Cooling tower water volume intelligent adjusting system and adjusting method thereof

Abstract

The invention discloses a cooling tower water volume intelligent adjusting system and an adjusting method thereof, and relates to the technical field of cooling tower water volume adjustment. A target flow value, a current flow value, a current opening value of a water inlet valve and valve element operation duration data of the cooling tower water volume adjusting system are collected in real time; according to the target flow value and the current flow value, the cooling tower heat dissipation requirement, the circulating water temperature and the characteristics of a water inlet valve are combined, the target opening value of the water inlet valve is calculated, and the opening adjustment difference value is determined; the actual opening change curve of the water inlet valve is monitored, whether the deviation between the actual opening and the target opening in the preset adjustment time exceeds a set deviation threshold value or not is judged, and if yes, it is judged that the valve element is stuck; according to the method, a water volume fine adjustment scene is precisely defined, so that frequent and large-amplitude action of the valve is avoided, and valve element abrasion is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cooling tower water quantity regulation, and particularly relates to a cooling tower water quantity intelligent regulation system and a regulation method thereof. BACKGROUND

[0002] The cooling tower is a core equipment for circulating water heat dissipation in the fields of industry, commercial air conditioning, power generation, etc., and the scientificity and intelligence of water quantity regulation of the cooling tower are crucial to system energy consumption, equipment life and operation stability. At present, the cooling tower water quantity regulation is mainly in a manual or simple semi-automatic mode. Manual regulation requires a large amount of manual work, has a slow response, is difficult to adapt to environmental and load changes, and is prone to cause heat dissipation not in time or resource waste. The semi-automatic regulation is mostly based on the calculation of the opening degree according to the flow deviation, without considering the heat dissipation demand related factors such as circulating water temperature and environmental humidity, and without taking into account the characteristic changes of the inlet valve caused by scale, and is prone to the problems of "flow meeting the standard but abnormal heat dissipation" or "over-regulation / under-regulation".

[0003] More importantly, the traditional technology lacks a valve core fault monitoring and processing mechanism. The valve core is prone to be stuck due to scale and impurities, the existing system is difficult to distinguish between normal delay and sticking, slight sticking will aggravate the wear of the valve core, and serious sticking will cause heat dissipation failure; and there is no targeted descaling measure, which needs to be stopped for maintenance, increasing the cost and affecting the operation. Therefore, the research and development of an intelligent regulation method capable of accurately adapting to heat dissipation demand and processing valve core faults have become the key to industry upgrading. SUMMARY

[0004] The purpose of the present application is to provide a cooling tower water quantity intelligent regulation system and a regulation method thereof to solve the problems mentioned in the background.

[0005] In a first aspect, the present application provides a cooling tower water quantity intelligent regulation method, comprising: S1, collecting the target flow value, the current flow value, the current opening value of the inlet valve and the valve core operation time length data of the cooling tower water quantity regulation system in real time; S2, calculating the target opening value of the inlet valve and determining the opening regulation difference value according to the target flow value and the current flow value, in combination with the cooling tower heat dissipation demand, the circulating water temperature and the inlet valve characteristics; S3, monitoring the actual opening change curve of the inlet valve, judging whether the deviation between the actual opening and the target opening within the preset regulation time length exceeds the set deviation threshold, and if so, determining that the valve core is stuck; S4, after determining the sticking, first controlling the inlet valve to perform a reciprocating fine adjustment action at a set pulse frequency and amplitude to remove the scale on the surface of the valve core; S5, after completing the reciprocating fine adjustment, adjusting the inlet valve to the target opening again and monitoring the actual flow value: if it meets the standard, stopping; if it does not meet the standard and the deviation still exceeds the threshold, outputting an opening compensation signal; S6, continuously monitor the actual flow and outlet water temperature, if the outlet water temperature and the set heat dissipation temperature deviation threshold, trigger the warning prompt valve core deep cleaning.

[0006] In a second aspect, the application provides a power transmission channel risk early warning evaluation system, the system comprises a collection module, a calculation module, a judgment module, an execution module adjustment module, and a warning module, wherein: The collection module is used for real-time collection of the target flow value, the current flow value, the current opening value of the inlet valve and the valve core operation time length data of the cooling tower water quantity regulation system; The calculation module is used for calculating the target opening value of the inlet valve and determining the opening adjustment difference value according to the target flow value, the current flow value, the cooling tower heat dissipation demand, the circulating water temperature and the inlet valve characteristics; The judgment module is used for monitoring the actual opening change curve of the inlet valve, judging whether the deviation of the actual opening and the target opening within the preset adjustment time length exceeds the set deviation threshold, and determining that the valve core is stuck if it does; The execution module is used for controlling the inlet valve to perform reciprocating fine adjustment action at a set pulse frequency and amplitude after determining that the valve core is stuck, so as to remove the scale on the surface of the valve core; The adjustment module is used for adjusting the inlet valve to the target opening again and monitoring the actual flow value after completing the reciprocating fine adjustment, stopping if the actual flow value meets the standard, and outputting an opening compensation signal if the actual flow value does not meet the standard and the deviation still exceeds the threshold; The warning module is used for continuously monitoring the actual flow and outlet water temperature, and triggering a warning to prompt deep cleaning of the valve core if the outlet water temperature deviates from the set heat dissipation temperature by more than the threshold.

[0007] Compared with the prior art, the application has the following advantages: The application first accurately defines the water quantity fine adjustment scene to avoid frequent and large valve movements, thereby reducing valve core wear and laying a stable foundation for subsequent adjustment. If the valve core is slightly stuck, the stuck condition is determined in time to prevent forced adjustment from aggravating friction, and the surface scale is removed through reciprocating fine adjustment without stopping to restore the basic adjustment capability. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 The figure is a schematic diagram of the method framework structure of the application.

[0009] Figure 2A system framework structure diagram of the present application. DETAILED DESCRIPTION

[0010] The technical solutions of the present application will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0011] First aspect: please refer to Figure 1 The present application provides a cooling tower water quantity intelligent regulation method, comprising: S1, real-time acquisition of the target flow value, the current flow value, the current opening value of the water inlet valve and the valve core operation time length data of the cooling tower water quantity regulation system, wherein the water quantity fine adjustment scene is defined as the absolute value of the difference between the target flow and the current flow not exceeding a preset proportion of the current flow, specifically, when the current flow is in the normal operation range, if the absolute value of the difference between the two is small in proportion to the current flow, it indicates that the valve does not need to be adjusted greatly at this time, and only fine adjustment can meet the demand. The setting of the preset proportion can be adapted according to different operating conditions of the cooling tower (such as high load heat dissipation in summer and low load operation in winter), which can be realized by using the operating condition-proportion corresponding table stored in the control system, and the current water quantity fine adjustment scene can be quickly determined by calling the values in the corresponding table.

[0012] S2, according to the target flow value and the current flow value, combined with the cooling tower heat dissipation demand, the circulating water temperature and the water inlet valve characteristics, the target opening value of the water inlet valve is calculated and the opening adjustment difference is determined; in actual operation, the cooling tower heat dissipation demand will change with the change of the environment temperature, for example, the heat dissipation demand increases when the environment temperature is high in summer, at this time, more water quantity needs to pass through the cooling tower; if the circulating water temperature is higher than the set value, the water quantity also needs to be increased to improve the heat dissipation efficiency. The water inlet valve characteristics include the opening-flow curve of the valve, the flow output of different valves at the same opening exists difference, the target opening needs to be corrected combined with the curve when calculating. Specifically, the opening adjustment direction is preliminarily determined according to the difference between the target flow and the current flow, then combined with the flow correction coefficient corresponding to the heat dissipation demand, the opening compensation coefficient corresponding to the deviation between the circulating water temperature and the set temperature, and the opening correction value in the water inlet valve characteristic curve, the target opening value of the water inlet valve is calculated comprehensively, and the opening adjustment difference can be obtained by subtracting the current opening value from the target opening value.

[0013] For example, assuming that the basic opening of the cooling tower target flow is 50%, which can be found from the valve opening-flow curve. If it is summer at this time, the heat dissipation demand is high, the system will set the flow correction coefficient corresponding to summer as 1.1, which means that the basic opening needs to be enlarged by this coefficient to match the higher heat dissipation demand. First, calculate the opening degree after adjusting the heat dissipation requirement: 50% (basic opening degree) x 1.1 (summer flow correction coefficient) = 55%. Then, check the circulating water temperature, which is higher than the set value, and need to open an additional 10%. Add the two together: 55% (opening degree including correction coefficient) + 10% (water temperature adjustment) = 65%, which is the target opening degree of the water inlet valve. If the current opening degree is 40%, subtract 40% from 65% to get a regulation difference of 25% that needs to be opened.

[0014] S3, monitor the actual opening degree change curve of the water inlet valve, and determine whether the deviation between the actual opening degree and the target opening degree within the preset adjustment time is greater than the set deviation threshold (associated with the opening degree regulation difference), if it is, it is determined that the valve core is stuck; this step is to find out the problem of valve core sticking in time to avoid the problem of flow regulation not in place due to sticking. The preset adjustment time refers to the time required to adjust the water inlet valve from the current opening degree to the target opening degree in theory, which can be determined according to the maximum adjustment speed of the water inlet valve. The set deviation threshold is associated with the opening degree regulation difference, because the regulation difference is different, the allowed deviation range should also be different, the greater the regulation difference, the allowed deviation threshold can be appropriately relaxed, and vice versa. To determine it, you can establish a correspondence between the deviation threshold and the regulation difference by statistically analyzing the normal regulation deviation range under different opening degree regulation differences, for example, when the regulation difference is 5%, the set deviation threshold is 0.5%; when the regulation difference is 15%, the set deviation threshold is 1.2%. When calculating the threshold value of adjacent opening degree regulation difference interval, linear interpolation is used to obtain the intermediate value to ensure the accuracy of the judgment.

[0015] S4, after determining that the valve core is stuck, control the water inlet valve to perform reciprocating fine adjustment action at a set pulse frequency and amplitude to remove scale on the surface of the valve core; it should be understood that the valve core is often stuck due to scale adhering to the contact surface between the valve core and the valve seat, causing the valve core to be blocked. The set pulse frequency refers to the number of times the water inlet valve reciprocates per unit time, and the amplitude is the opening degree change of each reciprocating action. When executing, for example, set the pulse frequency to 2 times per second and the amplitude to 1% opening degree, the water inlet valve will perform 2 times of 1% opening degree increase-recovery of the original opening degree per second on the basis of the current opening degree. Through this slight mechanical vibration, the loose scale adhering to the surface of the valve core is removed, thereby eliminating the sticking.

[0016] S5, after completing the reciprocating fine adjustment, adjust the water inlet valve to the target opening degree again and monitor the actual flow value: if it meets the standard, stop; if it does not meet the standard and the deviation is still above the threshold, output an opening degree compensation signal; specifically, after the reciprocating fine adjustment of S4, most of the surface scale has been removed, at this time, the valve is adjusted again, if the actual flow reaches the target flow, it means that the jamming problem has been solved; if it still does not meet the standard, it may be that a small amount of stubborn scale remains on the valve core, causing the actual opening degree of the valve to deviate from the corresponding flow of the theoretical opening degree. The compensation amount is determined based on the flow deviation-opening degree compensation corresponding relationship trained by the historical jamming data of the cooling tower. Specifically, the deviation value of the actual flow from the target flow and the corresponding opening degree compensation amount under different jamming degrees in the past are collected, and the corresponding relationship model of the two is established by fitting and analyzing these data. For example, when the actual flow is 8% lower than the target flow, according to the model, it can be determined that an additional opening degree compensation amount of 3% is needed. By outputting this compensation signal, the water inlet valve is controlled to increase by 3% based on the current opening degree until the actual flow meets the standard.

[0017] S6, continuously monitor the actual flow and outlet water temperature, and if the deviation of the outlet water temperature from the set heat dissipation temperature is above the threshold, trigger a warning to clean the valve core. Specifically, normal actual flow can only indicate that the water quantity adjustment is in place, but the outlet water temperature is a key indicator of heat dissipation effect. When the outlet water temperature is higher than the set heat dissipation temperature and the deviation is above the threshold, it may be that a thick scale has formed inside the valve core, which cannot be completely removed by the reciprocating fine adjustment of S4. These scales will affect the long-term normal operation of the valve core, causing the flow regulation accuracy to gradually decrease, and thus affecting heat dissipation. At this time, an early warning is triggered to remind the staff to clean the valve core in depth, such as disassembling the valve, soaking the valve core with special cleaning agent to remove stubborn scale, and avoiding more serious failures caused by scale accumulation.

[0018] The present application first accurately defines the water quantity fine adjustment scene to avoid frequent and large movements of the valve to reduce valve core wear, laying a stable foundation for subsequent adjustment; when the circulating water needs to be increased in flow due to heating, the target opening degree is calculated in combination with the heat dissipation demand and the valve characteristics, ensuring that the adjustment direction matches the actual demand and providing an accurate target benchmark for subsequent jamming judgment. If the valve core appears to be slightly jammed, the jamming situation is determined in time to prevent forced adjustment from exacerbating friction, and the surface scale is removed by reciprocating fine adjustment without stopping to restore the basic adjustment capability; if the remaining scale still causes the flow to be out of standard, the opening degree is compensated based on historical data, without the need for manual trial adjustment to further correct the deviation; when the outlet water temperature is out of standard and the flow is normal, a deep cleaning warning is triggered to avoid focusing only on the flow and ignoring the accumulation of scale inside the valve core, extending from short-term adjustment to long-term failure prevention.

[0019] In some embodiments, in step S1: The current flow value is obtained at a preset acquisition frequency, and the acquisition data precision meets a preset precision standard; it should be noted that the preset acquisition frequency is achieved by setting a time interval according to the cooling tower flow fluctuation characteristics. The preset precision standard refers to the deviation of the acquired flow data from the actual flow, which needs to be controlled within a certain range, which can be achieved by selecting a high-precision flow sensor.

[0020] The current opening value of the water inlet valve is read in real time, and the feedback delay is controlled within a preset delay range; specifically, the preset delay range refers to the time difference from issuing the reading instruction to obtaining the opening value, which needs to meet the interval requirement, which can be achieved by optimizing the data transmission link and selecting a fast-response opening detection module, such as shortening the signal transmission distance between the sensor and the controller, reducing the signal transmission time, and ensuring that the system can calculate the adjustment amount based on the latest opening data when the valve needs to be adjusted quickly, avoiding flow fluctuations caused by adjustment lag.

[0021] A valve core operation time length statistical module is established, and the time length of each operation of the valve core is recorded from the start of the water inlet valve operation, forming a historical operation time length database, and the database automatically stores the historical operation time length data at a preset storage period. Specifically, the historical operation time length database refers to a data set for storing the time length of each operation of the valve core, which can be achieved by dividing a dedicated storage area in the control system, and recording the time length of each valve core from start to stop in time sequence, providing data support for subsequent analysis of valve core jam reasons and judgment of whether to maintain in advance. The preset storage period refers to the fixed period for the database to automatically save historical data, which can be set according to data usage requirements. Through the above-mentioned manner, the subsequent opening calculation and jam judgment can be more in line with the actual situation.

[0022] In some embodiments, step S2 comprises: Based on the cooling tower heat dissipation demand, combined with the environmental temperature, humidity and cooling load, the ideal circulating water flow required is calculated through the heat transfer formula, and the ideal circulating water flow is taken as the target flow value; it should be noted that the cooling load refers to the total heat that the cooling tower needs to take away from the circulating water in unit time, which is a core index reflecting the heat dissipation task intensity, and can be achieved by multiplying the system device power, operation time and heat conversion efficiency.

[0023] The enthalpy difference method heat transfer formula is a special formula for determining the ideal circulating water flow by calculating the enthalpy difference between air and circulating water combined with the cooling load, and the specific calculation logic is to divide the cooling load by the product of the specific heat capacity of water and the enthalpy difference between air and circulating water, to obtain the ideal circulating water flow. It can be achieved by presetting formula parameters in the control system and automatically calculating the input acquisition data, which will not be described in detail.

[0024] It should be understood that in actual operation, the enthalpy difference between air and circulating water decreases as the ambient temperature rises. If the cooling load remains unchanged, the ideal flow rate calculated by substituting the formula will increase. For example, in summer, the ambient temperature of the workshop rises sharply, and the cooling load increases sharply due to full-load operation of the equipment. The formula can calculate a larger ideal flow rate in time to avoid deviations in ideal flow rate calculation due to environmental changes and ensure that the preliminary target flow rate can cover the heat dissipation demand, laying a foundation for subsequent correction.

[0025] The inlet water temperature and outlet water temperature of the circulating water are collected, and the temperature difference value is calculated. If the temperature difference value is less than the preset heat dissipation temperature difference threshold, the target flow rate value is adjusted downward in proportion, and if the temperature difference value is greater than the preset heat dissipation temperature difference threshold, the target flow rate value is adjusted upward in proportion. It should be noted that the preset heat dissipation temperature difference threshold is achieved by setting a numerical range based on the cooling tower design heat dissipation efficiency and the system's maximum allowable outlet water temperature.

[0026] Specifically, in the rainy season, the air humidity is high, and the cooling tower heat dissipation efficiency decreases, and the circulating water temperature difference is easy to be less than the preset heat dissipation temperature difference threshold. At this time, it indicates that the current flow rate is too large, and the circulating water stays in the tower for a short time and is not fully cooled. Adjusting the target flow rate downward in proportion to the difference between the preset threshold and the actual temperature difference can prolong the water residence time in the tower, avoid water resource waste, and ensure the heat dissipation effect; if the temperature difference value is greater than the preset threshold, it indicates that the flow rate is insufficient, and the flow rate is adjusted upward in proportion, to cope with the changes in heat dissipation demand caused by working condition fluctuations.

[0027] The inlet water valve characteristic curve is retrieved, which contains the corresponding relationship between the inlet water valve opening and the flow rate. According to the current flow rate value and the adjusted target flow rate value, the corresponding inlet water valve opening is found on the characteristic curve as the current opening reference value and the target opening value, respectively. It should be noted that the inlet water valve characteristic curve is the corresponding relationship curve between the actual output flow rate and the opening of the same inlet water valve at different openings, which can be achieved by combining experimental collection and data fitting.

[0028] Specifically, different inlet water valves, even of the same type, will have differences in actual flow rate at the same opening due to manufacturing errors. Directly adjusting the opening in a fixed proportion may cause flow rate deviation. Therefore, during operation, the system retrieves the characteristic curve of the inlet water valve from the database, finds the corresponding vertical axis coordinates on the curve horizontal axis with the current flow rate value and the adjusted target flow rate value, respectively, as the current opening reference value and the target opening value. For example, the current flow rate corresponds to a certain opening of the curve, and the adjusted target flow rate corresponds to another opening. In this way, the flow rate and opening of each valve can be accurately matched, and the problem of different flow rates at the same opening can be avoided. The difference between the target opening degree value and the current opening degree reference value is calculated to obtain an opening degree adjustment difference. If the absolute value of the adjustment difference is less than a preset minimum adjustment threshold, it is determined that no adjustment is needed, and the current opening degree is maintained. It should be noted that the preset minimum adjustment threshold is the minimum valve opening degree adjustment amount that can have a perceptible effect on the circulating water flow. The value can be determined by testing the minimum adjustment accuracy of the inlet valve and the sensitivity of the flow to the opening degree.

[0029] Specifically, in winter, the cooling tower is in a low-load operation state, the circulating water flow fluctuates little, and the calculated opening degree adjustment difference is usually small. If the adjustment difference is very small, even if the adjustment is performed, the flow change is very small, which may increase the wear of the valve core. Therefore, the adjustment difference obtained by subtracting the current opening degree reference value from the target opening degree value is used to determine whether the adjustment is needed. If the absolute value of the difference is less than the preset minimum adjustment threshold, it is determined that no adjustment is needed, the current opening degree is maintained, the number of valve actions is reduced, the service life is prolonged, the flow is stabilized, and the heat dissipation fluctuation caused by frequent adjustment is avoided.

[0030] In some embodiments, step S3 includes: A preset adjustment duration is determined according to the maximum adjustment stroke of the inlet valve and the regular adjustment speed. Specifically, the preset adjustment duration is the longest reasonable time theoretically required for the inlet valve to adjust from the current opening degree to the target opening degree. The preset adjustment duration can be obtained by dividing the maximum adjustment stroke of the inlet valve by the regular adjustment speed. It should be understood that in actual application, if the maximum adjustment stroke of the inlet valve is large and the regular adjustment speed is fixed, the preset adjustment duration obtained by dividing the two will increase accordingly.

[0031] Within the preset adjustment duration, the actual opening degree value of the inlet valve is collected at a preset collection frequency, and an actual opening degree change curve is drawn. Specifically, the preset collection frequency can be set according to the valve adjustment speed and the sensitivity requirement for the stall determination.

[0032] Specifically, when the inlet valve executes the opening degree adjustment instruction, if the adjustment speed is fast, the system will shorten the preset collection frequency to collect the opening degree value at a high frequency. For example, in summer, the heat dissipation demand increases suddenly, and the valve needs to be quickly opened. High-frequency collection can record every change of the opening degree from the current value to the target value, and the drawn curve can clearly show whether the adjustment process is smooth. If the adjustment speed is slow, the collection frequency is appropriately reduced, which can reduce the data processing pressure of the system, ensure that the curve reflects the key change nodes, and avoid missing the stall precursor (such as sudden stagnation of the opening degree) due to too long collection interval.

[0033] A deviation threshold is set, which is determined according to the adjustment accuracy grade of the inlet valve. Different accuracy grades correspond to different deviation thresholds. The deviation threshold is the upper limit of the opening degree deviation for determining whether the valve core is stalled. It is a standard for distinguishing between normal adjustment deviation and abnormal deviation caused by stall. The value can be obtained by dividing the corresponding values according to the adjustment accuracy grade of the inlet valve.

[0034] At the end of the preset adjustment duration, the deviation of the actual opening value and the target opening value is calculated, and if the absolute value of the deviation exceeds the set deviation threshold, it is determined that the valve core is stuck; if the actual opening value does not change for a preset static duration during the adjustment process, it is also determined that the valve core is stuck.

[0035] Specifically, the preset static duration refers to the longest allowed time during which the actual opening value remains unchanged, which is a determination criterion for quickly identifying the completely stuck state of the valve, and is achieved by setting the time required for the minimum adjustment action of the water inlet valve. For example, the valve needs a certain time to complete a minimum amplitude adjustment, and if the actual opening value remains unchanged for more than this time, it indicates that the valve cannot operate normally, and it can be directly determined that the valve is stuck, thereby shortening the delay time of stuck identification.

[0036] It should be understood that if the preset adjustment duration ends and the absolute value of the deviation of the actual opening and the target opening exceeds the set deviation threshold, it indicates that the valve does not reach the target position as expected, and it is highly likely that the valve is stuck due to scale obstruction; if the actual opening value does not change for more than the preset static duration during the adjustment process, for example, if the valve is adjusted to a certain opening and does not change for more than the preset static duration, it can be directly determined that the valve is stuck even if the preset adjustment duration has not been reached. For example, in winter, the scale on the valve core is accumulated seriously, and the valve suddenly stops during adjustment. The system can quickly identify the stuck state and trigger subsequent cleaning actions by monitoring the static opening, thereby avoiding the delay of processing due to waiting for the end of the preset adjustment duration and reducing the impact of flow deviation on heat dissipation.

[0037] The present application realizes accurate and rapid identification of valve core sticking by scientifically setting determination parameters and dual-dimension determination logic. Reasonable preset adjustment duration avoids misjudgment, high-frequency acquisition ensures process traceability, graded deviation threshold adapts to different valve performances, and preset static duration shortens the delay of stuck identification.

[0038] In some embodiments, if the actual opening value does not change for a preset static duration during the adjustment process, it is also determined that the valve core is stuck, including: During the preset adjustment duration, the running current data of the water inlet valve and the circulating water pressure data of the cooling tower are synchronously collected, the running current data reflects the load state of the valve core driving mechanism, and the circulating water pressure data reflects the medium pressure difference before and after the valve core; it should be noted that the running current data can be collected by using a current sensor in series in the driving circuit.

[0039] The circulating water pressure data refers to the circulating water pressure difference between the front and rear ends of the water inlet valve, which can be collected by installing a pressure transmitter in the inlet and outlet pipelines of the valve.

[0040] It should be noted that when the water inlet valve executes the opening degree adjustment instruction, if the valve core starts to move, the driving mechanism load will fluctuate slightly with the change of the valve core position, and the operating current will also change accordingly; at the same time, the circulating water pressure will change at a certain rate due to the change of the valve core opening degree. For example, when the valve core is adjusted from 30% opening degree to 50% opening degree, the driving current first increases slightly due to the starting load, and then stabilizes in the rated range, and the circulating water pressure gradually decreases due to the increase of the flow area, and the change rate is maintained in the normal range. Synchronous acquisition of these two types of data provides a basis for subsequent jam reason determination.

[0041] If the actual opening degree value does not change for a preset static time during the adjustment process, the average value and fluctuation amplitude of the operating current in this period are calculated, and the change rate of the circulating water pressure is calculated; it should be noted that if the actual opening degree does not change for a preset static time, the two types of data are calculated. First, calculate the average value (add all current values collected in this period and divide by the number of collections) and the fluctuation amplitude (subtract the minimum value from the maximum value in this period) of the operating current; calculate the change rate of the circulating water pressure (subtract the starting pressure value from the ending pressure value in this period, and divide by the period length). For example, the valve core is adjusted to a certain opening degree and suddenly stops, the system collects 10 current values, adds them and divides by 10 to get the average value, and subtracts the minimum current from the maximum current to get the fluctuation amplitude; at the same time, the pressure change in 5 seconds is divided by 5 seconds to get the change rate, which is used to judge whether the threshold is exceeded.

[0042] If the average value of the operating current exceeds the preset current threshold and the fluctuation amplitude is less than the preset current fluctuation threshold, it is determined that the driving mechanism load is overloaded, causing jam, and the first type of early warning signal is triggered and the relevant data is recorded; it should be noted that the preset current threshold is set according to 1.2-1.5 times of the rated current of the driving mechanism.

[0043] It should be understood that in winter, the valve core is prone to increase the movement resistance due to the attachment of scale, and the driving mechanism needs to output more power to push the valve core, at this time the operating current will continuously exceed the preset current threshold, and because the resistance is stable, the current fluctuation amplitude becomes smaller. For example, after the scale of the valve core of a water inlet valve accumulates, the average value of the current during adjustment reaches 1.5 times of the rated value, and the fluctuation amplitude is only half of the normal case, the system determines that the driving mechanism load is overloaded, triggers the first type of early warning signal, and records the current current data and jam opening degree position, so that the maintenance personnel can check the driving parts and the cleaning state of the valve core.

[0044] If the circulating water pressure change rate is less than the preset pressure change threshold and the operating current is normal, it is determined that the valve core is stuck due to too small medium pressure difference, a second type of early warning signal is triggered, and the preset static time is adjusted by the difference value proportion of the pressure change rate and the preset reference value. It should be noted that the preset pressure change threshold can be achieved by setting the average value of the pressure difference change rate in the normal adjustment process, and the preset reference value is the pressure change rate in the design working condition, which is used to adjust the static time. It should be noted that when the cooling tower circulating water pump fails to cause the water supply pressure to drop, the medium pressure difference before and after the valve core becomes smaller, and even if the driving mechanism normally outputs power, the valve core cannot be moved. At this time, the operating current is maintained in the normal range, but the circulating water pressure change rate will be lower than the preset threshold. For example, the current fluctuates in the normal range for a period of time, and the pressure change rate is only half of the preset threshold. The system determines that the medium pressure difference is too small, triggers the second type of early warning signal, and at the same time prolongs the preset static time by the difference value proportion of the pressure change rate and the preset reference value. The smaller the pressure difference, the greater the extension range, which avoids misjudgment of sticking due to temporary pressure fluctuation and gives the system time to recover the pressure.

[0045] If the operating current and the circulating water pressure are normal and the actual opening degree is still stationary, it is determined that the valve core is mechanically stuck, a third type of early warning signal is triggered, and relevant parameter data is stored in a fault diagnosis sub-database. It should be noted that the fault diagnosis sub-database is a database specially storing valve core sticking related parameters and determination results, which can be achieved by dividing an independent storage area in the control system and storing data by time stamp.

[0046] It should be noted that after long-term use, the valve core may be mechanically stuck due to internal component wear and tear and foreign matter sticking. At this time, the driving mechanism load is not overloaded (the current is normal), and the medium pressure difference is sufficient (the pressure change rate is normal), but the valve core cannot move. For example, a water inlet valve is stuck due to internal gear wear and tear, the current and pressure data are in the normal range during adjustment, and the opening degree is constant. The system determines that the mechanical sticking is stuck, triggers the third type of early warning signal, and stores the sticking time, opening degree value, current and pressure data in the fault diagnosis sub-database to provide data support for later disassembly and maintenance.

[0047] According to the above determination result, the preset static time length of subsequent adjustment is dynamically adjusted, the preset static time length is shortened when load overload or mechanical jamming is triggered, and the preset static time length is lengthened when the medium pressure difference is too small. Specifically, if load overload or mechanical jamming is triggered, it means that the valve core has a clear fault risk, and the subsequent preset static time length needs to be shortened to discover the jamming again faster. For example, the original preset static time length is 5 seconds, which is shortened to 3 seconds. Once the opening degree is static again, the alarm can be triggered quickly to avoid expanding the fault. If the medium pressure difference is too small, it means that the jamming is caused by system pressure fluctuation. The preset static time length is lengthened (e.g. from 5 seconds to 8 seconds) to give the system pressure recovery time, reduce the misjudgment caused by temporary insufficient pressure, and balance the jamming recognition speed and accuracy.

[0048] In some embodiments, if the actual opening degree value does not change for a preset static time length during adjustment, it is also determined that the valve core is jammed, and further comprising: After the preset adjustment time length ends, the deviation of the actual opening degree value from the target opening degree value is calculated, and then an opening degree adjustment rate parameter is introduced. It should be noted that the opening degree adjustment rate parameter refers to the opening degree change amount per unit time of the valve core during adjustment, which can be realized by calculating the slope of the opening degree change curve. For example, at two consecutive collection time points, the opening degree value at the later time is subtracted from the opening degree value at the earlier time, and then divided by the time interval to obtain the rate value of the period. The average rate value of multiple periods is the overall adjustment rate. For example, if the target opening degree is 60%, the actual opening degree is 50% at the end of adjustment (deviation 10%), and the slope of the opening degree change curve is significantly smaller than normal (low rate), it means that the valve core not only does not reach the target, but also the adjustment process is slow, which may indicate a mild jamming. If the slope is normal and only the deviation is large, it may be that the target opening degree setting does not match the pressure. Introducing the rate parameter can distinguish between these two cases and avoid misjudging the direction as jamming.

[0049] If the deviation exceeds the set deviation threshold and the opening degree adjustment rate is less than the preset rate threshold, multi-parameter collaborative verification is entered, the product of the deviation value and the rate value is calculated to obtain a collaborative coefficient, and a correlation model is established in combination with the maximum running current collected in the early stage. The preset rate threshold can be set by combining the design adjustment speed of the inlet valve with the actual running experience.

[0050] The correlation model refers to a mathematical model that establishes the relationship between the collaborative coefficient and the maximum running current collected in the early stage. The corresponding relationship between the collaborative coefficient and the maximum current in the historical data can be fitted into a curve.

[0051] It should be understood that when the deviation is 10% and the rate is only 60% of the preset threshold, the synergy coefficient = 10% x (preset rate threshold - 60% preset rate threshold) = 10% x 40% preset rate threshold, the value increases as the rate decreases. At the same time, the maximum value of the operating current in the adjustment process is called, if the current does not exceed the upper limit, it means that the load is not overloaded, and the jam may be caused by slight water scale; if the current exceeds the upper limit, it means that the load is large, and the jam degree is more serious, and the correlation model can quantify this relationship to provide a basis for subsequent determination.

[0052] If the synergy coefficient exceeds the preset synergy threshold and the operating current does not exceed the upper limit, it is determined that the valve core is slightly jammed, and the preset window time is not directly triggered by the jam determination, but the opening degree monitoring and deviation calculation are re-executed according to the amplitude calculated by the correlation model; wherein the preset synergy threshold is achieved by setting the distribution range of the synergy coefficient in the historical jam data.

[0053] Among them, the preset window time refers to the monitoring time extended for slight jam, which can be achieved by dynamically setting the amplitude calculated by the correlation model.

[0054] For example, in summer, the impurities in the circulating water increase, and the valve core may be adjusted slowly due to slight adhesion. At this time, the deviation exceeds the threshold, the rate is low, but the current is normal (not overloaded). The system prolongs the preset window time according to the correlation model, continues to monitor the opening degree, and if the valve core gradually reaches the target opening degree within the extended time, it means that it is temporary delay and does not need to trigger jam; if it still does not meet the standard, it will be upgraded to avoid false judgment of jam due to slight resistance, which leads to frequent shutdown.

[0055] If the synergy coefficient exceeds the preset synergy threshold and the operating current exceeds the upper limit, it is determined that the valve core is moderately jammed, and the pulse frequency initial value of step S4 is adjusted according to the current over-limit proportion when the jam determination is triggered; it should be noted that the synergy coefficient is a comprehensive index calculated by the product of the deviation value and the rate value, which is essentially a parameter that amplifies the jam feature by integrating static deviation and dynamic delay information. The calculation method can be achieved.

[0056] Further, the valve core causes the adjustment resistance to increase due to thick water scale, not only the deviation is large and the rate is slow, but also the driving current exceeds the upper limit, which means that the jam degree is moderate. The system triggers the jam determination at the same time, and increases the pulse frequency initial value of step S4 according to the current over-limit proportion, so that the subsequent water scale cleaning pulse impact is stronger, and the serious jam problem is solved.

[0057] ​If the deviation exceeds the threshold value but the opening adjustment rate is normal, the ratio of the deviation value to the average value of the circulating water pressure is calculated. If the ratio exceeds the preset pressure deviation ratio threshold value, it is determined that the false jamming is caused by the deviation of the adjustment direction, the jamming determination is not triggered, and the target opening value is corrected according to the ratio difference and then re-adjusted. It should be noted that the pressure deviation ratio threshold value can be achieved by setting the normal corresponding relationship between the circulating water pressure and the opening.

[0058] Further, if the operator mistakenly sets a large opening valve as a small closing target opening, it will cause a large deviation between the actual opening and the target value, but the valve core adjustment rate is normal (fast action according to the error instruction), and the circulating water pressure changes due to the error of the opening. The ratio of the deviation to the average value of the pressure will exceed the threshold value. The system determines that it is a false jamming, does not trigger an alarm, and re-adjusts the target opening according to the ratio difference, thereby avoiding invalid jamming processing caused by human setting errors.

[0059] According to the above determination result, the preset adjustment time and the set deviation threshold value are dynamically adjusted. If the mild jamming is triggered continuously for multiple times, the preset adjustment time is extended and the deviation threshold value is reduced. If the moderate jamming is triggered, the preset adjustment time is shortened and the deviation threshold value is increased.

[0060] It should be understood that if the mild jamming is triggered continuously for multiple times, it indicates that the valve core may gradually accumulate scale and the dynamic response becomes slow, so the preset adjustment time needs to be extended and the deviation threshold value needs to be reduced to give the valve core more adjustment time and improve the determination sensitivity. If the moderate jamming is triggered, it indicates that the jamming risk is rising, so the preset adjustment time is shortened and the deviation threshold value is increased to speed up the jamming identification speed, while allowing a slightly larger deviation to avoid excessive sensitivity, thereby balancing the identification efficiency and accuracy.

[0061] In some embodiments, in step S4, the following steps are included: According to the model and material of the valve core, the pulse frequency is set, different materials of the valve core correspond to different pulse frequencies; The amplitude of the reciprocating fine adjustment action is set, the amplitude value is determined according to a preset proportion of the target opening value, and the maximum stroke of a single fine adjustment does not exceed a preset upper limit of the stroke; The water inlet valve performs the reciprocating fine adjustment action according to the set pulse frequency and amplitude on the basis of the current opening value, the action duration is determined according to the running time of the valve core, and different running time intervals correspond to different durations; During the reciprocating fine adjustment, the running noise of the water inlet valve is monitored in real time. If the noise value exceeds a preset noise threshold value, the pulse amplitude is reduced by a preset proportion. The reciprocating fine adjustment refers to the small-amplitude and high-frequency reciprocating motion of the water inlet valve near the current opening value.

[0062] Specifically, the pulse frequency refers to the number of actions per unit time of the reciprocating fine adjustment of the water inlet valve, which can be achieved by setting according to the model and material of the valve core.

[0063] The reciprocating fine-tuning amplitude is a single opening degree change amount, which can be calculated according to a preset proportion of the target opening degree value and is not greater than a preset stroke upper limit. For example, if the target opening degree is large, the amplitude calculated according to the proportion is slightly large, and if the upper limit is exceeded, the upper limit is executed.

[0064] The duration is the total fine-tuning time, which can be achieved by setting the valve core operation time interval.

[0065] For example, the operating noise is monitored in real time during the reciprocating fine-tuning, the preset noise threshold is the noise upper limit for avoiding damage to the valve, and if the noise exceeds the threshold, the pulse amplitude is reduced according to a preset proportion to prevent damage to the valve components.

[0066] In some embodiments, step S5 includes: After completing the reciprocating fine-tuning action, the water inlet valve is adjusted to the target opening degree value at an original opening degree adjustment difference, and the adjustment speed is reduced according to a preset proportion compared to the first adjustment. The original opening degree adjustment difference refers to the difference between the target opening degree value and the current opening degree reference value before the reciprocating fine-tuning, which can be achieved by calculating the target opening degree value minus the current opening degree reference value. It should be understood that there may still be slight resistance in the valve core after the reciprocating fine-tuning, and the reduced speed adjustment can reduce the driving load and avoid causing jamming again due to excessive speed. For example, the first adjustment speed is a certain value, and after the reduction, the speed is more stable, and even if there is residual resistance in the valve core, it can be slowly overcome to ensure stable approach to the target opening degree. After the adjustment is completed, the system is operated stably for a preset stable duration, and then the actual flow value is collected to calculate the deviation between the actual flow value and the target flow value. Specifically, the preset stable duration refers to the waiting time for stabilizing the circulating water flow after the adjustment is completed, which can be achieved by setting according to the pipe length of the circulating water system and the water flow inertia.

[0067] For example, immediately after the adjustment is completed, the circulating water flow may have a transient fluctuation due to the water flow inertia in the pipe. For example, the flow may be temporarily high or low after the valve is opened to the target opening degree. After waiting for a preset stable duration, the water flow stabilizes, and the flow data collected at this time more accurately reflects the actual state, avoiding misjudgment of whether the flow meets the standard due to the transient value.

[0068] If the absolute value of the deviation is less than or equal to the preset flow deviation allowed value, it is determined that the flow meets the standard, and the adjustment is stopped. Specifically, the preset flow deviation allowed value is the maximum allowed difference for determining whether the actual flow meets the standard, which can be achieved by setting according to the flow sensitivity of the cooling tower heat dissipation requirement.

[0069] Further, if the deviation between the actual flow after stabilization and the target value is within the allowed range, it indicates that the fine-tuning and the reduced speed adjustment have solved the jamming problem, and the flow can meet the heat dissipation requirement. For example, if the cooling tower is used for cooling ordinary equipment, a slightly large flow deviation is allowed, and at this time, the determination of meeting the standard can reduce unnecessary further adjustment and save energy consumption.

[0070] If the absolute value of the deviation is greater than the flow deviation allowable value, and the deviation between the actual opening and the target opening still exceeds the set deviation threshold at this time, an opening compensation signal is output, the compensation signal includes a compensation opening value, the compensation opening value is calculated according to the flow deviation and the water inlet valve characteristic curve, and the compensation amplitude is determined according to a preset proportion of the original adjustment difference. It should be noted that the opening compensation signal is a command for correcting the opening to eliminate the flow deviation, which can be realized in the form of an electric signal containing the compensation opening value and the adjustment direction, and is transmitted to the water inlet valve actuator through the control system to guide further adjustment. The compensation opening value is the opening amount that needs to be adjusted additionally to eliminate the flow deviation, which is realized by reverse calculation according to the flow deviation and the water inlet valve characteristic curve.

[0071] Further, if the flow deviation is still large after stabilization, and there is still a gap between the actual opening and the target opening, it indicates that the simple adjustment has not completely eliminated the jamming effect. The system reversely calculates the compensation opening value that needs to be adjusted additionally according to the flow deviation and the water inlet valve characteristic curve, for example, the original adjustment difference is 20%, and the compensation amplitude determined according to a preset proportion is not more than 5%, which ensures effective elimination of deviation and avoids excessive adjustment leading to new instability, and finally makes the flow accurately match the target value.

[0072] In some embodiments, in step S6, the following steps are included: The actual flow value and the cooling tower outlet water temperature value are continuously collected at a preset collection frequency, and a heat dissipation temperature is set, which is set according to cooling demand and can be dynamically adjusted according to environmental changes; An outlet water temperature deviation threshold is set, which is determined according to the cooling process requirement; It should be noted that the set heat dissipation temperature refers to the target outlet water temperature that the cooling tower needs to reach, which is realized by dynamically adjusting according to the allowable maximum temperature of the cooled equipment and the environmental temperature.

[0073] The outlet water temperature deviation threshold refers to the maximum difference between the actual outlet water temperature and the set heat dissipation temperature, which is realized by setting the accuracy requirement of the cooling process.

[0074] It should be understood that if the cooled workshop equipment is switched from half load to full load, the cooling demand increases, and the set heat dissipation temperature will be adjusted downward accordingly; if the environmental temperature rises sharply in the afternoon, even if the equipment load does not change, the temperature will also be adjusted appropriately to offset the environmental impact. The simultaneously collected flow and temperature data can reflect whether the flow meets the standard and whether the heat dissipation is effective in real time, providing basic data for subsequent judgment, for example, if the flow data is normal, it indicates that the opening adjustment is not a problem, and if the temperature is still deviated, it is probably caused by fouling.

[0075] The deviation of the water temperature from the set heat dissipation temperature is calculated in real time. If the absolute value of the deviation continuously exceeds the set deviation threshold for a preset deviation duration, and the actual flow value is within a preset flow fluctuation range of the target flow value, it is determined that the valve core is scaled and affects the heat dissipation efficiency. The preset deviation duration refers to the shortest time that needs to be continuously observed after the actual water temperature deviation exceeds the threshold, and is achieved by setting according to the temperature response speed of the circulating water system.

[0076] The preset flow fluctuation range refers to an acceptable interval of the actual flow value fluctuating around the target flow value, and is achieved by setting according to the flow sensitivity of the cooling tower heat dissipation requirement.

[0077] Further, if the cooling tower is used to cool electronic components, the electronic components are sensitive to temperature, the process requires a small temperature fluctuation range, and the water temperature deviation threshold is set to be small. If it is used to cool ordinary mechanical equipment, the process requirement is relatively loose, and the threshold can be appropriately enlarged.

[0078] Further, in winter, the valve core is easy to accumulate scale. If the actual water temperature continuously exceeds the set heat dissipation temperature, and the deviation state maintains for more than the preset deviation duration, the actual flow needs to be checked first. If the flow is within the preset fluctuation range, it means that the opening degree is up to standard, and the water flow should be able to meet the heat dissipation, so the possibility of poor heat dissipation caused by insufficient flow is excluded, and it is determined that the valve core is scaled. The scale adheres to the surface of the valve core, reducing the water flow passage. Even if the opening degree is large, the actual water flow speed will also slow down, and the heat dissipation efficiency will decrease. For example, if the actual flow of a cooling tower fluctuates around the target value, but the water temperature continuously exceeds the threshold and the duration is up to standard, the system can accurately determine that the scale is formed, so as to avoid confusing the flow problem with the scale problem.

[0079] The pre-warning prompt is triggered, and the pre-warning mode includes a preset sound and light alarm and a remote terminal push prompt information. It should be noted that the historical fault database refers to a data set specially storing valve core scaling pre-warning and other fault information, which can be recorded and stored in the control system locally or in the cloud in the format of “pre-warning time-valve core running time-temperature / flow data”, so as to facilitate later tracing of the scaling frequency under different running time and making more accurate maintenance plan.

[0080] For example, after it is determined that the valve core is scaled, the sound and light alarm of the cooling tower site is started to remind the nearby workers to pay attention. At the same time, the remote terminal (such as the mobile phone APP of the management personnel, the workshop monitoring system) will receive the push prompt, and the content includes the recommended cleaning time and cleaning process. The synchronously recorded data can help later analysis: for example, a valve core frequently triggers the scaling pre-warning after running for the same length of time, which can shorten its maintenance period, so that the maintenance is more forward-looking, and the long-time heat dissipation failure caused by scaling is avoided.

[0081] The embodiment breaks through the limitation of judging faults only by opening or flow, accurately identifies the implicit heat dissipation problem caused by valve core fouling through the cooperative characteristics of normal flow but temperature deviation, and ensures that the cooling tower continuously meets the heat dissipation demand, prolongs the service life of the valve core, and reduces the risk of production interruption caused by sudden failure through dynamic early warning and data recording.

[0082] Referring to Figure 2 In a second aspect, the application further provides a power transmission channel risk early warning evaluation system, which comprises a collection module, a calculation module, a judgment module, an execution module, an adjustment module, and an early warning module, wherein: The collection module is used for collecting the target flow value, the current flow value, the current opening value of the inlet valve, and the valve core operation time length data of the cooling tower water quantity regulation system in real time; The calculation module is used for calculating the target opening value of the inlet valve according to the target flow value and the current flow value, in combination with the cooling tower heat dissipation demand, the circulating water temperature, and the inlet valve characteristics, and determining the opening adjustment difference value; The judgment module is used for monitoring the actual opening change curve of the inlet valve, judging whether the deviation of the actual opening from the target opening within the preset adjustment time length exceeds the set deviation threshold value, and determining that the valve core is stuck if the deviation exceeds the set deviation threshold value; The execution module is used for controlling the inlet valve to perform reciprocating fine adjustment actions at a set pulse frequency and amplitude to remove the water scale on the surface of the valve core after determining that the valve core is stuck; The adjustment module is used for adjusting the inlet valve to the target opening again and monitoring the actual flow value after completing the reciprocating fine adjustment; if the actual flow value meets the standard, the adjustment is stopped; if the actual flow value does not meet the standard and the deviation still exceeds the threshold value, an opening compensation signal is output; The early warning module is used for continuously monitoring the actual flow and the outlet water temperature; if the deviation of the outlet water temperature from the set heat dissipation temperature exceeds the threshold value, an early warning prompt for deep cleaning of the valve core is triggered.

[0083] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A method for intelligent regulation of cooling tower water quantity, characterized in that, Comprise: S1, real-time acquisition of cooling tower water quantity regulation system target flow value, current flow value, current opening value of inlet valve and valve core operation time data; S2, according to the target flow value, the current flow value, combined with the cooling tower heat dissipation demand, circulating water temperature and inlet valve characteristics, calculate the target opening value of inlet valve and determine the opening adjustment difference value; S3, monitor the actual opening change curve of inlet valve, judge whether the deviation of actual opening and target opening in preset adjustment time is more than the set deviation threshold, if more, determine that the valve core is stuck; S4, after determining the sticking, first control the inlet valve to execute reciprocating fine tuning action with set pulse frequency and amplitude, and remove the scale on the surface of valve core; S5, after completing the reciprocating fine tuning, adjust the inlet valve to the target opening again and monitor the actual flow value: if it meets the standard, stop, if it does not meet the standard and the deviation is still more than the threshold, output the opening compensation signal; S6, continuously monitor the actual flow and outlet water temperature, if the deviation of outlet water temperature and set heat dissipation temperature is more than the threshold, trigger the early warning prompt for deep cleaning of valve core.

2. The method of claim 1, wherein, In step S1: Get the current flow value according to the preset collection frequency, and the collection data accuracy meets the preset accuracy standard; Real-time read the current opening value of inlet valve, and the feedback delay is controlled within the preset delay range; Start timing from the start of inlet valve operation, and record the time of each operation of valve core, form a historical operation time database, and the database automatically stores the historical operation time data according to the preset storage period.

3. The method of claim 1, wherein, Step S2 includes: Based on the cooling tower heat dissipation demand, combined with the environment temperature, humidity and cooling load, calculate the ideal circulating water flow required by heat transfer formula, and take the ideal circulating water flow as the target flow value; Collect the inlet water temperature and outlet water temperature of circulating water, calculate the temperature difference value, if the temperature difference value is less than the preset heat dissipation temperature difference threshold, reduce the target flow value by a certain proportion, if the temperature difference value is greater than the preset heat dissipation temperature difference threshold, increase the target flow value by a certain proportion; Call the inlet valve characteristic curve, which contains the corresponding relationship between the inlet valve opening and the flow, find the corresponding inlet valve opening on the characteristic curve according to the current flow value and the adjusted target flow value, respectively as the current opening reference value and the target opening value; Calculate the difference value of target opening value and current opening reference value, get the opening adjustment difference value, if the absolute value of adjustment difference value is less than the preset minimum adjustment threshold, it is determined that there is no need to adjust, and the current opening is maintained.

4. The method of claim 1, wherein, In step S3, it includes: Preset adjustment time, which is determined according to the maximum adjustment stroke and the conventional adjustment speed of inlet valve; In the preset adjustment time, collect the actual opening value of inlet valve according to the preset collection frequency, and draw the actual opening change curve; Set the deviation threshold, which is determined according to the adjustment accuracy level of inlet valve, different accuracy levels correspond to different deviation thresholds; At the end of the preset adjustment time, calculate the deviation of actual opening value and target opening value, if the absolute value of deviation exceeds the set deviation threshold, it is determined that the valve core is stuck; if the actual opening value does not change for a preset static time during the adjustment process, it is also determined that the valve core is stuck.

5. The method of claim 4, wherein, If the actual opening value does not change for a preset static time during the adjustment process, it is also determined that the valve core is stuck, including: In a preset adjustment duration, the running current data of the water inlet valve and the circulating water pressure data of the cooling tower are synchronously collected, the running current data reflects the load state of the valve core driving mechanism, and the circulating water pressure data reflects the medium pressure difference before and after the valve core; If the actual opening value does not change for a preset static duration during the adjustment process, the current and pressure cooperative verification link is entered, the average value and fluctuation amplitude of the running current in the period are calculated, and the change rate of the circulating water pressure is calculated; If the average value of the running current exceeds the preset current threshold value and the fluctuation amplitude is less than the preset current fluctuation threshold value, it is determined that the driving mechanism load overload causes the jam, a first type of early warning signal is triggered, and relevant data is recorded; If the change rate of the circulating water pressure is less than the preset pressure change threshold value and the running current is normal, it is determined that the small medium pressure difference causes the valve core to be stuck, a second type of early warning signal is triggered, and the preset static duration is adjusted by the difference value proportion of the pressure change rate and the preset reference value; If the running current and the circulating water pressure are normal and the actual opening continues to be static, it is determined that the valve core is mechanically jammed, a third type of early warning signal is triggered, and relevant parameter data is stored in a fault diagnosis sub-database; According to the above judgment result, the preset static duration of subsequent adjustment is dynamically adjusted, the preset static duration is shortened if load overload or mechanical jamming is triggered, and the preset static duration is lengthened if the medium pressure difference is too small.

6. The cooling tower water flow intelligent regulation method of claim 4, wherein: If the actual opening value does not change for a preset static duration during the adjustment process, it is also determined that the valve core is jammed, and further comprising: After the preset adjustment duration ends, the deviation of the actual opening value and the target opening value is calculated, and then the opening adjustment rate parameter is introduced; If the deviation exceeds the set deviation threshold value and the opening adjustment rate is less than the preset rate threshold value, the multi-parameter cooperative verification is entered, the product of the deviation value and the rate value is obtained to obtain the cooperative coefficient, and the correlation model is established in combination with the maximum value of the running current collected in the early stage; If the cooperative coefficient exceeds the preset cooperative threshold value and the running current does not exceed the upper limit, it is determined that the valve core is slightly jammed, the jamming determination is not directly triggered, but the preset window duration is lengthened according to the amplitude calculated by the correlation model, and the opening monitoring and deviation calculation are re-executed; If the cooperative coefficient exceeds the preset cooperative threshold value and the running current exceeds the upper limit, it is determined that the valve core is moderately jammed, the jamming determination is triggered at the same time, and the pulse frequency initial value of the subsequent step S4 is adjusted according to the current over-limit proportion; If the deviation exceeds the threshold value but the opening adjustment rate is normal, the ratio of the deviation value and the average value of the circulating water pressure is calculated, if the ratio exceeds the preset pressure deviation ratio threshold value, it is determined that the adjustment direction deviation causes false jamming, the jamming determination is not triggered, and the target opening value is corrected according to the ratio difference and then re-adjusted; According to the above judgment result, the preset adjustment duration and the set deviation threshold value are dynamically adjusted, the preset adjustment duration is lengthened and the deviation threshold value is reduced if the slight jamming is triggered for a plurality of times in succession, and the preset adjustment duration is shortened and the deviation threshold value is increased if the moderate jamming is triggered.

7. The method of claim 1, wherein the method further comprises: In step S4, comprising: According to the model and material of the valve core, the pulse frequency is set, different material valve cores correspond to different pulse frequencies; The amplitude of the reciprocating fine adjustment action is set, the amplitude value is determined according to the preset proportion of the target opening value, and the maximum stroke of single fine adjustment does not exceed the preset stroke upper limit; The control water inlet valve is based on the current opening value, and performs reciprocating fine adjustment action according to the set pulse frequency and amplitude, and the action duration is determined according to the valve core running time, and different running time intervals correspond to different duration; During the reciprocating fine adjustment process, the running noise of the water inlet valve is monitored in real time, and if the noise value exceeds the preset noise threshold, the pulse amplitude is reduced by a preset proportion.

8. The method of claim 1, wherein, In step S5, comprising: After completing the reciprocating fine adjustment action, the water inlet valve is adjusted to the target opening value according to the original opening adjustment difference, and the adjustment speed is reduced by a preset proportion compared with the first adjustment; After the adjustment is completed, the actual flow value is collected again, and the deviation between the actual flow value and the target flow value is calculated; If the absolute value of the deviation is less than or equal to the preset flow deviation allowed value, it is determined that the flow meets the standard, and the adjustment is stopped; If the absolute value of the deviation is greater than the flow deviation allowed value, and the deviation between the actual opening and the target opening still exceeds the set deviation threshold at this time, an opening compensation signal is output, the compensation signal contains a compensation opening value, the compensation opening value is calculated according to the flow deviation and the water inlet valve characteristic curve, and the compensation amplitude is determined according to the preset proportion of the original adjustment difference.

9. The method of claim 1, wherein, In step S6, comprising: The actual flow value and the cooling tower outlet water temperature value are continuously collected at a preset collection frequency, and the heat dissipation temperature is set, which is set according to the cooling demand and can be dynamically adjusted according to the environment change; The outlet water temperature deviation threshold is set, which is determined according to the cooling process requirement; The deviation between the outlet water temperature and the set heat dissipation temperature is calculated in real time, if the absolute value of the deviation exceeds the set deviation threshold for a continuous preset deviation duration, and the actual flow value is within the preset flow fluctuation range of the target flow value at this time, it is determined that the valve core is affected by the scale affecting the heat dissipation efficiency; Trigger the early warning prompt, the early warning mode includes the preset sound and light alarm and the remote terminal push prompt information.

10. A power transmission channel risk early warning assessment system suitable for the cooling tower water quantity intelligent adjustment method of any one of claims 1 to 9, characterized in that, The system comprises an acquisition module, a calculation module, a judgment module, an execution module, an adjustment module and a warning module, wherein: The acquisition module is used for real-time acquisition of the target flow value, the current flow value, the current opening value of the water inlet valve and the valve core running time data of the cooling tower water quantity regulation system; The calculation module is used for calculating the target opening value of the water inlet valve according to the target flow value and the current flow value, combining the cooling tower heat dissipation demand, the circulating water temperature and the water inlet valve characteristics; The judgment module is used for monitoring the actual opening change curve of the water inlet valve, judging whether the deviation between the actual opening and the target opening exceeds the set deviation threshold within the preset adjustment time, and determining the valve core jam if it does; The execution module is used for controlling the water inlet valve to perform reciprocating fine adjustment action at a set pulse frequency and amplitude after determining the jam, and removing the scale on the surface of the valve core; The adjustment module is used for adjusting the water inlet valve to the target opening again and monitoring the actual flow value after completing the reciprocating fine adjustment, stopping if it meets the standard, and outputting an opening compensation signal if it does not meet the standard and the deviation still exceeds the threshold; The warning module is used for continuously monitoring the actual flow and the outlet water temperature, and triggering the early warning prompt for deep cleaning of the valve core if the deviation between the outlet water temperature and the set heat dissipation temperature exceeds the threshold.

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