CN103940165B - Based on the control method of the control system for heat pump of DCS - Google Patents
Based on the control method of the control system for heat pump of DCS Download PDFInfo
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Abstract
Based on the control method of the control system for heat pump of DCS, relate to heat pump control technology field.It controls inconvenient to overcome existing control system for heat pump, the problem of poor reliability.The present invention Real-Time Monitoring physical quantity can have temperature, flow, liquid level and pressure, the temperature control signals that CPU controls according to the temperature monitored and receives calculates, to determine the duty of every platform heat pump, heat pump control signal is sent to heat pump by analog output unit and digital output card, realizes the automatic control to heat pump.The invention provides a kind of control mode than PLC control system more convenient and quicker, in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control procedure, have higher reliability.In addition, DCS system exploitation is easily, simple with configuration Soft-ware programme, easy to operate.The present invention is applicable to circulating cooling water of power plant waste heat recycling system.
Description
Technical field
The present invention relates to heat pump control technology field.
Background technology
Heat pump is as the capital equipment of circulating cooling water of power plant waste heat recycling system, existing heat pump controls all to adopt PLC carry out controlling to production process and monitor, because of PLC industrial technology and equipment characteristic, thermal technology personnel are difficult to modify optimization to control program, and cannot carry out safety-optimized operation according to power plant's actual operating state.Efficiency and the load of adjustment operation of heat pump need professional to operate at heat pump body control panel, and process problem not in time, and there is no communication and cooperation control between multiple stage heat pump.Heat pump monitors to there is not redundance unit as its running status of important production equipment and real-time parameter only by communication apparatus, this is extremely disadvantageous to power plant safety economical operation.
Summary of the invention
The object of the invention is to control inconvenient to overcome existing control system for heat pump, the problem of poor reliability, provides a kind of control method based on the control system for heat pump of DCS (scattered control system).
Control system for heat pump based on DCS of the present invention comprises human-computer interaction device, network communication system and distributed process control station;
Each control station in distributed process control station includes analog measurement circuit, On-off signal card, CPU, analog output unit and digital output card;
Described analog measurement circuit comprises analog signal input card and thermal resistance measurement card, described analog signal input card is for gathering steam flow, circulating water flow, drain trap liquid level and extraction pressure information, thermal resistance measurement card is used for collecting temperature information, and described temperature information comprises inlet temperature and outlet temperature, the inlet temperature of hot net water and the temperature of outlet temperature and low-pressure pumping steam of recirculated water;
The flow signal of described analog signal input card, liquid level signal and pressure signal are sent to CPU by I/O bus, the temperature signal of thermal resistance measurement card is sent to CPU by I/O bus, the Analog control signal of CPU is sent to the heat pump be made up of multiple stage heat pump by analog output unit, the discrete control signal of CPU is sent to heat pump by digital output card;
Described human-computer interaction device comprises engineer station, operator station, history station and operating office;
Described engineer station, operator station, history station and operating office all carry out data transmission by the CPU of network communication system and distributed process control station.
The control method of the control system for heat pump based on DCS of the present invention comprises the following steps:
Detecting step: for detecting the duty of each heat pump, hot net water outlet temperature, heating network entry temperature, circulating water outlet temperature, Inlet Temperature of Circulating Water, extraction temperature and drainage pump water level in real time, and receiving target temperature;
Calculation procedure: for calculating the actual total load of heat pump according to the duty of each heat pump, calculates target total load according to heat supply network outlet temperature, the target temperature that receives;
Target operating condition determining step: for determining the target operating condition of each heat pump according to the actual total load of heat pump and target total load;
Rate-determining steps: for sending state control signal to each heat pump.
The engineer station of the control system for heat pump based on DCS of the present invention is used for the logic control that realizes between equipment and changing display frame, operator station is used for the start and stop of remote control field apparatus, history station is used for recording all Monitoring Data, and operating office is used for realizing the information exchange based between the control system for heat pump of DCS and external system.The control system for heat pump based on DCS of EDPF-NT+ system configuration is utilized to achieve the Inspect and control of the information such as state and physical parameter to equipment each in control system for heat pump.Information in network communication system primary responsibility control procedure and data transmission.Distributed process control station is responsible for information gathering and data processing in heat pump technical process.In system, the collection of analog quantity information has been come by the analog signal input card in EDPF-NT+ system, the signal of telecommunication that the signals such as the pressure collected, flow, liquid level convert 4 ~ 20mA to is sent on analog signal input card by corresponding transmitter, and then analog signal input card converts the electrical signal to data signal and is sent in CPU.The resistance of thermal resistance measured by thermal resistance measurement card, and converts this resistance to data signal and be sent in CPU.The on off state collection of other each heat pump has then been come by On-off signal card, and input signal is dry contact signal.The signal collected is sent to the CPU process of the control system for heat pump based on DCS by I/O bus, and then CPU sends corresponding instruction to system.The output state setting of control system has then been come by analog output unit and digital output card, and output state sets the start and stop etc. of setting and each heat pump comprised each physical parameter in system.The physical quantity that this control system for heat pump is mainly monitored has: temperature, flow, liquid level and pressure.Main control loop then comprises temperature control loop and liquid level control loop.Much important monitoring point is had, such as: the entrance and exit temperature of the load of heat pump, the entrance and exit temperature of recirculated water, hot net water, lowly add the temperature and pressure etc. drawn gas in control system for heat pump.Analog quantity after calculating is sent to executing agency by analog output unit by CPU, makes executing agency produce the action of expection; Digital quantity is sent to executing agency by digital output card, respective execution mechanisms is opened or closed.Whole control procedure is produced a desired effect by collection, computing and execution three step.Above-mentioned control system can provide a kind of control mode than PLC control system more convenient and quicker, and in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control law, have higher reliability.In addition, the exploitation of DCS software section is easily, simple with configuration Soft-ware programme, easy to operate.The supervision to each process variable easily can be realized in heat pump, to temperature, flow, the control of the physical parameters such as liquid level.
The control method of the control system for heat pump based on DCS of the present invention, in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control procedure, have higher reliability.In addition, DCS system exploitation is easily, simple with configuration Soft-ware programme, easy to operate.The supervision to each process variable easily can be realized in heat pump, to temperature, flow, the control of the physical parameters such as liquid level.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the control system for heat pump based on DCS described in embodiment one;
Fig. 2 is the theory diagram of the distributed process control station in embodiment one;
Fig. 3 is the structural representation in the front, inside of switch board in embodiment one;
Fig. 4 is the structural representation at the back side, inside of switch board in embodiment one.
Detailed description of the invention
Detailed description of the invention one: composition graphs 1 to Fig. 4 illustrates present embodiment, the control system for heat pump based on DCS described in present embodiment comprises human-computer interaction device 1, network communication system 2 and distributed process control station 3;
Distributed process control station 3 comprises analog measurement circuit 3-1, On-off signal card 3-2, CPU3-3, analog output unit 3-4 and digital output card 3-5;
Described analog measurement circuit 3-1 comprises analog signal input card 3-1-1 and thermal resistance measurement card 3-1-2, described analog signal input card 3-1-1 is for gathering steam flow, circulating water flow, drain trap liquid level and extraction pressure information, thermal resistance measurement card 3-1-2 is used for collecting temperature information, and described temperature information comprises inlet temperature and outlet temperature, the inlet temperature of hot net water and the temperature of outlet temperature and low-pressure pumping steam of recirculated water;
The flow signal of described analog signal input card 3-1-1, liquid level signal and pressure signal are sent to CPU3-3 by I/O bus, the temperature signal of thermal resistance measurement card 3-1-2 is sent to CPU3-3 by I/O bus, the Analog control signal of CPU3-3 is sent to the heat pump be made up of multiple stage heat pump by analog output unit 3-4, the discrete control signal of CPU3-3 is sent to heat pump by digital output card 3-5;
Described human-computer interaction device 1 comprises engineer station 1-1, operator station 1-2, history station 1-3 and operating office 1-4;
Described engineer station 1-1, operator station 1-2, history station 1-3 and operating office 1-4 all carry out data transmission by the CPU3-3 of network communication system and distributed process control station 3.
DCS in present embodiment adopts EDPF-NT+ control system.For the technical process of this heat pump, and I/O counts, and we are for the DCS system hardware of heat pump configuration is as shown in following table 1 to table 4.
The hardware configuration at table 1 engineer station, operator station and history station
| Title | Model | Quantity |
| Industrial network switch | KIEN3016-2M, 2 light 16 electricity | 2 |
| Preset cable | 1 cover |
The hardware configuration of table 2 network communication system
| Title | Model | Quantity |
| SIS Interface Station computer | Duo double-core E5200/2.5GHz/2GRAM/500GB | 1 |
| Individual event isolation gateway | Peace is every Type B | 1 |
| Redundant network communication controller | 100M | 1 |
| LCD display | S22A300B | 1 |
The hardware configuration of table 3 distributed process control station
Table 4 other system equipment
| Title | Size | Quantity |
| Control rack | 800 wide × 2000 are high × and 600 dark | 2 |
| Expansion controls rack | 800 wide × 2000 are high × and 601 dark | 1 |
| Electric power network cabinet | 800 wide × 2000 are high × and 600 dark | 1 |
Engineer station 1-1 is used for the logic control that realizes between equipment and changing display frame, operator station 1-2 is used for the start and stop of remote control field apparatus, history station 1-3 is used for recording all Monitoring Data, and operating office 1-4 is used for realizing the information exchange based between the control system for heat pump of DCS and external system.
The control system for heat pump based on DCS of EDPF-NT+ system configuration is utilized to achieve the Inspect and control of the information such as state and physical parameter to equipment each in control system for heat pump.Information in network communication system 2 primary responsibility control procedure and data transmission.Distributed process control station 3 is responsible for information gathering and data processing in heat pump technical process.In system, the collection of analog quantity information has been come by the analog signal input card 3-1-1 in EDPF-NT+ system, its input signal received is the current signal of 4-20mA or the voltage signal of 1-5V, the collection of temperature has been come by thermal resistance measurement card 3-1-2, and input signal is resistance signal.The on off state collection of other each heat pump has then been come by On-off signal card 3-2, and input signal is dry contact signal.The signal collected is sent to the CPU3-3 process of the control system for heat pump based on DCS by I/O bus, and then CPU3-3 sends corresponding instruction to system.The output state setting of control system has then been come by analog output unit 3-4 and digital output card 3-5, and output state sets the start and stop etc. of setting and each heat pump comprised each physical parameter in system.The physical quantity that this control system for heat pump is mainly monitored has: temperature, flow, liquid level and pressure.Main control loop then comprises temperature control loop and liquid level control loop.Much important monitoring point is had, such as: the load of heat pump, the entrance and exit temperature of recirculated water, the entrance and exit temperature of hot net water, the temperature and pressure etc. of low-pressure pumping steam in control system for heat pump.Analog quantity after calculating is sent to executing agency by analog output unit 3-4 by CPU3-3, makes executing agency produce the action of expection; Digital quantity is sent to executing agency by digital output card 3-5, respective execution mechanisms is opened or closed.Whole control procedure is produced a desired effect by collection, computing and execution three step.
EDPF-NT scattered control system main performance index is as follows:
(1) Data highway communication network
Latticed form: rapid-exchange version EPA;
Communication standard: TCP/IP;
Communication speed: 100/1000Mb/s;
Network medium: optical fiber/UTP/STP;
Topological structure: star-like/ring-like/tree-shaped/bus-type, flattening peer-type network structure;
Communication network redundancy: two net concurrent redundancy/multiplex redundancy (ring network structure of multiple-spot detection redundancy fault-tolerant, self-cure type network structure);
Distributing real-time data bank total capacity > 65535 × 100 point;
Network data rate of load condensate: < 10%;
System network enabled nodes a: station, 100 territory × 253;
(2) distributed process control station 3
CPU3-3: low-power consumption Pentium500MHz;
Random access memory capacity: 256MB;
Non-volatile storage capacity: 256MB (ferroelectric memory);
Redundant fashion: hot backup redundancy;
The hard real-time kernel of operating system: LINUX;
Control treatment ability: 9999 control page/each DPU;
The fastest treatment cycle of system: 20ms;
Local real time data storage capacity≤16000 point/each DPU;
(3) I/O module
Analog input precision: be all better than 0.1%;
Environment temperature-20 DEG C ~ 65 DEG C humidity 10% ~ 95% (not condensing);
Local I/O and remote I/O completely compatible;
SOE resolution ratio≤1ms;
I/O module Electro Magnetic Compatibility: IEC-EMC certification;
(4) man-machine interface and interface
Screen resolution 1600 × 1280 or higher;
Picture refreshing time < 1s;
Picture data refresh time < 0.5s;
(5) reliability
Network multiple redundancy, DPU redundancy, power supply redundancy, important I/O redundancy;
MTBF > 200,000 hour;
Availability > 99.95%.
The control system for heat pump based on DCS described in present embodiment can provide a kind of control mode than PLC control system more convenient and quicker, the situation of change of each physical parameter in energy Real-Time Monitoring heat pump, more complicated control law can be realized, there is higher reliability.In addition, DCS system exploitation is easily, simple with configuration Soft-ware programme, easy to operate.The supervision to each process variable easily can be realized in heat pump, to temperature, flow, the control of the physical parameters such as liquid level.The more important thing is that DCS has better man-machine interface, friendly man-machine interface can make the work of engineer and operator more light.
Detailed description of the invention two: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described analog signal input card 3-1-1 is NT200-AI16.
Detailed description of the invention three: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described thermal resistance measurement card 3-1-2 is NT200-RTD16.
Detailed description of the invention four: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described On-off signal card 3-2 is NT200-DI16.
Detailed description of the invention five: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described analog output unit 3-4 is NT200-AO8.
Detailed description of the invention six: present embodiment is the further restriction to the control system for heat pump based on DCS described in embodiment one, in present embodiment, the model of described digital output card 3-5 is NT200-RB (AC/DC).
Detailed description of the invention seven: composition graphs 1 to Fig. 4 illustrates present embodiment, present embodiment is the control method of the control system for heat pump based on DCS described in embodiment one, said method comprising the steps of:
Detecting step: for detecting the duty of each heat pump, hot net water outlet temperature, heating network entry temperature, circulating water outlet temperature, Inlet Temperature of Circulating Water, extraction temperature and drainage pump water level in real time, and receiving target temperature;
Calculation procedure: for calculating the actual total load of heat pump according to the duty of each heat pump, calculates target total load according to heat supply network outlet temperature, the target temperature that receives;
Target operating condition determining step: for determining the target operating condition of each heat pump according to the actual total load of heat pump and target total load;
Rate-determining steps: for sending state control signal to each heat pump.
The control method Real-Time Monitoring heat supply network water inlet temperature of the control system for heat pump based on DCS described in present embodiment, outlet temperature T0 DEG C, circulating water intake temperature, outlet temperature and extraction pressure etc., when control system receive the outlet temperature of hot net water is adjusted to the order of T DEG C time, T0 and T compares by control system, the target total load of heat pump is determined according to the duty of T0 and T difference and each heat pump, the target operating condition of every platform heat pump is determined again according to target total load, and transmit control signal to every platform heat pump, make the actual total load of heat pump equal with target total load, and then make the outlet temperature of hot net water reach target temperature T DEG C.Other temperature detected in detecting step and water level signal are used for monitoring the duty of heat pump, and provide foundation for staff carries out debugging to system.
Now illustrate the control procedure of control system.Whole heat pump comprises 5 heat pumps, present heat pump total load is 55% (namely 75%, 2 heat pump full cut-ofves opened by 2 heat pump standard-sized sheets, 1 heat pump), hot net water inlet temperature 50 DEG C, outlet temperature 80 DEG C, circulating water intake temperature 60 C, outlet temperature 40 DEG C, extraction pressure 1.5MPa temperature 200 DEG C.Receive now heat supply network scheduling requirement and the outlet temperature of hot net water is brought up to 100 DEG C, after heat pump receives instruction, the analog signals hot net water outlet temperature 80 DEG C constantly gathered and order 100 DEG C are compared by process controller, find that standing state does not reach requirement, need the total load of heat pump to be brought up to 65% (i.e. 3 heat pump standard-sized sheets, 1 heat pump opens 25%, a heat pump full cut-off), pass through computing, utilize analog output module that the 3rd heat pump is opened into standard-sized sheet gradually, the 4th heat pump open command is given by switching value module, and by analog output module, the 4th heat pump is opened to 25%, the outlet temperature of hot net water reaches 100 DEG C, reach the requirement of heat supply network scheduling automatically.
The control method of the control system for heat pump based on DCS described in present embodiment, in energy Real-Time Monitoring heat pump, the situation of change of each physical parameter, can realize more complicated control procedure, have higher reliability.In addition, DCS system exploitation is easily, simple with configuration Soft-ware programme, easy to operate.The supervision to each process variable easily can be realized in heat pump, to temperature, flow, the control of the physical parameters such as liquid level.
Claims (6)
1., based on the control method of the control system for heat pump of DCS, described control system comprises human-computer interaction device (1), network communication system (2) and distributed process control station (3);
Each control station in distributed process control station (3) includes analog measurement circuit (3-1), On-off signal card (3-2), CPU (3-3), analog output unit (3-4) and digital output card (3-5);
Described analog measurement circuit (3-1) comprises analog signal input card (3-1-1) and thermal resistance measurement card (3-1-2), described analog signal input card (3-1-1) is for gathering steam flow, circulating water flow, drain trap liquid level and extraction pressure information, thermal resistance measurement card (3-1-2) is for collecting temperature information, and described temperature information comprises inlet temperature and outlet temperature, the inlet temperature of hot net water and the temperature of outlet temperature and low-pressure pumping steam of recirculated water;
The flow signal of described analog signal input card (3-1-1), liquid level signal and pressure signal are sent to CPU (3-3) by I/O bus, the temperature signal of thermal resistance measurement card (3-1-2) is sent to CPU (3-3) by I/O bus, the Analog control signal of CPU (3-3) is sent to by analog output unit (3-4) heat pump be made up of multiple stage heat pump, and the discrete control signal of CPU (3-3) is sent to heat pump by digital output card (3-5);
Described human-computer interaction device (1) comprises engineer station (1-1), operator station (1-2), history station (1-3) and operating office (1-4);
Described engineer station (1-1), operator station (1-2), history station (1-3) and operating office (1-4) all carry out data transmission by the CPU (3-3) of network communication system and distributed process control station (3);
It is characterized in that: said method comprising the steps of:
Detecting step: for detecting the duty of each heat pump, hot net water outlet temperature, heating network entry temperature, circulating water outlet temperature, Inlet Temperature of Circulating Water, extraction temperature and drainage pump water level in real time, and receiving target temperature;
Calculation procedure: for calculating the actual total load of heat pump according to the duty of each heat pump, calculates target total load according to heat supply network outlet temperature, the target temperature that receives;
Target operating condition determining step: for determining the target operating condition of each heat pump according to the actual total load of heat pump and target total load;
Rate-determining steps: for sending state control signal to each heat pump.
2. the control method of the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described analog signal input card (3-1-1) is NT200-AI16.
3. the control method of the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described thermal resistance measurement card (3-1-2) is NT200-RTD16.
4. the control method of the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described On-off signal card (3-2) is NT200-DI16.
5. the control method of the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described analog output unit (3-4) is NT200-AO8.
6. the control method of the control system for heat pump based on DCS according to claim 1, is characterized in that: the model of described digital output card (3-5) is NT200-RB.
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| CN104808562A (en) * | 2015-04-29 | 2015-07-29 | 深圳市三能新能源技术有限公司 | Internet+ distributed-type intelligent steam generator system |
| CN106595153B (en) * | 2016-12-16 | 2019-04-09 | 东莞市风火轮热能科技有限公司 | A kind of control method of the control system for heat pump based on PLC |
| CN118423909A (en) * | 2024-07-03 | 2024-08-02 | 陕西紫光新能科技股份有限公司 | Heat pump control system and control method |
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