Condensate pump mechanical seal protection system and control method thereof

Abstract

The invention relates to a condensate pump mechanical seal protection system and a control method thereof, the control method is applied to the condensate pump mechanical seal protection system, and the condensate pump mechanical seal protection system is applied to a nuclear power conventional island demineralized water pipeline system. On the condensate pump mechanical seal protection system, the pressure value of demineralized water in front of a condenser before entering the condenser and the pressure of the condensate pump at a mechanical seal end are respectively detected through a detection device, so that the corresponding pressure values of the demineralized water in front of the condenser when the mechanical seal end is at the lowest pressure value and the highest pressure value are determined; in the subsequent control process, the condensate pump is controlled to work by monitoring the pressure value of the desalted water in front of the condenser, and the pressure of the condensate pump at the mechanical seal end is prevented from being too large or too low; therefore, the complexity of manually and repeatedly detecting the pressure of the mechanical seal end is avoided, the detection precision is improved, the timeliness of pressure detection is ensured, and when the detection result is abnormal, the condensate pump can be controlled by the control device to timely and protectively stop.

Description

Technical Field

[0001] The invention relates to the field of nuclear power, and in particular to a condensate pump seal protection system and a control method thereof. Background Art

[0002] During the construction of a nuclear power plant, especially during the secondary loop flushing phase, the condensate pump (CEX pump for short) is part of the condensate extraction system of the nuclear power plant. The integrity of its mechanical seal is crucial to preventing fluid leakage and impurities from entering the pump body.

[0003] In the early stage of construction, i.e. the secondary circuit flushing stage, the condensate system itself has not been completely flushed and the water quality does not meet the standard, so the seal water required by the CEX pump cannot be directly obtained from the pump outlet pipe. At this time, the seal water is usually provided by the conventional island demineralized water distribution system (SER). However, if the seal water pressure provided by the SER is too low, it may not be able to maintain the effective operation of the seal, thus causing damage to the pump.

[0004] The traditional approach is to install a mechanical instrument on the mechanical seal system to detect the pressure of the mechanical seal water. However, this method has obvious disadvantages: on the one hand, it relies on manual on-site reading of the instrument value regularly and judging whether the pressure is within the normal range, which not only consumes a lot of human resources, but also fails to achieve continuous and real-time pressure detection; on the other hand, when the pressure of the mechanical seal water is lower than the protection value, the system has no automatic protection measures to stop the operation of the CEX pump. If the CEX pump continues to operate under this condition, it may cause damage to the mechanical seal, which in turn causes system medium leakage and shortens the service life of the pump. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a condensate pump seal protection system and a control method thereof, which can solve the problems of cumbersome, inaccurate and untimely seal water pressure detection and inability to shut down for protection.

[0006] A first aspect of the present invention provides a condensate pump seal protection system, comprising:

[0007] The transmission device comprises a first pipeline, a second pipeline, a pump-out pipeline, an auxiliary pipeline and a return pipeline, wherein the return pipeline is connected to the pump-out pipeline and the auxiliary pipeline respectively;

[0008] A condensate pumping device, comprising a condenser and a condensate pump, wherein the first pipeline is connected to the condenser, the second pipeline is connected to the condenser and the input end of the condensate pump respectively, the pump-out pipeline is connected to the output end of the condensate pump, and the auxiliary pipeline is connected to the first pipeline and the machine-sealed end of the condensate pump respectively;

[0009] A detection device, comprising a first pressure detection element provided on the first pipeline and a second pressure detection element provided on the auxiliary pipeline; and

[0010] The control device is electrically connected to the first pressure detection component and the condensate pump respectively, and the control device controls the on and off of the condensate pump according to the pre-condensation pressure signal of the first pressure detection component.

[0011] Preferably, a detection position and a reflux position are provided on the auxiliary pipeline, the second pressure detection component is provided on the detection position, and the reflux pipeline is connected to the reflux position.

[0012] Preferably, the detection position is arranged between the reflux position and the machine sealing end.

[0013] Preferably, the distance between the detection position and the machine sealing end is smaller than the distance between the first pressure detection component and the machine sealing end.

[0014] Preferably, the second pressure detecting member is an on-site pressure gauge.

[0015] Preferably, the first pressure detecting component includes a pressure transmitter, and the pressure transmitter is arranged on the first pipeline.

[0016] Preferably, the control device comprises a control module and a timing module, the control module is electrically connected to the first pressure detection component and the condensate pump, respectively, and the timing module is electrically connected to the control module.

[0017] The second aspect of the present invention further provides a condensate pump seal protection system control method, the condensate pump seal protection system control method is applied to the condensate pump seal protection system described in any one of the above technical solutions;

[0018] The control method of the condensate pump seal protection system comprises the following steps:

[0019] S01, obtaining the pressure value of desalted water before the condenser through the first pressure detection component, and obtaining the pressure value of the mechanical seal through the second pressure detection component;

[0020] S02, matching the desalted water pressure value before each condenser with each mechanical seal pressure value to obtain a plurality of pressure matching group values;

[0021] S03, matching the minimum water seal pressure requirement value with the pressure matching group value, and determining the minimum desalted water pressure value before the condenser according to the matched pressure matching group value;

[0022] S04. Use the control device to obtain the real-time pressure value of the desalted water before the condenser through the first pressure detection component. When the real-time pressure value of the desalted water before the condenser is less than or equal to the minimum pressure value of the desalted water before the condenser, the condensate pump is controlled to shut down through the control device.

[0023] Preferably, the step S02 includes matching each of the desalted water pressure values ​​before the condenser with each of the mechanical seal pressure values ​​according to the measurement time to obtain a plurality of pressure matching group values.

[0024] Preferably, the step S03 further comprises matching the maximum water seal pressure requirement value with the pressure matching group value, and determining the maximum pre-condenser desalted water pressure value according to the matched pressure matching group value.

[0025] Preferably, the step S04 further comprises controlling the condensate pump to stop by the control device when the real-time pressure value of the desalted water before the condenser is greater than or equal to the maximum pressure value of the desalted water before the condenser.

[0026] Preferably, when the real-time desalted water pressure value before the condenser is greater than or equal to the maximum desalted water pressure value before the condenser and the duration exceeds T1, the condensate pump is controlled to shut down by the control device.

[0027] Preferably, when the real-time desalted water pressure value before the condenser is less than or equal to the minimum desalted water pressure value before the condenser and the duration exceeds T2, the condensate pump is controlled to shut down by the control device.

[0028] The implementation of the present invention has the following beneficial effects:

[0029] The present invention relates to a condensate pump seal protection system and a control method thereof. The control method is applied to the condensate pump seal protection system, and the condensate pump seal protection system is applied to the desalted water pipeline system of the conventional island of nuclear power. In the condensate pump seal protection system, a detection device is used to respectively detect the pressure value of the desalted water before entering the condenser and the pressure of the condensate pump at the seal end, so as to determine the pressure value of the desalted water before the condenser corresponding to the minimum pressure value and the maximum pressure value of the seal end, and then in the subsequent control process, the pressure value of the desalted water before the condenser is monitored to control the operation of the condensate pump, so as to prevent the pressure of the condensate pump at the seal end from being too high or too low;

[0030] In this way, the tediousness of repeated manual testing of the sealing end pressure of the machine is eliminated, the detection accuracy is improved, and the timeliness of the pressure detection is guaranteed. When the test result is abnormal, the condensate pump can be controlled by the control device to shut down in time for protection, ensuring the durability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0032] Figure 1 is a schematic structural diagram of a condensate pump seal protection system in some embodiments of the present invention;

[0033] Figure 2 is another structural schematic diagram of a condensate pump seal protection system in some embodiments of the present invention;

[0034] Figure 3 It is a flow chart of a control method of a condensate pump seal protection system in some embodiments of the present invention. DETAILED DESCRIPTION

[0035] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0036] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Figure 1 and Figure 2 A condensate pump seal protection system 10 in some embodiments of the present invention is shown. The condensate pump seal protection system is applied to the desalted water pipeline system of a conventional island of a nuclear power plant. The condensate pump seal protection system 10 includes a transmission device 1, a condensate pumping device 2, a detection device 3 and a control device.

[0040] The condensate pumping device 2 is transmitted through the transmission device 1, and the transmission device 1 plays the role of guiding the transmission. The condensate pumping device 2 plays the role of pumping. The detection device 3 is arranged on the transmission device 1, and the detection device 3 plays the role of detecting the pressure. The control device 4 is electrically connected to the condensate pumping device 2. The control device 4 plays the role of receiving the signal sent by the detection device 3 on the one hand, and also plays the role of controlling the condensate pumping device 2 on the other hand.

[0041] like Figures 1 to 3 As shown, the transmission device 1 includes a first pipeline 11, a second pipeline 12, a pump-out pipeline 13, an auxiliary pipeline 14 and a return pipeline 15, and the return pipeline 15 is connected to the pump-out pipeline 13 and the auxiliary pipeline 14 respectively.

[0042] It can be understood that the first pipeline 11, the second pipeline 12, the pump-out pipeline 13, the auxiliary pipeline 14 and the return pipeline 15 are all pipe bodies, and the interior of each pipeline can play a role in guiding transmission.

[0043] The condensate pumping device 2 includes a condenser 21 and a condensate pump 22, the first pipeline 11 is connected to the condenser 21, the second pipeline 12 is respectively connected to the condenser 21 and the input end 221 of the condensate pump 22, the pump-out pipeline 13 is connected to the output end 222 of the condensate pump 22, and the auxiliary pipeline 14 is respectively connected to the first pipeline 11 and the machine-sealed end 223 of the condensate pump 22.

[0044] It can be understood that the condenser 21 is a prior art. The condensate pump 22 is used to pressurize and pump the condensate collected from the condenser 21 .

[0045] The input end 221 is used to supply fluid into the condensate pump 22. The fluid is pressurized by the condensate pump 22 and then pumped out from the output end 222. The mechanical seal end 223 is the input position of water required for the mechanical seal of the condensate pump; specifically, water is input into the mechanical seal of the condensate pump 22 through the mechanical seal end 223 to ensure the normal operation of the condensate pump 22.

[0046] The detection device 3 includes a first pressure detection component 31 and a second pressure detection component 32 . The first pressure detection component 31 is disposed on the first pipeline 11 , and the second pressure detection component 32 is disposed on the auxiliary pipeline 14 .

[0047] It can be understood that both the first pressure detection member 31 and the second pressure detection member 32 are used to detect pressure. The first pressure detection member 31 is used to detect the pressure in the first pipeline 11 , and the second pressure detection member 32 is used to detect the pressure in the auxiliary pipeline 14 .

[0048] It should be noted that although the first pipeline 11 and the auxiliary pipeline 14 are interconnected, due to the relatively large size specifications of the condenser 21 itself and the complex facility layout in the application scenario, there is always a certain deviation between the pressure measured by the first pressure detection component 31 and the actual pressure of the machine seal end 223, that is, the pressure measured by the first pressure detection component 31 cannot be directly equated with the water supply pressure of the machine seal end 223.

[0049] The control device 4 is electrically connected to the first pressure detection component 31 and the condensate pump 22 respectively. The control device 4 receives the pre-condensation pressure signal of the first pressure detection component 31 and controls the condensate pump 22 to be turned on and off according to the pre-condensation pressure signal.

[0050] It is understandable that the control device 4 can be configured with a circuit board or other devices, mechanisms or components with control functions. The control device 4 can obtain the pressure in the pipe body (first pipeline 11) before the condenser according to the pre-condensation pressure signal measured by the first pressure detection element 31.

[0051] During use, the data measured by the first pressure detection component 31 (the pressure value before the desalted water enters the condenser) is paired with the data measured by the second pressure detection component 32 (the mechanical seal pressure value), and the data pairing method is that the desalted water pressure value and the mechanical seal pressure value before the condenser measured at the same time node are a set of data. In this way, the corresponding relationship between the desalted water pressure value before the condenser and the mechanical seal pressure value can be obtained, and the minimum desalted water pressure value before the condenser is determined according to the corresponding relationship and the minimum water supply pressure (minimum water seal pressure requirement value) required by the mechanical seal end of the condensate pump. Among them, when the pressure value measured by the first pressure detection component 31 is the minimum desalted water pressure value before the condenser, the water supply pressure at the mechanical seal end 223 reaches the minimum mechanical seal water supply pressure required for the normal operation of the condensate pump 22.

[0052] If the pre-condensation pressure signal measured by the first pressure detection component 31 shows that the pre-condensation water pressure value of the desalted water is lower than or equal to the minimum pre-condensation water pressure value of the desalted water, the control device 4 will control the condensate pump 22 to shut down, so as to protect the condensate pump 22 and prevent the mechanical seal from insufficient sealing and excessive wear.

[0053] It should also be noted that if the mechanical seal end 223 of the condensate pump 22 has a maximum water supply pressure value, the maximum pre-condenser desalted water pressure value can also be obtained based on the paired pre-condenser desalted water pressure value and the mechanical seal pressure value. Then, when the pressure value measured by the first pressure detection component 31 is greater than or equal to the maximum pre-condenser desalted water pressure value, the condensate pump 22 is controlled to shut down, etc., to avoid the condensate pump 22 working under an excessively high mechanical seal water supply pressure.

[0054] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system 10 , a detection position 141 and a reflux position 142 are provided on the auxiliary pipeline 14 , the second pressure detection component 32 is provided on the detection position 141 , and the reflux pipeline 15 is connected to the reflux position 142 .

[0055] It can be understood that the detection position 141 is used to install the second pressure detection member 32. The detection position 141 can be configured by various devices, mechanisms or components in the prior art that can install pressure measuring instruments or pressure measuring structures, and can be adaptively selected depending on the type of the second pressure detection member 32. The reflux position 142 is used to communicate with the end of the reflux pipeline 15. The reflux position 142 can be configured to have a notch for pipeline communication to connect to the reflux pipeline 15, and can also be configured to have a connecting vessel for pipeline communication.

[0056] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system 10 , the detection position 141 is disposed between the reflux position 142 and the seal end 223 .

[0057] It can be understood that the water input into the machine sealing end 223 comes from the return pipe 15 on the one hand and from the first pipe 11 on the other hand, and the detection position 141 is set between the return position 142 and the machine sealing end 223, so that the second pressure detection component 32 can specifically measure the pressure of the water that has converged and flowed to the machine sealing end 223, thereby improving the measurement accuracy of the second pressure detection component 32.

[0058] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system 10 , the distance between the detection position 141 and the seal end 223 is smaller than the distance between the first pressure detection component 31 and the seal end 223 .

[0059] It can be understood that through the content of this type of embodiment, the second pressure detection component 32 can be closer to the machine sealing end 223 than the first pressure detection component 31, so that the pressure measured by the second pressure detection component 32 is closer to the actual input pressure of the machine sealing end 223.

[0060] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system 10, the second pressure detection component 32 is a local pressure gauge.

[0061] It can be understood that the local pressure gauge can be directly installed at the location where the pressure needs to be detected to provide instant pressure readings, which is very practical for monitoring the pressure at the sealing end of the condensate pump.

[0062] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system 10 , the first pressure detection component 31 includes a pressure transmitter, and the pressure transmitter is disposed on the first pipeline 11 .

[0063] It can be understood that the pressure transmitter can convert the detected pressure changes into electrical signal output, realize the long-distance transmission of pressure information, eliminate the need for manual on-site observation and recording, and improve work efficiency. Secondly, the electrical signal can be easily connected to the control system or computer system to realize automatic detection and recording, which helps to achieve continuous and real-time pressure monitoring.

[0064] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system 10, the control device 4 includes a control module 41 and a timing module 42, the control module 41 is electrically connected to the first pressure detection component 31 and the condensate pump 22, and the timing module 42 is electrically connected to the control module 41.

[0065] It can be understood that the function of the control module 41 is to receive the pre-condensation pressure signal from the first pressure detection member 31, and decide whether to stop the condensate pump 22 based on these signals. When the detected pre-condenser desalted water pressure value is lower than the preset minimum pre-condenser desalted water pressure value, the control module 41 will instruct the condensate pump 22 to stop running to prevent the pump from being damaged due to insufficient water pressure at the machine seal end 223.

[0066] Figure 3 The condensate pump seal protection system control method in some embodiments of the present invention is shown, and the condensate pump seal protection system control method is applied to the condensate pump seal protection system 10. The condensate pump seal protection system control method includes the following steps:

[0067] S01, obtaining the pressure value of the desalted water before the condenser through the first pressure detection component 31, and obtaining the pressure value of the mechanical seal through the second pressure detection component 32;

[0068] It can be understood that the pressure value of the desalted water before the condenser is the pressure of the steam before entering the condenser for condensation, and the mechanical seal pressure value is the pressure of the water flowing into the mechanical seal end 223 of the condensate pump 22.

[0069] S02, matching the desalted water pressure value before each condenser with each mechanical seal pressure value to obtain a plurality of pressure matching group values;

[0070] It can be understood that each pressure matching group value includes a desalted water pressure value before the condenser and a mechanical seal pressure value.

[0071] S03, matching the minimum water seal pressure requirement value with the pressure matching group value, and determining the minimum desalted water pressure value before the condenser according to the matched pressure matching group value;

[0072] It can be understood that the minimum water seal pressure requirement value refers to the minimum water inlet pressure of the machine seal end 223 of the condensate pump 22. If the water pressure injected into the machine seal end 223 is lower than this pressure value, the machine seal of the condensate pump will be damaged.

[0073] S04. Use the control device 4 to obtain the real-time pressure value of the desalted water before the condenser through the first pressure detection component 31. When the real-time pressure value of the desalted water before the condenser is less than or equal to the minimum pressure value of the desalted water before the condenser, the control device 4 is used to control the condensate pump 22 to shut down.

[0074] It can be understood that the first pressure detection component 31 will detect the pressure of steam before entering the condenser in real time. When the real-time desalted water pressure value before the condenser is less than or equal to the minimum desalted water pressure value before the condenser, the control device 4 will control the condensate pump 22 to shut down, thereby preventing the condensate pump 22 from operating when the input water pressure of the machine seal end 223 is too low, thereby ensuring the normal operation of the condensate pump 22.

[0075] like Figures 1 to 3 As shown, in some embodiments of the condensate pump mechanical seal protection system control method, step S02 includes matching the desalted water pressure value before each condenser with each mechanical seal pressure value according to the measurement time to obtain a plurality of pressure matching group values.

[0076] It can be understood that in this type of embodiment, the desalted water pressure value and the mechanical seal pressure value before the condenser measured at the same time node or in the same time period are matched; that is, the desalted water pressure value and the mechanical seal pressure value before the condenser in each pressure matching group value are measured at the same time node or in the same time period. In this way, it can be ensured that the mechanical seal pressure of the mechanical seal end 223 can accurately correspond to the desalted water pressure value before the condenser, thereby ensuring that the mechanical seal pressure can be accurately inferred based on the measured desalted water pressure value before the condenser, thereby ensuring accurate control of the condensate pump 22.

[0077] like Figures 1 to 3As shown, in some embodiments of the condensate pump seal protection system control method, step S03 also includes matching the maximum water seal pressure requirement value with the pressure matching group value, and determining the maximum desalted water pressure value before the condenser according to the matched pressure matching group value.

[0078] It can be understood that the maximum water seal pressure requirement value refers to the maximum water inlet pressure of the machine seal end 223 of the condensate pump 22. If the pressure is higher than the maximum water seal pressure requirement value, the condensate pump 22 will be damaged. In this way, the desalted water pressure value before the condenser in the pressure matching group value corresponding to the maximum water seal pressure requirement value is the maximum desalted water pressure value before the condenser.

[0079] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system control method, step S04 also includes controlling the condensate pump 22 to shut down through the control device 4 when the real-time desalted water pressure value before the condenser is greater than or equal to the maximum desalted water pressure value before the condenser.

[0080] It can be understood that when the desalted water pressure value before the condenser measured by the first pressure detection component 31 is greater than or equal to the maximum desalted water pressure value before the condenser, the mechanical seal pressure of the mechanical seal end 223 reaches the rated maximum water inlet pressure, and the control device 4 controls the condensate pump 22 to shut down to prevent the mechanical seal pressure of the condensate pump 22 from being too high, which may cause abnormal operation or even damage of the condensate pump 22.

[0081] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system control method, when the real-time desalted water pressure value before the condenser is greater than or equal to the maximum desalted water pressure value before the condenser and the duration exceeds T1, the condensate pump 22 is controlled to shut down by the control device 4.

[0082] It can be understood that when the first pressure detection member 31 continuously measures the real-time desalted water pressure value before the condenser to be greater than or equal to the highest desalted water pressure value before the condenser within the time length T1, the control device 4 controls the condensate pump 22 to shut down. In this way, it can prevent the condensate pump 22 from unexpectedly shutting down due to a short-term fluctuation in the real-time desalted water pressure value before the condenser.

[0083] For example, T1 can be configured as 0.5 seconds, 1 second, 1.5 seconds, 2 seconds, 2.5 seconds, etc.

[0084] like Figures 1 to 3 As shown, in some embodiments of the condensate pump seal protection system control method, when the real-time desalted water pressure value before the condenser is less than or equal to the minimum desalted water pressure value before the condenser and the duration exceeds T2, the condensate pump 22 is controlled to shut down by the control device 4.

[0085] It can be understood that when the first pressure detection member 31 continuously measures the real-time desalted water pressure value before the condenser to be less than or equal to the highest desalted water pressure value before the condenser within the time length T2, the control device 4 controls the condensate pump 22 to shut down. In this way, it can prevent the condensate pump 22 from unexpectedly shutting down due to a short-term fluctuation in the real-time desalted water pressure value before the condenser.

[0086] For example, T2 can be configured to be 0.5 seconds, 1 second, 1.5 seconds, 2 seconds, 2.5 seconds, etc.

[0087] The implementation of the present invention has the following beneficial effects:

[0088] The present invention relates to a condensate pump seal protection system and a control method thereof. The control method is applied to the condensate pump seal protection system, and the condensate pump seal protection system is applied to the desalted water pipeline system of the conventional island of nuclear power. In the condensate pump seal protection system, a detection device is used to respectively detect the pressure value of the desalted water before entering the condenser and the pressure of the condensate pump at the seal end, so as to determine the pressure value of the desalted water before the condenser corresponding to the minimum pressure value and the maximum pressure value of the seal end, and then in the subsequent control process, the pressure value of the desalted water before the condenser is monitored to control the operation of the condensate pump, so as to prevent the pressure of the condensate pump at the seal end from being too high or too low;

[0089] In this way, the tediousness of repeated manual testing of the sealing end pressure of the machine is eliminated, the detection accuracy is improved, and the timeliness of the pressure detection is guaranteed. When the test result is abnormal, the condensate pump can be controlled by the control device to shut down in time for protection, ensuring the durability of the system.

[0090] The scheme of the present invention has been described in detail above with reference to the accompanying drawings. In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments. Those skilled in the art should also be aware that the actions and modules involved in the specification are not necessarily required for the present invention. In addition, it can be understood that the steps in the method of the embodiment of the present invention can be adjusted in order, merged and deleted according to actual needs, and the modules in the device of the embodiment of the present invention can be merged, divided and deleted according to actual needs.

[0091] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A condensate pump seal protection system, characterized in that: include: The transmission device comprises a first pipeline, a second pipeline, a pump-out pipeline, an auxiliary pipeline and a return pipeline, wherein the return pipeline is connected to the pump-out pipeline and the auxiliary pipeline respectively; A condensate pumping device, comprising a condenser and a condensate pump, wherein the first pipeline is connected to the condenser, the second pipeline is connected to the condenser and the input end of the condensate pump respectively, the pump-out pipeline is connected to the output end of the condensate pump, and the auxiliary pipeline is connected to the first pipeline and the machine-sealed end of the condensate pump respectively; A detection device, comprising a first pressure detection component provided on the first pipeline and a second pressure detection component provided on the auxiliary pipeline; and The control device is electrically connected to the first pressure detection component and the condensate pump respectively, and the control device controls the on and off of the condensate pump according to the pre-condensation pressure signal of the first pressure detection component.

2. The condensate pump seal protection system according to claim 1, characterized in that: The auxiliary pipeline is provided with a detection position and a reflux position, the second pressure detection component is provided at the detection position, and the reflux pipeline is connected to the reflux position.

3. The condensate pump seal protection system according to claim 2, characterized in that: The detection position is arranged between the reflux position and the machine sealing end.

4. The condensate pump seal protection system according to claim 3, characterized in that: The distance between the detection position and the machine sealing end is smaller than the distance between the first pressure detection component and the machine sealing end.

5. The condensate pump seal protection system according to any one of claims 1 to 4, characterized in that: The second pressure detection component is an on-site pressure gauge.

6. The condensate pump seal protection system according to claim 1, characterized in that: The first pressure detection component includes a pressure transmitter, and the pressure transmitter is arranged on the first pipeline.

7. The condensate pump seal protection system according to claim 1, characterized in that: The control device includes a control module and a timing module. The control module is electrically connected to the first pressure detection component and the condensate pump, respectively, and the timing module is electrically connected to the control module.

8. A condensate pump seal protection system control method, characterized in that: The control method of the condensate pump seal protection system is applied to the condensate pump seal protection system according to any one of claims 1 to 7; The condensate pump seal protection system control method comprises the following steps: S01, obtaining the pressure value of desalted water before the condenser through the first pressure detection component, and obtaining the pressure value of the mechanical seal through the second pressure detection component; S02, matching the desalted water pressure value before each condenser with each mechanical seal pressure value to obtain a plurality of pressure matching group values; S03, matching the minimum water seal pressure requirement value with the pressure matching group value, and determining the minimum desalted water pressure value before the condenser according to the matched pressure matching group value; S04. Use the control device to obtain the real-time pressure value of the desalted water before the condenser through the first pressure detection component. When the real-time pressure value of the desalted water before the condenser is less than or equal to the minimum pressure value of the desalted water before the condenser, the condensate pump is controlled to shut down through the control device.

9. The condensate pump seal protection system control method according to claim 8, characterized in that: The step S02 includes matching the desalted water pressure values ​​before the condenser with the mechanical seal pressure values ​​according to the measurement time to obtain a plurality of pressure matching group values.

10. The condensate pump seal protection system control method according to claim 8, characterized in that: The step S03 further includes matching the maximum water seal pressure requirement value with the pressure matching group value, and determining the maximum pre-condenser desalted water pressure value according to the matched pressure matching group value.

11. The condensate pump seal protection system control method according to claim 10, characterized in that: The step S04 also includes controlling the condensate pump to stop by the control device when the real-time pressure value of the desalted water before the condenser is greater than or equal to the maximum pressure value of the desalted water before the condenser.

12. The condensate pump seal protection system control method according to claim 11, characterized in that: When the real-time desalted water pressure value before the condenser is greater than or equal to the maximum desalted water pressure value before the condenser and the duration exceeds T1, the condensate pump is controlled to shut down by the control device.

13. The condensate pump seal protection system control method according to claim 8 or 12, characterized in that: When the real-time desalted water pressure value before the condenser is less than or equal to the minimum desalted water pressure value before the condenser and the duration exceeds T2, the condensate pump is controlled to shut down by the control device.

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