CN113606654A - Time-sharing and partition automatic control system for pipelines of heat supply system - Google Patents
Time-sharing and partition automatic control system for pipelines of heat supply system Download PDFInfo
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- CN113606654A CN113606654A CN202110881228.6A CN202110881228A CN113606654A CN 113606654 A CN113606654 A CN 113606654A CN 202110881228 A CN202110881228 A CN 202110881228A CN 113606654 A CN113606654 A CN 113606654A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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Abstract
The invention belongs to the technical field of temperature control, and discloses a time-sharing and zone-dividing automatic control system and a control method for a pipeline of a heat supply system, wherein a database is established, monitored data are uploaded and counted to form a memory base, the monitored data are counted and sorted, and the data condition can be monitored in real time to adjust the energy use condition; and transmitting the building equipment information to the equipment for analysis data statistics, and uploading the information to a database for storage to check the energy use condition at any time. The temperature sensor is arranged on the square frame, the square frame is provided with a motor support, a motor is arranged above the motor support, a group of round holes are formed in a side plate of the square frame, and a baffle is arranged at the lower part of each round hole; the cylinder penetrates through the square frame, the other end of the cylinder is fixed on the cross beam, the cross beam is fixed on the rack, the rack is meshed with the gear, and the gear is fixed on an output shaft of the motor. The invention can properly reduce the indoor temperature by the control device in the time period of no use aiming at hot users so as to avoid energy waste.
Description
Technical Field
The invention belongs to the technical field of temperature control, and particularly relates to a time-sharing and zone-dividing automatic control system for a pipeline of a heat supply system.
Background
At present: the heat exchange system uses an extensive design approach. No matter the area size of a community, a water outlet and return control system is adopted, so that the phenomenon of more uneven heating in the community is caused, the floor close to a heat exchange station is close to, the indoor temperature is ensured to be normal by opening a window in winter, otherwise, the floor is too hot, the floor far away from the heat exchange station is only hot in the first few days in the whole winter, and other time periods can only reach the lower limit of national standard temperature basically. The unreasonable energy waste and uneven heating and cooling of users are caused by the unreasonable design. In recent years, some larger communities have partially transformed time-division zone water supply systems. Under certain conditions, the problems of energy waste and uneven cooling are solved. However, the system is still not complete because the system cannot be considered at the beginning of design and no matter the pipe diameter, water quantity, pressure and the like are well matched. In view of the above situation, heat exchanger manufacturers urgently need to provide an intelligent heat exchanger unit capable of working independently. The heat exchange area, the outdoor temperature, the distance, the building structure and the like are fully considered, and the problem of cold and hot energy consumption is solved at one time.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the existing heat exchange system has the phenomenon of uneven heating.
(2) Most of the existing heating system pipelines cannot work independently.
(3) The energy consumption of the existing heating system pipeline is high.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an automatic control system for time-sharing and zone-dividing of a heating system pipeline.
The invention is realized in such a way that the pipeline time-sharing and zone-dividing automatic control system of the heating system comprises a square frame and a temperature sensor, the temperature sensor is arranged on the square frame, the square frame is provided with a motor bracket, a motor is arranged above the motor bracket, a group of round holes are arranged on the side plate of the square frame, a baffle plate is arranged at the lower part of the round hole, one side of one of the round holes is matched with a manual adjusting block, the manual adjusting block is hinged at one end of a screw rod, the other end of the screw rod is provided with a handle, one side of each of the other round holes is respectively provided with an electric adjusting block, each electric adjusting block is fixed at one end of the cylinder, the cylinder penetrates through the square frame, the other end of the cylinder is fixed to the cross beam, the cross beam is fixed to the rack, the rack is meshed with the gear, and the gear is fixed to an output shaft of the motor.
Further, the number of the through holes is 1.
Further, according to the heating system pipeline time-sharing and zone-dividing automatic control system, the screw rod is in threaded connection with the upper side wall of the square support.
In the time-sharing and zone-dividing automatic control system of the heat supply system pipeline, the temperature sensor transmits a detection signal to the full-automatic control system, and the calculated proper control signal is transmitted to the steam inlet control regulating valve through PID calculation; the pressure detection signal of the total backwater distribution detection system is transmitted to the full-automatic control system, the PID calculation is carried out, the calculated proper control signal is transmitted to the frequency converter, and the frequency converter adjusts the frequency to control the running state of the circulating water pump system and maintain the stability of the backwater pressure of the system; when the water pressure is lower, the constant pressure water supplementing system is started to operate; the total water outlet distribution regulating system transmits a secondary side temperature detection signal to the full-automatic control system, calculates through PID and transmits a calculated appropriate control signal to an electric regulating valve of the time-sharing zone control system, and regulates and controls each path respectively, and the regulation of time-sharing zones supplies water and heat.
In the time-sharing and area-dividing automatic control system of the heating system pipeline, the signal is transmitted in a form of 4-20 mA.
Furthermore, in the time-sharing and zone-dividing automatic control system of the heat supply system pipeline, the PID is built in the PLC.
Another objective of the present invention is to provide a time-sharing and area-dividing automatic control method for a heating system pipeline, comprising:
and a database is established, the monitored data is uploaded for statistics to form a memory base, the monitored data is subjected to statistical arrangement, and the data condition can be monitored in real time to adjust the energy use condition.
The building equipment information is transmitted to the equipment for analysis data statistics, and the building equipment information is uploaded to a database for storage, so that the energy use condition can be checked at any time;
further comprising:
the temperature sensor transmits the energy use condition detection signal to the full-automatic control system, calculates through PID and transmits the calculated proper control signal to the steam inlet control regulating valve;
the pressure detection signal of the total backwater distribution detection system is transmitted to the full-automatic control system, the PID calculation is carried out, the calculated proper control signal is transmitted to the frequency converter, and the frequency converter adjusts the frequency to control the running state of the circulating water pump system and maintain the stability of the backwater pressure of the system;
when the water pressure is lower, the constant pressure water supplementing system is started to operate;
the total effluent distribution regulating system transmits a secondary temperature measurement detection signal to the full-automatic control system, calculates through PID and transmits a calculated proper control signal to an electric regulating valve of the time-sharing zone control system, and regulates and controls each path respectively, and the regulation of time-sharing zones supplies water and heat;
the steam admission and pressure control and regulation method of the full-automatic control system comprises the following steps:
the instantaneous flowmeter of the steam inlet control regulating valve, the water pressure sensor and the water pressure liquid level meter are used for monitoring the return water returned by the electric regulating valve in real time; collecting the pressure, the temperature and the fluid volume in the total effluent distribution regulating system by using a related measuring device; comprehensively analyzing the pressure, the temperature and the fluid volume in the system according to the total effluent distribution; by measuring and calculating related data, whether the water pressure is low or not is judged in time, and the early-stage water pressure is monitored in real time;
the method for monitoring early water pressure low in real time based on instantaneous flow comprises the following steps:
(A) a backwater return instantaneous flowmeter is arranged on the steam inlet control regulating valve, the water pressure circulating pool is connected with a water pressure pump, and a water pressure sensor and a water pressure liquid level meter are arranged on the water pressure pump in a matched mode and used for measuring the change of the discharge capacity of the water pressure pump in real time;
(B) and starting the hydraulic pump to enable the water pressure to start circulating, and monitoring the discharge capacity of the hydraulic pump in real time through the data collected by the water pressure sensor and the liquid level change of the water pressure liquid level meter in the circulating process.
Further, a model is established through parameters such as the number of hydraulic pump strokes, the pump volume, the pump displacement coefficient and the like to obtain the displacement of the hydraulic pump; the hydraulic pump is divided into a single-acting pump and a double-acting pump, the actual average discharge capacity is set to be Q,
the actual average displacement of a single-acting pump is:
Q＝βmnLS1；
the actual average displacement of a double-acting pump is:
in the formula:
S1-cross-sectional area of pump piston, S1＝πD 24, decimeter2；
S2-cross-sectional area of tie rod, S2＝πd 24, decimeter2；
L-piston stroke, decimeter;
n-type number of piston strokes, stroke/minute;
m-hydraulic pump cylinder number;
the displacement coefficient of the beta-hydraulic pump is generally 0.8-0.96;
q-hydraulic pump displacement, liter/minute;
d-pump piston width, m;
d-tie width, m.
Monitoring the discharge capacity of the hydraulic pump in real time according to the data acquired by the hydraulic pressure sensor and the liquid level change of the hydraulic level meter; calculating the pump displacement Q according to the hydraulic pump displacement calculation model, and using QIntoAnd QGo outRespectively representing the pumped flow and the pumped flow of the hydraulic pump in the same designated time period; q ═ QGo out-QIntoΔ Q represents the difference between the pumped and pumped water pressures; calculating the thermal expansion quantity Q of the fluid according to the thermal expansion model of the fluidHeat generation；
Establishing the volume change of the fluid caused by the thermal expansion effect of the backwater as follows:
in the formula:
characterised by the effect of temperature
Known as the isobaric coefficient of thermal expansion,. deg.C-1The relative expansion rate of the fluid volume is expressed when the temperature of the fluid rises by 1 ℃ under the condition of certain pressure;
Qheat generation-amount of thermal expansion of fluid, m3；
V-initial volume of fluid, m3；
Δ T-water pressure temperature variation, DEG C;
t0-hydraulic ground temperature, c, assumed as inlet temperature;
t2-formation temperature, c;
c-hydraulic specific heat capacity, J/(kg. degree C);
m-annulus hydraulic mass, kg;
r2-pipe annulus outside diameter, m;
r1-pipe annulus inside diameter, m;
lambda-substance thermal conductivity, W/(m.deg.C);
l-wellbore length, m;
when Q isHeat generationIf Δ Q is 0, it means that there is no abnormal increase in the instantaneous flow rate, that is, there is no early decrease in the water pressure.
Further, the PID calculation method includes:
the fuzzy matrix table of the PID control parameters is obtained by calculation according to the following formula:
Kp＝Kp0+kp*；Ki＝Ki0+ki*；Kd＝Kd0+kd*；
wherein, Kp0、Ki0、Kd0Setting an initial design value of a PID control parameter by a parameter setting method of a traditional PID controller; k is a radical ofp*、ki*And kd*The output values of the three fuzzy controllers are respectively, and the values of three PID control parameters can be automatically adjusted according to the state of a controlled object.
The fuzzy controller defuzzifies the fuzzy subset by adopting a gravity center method, and carries out weighted average by taking a point-to-point control action fuzzy subset membership function on a control action universe as a weight coefficient to obtain a defuzzification result;
the traditional PID control is based on a mathematical model of a controlled object, and the effect of the traditional PID control is based on the accuracy degree established by the mathematical model; since the characteristics of many controlled objects are difficult to grasp, simplifying or approximating the mathematical model of the controlled object at the time of modeling makes it difficult for the controlled object to meet the requirements of idealization in actual operation.
Further, the signal is transmitted in a form of 4-20 mA; the PID is built in the PLC.
Another object of the present invention is to provide an information data processing terminal, which includes a memory and a processor, wherein the memory stores a computer program, and the computer program, when executed by the processor, causes the processor to execute the heating system pipeline time-sharing and zone-dividing automatic control method.
Another object of the present invention is to provide a computer readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the processor executes the time-sharing and partition automatic control method for heating system pipelines.
By combining all the technical schemes, the invention has the advantages and positive effects that:
the temperature sensor transmits temperature data of different time periods to the field controller, the field controller collects the terminal room temperature measured by the temperature sensor, the opening degree of the electric adjusting block is controlled by comparing the temperature with the temperature set by the controller, the field controller controls the motor to start to drive the gear to rotate and drive the rack meshed with the gear to move up and down, thereby driving the cylinder to move up and down and driving the electric adjusting block to move up and down, when the detected temperature is lower than the set temperature, the controller controls the motor to rotate anticlockwise to drive the gear to rotate, thereby driving the rack meshed with the gear to move up and driving the cylinder to move up and driving the electric adjusting block to move up, thereby increasing the opening degree of a heat supply channel, when the detected temperature is higher than the set temperature, the controller controls the motor to rotate clockwise to drive the gear to rotate, thereby driving the rack meshed with the gear to move down, thereby drive the cylinder downstream, drive electronic regulating block downstream, thereby reduce water supply channel's aperture, finally control indoor temperature through adjusting heat supply flow, after having adjusted the flow according to preset data, the motor is closed under site controller's effect, in the region of difference, can adjust water supply flow through manual debugging manual regulating block, manual rotation handle during the use, it rotates to drive the screw rod, the screw rod reciprocates and drives manual regulating block and reciprocate, when manual regulating block moves up, heat supply channel grow, heat supply flow increases, the temperature improves, when manual regulating block moves down, water supply channel diminishes, water supply flow diminishes, the temperature reduces. The indoor temperature can be properly reduced by the control device in the unmanned time period aiming at the hot users, so that the energy waste is avoided.
The invention provides a time-sharing and zone-dividing automatic control method for a pipeline of a heat supply system, wherein a temperature sensor transmits a detection signal to a full-automatic control system, and the detection signal is calculated by PID (proportion integration differentiation) and transmits a calculated proper control signal to an inlet control regulating valve; the pressure detection signal of the total backwater distribution detection system is transmitted to the full-automatic control system, the PID calculation is carried out, the calculated proper control signal is transmitted to the frequency converter, and the frequency converter adjusts the frequency to control the running state of the circulating water pump system and maintain the stability of the backwater pressure of the system; when the water pressure is lower, the constant pressure water supplementing system is started to operate; the total effluent distribution regulating system transmits a secondary temperature measurement detection signal to the full-automatic control system, calculates through PID and transmits a calculated proper control signal to an electric regulating valve of the time-sharing zone control system, and regulates and controls each path respectively, and the regulation of time-sharing zones supplies water and heat; the steam admission and pressure control and regulation method of the full-automatic control system comprises the following steps: the instantaneous flowmeter of the steam inlet control regulating valve, the water pressure sensor and the water pressure liquid level meter are used for monitoring the return water returned by the electric regulating valve in real time; collecting the pressure, the temperature and the fluid volume in the total effluent distribution regulating system by using a related measuring device; comprehensively analyzing the pressure, the temperature and the fluid volume in the system according to the total effluent distribution; through measurement and calculation of related data, whether the water pressure is low or not is judged in time, and real-time monitoring on early water pressure is achieved. By the control method, intelligent control is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a front view of a heating system pipeline time-sharing and zone-dividing automatic control system provided by an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a time-sharing and zone-dividing automatic control system for pipelines of a heating system according to an embodiment of the present invention.
Fig. 3 is a flowchart of the operation of the time-sharing and zone-dividing automatic control system for the pipes of the heating system according to the embodiment of the present invention.
In the figure: 1. a cross beam; 2. a rack; 3. a cylinder; 4. a square frame; 5. an electric adjusting block; 6. a baffle plate; 7. a circular hole; 8. a screw; 9. a motor bracket; 10. a gear; 11. a handle; 12. an electric motor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of specific embodiments that can be constructed in accordance with the teachings of the present invention
The present invention is illustrated only and not intended to be limited.
Aiming at the problems in the prior art, the invention provides a time-sharing and zone-dividing automatic control system for a pipeline of a heating system, which is described in detail with reference to the attached drawings.
As shown in fig. 1-3, a time-sharing and area-dividing automatic control system for a heating system pipeline is provided, which comprises a beam 1, a rack 2, a cylinder 3, a square frame 4, an electric adjusting block 5, a baffle 6, a round hole 7, a screw 8, a motor bracket 9, a gear 10, a handle 11, and a motor 12.
Temperature sensor sets up square frame 4 is last, the last motor support that is provided with of square frame, motor support top is equipped with the motor, be provided with a set of round hole on the square frame curb plate, the lower part of round hole is provided with the baffle, and one of them round hole one side cooperation has manual regulating block, manual regulating block articulates in screw rod one end, the screw rod other end is provided with the handle, all the other every round hole one side is provided with electronic regulating block respectively, every electronic regulating block all fixes in cylindrical one end, the cylinder passes square frame and the other end are fixed on the crossbeam, the crossbeam is fixed on the rack, rack toothing has the gear, the gear is fixed on the output shaft of motor.
The number of the through holes is 1.
The screw rod is in threaded connection with the upper side wall of the square support.
The temperature sensor transmits a detection signal to the full-automatic control system, calculates through PID and transmits a calculated proper control signal to the steam inlet control regulating valve; the pressure detection signal of the total backwater distribution detection system is transmitted to the full-automatic control system, the PID calculation is carried out, the calculated proper control signal is transmitted to the frequency converter, and the frequency converter adjusts the frequency to control the running state of the circulating water pump system and maintain the stability of the backwater pressure of the system; when the water pressure is lower, the constant pressure water supplementing system is started to operate; the total water outlet distribution regulating system transmits a secondary side temperature detection signal to the full-automatic control system, calculates through PID and transmits a calculated appropriate control signal to an electric regulating valve of the time-sharing zone control system, and regulates and controls each path respectively, and the regulation of time-sharing zones supplies water and heat.
The signal is transmitted in the form of 4-20 mA.
The PID is built in the PLC.
The invention solves the problem that the heat exchange system is unevenly heated. The problem that most pipelines of a heating system cannot work independently is solved. The problem that the pipeline energy consumption of the existing heating system is high is solved.
The temperature sensor of the invention transmits temperature data of different time periods to the site controller, the site controller collects the terminal room temperature measured by the temperature sensor, the opening degree of the electric adjusting block is controlled by comparing with the temperature set by the controller, the site controller controls the motor to start to drive the gear to rotate, the rack meshed with the gear is driven to move up and down, thereby the cylinder is driven to move up and down, the electric adjusting block is driven to move up and down, when the detected temperature is lower than the set temperature, the controller controls the motor to rotate anticlockwise, the gear is driven to rotate, the rack meshed with the gear is driven to move up, thereby the cylinder is driven to move up, the electric adjusting block is driven to move up, thereby the opening degree of the heat supply channel is increased, when the detected temperature is higher than the set temperature, the controller controls the motor to rotate clockwise, the gear is driven to rotate, the rack meshed with the gear is driven to move down, thereby drive the cylinder downstream, drive electronic regulating block downstream, thereby reduce water supply channel's aperture, finally control indoor temperature through adjusting heat supply flow, after having adjusted the flow according to preset data, the motor is closed under site controller's effect, in the region of difference, can adjust water supply flow through manual debugging manual regulating block, manual rotation handle during the use, it rotates to drive the screw rod, the screw rod reciprocates and drives manual regulating block and reciprocate, when manual regulating block moves up, heat supply channel grow, heat supply flow increases, the temperature improves, when manual regulating block moves down, water supply channel diminishes, water supply flow diminishes, the temperature reduces. The indoor temperature can be properly reduced by the control device in the unmanned time period aiming at the hot users, so that the energy waste is avoided.
In a preferred embodiment of the present invention, the present invention provides a time-sharing and area-dividing automatic control method for a heating system pipeline, comprising:
and a database is established, the monitored data is uploaded for statistics to form a memory base, the monitored data is subjected to statistical arrangement, and the data condition can be monitored in real time to adjust the energy use condition.
The building equipment information is transmitted to the equipment for analysis data statistics, and the building equipment information is uploaded to a database for storage, so that the energy use condition can be checked at any time;
further comprising:
the temperature sensor transmits the energy use condition detection signal to the full-automatic control system, calculates through PID and transmits the calculated proper control signal to the steam inlet control regulating valve;
the pressure detection signal of the total backwater distribution detection system is transmitted to the full-automatic control system, the PID calculation is carried out, the calculated proper control signal is transmitted to the frequency converter, and the frequency converter adjusts the frequency to control the running state of the circulating water pump system and maintain the stability of the backwater pressure of the system;
when the water pressure is lower, the constant pressure water supplementing system is started to operate;
the total effluent distribution regulating system transmits a secondary temperature measurement detection signal to the full-automatic control system, calculates through PID and transmits a calculated proper control signal to an electric regulating valve of the time-sharing zone control system, and regulates and controls each path respectively, and the regulation of time-sharing zones supplies water and heat;
the steam admission and pressure control and regulation method of the full-automatic control system comprises the following steps:
the instantaneous flowmeter of the steam inlet control regulating valve, the water pressure sensor and the water pressure liquid level meter are used for monitoring the return water returned by the electric regulating valve in real time; collecting the pressure, the temperature and the fluid volume in the total effluent distribution regulating system by using a related measuring device; comprehensively analyzing the pressure, the temperature and the fluid volume in the system according to the total effluent distribution; by measuring and calculating related data, whether the water pressure is low or not is judged in time, and the early-stage water pressure is monitored in real time;
the method for monitoring early water pressure low in real time based on instantaneous flow comprises the following steps:
(A) a backwater return instantaneous flowmeter is arranged on the steam inlet control regulating valve, the water pressure circulating pool is connected with a water pressure pump, and a water pressure sensor and a water pressure liquid level meter are arranged on the water pressure pump in a matched mode and used for measuring the change of the discharge capacity of the water pressure pump in real time;
(B) and starting the hydraulic pump to enable the water pressure to start circulating, and monitoring the discharge capacity of the hydraulic pump in real time through the data collected by the water pressure sensor and the liquid level change of the water pressure liquid level meter in the circulating process.
Establishing a model according to parameters such as the number of hydraulic pump strokes, the pump volume, the pump displacement coefficient and the like to obtain the displacement of the hydraulic pump; the hydraulic pump is divided into a single-acting pump and a double-acting pump, the actual average discharge capacity is set to be Q,
the actual average displacement of a single-acting pump is:
Q＝βmnLS1；
the actual average displacement of a double-acting pump is:
in the formula:
S1-cross-sectional area of pump piston, S1＝πD 24, decimeter2；
S2-cross-sectional area of tie rod, S2＝πd 24, decimeter2；
L-piston stroke, decimeter;
n-type number of piston strokes, stroke/minute;
m-hydraulic pump cylinder number;
the displacement coefficient of the beta-hydraulic pump is generally 0.8-0.96;
q-hydraulic pump displacement, liter/minute;
d-pump piston width, m;
d-tie width, m.
Monitoring the discharge capacity of the hydraulic pump in real time according to the data acquired by the hydraulic pressure sensor and the liquid level change of the hydraulic level meter; calculating the pump displacement Q according to the hydraulic pump displacement calculation model, and using QIntoAnd QGo outRespectively representing the pumped flow and the pumped flow of the hydraulic pump in the same designated time period; q ═ QGo out-QIntoΔ Q represents the difference between the pumped and pumped water pressures; calculating the thermal expansion quantity Q of the fluid according to the thermal expansion model of the fluidHeat generation；
Establishing the volume change of the fluid caused by the thermal expansion effect of the backwater as follows:
in the formula:
characterised by the effect of temperature
Known as the isobaric coefficient of thermal expansion,. deg.C-1The relative expansion rate of the fluid volume is expressed when the temperature of the fluid rises by 1 ℃ under the condition of certain pressure;
Qheat generation──Amount of thermal expansion of fluid, m3；
V-initial volume of fluid, m3；
Δ T-water pressure temperature variation, DEG C;
t0-hydraulic ground temperature, c, assumed as inlet temperature;
t2-formation temperature, c;
c-hydraulic specific heat capacity, J/(kg. degree C);
m-annulus hydraulic mass, kg;
r2-pipe annulus outside diameter, m;
r1-pipe annulus inside diameter, m;
lambda-substance thermal conductivity, W/(m.deg.C);
l-wellbore length, m;
when Q isHeat generationIf Δ Q is 0, it means that there is no abnormal increase in the instantaneous flow rate, that is, there is no early decrease in the water pressure.
Further, the PID calculation method includes:
the fuzzy matrix table of the PID control parameters is obtained by calculation according to the following formula:
Kp＝Kp0+kp*；Ki＝Ki0+ki*；Kd＝Kd0+kd*；
wherein, Kp0、Ki0、Kd0Setting an initial design value of a PID control parameter by a parameter setting method of a traditional PID controller; k is a radical ofp*、ki*And kd*The output values of the three fuzzy controllers are respectively, and the values of three PID control parameters can be automatically adjusted according to the state of a controlled object.
The fuzzy controller defuzzifies the fuzzy subset by adopting a gravity center method, and carries out weighted average by taking a point-to-point control action fuzzy subset membership function on a control action universe as a weight coefficient to obtain a defuzzification result;
the traditional PID control is based on a mathematical model of a controlled object, and the effect of the traditional PID control is based on the accuracy degree established by the mathematical model; since the characteristics of many controlled objects are difficult to grasp, simplifying or approximating the mathematical model of the controlled object at the time of modeling makes it difficult for the controlled object to meet the requirements of idealization in actual operation.
The signal is transmitted in a form of 4-20 mA; the PID is built in the PLC.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A time-sharing and zone-dividing automatic control method for a pipeline of a heat supply system is characterized by comprising the following steps:
establishing a database, uploading and counting the monitored data to form a memory base, counting and sorting the monitored data, and adjusting the energy use condition by monitoring the data condition in real time;
and transmitting the building equipment information to the equipment for analysis data statistics, and uploading the information to a database for storage to check the energy use condition at any time.
2. The heating system pipeline time-sharing and zone-dividing automatic control method according to claim 1, wherein the heating system pipeline time-sharing and zone-dividing automatic control method further comprises:
the temperature sensor transmits the energy use condition detection signal to the full-automatic control system, calculates through PID and transmits the calculated proper control signal to the steam inlet control regulating valve;
the pressure detection signal of the total backwater distribution detection system is transmitted to the full-automatic control system, the PID calculation is carried out, the calculated proper control signal is transmitted to the frequency converter, and the frequency converter adjusts the frequency to control the running state of the circulating water pump system and maintain the stability of the backwater pressure of the system;
when the water pressure is lower, the constant pressure water supplementing system is started to operate;
the total effluent distribution regulating system transmits a secondary temperature measurement detection signal to the full-automatic control system, calculates through PID and transmits a calculated proper control signal to an electric regulating valve of the time-sharing zone control system, and regulates and controls each path respectively, and the regulation of time-sharing zones supplies water and heat;
the steam admission and pressure control and regulation method of the full-automatic control system comprises the following steps:
the instantaneous flowmeter of the steam inlet control regulating valve, the water pressure sensor and the water pressure liquid level meter are used for monitoring the return water returned by the electric regulating valve in real time; collecting the pressure, the temperature and the fluid volume in the total effluent distribution regulating system by using a related measuring device; comprehensively analyzing the pressure, the temperature and the fluid volume in the system according to the total effluent distribution; by measuring and calculating related data, whether the water pressure is low or not is judged in time, and the early-stage water pressure is monitored in real time;
the method for monitoring early water pressure low in real time based on instantaneous flow comprises the following steps:
(A) a backwater return instantaneous flowmeter is arranged on the steam inlet control regulating valve, the water pressure circulating pool is connected with a water pressure pump, and a water pressure sensor and a water pressure liquid level meter are arranged on the water pressure pump in a matched mode and used for measuring the change of the discharge capacity of the water pressure pump in real time;
(B) and starting the hydraulic pump to enable the water pressure to start circulating, and monitoring the discharge capacity of the hydraulic pump in real time through the data collected by the water pressure sensor and the liquid level change of the water pressure liquid level meter in the circulating process.
3. The heating system pipeline time-sharing and zone-dividing automatic control method according to claim 1, characterized in that a model is established through parameters such as hydraulic pump stroke number, pump volume and pump displacement coefficient to obtain hydraulic pump displacement; the hydraulic pump is divided into a single-acting pump and a double-acting pump, the actual average discharge capacity is set to be Q,
the actual average displacement of a single-acting pump is:
Q＝βmnLS1；
the actual average displacement of a double-acting pump is:
in the formula:
S1-cross-sectional area of pump piston, S1＝πD24, decimeter2；
S2-cross-sectional area of tie rod, S2＝πd24, decimeter2；
L-piston stroke, decimeter;
n-type number of piston strokes, stroke/minute;
m-hydraulic pump cylinder number;
the displacement coefficient of the beta-hydraulic pump is generally 0.8-0.96;
q-hydraulic pump displacement, liter/minute;
d-pump piston width, m;
d-tie width, m;
monitoring the discharge capacity of the hydraulic pump in real time according to the data acquired by the hydraulic pressure sensor and the liquid level change of the hydraulic level meter; calculating the pump displacement Q according to the hydraulic pump displacement calculation model, and using QIntoAnd QGo outRespectively representing the pumped flow and the pumped flow of the hydraulic pump in the same designated time period; q ═ QGo out-QIntoΔ Q represents the difference between the pumped and pumped water pressures; calculating the thermal expansion quantity Q of the fluid according to the thermal expansion model of the fluidHeat generation；
Establishing the volume change of the fluid caused by the thermal expansion effect of the backwater as follows:
in the formula:
characterised by the effect of temperature
Known as the isobaric coefficient of thermal expansion,. deg.C-1The relative expansion rate of the fluid volume is expressed when the temperature of the fluid rises by 1 ℃ under the condition of certain pressure;
Qheat generation-amount of thermal expansion of fluid, m3；
V-initial volume of fluid, m3；
Δ T-water pressure temperature variation, DEG C;
t0-hydraulic ground temperature, c, assumed as inlet temperature;
t2-formation temperature, c;
c-hydraulic specific heat capacity, J/(kg. degree C);
m-annulus hydraulic mass, kg;
r2-pipe annulus outside diameter, m;
r1-pipe annulus inside diameter, m;
lambda-substance thermal conductivity, W/(m.deg.C);
l-wellbore length, m;
when Q isHeat generationIf Δ Q is 0, it means that there is no abnormal increase in the instantaneous flow rate, that is, there is no early decrease in the water pressure.
4. The heating system pipeline time-sharing and zone-dividing automatic control method according to claim 1, wherein the PID calculation method comprises the following steps:
the fuzzy matrix table of the PID control parameters is obtained by calculation according to the following formula:
Kp＝Kp0+kp*；Ki＝Ki0+ki*；Kd＝Kd0+kd*；
wherein, Kp0、Ki0、Kd0For initial design values of PID control parameters, by conventional PID controllersSetting a parameter setting method; k is a radical ofp*、ki*And kd*The output values of the three fuzzy controllers are respectively, and the values of three PID control parameters can be automatically adjusted according to the state of a controlled object.
5. The heating system pipeline time-sharing and partition automatic control method according to claim 4, wherein the fuzzy controller defuzzifies the fuzzy subset by a gravity center method, and performs weighted average by using a point-to-point control action fuzzy subset membership function on a control action domain as a weight coefficient to obtain a defuzzification result;
the traditional PID control is based on a mathematical model of a controlled object, and the effect of the traditional PID control is based on the accuracy degree established by the mathematical model; since the characteristics of many controlled objects are difficult to grasp, simplifying or approximating the mathematical model of the controlled object at the time of modeling makes it difficult for the controlled object to meet the requirements of idealization in actual operation.
6. A heating system pipeline time-sharing and zone-dividing automatic control method as claimed in claim 1, wherein the signal is transmitted in a form of 4-20 mA; the PID is built in the PLC.
7. A time-sharing and area-dividing automatic control system for pipelines of a heating system is characterized by comprising a square frame and a temperature sensor, the temperature sensor is arranged on the square frame, the square frame is provided with a motor bracket, a motor is arranged above the motor bracket, a group of round holes are arranged on the side plate of the square frame, a baffle plate is arranged at the lower part of the round hole, one side of one of the round holes is matched with a manual adjusting block, the manual adjusting block is hinged at one end of a screw rod, the other end of the screw rod is provided with a handle, one side of each of the other round holes is respectively provided with an electric adjusting block, each electric adjusting block is fixed at one end of the cylinder, the cylinder penetrates through the square frame, the other end of the cylinder is fixed to the cross beam, the cross beam is fixed to the rack, the rack is meshed with the gear, and the gear is fixed to an output shaft of the motor.
8. A heating system pipe timesharing and zoning automatic control system according to claim 7, said number of said through holes is 1; the screw rod is in threaded connection with the upper side wall of the square support.
9. An information data processing terminal, characterized in that the information data processing terminal comprises a memory and a processor, the memory stores a computer program, and the computer program is executed by the processor, so that the processor executes the heating system pipeline time-sharing and zone-dividing automatic control method according to any one of claims 1 to 6.
10. A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to execute the heating system pipeline time-sharing zone automatic control method according to any one of claims 1 to 6.
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