Intelligent control-based steam-driven feedwater pump seal water control method and apparatus

Abstract

Provided are an intelligent control-based steam-driven feedwater pump seal water control method and apparatus, relating to the technical field of feedwater pump sealing. The method comprises: according to technical parameters of a feedwater pump, a shaft seal type and a feedwater pump medium, determining a first seal water pressure demand (S101); defining an operating condition level of the feedwater pump and, on the basis of the operating condition level of the feedwater pump, determining a second seal water pressure demand (S102); according to the first seal water pressure demand and the second seal water pressure demand, determining a target seal water pressure demand (S103); acquiring a plurality of influence factors on a seal water flow rate, quantizing the plurality of influence factors, and dividing same into fixed influences and dynamic influences (S104); on the basis of the fixed influences and the dynamic influences, determining a target seal water flow rate demand (S105); and, according to a real-time flow rate and the target seal water flow rate demand, adjusting the seal water flow rate and, according to a real-time pressure and the target seal water pressure demand, adjusting a seal water pressure (S106). The present application improves the accuracy of the seal water pressure and flow rate, and ensures the precision and adaptability of sealing control, thus enhancing the sealing effect.

Description

A method and device for controlling sealing water of a steam-driven water supply pump based on intelligent control Technical Field

[0001] The present application relates to the technical field of water supply pump sealing, and more specifically, to a method and device for controlling sealing water of a pneumatic water supply pump based on intelligent control. Background Art

[0002] Intelligent control-based seal water control technology for pneumatic feedwater pumps incorporates elements such as an intelligent control system, sensing technology, frequency conversion technology, and intelligent algorithms. This technology automatically adjusts the seal water supply and pressure by monitoring sensor data in real time to adapt to varying operating conditions and load variations. The intelligent control system analyzes data using intelligent algorithms to set appropriate seal water pressure targets to ensure effective shaft sealing. Frequency conversion technology adjusts the pump speed to control water production and seal water supply, improving system energy efficiency. By integrating these technologies, the intelligent seal water control system achieves adaptive, efficient, and stable operation of pneumatic feedwater pumps, ensuring effective shaft sealing and proper equipment operation.

[0003] In the prior art, since there are many factors that affect the pressure and flow of sealing water, the sealing control accuracy is low and the sealing effect is poor.

[0004] Therefore, how to improve the sealing control accuracy is a technical problem that needs to be solved. Summary of the Invention

[0005] The present invention provides a method for controlling the sealing water of a steam-driven water supply pump based on intelligent control, which is used to solve the technical problem of low sealing control accuracy in the prior art. The method comprises:

[0006] Determine the first sealing water pressure requirement based on the technical parameters of the feed water pump, the shaft seal type and the feed water pump medium;

[0007] defining a working condition level of the water feed pump, and determining a second sealing water pressure requirement based on the working condition level of the water feed pump;

[0008] determining a target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement;

[0009] Obtain multiple influencing factors of sealing water flow, quantify the multiple influencing factors, and divide them into fixed influence and dynamic influence;

[0010] Determine target seal water flow requirements based on fixed and dynamic effects;

[0011] Monitor the real-time flow and real-time pressure of the sealing water of the water supply pump, adjust the sealing water flow according to the real-time flow and target sealing water flow demand, and adjust the sealing water pressure according to the real-time pressure and target sealing water pressure demand.

[0012] In some embodiments of the present application, determining the first sealing water pressure requirement based on the technical parameters of the water feed pump, the shaft seal type, and the medium of the water feed pump includes:

[0013] Determining a first sealing water pressure range and a second sealing water pressure range based on technical parameters of the feed water pump and a shaft seal type;

[0014] Determine a third sealing water pressure range according to the type of the water feed pump medium, and adjust the third sealing water pressure range according to the characteristics of the water feed pump medium to obtain a fourth sealing water pressure range;

[0015] The first sealing water pressure requirement is determined according to the first sealing water pressure range, the second sealing water pressure range, and the fourth sealing water pressure range.

[0016] In some embodiments of the present application, the third sealing water pressure range is adjusted according to the characteristics of the water supply pump medium to obtain a fourth sealing water pressure range, including:

[0017] Identify the influence of each characteristic of the water feed pump medium on the left endpoint value and the right endpoint value of the third sealing water pressure range, and divide the characteristics into left characteristics and right characteristics, wherein the left characteristic is the characteristic that affects the left endpoint value of the third sealing water pressure range, and the right characteristic is the characteristic that affects the right endpoint value of the third sealing water pressure range;

[0018] The left correction coefficient and the right correction coefficient are determined according to the left characteristic and the right characteristic respectively, and the left endpoint value and the right endpoint value of the third sealing water pressure range are corrected respectively by the left correction coefficient and the right correction coefficient to obtain the fourth sealing water pressure range.

[0019] In some embodiments of the present application, determining the first sealing water pressure requirement according to the first sealing water pressure range, the second sealing water pressure range, and the fourth sealing water pressure range includes:

[0020] If the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range have a common intersection, the sealing water pressure range of the intersection is used as the first sealing water pressure requirement;

[0021] Otherwise, the sealing water pressure range where there is a common intersection among the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range is taken as the initial sealing water pressure requirement, and the initial sealing water pressure requirement is adjusted according to the first sealing water pressure range or the second sealing water pressure range or the fourth sealing water pressure range where there is no intersection to obtain the first sealing water pressure requirement.

[0022] In some embodiments of the present application, the working condition level of the water supply pump is defined, including:

[0023] Obtain the operating parameters and load parameters of the water supply pump, and assign different weights to the load parameters and operating parameters respectively;

[0024] The total impact amount is determined based on the load parameters, operating parameters and corresponding weights, and the corresponding operating condition level of the water supply pump is determined according to the interval in which the total impact amount is located.

[0025] In some embodiments of the present application, determining the target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement includes:

[0026] If the first sealing water pressure requirement and the second sealing water pressure requirement have an intersection, the intersection sealing water pressure requirement is used as the target sealing water pressure requirement;

[0027] Otherwise, the middle values ​​of the first sealing water pressure requirement and the second sealing water pressure requirement are respectively used as the endpoint values ​​on both sides of the target sealing water pressure requirement.

[0028] In some embodiments of the present application, determining the target sealing water flow requirement based on the fixed influence and the dynamic influence includes:

[0029] Assign fixed weights corresponding to fixed effects and dynamic weights corresponding to dynamic effects respectively;

[0030] Determine the fixed impact amount based on the fixed impact and the fixed weight, and determine the dynamic impact amount based on the dynamic impact and the dynamic weight;

[0031] The target sealing water flow requirement is determined based on the fixed influence quantity and dynamic influence quantity.

[0032] Correspondingly, the present application also provides a sealing water control device for a steam-driven water supply pump based on intelligent control, the device comprising:

[0033] The first module is used to determine the first sealing water pressure requirement according to the technical parameters of the water feed pump, the shaft seal type and the water feed pump medium;

[0034] The second module is used to define the working condition level of the water supply pump and determine the second sealing water pressure requirement based on the working condition level of the water supply pump;

[0035] A third module is configured to determine a target sealing water pressure requirement based on the first sealing water pressure requirement and the second sealing water pressure requirement;

[0036] The fourth module is used to obtain multiple influencing factors of sealing water flow, quantify the multiple influencing factors, and divide them into fixed influence and dynamic influence;

[0037] a fifth module for determining a target sealing water flow requirement based on fixed effects and dynamic effects;

[0038] The sixth module is used to monitor the real-time flow and real-time pressure of the sealing water of the water supply pump, adjust the sealing water flow according to the real-time flow and target sealing water flow demand, and adjust the sealing water pressure according to the real-time pressure and target sealing water pressure demand.

[0039] By applying the above technical solution, the first sealing water pressure requirement is determined according to the technical parameters of the water feed pump, the shaft seal type, and the water feed pump medium; the working condition level of the water feed pump is defined, and the second sealing water pressure requirement is determined based on the working condition level of the water feed pump; the target sealing water pressure requirement is determined based on the first sealing water pressure requirement and the second sealing water pressure requirement; multiple influencing factors of the sealing water flow are obtained, quantified, and divided into fixed influences and dynamic influences; the target sealing water flow requirement is determined based on the fixed influences and dynamic influences; the real-time flow and real-time pressure of the sealing water of the water feed pump are monitored, and the sealing water flow is adjusted according to the real-time flow and the target sealing water flow requirement, and the sealing water pressure is adjusted according to the real-time pressure and the target sealing water pressure requirement. This improves the accuracy of the sealing water pressure and flow, ensures the sealing control precision and adaptability, and thus enhances the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0041] FIG1 shows a flow chart of a method for controlling sealing water of a steam-driven feedwater pump based on intelligent control according to an embodiment of the present invention;

[0042] FIG2 shows a schematic structural diagram of a sealing water control device for a steam-driven water supply pump based on intelligent control according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] The embodiment of the present application provides a method for controlling sealing water of a steam-driven feedwater pump based on intelligent control, as shown in FIG1 . The method includes the following steps:

[0045] Step S101 : determining a first sealing water pressure requirement according to technical parameters of a water feed pump, a shaft seal type, and a medium of the water feed pump.

[0046] In this embodiment, the technical parameters of the water feed pump are the technical parameters of the water feed pump and the manufacturer's recommendations. This information can usually be found in the manual and technical documentation of the equipment. Including the maximum allowable sealing water pressure, the minimum required sealing water pressure, etc. Different shaft seal types may have different requirements for sealing water pressure. For example, mechanical seals and hydraulic seals may require different sealing water pressures. Set corresponding goals based on the type of shaft seal used. The fluid or liquid transported by the water feed pump. Different liquids have different chemical properties, temperature, viscosity and other characteristics, which may affect the behavior of the liquid in the shaft seal and the sealing effect.

[0047] In some embodiments of the present application, determining the first sealing water pressure requirement based on the technical parameters of the water feed pump, the shaft seal type, and the medium of the water feed pump includes:

[0048] Determining a first sealing water pressure range and a second sealing water pressure range based on technical parameters of the feed water pump and a shaft seal type;

[0049] Determine a third sealing water pressure range according to the type of the water feed pump medium, and adjust the third sealing water pressure range according to the characteristics of the water feed pump medium to obtain a fourth sealing water pressure range;

[0050] The first sealing water pressure requirement is determined according to the first sealing water pressure range, the second sealing water pressure range, and the fourth sealing water pressure range.

[0051] In some embodiments of the present application, the third sealing water pressure range is adjusted according to the characteristics of the water supply pump medium to obtain a fourth sealing water pressure range, including:

[0052] Identify the influence of each characteristic of the water feed pump medium on the left endpoint value and the right endpoint value of the third sealing water pressure range, and divide the characteristics into left characteristics and right characteristics, wherein the left characteristic is the characteristic that affects the left endpoint value of the third sealing water pressure range, and the right characteristic is the characteristic that affects the right endpoint value of the third sealing water pressure range;

[0053] The left correction coefficient and the right correction coefficient are determined according to the left characteristic and the right characteristic respectively, and the left endpoint value and the right endpoint value of the third sealing water pressure range are corrected respectively by the left correction coefficient and the right correction coefficient to obtain the fourth sealing water pressure range.

[0054] In some embodiments of the present application, determining the first sealing water pressure requirement according to the first sealing water pressure range, the second sealing water pressure range, and the fourth sealing water pressure range includes:

[0055] If the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range have a common intersection, the sealing water pressure range of the intersection is used as the first sealing water pressure requirement;

[0056] Otherwise, the sealing water pressure range where there is a common intersection among the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range is taken as the initial sealing water pressure requirement, and the initial sealing water pressure requirement is adjusted according to the first sealing water pressure range or the second sealing water pressure range or the fourth sealing water pressure range where there is no intersection to obtain the first sealing water pressure requirement.

[0057] In this embodiment, correcting the left and right endpoint values ​​of the third sealing water pressure range using the left correction coefficient and the right correction coefficient, respectively, refers to multiplying the original endpoint values ​​by the correction coefficients to perform the correction. Adjusting the initial sealing water pressure requirement based on the non-intersecting first sealing water pressure range, the second sealing water pressure range, or the fourth sealing water pressure range refers to adjusting the initial sealing water pressure requirement based on the range values, for example, by taking the average of the two ranges.

[0058] Step S102: defining the working condition level of the water supply pump, and determining the second sealing water pressure requirement based on the working condition level of the water supply pump.

[0059] In this embodiment, different working conditions (mainly load) of the water supply pump have different requirements for the sealing water pressure.

[0060] In some embodiments of the present application, the working condition level of the water supply pump is defined, including:

[0061] Obtain the operating parameters and load parameters of the water supply pump, and assign different weights to the load parameters and operating parameters respectively;

[0062] The total impact amount is determined based on the load parameters, operating parameters and corresponding weights, and the corresponding operating condition level of the water supply pump is determined according to the interval in which the total impact amount is located.

[0063] In this embodiment, the operating parameters are operating parameters such as temperature, pressure, and power of the water supply pump.

[0064] In this embodiment, the total impact is determined mainly based on the load and supplemented by other operating parameters, and different total impacts correspond to different operating condition levels.

[0065] Step S103: determining a target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement.

[0066] In this embodiment, the target sealing water pressure requirement is determined based on a comprehensive consideration of the first sealing water pressure requirement (water feed pump design condition, sealing condition) and the second sealing water pressure requirement (water feed pump operating condition).

[0067] In some embodiments of the present application, determining the target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement includes:

[0068] If the first sealing water pressure requirement and the second sealing water pressure requirement have an intersection, the intersection sealing water pressure requirement is used as the target sealing water pressure requirement;

[0069] Otherwise, the middle values ​​of the first sealing water pressure requirement and the second sealing water pressure requirement are respectively used as the endpoint values ​​on both sides of the target sealing water pressure requirement.

[0070] Step S104: obtaining multiple influencing factors of the sealing water flow, quantifying the multiple influencing factors, and dividing them into fixed influences and dynamic influences.

[0071] In this embodiment, the multiple influencing factors include the following:

[0072] Shaft seal type: Different types of shaft seals (such as mechanical seals and hydraulic seals) have different requirements for sealing water. Different shaft seal structures and working principles will affect the amount of sealing water used.

[0073] Medium properties: The characteristics of the medium being transported will affect the requirements for sealing water. Some media may cause corrosion or wear to the shaft seal, requiring more sealing water to cool and protect the shaft seal.

[0074] Environmental conditions: Ambient temperature and humidity will also affect the evaporation and loss rate of seal water. In high temperature environments, more seal water may be required to maintain the temperature of the shaft seal.

[0075] Shaft seal friction: Shaft seal friction will generate heat, so sufficient sealing water is needed to cool the shaft seal and prevent wear caused by friction.

[0076] Pump speed: The higher the pump speed, the greater the friction and heat generation, so more seal water may be required at high speeds.

[0077] Equipment design parameters: The design parameters of the water supply pump, such as the sealing chamber volume, sealing structure, etc., will also affect the demand for sealing water.

[0078] Running time: The length of time the feedwater pump is running will also affect the demand for sealing water. Long-term operation may require more sealing water to maintain a stable shaft seal state.

[0079] In this embodiment, fixed influence refers to an influence factor that does not change, such as a design parameter, and dynamic influence refers to an influence factor that changes, such as a rotational speed.

[0080] Step S105 : determining the target sealing water flow requirement based on the fixed influence and the dynamic influence.

[0081] In some embodiments of the present application, determining the target sealing water flow requirement based on the fixed influence and the dynamic influence includes:

[0082] Assign fixed weights corresponding to fixed effects and dynamic weights corresponding to dynamic effects respectively;

[0083] Determine the fixed impact amount based on the fixed impact and the fixed weight, and determine the dynamic impact amount based on the dynamic impact and the dynamic weight;

[0084] The target sealing water flow requirement is determined based on the fixed influence quantity and dynamic influence quantity.

[0085] Step S106, monitor the real-time flow and real-time pressure of the sealing water of the water supply pump, adjust the sealing water flow according to the real-time flow and the target sealing water flow demand, and adjust the sealing water pressure according to the real-time pressure and the target sealing water pressure demand.

[0086] By applying the above technical solution, the first sealing water pressure requirement is determined according to the technical parameters of the water feed pump, the shaft seal type, and the water feed pump medium; the working condition level of the water feed pump is defined, and the second sealing water pressure requirement is determined based on the working condition level of the water feed pump; the target sealing water pressure requirement is determined based on the first sealing water pressure requirement and the second sealing water pressure requirement; multiple influencing factors of the sealing water flow are obtained, quantified, and divided into fixed influences and dynamic influences; the target sealing water flow requirement is determined based on the fixed influences and dynamic influences; the real-time flow and real-time pressure of the sealing water of the water feed pump are monitored, and the sealing water flow is adjusted according to the real-time flow and the target sealing water flow requirement, and the sealing water pressure is adjusted according to the real-time pressure and the target sealing water pressure requirement. This improves the accuracy of the sealing water pressure and flow, ensures the sealing control precision and adaptability, and thus enhances the sealing effect.

[0087] Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention can be implemented via hardware or via software combined with a necessary general-purpose hardware platform. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product. This software product can be stored on a non-volatile storage medium (such as a CD-ROM, USB flash drive, or external hard drive) and includes instructions for enabling a computer device (such as a personal computer, server, or network device) to execute the methods described in various implementation scenarios of the present invention.

[0088] Correspondingly, the present application also provides a sealing water control device for a steam-driven water supply pump based on intelligent control, as shown in FIG2 , the device comprising:

[0089] The first module 201 is used to determine the first sealing water pressure requirement according to the technical parameters of the water feed pump, the shaft seal type and the water feed pump medium;

[0090] The second module 202 is used to define the working condition level of the water supply pump and determine the second sealing water pressure requirement based on the working condition level of the water supply pump;

[0091] The third module 203 is configured to determine a target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement;

[0092] The fourth module 204 is used to obtain multiple influencing factors of the sealing water flow, quantify the multiple influencing factors, and divide them into fixed influence and dynamic influence;

[0093] The fifth module 205 is used to determine the target sealing water flow requirement based on the fixed influence and the dynamic influence;

[0094] The sixth module 206 is used to monitor the real-time flow and real-time pressure of the sealing water of the water supply pump, adjust the sealing water flow according to the real-time flow and the target sealing water flow demand, and adjust the sealing water pressure according to the real-time pressure and the target sealing water pressure demand.

[0095] In some embodiments of the present application, the first module 201 is used to:

[0096] Determining a first sealing water pressure range and a second sealing water pressure range based on technical parameters of the feed water pump and a shaft seal type;

[0097] Determine a third sealing water pressure range according to the type of the water feed pump medium, and adjust the third sealing water pressure range according to the characteristics of the water feed pump medium to obtain a fourth sealing water pressure range;

[0098] The first sealing water pressure requirement is determined according to the first sealing water pressure range, the second sealing water pressure range, and the fourth sealing water pressure range.

[0099] In some embodiments of the present application, the first module 201 is used to:

[0100] Identify the influence of each characteristic of the water feed pump medium on the left endpoint value and the right endpoint value of the third sealing water pressure range, and divide the characteristics into left characteristics and right characteristics, wherein the left characteristic is the characteristic that affects the left endpoint value of the third sealing water pressure range, and the right characteristic is the characteristic that affects the right endpoint value of the third sealing water pressure range;

[0101] The left correction coefficient and the right correction coefficient are determined according to the left characteristic and the right characteristic respectively, and the left endpoint value and the right endpoint value of the third sealing water pressure range are corrected respectively by the left correction coefficient and the right correction coefficient to obtain the fourth sealing water pressure range.

[0102] In some embodiments of the present application, the first module 201 is used to:

[0103] If the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range have a common intersection, the sealing water pressure range of the intersection is used as the first sealing water pressure requirement;

[0104] Otherwise, the sealing water pressure range where there is a common intersection among the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range is taken as the initial sealing water pressure requirement, and the initial sealing water pressure requirement is adjusted according to the first sealing water pressure range or the second sealing water pressure range or the fourth sealing water pressure range where there is no intersection to obtain the first sealing water pressure requirement.

[0105] In some embodiments of the present application, the second module 202 is configured to:

[0106] Obtain the operating parameters and load parameters of the water supply pump, and assign different weights to the load parameters and operating parameters respectively;

[0107] The total impact amount is determined based on the load parameters, operating parameters and corresponding weights, and the corresponding operating condition level of the water supply pump is determined according to the interval in which the total impact amount is located.

[0108] In some embodiments of the present application, the third module 203 is used to:

[0109] If the first sealing water pressure requirement and the second sealing water pressure requirement have an intersection, the intersection sealing water pressure requirement is used as the target sealing water pressure requirement;

[0110] Otherwise, the middle values ​​of the first sealing water pressure requirement and the second sealing water pressure requirement are respectively used as the endpoint values ​​on both sides of the target sealing water pressure requirement.

[0111] In some embodiments of the present application, the fifth module 205 is used to:

[0112] Assign fixed weights corresponding to fixed effects and dynamic weights corresponding to dynamic effects respectively;

[0113] Determine the fixed impact amount based on the fixed impact and the fixed weight, and determine the dynamic impact amount based on the dynamic impact and the dynamic weight;

[0114] The target sealing water flow requirement is determined based on the fixed influence quantity and dynamic influence quantity.

[0115] Those skilled in the art will appreciate that the modules in the devices in the implementation scenario can be distributed in the devices of the implementation scenario according to the implementation scenario description, or can be modified accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module or further split into multiple submodules.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling sealing water of a steam-driven water supply pump based on intelligent control, characterized in that: The method comprises: Determine the first sealing water pressure requirement based on the technical parameters of the feed water pump, the shaft seal type and the feed water pump medium; defining an operating level of the water feed pump, and determining a second sealing water pressure requirement based on the operating level of the water feed pump; Determining a target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement; Obtain multiple influencing factors of sealing water flow, quantify the multiple influencing factors, and divide them into fixed influence and dynamic influence; Determine target seal water flow requirements based on fixed and dynamic effects; Monitor the real-time flow and real-time pressure of the sealing water of the water supply pump, adjust the sealing water flow according to the real-time flow and target sealing water flow demand, and adjust the sealing water pressure according to the real-time pressure and target sealing water pressure demand.

2. The method for controlling sealing water of a steam-driven water supply pump based on intelligent control according to claim 1, characterized in that: Determine the first sealing water pressure requirement based on the technical parameters of the feed pump, the shaft seal type and the feed pump medium, including: Determine a first sealing water pressure range and a second sealing water pressure range based on technical parameters of the feed water pump and a shaft seal type; Determine a third sealing water pressure range according to the type of the water feed pump medium, and adjust the third sealing water pressure range according to the characteristics of the water feed pump medium to obtain a fourth sealing water pressure range; The first sealing water pressure requirement is determined according to the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range.

3. The method for controlling sealing water of a steam-driven water supply pump based on intelligent control according to claim 2, characterized in that: The third sealing water pressure range is adjusted according to the characteristics of the water supply pump medium to obtain a fourth sealing water pressure range, including: Confirm the influence of each characteristic of the water supply pump medium on the left endpoint value and the right endpoint value of the third sealing water pressure range, and divide the characteristics into left characteristics and right characteristics, wherein the left characteristic is the characteristic that affects the left endpoint value of the third sealing water pressure range, and the right characteristic is the characteristic that affects the right endpoint value of the third sealing water pressure range; The left correction coefficient and the right correction coefficient are determined according to the left characteristic and the right characteristic respectively, and the left endpoint value and the right endpoint value of the third sealing water pressure range are corrected respectively by the left correction coefficient and the right correction coefficient to obtain the fourth sealing water pressure range.

4. The method for controlling sealing water of a steam-driven water supply pump based on intelligent control according to claim 3, characterized in that: Determining the first sealing water pressure requirement according to the first sealing water pressure range, the second sealing water pressure range, and the fourth sealing water pressure range includes: If the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range have a common intersection, the sealing water pressure range of the intersection is used as the first sealing water pressure requirement; Otherwise, the sealing water pressure range where there is a common intersection among the first sealing water pressure range, the second sealing water pressure range and the fourth sealing water pressure range is taken as the initial sealing water pressure requirement, and the initial sealing water pressure requirement is adjusted according to the first sealing water pressure range or the second sealing water pressure range or the fourth sealing water pressure range where there is no intersection, to obtain the first sealing water pressure requirement.

5. The method for controlling sealing water of a steam-driven water supply pump based on intelligent control according to claim 1, characterized in that: Define the operating level of the feedwater pump, including: Obtain the operating parameters and load parameters of the water supply pump, and assign different weights to the load parameters and operating parameters respectively; The total impact amount is determined based on the load parameters, operating parameters and corresponding weights, and the corresponding operating level of the water supply pump is determined according to the interval in which the total impact amount is located.

6. The method for controlling sealing water of a steam-driven water supply pump based on intelligent control according to claim 1, characterized in that: Determining a target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement includes: If the first sealing water pressure requirement and the second sealing water pressure requirement have an intersection, the sealing water pressure requirement of the intersection is used as the target sealing water pressure requirement; Otherwise, the middle value between the first sealing water pressure requirement and the second sealing water pressure requirement is used as the endpoint values ​​of the target sealing water pressure requirement.

7. The method for controlling sealing water of a steam-driven water supply pump based on intelligent control according to claim 1, characterized in that: Determine target seal water flow requirements based on fixed and dynamic effects, including: Assign fixed weights corresponding to fixed impacts and dynamic weights corresponding to dynamic impacts respectively; Determine the fixed impact amount based on the fixed impact and the fixed weight, and determine the dynamic impact amount based on the dynamic impact and the dynamic weight; The target sealing water flow requirement is determined based on the fixed influence quantity and the dynamic influence quantity.

8. A sealing water control device for a steam-driven water supply pump based on intelligent control, characterized in that: The device comprises: The first module is used to determine the first sealing water pressure requirement according to the technical parameters of the feed water pump, the shaft seal type and the feed water pump medium; The second module is used to define the working condition level of the water feed pump and determine the second sealing water pressure requirement based on the working condition level of the water feed pump; A third module is used to determine a target sealing water pressure requirement according to the first sealing water pressure requirement and the second sealing water pressure requirement; The fourth module is used to obtain multiple influencing factors of the sealing water flow, quantify the multiple influencing factors, and divide them into fixed influence and dynamic influence; a fifth module for determining a target sealing water flow requirement based on fixed influences and dynamic influences; The sixth module is used to monitor the real-time flow and real-time pressure of the sealing water of the water supply pump, adjust the sealing water flow according to the real-time flow and target sealing water flow demand, and adjust the sealing water pressure according to the real-time pressure and target sealing water pressure demand.

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