-stage filter.
[0015] By adopting the above technical solution, the first-stage inlet expansion joint absorbs the thermal deformation and vibration caused by the first-stage compressor to the pipeline, and the second-stage inlet expansion joint absorbs the thermal deformation and vibration caused by the second-stage compressor to the pipeline, thereby improving the safety and stability of the equipment during operation.
[0016] Preferably, a first-level inlet reducer is provided between the first-level inlet expansion joint and the first-level filter, the diameter of the first-level inlet reducer near the steam inlet pipe is larger than the diameter of the first-level inlet reducer near the first-level compressor, the diameter of the first-level inlet reducer near the steam inlet pipe is consistent with the diameter of the output end of the first-level filter, and the diameter of the first-level inlet reducer near the first-level compressor is consistent with the diameter of the first-level inlet expansion joint.
[0017] By adopting the above technical solution, the first-level inlet reducer can facilitate the installation of filters with larger diameters. At the same time, the first-level inlet reducer controls the flow rate of steam, thereby improving the operating efficiency of the equipment.
[0018] Preferably, a series pipe is provided between the secondary inlet expansion joint and the secondary filter, the bottom of the series pipe is provided with a drainage tank, the bottom of the drainage tank is provided with a cone, the bottom of the cone is provided with a drainage pipe, and a drainage valve is provided on the drainage pipe.
[0019] By adopting the above technical solution, the condensed water generated during the steam circulation process enters the drainage tank and is discharged from the equipment in time through the drainage pipe, preventing droplets from entering the compressor and affecting the normal operation of the equipment.
[0020] Preferably, a spray regulating valve is provided on the spray pipe.
[0021] By adopting the above technical solution, the spray regulating valve controls the opening of the spray pipe, and the amount of heat exchange liquid is adjusted by the spray regulating valve, thereby facilitating the elimination of superheat of the steam at the outlet of the first-stage compressor and the second-stage compressor.
[0022] In summary, this application includes at least one of the following beneficial technical effects:
[0023] 1. By arranging the steam inlet pipe, steam outlet pipe, first-stage compressor, second-stage compressor, first-stage spray device installation pipe, second-stage spray device installation pipe, spray, bypass pipe and anti-surge valve, the steam is heated and pressurized in two stages through the first-stage compressor and the second-stage compressor connected in series, so as to achieve the effect of providing the temperature difference required for evaporation, expand the application range of the steam compressor, and is particularly suitable for MVR systems with large flow and high temperature rise;
[0024] 2. Prevent foreign matter and a small amount of liquid droplets entrained in the steam from entering the primary and secondary compressors by setting up primary and secondary filters;
[0025] 3. The condensed water generated during the steam circulation process is discharged from the equipment by installing a series pipe, a drain tank, a cone, a drain pipe and a drain valve;
[0026] 4. The two-stage series MVR high-temperature steam compression equipment of this application is easy to install and operates stably. The two compressors can be precisely adjusted according to the material characteristics of the system, so that the equipment and the system are better matched, thereby improving the operating efficiency of the compressor and the system.
[0027] 5. The two-stage series MVR high-temperature steam compression equipment of this application reduces the design area of the evaporator, saves costs for users, and can save 30% to 40% of energy consumption compared to traditional multi-effect evaporation systems. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a structural diagram of a two-stage series MVR high-temperature steam compression device in an embodiment of the present application.
[0029] Figure 2 yes Figure 1 Enlarged view of part A.
[0030] Figure 3 yes Figure 1 Magnified view of part B.
[0031] Figure 4 It is a cross-sectional view showing the connection relationship between the series pipe and the drainage pipe in the embodiment of the present application.
[0032] Explanation of the accompanying symbols: 1. Steam inlet pipe; 2. First-level filter; 3. First-level inlet reducer; 4. First-level inlet expansion joint; 5. First-level compressor; 6. First-level outlet expansion joint; 7. First-level outlet reducer; 8. First-level spray device installation pipe; 9. Second-level filter; 10. Series pipe; 11. Second-level inlet expansion joint; 12. Second-level compressor; 13. Second-level outlet expansion joint; 14. Second-level outlet reducer; 15. Second-level spray device installation pipe; 16. Steam outlet pipe; 17. Anti-surge valve; 18. Bypass pipe; 19. Spray pipe; 20. Spray regulating valve; 21. Drain tank; 22. Drain valve; 23. Cone; 24. Drain pipe. DETAILED DESCRIPTION
[0033] The following is combined with Figure 1-4 This application is described in further detail.
[0034] The present application embodiment discloses a two-stage series MVR high temperature steam compression device. Figures 1 to 3 , including a steam inlet pipe 1 and a steam outlet pipe 16, with a first-stage compressor 5 and a second-stage compressor 12 installed between the steam inlet pipe 1 and the steam outlet pipe 16. The input end of the first-stage compressor 5 is connected to the steam inlet pipe 1, and a first-stage spray device installation pipe 8 is provided between the output end of the first-stage compressor 5 and the input end of the second-stage compressor 12, and a second-stage spray device installation pipe 15 is provided between the output end of the second-stage compressor 12 and the steam outlet pipe 16. A spray pipe 19 is provided on both the first-stage spray device installation pipe 8 and the second-stage spray device installation pipe 15, and a spray regulating valve 20 is installed on the spray pipe 19. The spray regulating valve 20 controls the opening of the spray pipe 19, and the amount of heat exchange liquid is adjusted by the spray regulating valve 20. A bypass pipe 18 is provided between the steam inlet pipe 1 and the steam outlet pipe 16, and an anti-surge valve 17 is installed on the bypass pipe 18. The secondary steam discharged from the separator first enters the primary compressor 5 through the steam inlet pipe 1 to increase its temperature and pressure. The steam output from the primary compressor 5 then enters the primary spray device installation pipe 8. The spray pipe 19 sprays heat exchange liquid onto the primary spray device installation pipe 8, thereby eliminating the superheat of the steam at the outlet of the primary compressor 5. The steam in the primary spray device installation pipe 8 then enters the secondary compressor 12 to increase its temperature and pressure again. After passing through the secondary compressor 12, the steam enters the secondary spray device installation pipe 15. The spray pipe 19 sprays heat exchange liquid onto the secondary spray device installation pipe 15, thereby eliminating the superheat of the steam at the outlet of the secondary compressor 12. The steam in the secondary spray device installation pipe 15 is then discharged through the steam outlet pipe 16. The bypass pipe 18 connects the steam inlet pipe 1 and the steam outlet pipe 16. The anti-surge valve 17 controls the on / off of the bypass pipe 18, thereby reducing surge in the equipment and improving its operational stability. The steam is heated and pressurized in two stages by the first-stage compressor 5 and the second-stage compressor 12 connected in series, thereby providing the temperature difference required for evaporation and expanding the application range of the steam compressor.
[0035] In order to reduce the situation of liquid droplets and impurities entering the primary compressor 5 and the secondary compressor 12, refer to Figure 1 A primary filter 2 is provided between the input end of the primary compressor 5 and the steam inlet pipe 1, and a secondary filter 9 is provided between the input end of the secondary compressor 12 and the primary spray device mounting pipe 8. The primary and secondary filters 2 and 9 prevent foreign matter and a small amount of liquid droplets entrained in the steam from entering the compressor, thereby improving the safety and stability of the equipment during operation.
[0036] In order to reduce the thermal deformation and vibration of the pipeline, refer to Figure 1 A first-stage inlet expansion joint 4 is provided between the input end of the first-stage compressor 5 and the first-stage filter 2, and a first-stage outlet expansion joint 6 is provided between the output end of the first-stage compressor 5 and the first-stage spray device mounting pipe 8. A second-stage inlet expansion joint 11 is provided between the input end of the second-stage compressor 12 and the second-stage filter 9, and a second-stage outlet expansion joint 13 is provided between the output end of the second-stage compressor 12 and the second-stage spray device mounting pipe 15. The first-stage inlet expansion joint 4 and the first-stage outlet expansion joint 6 absorb the thermal deformation and vibration caused by the first-stage compressor 5 on the pipeline, while the second-stage inlet expansion joint 11 and the second-stage outlet expansion joint 13 absorb the thermal deformation and vibration caused by the second-stage compressor 12 on the pipeline.
[0037] To control the steam flow rate, refer to Figure 1A first-level inlet reducer 3 is provided between the first-level inlet expansion joint 4 and the first-level filter 2. The diameter of the first-level inlet reducer 3 near the steam inlet pipe 1 is larger than the diameter of the first-level inlet reducer 3 near the first-level compressor 5. The diameter of the first-level inlet reducer 3 near the steam inlet pipe 1 is consistent with the diameter of the output end of the first-level filter 2. The diameter of the first-level inlet reducer 3 near the first-level compressor 5 is consistent with the diameter of the first-level inlet expansion joint 4. A first-level outlet reducer 7 is provided between the first-level outlet expansion joint 6 and the first-level spray device installation pipe 8. The diameter of the first-level outlet reducer 7 near the first-level compressor 5 is smaller than the diameter of the first-level outlet reducer 7 near the first-level spray device installation pipe 8. The diameter of the first-level outlet reducer 7 near the first-level compressor 5 is consistent with the diameter of the first-level outlet expansion joint 6. The diameter of the first-level outlet reducer 7 near the first-level spray device installation pipe 8 is consistent with the diameter of the first-level spray device installation pipe 8. A series pipe 10 is provided in communication between the secondary inlet expansion joint 11 and the secondary filter 9. The diameter of the series pipe 10 at the end near the secondary compressor 12 is smaller than the diameter of the series pipe 10 at the end near the secondary filter 9. The diameter of the series pipe 10 at the end near the secondary compressor 12 is consistent with the diameter of the secondary inlet expansion joint 11. The diameter of the series pipe 10 at the end near the secondary filter 9 is consistent with the diameter of the output end of the secondary filter 9. A secondary outlet reducer 14 is provided in communication between the secondary outlet expansion joint 13 and the secondary spray device installation pipe 15. The diameter of the secondary outlet reducer 14 at the end near the secondary compressor 12 is smaller than the diameter of the secondary outlet reducer 14 at the end near the secondary spray device installation pipe 15. The diameter of the secondary outlet reducer 14 at the end near the secondary compressor 12 is consistent with the diameter of the secondary outlet expansion joint 13. The diameter of the secondary outlet reducer 14 at the end near the secondary spray device installation pipe 15 is consistent with the diameter of the secondary spray device installation pipe 15. The primary inlet reducer 3 facilitates installation of the larger-diameter primary filter 2, while the series pipe 10 facilitates installation of the larger-diameter secondary filter 9. The primary inlet reducer 3, primary outlet reducer 7, series pipe 10, and secondary outlet reducer 14 utilize variations in pipe diameter to control the steam flow rate, improving the equipment's operating efficiency.
[0038] In order to improve the stability of equipment operation, refer to Figure 1 and Figure 4 The bottom of the series pipe 10 is connected to a drain tank 21, the bottom of which is connected to a cone 23. The bottom of cone 23 is connected to a drain pipe 24, on which a drain valve 22 is installed. Condensate generated during the steam circulation enters drain tank 21 and is promptly discharged from the equipment through drain pipe 24, preventing droplets from entering the secondary compressor 12 and affecting normal operation of the equipment.
[0039] The implementation principle of a two-stage series MVR high-temperature steam compression device in the embodiment of the present application is as follows: the secondary steam first enters the first-stage filter 2 from the steam inlet pipe 1 for filtration, and the steam filtered by the first-stage filter 2 passes through the first-stage inlet reducer 3 and the first-stage inlet expansion joint 4 in turn and enters the first-stage compressor 5 to increase the temperature and pressure, and then the steam output by the first-stage compressor 5 passes through the first-stage outlet expansion joint 6 and the first-stage outlet reducer 7 in turn and enters the first-stage spray device installation pipe 8. The spray pipe 19 sprays heat exchange liquid to the first-stage spray device installation pipe 8, thereby eliminating the superheat of the steam at the outlet of the first-stage compressor 5. After that, the steam in the first-stage spray device installation pipe 8 enters the second-stage filter 9 for filtration, and the steam filtered by the second-stage filter 9 enters the series pipe 10. The condensed water generated during the steam circulation process enters the drainage tank 21 and is discharged from the equipment in time through the drainage pipe 24. The steam in the series pipe 10 enters the secondary compressor 12 through the secondary inlet expansion joint 11 to increase the temperature and pressure again. After passing through the secondary compressor 12, the steam passes through the secondary outlet expansion joint 13 and the secondary outlet reducer 14 in sequence and enters the secondary spray device installation pipe 15. The spray pipe 19 sprays heat exchange liquid to the secondary spray device installation pipe 15, thereby eliminating the superheat of the steam at the outlet of the secondary compressor 12. The steam in the secondary spray device installation pipe 15 is then discharged from the steam outlet pipe 16. The bypass pipe 18 connects the steam inlet pipe 1 and the steam outlet pipe 16. The anti-surge valve 17 controls the on-off of the bypass pipe 18, thereby reducing the surge of the equipment and improving the stability of the equipment operation. The steam is heated and pressurized in two stages by the series-connected primary compressor 5 and secondary compressor 12, achieving the effect of providing the temperature difference required for evaporation and expanding the application range of the steam compressor.
[0040] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A two-stage series MVR high-temperature steam compression device, comprising a steam inlet pipe (1) and a steam outlet pipe (16), characterized in that: A primary compressor (5) and a secondary compressor (12) are arranged between the steam inlet pipe (1) and the steam outlet pipe (16); the input end of the primary compressor (5) is communicated with the steam inlet pipe (1); a primary spray device installation pipe (8) is arranged between the output end of the primary compressor (5) and the input end of the secondary compressor (12); a secondary spray device installation pipe (15) is arranged between the output end of the secondary compressor (12) and the steam outlet pipe (16); spray pipes (19) are arranged on both the primary spray device installation pipe (8) and the secondary spray device installation pipe (15); a bypass pipe (18) is arranged between the steam inlet pipe (1) and the steam outlet pipe (16); and an anti-surge valve (17) is arranged on the bypass pipe (18).
2. The two-stage series MVR high-temperature steam compression device according to claim 1, characterized in that: The output end of the first-stage compressor (5) is connected to a first-stage outlet expansion joint (6), and a first-stage outlet reducing pipe (7) is connected between the first-stage outlet expansion joint (6) and the first-stage spray device installation pipe (8). The diameter of the first-stage outlet reducing pipe (7) close to the first-stage compressor (5) is smaller than the diameter of the first-stage outlet reducing pipe (7) close to the first-stage spray device installation pipe (8). The diameter of the first-stage outlet reducing pipe (7) close to the first-stage compressor (5) is consistent with the diameter of the first-stage outlet expansion joint (6), and the diameter of the first-stage outlet reducing pipe (7) close to the first-stage spray device installation pipe (8) is consistent with the diameter of the first-stage spray device installation pipe (8).
3. The two-stage series MVR high-temperature steam compression device according to claim 1, characterized in that: The output end of the secondary compressor (12) is connected to a secondary outlet expansion joint (13), and a secondary outlet reducer (14) is connected between the secondary outlet expansion joint (13) and the secondary spray device installation pipe (15). The diameter of the secondary outlet reducer (14) close to the secondary compressor (12) is smaller than the diameter of the secondary outlet reducer (14) close to the secondary spray device installation pipe (15). The diameter of the secondary outlet reducer (14) close to the secondary compressor (12) is consistent with the diameter of the secondary outlet expansion joint (13), and the diameter of the secondary outlet reducer (14) close to the secondary spray device installation pipe (15) is consistent with the diameter of the secondary spray device installation pipe (15).
4. The two-stage series MVR high-temperature steam compression device according to claim 1, characterized in that: A primary filter (2) is provided between the input end of the primary compressor (5) and the steam inlet pipe (1), and a secondary filter (9) is provided between the input end of the secondary compressor (12) and the primary spray device installation pipe (8).
5. The two-stage series MVR high-temperature steam compression device according to claim 4, characterized in that: A first-stage inlet expansion joint (4) is provided between the input end of the first-stage compressor (5) and the first-stage filter (2), and a second-stage inlet expansion joint (11) is provided between the input end of the second-stage compressor (12) and the second-stage filter (9).
6. The two-stage series MVR high-temperature steam compression device according to claim 5, characterized in that: A first-stage inlet reducer (3) is provided between the first-stage inlet expansion joint (4) and the first-stage filter (2). The diameter of the first-stage inlet reducer (3) at one end close to the steam inlet pipe (1) is larger than the diameter of the first-stage inlet reducer (3) at one end close to the first-stage compressor (5). The diameter of the first-stage inlet reducer (3) at one end close to the steam inlet pipe (1) is consistent with the diameter of the output end of the first-stage filter (2). The diameter of the first-stage inlet reducer (3) at one end close to the first-stage compressor (5) is consistent with the diameter of the first-stage inlet expansion joint (4).
7. The two-stage series MVR high-temperature steam compression device according to claim 5, characterized in that: A series pipe (10) is provided between the secondary inlet expansion joint (11) and the secondary filter (9), the bottom of the series pipe (10) is provided with a drainage tank (21), the bottom end of the drainage tank (21) is provided with a cone (23), the bottom end of the cone (23) is provided with a drainage pipe (24), and a drainage valve (22) is provided on the drainage pipe (24).
8. The two-stage series MVR high-temperature steam compression device according to claim 1, characterized in that: A spray regulating valve (20) is provided on the spray pipe (19).