Combined air extractor

Abstract

The invention discloses a combined air extractor. The combined air extractor comprises a box body, a main air extractor, a steam seal air extractor and a condensing heat exchanger, the main air extractor is arranged in the box body, and a main air extraction inlet of the main air extractor is used for being connected with a steam turbine condenser. The steam seal air extractor is arranged in the box body, and a steam seal air extraction inlet of the steam seal air extractor is used for being connected with a steam seal system of a steam turbine and a valve rod. The condensation heat exchanger is arranged in the box body, and an air inlet of the condensation heat exchanger is used for being connected with a main air extraction outlet of the main air extractor and a steam seal air extraction outlet of the steam seal air extractor. Therefore, according to the combined air extractor, the problems that a steam jet type / water jet type air extractor is low in efficiency, large in water ring type vibration, high in fault rate and incapable of recycling working media are solved, and the efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of energy and power station, in particular to a combined air extractor. Background Art

[0002] The steam vacuum pump is an important equipment in the steam power generation system of the power station. It is used to extract the air in the condensing heat exchanger, maintain the vacuum of the condensing heat exchanger, and extract the steam / gas leaking from the steam seal system and valve stem of the steam turbine, and recycle it after condensation. There are generally three types of vacuum pumps in the power station: steam jet type, water jet type, and water ring vacuum pump. The steam jet type / water jet type requires the use of high-speed flow of steam / water to generate the induced vacuum, which requires the consumption of new steam or high-pressure water, and is equipped with corresponding pipeline valves, etc., and the operating efficiency is very low, affecting the overall efficiency of the system. The water ring vacuum pump uses the volume change when the eccentric pump rotates to pump air, which has large vibration and high failure rate, and the steam carried in the air cannot be recycled, resulting in the loss of working fluid. Summary of the invention

[0003] The object of the present invention is to provide a combined vacuum pump, which solves the problems of low efficiency of steam jet / water jet vacuum pumps, large vibration of water ring type, high failure rate and inability to recover working fluid, and greatly improves the efficiency.

[0004] To achieve the above-mentioned purpose, the present invention provides a combined vacuum pump, comprising: a housing, a main vacuum pump, a steam-sealed vacuum pump and a condensing heat exchanger. The main vacuum pump is arranged in the housing, and the main vacuum pump inlet of the main vacuum pump is used to be connected to the turbine condenser. The steam-sealed vacuum pump is arranged in the housing, and the steam-sealed vacuum pump inlet of the steam-sealed vacuum pump is used to be connected to the steam-sealing system and valve stem of the steam turbine. And the condensing heat exchanger is arranged in the housing, and the air inlet of the condensing heat exchanger is used to be connected to the main vacuum pump outlet of the main vacuum pump and the steam-sealed vacuum pump outlet of the steam-sealed vacuum pump.

[0005] In one embodiment of the present invention, the main air extractor comprises: a main air extraction motor and a main air extraction pump. The main air extraction pump is connected to the main air extraction motor in a transmission manner, and the main air extraction outlet and the main air extraction inlet are both provided on the main air extraction pump.

[0006] In one embodiment of the present invention, the steam seal vacuum extractor comprises: a steam seal vacuum motor and a steam seal vacuum pump. The steam seal vacuum pump is drivingly connected to the steam seal vacuum motor, and the steam seal vacuum inlet and the steam seal vacuum outlet are both provided on the steam seal vacuum pump.

[0007] In one embodiment of the present invention, the condensing heat exchanger comprises: a body, a cooling water outlet water seal box, a cooling water inlet water seal box, a plurality of partitions and a plurality of condensing tube bundles. An air exhaust port is provided on the body. The cooling water outlet water seal box is arranged at one end of the body, and a cooling water outlet is provided on the cooling water outlet water seal box. The cooling water inlet water seal box is arranged at the other end of the body, and a cooling water inlet is provided on the cooling water inlet water seal box. The plurality of partitions are arranged in the body and are located between the cooling water outlet water seal box and the cooling water inlet water seal box. The plurality of condensing tube bundles are arranged in the body, and the two ends of the plurality of condensing tube bundles are respectively connected with the cooling water outlet water seal box and the cooling water inlet water seal box. The cooling water enters through the cooling water inlet of the cooling water inlet water seal box, flows through the cooling water inlet water seal box, the plurality of condensing tube bundles and the cooling water outlet water seal box in sequence, and flows out from the cooling water outlet of the cooling water outlet water seal box.

[0008] In one embodiment of the present invention, the condensing heat exchanger further comprises a condensate collection area, which is arranged in the body and located below the cooling water outlet water seal box, the cooling water inlet water seal box, the plurality of baffles and the plurality of condensation tube bundles, and the condensate collection area is used to collect the water cooled in the body. A condensate outlet is provided below the condensate collection area, and the condensate outlet is connected to the turbine condenser through a pipeline.

[0009] In one embodiment of the present invention, both the main vacuum pump and the steam seal vacuum pump are high-speed centrifugal pumps.

[0010] In one embodiment of the present invention, the combined air extractor further comprises: a main air extraction inlet pipe and a main air extraction outlet pipe. One end of the main air extraction inlet pipe is used to be connected to the main air extraction inlet, and the other end of the main air extraction inlet pipe is used to be connected to the turbine condenser. And one end of the main air extraction outlet pipe is used to be connected to the main air extraction outlet, and the other end of the main air extraction outlet pipe is used to be connected to the condensing heat exchanger.

[0011] In one embodiment of the present invention, the combined vacuum pump further comprises: a steam seal vacuum inlet pipe and a steam seal vacuum outlet pipe. One end of the steam seal vacuum inlet pipe is connected to the steam seal vacuum inlet, and the other end of the steam seal vacuum inlet pipe is used to connect to the steam turbine vacuum system and valve stem. One end of the steam seal vacuum outlet pipe is used to connect to the steam seal vacuum outlet, and the other end of the steam seal vacuum outlet pipe is used to connect to the condensing heat exchanger.

[0012] In one embodiment of the present invention, the combined vacuum pump further comprises: a control mechanism and a power supply mechanism. The control mechanism is electrically connected to the main vacuum motor and the steam seal vacuum motor respectively. And the power supply mechanism is electrically connected to the control mechanism, the main vacuum motor and the steam seal vacuum motor respectively.

[0013] In one embodiment of the present invention, the combined vacuum extractor further includes a water cooling mechanism, which is respectively connected to the cooling water inlet and the cooling water outlet, and the water cooling mechanism is used to provide the cooling water to the condensing heat exchanger.

[0014] Compared with the prior art, the combined vacuum pump according to the present invention utilizes a high-speed centrifugal pump to achieve vacuum extraction and utilizes a condensing heat exchanger to realize the condensation separation and recycling of steam in the air, thereby solving the problems of low efficiency of steam-jet / water-jet vacuum pumps, large vibration of water rings, high failure rates, and inability to recover working fluids. The efficiency is greatly improved, and the pump has a small size, light weight, and adopts an integrated module to simplify the external interface, making it easy to integrate, debug, and install. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the structure of a combined vacuum pump according to an embodiment of the present invention.

[0016] Description of main reference numerals:

[0017] 1-box body, 2-main exhaust motor, 3-main exhaust pump, 4-main exhaust inlet pipe, 5-steam seal exhaust motor, 6-steam seal exhaust pump, 7-steam seal exhaust inlet pipe, 8-steam seal exhaust outlet pipe, 9-main exhaust outlet pipe, 10-cooling water outlet water seal box, 11-cooling water outlet pipe, 12-condensation tube bundle, 13-partition, 14-condensate collection area, 15-condensate outlet pipe, 16-cooling water inlet pipe, 17-cooling water inlet water seal box, 18-air exhaust port. DETAILED DESCRIPTION

[0018] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0019] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0020] To facilitate understanding, the main implementation concepts of the embodiments of the present invention are first briefly described.

[0021] As the core equipment in the steam power generation system of power plants, steam vacuum pumps play a key role in maintaining the vacuum state of condensing heat exchangers and recovering steam from steam turbine seal systems and valve stem leakage. Traditionally, there are three main types of vacuum pumps used in power plants: steam jet type, water jet type, and water ring vacuum pump. However, each of these traditional vacuum pumps has significant defects.

[0022] The working principle of both steam jet and water jet vacuum pumps relies on the high-speed flow of steam or water to generate the induced vacuum. The steam jet vacuum pump consumes new steam, while the water jet requires high-pressure water, which not only increases the operating cost, but also requires the corresponding auxiliary facilities such as pipelines and valves, resulting in increased system complexity. More importantly, the operating efficiency of these two vacuum pumps is generally low, which has an adverse effect on the overall efficiency of the power station. In addition, the steam jet vacuum pump will also cause additional steam consumption during use, further reducing the energy utilization efficiency.

[0023] In contrast, although the water ring vacuum pump does not rely on steam or high-pressure water, its working principle is to use the volume change when the eccentric pump rotates to pump air. This type of pump will produce large vibrations during operation, resulting in a high failure rate and increased maintenance costs. What is more serious is that when the water ring vacuum pump handles air containing steam, it cannot effectively recover the steam, but directly discharges it into the atmosphere, resulting in the loss of working fluid. This not only wastes resources, but may also have a certain impact on the environment.

[0024] In summary, traditional vacuum pumps have problems to varying degrees in terms of efficiency, cost, maintenance, and environmental impact. Therefore, developing a new vacuum pump to address the deficiencies of existing technologies, improve vacuum efficiency, reduce operating costs, and reduce environmental impact has become a technical problem that needs to be solved in the field of steam power generation systems in power plants.

[0025] The inventors discovered the defects of the prior art as mentioned above, and the present invention provides a combined vacuum pump, which aims to overcome the defects of low efficiency of steam jet / water jet vacuum pumps, large vibration of water ring type, high failure rate and inability to recover the working fluid, and significantly improve the system efficiency. The combined vacuum pump integrates the main vacuum pump, steam seal vacuum pump and condensing heat exchanger into a box through integrated design, forming a compact and efficient modular structure. Both the main vacuum pump and the steam seal vacuum pump use high-speed centrifugal pumps to achieve efficient and low-vibration vacuuming effects. At the same time, the design of the condensing heat exchanger enables the steam in the air to be effectively condensed and recycled, avoiding the loss of working fluid. This innovative design not only greatly improves the vacuuming efficiency, but also simplifies the system structure, reduces external interfaces, facilitates integrated debugging and installation, and provides strong technical support for the optimization of power plant steam power generation systems.

[0026] Figure 1Schematic diagram of the structure of a combined vacuum pump according to an embodiment of the present invention. Figure 1 As shown, a combined vacuum pump according to a preferred embodiment of the present invention includes: a housing 1, a main vacuum pump, a steam-sealed vacuum pump and a condensing heat exchanger. The main vacuum pump is arranged in the housing 1, and the main vacuum pump inlet of the main vacuum pump is used to be connected to the turbine condenser. The steam-sealed vacuum pump is arranged in the housing 1, and the steam-sealed vacuum pump inlet of the steam-sealed vacuum pump is used to be connected to the steam seal system and valve stem of the steam turbine. And the condensing heat exchanger is arranged in the housing 1, and the air inlet of the condensing heat exchanger is used to be connected to the main vacuum pump outlet of the main vacuum pump and the steam-sealed vacuum pump outlet of the steam-sealed vacuum pump.

[0027] Specifically, the main vacuum pump and the steam seal vacuum pump are both cleverly arranged in the housing 1, and they respectively achieve efficient and low-vibration vacuum pumping effects through their respective high-speed centrifugal pumps. The inlet of the main vacuum pump is connected to the turbine condenser, and is used to extract air (with steam entrained therein) in the turbine condenser. The inlet of the steam seal vacuum pump is specifically used to connect to the steam seal system and valve stem of the steam turbine to extract steam or air leakage in these parts. The condensing heat exchanger is also integrated in the housing 1, and its air inlet is connected to the outlet of the main vacuum pump and the steam seal vacuum pump. The design of the condensing heat exchanger enables the incoming air and steam mixture to be effectively cooled, and the steam is condensed into water and recycled, thereby avoiding the loss of working fluid. This innovative design not only improves the vacuum pumping efficiency, but also realizes the recycling of resources.

[0028] Based on the above analysis, it can be seen that the combined vacuum pump of the present invention successfully solves various problems existing in the existing vacuum pumps through the application of integrated design, high-efficiency centrifugal pump and condensing heat exchanger. It not only greatly improves the vacuum efficiency, but also realizes the effective utilization of resources and environmental protection. At the same time, its small size, light weight and simplified external interface also make it have a wide range of application prospects in power station steam power generation systems.

[0029] In this embodiment, the main air extractor comprises: a main air extraction motor 2 and a main air extraction pump 3. The main air extraction pump 3 is connected to the main air extraction motor 2 in a transmission manner, and the main air extraction outlet and the main air extraction inlet are both provided on the main air extraction pump 3.

[0030] Specifically, the main vacuum pump is one of the key components of the combined vacuum pump, which is composed of a main vacuum motor 2 and a main vacuum pump 3. The main vacuum pump 3 is connected to the main vacuum motor 2 through a transmission to achieve power transmission and drive the pump body to operate. The main vacuum pump 3 is provided with a main vacuum outlet and a main vacuum inlet, and these two interfaces are responsible for discharging and inhaling gas, respectively. Among them, the main vacuum inlet is connected to the turbine condenser and is used to extract air (including steam) in the turbine condenser. Through the operation of the main vacuum pump 3, the air in the turbine condenser can be effectively extracted to maintain its vacuum state. At the same time, the extracted air (with steam entrained) is discharged through the main vacuum outlet and enters the subsequent processing flow, such as steam condensation recovery in the condensing heat exchanger. This design not only improves the vacuum efficiency, but also helps to recover and utilize steam and reduce working fluid loss.

[0031] In this embodiment, the steam seal vacuum extractor comprises: a steam seal vacuum motor 5 and a steam seal vacuum pump 6. The steam seal vacuum pump 6 is drivingly connected to the steam seal vacuum motor 5, and the steam seal vacuum inlet and the steam seal vacuum outlet are both provided on the steam seal vacuum pump 6.

[0032] Specifically, the steam seal vacuum pump, as an important component of the combined vacuum pump, specifically includes a steam seal vacuum motor 5 and a steam seal vacuum pump 6. The steam seal vacuum pump 6 is connected to the steam seal vacuum motor 5 through a transmission connection to ensure that the motor can effectively drive the pump body to work. In the design of the steam seal vacuum pump, a steam seal vacuum inlet and a steam seal vacuum outlet are specially set. These two interfaces are directly opened on the steam seal vacuum pump 6, which is convenient for efficient connection with the steam turbine steam seal system and the valve stem, so as to achieve effective extraction of leaking steam / gas. Such a design not only optimizes the working process of the steam seal vacuum pump, but also improves its extraction efficiency, which helps to maintain the stable operation of the steam power generation system of the power station. Through the effective operation of the steam seal vacuum pump, the vacuum state of the condensing heat exchanger can be further guaranteed, and the energy efficiency of the entire system can be improved.

[0033] In this embodiment, the condensing heat exchanger includes: a body, a cooling water outlet water seal box 10, a cooling water inlet water seal box 17, a plurality of partitions 13, and a plurality of condensing tube bundles 12. An air exhaust port 18 is provided on the body, and the air exhaust port 18 is connected to the external environment. The cooling water outlet water seal box 10 is arranged at one end of the body, and a cooling water outlet is provided on the cooling water outlet water seal box 10. The cooling water inlet water seal box 17 is arranged at the other end of the body, and a cooling water inlet is provided on the cooling water inlet water seal box 17. The plurality of partitions 13 are arranged in the body and are located between the cooling water outlet water seal box 10 and the cooling water inlet water seal box 17. And the plurality of condensing tube bundles 12 are arranged in the body, and the two ends of the plurality of condensing tube bundles 12 are respectively connected to the cooling water outlet water seal box 10 and the cooling water inlet water seal box 17. The cooling water enters through the cooling water inlet of the cooling water inlet water seal box 17 , flows through the cooling water inlet water seal box 17 , the multiple condenser tube bundles 12 and the cooling water outlet water seal box 10 in sequence, and flows out from the cooling water outlet of the cooling water outlet water seal box 10 .

[0034] Specifically, as an important component of the combined vacuum pump, the condensing heat exchanger is exquisitely designed and efficient. The condensing heat exchanger is mainly composed of a main body, a cooling water outlet water seal box 10, a cooling water inlet water seal box 17, a plurality of partitions 13 and a plurality of condensing tube bundles 12. The coordinated work of these components ensures that the condensing heat exchanger can efficiently condense the steam in the air and realize the recycling of the working fluid. The main body is the main structure of the condensing heat exchanger, which provides enough space to accommodate other components and ensures the smooth progress of the entire condensation process. The air exhaust port 18 is opened on the main body to discharge the remaining non-condensable air after condensation to the external environment. This design ensures the air pressure balance inside the condensing heat exchanger and the smooth separation of air and condensate. The cooling water outlet water seal box 10 and the cooling water inlet water seal box 17 are respectively arranged at both ends of the main body, and their main function is to control the inlet and outlet of cooling water. The cooling water inlet seal box 17 is provided with a cooling water inlet for introducing cooling water; and the cooling water outlet seal box 10 is provided with a cooling water outlet for discharging cooling water that has absorbed heat. The design of these two seal boxes not only ensures the smooth flow of cooling water, but also effectively prevents the leakage of cooling water, thereby ensuring the stable operation of the condensing heat exchanger. A plurality of partitions 13 are arranged in the body and are located between the cooling water outlet seal box 10 and the cooling water inlet seal box 17. The main function of these partitions 13 is to form a flow channel to guide the air and steam mixture to flow in an orderly manner inside the condensing heat exchanger. This design not only improves the condensation efficiency, but also ensures the coordinated work of various components inside the condensing heat exchanger. The plurality of condensing tube bundles 12 are the core components of the condensing heat exchanger. They are arranged in the body and are respectively connected to the cooling water outlet seal box 10 and the cooling water inlet seal box 17. The main function of the condensing tube bundle 12 is to provide sufficient heat exchange area so that the steam in the air can be fully condensed. The cooling water enters the condensing tube bundle 12 through the cooling water inlet, and exchanges heat with the air and steam mixture outside the tube, thereby realizing the condensation of steam. The condensed water droplets are collected in the condensate collection area 14, and discharged to the turbine condenser through the condensate outlet for recycling. The condensate collection area 14 is located at the bottom of the condensing heat exchanger body, and it is used to collect the condensed water. This design not only ensures the smooth discharge of the condensate, but also avoids the corrosion and damage of the condensate to other components inside the condensing heat exchanger. A condensate outlet is provided below the condensate collection area 14, which is used to discharge the condensate from the condensing heat exchanger (discharged to the turbine condenser) for subsequent treatment or recycling.

[0035] Based on the above analysis, it can be seen that the condensing heat exchanger in the present invention is exquisitely designed, efficient and practical. It realizes efficient condensation of steam in the air and recycling of working fluids through reasonable structural design and component layout. This innovative design not only improves the performance of the condensing heat exchanger, but also provides strong technical support for the optimization of the steam power generation system of the power station. At the same time, as an important part of the combined vacuum pump, the condensing heat exchanger works in coordination with other components to achieve efficient, low-vibration, and low-cost vacuum effects, making important contributions to energy conservation, emission reduction and sustainable development of the power station.

[0036] In this embodiment, the condensing heat exchanger further includes a condensate collection area 14, which is disposed in the body and is located below the cooling water outlet water seal box 10, the cooling water inlet water seal box 17, the multiple baffles 13 and the multiple condensation tube bundles 12, and the condensate collection area 14 is used to collect the water cooled in the body. A condensate outlet is provided below the condensate collection area 14, and the condensate outlet is connected to the turbine condenser through a pipeline.

[0037] Specifically, a condensate collection area 14 is added to the condensing heat exchanger. This area is cleverly arranged in the body and is located below the cooling water outlet water seal box 10, the cooling water inlet water seal box 17, multiple baffles 13 and multiple condensing tube bundles 12. Such a layout ensures that the water droplets generated during the condensation process can be smoothly collected, avoiding the retention or disorderly flow of water inside the condensing heat exchanger. The main function of the condensate collection area 14 is to collect the water after cooling in the body, which is condensed by the steam in the condensing tube bundle 12. In order to facilitate the discharge and recycling of the condensate, a condensate outlet is specially opened below the condensate collection area 14. Such a design not only improves the working efficiency of the condensing heat exchanger, but also ensures the timely discharge of the condensate, avoiding performance degradation or potential safety hazards caused by water accumulation. In short, this improvement makes the role of the condensing heat exchanger in the combined vacuum pump more prominent, providing a strong guarantee for the stable and efficient operation of the entire system.

[0038] In this embodiment, the main vacuum pump 3 and the steam seal vacuum pump 6 are both high-speed centrifugal pumps.

[0039] Specifically, the main vacuum pump 3 and the steam seal vacuum pump 6 are both high-speed centrifugal pumps, a design choice aimed at improving the vacuum efficiency and reducing vibration. The high-speed centrifugal pump, with its high efficiency and low maintenance, can ensure that the main vacuum pump and the steam seal vacuum pump maintain high performance during operation, thereby effectively extracting the air in the turbine condenser and the leakage of the turbine steam seal system and valve stem, while reducing energy consumption and system failure rate, and further improving the stability and efficiency of the entire power plant steam power generation system.

[0040] In this embodiment, the combined air extractor further includes: a main air extraction inlet pipe 4 and a main air extraction outlet pipe 9. One end of the main air extraction inlet pipe 4 is used to be connected to the main air extraction inlet, and the other end of the main air extraction inlet pipe 4 is used to be connected to the turbine condenser. One end of the main air extraction outlet pipe 9 is used to be connected to the main air extraction outlet, and the other end of the main air extraction outlet pipe 9 is used to be connected to the condensing heat exchanger.

[0041] Specifically, the combined vacuum pump not only integrates key components such as the main vacuum pump, the steam seal vacuum pump and the condensing heat exchanger, but also cleverly designs the main vacuum inlet pipe 4 and the main vacuum outlet pipe 9 to ensure the smooth operation and high efficiency of the entire system. One end of the main vacuum inlet pipe 4 is carefully designed to be connected to the main vacuum inlet. This connection point is located on the main vacuum pump 3 and is the starting point for extracting air (including steam) from the turbine condenser. The other end of the pipe is cleverly connected to the turbine condenser so that the non-condensable gas in the turbine condenser can be effectively extracted, thereby maintaining the vacuum state of the turbine condenser, which is the key to improving the efficiency of steam power generation. At the same time, the design of the main vacuum outlet pipe 9 is also crucial. One end of it is closely connected to the main vacuum outlet, which is the outlet for the air mixture containing steam to be discharged after the main vacuum pump 3 completes the vacuum task. The other end of the pipe leads directly to the condensing heat exchanger. This design ensures that the extracted steam-gas mixture can quickly and efficiently enter the condensation area for subsequent condensation processing. Through such a pipeline design, the present invention not only realizes the seamless connection between the main vacuum pump and the condensing heat exchanger, but also greatly optimizes the entire process of vacuum pumping and condensation. The reasonable layout of the main vacuum inlet pipeline 4 and the main vacuum outlet pipeline 9 not only reduces unnecessary pipeline bending and resistance, but also improves the flow efficiency of the gas, thereby further improving the overall performance of the combined vacuum pump. In addition, this design also fully considers the convenience of actual installation and debugging. The integrated modular design, coupled with the simple and clear pipeline connection, makes it easier to integrate and deploy the combined vacuum pump in the steam power generation system of the power station. This not only reduces the installation cost, but also reduces the difficulty and workload of later maintenance.

[0042] Based on the above analysis, it can be seen that the design of the main exhaust inlet pipe 4 and the main exhaust outlet pipe 9 in the present invention is the key to the combined exhauster to achieve efficient exhaust and condensation. They not only ensure the smooth flow of gas inside the system, but also further improve the performance and efficiency of the entire combined exhauster by optimizing the pipeline layout and connection method. This innovative design undoubtedly provides strong technical support for the optimization and upgrading of the steam power generation system of the power station.

[0043] In this embodiment, the combined vacuum pump further includes: a steam seal vacuum inlet pipe 7 and a steam seal vacuum outlet pipe 8. One end of the steam seal vacuum inlet pipe 7 is connected to the steam seal vacuum inlet, and the other end of the steam seal vacuum inlet pipe 7 is used to connect to the steam turbine vacuum system and the valve stem. One end of the steam seal vacuum outlet pipe 8 is used to connect to the steam seal vacuum outlet, and the other end of the steam seal vacuum outlet pipe 8 is used to connect to the condensing heat exchanger.

[0044] Specifically, the steam seal vacuum pump is composed of a steam seal vacuum motor 5 and a steam seal vacuum pump 6, which work together through a transmission connection. The steam seal vacuum pump 6 is provided with a steam seal vacuum inlet and a steam seal vacuum outlet, which are key interfaces for realizing its function. In order to effectively integrate the steam seal vacuum pump into the entire system, the present invention also designs a steam seal vacuum inlet pipe 7 and a steam seal vacuum outlet pipe 8. These two sections of the pipe respectively connect the inlet and outlet of the steam seal vacuum pump 6 with the steam seal system and valve stem of the steam turbine, and the condensing heat exchanger, ensuring the smooth flow and effective treatment of the steam-gas mixture. One end of the steam seal vacuum inlet pipe 7 is directly connected to the steam seal vacuum inlet, and the other end thereof extends to the steam seal system and valve stem of the steam turbine. This design enables the leaked steam and air mixture to be sucked in time, avoiding the accumulation of steam in the steam seal system, which helps to maintain the normal operation and sealing performance of the steam turbine. At the same time, one end of the steam seal exhaust outlet pipe 8 is connected to the steam seal exhaust outlet, and the other end is connected to the condensing heat exchanger. Such a layout ensures that the sucked steam-gas mixture can directly enter the condensing heat exchanger for condensation treatment, thereby achieving effective steam recovery and air discharge. Through the reasonable configuration of the steam seal exhaust inlet pipe 7 and the outlet pipe, the present invention not only improves the working efficiency of the steam seal exhauster, but also optimizes the system integration of the entire combined exhauster, reduces unnecessary pipeline connections and interfaces, and reduces the complexity and maintenance cost of the system. In addition, this design also makes the combined exhauster more stable and reliable during operation, reducing the performance degradation caused by improper pipeline connection or leakage.

[0045] Based on the above analysis, it can be seen that the present invention introduces a steam seal vacuum pump into the combined vacuum pump, and through the carefully designed steam seal vacuum inlet pipe 7 and outlet pipe, it realizes the efficient treatment of the steam seal system and valve stem leakage steam of the steam turbine, which not only improves the overall efficiency of the system, but also enhances the stability and reliability of the system, and provides strong technical support for the optimization and upgrading of the steam power generation system of the power station.

[0046] In this embodiment, the combined vacuum pump further includes: a control mechanism and a power supply mechanism. The control mechanism is electrically connected to the main vacuum motor 2 and the steam seal vacuum motor 5 respectively. And the power supply mechanism is electrically connected to the control mechanism, the main vacuum motor 2 and the steam seal vacuum motor 5 respectively.

[0047] Specifically, the design of the combined vacuum pump not only focuses on the efficient integration of the vacuum pumping and condensation functions, but also focuses on the automatic control and energy supply of the system. The combined vacuum pump has two key components, the control mechanism and the power supply mechanism, to achieve precise control and stable power support for the entire vacuum pumping process. As the "brain" of the system, the control mechanism undertakes the important task of command and coordination. It is connected to the main vacuum pumping motor 2 and the steam seal vacuum pumping motor 5 respectively through electrical connection, and can flexibly adjust the operating status of the two motors, such as starting, stopping, speed adjustment, etc., according to the preset program or real-time feedback signal, so as to ensure the efficiency and stability of the vacuum pumping process. This intelligent control method not only improves the vacuum pumping efficiency, but also effectively avoids equipment damage or inefficiency caused by improper human operation. At the same time, the power supply mechanism is the "heart" of the entire combined vacuum pump, providing a steady supply of power support for the control mechanism, the main vacuum pumping motor 2 and the steam seal vacuum pumping motor 5. It ensures the stability and safety of power supply through carefully designed circuit layout and protection measures, and avoids damage to the equipment due to power fluctuations or interruptions. The addition of the power supply mechanism enables the combined vacuum pump to operate continuously and stably in various complex environments, providing a strong guarantee for the reliable operation of the power station steam power generation system. Figure 1 Shown in.

[0048] Based on the above analysis, the introduction of control mechanism and power supply mechanism not only improves the automation level and operation stability of the combined vacuum pump, but also provides solid support for its efficient and safe operation. This innovative design not only solves the shortcomings of traditional vacuum pumps in control and power supply, but also provides new ideas and directions for the optimization and upgrading of power plant steam power generation systems.

[0049] In this embodiment, the combined vacuum pump may also include a temperature sensor, a pressure sensor, a flow sensor and a vibration sensor electrically connected to the control mechanism. The temperature sensor is installed at the inlet and outlet of the main vacuum pump, the steam seal vacuum pump and the condensing heat exchanger to monitor the temperature of the gas and the cooling water. The pressure sensor is installed at the inlet and outlet of the condensing heat exchanger to monitor the pressure of the gas and the cooling water. The flow sensor is installed at the inlet and outlet of the main vacuum pump, the steam seal vacuum pump and the cooling water pipeline to monitor the flow of the gas and the cooling water. The vibration sensor is installed on the main vacuum pump 3 and the steam seal vacuum pump 6 to monitor the vibration of the pump to determine its operating status. Among them, after the control mechanism receives the data of the above-mentioned multiple sensors, it can perform data cleaning, data fusion and feature extraction on these data.

[0050] First, data cleaning is to remove noise and outliers. For example, for temperature sensor data, a reasonable temperature range can be set, and data outside this range will be regarded as outliers and eliminated; for example, for pressure sensor data, a reasonable pressure range can be set, and data outside this range may indicate that there is an abnormality in the system, such as pipe blockage, valve failure, etc., so these data should be regarded as outliers and eliminated; for example, flow sensor data may be affected by factors such as bubbles and impurities in the pipeline and cause fluctuations, so a filtering algorithm (such as moving average filtering, Kalman filtering, etc.) is used to smooth the flow data to remove noise and outliers; for example, vibration sensor data may be affected by multiple factors such as environmental noise and mechanical vibration, so threshold judgment, spectrum analysis and other methods are used to identify and eliminate abnormal vibration data.

[0051] Then, the data from different sensors are fused to form a more comprehensive data set. For example, the temperature, pressure and flow data can be fused to comprehensively analyze the working status of the condensing heat exchanger (the temperature, pressure and flow data at the same time point can be fused to form a data point containing multiple parameters, so that the status of the condensing heat exchanger at that time point can be more comprehensively reflected); for example, when the temperature sensor shows that the gas temperature at the inlet of the condensing heat exchanger is too high, and the pressure sensor shows that the pressure is also high, and the flow sensor shows that the flow is normal or slightly decreased, the control system can combine this information and infer that there may be overheating inside the condensing heat exchanger, which may be caused by insufficient cooling water flow or poor cooling effect.

[0052] Finally, useful feature information is extracted from the fused data. For example, the average value, standard deviation, and change trend of temperature, pressure, and flow can be calculated as inputs to the intelligent control algorithm. For example, suppose that at a certain point in time, the fused data shows that the temperature and pressure of the condensing heat exchanger are high, while the flow is normal. Through feature extraction, feature information such as the average value, standard deviation, and change trend of these parameters can be obtained. Then, the intelligent control algorithm can determine whether the working state of the condensing heat exchanger is abnormal based on this feature information, and generate corresponding control instructions, such as adjusting the flow or temperature of the cooling water to reduce the temperature and pressure of the condensing heat exchanger to ensure the stable operation of the system. Through such a data fusion and feature extraction process, the control mechanism can more accurately understand the operating state of the combined vacuum pump and generate more accurate control instructions, thereby improving the efficiency and stability of the entire system.

[0053] Next, the control mechanism uses the fuzzy control algorithm to intelligently control the combined vacuum pump. First, the extracted characteristic information (such as the average value and change trend of temperature, pressure, and flow) is fuzzified and converted into fuzzy language variables (such as "low", "medium", "high", etc.); then, according to the preset fuzzy control rule base, the fuzzy language variables are inferred to obtain the fuzzy value of the control instruction. For example, if the temperature of the condensing heat exchanger is high and the pressure is also high, the fuzzy control algorithm will output a control instruction to reduce the pump speed. Finally, the fuzzy value of the control instruction is converted into a specific control parameter value (such as pump speed, valve opening, etc.) so as to directly act on each component of the combined vacuum pump. Taking the condensing heat exchanger in the combined vacuum pump as an example, the application process of the fuzzy control algorithm is further explained. For example, at a certain time point, the control mechanism obtains the relevant data of the condensing heat exchanger through the temperature sensor, pressure sensor and flow sensor. After data cleaning and fusion, these data extract the characteristic information such as the average value of temperature, pressure and flow and their change trend. For example, the average value of temperature is 80℃, the average value of pressure is 1.2MPa, the average value of flow rate is 50L / min, and the temperature shows an upward trend, while the pressure and flow rate remain basically stable. Next, the control mechanism uses the fuzzy control algorithm to process these characteristic information. First, the average values ​​of temperature, pressure and flow rate are fuzzified and converted into fuzzy language variables. For example, according to the preset fuzzy set, the temperature of 80℃ may be classified as "high", the pressure of 1.2MPa is classified as "medium", and the flow rate of 50L / min is also classified as "medium". Similarly, the temperature change trend "increasing" is also converted into fuzzy language variables. Then, the control mechanism infers these fuzzy language variables according to the preset fuzzy control rule base. The fuzzy control rule base is, for example, a series of "if-then" statements that define the control instructions that should be output under different input variable combinations. For example, a rule is such as: "If the temperature level is 'high' and the pressure level is 'medium' and the flow level is 'medium', then output a control instruction to reduce the pump speed." In this example, since the temperature level is "high", the control mechanism will infer from the rule base that the pump speed needs to be reduced to reduce the temperature of the condensing heat exchanger. Therefore, the fuzzy control algorithm will output a control instruction to reduce the pump speed, which is expressed in the form of a fuzzy value, such as "reduce the speed level to 'medium'". Finally, the control mechanism converts this fuzzy value into a specific control parameter value so that it can directly act on the various components of the combined vacuum pump. In this example, the fuzzy value "reduce the speed level to 'medium'" is converted into a specific pump speed value, such as reducing the speed of the main vacuum pump 33 from the current 1500rpm to 1200rpm. Through such a process, the fuzzy control algorithm can dynamically adjust the speed of the main vacuum pump 33 according to the real-time status of the condensing heat exchanger, thereby ensuring that the condensing heat exchanger operates in an efficient and stable state.This intelligent control method not only improves the response speed and stability of the system, but also reduces the need for human intervention and reduces operation and maintenance costs.

[0054] The output of the intelligent control algorithm will directly act on the control system of the combined vacuum pump to adjust the working status of the main vacuum pump, steam seal vacuum pump and condensing heat exchanger. For example, if the algorithm outputs a control instruction to reduce the pump speed, the control system will adjust the pump speed accordingly. The control strategy is dynamically adjusted based on the real-time feedback of the system and the output of the intelligent control algorithm. For example, if the temperature and pressure of the condensing heat exchanger are still high after reducing the pump speed, the algorithm may further adjust the control instructions, such as turning on backup equipment or increasing the cooling water flow.

[0055] In this embodiment, the combined vacuum extractor further includes a water cooling mechanism, which is respectively connected to the cooling water inlet and the cooling water outlet, and the water cooling mechanism is used to provide the cooling water to the condensing heat exchanger.

[0056] Specifically, the water cooling mechanism is not only closely connected with the cooling water inlet and cooling water outlet of the condensing heat exchanger, but also undertakes the important task of supplying cooling water to the condensing heat exchanger. This design cleverly realizes the cooling water circulation function. The water cooling mechanism delivers cooling water to the cooling water inlet water seal box 17 of the condensing heat exchanger through the cooling water inlet, and the cooling water then flows through the condensing tube bundle 12, where it exchanges heat with the steam-gas mixture from the main vacuum pump and the steam seal vacuum pump, so that the steam condenses into water. The condensed water drops into the condensate collection area 14 and is discharged to the turbine condenser through the condensate outlet. The connection between the turbine condenser and the condensate outlet means that the condensate can be effectively guided and recovered for system recycling or other purposes, thereby improving the utilization efficiency of resources. At the same time, after completing its cooling task, the cooling water is collected through the cooling water outlet water seal box 10, flows out from the cooling water outlet, and returns to the water cooling mechanism for re-cooling or recycling. This process not only ensures the efficient operation of the condensing heat exchanger, but also reduces the waste of water resources through the closed-loop management of the water cooling mechanism, improving the environmental performance and economic benefits of the entire system. In addition, the addition of the water cooling mechanism also helps to maintain the stability of the internal temperature of the condensing heat exchanger, improve the condensation efficiency, and further enhance the ability and stability of the combined vacuum pump when handling large amounts of steam and gas mixtures. Through close cooperation with the main vacuum pump, steam seal vacuum pump and condensing heat exchanger, the water cooling mechanism makes the entire combined vacuum pump system more efficient, compact and easy to maintain.

[0057] Based on the above analysis, it can be seen that the water cooling mechanism in this embodiment not only optimizes the cooling and condensation process of the combined vacuum pump, but also improves the overall efficiency and environmental protection level of the system through the recycling and reuse of the condensate. It is an important part of the technical innovation and performance improvement of the combined vacuum pump.

[0058] In practical applications, the combined vacuum pump of the present invention mainly includes three parts: a main vacuum pump, a steam-sealed vacuum pump and a condensing heat exchanger, which are integrated and packaged in a structural box 1 as a whole to form a combined vacuum pump module. Among them, the main vacuum pump includes: a main vacuum motor 2, a main vacuum pump 3, a main vacuum inlet pipe 4 and a main vacuum outlet pipe 9. Among them, the steam-sealed vacuum pump includes: a steam-sealed vacuum motor 5, a steam-sealed vacuum pump 6, a steam-sealed vacuum inlet pipe 7 and a steam-sealed vacuum outlet pipe 8. Among them, the condensing heat exchanger includes a cooling water outlet water seal box 10, a cooling water outlet pipe 11, a condensing tube bundle 12, a partition 13, a condensate collection area 14, a condensate outlet pipe 15, a cooling water inlet pipe 16, a cooling water inlet water seal box 17 and an air exhaust port 18.

[0059] The main air extraction pump 3 is driven by the main air extraction motor 2 to extract the air (with steam) in the turbine condenser from the main air extraction inlet pipe 4. The steam seal air extraction pump 6 is driven by the steam seal air extraction motor 5 to extract the steam / gas leakage from the steam seal system and valve stem from the steam seal air extraction inlet pipe 7.

[0060] After the sucked steam-gas mixture is discharged through the main exhaust outlet pipe 9 and the steam seal exhaust outlet pipe 8, it enters the condensing heat exchanger area, flows along the flow channel formed by the partition 13, and is cooled by the condensing tube bundle 12. The steam in it condenses into water, drips and collects in the condensate collection area 14, and is discharged into the turbine condenser through the condensate outlet pipe 15 for recycling. The non-condensed air is finally discharged to the external environment through the air exhaust port 18.

[0061] The condensing heat exchanger is water-cooled. The cooling water enters the cooling water inlet water seal box 17 through the cooling water inlet pipe 16 for diversion, enters the condensing tube bundle 12 to cool the steam-gas mixture, and then is collected through the cooling water outlet water seal box 10 and flows out from the cooling water outlet pipe 11.

[0062] In summary, the combined vacuum pump of the present invention utilizes a high-speed centrifugal pump to achieve vacuum extraction and utilizes a condensing heat exchanger to realize the condensation separation and recycling of steam in the air, thereby solving the problems of low efficiency of steam-jet / water-jet vacuum pumps, large vibration of water rings, high failure rate, and inability to recover working fluids. It greatly improves efficiency, has a small size and light weight, and adopts an integrated module to simplify external interfaces, making it easy to integrate, debug, and install.

[0063] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A combined vacuum extractor, characterized in that: include: Box; A main vacuum pump is arranged in the box, and a main vacuum inlet of the main vacuum pump is used to be connected to a steam turbine condenser; A steam seal vacuum extractor is disposed in the housing, and a steam seal vacuum inlet of the steam seal vacuum extractor is used to be connected to a steam seal system and a valve stem of a steam turbine; and A condensing heat exchanger is arranged in the box body, and the air inlet of the condensing heat exchanger is used to be connected with the main air extraction outlet of the main air extractor and the steam seal air extraction outlet of the steam seal air extractor.

2. The combined vacuum extractor according to claim 1, characterized in that: The main air extractor comprises: Main exhaust motor; and The main air pump is connected to the main air motor in a transmission manner, and the main air outlet and the main air inlet are both arranged on the main air pump.

3. The combined vacuum extractor according to claim 2, characterized in that: The steam seal vacuum extractor comprises: Steam seal exhaust motor; and The steam seal exhaust pump is drivingly connected to the steam seal exhaust motor, and the steam seal exhaust inlet and the steam seal exhaust outlet are both arranged on the steam seal exhaust pump.

4. The combined vacuum extractor according to claim 1, characterized in that: The condensing heat exchanger comprises: A main body, wherein the main body is provided with an air exhaust port; A cooling water outlet water seal box is arranged on one end of the body, and a cooling water outlet is provided on the cooling water outlet water seal box; A cooling water inlet water seal box is arranged on the other end of the body, and a cooling water inlet is opened on the cooling water inlet water seal box; a plurality of baffles, disposed in the body and located between the cooling water outlet water seal box and the cooling water inlet water seal box; and A plurality of condensing tube bundles are arranged in the body, and two ends of the plurality of condensing tube bundles are respectively connected with the cooling water outlet water seal box and the cooling water inlet water seal box; The cooling water enters through the cooling water inlet of the cooling water inlet water seal box, flows through the cooling water inlet water seal box, the multiple condensation tube bundles and the cooling water outlet water seal box in sequence, and flows out from the cooling water outlet of the cooling water outlet water seal box.

5. The combined vacuum extractor according to claim 4, characterized in that: The condensing heat exchanger also includes: A condensate collection area is provided in the body and is located below the cooling water outlet water seal box, the cooling water inlet water seal box, the plurality of baffles and the plurality of condensation tube bundles, and the condensate collection area is used to collect the cooled water in the body; A condensate outlet is provided below the condensate collection area, and the condensate outlet is connected to the steam turbine condenser through a pipeline.

6. The combined vacuum extractor according to claim 3, characterized in that: The main air extraction pump and the steam seal air extraction pump both adopt high-speed centrifugal pumps.

7. The combined vacuum extractor according to claim 1, characterized in that: Also includes: A main air extraction inlet pipeline, one end of which is used to be connected to the main air extraction inlet, and the other end of which is used to be connected to the steam turbine condenser; as well as A main air extraction outlet pipeline, one end of which is used to be connected to the main air extraction outlet, and the other end of which is used to be connected to the condensing heat exchanger.

8. The combined vacuum extractor according to claim 1, characterized in that: Also includes: a steam seal exhaust inlet pipe, one end of which is connected to the steam seal exhaust inlet, and the other end of which is used to be connected to the steam seal system and the valve stem of the steam turbine; and A steam seal exhaust outlet pipe, one end of which is used to be connected to the steam seal exhaust outlet, and the other end of which is used to be connected to the condensing heat exchanger.

9. The combined vacuum extractor according to claim 3, characterized in that: Also includes: A control mechanism, electrically connected to the main air extraction motor and the steam seal air extraction motor respectively; as well as The power supply mechanism is electrically connected to the control mechanism, the main air extraction motor and the steam seal air extraction motor respectively.

10. The combined vacuum extractor according to claim 5, characterized in that: Also includes: A water cooling mechanism is connected to the cooling water inlet and the cooling water outlet respectively, and the water cooling mechanism is used to provide the cooling water to the condensing heat exchanger.

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