Double-drive energy recovery circulating water delivery pump set and circulating water delivery system

Abstract

The utility model relates to the technical field of industrial circulating water conveying system, especially to a kind of double-drive energy recovery circulating water conveying pump set and circulating water conveying system, and conveying pump set includes double shaft extension permanent magnet motor, centrifugal pump and hydraulic turbine pump, double shaft extension permanent magnet motor is controlled by frequency converter system with 50Hz operating condition under the function of undisturbed exit, double shaft extension permanent magnet motor includes motor output shaft extension and motor input shaft extension, centrifugal pump is set to the side of motor output shaft extension and is driven by motor output shaft extension, and hydraulic turbine pump is set to the side of motor input shaft extension and drives motor input shaft extension.Using the double-drive energy recovery circulating water conveying pump set to the existing already running circulating water conveying pump set and pipe network system implements energy-saving reconstruction operation or newly built circulating water conveying pump set and pipe network system implements energy-saving operation, can be equivalent to make open or closed circulating water conveying system operation energy consumption reduce more than 40%, with remarkable energy-saving effect.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial circulating water conveying systems, and in particular to a dual-drive energy recovery circulating water conveying pump set and circulating water conveying system. Background Technology

[0002] Currently, there is a certain level of technological accumulation in the recovery and utilization of residual pressure energy in industrial circulating water conveying systems. For example, Chinese utility model patent application number 201520427950.2 discloses a dual-drive regenerative circulating water pump unit capable of recovering residual pressure energy from the return water, and Chinese invention patent application number 201510343884.5 discloses a closed-loop recovery circulating water conveying system and its operation method for residual pressure energy from the return water. Both patents involve "dual-drive regenerative circulating water pump units," which can effectively recover and utilize residual pressure energy from the return water to reduce the energy consumption of circulating water conveying operations.

[0003] However, the "energy storage flywheel" and "bearing housing" in the "dual-drive regenerative circulating water pump unit" require a large installation space. Due to site conditions, the construction and modification costs are high, making promotion difficult. Furthermore, as the residual pressure energy of the recovered water is input into the motor shaft system, the motor's operating load rate drops significantly, and the operating efficiency of the asynchronous motor at its operating point decreases significantly. This results in some of the recovered residual pressure energy being wasted by the inefficiently operating asynchronous motor. Problems such as low energy conversion efficiency in areas where the motor's operating point is far from the rated high efficiency point, multiple system failure points, and poor stability limit its widespread application in industrial circulating water conveying systems.

[0004] Therefore, developing a dual-drive energy recovery circulating water pump set with a compact structure, stable operation, high energy recovery efficiency, and high motor operating efficiency, as well as a circulating water conveying system using this pump set, is of great significance for improving the overall efficiency of industrial circulating water conveying systems and reducing energy consumption. Utility Model Content

[0005] To address the limitations of on-site installation space and the need to improve motor operating efficiency in existing technologies, this utility model provides a dual-drive energy recovery circulating water pump set and circulating water conveying system.

[0006] In a first aspect, this utility model provides a dual-drive energy recovery circulating water pump set, which adopts the following technical solution:

[0007] The dual-drive energy recovery circulating water transfer pump set includes a dual-shaft permanent magnet motor, a centrifugal pump, and a hydraulic turbine pump. The dual-shaft permanent magnet motor is controlled by a frequency converter system with a 50Hz uninterrupted shutdown function. The dual-shaft permanent magnet motor includes a motor output shaft extension and a motor input shaft extension. The centrifugal pump is located on one side of the motor output shaft extension and is driven by the motor output shaft extension. The hydraulic turbine pump is located on one side of the motor input shaft extension and drives the motor input shaft extension. The hydraulic turbine pump includes a turbine pump body. The motor input shaft extension extends into the turbine pump body and is sealed by a rotary sealing mechanism. The turbine pump body is equipped with a turbine pump impeller mounted on the motor input shaft extension. The rotary sealing mechanism is a magnetohydrodynamic seal. The hydraulic turbine pump is equipped with adjustable inlet guide vanes.

[0008] By adopting the above technical solution, the dual-drive energy recovery circulating water pump set recovers residual pressure energy from the circulating water system through a hydraulic turbine pump, and transfers the recovered residual pressure energy to a dual-shaft permanent magnet motor. The dual-shaft permanent magnet motor then coaxially transmits the recovered residual pressure energy and grid energy to a centrifugal pump, thereby realizing the recovery and utilization of residual pressure energy and the transportation of circulating water. The dual-drive energy recovery circulating water pump set has high flexibility and adaptability. Whether it is an open or closed circulating water transportation system, the pump set can be quickly installed and operated through simple pipeline connections and valve adjustments. The pump set has a compact structure, and the adjustable inlet guide vanes can adjust the flow rate and inlet pressure of the hydraulic turbine pump to near the rated operating point, which is convenient for actual operation. The use of a dual-shaft permanent magnet motor greatly reduces the space requirements of the installation environment, ensures stable operation, and reduces the number of failure points. Through the 50Hz uninterrupted frequency converter system control, the operating point of the motor is optimized, the energy recovery efficiency is improved, and the energy consumption of circulating water transportation is greatly reduced. It is conducive to the low-cost recovery and utilization of residual pressure energy in the circulating water system, thereby significantly reducing the cost of new construction or renovation and operating costs. It can be widely used in various new open or closed circulating water transportation systems.

[0009] Practice has proven that using this dual-drive energy recovery circulating water pump set to implement energy-saving retrofits on existing circulating water pump sets and pipeline systems, or to implement energy-saving operation on newly built circulating water pump sets and pipeline systems, can effectively reduce the energy consumption of open or closed circulating water transport systems by more than 40%, demonstrating significant energy-saving and consumption-reducing effects, thus achieving green and sustainable development. Moreover, it represents a significant improvement and application value compared to conventional circulating water pump sets and the "dual-drive energy recovery circulating water pump unit" in existing patented technologies.

[0010] Optionally, the dual-shaft extended permanent magnet motor is a high-voltage self-starting horizontal wide-area high-efficiency permanent magnet motor.

[0011] Optionally, the single-stage double-suction centrifugal pump is a horizontal single-stage double-suction centrifugal pump.

[0012] Optionally, the dual-shaft permanent magnet motor, single-stage double-suction centrifugal pump, and hydraulic turbine pump can be installed independently on the concrete foundation.

[0013] Optionally, the dual-shaft permanent magnet motor, single-stage double-suction centrifugal pump, and hydraulic turbine pump are integrated and mounted on a skid-mounted base.

[0014] Secondly, this utility model provides a circulating water conveying system, which adopts the following technical solution:

[0015] The circulating water delivery system includes a dual-drive energy recovery circulating water delivery pump set, as well as a water supply unit, a main water supply pipe, a water-cooled heat exchanger set for the plant area, and a return water main pipe connected in sequence. A high-pressure branch main pipe and a low-pressure manifold main pipe are connected in sequence on the return water main pipe in the direction of water flow. A centrifugal pump is connected between the water supply unit and the main water supply pipe, and a hydraulic turbine pump is connected between the high-pressure branch main pipe and the low-pressure manifold main pipe. A three-way switching valve set for the return water main pipe is installed at the connection of the return water main pipe, the high-pressure branch main pipe, and the low-pressure manifold main pipe.

[0016] By adopting the above technical solution, when the dual-drive energy recovery circulating water pump set is used as a backup pump set for an operating open or closed circulating water system for the first time, the high-pressure return water in the return water main pipe is first introduced into the hydraulic turbine pump through the three-way switching valve group of the return water main pipe. Then, the flow rate and inlet pressure of the hydraulic turbine pump are adjusted to near the rated operating point. When the motor input shaft extension power is close to the design rated value, the dual-shaft extension permanent magnet motor is started directly (or through the frequency converter). The dual-shaft extension permanent magnet motor starts to run with a lower starting current and eventually drives the centrifugal pump to run at the rated speed with a lower operating current. This realizes the closed-loop recovery and online utilization of the residual pressure energy of the circulating water, and significantly reduces the energy consumption of the circulating water system.

[0017] When the dual-drive energy recovery circulating water pump set is used as the first start-up pump set of a newly built open or closed circulating water system, the dual-shaft permanent magnet motor is started at a low frequency through the frequency converter. The speed is gradually increased and the return water in the return water main is introduced into the hydraulic turbine pump. During the process of adjusting the operating frequency of the dual-shaft permanent magnet motor to 50Hz, the flow rate and inlet pressure of the hydraulic turbine pump are adjusted to the rated operating point. When the motor input shaft extension power reaches the design rated value, the dual-shaft permanent magnet motor starts to drive the centrifugal pump to run at the rated speed with a lower operating current. This realizes the closed-loop recovery and online utilization of the residual pressure energy of the circulating water, and significantly reduces the energy consumption of the circulating water system.

[0018] Optionally, a pressure stabilizing valve assembly is installed between the high-pressure shunt bus and the low-pressure manifold.

[0019] By adopting the above technical solution, the pressure stabilizing valve group is used to automatically stabilize the operating pressure of the return water main when the pump group is switched.

[0020] Optionally, if it is an open circulating water delivery system, the water supply unit includes an open cooling tower group and a water intake pool that are interconnected; if it is a closed circulating water delivery system, the water supply unit includes a closed plate heat exchanger group and a main outlet pipe that are interconnected. Attached Figure Description

[0021] Figure 1 This is a front view of the dual-drive energy recovery circulating water pump set according to an embodiment of the present invention.

[0022] Figure 2 This is a top view of the dual-drive energy recovery circulating water pump set according to an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of an open circulating water conveying system according to an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of a closed-loop circulating water conveying system according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached drawings: 1. Dual-shaft permanent magnet motor; 10. Motor stator; 11. Motor output shaft extension; 12. Motor input shaft extension; 2. Single-stage double-suction centrifugal pump; 20. Centrifugal pump body; 21. Centrifugal pump shaft extension; 22. Centrifugal pump inlet; 23. Centrifugal pump outlet; 24. Centrifugal pump inlet pipe; 25. Centrifugal pump outlet pipe; 26. Inlet valve 1; 27. Outlet valve 1; 3. Hydraulic turbine pump; 30. Turbine pump body; 31. Turbine pump impeller; 32. Turbine pump inlet; 33. Turbine pump outlet... 34. Rotary sealing mechanism; 35. Adjustable inlet guide vane; 36. Turbine pump inlet pipe; 37. Turbine pump outlet pipe; 38. Inlet valve II; 39. Outlet valve II; 4. Coupling; 5. Water supply unit; 50. Open cooling tower assembly; 51. Suction tank; 52. Closed plate heat exchanger assembly; 53. Outlet main pipe; 6. Supply main pipe; 7. Water-cooled heat exchanger assembly in the plant area; 8. Return main pipe; 80. High-pressure branch main pipe; 81. Low-pressure manifold main pipe; 82. Return main pipe three-way switching valve assembly; 83. Pressure stabilizing valve assembly. Detailed Implementation

[0026] The following combination Figures 1-4 The present invention will be described in further detail below.

[0027] This utility model discloses a dual-drive energy recovery circulating water pump set and a circulating water conveying system. (Refer to...) Figure 1 and Figure 2The dual-drive energy recovery circulating water pump set includes a dual-shaft permanent magnet motor 1, a single-stage double-suction centrifugal pump 2, and a hydraulic turbine pump 3. The three can be installed independently on a concrete foundation or integrated on a skid-mounted foundation. In this embodiment, the dual-shaft permanent magnet motor 1 is a high-voltage self-starting horizontal wide-range high-efficiency permanent magnet motor, which is controlled by a frequency converter system with a 50Hz uninterrupted shutdown function.

[0028] Reference Figure 1 and Figure 2 The dual-shaft permanent magnet motor 1 includes a motor body stator 10, a motor output shaft extension 11, and a motor input shaft extension 12. A single-stage double-suction centrifugal pump 2 is disposed on one side of the dual-shaft permanent magnet motor 1. In this embodiment, the single-stage double-suction centrifugal pump 2 is a horizontal single-stage double-suction centrifugal pump, which includes a centrifugal pump body 20, a centrifugal pump shaft extension 21, a centrifugal pump inlet 22, and a centrifugal pump outlet 23. The centrifugal pump shaft extension 21 is connected to the motor output shaft extension 11 via a coupling 4.

[0029] Reference Figure 1 and Figure 2 The hydraulic turbine pump 3 is located on the other side of the dual-shaft permanent magnet motor 1. The hydraulic turbine pump 3 includes a turbine pump body 30, a turbine pump impeller 31, a turbine pump inlet 32, a turbine pump outlet 33, a rotary sealing mechanism 34, and an adjustable inlet guide vane 35. The turbine pump inlet 32 ​​is perpendicular to the turbine pump outlet 33. The motor input shaft extension 12 extends into the turbine pump body 30. The turbine pump impeller 31 is mounted on the motor input shaft extension 12. The rotary sealing mechanism 34 adopts a magnetohydrodynamic seal and is located between the motor input shaft extension 12 and the turbine pump body 30. The adjustable inlet guide vane 35 is mounted on the turbine pump body 30.

[0030] Reference Figure 3 and Figure 4 The circulating water conveying system using this dual-drive energy recovery circulating water conveying pump set also includes a water supply unit 5, a main water supply pipe 6, a water-cooled heat exchanger group 7 for the plant area, and a return water main pipe 8; multiple sets of dual-drive energy recovery circulating water conveying pump sets are connected in parallel. When the circulating water conveying system is open, the water supply unit 5 includes an open cooling tower group 50 and a water intake pool 51 that are interconnected; when the circulating water conveying system is closed, the water supply unit 5 includes a closed plate heat exchanger group 52 and a main outlet water pipe 53 that are interconnected.

[0031] Reference Figure 3 and Figure 4A centrifugal pump inlet pipe 24 connects the centrifugal pump inlet 22 to the water supply unit 5, and a centrifugal pump outlet pipe 25 connects the centrifugal pump outlet 23 to the main water supply pipe 6. An inlet valve 26 is installed on the centrifugal pump inlet pipe 24, and an outlet valve 27 is installed on the centrifugal pump outlet pipe 25. The water-cooled heat exchanger group 7 in the unit area is installed between the main water supply pipe 6 and the main return water pipe 8. The outlet end of the main return water pipe 8 is connected to the water supply unit 5. A high-pressure branch main pipe 80 and a low-pressure manifold main pipe 81 are connected sequentially on the main return water pipe 8 in the direction of water flow.

[0032] Reference Figure 3 and Figure 4 A turbine pump inlet pipe 36 is connected between the turbine pump inlet 32 ​​and the high-pressure branch main pipe 80, and a turbine pump outlet pipe 37 is connected between the turbine pump outlet 33 and the low-pressure manifold main pipe 81. An inlet valve 38 is installed on the turbine pump inlet pipe 36, and an outlet valve 39 is installed on the turbine pump outlet pipe 37. A return water main pipe three-way switching valve group 82 is installed at the connection of the high-pressure branch main pipe 80, the low-pressure manifold main pipe 81 and the return water main pipe 8, and a pressure stabilizing valve group 83 is installed between the high-pressure branch main pipe 80 and the low-pressure manifold main pipe 81 to automatically stabilize the operating pressure of the return water main pipe 8 when the pump group switches.

[0033] When the dual-drive energy recovery circulating water pump set is started for the first time as a backup pump set in an operating open or closed circulating water system, the high-pressure return water in the return water main pipe 8 is first introduced into the turbine pump inlet 32 ​​through the three-way switching valve group 82 of the return water main pipe. Then, the flow rate and inlet pressure of the turbine pump inlet 32 ​​are adjusted to near the rated operating point through the adjustable inlet guide vane 35 and the second inlet valve 38. When the power of the motor input shaft extension 12 is close to the design rated value, the dual-shaft extension permanent magnet motor 1 is started directly (or through the frequency converter). The dual-shaft extension permanent magnet motor 1 starts to run with a lower starting current and eventually drives the single-stage double-suction centrifugal pump 2 to run at the rated speed with a lower operating current, thereby realizing the closed-loop recovery and online utilization of the residual pressure energy of the circulating water, and significantly reducing the energy consumption of the circulating water system.

[0034] When the dual-drive energy recovery circulating water pump set is started for the first time as a pump set in a newly built open or closed circulating water system, the dual-shaft extension permanent magnet motor 1 is started at a low frequency through the frequency converter, and the speed is gradually increased. The return water in the return water main pipe 8 is introduced into the turbine pump inlet 32. During the process of adjusting the operating frequency of the dual-shaft extension permanent magnet motor 1 to 50Hz, the flow rate and inlet pressure of the turbine pump inlet 32 ​​are adjusted to the rated operating point through the adjustable inlet guide vane 35 and the second inlet valve 38. When the power of the motor input shaft extension 12 reaches the design rated value, the dual-shaft extension permanent magnet motor 1 starts to drive the single-stage double-suction centrifugal pump 2 to run at the rated speed with a lower operating current, thereby realizing the closed-loop recovery and online utilization of the residual pressure energy of the circulating water, and significantly reducing the energy consumption of the circulating water system.

[0035] In this embodiment of the invention, the dual-drive energy recovery circulating water pump set recovers residual pressure energy from the circulating water system through a hydraulic turbine pump 3, and transmits the recovered residual pressure energy to a dual-shaft permanent magnet motor 1. The dual-shaft permanent magnet motor 1 then transmits the recovered residual pressure energy and grid energy coaxially to a single-stage double-suction centrifugal pump 2, thereby realizing the recovery and utilization of residual pressure energy and the transportation of circulating water. The dual-drive energy recovery circulating water pump set has high flexibility and adaptability. Whether it is an open or closed circulating water transportation system, the pump set can be quickly installed and operated through simple pipeline connections and valve adjustments.

[0036] The dual-drive energy recovery circulating water pump set has a compact structure and adopts a dual-shaft permanent magnet motor, which significantly reduces the space requirements for installation. It operates stably and reduces the number of failure points. The self-starting horizontal wide-area high-efficiency permanent magnet motor significantly improves the motor's operating efficiency. Through the 50Hz uninterrupted frequency converter system control, the motor's operating conditions are optimized, improving energy recovery efficiency and significantly reducing the energy consumption of circulating water transportation. This is conducive to the low-cost recovery and utilization of residual pressure energy in the circulating water system, thereby greatly reducing the cost of new construction or renovation and operating costs. It can be widely used in various new open or closed circulating water transportation systems.

[0037] Practice has proven that using this dual-drive energy recovery circulating water pump set to implement energy-saving retrofits on existing circulating water pump sets and pipeline systems, or to implement energy-saving operation on newly built circulating water pump sets and pipeline systems, can effectively reduce the energy consumption of open or closed circulating water transport systems by more than 40%, demonstrating significant energy-saving and consumption-reducing effects, thus achieving green and sustainable development. Moreover, it represents a significant improvement and application value compared to conventional circulating water pump sets and the "dual-drive energy recovery circulating water pump unit" in existing patented technologies.

[0038] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A dual-drive energy recovery circulating water transfer pump set, characterized in that: The system includes a dual-shaft permanent magnet motor (1), a single-stage double-suction centrifugal pump (2), and a hydraulic turbine pump (3). The dual-shaft permanent magnet motor (1) is controlled by a frequency converter system with a 50Hz uninterrupted shutdown function. The dual-shaft permanent magnet motor (1) includes a motor output shaft extension (11) and a motor input shaft extension (12). The single-stage double-suction centrifugal pump (2) is located on one side of the motor output shaft extension (11) and is driven by the motor output shaft extension (11). The hydraulic turbine pump (3) is located on the side of the motor output shaft extension (12). The input shaft extension (12) is located on one side and drives the motor input shaft extension (12). The hydraulic turbine pump (3) includes a turbine pump body (30). The motor input shaft extension (12) extends into the turbine pump body (30) and is sealed by a rotary sealing mechanism (34). A turbine pump impeller (31) is installed on the motor input shaft extension (12) inside the turbine pump body (30). The rotary sealing mechanism (34) is a magnetohydrodynamic seal. An adjustable inlet guide vane (35) is provided on the hydraulic turbine pump (3).

2. The dual-drive energy recovery circulating water transfer pump set according to claim 1, characterized in that: The dual-shaft extended permanent magnet motor (1) is a high-voltage self-starting horizontal wide-area high-efficiency permanent magnet motor.

3. The dual-drive energy recovery circulating water transfer pump set according to claim 1, characterized in that: The single-stage double-suction centrifugal pump (2) is a horizontal single-stage double-suction centrifugal pump.

4. The dual-drive energy recovery circulating water transfer pump set according to claim 1, characterized in that: The dual-shaft permanent magnet motor (1), the single-stage double-suction centrifugal pump (2) and the hydraulic turbine pump (3) are each independently installed on the concrete foundation.

5. The dual-drive energy recovery circulating water transfer pump set according to claim 1, characterized in that: The dual-shaft permanent magnet motor (1), single-stage double-suction centrifugal pump (2) and hydraulic turbine pump (3) are integrated and installed on a skid-mounted base.

6. A circulating water conveying system, comprising a dual-drive energy recovery circulating water conveying pump set as described in any one of claims 1-5, characterized in that: It also includes a water supply unit (5), a main water supply pipe (6), a water-cooled heat exchanger group (7) and a return water main pipe (8) connected in sequence. The return water main pipe (8) is connected in sequence with a high-pressure branch pipe (80) and a low-pressure manifold pipe (81) in the direction of water flow. A single-stage double-suction centrifugal pump (2) is connected between the water supply unit (5) and the main water supply pipe (6). A hydraulic turbine pump (3) is connected between the high-pressure branch pipe (80) and the low-pressure manifold pipe (81). A three-way switching valve group (82) for the return water main pipe is installed at the junction of the return water main pipe (8), the high-pressure branch pipe (80) and the low-pressure manifold pipe (81).

7. The circulating water conveying system according to claim 6, characterized in that: A pressure stabilizing valve assembly (83) is installed between the high-pressure shunt busbar (80) and the low-pressure manifold (81).

8. The circulating water conveying system according to claim 6, characterized in that: If it is an open circulating water supply system, the water supply unit (5) includes an open cooling tower group (50) and a water intake pool (51) that are interconnected; if it is a closed circulating water supply system, the water supply unit (5) includes a closed plate heat exchanger group (52) and a main outlet pipe (53) that are interconnected.

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