CN220017504U - Automatic control device for heating of power plant with redundant measurement and control - Google Patents

Abstract

A redundant measurement and control automatic heating control device for a power plant belongs to the technical field of heating control of the power plant. The circuit breaker and the fuse power supply device, a signal processing-automatic control device with an Ethernet communication module, a touch operation display screen, a 1# frequency converter with built-in PID and Ethernet communication, a 1# alternating current contactor combination device, a 2# frequency converter with built-in PID and Ethernet communication, a 2# alternating current contactor combination device, a 1# frequency converter control display panel, a 2# frequency converter control display panel, an alternating current contactor-thermal relay combination device, a first temperature transmitter, a first pressure transmitter, a first electromagnetic flowmeter, a second temperature transmitter, a third temperature transmitter, a second pressure transmitter and a third pressure transmitter. The advantages are that: the motor operation is monitored in real time, the backwater temperature and the backwater pressure are controlled, and the safety and the reliability are realized.

Description

Automatic control device for heating of power plant with redundant measurement and control

Technical Field

The utility model belongs to the technical field of heating control of power plants, and particularly provides an automatic heating control device for a power plant, which is used for redundancy measurement and control. The heating control system can ensure that a user heats in winter, and the heating temperature of a room of the user reaches the optimal temperature of a human body, so that the heating process condition is monitored in real time, and the automatic intelligent optimization of the heating control mode is ensured.

Background

Heating is a life requirement necessary for residents living in winter in northern China or in frigid areas, and is a social service. Heating plays an important role in developing local economy, improving the living standard of people and improving the environment. The urban scattered heating has the problems of high energy consumption, large waste, serious environmental pollution and the like, and affects the healthy development of heating industry. Solves the contradiction and the problems existing in heating, and is an important work for guaranteeing the heating of residents in the area and realizing the requirement of building the saving type society. The thermal advantage of the power plant makes central heating a clean and guaranteed heating mode with higher safety performance.

As resident heating, the heating temperature must be ensured to reach the most suitable temperature of human body, and meanwhile, the control equipment works stably and intelligently.

Disclosure of Invention

The utility model aims to provide a redundant measurement and control automatic heating control device for a power plant, which solves the problems of high energy consumption, high waste, serious environmental pollution and the like. The control automation operation of the heating process is ensured. Through reasonable configuration and automatic control mode of the heating equipment, the faults of the measuring signals and the control equipment in the heating process can be automatically judged, the measuring signals are automatically corrected, and the equipment is automatically controlled to operate. If the heating circulation frequency converter or the motor and the water pump have faults in the heating process, the control system automatically switches the operation of the other redundant frequency converter, the motor and the water pump, so that normal automatic control operation is ensured, and meanwhile, the heating working condition is intelligently analyzed through the measuring signal, and the heating operation condition is monitored in real time. The rotation speed of the water pump is controlled by a PID intelligent controller arranged in the heating circulation frequency converter, so that the temperature of the water pump is stable and the heating temperature and the pressure are most suitable for a human body under any condition. The automatic control device is controlled by one key, and the whole process is automatically operated.

The utility model comprises a circuit breaker and fuse power supply device 1, a signal processing-automatic control device 2 with an embedded Ethernet communication module, a touch operation display screen 3, a 1# frequency converter 4 with built-in PID and Ethernet communication, a 1# alternating current contactor combination device 5, a 2# frequency converter 6 with built-in PID and Ethernet communication, a 2# alternating current contactor combination device 7, a 1# frequency converter control display panel 8, a 2# frequency converter control display panel 9, an alternating current contactor-thermal relay combination device 10, a first temperature transmitter 11, a first pressure transmitter 12, a first electromagnetic flowmeter 13, a second electromagnetic flowmeter 14, a second temperature transmitter 15, a third temperature transmitter 16, a second pressure transmitter 17 and a third pressure transmitter 18.

The breaker is connected with a five-wire system 3-phase 380V power supply, an N wire and a ground wire PE on the inlet wire side of the fuse power supply device 1, and the outlet wire side is connected with a signal processing-automatic control device 2 with an Ethernet communication module, a touch operation display screen 3, a 1# frequency converter 4 with built-in PID and Ethernet communication, a 2# frequency converter 6 with built-in PID and Ethernet communication, a 1# alternating current contactor combination device 5, a 2# alternating current contactor combination device 7 and an alternating current contactor-thermal relay combination device 10. The incoming line of the signal processing-automatic control device 2 with the built-in Ethernet communication module is connected with a first temperature transmitter 11, a first pressure transmitter 12, a first electromagnetic flowmeter 13, a second electromagnetic flowmeter 14, a second temperature transmitter 15, a third temperature transmitter 16, a second pressure transmitter 17 and a third pressure transmitter 18; the touch operation display screen 3 is connected with a built-in RS232 interface; the Ethernet interface is connected with a 1# frequency converter 4 with built-in PID and Ethernet communication and a 2# frequency converter 6 with built-in PID and Ethernet communication; is connected with the 1# alternating current contactor combination device 5, the 2# alternating current contactor combination device 7 and the alternating current contactor-thermal relay combination device 10. The output of the 1# frequency converter 4 with built-in PID and Ethernet communication is connected with the 1# alternating current contactor combination device 5. The output of the 2# frequency converter 6 with built-in PID and Ethernet communication is connected with the 2# alternating current contactor combination device 7. The 1# frequency converter 4 with built-in PID and Ethernet communication is connected with the 1# frequency converter control display panel 8 through an RJ485 interface. The 2# frequency converter 6 with built-in PID and Ethernet communication is connected with the 2# frequency converter control display panel 9 through an RJ485 interface. The 1# alternating current contactor combination device 5 is connected with the 1# heat circulation water pump motor 21 and the 1# heat circulation pipeline electric cut-off valve 34. The 2# alternating current contactor combination device 7 is connected with a 2# heat circulation water pump motor 22 and a 2# heat circulation pipeline electric cut-off valve 35. The alternating-current contactor-thermal relay combined device 10 is connected with a heating exchanger water delivery main pipeline electric valve 31, a backwater main pipeline electric valve 32, a heating pipeline water inlet softening water pump motor 23, a heating pipeline emergency drainage electric valve 36 and a heating pipeline emergency drainage motor 33.

The signal processing-automatic control device 2 with the built-in Ethernet communication module consists of a direct current 24V power supply, a CPU module with built-in Ethernet and 232 communication, a CPU bottom plate, a CPU lithium battery, an analog quantity and switching value module and an I/O module bottom plate; the direct current 24V power supply adopts one MW EDR-120-24, and the incoming line voltage is 100-240V AC output DC24V 5A; the CPU module is one of ABB PLC products PM585-ETH, built-in RS232/485 communication and Ethernet communication, and DC24V power supply; the CPU bottom plate is one of ABB TB 521-ETH; the analog module of the 16-path analog input is one of ABB PLC AI 532; the switching value input and output modules of the 8 paths of 24V switching value input and the 8 paths of relay output are ABB DX522 two; the I/O module bottom plate is ABB TU531 three, and CPU lithium cell is TA521 one.

The total of 8 paths of temperature, pressure and flow measurement signals enter an input analog quantity module; the motor frequency conversion control state signal, the electric valve state signal and the water pump state signal enter a switching value input module through a total 9 paths of a 1# alternating current contactor combination device 5, a 2# alternating current contactor combination device 7 and an alternating current contactor-thermal relay combination device 10; the control of the variable frequency contactor of the No. 1 motor, the control of the electric valve of the No. 1 motor, the control of the variable frequency contactor of the No. 2 motor, the control of the electric valve of the No. 2 motor, the control of the start-stop signal 2, the start-stop signal 5 of the main pipeline water outlet electric valve 31, the main pipeline backwater electric valve 32, the water inlet softening water pump motor 23 of the heating pipeline, the water outlet electric valve 36 of the heating pipeline and the water outlet water pump motor 33. The comprehensive combined signal of the pipeline backwater temperature signal and the pressure signal which are processed intelligently is communicated to the frequency converter by the Ethernet of the CPU module to be used as a feedback signal; the actual rotation speed of the motor, the current of the motor and various running and fault state signals of the frequency converter are fed back to the CPU module by the frequency converter through Ethernet communication. The signal processing-automatic control device 2 of the built-in Ethernet communication module displays the collected and given signals on the touch operation display screen 3 through Ethernet communication; the return water temperature and the return water pressure hope the setting value and the actual manual operation control button signal are transmitted to the signal processing-automatic control device 2 of the built-in Ethernet communication module through the built-in RS232 interface by touching the operation display screen 3, and then transmitted to the frequency converter through Ethernet. The signal processing-automatic control device 2 with the built-in Ethernet communication module controls the start-stop frequency converter through Ethernet communication, and gives out the frequency conversion of the main loop of the heating pipeline thermal cycle motor, the power frequency of the main loop of the softened water replenishing motor, the power frequency start-stop signals of the main loop of the pipeline drainage motor and the power frequency start-stop signals of the main loop of the electric valve motor through the switching value output module.

The utility model has the advantages that: the automatic processing and control of the measuring signals, the full-automatic operation of the equipment control, the automatic acquisition and judgment of fault information, the real-time display, the monitoring of the heating operation condition, the real-time monitoring of the motor operation control and state parameters, and the real-time adjustment and control of backwater temperature and pressure parameters. And the temperature and pressure of the return water of the pipeline are intelligently controlled and are stable. The control mode is optimal, and the redundancy is safe and reliable. The occurrence of the equipment stop operation condition caused by the faults of the measuring signal, the motor and the frequency converter can be eliminated. And energy is saved. The control system automatically operates, and the control process is safe and reliable.

Drawings

FIG. 1 is a schematic diagram of a power plant heating process flow for redundant measurement and control.

FIG. 2 is a schematic diagram of the overall structure of a redundant measurement and control automatic heating control device for a power plant.

In the figure: the circuit breaker and fuse power supply device 1, the signal processing-automatic control device 2 with built-in Ethernet communication module, the touch operation display screen 3, the 1# frequency converter 4 with built-in PID and Ethernet communication, the 1# alternating current contactor combination device 5, the 2# frequency converter 6 with built-in PID and Ethernet communication, the 2# alternating current contactor combination device 7, the 1# frequency converter control display panel 8, the 2# frequency converter control display panel 9, the alternating current contactor-thermal relay combination device 10, first temperature transmitter 11, first pressure transmitter 12, first electromagnetic flowmeter 13, second electromagnetic flowmeter 14, second temperature transmitter 15, third temperature transmitter 16, second pressure transmitter 17, third pressure transmitter 18, boiler 101, steam turbine 102, condenser unit 103, high-low water adding/draining unit 104, steam pipe inlet valve 105, heating exchanger vacuum pump unit 106, heating exchanger 107, steam pipe outlet valve 108, heating exchanger water draining unit 109, heating exchanger water draining unit outlet valve 110, 1# heat cycle pipe water pump driving motor 21, 2# heat cycle pipe water pump driving motor 22, softened water supply water pump driving motor 23, heat exchanger output main pipe electric valve 31, heat exchanger return water main pipe electric valve 32, heating pipe emergency water drain pump driving motor 33, 1# heat cycle pipe electric shut-off valve 34, 2# heat cycle pipe electric shut-off valve 35, heating pipe emergency water drain electric valve 36, heating pipe vacuum pump system 111, heating pipe emergency water drain pump 112, 1# heat cycle pipe check valve 113, 1# heat cycle water pump 114, 2# heat cycle pipe 115, 2# water pump 116, water cycle check valve 116, A drainage basin 120.

Detailed Description

The utility model comprises a circuit breaker and fuse power supply device 1, a signal processing-automatic control device 2 with an embedded Ethernet communication module, a touch operation display screen 3, a 1# frequency converter 4 with built-in PID and Ethernet communication, a 1# alternating current contactor combination device 5, a 2# frequency converter 6 with built-in PID and Ethernet communication, a 2# alternating current contactor combination device 7, a 1# frequency converter control display panel 8, a 2# frequency converter control display panel 9, an alternating current contactor-thermal relay combination device 10, a first temperature transmitter 11, a first pressure transmitter 12, a first electromagnetic flowmeter 13, a second electromagnetic flowmeter 14, a second temperature transmitter 15, a third temperature transmitter 16, a second pressure transmitter 17 and a third pressure transmitter 18.

The breaker is connected with a five-wire system 3-phase 380V power supply, an N wire and a ground wire PE on the inlet wire side of the fuse power supply device 1, and the outlet wire side is connected with a signal processing-automatic control device 2 with an Ethernet communication module, a touch operation display screen 3, a 1# frequency converter 4 with built-in PID and Ethernet communication, a 2# frequency converter 6 with built-in PID and Ethernet communication, a 1# alternating current contactor combination device 5, a 2# alternating current contactor combination device 7 and an alternating current contactor-thermal relay combination device 10. The incoming wires of the signal processing-automatic control device 2 with the built-in Ethernet communication module are connected with a first temperature transmitter 11, a first pressure transmitter 12, a first electromagnetic flowmeter 13, a second electromagnetic flowmeter 14, a second temperature transmitter 15, a third temperature transmitter 16, a second pressure transmitter 17 and a third pressure transmitter 18 through hard wires; the touch operation display screen 3 is connected with a built-in RS232 interface; the Ethernet interface is connected with a 1# frequency converter 5 with built-in PID and Ethernet communication and a 2# frequency converter 6 with built-in PID and Ethernet communication; is connected with the 1# alternating current contactor assembly 5, the 2# alternating current contactor assembly 7 and the alternating current contactor-thermal relay assembly 10 through hard wires. The output of the 1# frequency converter 4 with built-in PID and Ethernet communication is connected with the 1# alternating current contactor combination device 5 through a hard wire. The output of the 2# frequency converter 6 with built-in PID and Ethernet communication is connected with the 2# alternating current contactor combination device 7 through hard wires. The 1# frequency converter 4 with built-in PID and Ethernet communication is connected with the 1# frequency converter control display panel 8 through an RJ485 interface. The 2# frequency converter 6 with built-in PID and Ethernet communication is connected with the 2# frequency converter control display panel 9 through an RJ485 interface. The 1# alternating current contactor combination device 5 is connected with the 1# heat circulation water pump motor 21 and the 1# heat circulation pipeline electric cut-off valve 34. The 2# alternating current contactor combination device 7 is connected with a 2# heat circulation water pump motor 22 and a 2# heat circulation pipeline electric cut-off valve 35. The alternating-current contactor-thermal relay combined device 10 is connected with a heating exchanger water delivery main pipeline electric valve 31, a backwater main pipeline electric valve 32, a heating pipeline water inlet softening water pump motor 23, a heating pipeline emergency drainage electric valve 36 and a heating pipeline emergency drainage motor 33.

The utility model will be further described with reference to fig. 1 and 2.

Firstly, a power plant burns coal or gas through a boiler 101 to generate high-pressure saturated steam, the high-pressure saturated steam is sent into a steam turbine 102 through a pipeline, the high-pressure saturated steam continuously impacts a rotor of the steam turbine 102 at a high speed to rotate to drive a generator coaxial with the steam turbine 102 to generate power, the temperature of the steam after acting is continuously reduced, the steam is discharged from the lower part of the steam turbine 102 to enter a condenser device 103 to form condensed water, and then the water temperature, the water supplementing, the oxygen removing and the pressurizing are improved through a high-low water adding and draining device 104 and returned to the boiler 101. The heating steam is extracted from the middle section of the steam turbine 102 and is sent to the heating exchanger 107 through the valve 105, the temperature of the extracted high-pressure saturated steam is reduced after the heat exchange of the heating exchanger 107, the high-pressure saturated steam enters the heating exchanger drainage device 109 through the valve 108 and is sent back to the high-low-pressure drainage device 104 through the valve 110 to enter the boiler 101 for reuse. In the heat exchange process of the high-pressure saturated steam entering the heating exchanger 107, air is generated in the heat supply exchanger 107 due to the continuous change of the high and low water temperatures, so that the heat exchange efficiency is reduced, but the air can be automatically and continuously discharged through the vacuum pump device 106 of the exchanger, so that the heat exchange efficiency of the heat supply exchanger 107 is ensured.

Before the heat supply exchanger 107 starts to operate, the heating pipe is filled with softened water by the softened water supply water pump 118 and the softened water pipe check valve 117, so that the heating pipe is ensured to be filled with softened water.

In the normal heat supply process, the electric valve 31 of the main water supply pipeline of the heat supply exchanger 107 and the electric valve 32 of the main water return pipeline are opened, the electric shut-off valve 34 or 35 of the heat circulation pipeline is opened, the electric valve 36 of the emergency water discharge pipeline is closed, the motor 21 or 22 of the heat circulation water pump operates, the motor-driven water pump 114 or 116 operates along with the increase of the rotating speed, the increased water pressure automatically washes the check valve 113 or 115 of the heat circulation pipeline, water flows through the heat supply exchanger 107 to form heating water to enter a user end for heating the user, the water temperature of the heating water is reduced after the heat of the heating water is radiated through the user end, and the heating water is circulated into the heat supply exchanger 107 for heat exchange by the heat circulation water pump 114 or 116. The water has the characteristic of expend with heat and contract with cold, simultaneously because pipeline or user's problem probably have gas in pipeline heat supply water, and there is gas in the heating water to influence user's heating experience, and gaseous entering circulating pump forms the air lock easily simultaneously and leads to pump operating efficiency to descend, can automatic real-time exhaust aquatic gas through the heating pipeline vacuum pump system 111 of installing in the pipeline, guarantees heating efficiency. During the heating process, the problems of heating equipment and pipelines of users can be sudden, the water in the heating pipelines must be emptied, when the situation happens, the manual operation is performed to touch the operation display screen 3 to send out an instruction, the alternating current contactor-thermal relay combination device 10 sends out a signal to enable the emergency drainage electric valve 36 of the heating pipelines to be opened, the drainage water pump driving motor 23 is started, the drainage water pump 112 is operated, and the heating water is drained to the drainage tank 120; after the heating water is emptied and the problem is solved, the heating pipeline emergency drainage electric valve 36 is closed, and the drainage water pump 112 stops running.

The heating is to provide the user with the best body feeling, the heating temperature which is most suitable for life is high and low, and the body feeling of the user is not good. However, in the heating process, the temperature and pressure of the pipeline are unstable due to various reasons such as different temperatures and flows of high-pressure saturated steam of a power plant, objective environment, pipeline length and environmental temperature change, different problems and heat efficiency of user heating equipment, blockage and water leakage of a heating pipeline and the like, so that the user feel bad.

And a temperature transmitter, a pressure transmitter and an electromagnetic flowmeter are arranged at the inlet and outlet of the heat supply exchanger at the main pipe end. The pressure transmitter adopts a diffusion silicon sensor, so that the measurement accuracy is high, and two wires are connected; the temperature and electromagnetic flowmeter adopts four-wire system wiring, the site is provided with digital display, 4-20MA is output, the signal is connected to the signal processing-intelligent control device through a twisted pair shielding wire to carry out automatic processing judgment of a program, and faults existing in signal measurement are generally represented as broken wires, short circuits or maximum faults, unstable and large fluctuation, and deviate from a normal numerical range. The signal processing device calculates a signal value as an output signal by a digital filtering and arithmetic average method; redundant two sets of measurement are carried out on the temperature and pressure signals of the important water return pipeline, and if the two paths of measurement signals are normal, the program is processed by an arithmetic average method and then is used as final output; if one path of measurement signal fails, the signal processing device controller automatically takes the processed value of the other path of measurement signal as an output signal through digital filtering and arithmetic average. If the measured value fails, the processing device prompts the operator to replace or repair. Through signal processing, signals such as real-time heating backwater temperature, backwater pressure, instantaneous flow and accumulated flow are displayed and recorded on the touch operation display screen. The signal processing-intelligent control device uses the comprehensive temperature and pressure value as feedback signals to the frequency converter for PID control through Ethernet communication.

The signal processing-intelligent control device measures the flow of the water outlet and the backwater of the pipeline in real time, the flow is displayed and recorded on the touch operation display screen after the signal processing, whether the water leakage points exist on the pipeline and the user side can be judged through the difference value of the two flow, the two values are close under normal conditions, if the backwater flow is obviously smaller, the water leakage conditions appear, and the heating pipeline is prompted to be problematic. The signal processing-intelligent control device measures the water delivery temperature and the backwater temperature and the pressure of the pipeline heat exchanger in real time, the water delivery temperature and the backwater temperature and the pressure are displayed and recorded on the touch operation display screen after the signal processing, the temperature and the flow condition of the heat exchanger and the heat supply steam can be judged through the difference value of the two temperatures, the water outlet temperature is obviously higher than the backwater temperature under the normal condition of the water outlet pressure, and if the water outlet temperature is obviously smaller, the heat exchanger and the heat supply steam are represented, and the prompt is provided for solving the problem as soon as possible.

The water pump of the thermal circulation pipeline drives the frequency converter to communicate the state signal of the water pump to the signal processing-intelligent control device through Ethernet. When the water pump fails, the water pressure of the pipeline is obviously lower than the normal value; motor, cable and inverter faults all manifest as inverter faults. The signal processing-intelligent control device receives various state signals provided by the frequency converter through Ethernet communication for comprehensive analysis and processing, and judges that the equipment is in a normal or fault state. When the frequency converters are all normal, starting to operate according to a preset motor on the touch operation display screen by an operator, and performing hot standby on the other frequency converter; when the running frequency converter fails or the running frequency converter is at full rotation speed but the measured pipeline pressure is far lower than the normal set value and the duration exceeds 3 minutes, judging that the motor, the water pump or the frequency converter fails according to the measured pipeline pressure, sending a stopping signal of the frequency converter to the alternating current contactor combination device by the signal processing-intelligent control device, simultaneously, disconnecting the alternating current contactor and closing the electric pipeline cut-off valve, and judging whether the state is normal or not by feeding back the state of the alternating current contactor combination device to the signal processing-intelligent control device and displaying the state on the touch operation display screen. After the signal processing-intelligent control device judges that the shutdown is confirmed, a control signal is given to the alternating current contactor combination device to switch on the alternating current contactor, the electric cut-off valve of the pipeline is opened, and whether the state is normal is judged. After confirming the normal state, sending a starting signal to the frequency converter, and operating the frequency converter. The signal processing-intelligent control device monitors the running state and running time of the frequency converter in real time and displays the running state and the running time on the touch operation display screen in real time. When one frequency converter runs for a preset time in the touch operation display screen, the other frequency converter stops running and starts running of the other frequency converter under the condition that the other frequency converter determines no fault. If the other path of motor, water pump or frequency converter is in fault state, switching is not performed; the motor water pump regularly rotates and operates, so that the phenomena of dampness of a motor winding coil, rust of the water pump and the like can be prevented, and the motor and the water pump are ensured to be in a normal state all the time.

The operator controls the display disc to give the frequency converter program configuration through the frequency converter in advance, and the program configuration comprises parameters such as a motor, ethernet communication, PID control, motor start-stop, running direction, state of the frequency converter and the like.

The heating is to provide heating water with proper temperature and stable water pressure, and the condition of the heating temperature of the user side can be judged by measuring the return water temperature of the pipeline, and the condition is generally proportional to the heating temperature of the user side. The heating is to ensure the stable temperature of the backwater. The return water temperature of the pipeline and the return water pressure are in direct proportion, the water pressure is high, the flow is large, the flow velocity is large, and the temperature is high. The signal processing-intelligent control device provides two sets of control modes: and the heating backwater temperature control system and the backwater pressure control system. The operator selects in real time.

The PID control of the frequency converter is to compare the set value of the return water temperature of the pipeline or the return water pipeline pressure with the actual feedback value, and control the motor rotation speed through PID operation, when the return water temperature is low due to factors such as the bottom of the output hot water supply temperature of the heat exchanger, low ambient temperature, and the increase of user heating equipment, the output value of the PID controller becomes larger, the output of the frequency converter becomes larger, and the motor rotation speed is increased to increase the pipeline pressure and flow. The improvement of the return water temperature of the pipeline is matched with the set value of the return water temperature of the pipeline, and the rotation speeds of the motor and the water pump reach new dynamic balance. When the heat exchanger outputs hot water with high temperature, the user heating equipment reduces, the PID controller output value reduces, the frequency converter output is controlled to reduce, the motor rotation speed reduces the pipeline pressure and flow, the pipeline backwater temperature is matched with the pipeline backwater temperature setting value, and the motor and water pump rotation speed reaches new dynamic balance. The control system ensures that the heating quantity of the user is kept constant, and the normal heating sense and the comfortable heating temperature are ensured.

During normal operation, an operator firstly closes a breaker switch in the breaker and fuse power supply device, the signal processing-intelligent control device, the touch operation display screen, the frequency converter, the alternating current contactor combined device and the alternating current contactor-thermal relay combined device are electrified, the signal processing-intelligent control device and the frequency converter are initialized to operate by built-in programs, the Ethernet communication is normal, the measurement signal is normal, and the touch operation display screen normally displays the equipment state and gives a set value. The operator sets the desired backwater temperature and pressure value on the touch operation display screen in advance, various measuring ranges and difference range values, and the circulating operation time of the water pump is timed, and backwater temperature and pressure are controlled and selected. When the state display of the measurement signal and the control equipment is normal, the control button is touched by one key, and the control system intelligently detects the signal processing and the full automatic control operation of the equipment.

Claims (2)

1. The automatic heating control device for the power plant is characterized by comprising a circuit breaker and fuse power supply device (1), a signal processing-automatic control device (2) with an Ethernet communication module, a touch operation display screen (3), a 1# frequency converter (4) with built-in PID and Ethernet communication, a 1# alternating current contactor combination device (5), a 2# frequency converter (6) with built-in PID and Ethernet communication, a 2# alternating current contactor combination device (7), a 1# frequency converter control display disc (8), a 2# frequency converter control display disc (9), an alternating current contactor-thermal relay combination device (10), a first temperature transmitter (11), a first pressure transmitter (12), a first electromagnetic flowmeter (13), a second electromagnetic flowmeter (14), a second temperature transmitter (15), a third temperature transmitter (16), a second pressure transmitter (17) and a third pressure transmitter (18);

the circuit breaker is connected with a five-wire 3-phase 380V power supply, an N wire and a ground wire PE on the inlet wire side of a fuse power supply device (1), and the outlet wire side is connected with a signal processing-automatic control device (2) with an Ethernet communication module, a touch operation display screen (3), a 1# frequency converter (4) with built-in PID and Ethernet communication, a 2# frequency converter (6) with built-in PID and Ethernet communication, a 1# alternating current contactor combination device (5), a 2# alternating current contactor combination device (7) and an alternating current contactor-thermal relay combination device (10); the incoming line of the signal processing-automatic control device (2) with the built-in Ethernet communication module is connected with a first temperature transmitter (11), a first pressure transmitter (12), a first electromagnetic flowmeter (13), a second electromagnetic flowmeter (14), a second temperature transmitter (15), a third temperature transmitter (16), a second pressure transmitter (17) and a third pressure transmitter (18); the touch operation display screen (3) is connected with the built-in RS232 interface; the Ethernet interface is connected with a 1# frequency converter (4) with built-in PID and Ethernet communication and a 2# frequency converter (6) with built-in PID and Ethernet communication; is connected with a 1# alternating current contactor combination device (5), a 2# alternating current contactor combination device (7) and an alternating current contactor-thermal relay combination device (10); the output of a 1# frequency converter (4) with built-in PID and Ethernet communication is connected with a 1# alternating current contactor combination device (5); the output of a 2# frequency converter (6) with built-in PID and Ethernet communication is connected with a 2# alternating current contactor combination device (7); the 1# frequency converter (4) with built-in PID and Ethernet communication is connected with the 1# frequency converter control display panel (8) through an RJ485 interface; the 2# frequency converter (6) with built-in PID and Ethernet communication is connected with a 2# frequency converter control display panel (9) through an RJ485 interface; the 1# alternating current contactor combination device (5) is connected with a 1# heat circulation water pump motor (21) and a 1# heat circulation pipeline electric cut-off valve (34); the 2# alternating current contactor combination device (7) is connected with a 2# heat circulating water pump motor (22) and a 2# heat circulating pipeline electric cut-off valve (35); the alternating-current contactor-thermal relay combined device (10) is connected with a heating exchanger water delivery main pipeline electric valve (31), a water return main pipeline electric valve (32), a heating pipeline water inlet softening water pump motor (23), a heating pipeline emergency drainage electric valve (36) and a heating pipeline emergency drainage motor (33).

2. The redundancy measurement and control automatic heating control device for a power plant according to claim 1, wherein the signal processing-automatic control device (2) with the built-in Ethernet communication module is composed of a direct current 24V power supply, a CPU module with built-in Ethernet and 232 communication, a CPU bottom board, a CPU lithium battery, an analog quantity and switching quantity module and an I/O module bottom board; the direct current 24V power supply adopts one MW EDR-120-24, and the incoming line voltage is 100-240V AC output DC24V 5A; the CPU module is one of ABB PLC products PM585-ETH, built-in RS232/485 communication and Ethernet communication, and DC24V power supply; the CPU bottom plate is one of ABB TB 521-ETH; the analog module of the 16-path analog input is one of ABB PLC AI 532; the switching value input and output modules of the 8 paths of 24V switching value input and the 8 paths of relay output are ABB DX522 two; the I/O module bottom plate is ABB TU531 three, and CPU lithium cell is TA521 one.