Main feed pump set modular system and steam turbine generator plant

Abstract

The utility model relates to the field of nuclear power plants, and discloses a main water feeding pump set modularization system and a steam turbine generator plant, multiple main water feeding pump sets are arranged in a modularization mode, structural integration, unified arrangement and function collaboration are achieved, and the design efficiency and operation reliability of a main water feeding system of the nuclear power plant are improved. The system comprises a plurality of main water feeding pump sets, the main water feeding pump sets are arranged on the bottom layer of a steam turbine generator plant deoxygenization room in the axial direction of a steam turbine generator, each main water feeding pump set comprises a booster pump, a motor, a hydraulic coupler and a main pump which are sequentially coupled, and the booster pumps are connected with the main pumps through medium-pressure water feeding pipelines. The booster pump is configured to increase the pressure of an inlet of the main pump in advance to prevent the cavitation phenomenon, the hydraulic coupler is configured to transmit the rotating speed of the motor to the main pump to adjust the rotating speed of the main pump, and the main pump is configured to sequentially send feed water in the deaerator in the deaeration room into all stages of high-pressure heaters and finally send the feed water into the nuclear island steam generator.

Description

Technical Field

[0001] This application relates to the field of nuclear power plants, specifically to a modular system for a main feedwater pump set and a steam turbine generator. Background Technology

[0002] In existing technologies, the main feedwater pump units in the conventional island of nuclear power plants are often set up independently as multiple decentralized devices. Their structures lack a unified and integrated combination method, and related equipment, pipelines, foundations, and auxiliary hoisting devices are usually scattered on-site, failing to form modular pump units with structural integrity and functional encapsulation. Especially in multi-pump configurations, existing systems typically lack the ability to be grouped and arranged, hindering the achievement of unified and coordinated installation and functional synergy.

[0003] Therefore, there is an urgent need to propose a modular system for main feedwater pump sets that is compact in structure, integrated in function, and suitable for overall layout, in order to meet the needs of the grouping and modular development of nuclear power main feedwater systems. Summary of the Invention

[0004] The purpose of this application is to provide a modular system for main feedwater pump sets and a turbine generator plant. By modularly arranging multiple main feedwater pump sets, structural integration, unified layout, and functional coordination are achieved, thereby improving the design efficiency and operational reliability of the main feedwater system of a nuclear power plant.

[0005] This application discloses a modular system for main feedwater pump groups, including: multiple main feedwater pump groups, which are arranged along the axial direction of the turbine generator in the bottom layer of the deaerator room of the turbine generator plant. Each main feedwater pump group includes a pre-pump, a motor, a hydraulic coupler and a main pump coupled in sequence, and the pre-pump and the main pump are connected through a medium-pressure feedwater pipeline.

[0006] The pre-pump is configured to pre-increase the pressure at the inlet of the main pump to prevent cavitation. The hydraulic coupler is configured to transmit the rotational speed of the motor to the main pump to adjust the rotational speed of the main pump. The main pump is configured to sequentially send the feedwater from the deaerator in the deaerator room to each stage of high-pressure heaters, and finally to the nuclear island steam generator.

[0007] In a preferred embodiment, the medium-pressure water supply pipeline is provided with a pre-medium-pressure water supply pipeline, which is a branch flow path of the medium-pressure water supply pipeline. The pre-medium-pressure water supply pipeline is configured to guide the liquid in the medium-pressure water supply pipeline to drain during shutdown maintenance.

[0008] In a preferred embodiment, the hydraulic coupling includes:

[0009] The input terminal is used for coupling with the output shaft of the pre-pump via the motor;

[0010] The output end is used for coupling with the main pump input end via a coupling.

[0011] The working chamber, located between the input end and the output end, is used to contain the kinetic fluid;

[0012] A pump wheel is disposed at the input end and rotates with the input end to drive the flow of the kinetic fluid;

[0013] A turbine is located at the output end and transmits torque to the pump impeller through the flow power of the power fluid;

[0014] The outer casing is used to enclose the working chamber and support the pump wheel and turbine.

[0015] In a preferred embodiment, each of the main water supply pump units is provided with a corresponding deep foundation pit below it, and the deep foundation pit is provided with a plurality of anchor bolt holes. The bottom of the main water supply pump unit is fixed to the deep foundation pit by secondary grouting through the anchor bolt holes.

[0016] In a preferred embodiment, the pre-pump and the main pump are driven by the same motor.

[0017] In a preferred embodiment, the pre-pump operates at a constant speed, while the main pump operates at a regulated speed via the hydraulic coupler.

[0018] In a preferred embodiment, a monorail hoisting assembly is provided above each group of main feedwater pump sets for hoisting, maintenance, and replacement operations on the pre-pump, the motor, the hydraulic coupler, and the main pump, respectively. Each group of main feedwater pump sets is aligned with the corresponding monorail hoisting assembly, which includes a transversely arranged monorail hoist and a longitudinally arranged monorail hoist.

[0019] In a preferred embodiment, the deaerator in the deaerator room of the steam turbine generator plant is fluidly connected to the modular system of the main feedwater pump. The water outlet of the deaerator is fed into the inlet of each group of the main feedwater pumps via the main inlet pipe, and the water outlet of the main feedwater pumps is fed into each stage of high-pressure heaters via the main outlet pipe.

[0020] In a preferred embodiment, each main water supply pump group is equipped with a medium-pressure water supply pipeline filter screen on its water supply pipeline. The medium-pressure water supply pipeline filter screen is used to intercept impurity particles in the main water supply. A differential pressure monitoring device is connected before and after the medium-pressure water supply pipeline filter screen. The differential pressure monitoring device is used to monitor the pressure difference across the medium-pressure water supply pipeline filter screen in real time to determine whether the medium-pressure water supply pipeline filter screen is blocked and to send an alarm signal to the upper-level system.

[0021] This application also discloses a steam turbine generator plant, including a modular system of main feedwater pump sets as described above.

[0022] In this embodiment, by integrating multiple main feedwater pump sets into a compact modular unit and arranging them along the turbine generator axis, the system's integration and space utilization are significantly improved. Each main feedwater pump set consists of a booster pump, a motor, a hydraulic coupler, and a main pump, employing a unified connection structure and speed regulation mechanism. This solves the problem of dispersed equipment layout and lack of overall coordination in existing technologies. By increasing the inlet pressure of the main pump through the booster pump, cavitation can be effectively prevented, and the hydraulic coupler enables smooth speed regulation, ensuring the stability and reliability of the entire system during efficient operation. This design not only simplifies equipment installation and maintenance but also reduces the cross-layout of pipelines and equipment in the system through integrated layout, improving space utilization efficiency and system operational safety. It fundamentally solves the problems of poor coordination, equipment redundancy, and large footprint inherent in traditional main feedwater pump set layouts.

[0023] Furthermore, the pre-installed medium-pressure water supply pipeline can guide the liquid in the medium-pressure water supply pipeline to drain during shutdown maintenance, avoiding problems such as liquid stagnation and uneven pressure within the pipeline, ensuring a safer and more efficient maintenance process. The hydraulic coupling adopts a highly efficient torque transmission method, coupling with the pre-pump at the input end and with the main pump at the output end. The flow of kinetic fluid in the working chamber drives the torque transmission between the pump impeller and the turbine, enhancing the system's speed regulation capability and operational stability.

[0024] Furthermore, the main feedwater pump units are fixed in place via deep foundation pits and anchor bolt holes, ensuring system stability and long-term operational reliability. A monorail hoisting assembly above each pump unit, arranged horizontally and vertically, facilitates more convenient and efficient installation, maintenance, and replacement of equipment. The entire system's feedwater pipeline is also equipped with filters and differential pressure monitoring devices, enabling real-time monitoring of the filter's operating status. Upon detecting blockage, an alarm signal is promptly sent to the upper-level system, further enhancing the system's self-diagnostic capabilities and operational safety.

[0025] Furthermore, the modular design of the main feedwater pump unit not only optimizes the equipment's functionality and operability but also significantly improves the efficiency of engineering design and construction. The modular structure allows for the prefabrication of components in the factory with standardized interface designs, greatly simplifying on-site information gathering and installation processes. Through standardized layout and connection methods, the various modules of the system can be quickly and flexibly assembled and adjusted, reducing on-site commissioning and installation time, while also lowering additional costs associated with on-site design changes. In addition, the equipment's hoisting assembly and standardized foundation installation methods make equipment maintenance and replacement operations more convenient, further improving the efficiency of subsequent operation and maintenance.

[0026] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these technical features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described invention, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which are considered to have been described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as described because it is technically infeasible, while the solution A+B+C+E should be considered as described. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the piping and instrumentation flow of a modular system for a main feedwater pump unit according to one embodiment of this application.

[0028] Figure 2 This is a two-dimensional layout schematic diagram of a main feedwater pump unit according to one embodiment of this application.

[0029] Figure 3 This is a two-dimensional arrangement diagram of multiple main feedwater pump sets according to one embodiment of this application.

[0030] Figure 4 This is a civil engineering schematic diagram of multiple main water supply pump sets according to one embodiment of this application.

[0031] Figure 5 This is a civil engineering schematic diagram of multiple main water supply pump sets according to one embodiment of this application. Detailed Implementation

[0032] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0034] The first embodiment of this application relates to a modular system for a main feedwater pump unit, the structural diagram of which is shown below. Figure 1-5As shown, it includes:

[0035] Multiple main feedwater pump sets are arranged axially along the turbine generator on the ground floor of the deaerator compartment in the turbine generator building. Each main feedwater pump set includes a booster pump, a motor, a hydraulic coupler, and a main pump, which are coupled sequentially. The booster pump and the main pump are connected via a medium-pressure feedwater pipeline. The booster pump is configured to pre-increase the pressure at the main pump inlet to prevent cavitation. The hydraulic coupler is configured to transmit the motor's speed to the main pump to regulate its speed. The main pump is configured to sequentially deliver feedwater from the deaerator in the deaerator compartment to each stage of the high-pressure heaters, and finally to the nuclear island steam generator.

[0036] In an optional embodiment, a pre-medium-pressure water supply pipe is provided on the medium-pressure water supply pipeline. The pre-medium-pressure water supply pipe is a branch flow path of the medium-pressure water supply pipeline and is configured to guide the liquid in the medium-pressure water supply pipeline to drain during shutdown and maintenance. Optionally, the outlet end of the pre-medium-pressure water supply pipe is connected to a drainage manifold or drainage well. This drainage manifold structure is set in the deep foundation pit or plant sump where the main water supply pump set is located to centrally discharge the residual liquid discharged by each pump set, avoiding on-site water accumulation or equipment corrosion. Optionally, the pre-medium-pressure water supply pipe adopts a detachable structure, including quick-install flanges, clamp connections, or quick couplings, so that it can be closed or replaced when the drainage channel is not in use, in order to adapt to pump set systems with different layout configurations.

[0037] In an optional embodiment, the hydraulic coupling includes an input end, an output end, a working chamber, a pump impeller, a turbine, and a housing. The input end is used to couple with the output shaft of the pre-pump via a motor. The output end is used to couple with the input end of the main pump via a coupling. The working chamber is located between the input and output ends and is used to contain the kinetic fluid. The pump impeller is located at the input end and rotates with the input end to drive the flow of the kinetic fluid. The turbine is located at the output end and transmits torque to the pump impeller through the flow of the kinetic fluid. The housing is used to enclose the working chamber and support the pump impeller and turbine. Optionally, the input end is located on one side of the hydraulic coupling and is mechanically coupled to the output shaft of the motor, while also forming a coaxial transmission structure with the pre-pump to ensure a compact arrangement of the entire pump system in the axial direction. The output end is located on the side opposite the input end and is connected to the input shaft of the main pump via a coupling, thereby driving the main pump. The working chamber, located between the input and output ends, forms a sealed hydraulic transmission space filled with a certain volume of kinetic fluid (such as transformer oil or special hydraulic oil). Energy transfer between the pump impeller and turbine is completed within this space. The pump impeller is fixedly mounted inside the input end and, as the input end rotates, agitates the kinetic fluid within the working chamber at high speed. The turbine is fixedly mounted inside the output end, opposite the pump impeller. There is no rigid connection between the turbine and the pump impeller; instead, torque transfer from the pump impeller to the turbine is achieved through the centrifugal force and kinetic energy generated by the flow of the kinetic fluid. In this structure, the rotation of the pump impeller throws the liquid outwards, forming a ring-shaped flow field. This flow field impacts the turbine blades, achieving non-contact drive and providing excellent buffering and flexible start-up characteristics. The hydraulic coupler can also be equipped with a liquid guide or adjustable guide vane device on the outer casing to adjust the circulation path and flow rate of the liquid within the working chamber, thereby achieving continuous adjustment of the output speed to meet the operating requirements of the main pump under different load conditions. The outer casing forms an integral enclosed structure, which not only provides mechanical support but also prevents leakage of kinetic fluid and withstands internal pressure changes, ensuring the operational stability of the hydraulic coupling.

[0038] In an optional embodiment, each main feedwater pump unit has a corresponding deep foundation pit beneath it. The deep foundation pit is a customized concrete foundation structure designed for the location of the main feedwater pump unit, with its bottom and sidewalls constructed of high-strength concrete, providing excellent load-bearing capacity and structural rigidity. The dimensions of the deep foundation pit are determined based on the length, width, and weight of the main feedwater pump unit, and the structural design takes into account the vibration loads, impact loads, and thermal expansion requirements generated during pump unit operation. Multiple anchor bolt holes are provided within the deep foundation pit, positioned corresponding to the base of the main feedwater pump unit for installation and positioning. These holes are used for pre-embedding anchor bolts during installation, or for inserting anchor bolts into pre-drilled holes and then anchoring them, achieving precise fixation of the pump unit. After the main feedwater pump unit is placed, secondary grouting is performed around the anchor bolt holes. The grouting material fills the gap between the main pump base and the concrete foundation, forming a complete and tight contact surface, improving connection rigidity and seismic resistance. Secondary grouting can utilize high-strength, non-shrink grouting materials to ensure the long-term stability of the grout layer and prevent loosening or displacement due to foundation settlement or thermal cycling. After grouting is completed and cured to the required strength, the main feedwater pump unit can enter the trial operation phase. This installation structure not only improves the overall installation accuracy and operational stability of the pump unit but also facilitates disassembly and repositioning of the equipment during subsequent maintenance, making it suitable for nuclear power plant main feedwater systems with high precision and high reliability requirements.

[0039] In an optional embodiment, the booster pump and the main pump are driven by the same motor. Specifically, the motor is positioned between the booster pump and the main pump, with one end rigidly connected to the booster pump and the other end connected to the main pump via a hydraulic coupler, forming an integrated drive structure. The booster pump is a constant-speed pump, rigidly connected to the motor output shaft, maintaining a constant speed to create a certain pre-pressurization at the main pump inlet, preventing cavitation in the main pump under high-lift suction conditions. The main pump is connected to the motor via a hydraulic coupler, which dynamically adjusts its output speed according to the main pump's operating conditions, achieving adaptive control of the main pump flow rate and system load. To ensure drive stability, the motor can adopt a double-shaft extension structure, with one end connected to the booster pump via a coupling or rigid connector, and the other end connected to the input end of the hydraulic coupler to drive the main pump. This arrangement ensures the alignment accuracy of the overall pump unit axis, reducing the risk of equipment failure caused by off-center loading or vibration.

[0040] In one optional embodiment, the booster pump operates at a constant speed, while the main pump operates at a variable speed via a hydraulic coupling. Optionally, during system start-up and shutdown, the booster pump can be started first to establish a positive pressure water supply environment, and then the main pump can be adjusted to reach the target flow rate, achieving a soft start and smooth pressure transition, avoiding abnormal operating conditions such as water hammer, and further ensuring the operational safety of the main water supply system.

[0041] In an optional embodiment, a cooler may be provided on the outside of the motor. Specifically, the cooler is connected to the motor housing via a coolant circulation system. The cooler works by absorbing heat from the surface of the motor housing using a circulating coolant (such as water, oil, or a special coolant) and releasing the heat to the environment through a radiator or heat exchanger. The coolant is connected to a cooling port on the motor housing via pipes. As the coolant flows over the surface of the motor housing, it absorbs heat. After passing through the heat exchanger inside the cooler, it releases the heat to the environment and continues to circulate via a water pump or pump. Various types of coolers can be used, including air-cooled and liquid-cooled coolers, the specific choice depending on the system's operating environment and required cooling capacity. Air-cooled coolers use an external fan to force airflow and remove heat, suitable for general low-temperature environments. Liquid-cooled coolers exchange heat with the motor through the flow of coolant, suitable for higher power or high-temperature environments, and can provide a stronger cooling effect.

[0042] In an optional embodiment, a monorail hoisting assembly is installed above each main feedwater pump group for hoisting, maintenance, and replacement operations on the booster pump, motor, hydraulic coupling, and main pump, respectively. Each main feedwater pump group is aligned with its corresponding monorail hoisting assembly, which includes a laterally arranged monorail hoist and a longitudinally arranged monorail hoist. Figure 5 As shown, the transversely arranged monorail crane is positioned along the axial direction of the main feedwater pump set, above the booster pump and main pump. This monorail crane slides laterally via a track system, enabling precise alignment with the equipment lifting points. Its primary function is to lift the booster pump and main pump from their installation location to a designated storage area, or to move the equipment to the maintenance area for further operations during maintenance. The longitudinally arranged monorail crane is positioned between the two transversely arranged monorail cranes within the same main pump set. The longitudinally arranged monorail crane is used to lift the motor and hydraulic coupling to a designated storage area, or to move the equipment to the maintenance area for further operations during maintenance. By staggering the transverse and longitudinal monorail cranes, the lifting system makes better use of space, avoiding potential space waste during unidirectional lifting. This arrangement makes equipment lifting operations more flexible, allowing for more operations to be completed within a limited space.

[0043] In an optional embodiment, the deaerator in the deaerator room of the steam turbine generator plant is fluidly connected to the modular system of the main feedwater pump. The water outlet of the deaerator is fed into the inlet of each main feedwater pump group via the main inlet pipe, and the water outlet of the main feedwater pump group is fed into each stage of high-pressure heaters via the main outlet pipe.

[0044] In an optional embodiment, each main feedwater pump group is equipped with a medium-pressure feedwater pipe filter. The medium-pressure feedwater pipe filter is used to intercept impurities in the main feedwater. A differential pressure monitoring device is connected before and after the medium-pressure feedwater pipe filter. The differential pressure monitoring device is used to monitor the pressure difference across the medium-pressure feedwater pipe filter in real time to determine whether the medium-pressure feedwater pipe filter is blocked and send an alarm signal to the upper-level system. Optionally, a pre-positioned medium-pressure feedwater pipe can form a cooperative structure with the medium-pressure feedwater pipe filter, located in the front and / or rear section of the filter, and working in conjunction with the differential pressure monitoring system. When an abnormal pressure difference is detected in the filter or the system needs to be shut down for maintenance, an automatic drainage logic is triggered to improve fault response capability.

[0045] To better understand the technical solution of this application, a specific example is provided below. The details listed in this example are mainly for ease of understanding and are not intended to limit the scope of protection of this application.

[0046] This application provides a modular system for a main feedwater pump set. The modular design of this system improves the system's integration, ease of installation, operating efficiency, and ease of maintenance.

[0047] In this embodiment, the modular system of main feedwater pump sets includes multiple main feedwater pump sets, each arranged axially along the bottom floor of the deaerator compartment in the turbine generator building. Each main feedwater pump set includes a booster pump, a motor, a hydraulic coupling, and a main pump. The booster pump and the main pump are also tightly connected via a medium-pressure feedwater pipeline. The main function of the booster pump is to provide a stable inlet pressure to the main pump, thereby preventing cavitation. The motor is connected to the main pump via the hydraulic coupling. The output flow rate of the main pump is adjusted by regulating the speed of the hydraulic coupling, thereby meeting the feedwater requirements of the nuclear power plant's steam generator.

[0048] Specifically, the booster pump and main pump are driven by the same motor. The booster pump operates at a constant speed throughout the system, its task being to continuously provide the necessary inlet pressure to the main pump. The main pump, on the other hand, adjusts its speed via a hydraulic coupling to adapt to flow requirements under different load conditions. The hydraulic coupling is coupled to the booster pump's output shaft via its input end, and its output end is connected to the main pump's input end via a coupling. The working chamber is filled with kinetic fluid, and the fluid flow between the pump impeller and turbine completes torque transmission, ensuring stable speed regulation of the main pump.

[0049] To ensure the high efficiency and stability of the system, each main feedwater pump unit is located in a corresponding deep foundation pit. Multiple anchor bolt holes are provided within the deep foundation pit, and secondary grouting secures the bottom of the main pump unit within the pit. This effectively increases the system's stability and prevents displacement of the equipment due to vibration or thermal expansion during operation.

[0050] Above each main feedwater pump unit is a monorail hoisting assembly, which includes monorails arranged laterally and longitudinally. The lateral monorails are mainly used for lateral movement and positioning of the equipment, while the longitudinal monorails are used for precise longitudinal installation. This staggered arrangement maximizes space utilization, improves hoisting efficiency and accuracy, and ensures that hoisting in different directions does not interfere with each other, thus guaranteeing the smooth progress of equipment installation, maintenance, and replacement.

[0051] To improve equipment maintenance and repair efficiency, the system design also includes a pre-connected medium-pressure water supply pipeline. This pipeline serves as a branch path of the existing medium-pressure water supply pipeline, specifically designed to guide liquid discharge during maintenance, preventing liquid stagnation from affecting subsequent operations. The pre-connected medium-pressure water supply pipeline controls the liquid flow rate through regulating valves and avoids impacting other systems during drainage. Its layout ensures efficient operation during equipment maintenance without affecting the overall system operation.

[0052] In addition, each main feedwater pump group is equipped with a filter screen on its medium-pressure feedwater pipeline. This filter screen is used to intercept impurities in the main feedwater, preventing them from entering the system and causing blockages. Differential pressure monitoring devices are installed before and after the filter screen to monitor its operating status in real time. When an abnormality in pressure difference is detected, the system will issue an alarm signal to remind operators to perform maintenance, thereby ensuring the long-term stable operation of the system.

[0053] This embodiment effectively meets the high reliability and high safety requirements of nuclear power plants for the main feedwater system. Through modular design and standardized interfaces, the system enables rapid installation and commissioning, while also providing significant convenience for subsequent inspection and maintenance.

[0054] The second embodiment of this application relates to a steam turbine generator plant that includes a modular main feedwater pump system as described in any of the embodiments above. The steam turbine generator plant is designed based on the standard layout of a conventional island plant, wherein the modular main feedwater pump system is located on the ground floor of the deaerator. The steam turbine generator plant utilizes this modularly designed main feedwater pump system to improve the overall system's operating efficiency, stability, and ease of maintenance.

[0055] The layout of the conventional island powerhouse is briefly described below. On the turbine head side, the ground floor of the conventional island powerhouse houses the main steam header, main steam piping, bypass piping, and related drainage devices. This area also includes two MSR drainage pumps on either side of the high-pressure cylinder, and a vertical drainage expansion tank at the turbine tail, ensuring effective drainage and stable operation of the main steam system. At the generator end, three vacuum pumps, an open-type electric water filter, a tubular water-to-water heat exchanger, and cooling water pumps are installed to ensure normal generator cooling and maintain equipment operation.

[0056] On the ground floor of the deaerator room in the conventional island plant, a start-up feedwater pump, three main feedwater pump sets, and four vertical low-pressure heater condensate pumps are specially arranged. Among them, the modular system of the main feedwater pump sets occupies a core position, providing a stable feedwater supply for the entire turbine generator unit. In order to meet the demand for efficient water supply and cope with equipment maintenance, the modular design of the pump sets enables the system to achieve rapid equipment replacement and maintenance.

[0057] In the intermediate and operating levels of the conventional island plant, the layout of other thermal management and auxiliary systems coordinates with the main feedwater pump unit modular system. For example, in the intermediate level of the turbine hall, equipment such as the turbine generator lubrication oil system, generator sealing oil system, and generator stator cooling water device are closely related to the operation of the main feedwater system, ensuring the stable operation of the turbine and generator. In the intermediate level of the deaerator room, the arrangement of high-pressure and low-pressure heaters provides additional heat exchange for the system, further improving its thermal efficiency and operational capacity. The water supply, drainage, cooling, and heat exchange equipment of the entire main feedwater pump unit modular system are integrated through standardized interfaces and a unified control system. As the core component of the entire water supply system, the main feedwater pump unit modular system works closely with other thermal management equipment in the conventional island plant to achieve efficient water supply and thermal energy utilization.

[0058] This embodiment includes the technical solution of the first embodiment, and the technical details of the first embodiment can be applied to this embodiment.

[0059] It should be noted that in this patent application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this patent application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0060] All documents mentioned in this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the foregoing disclosure of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A modular system of main feed water pump sets, characterized in that, The utility model relates to a main feed water pump module system, comprising: a plurality of main feed water pump groups arranged along the turbine generator shaft on the bottom of the deaerating room of the turbine generator plant, each of the main feed water pump groups comprising a booster pump, a motor, a hydraulic coupler and a main pump coupled in sequence, and the booster pump and the main pump being connected by a medium pressure feed water pipeline; the booster pump is configured to pre-increase the pressure at the inlet of the main pump to prevent cavitation, the hydraulic coupler is configured to transmit the rotational speed of the motor to the main pump to adjust the rotational speed of the main pump, and the main pump is configured to sequentially feed feed water in the deaerator in the deaerating room into high-pressure heaters of different stages and finally into a nuclear island steam generator.

2. The primary feedwater pump set modular system of claim 1, wherein, The medium pressure feed water pipeline is provided with a booster medium pressure feed water pipeline, which is a branch flow path of the medium pressure feed water pipeline and is configured to guide the liquid in the medium pressure feed water pipeline to be discharged during shutdown and maintenance.

3. The main feed water pump group modular system in accordance with claim 1, wherein, The hydraulic coupler comprises: an input end for coupling with the output shaft of the booster pump through the motor; an output end for coupling with the input end of the main pump through a shaft coupling; a working chamber arranged between the input end and the output end for containing power liquid; a pump wheel arranged at the input end and rotating with the input end to drive the power liquid to flow; a turbine arranged at the output end and transmitting torque with the pump wheel through the flow power of the power liquid; an outer shell for enclosing the working chamber and supporting the pump wheel and the turbine.

4. The main feed water pump group modular system in accordance with claim 1, wherein, Each of the main feed water pump groups is provided below with a corresponding deep foundation pit, the deep foundation pit is provided with a plurality of anchor bolt holes, and the bottom of the main feed water pump group is fixed in the deep foundation pit through the secondary grouting of the anchor bolt holes.

5. The main feed water pump group modular system in accordance with claim 1, wherein, The booster pump and the main pump use the same motor for driving.

6. The primary feedwater pump set modular system of claim 1, wherein, The booster pump moves at a constant speed, and the main pump moves at a variable speed through the hydraulic coupler.

7. The primary feedwater pump set modular system of claim 1, wherein, Above each of the main feed water pump groups, a monorail hoisting combination device is arranged for performing hoisting and maintenance replacement operations on the booster pump, the motor, the hydraulic coupler and the main pump respectively, each of the main feed water pump groups is arranged in alignment with the corresponding monorail hoisting combination device, and the monorail hoisting combination device comprises a monorail crane arranged horizontally and a monorail crane arranged longitudinally.

8. The main feed water pump group modular system in accordance with claim 1, wherein, The deaerator in the deaerating room of the turbine generator plant is fluidly coupled with the main feed water pump modular system, the outlet of the deaerator is connected to the inlet of each of the main feed water pump groups through a water inlet main pipe, and the outlet of each of the main feed water pump groups is sequentially connected to high-pressure heaters of different stages through a water outlet main pipe.

9. The primary feedwater pump set modular system of claim 1, wherein, Each of the main feed water pump groups is provided with a medium pressure feed water pipeline filter screen on the feed water pipeline, the medium pressure feed water pipeline filter screen is used for intercepting impurity particles in the main feed water, differential pressure monitoring devices are connected before and after the medium pressure feed water pipeline filter screen, and the differential pressure monitoring devices are used for monitoring the differential pressure between the two ends of the medium pressure feed water pipeline filter screen in real time to determine whether the medium pressure feed water pipeline filter screen is blocked and send an alarm signal to an upper system.

10. A steam turbine generator plant characterized by The utility model relates to a main feed water pump module system, comprising: a plurality of main feed water pump groups arranged along the turbine generator shaft on the bottom of the deaerating room of the turbine generator plant, each of the main feed water pump groups comprising a booster pump, a motor, a hydraulic coupler and a main pump coupled in sequence, and the booster pump and the main pump being connected by a medium pressure feed water pipeline; the booster pump is configured to pre-increase the pressure at the inlet of the main pump to prevent cavitation, the hydraulic coupler is configured to transmit the rotational speed of the motor to the main pump to adjust the rotational speed of the main pump, and the main pump is configured to sequentially feed feed water in the deaerator in the deaerating room into high-pressure heaters of different stages and finally into a nuclear island steam generator. The medium pressure feed water pipeline is provided with a booster medium pressure feed water pipeline, which is a branch flow path of the medium pressure feed water pipeline and is configured to guide the liquid in the medium pressure feed water pipeline to be discharged during shutdown and maintenance. The hydraulic coupler comprises: an input end for coupling with the output shaft of the booster pump through the motor; an output end for coupling with the input end of the main pump through a shaft coupling; a working chamber arranged between the input end and the output end for containing power liquid; a pump wheel arranged at the input end and rotating with the input end to drive the power liquid to flow; a turbine arranged at the output end and transmitting torque with the pump wheel through the flow power of the power liquid; an outer shell for enclosing the working chamber and supporting the pump wheel and the turbine. Each of the main feed water pump groups is provided below with a corresponding deep foundation pit, the deep foundation pit is provided with a plurality of anchor bolt holes, and the bottom of the main feed water pump group is fixed in the deep foundation pit through the secondary grouting of the anchor bolt holes. The booster pump and the main pump use the same motor for driving. The booster pump moves at a constant speed, and the main pump moves at a variable speed through the hydraulic coupler. Above each of the main feed water pump groups, a monorail hoisting combination device is arranged for performing hoisting and maintenance replacement operations on the booster pump, the motor, the hydraulic coupler and the main pump respectively, each of the main feed water pump groups is arranged in alignment with the corresponding monorail hoisting combination device, and the monorail hoisting combination device comprises a monorail crane arranged horizontally and a monorail crane arranged longitudinally. The deaerator in the deaerating room of the turbine generator plant is fluidly coupled with the main feed water pump modular system, the outlet of the deaerator is connected to the inlet of each of the main feed water pump groups through a water inlet main pipe, and the outlet of each of the main feed water pump groups is sequentially connected to high-pressure heaters of different stages through a water outlet main pipe. Each of the main feed water pump groups is provided with a medium pressure feed water pipeline filter screen on the feed water pipeline, the medium pressure feed water pipeline filter screen is used for intercepting impurity particles in the main feed water, differential pressure monitoring devices are connected before and after the medium pressure feed water pipeline filter screen, and the differential pressure monitoring devices are used for monitoring the differential pressure between the two ends of the medium pressure feed water pipeline filter screen in real time to determine whether the medium pressure feed water pipeline filter screen is blocked and send an alarm signal to an upper system. The utility model relates to a main feed water pump module system, comprising:

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