Feed pump sealing system and control method

Abstract

The invention discloses a feed pump sealing system and a control method, which comprises the following steps: monitoring system operation parameters including unit load signals, condensate pump outlet condensate water mother pipe pressure and sealing control valve opening; increasing the pressure of the mother pipe in a variable-frequency manner, judging whether preset conditions are met or not based on system operation parameters, starting a variable-frequency booster pump when the preset conditions are met, and setting the initial output pressure of the variable-frequency booster pump; the water pump is kept sealed, the variable-frequency booster pump is adjusted to control sealing water to be within a certain pressure range, and the stable sealing effect is maintained; keeping the pressure of the mother pipe, and further judging whether auxiliary equipment needs to be started according to the opening degree of the sealing control valve or the outlet pressure of the booster pump; and when the opening degree of the sealing control valve reaches a set range or the variable-frequency booster pump trips, the pressure reducing valve is opened to be switched to the emergency pipeline, the variable-frequency booster pump stably supplies water when the three water sources are switched and adjusted, the pressure fluctuation of the sealing water is reduced and the load is low, energy conservation and consumption reduction are achieved, and stable supply of the sealing water under the load of 20% is met.

Description

Technical Field

[0001] This invention relates to the field of water pump sealing, and in particular to a water pump sealing system and control method. Background Technology

[0002] The sealing water in the feedwater pump serves to prevent high-pressure water leakage from the pump and to cool the bearings. This sealing water is typically drawn from the condensate header at the condensate pump outlet. However, the pressure in the condensate header fluctuates with the unit load. When the unit load fluctuates significantly, the pressure fluctuation is substantial, often causing the sealing water valve to automatically shut off. Insufficient sealing water pressure at low unit loads and interruption of the feedwater sealing water supply can lead to feedwater pump tripping, vacuum drop, and equipment damage. Current sealing water control systems cannot meet the requirements for large load fluctuations and deep peak shaving and energy saving. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to maintain the supply of sealing water even when a single pipeline fails, so as to avoid unplanned downtime.

[0004] The above-mentioned technical problems are solved by the following technical solution: The present invention proposes a control method for the sealing of a water pump, which includes monitoring of system operating parameters, including unit load signal, condensate outlet condensate header pressure and sealing valve opening.

[0005] The variable frequency increases the pressure in the main pipe. Based on the system operating parameters, it is determined whether the preset conditions are met. When the preset conditions are met, the variable frequency booster pump is started and its initial output pressure is set.

[0006] To maintain a stable seal, adjust the variable frequency booster pump to control the sealing water within a certain pressure range.

[0007] Maintain the main pipe pressure, and further determine whether auxiliary equipment needs to be started based on the opening of the sealing valve or the outlet pressure of the booster pump.

[0008] Emergency pipeline activation analysis: When the sealing valve opening reaches the set range or the variable frequency booster pump trips, the pressure reducing valve is opened to switch to the emergency pipeline.

[0009] Preferably, the present invention provides a water supply pump sealing system, comprising: the initial output pressure of the variable frequency booster pump is set to be 0.2 MPa above the condensate header at the pump outlet at the start time, wherein the initial output pressure is 1.4-1.8 MPa.

[0010] In a preferred embodiment of the water supply pump sealing system and control method of the present invention: the condensate outlet condensate header is used to directly supply pump sealing water;

[0011] The backup pipeline can boost the supply of sealing water to the pump;

[0012] The condensate header at the condensate pump outlet supplies sealing water to the backup pipeline via a pipeline.

[0013] In a preferred embodiment of the water supply pump sealing system and control method of the present invention: the backup pipeline includes: the variable frequency booster pump, which is used to pressurize the water in the condensate header at the outlet of the condensate pump and supply it to the pump sealing water; the variable frequency booster pump is connected to the condensate header at the outlet of the condensate pump through a pipeline.

[0014] In a preferred embodiment of the water supply pump sealing system and control method of the present invention: the emergency pipeline further includes: a pressure measuring point, installed on the condensate header at the outlet of the condensate pump and at the outlet position of the variable frequency booster pump, for real-time detection and feedback of the header pressure and the pump outlet pressure.

[0015] In a preferred embodiment of the water pump sealing system and control method of the present invention, it further includes:

[0016] The water sealing component of the water pump is used to prevent high-pressure water from leaking out of the pump and to cool the bearings.

[0017] In a preferred embodiment of the water supply pump sealing system and control method of the present invention: one end of the condensate outlet condensate header pipe of the condensate pump is connected to a fine treatment system via a pipeline, and one end of the fine treatment system is connected to the condensate pump via a pipeline.

[0018] The fine treatment system is used for water purification to ensure the quality of the sealed water;

[0019] The condensate pump is used to provide sealing water to the condensate header at the pump outlet.

[0020] In a preferred embodiment of the water supply pump sealing system and control method of the present invention: an emergency pipeline is used to supply pump sealing water in an emergency when the variable frequency booster pump trips or the sealing valve is greater than 90%.

[0021] In a preferred embodiment of the water pump sealing system and control method of the present invention: the emergency pipeline includes:

[0022] Water storage tanks are used to store emergency sealing water;

[0023] A condensate transfer pump is used to transfer the sealing water in the water storage tank;

[0024] A pressure reducing valve is used to automatically adjust the valve opening as needed to maintain the outlet pressure and flow rate. The condensate delivery pump is connected to the water storage tank through a pipeline, and the pressure reducing valve is installed on the output pipeline of the condensate delivery pump.

[0025] In a preferred embodiment of the water supply pump sealing system and control method of the present invention: the water supply pump sealing water component includes:

[0026] The sealed water outlet is connected to the condensate header of the condensate pump outlet, the variable frequency booster pump, and the condensate delivery pump via a pipeline.

[0027] A sealing damper is used to dynamically adjust the amount of sealing water entering the sealing part of the feed water pump according to the actual needs of the system.

[0028] The beneficial effects of this invention are as follows: This sealing system and control method, through three-way water source switching and dynamic adjustment, results in a smaller range of sealing water pressure fluctuations compared to traditional systems. Under low load conditions, the output of the condensate pump can be further reduced, and a variable frequency booster pump can be used to stably supply sealing water to the pump, achieving energy saving and consumption reduction. It can meet the stable supply of sealing water for deep adjustment at 20% load. The redundant design ensures that the system can maintain the sealing water supply even in the event of a single pipeline failure, avoiding unplanned downtime. This method has low modification costs, high reliability, and simple and convenient subsequent equipment maintenance. It is applicable to the modification of sealing water methods for all power plant feedwater pumps, possessing strong operability and versatility. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments of the present invention will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Wherein:

[0030] Figure 1 A schematic diagram of the overall water pump sealing system is shown.

[0031] Figure 2 A flowchart of the water pump seal control method is shown;

[0032] In the picture:

[0033] 1. Condensate header at condensate pump outlet; 11. Fine treatment system; 12. Condensate pump; 2. Backup pipeline; 21. Variable frequency booster pump; 22. Pressure measurement point; 3. Sealing water components for feed water pump; 31. Sealing water outlet; 32. Sealing valve; 4. Emergency pipeline; 41. Water storage tank; 42. Condensate transfer pump; 43. Pressure reducing valve. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0035] The terminology used in this invention is that which is currently widely used in the art in consideration of the function of the invention; however, these terms may vary according to the intent of those skilled in the art, precedent, or new technology in the art. Furthermore, specific terms may be chosen by the applicant, and in such cases, their detailed meanings will be described in the detailed description of the invention. Therefore, the terms used in this specification should not be construed as simple names, but rather based on their meanings and the overall description of the invention.

[0036] Reference Figure 1 This embodiment provides a control method for the sealing of a water supply pump, including step S1: real-time monitoring of system operating parameters, including unit load signal, condensate outlet condensate header pressure, and sealing valve opening; step S2: determining whether preset conditions are met based on system operating parameters; when preset conditions are met, starting the variable frequency booster pump and setting its initial output pressure; step S3: after a set time, adjusting the variable frequency booster pump to control the sealing water within a certain pressure range to maintain a stable sealing effect; step S4: further determining whether auxiliary equipment needs to be started based on the sealing valve opening or booster pump outlet pressure; step S5: when the sealing valve opening reaches the set range or the variable frequency booster pump trips, opening the pressure reducing valve to switch to the emergency pipeline.

[0037] The initial output pressure of the variable frequency booster pump is set to be 0.2 MPa above the condensate header at the pump outlet at startup, with an output pressure of 1.4-1.8 MPa.

[0038] It is worth noting that the feedwater pump seal control method described in this embodiment is applied to the feedwater pump seal water system of a 600MW supercritical unit. Based on the above-mentioned 600MW supercritical unit, the specific operation steps of the feedwater pump seal control method include the following:

[0039] Specifically, 1) check whether the unit load is less than 254MW; check whether the condensate outlet condensate header pressure is less than 1MPa. If either of these conditions is met, then 2) is executed.

[0040] 2) Start the variable frequency booster pump and control its outlet pressure to be 0.2 MPa above the condensate header pressure at the condensate pump outlet before startup to ensure a stable supply of sealing water to the pump. After a 10-second delay, gradually adjust the frequency to control the variable frequency booster pump outlet pressure to 1.4-1.8 MPa.

[0041] 3) Check if the A / B sealing valve is greater than 80%; the variable frequency pump outlet pressure is less than 1.4 MPa. If either of these conditions is met, proceed to step 4).

[0042] 4) Start the condensate transfer pump.

[0043] 5) Check if the A / B sealing valve is greater than 90%; if the variable frequency booster pump trips, and either of these conditions is met, then proceed to step 6).

[0044] 6) Open the pressure reducing valve and use the emergency pipeline.

[0045] Reference Figure 2 This embodiment provides a water supply pump sealing system, including a condensate header at the condensate pump outlet for directly supplying sealing water to the pump; a backup pipeline for pressurizing and supplying sealing water to the pump when needed; the condensate header at the condensate pump outlet delivers sealing water to the backup pipeline via a pipeline; a variable frequency booster pump is used to pressurize the water in the condensate header at the condensate pump outlet and supply it to the pump sealing water; the variable frequency booster pump is connected to the condensate header at the condensate pump outlet via a pipeline.

[0046] The condensate header at the pump outlet directly supplies the pump sealing water, serving as the main water source and providing a stable and sufficient flow of sealing water to ensure that the feedwater pump can receive adequate cooling and sealing during normal operation.

[0047] The backup pipeline supplies seal water to the pump via the condensate header at the condensate pump outlet. This enhances the system's redundancy and reliability, ensuring a reliable seal water supply even when the main water source pressure is insufficient or the unit load is low, thus preventing equipment failure.

[0048] The variable frequency booster pump pressurizes the water from the condensate header at the condensate pump outlet and supplies it to the pump sealing water. The output pressure is dynamically adjusted according to actual needs to maintain the sealing water pressure within the set range (1.4-1.8MPa), ensuring sealing effect and achieving energy saving and consumption reduction. By controlling the sealing water pressure within the range of 1.4-1.8MPa, it can be ensured that even under unit load fluctuations or condensate header pressure changes, the sealing water can still effectively prevent high-pressure water leakage and guarantee the sealing performance of the system.

[0049] A pressure measuring point is installed at the outlet of the variable frequency booster pump to monitor and provide feedback on the pump outlet pressure data in real time.

[0050] The condensate header at the condensate pump outlet supplies sealing water to the backup pipeline and is connected to the variable frequency booster pump.

[0051] Real-time monitoring of unit load signals, condensate outlet condensate header pressure, and sealing valve opening is used to determine whether preset conditions (e.g., unit load < 254 MW or P1 < 1 MPa) are met.

[0052] When the preset conditions are met, the variable frequency booster pump is started, and its initial output pressure is set to the condensate header pressure at the condensate pump outlet plus 0.2 MPa (i.e., P1 + 0.2 MPa). This step aims to quickly increase the pressure of the sealing water to cope with low pressure situations. After 10 seconds, the output pressure of the variable frequency booster pump is further adjusted to the set range (1.4-1.8 MPa). This step ensures that the sealing water pressure is stable within a safe and effective range, guaranteeing the sealing effect.

[0053] Further determine whether the variable frequency booster pump needs to be started based on the opening of the sealing valve (greater than 80%) or the outlet pressure of the booster pump (less than 1.4MPa).

[0054] Reference Figure 2 This embodiment provides a water supply pump sealing system, including a condensate outlet condensate header pipe connected to a fine treatment system via a pipeline at one end, and a condensate pump connected to the fine treatment system via a pipeline at the other end; the fine treatment system is used for water purification to ensure the quality of the sealing water.

[0055] The condensate pump is used to provide sealing water to the condensate header at the condensate pump outlet. The pressure measurement point is installed on the condensate header at the condensate pump outlet and at the outlet position of the variable frequency booster pump to monitor and provide feedback on the header pressure and pump outlet pressure in real time.

[0056] The condensate pump supplies sealing water to the condensate header at its outlet, ensuring a sufficient water supply to the pump sealing system and maintaining its normal operation. The fine treatment system purifies the condensate from the condensate pump, ensuring the quality of the sealing water by removing impurities, dissolved salts, and other harmful components. This prevents these substances from affecting equipment performance or causing corrosion, ensuring the sealing water is pure and suitable for long-term use.

[0057] Pressure measurement points are installed on the condensate header at the outlet of the condensate pump and at the outlet of the variable frequency booster pump. These points are used to detect and provide feedback on the header pressure and pump outlet pressure in real time, providing accurate pressure data to help the control system dynamically adjust the working state of the variable frequency booster pump according to the actual working conditions. This ensures that the sealing water pressure remains stable within the set range, thereby maintaining a good sealing effect.

[0058] In summary, the condensate pump delivers condensate to the condensate header at the pump outlet and then through pipelines to the condensate treatment system. During this process, the condensate pump is responsible for providing sufficient sealing water to the entire system. The condensate treatment system performs deep purification on the received condensate, removing impurities and harmful components to ensure the water quality meets the requirements for sealing water. The purified water is then delivered to the condensate header at the pump outlet, ready to be supplied to the feedwater pump for use as sealing water.

[0059] A pressure measuring point is installed on the condensate header at the outlet of the condensate pump, and the sensor monitors and feeds back the header pressure data in real time.

[0060] Reference Figure 2 This embodiment provides a water supply pump sealing system, including an emergency pipeline for supplying emergency sealing water to the pump when the first two sealing water lines are lost. The emergency pipeline includes: a water storage tank for storing emergency sealing water; a condensate transfer pump for transporting the sealing water from the water storage tank; and a pressure reducing valve for automatically adjusting the valve opening as needed to maintain the outlet pressure and flow rate. The condensate transfer pump is connected to the water storage tank via a pipeline, and the pressure reducing valve is installed on the output pipeline of the condensate transfer pump.

[0061] Among them, the emergency pipeline provides emergency sealing water to the feedwater pump when the first two sealing water lines (the condensate header at the condensate pump outlet and the backup pipeline provided by the variable frequency booster pump) are lost, providing the last line of defense and ensuring that the feedwater pump can still obtain sufficient sealing water in extreme cases to avoid equipment failure or damage.

[0062] The water storage tank is used to store emergency sealing water, ensuring sufficient water reserves so that sealing water can be quickly supplied in emergencies, ensuring continuous operation of the system.

[0063] The condensate transfer pump delivers the sealing water from the storage tank to the feed water pump. Through the pumping mechanism, it overcomes pipeline resistance and ensures that the sealing water can be delivered stably and quickly to where it is needed.

[0064] The pressure reducing valve automatically adjusts the valve opening as needed to maintain the set outlet pressure and flow rate, preventing problems caused by excessively high or low outlet pressure, ensuring that the pressure and flow rate of the sealing water meet the system requirements, and guaranteeing the sealing effect.

[0065] In summary, when it is confirmed that the emergency pipeline needs to be activated, the control system will automatically activate the condensate transfer pump. At this time, the condensate transfer pump begins to draw emergency sealing water from the storage tank and delivers it to the feed water pump through the pipeline.

[0066] A pressure-reducing valve is installed on the output pipeline of the condensate transfer pump. This valve automatically adjusts its opening according to actual needs to maintain the set outlet pressure and flow rate. If the outlet pressure of the condensate transfer pump is too high, the pressure-reducing valve will automatically open further to reduce the pressure; conversely, it will do so if the outlet pressure is too low.

[0067] The pressure reducing valve ensures that even in emergency situations, the pressure and flow rate of the sealing water remain within a safe and effective range, thereby guaranteeing the sealing effect of the water pump.

[0068] The emergency piping is designed to provide a final layer of protection for the water pump sealing system. By storing emergency sealing water in a storage tank, supplying sealing water via a condensate transfer pump, and maintaining appropriate outlet pressure and flow using a pressure reducing valve, the entire system can maintain a stable supply of sealing water even if the main water source fails. This multi-layered safety design not only improves system redundancy and reliability but also effectively prevents leaks under various operating conditions, ensuring the safe operation of the equipment.

[0069] Reference Figure 2 This embodiment provides a water supply pump sealing system, including a water supply pump sealing water component, used to prevent high-pressure water leakage from the inside of the water supply pump and to cool the bearings. The water supply pump sealing water component includes: a sealing water outlet, which is connected to the condensate outlet header of the condensate pump, a variable frequency booster pump, and a condensate delivery pump through a pipeline; and a sealing damper, which is used to dynamically adjust the amount of sealing water entering the sealing part of the water supply pump according to the actual needs of the system.

[0070] Among them, the water sealing component of the water pump prevents the leakage of high-pressure water inside the pump and cools the bearings. By providing high-quality sealing water, it ensures that the water pump can still operate safely and stably under high load and complex working conditions, thus extending the service life of the equipment.

[0071] The sealing water outlet connects to the condensate header of the condensate pump outlet, the variable frequency booster pump, and the condensate transfer pump via pipelines. This provides sealing water to the feedwater pump, ensuring that the sealing water can select the optimal supply path from multiple water sources, guaranteeing the continuity and stability of the sealing water supply. Whether from the main water source, backup pipeline, or emergency pipeline, the sealing water can smoothly reach the feedwater pump through the sealing water outlet.

[0072] The sealing valve dynamically adjusts the amount of sealing water entering the sealing part of the feed water pump according to the actual needs of the system. By precisely controlling the sealing water flow rate, the best sealing effect is ensured, and it can be flexibly adjusted according to different working conditions to avoid problems caused by excessive or insufficient sealing water.

[0073] The sealing valve dynamically adjusts the amount of sealing water entering the sealing part of the feed water pump according to actual needs. When the unit load is high or the demand for sealing water increases, the sealing valve will appropriately increase the opening and increase the flow rate of sealing water.

[0074] Conversely, when the load is low or the demand for sealing water is reduced, the sealing valve will reduce its opening and decrease the flow rate of sealing water to save resources and avoid unnecessary waste.

[0075] Through real-time monitoring and dynamic adjustment, the sealing valve ensures that the sealing water flow always meets the system requirements, thereby effectively preventing the leakage of high-pressure water from the pump and maintaining good cooling effect, protecting the bearings from high-temperature damage.

[0076] Reduce the risk of equipment failure due to insufficient sealing water and improve the reliability and safety of the system.

[0077] In summary, the feedwater pump's sealing water component is connected to multiple water sources (including the condensate header at the condensate pump outlet, the variable frequency booster pump, and the condensate transfer pump) through the sealing water outlet, ensuring a continuous supply of sealing water. The sealing regulating valve dynamically adjusts the sealing water volume according to the actual needs of the system, ensuring sealing effectiveness while achieving energy saving and consumption reduction. This design not only improves the system's flexibility and reliability but also ensures the safe and stable operation of the feedwater pump under various operating conditions.

[0078] This embodiment provides test data for a watertight seal test.

[0079] This scheme was implemented in a 600MW supercritical unit, which was equipped with two steam-driven feedwater pumps at 50% capacity. When the unit load dropped to 254MW, the control unit detected that the pressure in the main condensate header had dropped to 1MPa and automatically switched to the variable frequency booster pump to supply the pump sealing water, stabilizing the feedwater sealing water pressure. Simultaneously, a test was conducted where the variable frequency booster pump was manually stopped; the condensate transfer pump automatically started normally, the pressure reducing valve was engaged, and emergency feedwater sealing water was supplied to the pump.

[0080] Table 1: Test data for sealing water test

[0081]

[0082] As can be seen from the data in Table 1, when the unit load drops below 254MW, the system automatically switches to the variable frequency booster pump to supply sealing water. This indicates that the system can respond promptly and maintain a stable pressure for the sealing water supplied to the pump.

[0083] As can be seen from the data in Table 1, the variable frequency booster pump dynamically adjusts the output pressure according to actual needs, allowing the sealing water pressure to fluctuate between 1.4 and 1.8 MPa, which meets the preset requirements. In Comparative Example 8, although the unit load was low (242 MW), the sealing water pressure reached 1.42 MPa through the action of the variable frequency booster pump, which not only met the sealing requirements but also achieved the goal of energy saving and consumption reduction.

[0084] As can be seen from the data in Table 1, throughout the entire test process, whether switching from normal water supply to the variable frequency booster pump or further switching to the condensate transfer pump for emergency water supply, the sealing water parameters remained stable without any significant fluctuations or abnormalities. From Comparative Examples 1 to 10, the sealing water pressure remained within a reasonable range and was appropriately adjusted according to load changes, verifying that the system can achieve seamless switching.

[0085] The sealing valve dynamically adjusts its opening according to changes in system load, ensuring precise control of the sealing water volume and avoiding problems caused by excessive or insufficient water.

[0086] In summary, this solution ensures a stable supply of sealing water to the feedwater pump through multi-source water switching, dynamic adjustment, and an emergency response mechanism, thereby improving the system's reliability and safety. Especially under low-load conditions, the use of a variable frequency booster pump can effectively reduce energy consumption while maintaining sealing performance. Experimental results show that this design is not only safe and reliable but also possesses good adaptability and flexibility, suitable for the sealing needs of feedwater pumps under various complex operating conditions. Therefore, this solution demonstrates high feasibility and practicality.

[0087] Finally, it should be noted that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A method for controlling the seal of a water pump, characterized in that: include, System operating parameter monitoring includes unit load signal, condensate outlet condensate header pressure, and sealing valve opening; The variable frequency increases the pressure in the main pipe. Based on the system operating parameters, it is determined whether the preset conditions are met. When the preset conditions are met, the variable frequency booster pump is started and its initial output pressure is set. To maintain a stable seal, adjust the variable frequency booster pump to control the sealing water within a certain pressure range. Maintain the main pipe pressure, and further determine whether auxiliary equipment needs to be started based on the opening of the sealing valve or the outlet pressure of the booster pump. Emergency pipeline activation analysis: When the sealing valve opening reaches the set range or the variable frequency booster pump trips, the pressure reducing valve is opened to switch to the emergency pipeline.

2. The method for controlling the seal of a water pump according to claim 1, characterized in that: The initial output pressure of the variable frequency booster pump is set to be 0.2 MPa above the condensate header at the pump outlet at startup, and the initial output pressure is 1.4-1.8 MPa.

3. A water pump sealing system, comprising the water pump sealing control method as described in claim 1 or 2, characterized in that, include: The condensate header pipe (1) at the outlet of the condensate pump is used to directly supply the pump sealing water; The backup pipeline (2) can pressurize and supply the pump sealing water; The condensate header at the condensate pump outlet supplies sealing water to the backup pipeline via a pipeline.

4. The water pump sealing system according to claim 3, characterized in that, The backup pipeline (2) includes: The variable frequency booster pump (21) is used to pressurize the water in the condensate header (1) at the outlet of the condensate pump and supply it to the pump sealing water. The variable frequency booster pump (21) is connected to the condensate header pipe (1) at the outlet of the condensate pump via a pipeline.

5. The water pump sealing system according to claim 4, characterized in that, The backup pipeline (2) also includes: Pressure measurement point (22) is installed on the condensate header (1) at the outlet of the condensate pump and at the outlet position of the variable frequency booster pump (21) to detect and feedback the header pressure and pump outlet pressure in real time.

6. The water pump sealing system according to claim 5, characterized in that: The condensate mother pipe (1) at the outlet of the condensate pump is connected to a fine treatment system (11) via a pipe at one end, and the fine treatment system (11) is connected to a condensate pump (12) via a pipe at the other end. The fine treatment system (11) is used for water purification to ensure the quality of the sealed water; The condensate pump (12) is used to provide sealing water to the condensate header (1) at the outlet of the condensate pump.

7. The water pump sealing system according to claim 6, characterized in that, Also includes: Emergency pipeline (4) is used to supply pump sealing water in case the variable frequency booster pump (21) trips or the sealing valve (32) is greater than 90%.

8. The water pump sealing system according to claim 7, characterized in that, The emergency pipeline (4) includes: Water storage tank (41) is used to store emergency sealing water; A condensate transfer pump (42) is used to transfer the sealing water in the water storage tank (41); A pressure reducing valve (43) is used to automatically adjust the valve opening as needed to maintain the outlet pressure and flow rate. The condensate transfer pump (42) is connected to the water storage tank (41) through a pipeline. The pressure reducing valve (43) is installed on the output pipeline of the condensate transfer pump (42).

9. The water pump sealing system according to claim 8, characterized in that, Also includes: The water sealing component (3) of the water pump is used to prevent the leakage of high-pressure water inside the pump and to cool the bearings.

10. The water pump sealing system according to claim 6, characterized in that, The water supply pump sealing water component (3) includes: The sealed water outlet (31) is connected to the condensate outlet header (1), the variable frequency booster pump (21), and the condensate delivery pump (42) via a pipeline. The sealing valve (32) is used to dynamically adjust the amount of sealing water entering the sealing part of the water pump according to the actual needs of the system.

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