CN213577745U - Automatic control system of central heating heat exchange station - Google Patents
Automatic control system of central heating heat exchange station Download PDFInfo
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Abstract
The utility model belongs to the technical field of heat exchange station control systems, in particular to an automatic control system of a central heating heat exchange station, which consists of a primary heating network circulating system, a secondary heating network circulating system, a data acquisition processing module and an automatic control module; the data acquisition and processing module consists of a temperature and flow conversion unit and 2 subtracters; the automatic control module consists of a subtracter, a change-over switch and 2 PID controllers; the established automatic control system of the heat exchange station realizes the automatic switching of the feedforward-feedback control quantity regulation and the feedback control quality regulation of the secondary side heat network through the change-over switch according to the weather change, realizes the automatic control of the constant temperature difference of the supply water and the return water of the secondary side heat network of the heat exchange station through the PID controller, keeps the heat supply quantity matched with the heat supply load, ensures the thermal balance of the heat network, and realizes the economical and reliable operation of the heat exchange station.
Description
Technical Field
The utility model belongs to the technical field of heat transfer station control system, concretely relates to central heating heat transfer station automatic control system.
Background
The heat exchange station is a hub and a core of a central heating system and is a bridge and a link for connecting a heat source and a heat user. The heat exchange station control system has the main task of timely adjusting the running state of the heat exchange station according to the change condition of the heat load, meeting the heat utilization requirement of a user and ensuring that the indoor temperature of the heat user is kept within a certain range.
In order to make up for a series of heating quality problems such as local overheating, local non-heating and vertical heating power imbalance in a heating area caused by hydraulic imbalance in the past, a heat exchange station usually adopts a large-flow small-temperature-difference operation mode, so that the heating system is low in efficiency and high in heating energy consumption. At present, a heat exchange station is basically provided with an automatic control system, but most of the heat exchange stations still rely on experience of operators to manually set various adjusting parameters, and when temperature fluctuation is variable due to abnormal climate change, the phenomenon that the heating load is not matched with the demand of a heat user still exists widely.
Therefore, on the premise of ensuring the comfort of heat users, the operation of the heat exchange station is scientifically and reasonably regulated and controlled, the heat supply efficiency can be effectively improved, the energy consumption of a heat supply system is reduced, the energy waste is reduced, and the heat exchange station has great economic value and social benefit.
SUMMERY OF THE UTILITY MODEL
The utility model provides an automatic control system of a central heating heat exchange station, which comprises a heat supply network primary side circulating system, a heat supply network secondary side circulating system, a data acquisition processing module and an automatic control module; the data acquisition processing module consists of an air temperature and flow conversion unit and 2 subtracters; the automatic control module consists of a subtracter, an adder, a change-over switch and 2 PID controllers.
In the heat supply network primary side circulating system, high-temperature hot water provided by a heat source is conveyed to the heat exchange station through a heat supply network primary side water supply pipeline, and an electric regulating valve is arranged on the heat supply network primary side water supply pipeline and can change the flow of the high-temperature hot water in the heat supply network primary side water supply pipeline; in the heat exchange station, high-temperature hot water conveyed by a primary side water supply pipeline of the heat supply network enters the plate type heat exchanger and exchanges heat with circulating water at a secondary side of the heat supply network in the plate type heat exchanger, and cooled primary side return water of the heat supply network returns to a heat source through a primary side circulating water pump arranged on a primary side return water pipeline of the heat supply network.
The heat supply network secondary side circulating system is characterized in that after the heat supply network secondary side circulating water absorbs heat in the plate type heat exchanger, the heat is transmitted to a heat user through a heat supply network secondary side water supply pipeline from an outlet of the plate type heat exchanger, and a temperature sensor and a pressure sensor are arranged on the heat supply network secondary side water supply pipeline and used for measuring the temperature and the pressure of the circulating water in the water supply pipeline; the cooled backwater returns to the plate heat exchanger through a secondary side circulating water pump arranged on a secondary side backwater pipeline of the heat supply network, and a temperature sensor and a pressure sensor are arranged on the secondary side backwater pipeline of the heat supply network and used for measuring the temperature and the pressure of the circulating water in the backwater pipeline.
The data acquisition and processing module is used for acquiring temperature and pressure signals of water supply and return of the secondary side of the heat supply network and outdoor atmospheric temperature and wind speed information in real time and acquiring the temperature and pressure signals, the outdoor atmospheric temperature and the wind speed information from a weather forecast by connecting the internet; temperature sensors on a water supply pipeline and a water return pipeline on the secondary side of the heat supply network are connected to a first subtracter to obtain a temperature difference signal delta t of supply and return water on the secondary side; pressure sensors on a water supply pipeline and a water return pipeline on the secondary side of the heat supply network are connected to a second subtracter to obtain a differential pressure signal delta p of supply and return water on the secondary side; outdoor atmospheric temperature and wind speed information are connected to the air temperature and flow conversion unit, and the flow of a secondary side circulation loop of a heat supply network required by meeting the heat supply load of a heat user is obtained and used as the regulating quantity of a feedforward loop for regulating and controlling the system quantity of the heat exchange station; the outputs OUT1, OUT2, and OUT3 of the data acquisition and processing modules are connected to the automation control modules IN1, IN2, and IN3, respectively.
The automatic control module is connected with a third subtracter together with a secondary side water supply and return temperature difference signal delta t output by the data acquisition module and a secondary side water supply and return temperature difference set value of the heat supply network to obtain an automatic feedback control deviation signal Error; a secondary side water supply and return pressure difference signal delta p output by the data acquisition module is connected to a change-over switch, when the secondary side water supply and return pressure difference signal delta p is within a normal value range, the output end OUT4 of the change-over switch is connected with the input end of a first PID controller, the output of the first PID controller is connected to a frequency converter through an adder, and the output of the frequency converter is connected with a secondary side circulating water pump, so that the quantity regulation control of a heat exchange station system is realized; when the secondary side water supply and return pressure difference signal delta p reaches the upper limit value or the lower limit value, the output end OUT5 of the change-over switch is connected with the input end of the second PID controller, and the output end of the second PID controller is connected to the heat supply network primary side electric regulating valve, so that the quality regulation control of the heat exchange station system is realized.
The utility model provides a pair of central heating heat exchange station automatic control system, through gathering meteorological parameter in the weather forecast, fluid pressure, analog parameter such as fluid temperature, analog parameter to these real-time collections carries out the analysis processes back, realize the automatic switch-over of heat supply network secondary side feedforward-feedback control volume regulation and feedback control quality regulation through change over switch according to weather variation, the heat supply network secondary side that realizes the heat exchange station through the PID controller supplies the poor automatic control of return water constant temperature, guarantee the thermodynamic balance of heat supply network, realize heat exchange station economic reliable operation.
The system has the following characteristics: 1. the heat exchange station system runs at a constant temperature difference of supply and return water, and the flow of the heat supply system is adjusted by a variable-frequency circulating water pump to achieve the purpose of energy conservation; 2. the weather forecast information is used as feedforward control to pre-adjust a heat supply system of the heat exchange station, so that the heat supply amount is adjusted in advance, and the influence of large inertia and large lag of the heat supply system on the comfort of a heat user is reduced; 3. the feedback control is adopted to realize the constant temperature difference operation of the supply water and the return water of the secondary side of the heat supply network, thereby improving the heat supply efficiency and reducing the energy waste; 4. under the extreme weather condition, in order to ensure the heating quality of a heat user, the automatic control system of the heat exchange station is switched from the quantity regulation control mode to the quality regulation control mode according to the pressure difference of supply water and return water, and resources are reasonably utilized.
Drawings
FIG. 1 is a schematic diagram of a control system of a heat exchange station;
FIG. 2 is a partial schematic view of a data acquisition processing module;
FIG. 3 is a partial schematic view of an automated control module;
fig. 4 is a block diagram of the automatic control operation of the heat exchange station.
Detailed Description
The utility model provides an automatic control system of a central heating heat exchange station, as shown in figure 1, the control system is composed of a heat supply network primary side circulation system, a heat supply network secondary side circulation system, a data acquisition processing module and an automatic control module; the data acquisition processing module consists of an air temperature and flow conversion unit and 2 subtracters; the automatic control module consists of a subtracter, an adder, a change-over switch and 2 PID controllers.
In the heat supply network primary side circulating system, high-temperature hot water provided by a heat source is conveyed to the heat exchange station through a heat supply network primary side water supply pipeline, and an electric regulating valve is arranged on the heat supply network primary side water supply pipeline and can change the flow of the high-temperature hot water in the heat supply network primary side water supply pipeline; in the heat exchange station, high-temperature hot water conveyed by a primary side water supply pipeline of the heat supply network enters the plate type heat exchanger, heat exchange is carried out between the high-temperature hot water and circulating water of a secondary side of the heat supply network in the plate type heat exchanger, and cooled primary side return water of the heat supply network returns to a heat source through a primary side circulating water pump arranged on a primary side return water pipeline of the heat supply network.
The heat supply network secondary side circulating system is characterized in that after the heat supply network secondary side circulating water absorbs heat in the plate type heat exchanger, the heat is transmitted to a heat user through a heat supply network secondary side water supply pipeline from an outlet of the plate type heat exchanger, and a temperature sensor and a pressure sensor are arranged on the heat supply network secondary side water supply pipeline and used for measuring the temperature and the pressure of the circulating water in the water supply pipeline; the cooled backwater returns to the plate heat exchanger through a secondary side circulating water pump arranged on a secondary side backwater pipeline of the heat supply network, and a temperature sensor and a pressure sensor are arranged on the secondary side backwater pipeline of the heat supply network and used for measuring the temperature and the pressure of the circulating water in the backwater pipeline.
The data acquisition and processing module is used for acquiring temperature and pressure signals of secondary side water supply and return water of a heat supply network, outdoor atmospheric temperature and outdoor air speed information in real time and acquiring the temperature and pressure signals and the outdoor atmospheric temperature and the outdoor air speed information from weather forecast through connecting the internet as shown in figure 2; temperature sensors on a water supply pipeline and a water return pipeline on the secondary side of the heat supply network are connected with a first subtracter, and a water supply and return temperature difference signal delta t is obtained and is connected with an output end OUT1 of the data acquisition and processing module; and pressure sensors on a water supply pipeline and a water return pipeline on the secondary side of the heat supply network are connected with a second subtracter, and a water supply and return pressure difference signal delta p is obtained and is connected with an output end OUT2 of the data acquisition and processing module. The outdoor atmospheric temperature and wind speed information is connected with the input end of the air temperature and flow conversion unit, and the output end of the air temperature and flow conversion unit is connected with the output end OUT3 of the data acquisition and processing module.
As shown IN fig. 3, the output end OUT1 of the data acquisition module of the automatic control module is connected with the input end IN1 of the automatic control module, the output end OUT2 of the data acquisition module is connected with the input end IN2 of the automatic control module, and the output end OUT3 of the data acquisition module is connected with the input end IN3 of the automatic control module; the input end IN2 of the automatic control module and a temperature difference set value of supply and return water on the secondary side of the heat supply network are connected to a third subtracter; the output end of the third subtracter and the input end IN3 of the automatic control module are connected together to a change-over switch, the output end OUT4 of the change-over switch is connected with the input end of the first PID controller, the output end of the first PID controller and the input end IN1 of the automatic control module are connected together to an adder, the output end of the adder is connected to the output end OUT6 of the automatic control module, the output end OUT6 of the automatic control module is connected to a frequency converter, and the output of the frequency converter is connected with the secondary side circulating water pump; the output end OUT5 of the change-over switch is connected with the input end of the second PID controller, and the output end of the second PID controller is connected with the output end OUT7 of the automatic control module; the output end OUT7 of the automatic control module is connected with the electric regulating valve on the primary side of the heat supply network.
The utility model provides a central heating heat exchange station automatic control system, as shown in figure 4, through gathering analog parameter such as meteorological parameter, fluid pressure, fluid temperature in the weather forecast, carry out the analysis processes back to these analog parameter of gathering in real time, realize the automatic switch of heat supply network secondary side feedforward-feedback control volume regulation and feedback control quality control through change over switch according to weather change, the heat supply network secondary side that realizes the heat exchange station through the PID controller supplies the poor automatic control of return water constant temperature, concrete step includes:
quantity control of a heat exchange station system
1. Feed forward control
Because the heat supply heat source, the heat supply pipe network and the building have great thermal inertia, the influence of the change of the heat supply parameters such as meteorological parameters, water supply temperature, water supply flow and the like on the room temperature of a heat user has long lag time, and in order to ensure the design requirement of the room temperature of the heat user, the operation of the heat supply pipe network is regulated by considering pre-regulation, namely, the change of a regulation scheme has a reasonable time difference relative to the change of the room temperature, the heat supply load is predicted according to meteorological forecast information, the operation working condition of a heat exchange station is regulated timely and reasonably, the system optimization scheduling is realized, the lag time of the heat supply pipe network is reduced, the heating quality is ensured, and the.
The weather parameters are the basis for designing and adjusting the whole centralized heating system, the main weather parameters influencing the heat load of the building and the operation adjusting strategy of the heating system comprise outdoor atmospheric temperature, wind speed and the like, the forecasting accuracy is steadily improved along with the continuous development of weather forecasting technology, weather forecasting information service based on the internet technology is gradually improved, and the outdoor atmospheric temperature is corrected by adopting the wind speed information in weather forecasting to obtain the outdoor comprehensive temperature.
Under the working condition of constant temperature difference of water supply and return on the secondary side of the heat supply network, when the outdoor comprehensive temperature changes, the heat supply load and the heat load are balanced, and the energy conservation is realized by only adjusting the secondary side circulation flow of the heat supply network, namely changing the flow regulation method of the secondary side circulation water pump through frequency conversion regulation.
Outdoor atmospheric temperature and air speed information IN weather forecast is connected to a data acquisition processing module, is connected to an automatic control module IN1 through an output end OUT1 of the data acquisition processing module after being converted by an air temperature and flow conversion unit, is connected to a frequency converter through an output end OUT6 of the automatic control module through an adder, is used as feedforward control IN a secondary side circulating water pump control loop, adjusts the output frequency of the frequency converter, and further changes the circulating flow of the secondary side of a heat supply network; the secondary side of the heat supply network is adjusted in advance through meteorological parameters in weather forecast, so that the comfort of the indoor environment of a heat user caused by the lagging performance of a heat supply system can be effectively reduced.
2. Feedback control
When weather forecast information is inconsistent with actual meteorological parameters, coarse adjustment through feedforward control is carried OUT, the temperature difference of supply return water of the secondary side of the heat supply network is changed, deviation Error is generated by the temperature difference set value of the supply return water, the deviation Error is connected to the input end of a change-over switch, the output end OUT4 of the change-over switch is connected to the input end of a first PID controller, after proportional P, integral I and differential D operation, the output of the first PID controller passes through an adder, the output end OUT6 of an automatic control module is connected to a frequency converter, the output frequency of the frequency converter is changed, the circulating flow of the secondary side of the heat supply network is adjusted, the deviation Error is eliminated, and finally the temperature difference of the supply return water of the secondary side of the heat supply.
When the working condition of the primary side of the heat supply network changes or is disturbed, the water supply temperature of the primary side of the heat supply network changes, the water supply temperature of the secondary side of the heat supply network also changes, and further the water supply and return temperature difference of the secondary side of the heat supply network changes, the deviation Error generated by the water supply and return temperature difference and the set value of the secondary side of the heat supply network is connected to the input end of the change-over switch, the output end OUT4 of the change-over switch enters the first PID controller, after the operation of proportion P, integral I and differential D, the output of the first PID controller passes through the adder, the output end OUT6 of the automatic control module is connected to the frequency converter, the output frequency of the frequency converter is changed, and further the flow of the circulating water pump of the secondary side of the heat supply.
Quality control of heat exchange station system
When weather appears unusually in the season of heating, the upper and lower limit value that heat supply network secondary side supply return water pressure differential reached, the volume control mode through adjusting secondary side circulating water pump flow will not satisfy hot user's heating demand, for guaranteeing not appearing heating system heating power maladjustment's problem, through change over switch, with volume regulation control circuit switching to matter regulation control circuit, through adjusting the aperture of heat supply network once side electric control valve, change heat supply network once side supply return water flow, and then change the fluid temperature of secondary side supply channel, the heat supply that adjustment heat exchange station carried for hot user.
In the initial cold period or the final cold period, when the outdoor temperature is higher, the circulation flow of the secondary side of the heat supply network is smaller, and the pressure difference of the water supply and return pipeline of the secondary side of the heat supply network reaches the lower limit set value, the secondary side circulating water pump keeps a certain rotating speed unchanged, the change-over switch acts, the automatic control of the heat exchange station system is converted from quantity regulation into quality regulation, the deviation Error between the temperature difference measured value of the heat supply and return pipeline on the secondary side of the heat supply network and the temperature difference set value of the heat supply and return pipeline on the secondary side of the heat supply network is connected to the input end of the change-over switch, the output end OUT5 of the change-over switch is connected to the second PID controller, after the operations of proportion P, integral I and differential D, the output of second PID controller is connected to heat supply network once and inclines supply line electric control valve, reduces heat supply network once and inclines electric control valve opening, reduces heat supply network secondary side water supply temperature, guarantees the heat supply load that the heat transfer station carried and the heating heat load's of heat consumer balance.
In severe cold period, when outdoor temperature is lower, the secondary side circulating water pump reaches rated rotating speed, the actual measured value of the temperature difference of water supply and return of the secondary side of the heat supply network is still lower than a set value, the heat supply quantity conveyed by the heat exchange station cannot meet the heating heat load of a heat user, the pressure difference of the water supply and return pipeline of the secondary side of the heat supply network reaches an upper limit set value, the action of the change-over switch is carried OUT, the automatic control system of the heat exchanger is switched to quality regulation control, the deviation Error between the measured value of the temperature difference of the water supply and return pipeline of the secondary side of the heat supply network and the temperature difference set value of the water supply and return pipeline of the secondary side of the heat, the output of second PID controller is connected to heat supply network and once inclines supply line electric control valve, and increase heat supply network once inclines electric control valve opening, improves heat supply network secondary side water supply temperature, guarantees the heat supply load that the heat transfer station carried and the heating heat load's of heat consumer balance.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (1)
1. An automatic control system of a central heating heat exchange station comprises a heat supply network primary side circulating system, a heat supply network secondary side circulating system, a data acquisition processing module and an automatic control module; the data acquisition processing module consists of an air temperature and flow conversion unit and 2 subtracters; the automatic control module consists of a subtracter, an adder, a change-over switch and 2 PID controllers;
the heat supply network primary side circulating system is characterized in that a heat source outlet is connected with an inlet of an electric regulating valve through a heat supply network primary side water supply pipeline, an outlet of the electric regulating valve is connected with a hot end inlet of a plate type heat exchanger through the heat supply network primary side water supply pipeline, an outlet of the hot end of the plate type heat exchanger is connected with an inlet of a heat supply network primary side circulating water pump through a heat supply network primary side water return pipeline, and an outlet of the heat supply network primary side circulating water pump is connected with the heat source;
in the heat supply network secondary side circulating system, a cold end outlet of the plate type heat exchanger is connected with a heat user inlet through a heat supply network secondary side water supply pipeline, the heat user outlet is connected to a heat supply network secondary side circulating water pump inlet through a heat supply network secondary side water return pipeline, and a heat supply network secondary side circulating water pump outlet is connected with the cold end inlet of the plate type heat exchanger through a heat supply network secondary side water return pipeline; a temperature sensor and a pressure sensor are arranged on a secondary side water supply pipeline of the heat supply network and used for measuring the temperature and the pressure of circulating water in the water supply pipeline; a temperature sensor and a pressure sensor are arranged on a secondary side water return pipeline of the heat supply network and are used for measuring the temperature and the pressure of circulating water in the water return pipeline;
the data acquisition and processing module is used for acquiring temperature and pressure signals of water supply and return of the secondary side of the heat supply network and outdoor atmospheric temperature and wind speed information in real time and acquiring the temperature and pressure signals, the outdoor atmospheric temperature and the wind speed information from a weather forecast by connecting the internet; temperature sensors on a water supply pipeline and a water return pipeline on the secondary side of the heat supply network are connected with a first subtracter, and a water supply and return temperature difference signal delta t is obtained and is connected with an output end OUT1 of the data acquisition and processing module; pressure sensors on a water supply pipeline and a water return pipeline on the secondary side of the heat supply network are connected with a second subtracter, and a water supply and return differential pressure signal delta p is obtained and is connected with an output end OUT2 of the data acquisition and processing module; the outdoor atmospheric temperature and wind speed information is connected with the input end of the air temperature and flow conversion unit, and the output end of the air temperature and flow conversion unit is connected with the output end OUT3 of the data acquisition and processing module; the output end OUT1 of the data acquisition module is connected with the input end IN1 of the automatic control module, the output end OUT2 of the data acquisition module is connected with the input end IN2 of the automatic control module, and the output end OUT3 of the data acquisition module is connected with the input end IN3 of the automatic control module;
the input end IN2 of the automatic control module and a temperature difference set value of supply and return water on the secondary side of the heat supply network are connected to a third subtracter; the output end of the third subtracter and the input end IN3 of the automatic control module are connected together to a change-over switch, the output end OUT4 of the change-over switch is connected with the input end of the first PID controller, the output end of the first PID controller and the input end IN1 of the automatic control module are connected together to an adder, the output end of the adder is connected to the output end OUT6 of the automatic control module, the output end OUT6 of the automatic control module is connected to a frequency converter, and the output of the frequency converter is connected with the secondary side circulating water pump; the output end OUT5 of the change-over switch is connected with the input end of the second PID controller, and the output end of the second PID controller is connected with the output end OUT7 of the automatic control module; the output end OUT7 of the automatic control module is connected with the electric regulating valve on the primary side of the heat supply network.
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| CN113701234A (en) * | 2021-08-31 | 2021-11-26 | 哈尔滨天达控制股份有限公司 | Intelligent control method, device and system for heat supply secondary network |
| CN114151842A (en) * | 2021-11-25 | 2022-03-08 | 中节能（贵州）建筑能源有限公司 | Automatic control system for water heat source centralized heat supply and heat exchange station |
| CN114370665A (en) * | 2022-01-12 | 2022-04-19 | 北京英沣特能源技术有限公司 | Digital heating system in low carbon garden |
| CN114576698A (en) * | 2022-03-03 | 2022-06-03 | 天津大学 | Multi-target monitoring based active disturbance rejection source network tail end collaborative self-optimization-seeking heat supply regulation and control method |
| CN114688606A (en) * | 2022-02-16 | 2022-07-01 | 华能(浙江)能源开发有限公司玉环分公司 | Remote central heating control system |
| CN114704874A (en) * | 2022-03-25 | 2022-07-05 | 内蒙古思铂睿特节能科技有限公司 | Accurate control method for heating parameters of heating station based on flexible heating system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113701234A (en) * | 2021-08-31 | 2021-11-26 | 哈尔滨天达控制股份有限公司 | Intelligent control method, device and system for heat supply secondary network |
| CN114151842A (en) * | 2021-11-25 | 2022-03-08 | 中节能（贵州）建筑能源有限公司 | Automatic control system for water heat source centralized heat supply and heat exchange station |
| CN114370665A (en) * | 2022-01-12 | 2022-04-19 | 北京英沣特能源技术有限公司 | Digital heating system in low carbon garden |
| CN114688606A (en) * | 2022-02-16 | 2022-07-01 | 华能(浙江)能源开发有限公司玉环分公司 | Remote central heating control system |
| CN114688606B (en) * | 2022-02-16 | 2024-04-19 | 华能(浙江)能源开发有限公司玉环分公司 | Remote central heating control system |
| CN114576698A (en) * | 2022-03-03 | 2022-06-03 | 天津大学 | Multi-target monitoring based active disturbance rejection source network tail end collaborative self-optimization-seeking heat supply regulation and control method |
| CN114576698B (en) * | 2022-03-03 | 2023-01-13 | 天津大学 | Multi-target monitoring based active disturbance rejection source network tail end collaborative self-optimization-seeking heat supply regulation and control method |
| CN114704874A (en) * | 2022-03-25 | 2022-07-05 | 内蒙古思铂睿特节能科技有限公司 | Accurate control method for heating parameters of heating station based on flexible heating system |
| CN114704874B (en) * | 2022-03-25 | 2023-12-19 | 内蒙古思铂睿特节能科技有限公司 | Precise control method for heating parameters of heating power station based on flexible heating system |
| CN115218714A (en) * | 2022-07-25 | 2022-10-21 | 贵州汇通华城股份有限公司 | Control device and method for heat exchanger |
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