Automatic water distribution device and method for bottom water collection tank of radiator of SCAL type indirect cooling system

Abstract

The invention belongs to the technical field of chemical corrosion prevention, and relates to an automatic water distribution device and method for a bottom water collection tank of a radiator of an SCAL type indirect cooling system. Comprising a detection control system and a mechanical unit system. The detection control system comprises a control device, an electromagnetic regulating valve and a flow meter; the mechanical unit system comprises a carbon steel water feeding pipe, an intercooling water distributor, an aluminum pipe to carbon steel pipe joint and a water feeding aluminum pipe; the water outlet end of the carbon steel water inlet pipe is sequentially connected with a flow meter and an electromagnetic regulating valve and then is communicated with a water inlet of an intercooling water distributor; a plurality of water outlets of the indirect cooling water distributor are correspondingly connected with a plurality of water feeding aluminum pipes through aluminum pipe carbon conversion steel pipe joints; the signal output end of the flow meter is connected with the control device; and the control output end of the control device is connected with the electromagnetic regulating valve. According to the invention, the consistency of the flow rate and the flow velocity of water flow finally entering each water feeding aluminum pipe is ensured, so that the problems of non-uniform hydraulic distribution and local high-speed washing caused by a water inlet mode of a traditional water collecting tank are effectively solved.

Description

Technical Field

[0001] This invention belongs to the field of chemical corrosion protection technology, and relates to an automatic water distribution device and method for the bottom water collection tank of a SCAL type indirect cooling system radiator. Background Technology

[0002] The SCAL type indirect cooling system is a mainstream radiator configuration used in newly built thermal power units. The radiators of this unit are made of 1050A pure aluminum. During operation, circulating water flows through 1mm thick aluminum tubes, which are wrapped with aluminum fins. Air cools the circulating water. Corrosion at the ends of the radiator aluminum tubes has been a persistent problem for this type of indirect cooling system during operation.

[0003] The SCAL type indirect air-cooled system uses a surface condenser, with the radiators arranged vertically. During system operation, circulating water enters the surface condenser and undergoes surface heat exchange. The heated circulating water is then pumped to the indirect cooling tower, where it exchanges surface heat with the air through the air-cooled radiators. After cooling, it returns to the condenser to cool the turbine exhaust steam, forming a closed loop. Figures 1-3 As shown, the air-cooled radiator in the system consists of a bottom water collection tank 102, an aluminum tube bundle 105, and a top water collection tank 101, all made of 1050A pure aluminum. The aluminum tube bundle 105, from left to right, includes aluminum tube 1051, aluminum tube 2, ..., aluminum tube 1059, ..., aluminum tube 10515, ..., aluminum tube 10519, ..., aluminum tube 10522, aluminum tube 10524, ..., aluminum tube 10540. Furthermore, the aluminum tube bundle 105 has four rows, with two rows of aluminum tubes flowing upwards (referred to as upper water tubes in this invention) and two rows flowing downwards (referred to as lower water tubes in this invention). Each row contains 40 aluminum tubes.

[0004] The bottom water collection tank 102 has a hot water inlet 103 (inlet side) and a cold water inlet 104 (outlet side), separated by a partition. The function of the inlet side of the bottom water collection tank 102 is to distribute the circulating water from the pipeline to the two rows of upper aluminum pipes in the aluminum pipe bundle 105. After the circulating water is cooled, it flows back down through the top water collection tank 101 and continues to be cooled through the two rows of lower aluminum pipes. The water in the lower aluminum pipes is then collected at the outlet side of the bottom water collection tank 102 and flows into the circulating water pipeline, completing the entire heat dissipation and cooling process. Half of the hot water inlet 103 of the bottom water collection tank 102 is blocked by a baffle. Part of the water flow is changed due to the baffle. The water flows into the inlet side of the water collection tank along the diameter change above the inlet. The extension line of the diameter change is at an angle of about 45° to the position of aluminum pipes No. 9, No. 1059, No. 16, No. 17, and No. 18 and the outlet of the inlet pipe. A rubber sealing ring separates the water collection tank and the aluminum pipe to prevent them from coming into direct contact. A reinforcing strip on the outside of the lower water collection tank then presses all three together to create a seal. If corrosion occurs at the aluminum pipe opening, and the damage extends beyond the sealing ring, circulating water will leak out.

[0005] Existing research results indicate that varying degrees of corrosion are present at the inlets of aluminum radiator tubes in multiple power plants. The corrosion morphology exhibits valley, teardrop, and horseshoe shapes, characteristic of typical erosion corrosion. For example... Figure 3 As shown, the aluminum pipes exhibiting pipe joint corrosion are all located near the inlet of the bottom water collection tank. The corrosion at the pipe joints of pipes #17 and #18 is more severe than at other locations, while the pipe joints farther from the inlet show no obvious corrosion. This indicates that pipe joint corrosion in radiators occurs in areas where the water flow direction changes significantly or in areas where the flow direction changes dramatically, showing a significant correlation with the circulating water flow direction. Summary of the Invention

[0006] To address the problem in existing SCAL-type indirect cooling systems where the water flow distribution from the bottom water tank to the upper aluminum pipe is a direct connection, leading to erosion corrosion at points where the water flow direction changes significantly, this invention provides an automatic water distribution device and method for the bottom water tank of the SCAL-type indirect cooling system. This automatic water distribution device and related control system uniformly distribute the water volume and flow direction from the bottom water tank to the upper aluminum pipe, minimizing erosion corrosion, extending equipment lifespan, and ensuring safe unit operation.

[0007] To achieve the above objectives, the present invention employs the following technical solution: In a first aspect, the present invention provides an automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator, comprising a detection and control system and a mechanical unit system; the detection and control system includes a control device, an electromagnetic regulating valve and a flow meter; the mechanical unit system includes a carbon steel inlet pipe, an indirect cooling water distributor, an aluminum pipe to carbon steel pipe joint and an aluminum inlet pipe. The outlet of the carbon steel water pipe is connected in sequence to the flow meter and the electromagnetic regulating valve, and then connected to the inlet of the intercooled water distributor; the multiple outlets of the intercooled water distributor are connected to multiple aluminum water supply pipes through the aluminum pipe to carbon steel pipe joint. The signal output terminal of the flow meter is connected to the signal input terminal of the control device; the control output terminal of the control device is connected to the control terminal of the electromagnetic regulating valve.

[0008] Preferably, the flow meter is a time-difference ultrasonic flow meter.

[0009] Preferably, both upstream and downstream of the flow meter have straight pipe sections that meet the flow meter's measurement accuracy requirements.

[0010] Preferably, the aluminum pipe to carbon steel pipe joint includes an aluminum pipe and a carbon steel pipe connected to the aluminum pipe; the aluminum pipe is connected to the water supply aluminum pipe, and the carbon steel pipe is connected to the intercooled water distributor; an annular rubber ring is provided between the aluminum pipe and the carbon steel pipe.

[0011] Preferably, the number of water outlets of the intercooled water distributor is ten, and the ten water outlets are arranged in two parallel rows.

[0012] Preferably, each SCAL type indirect cooling system radiator is equipped with eight of the aforementioned indirect cooling water distributors.

[0013] Preferably, the signal output terminals of multiple flow meters connected to the same SCAL type indirect cooling system radiator are all connected to the same control device; the control output terminal of the control device is connected one-to-one with the control terminals of multiple electromagnetic regulating valves corresponding to the SCAL type indirect cooling system radiator.

[0014] Preferably, the mechanical unit system further includes a cooling water distributor support and a water supply aluminum pipe support; the cooling water distributor is fixed by the cooling water distributor support; the water supply aluminum pipe is fixed by the water supply aluminum pipe support.

[0015] Secondly, the present invention provides an automatic water distribution method for the bottom water collection tank of a SCAL type indirect cooling system radiator, comprising the following steps: Start the circulating water pump so that the hot water from the condenser passes through the carbon steel water pipe in sequence through the flow meter and the electromagnetic regulating valve, and then enters the inlet of the intercooled water distributor. The flow meter detects the hot water flow in the pipeline in real time and transmits the flow signal to the control device; The control device generates an adjustment command according to the received flow signal and a preset control logic, and sends the adjustment command to the electromagnetic regulating valve; the electromagnetic regulating valve changes its opening degree according to the received adjustment command to regulate the flow rate of hot water in the pipeline where the electromagnetic regulating valve is located. After the flow rate is adjusted, the hot water is evenly distributed to each outlet through the intercooled water distributor, and then enters the corresponding water supply aluminum pipe through each aluminum pipe to carbon steel pipe joint, and finally delivered to the water collection tank at the bottom of the radiator to complete the automatic water distribution process.

[0016] Preferably, the preset control logic includes: After the circulating water pump is turned on, the control device waits for a first preset time, and then reads the flow data X1, X2, ..., X from all N flow meters connected to the control device that correspond to the same SCAL type indirect cooling radiator. N Wherein, the flow data X1 of the first flow meter corresponds to the first solenoid regulating valve, the flow data X2 of the second flow meter corresponds to the second solenoid regulating valve, and the flow data X of the Nth flow meter... N The corresponding electromagnetic regulating valve for the Nth channel; The control device calculates the arithmetic mean of the N flow data points. ; The control device calculates the first i The formula for calculating the traffic flow deviation value of a road is:

[0017] in, For the first i Traffic flow deviation value of the road; For the first i Flow data from the flow meter; Will Compare with preset positive and negative deviation thresholds; like If the positive deviation is greater than or equal to the positive deviation threshold, the control device generates and issues a command to adjust the first... i The opening of the electromagnetic regulating valve of the circuit decreases by a preset adjustment step until it reaches the preset minimum opening; if If the deviation is less than or equal to the negative deviation threshold, the control device generates and issues a command to adjust the first... i The opening of the solenoid regulating valve increases by a preset adjustment step until it reaches the preset maximum opening. After completing the flow data judgment and adjustment of all flow meters, the control device waits for a second preset time before starting the next round of flow data reading and adjustment, forming a closed-loop control cycle.

[0018] Compared with the prior art, the present invention has the following beneficial effects: The indirect cooling water distributor directly undertakes the crucial function of evenly distributing centralized incoming water to multiple aluminum water supply pipes. Simultaneously, a closed-loop feedback control circuit consisting of a flow meter, control device, and electromagnetic regulating valve provides the ability to monitor and dynamically adjust the flow rate of each branch in real time. This device improves the uniformity of the initial water flow distribution from the source through optimization of the mechanical water distribution structure. Combined with the calibration of the control device, it ensures the consistency of the flow rate and velocity of the water entering each aluminum water supply pipe, thus effectively solving the problems of uneven hydraulic distribution and localized high-speed scouring caused by traditional water tank inlet methods. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view of an air-cooled radiator in the prior art; Figure 2 for Figure 1 Side view; Figure 3 for Figure 1 A schematic diagram of corrosion on a medium-alloy tube; Figure 4 This is a schematic diagram of the automatic water distribution device for the bottom water collection tank of the SCAL type indirect cooling system radiator of the present invention; Figure 5 This is a schematic diagram of an electromagnetic control valve.

[0021] The components include: 1. Aluminum water supply pipe; 2. Aluminum pipe to carbon steel pipe connector; 3. Indirect cooling water distributor; 4. Solenoid valve control cable; 5. Distributed control system; 6. Communication cable; 7. Control device; 8. Flow meter signal cable; 9. Flow meter power cable; 10. MCC electronic room; 11. Solenoid valve power cable; 12. Indirect cooling water distributor support; 13. Aluminum water supply pipe support; 14. Solenoid regulating valve; 15. Flow meter; 16. Carbon steel water supply pipe; 101. Top water collection tank; 102. Bottom water collection tank; 103. Hot water inlet; 104. Cold water inlet; 105. Aluminum pipe bundle; 1051. No. 1 aluminum pipe; 1059. No. 9 aluminum pipe; 10515. No. 15 aluminum pipe; 10519. No. 19 aluminum pipe; 10522. No. 22 aluminum pipe; 10524. No. 24 aluminum pipe; 10540. No. 40 aluminum pipe. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply refers to its direction relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings: The first objective of this invention is to provide an automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator, such as... Figures 4-5 As shown, it includes a detection and control system and a mechanical unit system; the detection and control system includes a control device 7, an electromagnetic regulating valve 14 and a flow meter 15; the mechanical unit system includes a carbon steel water inlet pipe 16, an intercooled water distributor 3, an aluminum pipe to carbon steel pipe connector 2 and an aluminum water inlet pipe 1. The outlet of the carbon steel water pipe 16 is connected in sequence to the flow meter 15 and the electromagnetic regulating valve 14, and then connected to the inlet of the intercooled water distributor 3; the multiple outlets of the intercooled water distributor 3 are connected to the multiple water supply aluminum pipes 1 through the aluminum pipe to carbon steel pipe joint 2. The signal output terminal of the flow meter 15 is connected to the signal input terminal of the control device 7; the control output terminal of the control device 7 is connected to the control terminal of the electromagnetic regulating valve 14.

[0029] The flow meter 15 detects the water flow in each branch in real time and feeds the signal back to the control device 7. The control device 7 calculates the flow rate based on a preset algorithm (such as comparing the deviation of the flow rate of each branch from the average value) and outputs a control signal to dynamically adjust the opening of the electromagnetic regulating valve 14 on the corresponding branch. The circulating water transported by the carbon steel water pipe 16 first flows through the flow meter 15 for accurate flow measurement and the electromagnetic regulating valve 14 for flow regulation, and then enters the intercooled water distributor 3. The distributor, through flow channel optimization, can smoothly distribute the concentrated water flow from its inlet to its multiple outlets, and then smoothly introduce it into multiple parallel aluminum water supply pipes 1 through the aluminum pipe to carbon steel pipe joint 2. This device can compensate for the uneven flow caused by factors such as differences in pipe resistance in real time, ensuring that the water flow velocity and flow rate distributed to each aluminum water supply pipe 1 are highly consistent, thereby eliminating the pipe scouring corrosion caused by excessive local water flow impact from the root, and significantly improving the reliability and service life of the radiator.

[0030] For example, given that the circulating water in the SCAL type intercooling system is usually demineralized water with extremely low conductivity, the flow meter 15 is preferably a time-difference ultrasonic flow meter. This type of flow meter measures the flow velocity based on the time difference of ultrasonic waves propagating in the co-current and counter-current media. Its measurement principle is completely non-contact with the fluid being measured, and no measuring element needs to be installed in the pipeline. Therefore, it has excellent applicability to circulating water media with low conductivity and high purity, and can effectively avoid the problem of contact flow meters such as electrode type failing to work properly or measuring inaccurately in low conductivity environments.

[0031] Furthermore, to ensure the accuracy and stability of flow measurement results, sufficient straight pipe sections of appropriate length must be reserved and installed on both the upstream and downstream pipes of the time-difference ultrasonic flow meter. Since valves, elbows, reducers, and other pipe fittings can disturb the water flow, creating eddies or distorting the velocity distribution, sufficiently long straight pipe sections allow the water flow after passing these disturbance sources to fully develop and recover into a stable, symmetrical, and fully developed turbulent velocity profile before reaching the flow meter's measurement area. For example, the upstream straight pipe section length should typically be no less than 10 times the pipe diameter, and the downstream straight pipe section length no less than 5 times the pipe diameter.

[0032] For example, the aluminum pipe to carbon steel pipe joint 2 includes an aluminum pipe and a carbon steel pipe respectively connected to the outlet of the water supply aluminum pipe 1 and the indirect cooling water distributor 3; at the joint of the aluminum pipe and the carbon steel pipe, an annular rubber ring is provided, which is tightly pressed between the two metal end faces to form a physical isolation and elastic sealing barrier to prevent circulating water from leaking from the dissimilar metal joint; more importantly, it completely blocks the direct electrical contact between aluminum (a reactive metal) and carbon steel (relatively inactive) in the electrolyte (circulating water), thereby effectively avoiding the formation of a macroscopic galvanic corrosion cell at this critical connection point and preventing the aluminum pipe end from being accelerated to corrode due to acting as an anode; at the same time, the elastic buffering effect of the rubber ring can also partially absorb the slight stress and vibration caused by water flow or temperature changes, reducing the mechanical impact on the fragile aluminum pipe opening.

[0033] For example, the function of the indirect cooling water distributor 3 is to efficiently and evenly distribute a single stream of concentrated water to multiple aluminum water supply pipes 1. It includes one inlet and ten outlets, arranged in two parallel rows. This multi-outlet layout pre-distributes and guides the water flow, which would otherwise freely diffuse within a large water collection tank, easily forming uneven flow fields or even local jets, through a reasonable flow channel design and guide baffles within the compact distributor. This actively divides and guides the water flow entering from a single inlet to ten independent outlet channels. The purpose of dividing the ten outlets into two parallel rows is to better match the spatial distribution of the outlets with the original geometric arrangement of the radiator tube bundle (usually multiple rows of tube bundles), facilitating pipe connections and spatial arrangement. It also allows the water flowing from the distributor to enter the corresponding aluminum pipes with closer flow and resistance conditions, laying a good initial distribution foundation for subsequent fine-tuning of the flow rate via valves.

[0034] Meanwhile, each SCAL type indirect cooling system radiator is equipped with eight indirect cooling water distributors 3. Each distributor is independently responsible for supplying water to a set of aluminum water supply pipes (corresponding to its ten outlets) in a specific area. The eight distributors can cover the entire water supply distribution needs of the bottom of the radiator by operating in parallel.

[0035] For example, the signal output terminals of multiple flow meters 15 connected to the same SCAL type intercooling system radiator are all connected to the same control device 7; the control output terminal of the control device 7 is connected one-to-one with the control terminals of multiple electromagnetic regulating valves 14 corresponding to the SCAL type intercooling system radiator.

[0036] The control device 7 can simultaneously collect real-time flow data from eight parallel branches, perform unified calculations within the processor (such as calculating total flow, flow in each branch, average flow, and deviation values), and concurrently generate and issue independent, differentiated control commands to each electromagnetic regulating valve 14 based on preset control logic. This centralized processing mode not only avoids the increased hardware costs and system complexity caused by configuring an independent controller for each branch, but more importantly, it ensures that all control decisions are based on global data at the same moment, eliminating the signal asynchrony or decision conflict problems that may exist in decentralized control, thereby ensuring the synergy of flow regulation actions in each branch and the rapid and accurate achievement of the overall flow equalization target.

[0037] For example, the mechanical unit system also includes an indirect cooling water distributor support 12 and an inlet water aluminum pipe support 13; wherein, the indirect cooling water distributor 3 is firmly installed on the bottom steel structure or foundation of the radiator by the indirect cooling water distributor support 12 to prevent the distributor from shifting, the interface from loosening or leaking due to gravity or vibration; at the same time, the inlet water aluminum pipe 1 is fixed at multiple points by the inlet water aluminum pipe support 13. This support is usually integrated with the original frame of the radiator. Its function is to constrain the verticality and position of the aluminum pipe, prevent the slender aluminum pipe from shaking or bending excessively due to water flow impact or its own weight, thereby protecting the sealing of the fragile aluminum pipe opening and the connection of the lower adapter, and maintaining the predetermined spacing between each aluminum pipe.

[0038] For example, the detection and control system also includes a distributed control system (DCS) 5. The control device 7 establishes a data connection with the distributed control system 5 through a communication cable 6, and uploads the collected analog flow signals of all branches, the status and opening signals of each electromagnetic regulating valve 14, and the operating status of the device itself to the distributed control system 5. At the same time, the control device 7 has an operation mode selection function, which can switch to local control or remote control mode according to the operation needs. In remote control mode, the distributed control system 5 acts as a superior monitoring system, providing operators with a centralized and intuitive human-machine interface, which can monitor the operating parameters and balancing effect of the entire automatic water distribution system in real time, and issue advanced commands or set values ​​to the control device 7 through the distributed control system 5 when necessary (such as during automatic control loop maintenance or special working conditions), so as to realize remote intervention and optimization management by operators. In local control mode, the control device 7 independently executes its built-in closed-loop regulation program to ensure the autonomous and reliable operation of the core flow equalization function.

[0039] Furthermore, the electrical connection between the detection and control system and the mechanical unit system is achieved via cables. Specifically, the control terminal of the solenoid regulating valve 14 is connected to the control output terminal of the control device 7 via the solenoid valve control cable 4; the signal output terminal of the flow meter 15 is connected to the signal input terminal of the control device 7 via the flow meter signal cable 8; in addition, the power supply for the flow meter 15 and the solenoid regulating valve 14 is provided by the flow meter power cable 9 and the solenoid valve power cable 11 from the MCC electronics room 10, respectively, ensuring the stable and reliable operation of the field equipment.

[0040] The second objective of this invention is to provide an automatic water distribution method for the bottom water collection tank of a SCAL type indirect cooling system radiator, comprising the following steps: Start the circulating water pump so that the hot water from the condenser passes through the carbon steel water pipe 16, the flow meter 15 and the electromagnetic regulating valve 14 in sequence, and then enters the inlet of the intercooled water distributor 3. The flow meter 15 detects the hot water flow in the pipeline in real time and transmits the flow signal to the control device 7; The control device 7 generates an adjustment command according to the received flow signal and a preset control logic, and sends the adjustment command to the electromagnetic regulating valve 14; the electromagnetic regulating valve 14 changes its opening degree according to the received adjustment command to regulate the flow rate of hot water in the pipeline where the electromagnetic regulating valve 14 is located. After the flow rate is adjusted, the hot water is evenly distributed to each outlet of the indirect cooling water distributor 3, and then enters the corresponding water supply aluminum pipe 1 through each aluminum pipe to carbon steel pipe joint 2, and finally delivered to the water collection tank at the bottom of the radiator to complete the automatic water distribution process.

[0041] This method can proactively identify and compensate in real time for flow unevenness caused by differences in pipeline characteristics or changes in operating conditions, ensuring that each aluminum water supply pipe 1 receives nearly equal cooling water flow, thereby completely eliminating the mechanical scouring force caused by excessively high local water flow velocity or sudden changes in flow direction. Thus, this method solves the long-standing problem of scouring and corrosion at the aluminum pipe inlets of SCAL-type indirect cooling systems from the root of hydraulic distribution, not only greatly extending the service life of key heat dissipation equipment but also significantly improving the safety and reliability of the entire indirect cooling system, providing a fundamental guarantee for the long-term stable and economical operation of the unit.

[0042] The preset control logic includes: After the circulating water pump is turned on, the control device 7 waits for a first preset time, and then reads the flow data X1, X2, ..., X from all N flow meters 15 connected to the control device 7 and corresponding to the same SCAL type indirect cooling radiator. N Wherein, the flow data X1 of the first flow meter 15 corresponds to the first solenoid regulating valve 14, the flow data X2 of the second flow meter 15 corresponds to the second solenoid regulating valve 14, and the flow data X of the Nth flow meter 15... N The corresponding electromagnetic regulating valve 14 for the Nth channel; The control device 7 calculates the arithmetic mean of the N flow data points. ; The control device 7 calculates the first i The formula for calculating the traffic flow deviation value of a road is:

[0043] in, For the first i Traffic flow deviation value of the road; For the first i Flow data from flow meter 15; Will Compare with preset positive and negative deviation thresholds; like If the positive deviation is greater than or equal to the positive deviation threshold, then the control device 7 generates and issues a command to adjust the first... i The opening of the electromagnetic regulating valve 14 of the circuit decreases by a preset adjustment step until it reaches the preset minimum opening; if If the deviation is less than or equal to the negative deviation threshold, the control device 7 generates and issues a command to adjust the first... i The opening of the solenoid regulating valve 14 increases by a preset adjustment step until it reaches the preset maximum opening. After completing the flow data judgment and adjustment of all flow meters 15, the control device 7 waits for the second preset time and then starts the next round of flow data reading and adjustment, forming a closed-loop control cycle.

[0044] This invention transforms the complex multivariate flow balancing problem into independent and parallel adjustment actions based on threshold judgment by periodically collecting the flow rate of each branch and calculating its relative deviation from the average value. This logical design has the advantages of strong robustness, intuitive parameters, and ease of tuning and debugging, and can effectively cope with measurement noise and operating condition fluctuations in industrial settings. Through continuous cycling, the system can gradually and stably converge the flow rates of all branches to a highly balanced state, fundamentally eliminating the long-term flow unevenness caused by initial installation differences or resistance changes during operation, and achieving uniform water distribution.

[0045] Example Before the circulating water pump is started, the control device 7 sets all the electromagnetic regulating valves 14 connected to it to the fully open state (i.e., 100% opening degree) to establish the initial flow path for the system.

[0046] After the circulating water pump starts running, control device 7 enters the waiting stage. After 5 minutes, when the water flow in the pipeline is basically stable, control device 7 begins data acquisition. Taking a typical SCAL type indirect cooling radiator with eight water distributor units as an example (i.e., N=8), control device 7 synchronously reads the real-time flow data of its eight corresponding flow meters 15, which are recorded as X1, X2, ..., X8.

[0047] Control device 7, based on the eight collected flow data points, uses a function... Calculate its arithmetic mean The average value This serves as the baseline value for the flow balance target in this adjustment cycle.

[0048] Control device 7 then performs an independent analysis on each branch (i=1~8). For the i-th branch, its relative flow deviation value is calculated. The calculated f(x) is compared with a preset deviation threshold. In this embodiment, the positive deviation threshold is set to 0.1 (i.e., +10%) and the negative deviation threshold is set to -0.1 (i.e., -10%).

[0049] If f(x) ≥ 0.1: This indicates that the actual flow rate X of the i-th path is... i The current is significantly higher than the average level, posing a risk of overcurrent. At this point, the control device 7 generates a control command to reduce the opening of the electromagnetic regulating valve 14 corresponding to this branch by 10%. The adjusted opening is limited to ensure that it is not lower than the preset minimum opening (e.g., 0%, i.e., fully closed).

[0050] If f(x) ≤ -0.1: It indicates that the actual flow rate Xi of the ith path i is significantly lower than the average level, and there may be insufficient water distribution. At this time, the control device 7 generates a control instruction to increase the opening degree of the electromagnetic regulating valve 14 corresponding to this branch by 10%. The adjusted opening degree is limited to ensure that it does not exceed the preset maximum opening degree (for example, 100%, that is, fully open).

[0051] If -0.1 < f(x) < 0.1: It indicates that the flow rate of the ith path is within the allowable equilibrium range, and the electromagnetic regulating valve 14 of this branch remains unchanged at the current opening degree during this round of adjustment.

[0052] After completing the judgment of all eight branches and the adjustment of the corresponding valves, the control device 7 enters the waiting stage. After 30 minutes, it automatically starts the next round of flow data reading, average value calculation, deviation analysis, and valve adjustment, forming a continuous closed-loop control cycle.

[0053] Record the adjustment process, and the results are shown in Table 1: Table 1 Test data of the flow rate equalization adjustment process of the automatic water distribution device

[0054] As shown in Table 1, at the initial stage of the device operation (14:00), the flow rate distribution of each branch is extremely uneven (X4 and X5 are much higher than others). Through multiple cyclic iterations of the above control logic, the system successfully adjusts the flow rate of each branch to a highly balanced state (the values of X1 to X8 are very close) within several hours (until 17:00). This result proves that the present invention can effectively make the system automatically converge to the state of uniform flow rate distribution, solving the problems of uneven flow rate and preventing corrosion of the pipe mouths.

[0055] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator, characterized in that, It includes a detection and control system and a mechanical unit system; the detection and control system includes a control device (7), an electromagnetic regulating valve (14) and a flow meter (15); the mechanical unit system includes a carbon steel water inlet pipe (16), an intercooled water distributor (3), an aluminum pipe to carbon steel pipe connector (2) and an aluminum water supply pipe (1). The outlet of the carbon steel water pipe (16) is connected in sequence to the flow meter (15) and the electromagnetic regulating valve (14), and then connected to the inlet of the intercooled water distributor (3); the multiple outlets of the intercooled water distributor (3) are connected to multiple aluminum water supply pipes (1) through the aluminum pipe to carbon steel pipe joint (2). The signal output terminal of the flow meter (15) is connected to the signal input terminal of the control device (7); the control output terminal of the control device (7) is connected to the control terminal of the electromagnetic regulating valve (14).

2. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, The flow meter (15) is a time-difference ultrasonic flow meter.

3. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, Both upstream and downstream of the flow meter (15) have straight pipe sections that meet the measurement accuracy requirements of the flow meter (15).

4. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, The aluminum pipe to carbon steel pipe joint (2) includes an aluminum pipe and a carbon steel pipe connected to the aluminum pipe; the aluminum pipe is connected to the water supply aluminum pipe (1), and the carbon steel pipe is connected to the intercooled water distributor (3); an annular rubber ring is provided between the aluminum pipe and the carbon steel pipe.

5. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, The intercooled water distributor (3) has ten outlets, which are arranged in two parallel rows.

6. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, Each SCAL type indirect cooling system radiator is equipped with eight of the aforementioned indirect cooling water distributors (3).

7. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, The signal output terminals of multiple flow meters (15) connected to the same SCAL type intercooling system radiator are all connected to the same control device (7); the control output terminal of the control device (7) is connected one-to-one with the control terminals of multiple electromagnetic regulating valves (14) corresponding to the SCAL type intercooling system radiator.

8. The automatic water distribution device for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 1, characterized in that, The mechanical unit system also includes an intercooled water distributor support (12) and an aluminum water supply pipe support (13); the intercooled water distributor (3) is fixed by the intercooled water distributor support (12); the aluminum water supply pipe (1) is fixed by the aluminum water supply pipe support (13).

9. An automatic water distribution method for the bottom water collection tank of a SCAL type indirect cooling system radiator, characterized in that, The apparatus according to any one of claims 1 to 8 includes the following steps: Start the circulating water pump so that the hot water from the condenser passes through the carbon steel water pipe (16) and then through the flow meter (15) and the electromagnetic regulating valve (14) before entering the inlet of the intercooled water distributor (3); The flow meter (15) detects the hot water flow in the pipeline in real time and transmits the flow signal to the control device (7). The control device (7) generates an adjustment command according to the received flow signal and a preset control logic, and sends the adjustment command to the electromagnetic regulating valve (14); the electromagnetic regulating valve (14) changes its opening degree according to the received adjustment command to regulate the flow rate of hot water flowing through the pipeline where the electromagnetic regulating valve (14) is located. After the flow rate is adjusted, the hot water is evenly distributed to each outlet of the intercooled water distributor (3), and enters the corresponding water supply aluminum pipe (1) through each aluminum pipe to carbon steel pipe joint (2), and is finally delivered to the water collection tank at the bottom of the radiator to complete the automatic water distribution process.

10. The automatic water distribution method for the bottom water collection tank of a SCAL type indirect cooling system radiator according to claim 9, characterized in that, The preset control logic includes: After the circulating water pump is turned on, the control device (7) waits for a first preset time, and then reads the flow data X1, X2, ..., X from all N flow meters (15) connected to the control device (7) and corresponding to the same SCAL type indirect cooling radiator. N Among them, the flow data X1 of the first flow meter (15) corresponds to the first electromagnetic regulating valve (14), the flow data X2 of the second flow meter (15) corresponds to the second electromagnetic regulating valve (14), and the flow data X of the Nth flow meter (15) N The corresponding electromagnetic regulating valve (14) for the Nth channel; The control device (7) calculates the arithmetic mean of the N flow data based on the N flow data. ; The control device (7) calculates the first i The formula for calculating the traffic flow deviation value of a road is: in, For the first i Traffic flow deviation value of the road; For the first i Flow data from the flow meter (15); Will Compare with preset positive and negative deviation thresholds; like If the positive deviation is greater than or equal to the positive deviation threshold, the control device (7) generates and issues a command to adjust the first... i The opening of the electromagnetic regulating valve (14) of the circuit decreases by a preset adjustment step until it reaches the preset minimum opening; if If the deviation is less than or equal to the negative deviation threshold, the control device (7) generates and issues a command to adjust the first deviation. i The opening of the solenoid regulating valve (14) increases by a preset adjustment step until the preset maximum opening is reached; After completing the flow data judgment and adjustment of all flow meters (15), the control device (7) waits for the second preset time and then starts the next round of flow data reading and adjustment, forming a closed-loop control cycle.

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