Industrial circulating cooling water energy-saving system

Abstract

The utility model provides an industrial circulating cooling water energy-saving system which comprises a cooling tower, a water pump, a heat exchanger, a draught fan, a valve, a working condition collecting device and an automatic control device. The automatic control device is in communication connection with the water pump, the fan, the valve and the working condition acquisition device, and the automatic control device receives data acquired by the working condition acquisition device and controls the industrial circulating cooling water energy-saving system according to the acquired data; data acquired by the working condition acquisition device comprises a vibration signal of the fan, a temperature signal of the fan, water return pressure and the temperature of circulating cooling water in the cooling tower. According to the industrial circulating cooling water energy-saving system, the automatic control device receives the data collected by the working condition collecting device and controls the industrial circulating cooling water energy-saving system to work under different working conditions according to the collected data, energy consumption is reduced, the automation degree of the system is high, and cost is low.

Description

Technical Field

[0001] The present application relates to the technical field of industrial circulating cooling water systems, and in particular to an industrial circulating cooling water energy-saving system. Background Art

[0002] Industrial circulating cooling water systems are widely used in various fields of process industries, including the steel and chemical industries. These systems use water as a medium for indirect, non-contact cooling of process system media. In existing applications, the design of industrial circulating cooling water systems typically prioritizes adequate cooling of the media within production process units, thus allowing for margins in the cooling tower. However, in practice, the associated equipment (such as cooling fans and circulating water pumps) consumes a lot of energy. Furthermore, manual process settings are required during system operation, resulting in energy waste, low efficiency, and high energy consumption. Summary of the Invention

[0003] The embodiment of the present application discloses an industrial circulating cooling water energy-saving system to solve the technical problems of energy waste and low efficiency and high energy consumption.

[0004] The present application is implemented through the following technical solutions: An industrial circulating cooling water energy-saving system, comprising a cooling tower, a water pump, a heat exchanger, a fan, a valve, a working condition acquisition device and an automatic control device, wherein the cooling tower, the water pump, the heat exchanger, the working condition acquisition device, the valve and the fan are connected in series in sequence through a closed-loop pipeline, the automatic control device is communicatively connected with the water pump, the fan, the valve and the working condition acquisition device, the automatic control device receives data collected by the working condition acquisition device and controls the industrial circulating cooling water energy-saving system according to the collected data, wherein the data collected by the working condition acquisition device include the vibration signal of the fan, the temperature signal of the fan and the cooling tower The return water pressure, outlet water pressure, return water temperature, outlet water temperature and cooling water flow of the circulating cooling water; the automatic control device also controls the fan and the water pump to operate in different working states, and the working condition acquisition device also includes an instrument detection unit, which sends the detected return water pressure to the automatic control device. When the automatic control device determines that the return water pressure is greater than or equal to the preset pressure, it sends a control instruction to increase the opening of the valve to the valve to increase the valve opening; when the automatic control device determines that the return water pressure is less than the preset pressure, it sends a control instruction to reduce the opening of the valve to the valve to reduce the valve opening.

[0005] Furthermore, the valve includes an upper tower valve and a bypass valve, wherein the upper tower valve is an adjustable opening electric regulating valve, and the bypass valve is a switch valve, and the automatic control device sends the control instruction of increasing / decreasing the valve opening to the upper tower valve.

[0006] Furthermore, the working state includes a first state, a second state and a third state, the speed of the fan in the first state is greater than or equal to the speed in the second state, the speed of the fan in the second state is less than the speed in the first state and greater than or equal to the speed in the third state; at the same time, the speed of the water pump in the first state is greater than or equal to the speed in the second state, the speed of the water pump in the second state is less than the speed in the first state and greater than or equal to the speed in the third state.

[0007] Furthermore, the water pump is an energy-saving variable water pump, which includes an impeller, a pump casing, a drive shaft, a first motor, inlet and outlet pipes and a hydraulic system. The impeller includes blades and a disc, the blades are installed on the disc, and the disc is arranged on the drive shaft. One end of the drive shaft is connected to the output shaft of the first motor, and the other end is connected to the center of the impeller. The first motor drives the drive shaft to rotate to drive the impeller to rotate. The automatic control device receives the data collected by the working condition acquisition device, and adjusts the hydraulic system according to the collected data to realize automatic control of the water pump.

[0008] Furthermore, the fan is an energy-saving cooling fan, which includes a second motor, fan blades and a frequency conversion control cabinet. The second motor is a permanent magnet synchronous motor, which is connected to the frequency conversion control cabinet. The frequency conversion control cabinet receives the instructions sent by the automatic control device and outputs them to the second motor, thereby driving the fan blades to rotate by controlling the rotation of the second motor.

[0009] Furthermore, the frequency conversion control cabinet includes a fan monitoring device and a second motor monitoring device, the fan monitoring device is used to monitor the vibration signal of the fan in real time, and the second motor monitoring device is used to monitor the temperature signal of the second motor in real time; when the fan monitoring device monitors the vibration signal of the fan, the vibration signal is sent to the automatic control device; when the second motor monitoring device monitors the temperature signal of the second motor, the temperature signal is sent to the automatic control device.

[0010] Furthermore, when the automatic control device determines that the temperature signal is greater than or equal to a preset temperature, a stop command is sent to the second motor so that the second motor stops running in time; when the automatic control device determines that the vibration signal is greater than or equal to a preset vibration intensity, a stop command is sent to the second motor so that the fan stops running in time.

[0011] Furthermore, the working condition acquisition device includes a temperature sensor, a transmitter and a transmitter control box. The temperature sensor is used to monitor the temperature information of the circulating cooling water in real time, and send the monitored temperature information to the transmitter, and the measured temperature information is transmitted to the automatic control device in real time through the transmitter.

[0012] Furthermore, the working condition acquisition device also includes a pressure sensor, a transmitter and a transmitter electronic control box. The pressure sensor is used to monitor the pipeline pressure information of the circulating cooling water in real time, and send the monitored pipeline pressure information to the transmitter, and the measured pressure information is transmitted to the automatic control device in real time through the transmitter.

[0013] Furthermore, the working condition acquisition device also includes a flow meter, which is used to monitor the pipeline flow of circulating cooling water in real time and transmit the monitored pipeline flow information to the automatic control device in real time.

[0014] The industrial circulating cooling water energy-saving system provided in the present application includes a cooling tower, a water pump, a heat exchanger, a fan, a valve, a working condition collection device and an automatic control device, wherein the cooling tower, the water pump, the heat exchanger, the working condition collection device, the valve and the fan are connected in series in sequence through a closed-loop pipeline, and the automatic control device is communicatively connected with the water pump, the fan, the valve and the working condition collection device. The automatic control device receives data collected by the working condition collection device and controls the industrial circulating cooling water energy-saving system to operate under different working conditions according to the collected data, thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the industrial circulating cooling water energy-saving system provided in an embodiment of the present application.

[0016] Figure 2 This is a schematic diagram of an industrial circulating cooling water energy-saving system provided in another embodiment of the present application.

[0017] Figure 3 It is a structural diagram of the automatic control device in an embodiment of the present application. DETAILED DESCRIPTION

[0018] To facilitate understanding, some illustrations of concepts related to the embodiments of the present application are given for reference.

[0019] It should be noted that, in this application, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A alone, A and B together, and B alone, where A and B can be singular or plural. The terms "first," "second," "third," "fourth," and so on (if any) in the specification, claims, and drawings of this application are used to distinguish similar objects, not to describe a specific order or precedence.

[0020] An industrial circulating cooling water system typically consists of a circulating water pump, cooling tower, cooling fan, heat exchanger, main pipeline, branch pipelines, valves, and instrumentation control systems. The general operating principle is as follows: Circulating cooling water is pumped from the cooling tower's pool to the heat exchanger via a circulating water pump. The circulating cooling water then exchanges heat with the medium in the heat exchanger, raising the water temperature and cooling the medium. After passing through the heat exchanger, the circulating cooling water returns to the cooling tower, where it is distributed by gravity through water distributors installed within the cooling tower. As it falls, it comes into contact with the air, cooling it. Simultaneously, a cooling fan mounted at the top of the cooling tower ventilates and dissipates heat, thereby lowering the circulating cooling water temperature. The cooling fan increases the volume of circulating cooling water in contact with air, accelerating the temperature drop. Typically, a heat exchanger has four ports: two for the incoming and outgoing circulating cooling water, and two for the incoming and outgoing medium.

[0021] In related technologies, to ensure sufficient cooling of the medium in the heat exchanger, cooling tower designs are conservative, with margins reserved for cooling towers. However, in actual operation, cooling towers often waste energy for long periods of time, resulting in high energy consumption. To address this issue, the present application provides an industrial circulating cooling water system that can automatically control the system based on collected operating data, reducing ineffective energy consumption and increasing energy savings.

[0022] In the embodiments of this application, Figure 1 and Figure 2As shown, the industrial circulating cooling water energy-saving system 10 includes an automatic control device 1, a water pump 2, a heat exchanger 3, a working condition collection device 4, a valve 5, a fan 6, and a cooling tower 7. The water pump 2, heat exchanger 3, working condition collection device 4, valve 5, fan 6, and cooling tower 7 are connected in series via a closed-loop pipeline. The automatic control device 1 is communicatively connected to the water pump 2, heat exchanger 3, working condition collection device 4, valve 5, and fan 6. The water pump 2 can be an energy-saving variable-displacement water pump, i.e., an adjustable pump with a variable impeller that can adjust flow and pressure as needed. In this embodiment of the present application, the automatic control device 1 can be communicatively connected to the water pump 2, valve 5, and fan 6, as well as to the cloud and a distributed control system (DCS). The water pump 2 can send water pump operating data to the automatic control device 1. The automatic control device 1 determines control instructions based on the water pump operating data and sends the control instructions to the water pump to control the water pump opening. Valve 5 can transmit valve operating data to automatic control device 1. Automatic control device 1 determines control instructions based on the valve operating data and sends these instructions to valve 5 to control the opening of the valve 5 pump. Fan 6 can transmit fan operating data to automatic control device 1. Automatic control device 1 determines control instructions based on the fan operating data and sends these instructions to the fan to control its rotation. The present application can also transmit monitored process operating data (such as pressure, flow, temperature, and current) to automatic control device 1. In the embodiment of the present application, water pump 2 includes an impeller, a pump casing, a drive shaft, a first motor, inlet and outlet pipes, and a hydraulic system. The impeller is the core component of the water pump, responsible for converting mechanical energy into kinetic energy of the fluid. The impeller includes blades and a disc. The impeller typically has multiple blades, mounted on a disc, which is mounted on a drive shaft. One end of the drive shaft is connected to the output shaft of the first motor and the other end is connected to the center of the impeller. The first motor can drive the drive shaft to rotate, thereby driving the impeller. The drive shaft must have sufficient strength and rigidity to withstand the torque and vibration during operation. It should be noted that the angle or position of the blades mounted on the wheel disc can be adjusted.

[0023] In the embodiment of the present application, the pump housing is used to accommodate the impeller, the drive shaft, the first motor, the inlet and outlet pipes, and the hydraulic system. The pump housing provides a path for the circulating cooling water to flow and protects the internal components from the external environment.

[0024] In the embodiment of the present application, the first motor is the power source of the water pump 2, which drives the impeller to rotate through the drive shaft. The first motor can be an AC motor or a DC motor, which is not limited in the present application.

[0025] In the embodiments of the present application, the inlet and outlet pipes include an inlet pipe and an outlet pipe. The inlet pipe connects to the suction port of the water pump, allowing the circulating cooling water to enter the pump. The outlet pipe connects to the pressure port of the water pump, transporting the circulating cooling water to other parts of the hydraulic system. The inlet pipe is typically made of metal or high-strength plastic to ensure the safe transmission of the circulating cooling water.

[0026] In an embodiment of the present application, a hydraulic system includes valves, actuators, and other components that work together to control the flow and pressure of circulating cooling water. The hydraulic system is connected to a water pump and is used to adjust the impeller opening of the water pump, thereby changing the operating efficiency of the water pump. The hydraulic system is implemented by configuring a field programmable logic controller (PLC) within the water pump. For example, the hydraulic system can adjust the impeller opening of the water pump, change the operating efficiency of the water pump, and simultaneously change the process's operating pump outlet pressure and pumping flow rate.

[0027] In the embodiment of the present application, the automatic control device 1 is used to monitor and adjust the parameters of the water pump 2. For example, the parameters of the water pump 2 include flow rate, pressure, and temperature. The automatic control device 1 is connected to the hydraulic system and can receive collected operating condition data (for example, the flow rate, pressure, and temperature of the variable displacement pump) and adjust the hydraulic system based on the collected operating condition data to achieve automatic control of the water pump 2.

[0028] In some embodiments of the present application, the hydraulic system in water pump 2 receives a preset signal from the automatic control device 1, where the preset signal is used to control the opening of water pump 2. After receiving the preset signal, the system determines the difference between a first opening in the preset signal and a current second opening of water pump 2, triggering a solenoid valve to control the direction of oil pressure in the hydraulic system. This determines whether the opening should be increased or decreased based on the difference between the first and second openings. For example, when the first opening is less than the second opening, the system determines whether the opening should be decreased; and when the first opening is greater than the second opening, the system determines whether the opening should be increased. It should be noted that the increase and / or decrease in opening can be controlled by a programmable logic controller (PLC) in the hydraulic system. The system compares the first opening in the preset signal sent by the automatic control device 1 with the current second opening, and increases and / or decreases the opening based on the comparison result. Alternatively, the PLC in the hydraulic system can upload the water pump signal to the automatic control device 1. In one embodiment, the preset signal is a current signal between 4mA and 20mA.

[0029] In this embodiment of the present application, the first motor rotates the impeller via the drive shaft. The impeller generates a pressure differential within the pump casing, pushing circulating cooling water in through the inlet pipe and out through the outlet pipe. The hydraulic system regulates the flow and pressure of the circulating cooling water according to the instructions of the automatic control device 1. This allows the water pump 2 to provide stable flow and pressure under different operating conditions, meeting the requirements of the hydraulic system.

[0030] In the embodiment of the present application, by adopting an energy-saving variable pump, the pumping flow of the water pump can be adjusted independently, thereby improving the operating efficiency of the water pump. Compared with other designs that mainly use frequency converters to control water pumps, the present application reduces the links of electrical and auxiliary facilities, reduces operation and maintenance expenses and maintenance costs. Specifically, the start and stop of water pump 2 is controlled by a frequency converter. Due to the reduction in frequency, the output speed of the first motor is reduced. When the impeller diameter of water pump 2 remains unchanged, the speed reduction reduces the water pressure head, which cannot guarantee the requirements of normal production process. The adjustable impeller variable pump adopted in the present application changes this link, so that when the power supply frequency of the first motor is 50HZ, the impeller diameter of water pump 2 remains unchanged. After the opening on the axis becomes larger or smaller, the water pressure head basically does not change. Therefore, the industrial circulating cooling water energy-saving system provided by the present application is very suitable for industrial circulating cooling water energy-saving systems that have energy-saving adjustment requirements but have strict requirements on the water pressure head out of the tower.

[0031] In an embodiment of the present application, the fan 6 is an energy-saving cooling fan. The fan 6 includes a second motor, fan blades and a frequency conversion control cabinet. The second motor can be a permanent magnet synchronous motor. The second motor is connected to the frequency conversion control cabinet, which receives the instructions sent by the automatic control device and outputs them to the second motor, and drives the fan blades to rotate by controlling the rotation of the second motor. Specifically, the automatic control device sends a control instruction to control the operating rate of the fan 6. For example, the frequency conversion control cabinet receives the instruction sent by the automatic control device and requests the frequency conversion control cabinet to reduce the power supply frequency of the second motor from 18HZ to 0hz, so that the speed of the fan gradually decreases to zero. Specifically, the frequency conversion control cabinet receives the control instruction sent by the automatic control device and sends the control instruction to the frequency converter, which converts the control instruction into a corresponding frequency setting value and sends it to the second motor, so that the second motor changes the power supply frequency to accurately control the speed of the fan.

[0032] In an embodiment of the present application, the frequency conversion control cabinet includes a fan monitoring device and a second motor monitoring device. The fan monitoring device is used to monitor the vibration signal of the fan 6 in real time, and the second motor monitoring device is used to monitor the temperature signal of the second motor in real time. In some embodiments, the fan monitoring device can be a vibration sensor, and the second motor monitoring device can be a temperature sensor. When the fan monitoring device detects the vibration signal of the fan, the vibration signal is sent to the automatic control device 1; when the second motor monitoring device detects the temperature signal of the second motor, the temperature signal is sent to the automatic control device 1. The temperature signal and vibration signal are monitored in real time by the automatic control device 1 to ensure that the fan operates in the most ideal working condition.

[0033] For example, when the automatic control device 1 determines that the temperature signal is greater than or equal to the preset temperature, it is determined that the second motor is operating abnormally and needs to be stopped. The automatic control device 1 sends a stop instruction to the second motor, so that the second motor stops running in time. When the automatic control device 1 determines that the temperature signal is less than the preset temperature, it is determined that the second motor is operating normally and there is no need to stop the second motor. The automatic control device 1 does not perform any operation. When the automatic control device 1 determines that the vibration signal is greater than or equal to the preset vibration intensity, it is determined that the fan is operating abnormally and needs to be stopped. The automatic control device 1 sends a stop instruction to the second motor, so that the fan stops running in time. When the automatic control device 1 determines that the vibration signal is less than the preset vibration intensity, it is determined that the fan is operating normally and there is no need to stop the fan. The automatic control device 1 does not perform any operation.

[0034] In one embodiment of the present application, the fan 6 also includes a transmission control cabinet. The transmission control cabinet contains multiple modules. For example, a frequency converter, a primary circuit and protection, a secondary circuit module, and a monitoring module. Among them, the secondary circuit module is used to interact with the automatic control device 1. For example, the automatic control device 1 outputs a switch signal (normally open or normally closed contact) to control the start and stop of the fan 6. The frequency converter is arranged in the frequency converter cabinet and is connected to the second motor through a cable. The second motor includes a sensor protection device, which includes a temperature thermistor of the three-phase stator and a shaft temperature thermistor at the front and rear ends. During the operation of the fan 6, the sensor protection device sends the thermistor signal to the secondary circuit module in the transmission control cabinet. The secondary circuit module then converts the thermistor signal into a 4mA-20mA current signal and sends it to the automatic control device 1. After receiving the current signal, the automatic control device 1 determines the operating status of the fan 6 based on the current signal. If the automatic control device 1 determines that the current signal is greater than or equal to the preset current value, it determines that the fan 6 is in an abnormal state and requires a warning or shutdown state, then the signal to be sent to the inverter is changed to control the stop of the fan to protect the fan; if the automatic control device 1 determines that the current signal is less than the preset current value, it determines that the fan 6 is in a normal operating state and no operation is required.

[0035] In this embodiment of the present application, the operating condition acquisition device 4 also includes a temperature sensor and a first transmitter, both located within a transmitter control box. The temperature sensor monitors the temperature of the circulating cooling water in real time and transmits this temperature information to the first transmitter, which then transmits the measured temperature information to the automatic control device 1 in real time. The transmitter control box is used to power the operating condition acquisition device 4 and provide on-site protection.

[0036] In the embodiment of the present application, valve 5 includes an upper tower valve and a bypass valve. The upper tower valve is an adjustable electric regulating valve, and the bypass valve is an on-off valve. The instrument detection unit transmits the detected return water pressure to the automatic control device. When the automatic control device 1 determines that the return water pressure is greater than or equal to a preset pressure, it sends a control instruction to increase the opening of the upper tower valve, causing the upper tower valve to open more. When the automatic control device 1 determines that the return water pressure is less than the preset pressure, it sends a control instruction to decrease the opening of the upper tower valve, causing the upper tower valve to open less. Generally, the larger the opening of the upper tower valve, the more energy-efficient the industrial circulating cooling water energy-saving system 10. Because the water pump 2 provides power consumption and returns to the upper tower valve after heat exchange, if the valve 5 is opened too narrowly, a lot of energy is lost in the valve 5. Therefore, the wider the opening of the valve 5, the better. However, in actual applications, if the valve 5 is opened too wide, the return water pipeline will not be pressurized, which can easily lead to insufficient pressure in the heat exchanger 3. Different systems have different pipe diameters and pumping capacities, and the corresponding openings of the upper tower valves are also different. This application facilitates centralized control and improves system efficiency by setting an adjustable opening electric regulating valve.

[0037] In one embodiment of the present application, valve 5 may be a constant-pressure valve unit comprising a valve mechanism unit and an adjustable electronically controlled actuator. The valve mechanism unit and the adjustable electronically controlled actuator are mechanically connected. The automatic control device 1 can communicate with the adjustable electronically controlled actuator of valve 5, which then provides feedback on the valve body opening of valve 5 to the automatic control device 1. The valve body opening is a fixed quantity; at any opening, only a specific opening signal is transmitted to the adjustable electronically controlled actuator. After receiving the feedback signal (4-20 mA current signal) from the valve opening feedback unit in the adjustable electronically controlled actuator, the automatic control device 1 determines whether the valve opening needs to be adjusted. If adjustment is determined, the valve opening signal (4-20 mA current signal) is transmitted to the adjustable electronically controlled actuator, which then adjusts the valve opening to the desired value. In this embodiment of the present application, the operating condition acquisition device 4 also includes a vibration sensor and an instrument detection unit. The vibration sensor is used to monitor the vibration signal of the fan, and the instrument detection unit is used to detect the return water pressure.

[0038] In the embodiment of the present application, the automatic control device 1 receives data collected by the operating condition acquisition device and controls the industrial circulating cooling water energy-saving system 10 based on the collected data. Specifically, the data collected by the operating condition acquisition device 4 includes the vibration signal of the fan 6, the temperature signal of the fan, and the return water pressure, outlet water pressure, return water temperature, outlet water temperature, and cooling water flow rate of the circulating cooling water in the cooling tower.

[0039] In one embodiment, the operating condition acquisition device further includes a pressure sensor and a second transmitter disposed within a transmitter control box. The pressure sensor is configured to monitor the circulating cooling water pipeline pressure information in real time and transmit the monitored pipeline pressure information to the second transmitter, which then transmits the measured pipeline pressure information to the automatic control device in real time.

[0040] The working condition acquisition device also includes a flow meter, which is used to monitor the pipeline flow information of the circulating cooling water in real time and transmit the monitored pipeline flow information to the automatic control device in real time.

[0041] In an embodiment of the present application, when the automatic control device 1 determines that the vibration signal is greater than or equal to the preset vibration intensity, it is determined that the fan 6 is operating abnormally and needs to be stopped. The automatic control device 1 sends a stop command to the second motor, so that the fan 6 stops running in time; when the automatic control device 1 determines that the temperature signal is greater than or equal to the preset temperature, it is determined that the second motor is operating abnormally and needs to be stopped. The automatic control device 1 sends a stop command to the second motor, so that the second motor stops running in time; when the automatic control device 1 determines that the return water pressure is greater than or equal to the preset pressure, a control command to increase the opening of the upper tower valve is sent to the upper tower valve, so that the upper tower valve increases the opening; when the automatic control device 1 determines that the return water pressure is less than the preset pressure, a control command to reduce the opening of the upper tower valve is sent to the upper tower valve, so that the upper tower valve reduces the opening.

[0042] In an embodiment of the present application, the automatic control device 1 can also control the fan 6 and the water pump 2 to operate in different working states. For example, the working states include a first state, a second state, and a third state. Among them, the rotational speed of the fan and the rotational speed of the water pump are different in each state. The rotational speed of the fan 6 in the first state is greater than or equal to the rotational speed in the second state, and the rotational speed of the fan 6 in the second state is less than the rotational speed in the first state and greater than or equal to the rotational speed in the third state; at the same time, the rotational speed of the water pump 2 in the first state is greater than or equal to the rotational speed in the second state, and the rotational speed of the water pump 2 in the second state is less than the rotational speed in the first state and greater than or equal to the rotational speed in the third state. The fan 6 and the water pump 2 consume the most energy when working in the first state; the fan 6 and the water pump 2 are most energy-efficient when working in the third state; the energy consumption of the fan 6 and the water pump 2 is moderate when working in the second state.

[0043] In an embodiment of the present application, the rotational speed of the fan 6 and the water pump 2 when operating in the first state, the second state or the third state and the opening degree of the water pump 2 can be pre-set by the automatic control device 1 and solidified into specific parameters for the automatic operation of the industrial circulating cooling water energy-saving system 10.

[0044] In some embodiments, the operating state of the fan 6 and the water pump 2 can be set to multiple states, which is not limited in this application. For example, when the number of fans and water pumps in the industrial circulating cooling water energy-saving system 10 increases, five or seven operating states of the fans and water pumps can be set.

[0045] According to different requirements, in this embodiment, the control method of the automatic control device may include the following steps.

[0046] Step S1: receiving data collected by the working condition collection device 4, wherein the data collected by the working condition collection device 4 includes a vibration signal of the fan 6, a temperature signal of the second motor, a return water pressure, and a temperature of the circulating cooling water.

[0047] The operating condition collection device 4 includes a temperature sensor, a first transmitter, and a transmitter control box. The temperature sensor monitors the temperature of the circulating cooling water in real time and transmits the monitored temperature information to the transmitter, which then transmits the measured temperature information to the automatic control device in real time. The transmitter control box provides power to the operating condition collection device and provides on-site protection. The operating condition collection device also includes a vibration sensor and an instrument detection unit. The vibration sensor monitors the vibration signal of the fan, and the instrument detection unit detects the return water pressure. The operating condition collection device transmits the collected data to the automatic control device.

[0048] Step S2: Control the industrial circulating cooling water energy-saving system 10 according to the collected data.

[0049] Among them, when the automatic control device 1 determines that the vibration signal is greater than or equal to the preset vibration intensity, it is determined that the fan 6 is operating abnormally and the fan 6 needs to be stopped. The automatic control device 1 sends a stop command to the fan 6, so that the fan 6 stops running in time; when the automatic control device 1 determines that the temperature signal is greater than or equal to the preset temperature, it is determined that the second motor is operating abnormally and the second motor needs to be stopped. The automatic control device 1 sends a stop command to the second motor, so that the second motor stops running in time; when the automatic control device 1 determines that the return water pressure is greater than or equal to the preset pressure, it sends a control command to increase the opening of the upper tower valve to the upper tower valve, so that the upper tower valve increases the opening; when the automatic control device 1 determines that the return water pressure is less than the preset pressure, it sends a control command to reduce the opening of the upper tower valve to the upper tower valve, so that the upper tower valve reduces the opening.

[0050] Specifically, the automatic control device may include multiple functional modules composed of computer program segments. The computer program of each program segment in the automatic control device may be stored in a memory of a computer device and executed by at least one processor to perform the corresponding control function.

[0051] In one exemplary embodiment, the automatic control device can be divided into multiple functional modules based on the functions it performs. These functional modules may include a receiving module and a control module. A module, as referred to herein, refers to a series of computer program segments that can be executed by at least one processor and perform a fixed function, stored in a memory. In this embodiment, the automatic control device can be used to implement a control method for an industrial circulating cooling water energy-saving system.

[0052] The receiving module is used to receive data collected by the working condition collection device, wherein the data collected by the working condition collection device includes a vibration signal of the fan, a temperature signal of the second motor, a return water pressure, and a temperature of the circulating cooling water;

[0053] The control module is used to control the industrial circulating cooling water energy-saving system according to the collected data.

[0054] It is understood that the structures illustrated in the embodiments of the present application do not constitute a specific limitation on the automatic control device 1. In other embodiments of the present application, the automatic control device 1 may include more or fewer components than shown, or may combine or separate certain components, or may have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0055] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0056] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0057] In the embodiments provided in this application, it should be understood that the disclosed devices / terminal equipment and methods can be implemented in other ways. For example, the device / terminal equipment embodiments described above are merely illustrative. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0058] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. An industrial circulating cooling water energy-saving system, characterized in that: The system comprises a cooling tower, a water pump, a heat exchanger, a fan, a valve, a working condition acquisition device and an automatic control device, wherein the cooling tower, the water pump, the heat exchanger, the working condition acquisition device, the valve and the fan are connected in series in sequence through a closed-loop pipeline, the automatic control device is in communication with the water pump, the fan, the valve and the working condition acquisition device, the automatic control device receives data collected by the working condition acquisition device and controls the industrial circulating cooling water energy-saving system according to the collected data, wherein the data collected by the working condition acquisition device include the vibration signal of the fan, the temperature signal of the fan and the circulating cooling water in the cooling tower. The return water pressure, outlet water pressure, return water temperature, outlet water temperature, and cooling water flow rate are described. The automatic control device also controls the fan and the water pump to operate in different working states. The working condition acquisition device also includes an instrument detection unit. The instrument detection unit sends the detected return water pressure to the automatic control device. When the automatic control device determines that the return water pressure is greater than or equal to the preset pressure, a control instruction to increase the opening of the valve is sent to the valve to increase the valve opening; when the automatic control device determines that the return water pressure is less than the preset pressure, a control instruction to reduce the opening of the valve is sent to the valve to reduce the valve opening.

2. The industrial circulating cooling water energy-saving system according to claim 1, characterized in that: The valve includes an upper tower valve and a bypass valve, wherein the upper tower valve is an adjustable opening electric regulating valve, and the bypass valve is a switch valve. The automatic control device sends the control instruction of increasing / decreasing the valve opening to the upper tower valve.

3. The industrial circulating cooling water energy-saving system according to claim 1, characterized in that: The working state includes a first state, a second state and a third state. The speed of the fan in the first state is greater than or equal to the speed in the second state, and the speed of the fan in the second state is less than the speed in the first state and greater than or equal to the speed in the third state; at the same time, the speed of the water pump in the first state is greater than or equal to the speed in the second state, and the speed of the water pump in the second state is less than the speed in the first state and greater than or equal to the speed in the third state.

4. The industrial circulating cooling water energy-saving system according to claim 1, characterized in that: The water pump is an energy-saving variable water pump, which includes an impeller, a pump casing, a drive shaft, a first motor, inlet and outlet pipes and a hydraulic system. The impeller includes blades and a disk, the blades are mounted on the disk, and the disk is arranged on the drive shaft. One end of the drive shaft is connected to the output shaft of the first motor, and the other end is connected to the center of the impeller. The first motor drives the drive shaft to rotate to drive the impeller to rotate. The automatic control device receives the data collected by the working condition acquisition device and adjusts the hydraulic system according to the collected data to realize automatic control of the water pump.

5. The industrial circulating cooling water energy-saving system according to any one of claims 1 to 4, characterized in that: The fan is an energy-saving cooling fan, which includes a second motor, fan blades and a frequency conversion control cabinet. The second motor is a permanent magnet synchronous motor. The second motor is connected to the frequency conversion control cabinet. The frequency conversion control cabinet receives the instructions sent by the automatic control device and outputs them to the second motor, thereby driving the fan blades to rotate by controlling the rotation of the second motor.

6. The industrial circulating cooling water energy-saving system according to claim 5, characterized in that: The frequency conversion control cabinet includes a fan monitoring device and a second motor monitoring device, wherein the fan monitoring device is used to monitor the vibration signal of the fan in real time, and the second motor monitoring device is used to monitor the temperature signal of the second motor in real time; when the fan monitoring device detects the vibration signal of the fan, the vibration signal is sent to the automatic control device; When the second motor monitoring device monitors the temperature signal of the second motor, the temperature signal is sent to the automatic control device.

7. The industrial circulating cooling water energy-saving system according to claim 5, characterized in that: When the automatic control device determines that the temperature signal is greater than or equal to the preset temperature, a stop command is sent to the second motor so that the second motor stops running in time; when the automatic control device determines that the vibration signal is greater than or equal to the preset vibration intensity, a stop command is sent to the second motor so that the fan stops running in time.

8. The industrial circulating cooling water energy-saving system according to claim 1, characterized in that: The working condition acquisition device includes a temperature sensor, a transmitter and a transmitter control box. The temperature sensor is used to monitor the temperature information of the circulating cooling water in real time and send the monitored temperature information to the transmitter. The measured temperature information is transmitted to the automatic control device in real time through the transmitter.

9. The industrial circulating cooling water energy-saving system according to claim 1, characterized in that: The working condition acquisition device also includes a pressure sensor, a transmitter and a transmitter control box. The pressure sensor is used to monitor the pipeline pressure information of the circulating cooling water in real time, and send the monitored pipeline pressure information to the transmitter, and the measured pressure information is transmitted to the automatic control device in real time through the transmitter.

10. The industrial circulating cooling water energy-saving system according to claim 9, characterized in that: The working condition acquisition device also includes a flow meter, which is used to monitor the pipeline flow of circulating cooling water in real time and transmit the monitored pipeline flow information to the automatic control device in real time.

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