CN111306612A - Secondary network regulation and control method and system for heat exchange station - Google Patents
Secondary network regulation and control method and system for heat exchange station Download PDFInfo
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- CN111306612A CN111306612A CN202010180631.1A CN202010180631A CN111306612A CN 111306612 A CN111306612 A CN 111306612A CN 202010180631 A CN202010180631 A CN 202010180631A CN 111306612 A CN111306612 A CN 111306612A
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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
Abstract
The invention discloses a method and a system for regulating and controlling a secondary network of a heat exchange station, wherein the regulating and controlling method comprises the following steps: acquiring a secondary network backwater temperature detection value and an indoor temperature detection value; calculating a secondary network return water temperature control set value according to the indoor temperature detection value and the secondary network non-intermediate unit return water temperature correction value; comparing the secondary network return water temperature control set value with the secondary network return water temperature detection value to obtain a return water temperature control error; calculating the opening change value of the secondary network regulating and controlling valve according to the return water temperature control error and the physical parameters of the secondary network; and adjusting the opening of the secondary network regulating and controlling valve according to the opening change value of the secondary network regulating and controlling valve. The method and the system for regulating and controlling the secondary network of the heat exchange station improve the thermodynamic balance degree and the hydraulic balance degree and the control precision of the secondary network and heat users, provide necessary conditions for the optimal operation of the heat exchange station, meet the heat supply quality requirements of the heat users, fully utilize the free heat of the system, reduce the energy consumption and pollutant emission of the system, and reduce the labor cost and the labor intensity.
Description
Technical Field
The invention relates to the technical field of heat exchange station control of a central heating system, in particular to a secondary network regulation and control method and a secondary network regulation and control system for a heat exchange station.
Background
The secondary network of the heat exchange station of the current centralized heating system is one of the main links for ensuring the heat supply quality of heat users, balancing the working conditions of the pipe network and saving energy and reducing consumption. On the premise that the heat source, the primary network and the heat exchange station of the heat supply system have optimized control means and measures, the secondary network becomes the 'last kilometer' of the heat supply system. Most of the existing secondary network buildings/units have only valve isolation function, and even if the adjusting valves are installed, the adjusting valves are rarely adjusted or the functions are invalid in actual operation; in addition, a self-operated balance valve (a self-operated flow balance valve or a self-operated differential pressure balance valve) is arranged at the thermal inlet of part of the secondary network buildings/units, and due to the fact that the general water quality of the secondary network is poor, the pressure guide pipe is easy to block and the balance valve is easy to lose efficacy, and further the working condition of the secondary network is disordered. The secondary network hydraulic power and thermal power imbalance phenomena caused by the reasons are very common, energy waste is caused besides the difficulty in meeting the requirements of heat supply quality and thermal comfort of heat users, and the heat supply operation cost (energy consumption and labor cost) and labor intensity are increased.
In recent years, part of heating power companies adopt an intelligent secondary network control system based on a cloud platform to realize the optimization control of a secondary network and solve the phenomenon of hydraulic and heating power imbalance of the secondary network, but the average value of the return water temperature of a heating power inlet of the secondary network is usually used as a control set value for regulation and control, or the return water temperature of a heating power inlet at the corner of a building is used for correction, the regulation and control factors are single, and effective hydraulic and heating power regulation of the secondary network is difficult to realize. In addition, in the intelligent secondary network control system disclosed in the patent document, for example: in patent document 1-CN201910470504.2, the hydraulic working condition of a heating system is simulated and simulated by a computer, the opening of a valve is calculated by combining a valve flow characteristic curve, and then the hydraulic balance of a secondary network is realized by debugging according to the change of return water temperature and indoor temperature; in patent document 2-CN201710367492.1, the indoor temperature of the user is directly controlled, the return water temperature and the actual indoor temperature are directly adjusted in control, a user indoor temperature sensor and a user inlet electromagnetic valve are adopted, the user inlet water flow is controlled according to the current indoor temperature of the user, the indoor temperature is timely adjusted, the heat supply circulating water quantity is reduced, the problems of overheating at the near end and supercooling at the far end of a heat supply water outlet are avoided, the control parameters of a circulating pump are optimized, and the energy consumption of the system is reduced. However, it is difficult to achieve accurate hydraulic condition simulation of the secondary network only by using a computer program, and even if a secondary network system is achieved, the popularization to other secondary networks is almost impossible, time and labor are wasted, and the accuracy is inaccurate; the stability of the pressure working condition of the secondary system can be influenced by adopting an indoor temperature plus electromagnetic valve switch adjustment control mode, the large fluctuation of the indoor temperature is easily caused, and the thermal comfort and the accurate control target of a user are difficult to meet.
Therefore, how to effectively control the thermodynamic and hydraulic balance of the secondary network and the heat consumer is an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a method and a system for regulating and controlling a secondary network of a heat exchange station, which are used for solving the problem of unbalance of the heat and water power of the secondary network and a heat user of the heat exchange station.
In order to achieve the above object, an embodiment of the present invention provides a method for adjusting and controlling a secondary network of a heat exchange station, including:
acquiring a secondary network backwater temperature detection value and an indoor temperature detection value;
calculating a secondary network return water temperature control set value according to the indoor temperature detection value and the secondary network non-intermediate unit return water temperature correction value;
comparing the secondary network return water temperature control set value with the secondary network return water temperature detection value to obtain a return water temperature control error;
calculating the opening change value of the secondary network regulating and controlling valve according to the return water temperature control error and the physical parameters of the secondary network;
and adjusting the opening of the secondary network regulating and controlling valve according to the opening change value of the secondary network regulating and controlling valve.
According to an embodiment of the present invention, the step of calculating the control set value of the return water temperature of the secondary network according to the detected indoor temperature value and the corrected value of the return water temperature of the non-intermediate unit of the secondary network comprises:
acquiring return water temperatures of a plurality of intermediate units of the secondary network;
calculating to obtain a secondary network middle unit backwater temperature average value according to the obtained backwater temperatures of the multiple middle units of the secondary network, and taking the secondary network middle unit backwater temperature average value as a secondary network backwater temperature basic set value;
and determining the control set value of the return water temperature of the secondary network according to the indoor temperature detection value, the basic set value of the return water temperature of the secondary network, the corrected value of the return water temperature of the non-intermediate unit of the secondary network, the corrected value of the indoor temperature of the intermediate unit of the secondary network and the corrected value of the indoor temperature of the non-intermediate unit of the secondary network.
According to another embodiment of the present invention, the step of calculating the opening change value of the secondary network regulating and controlling valve according to the return water temperature control error and the physical parameter of the secondary network comprises:
acquiring a valve characteristic curve of the secondary network regulating and controlling valve;
acquiring the physical structure characteristics of the secondary network;
and calculating according to the valve characteristic curve of the secondary network regulating and controlling valve, the return water temperature control error and the physical structure characteristic of the secondary network to obtain the opening change numerical value of the secondary network regulating and controlling valve.
According to another embodiment of the invention, the physical structural characteristics of the secondary mesh include worst-case loops, heat sinks, and regulated valve positions.
According to another embodiment of the present invention, the step of adjusting the opening degree of the secondary network regulating and controlling valve according to the opening degree variation value of the secondary network regulating and controlling valve further includes:
obtaining an actual opening change value of the secondary network regulating and controlling valve after the waiting preset time is determined according to a user heat dissipation device;
and if the actual opening change value of the secondary network regulating and controlling valve meets the preset valve opening change condition, the regulation and control of the secondary network regulating and controlling valve are completed.
According to another embodiment of the present invention, the preset valve opening variation condition is that the opening variation range of the secondary grid control valve is [ -3% to 3% ].
On the other hand, the embodiment of the invention also provides a heat exchange station secondary network regulation and control system which comprises a cloud platform and a communication terminal, wherein the heat exchange station secondary network regulation and control system further comprises a secondary network regulation and control valve, a return water temperature collector and an indoor temperature collector;
the return water temperature collector is used for acquiring return water temperature detection values of the secondary network and return water temperatures of a plurality of intermediate units of the secondary network;
the indoor temperature collector is used for acquiring an indoor temperature detection value;
the communication terminal is used for sending the temperature data acquired by the return water temperature collector and the indoor temperature collector to the cloud platform and receiving the control information of the secondary network regulating and controlling valve sent by the cloud platform;
the cloud platform is used for calculating according to the temperature data sent by the communication terminal and the physical parameters of the secondary network to obtain control information of the secondary network regulating and controlling valve;
the secondary network regulating and controlling valve is used for regulating the valve opening according to the control information of the secondary network regulating and controlling valve;
and the control information of the secondary network regulating and controlling valve comprises an opening change numerical value of the secondary network regulating and controlling valve.
According to an embodiment of the present invention, the secondary network regulating valve is a manual regulating valve.
According to another embodiment of the invention, the return water temperature collector is integrated in the valve body of the secondary grid regulating and controlling valve.
According to another embodiment of the invention, the return water temperature collector is detachably arranged in the valve body of the secondary grid regulating and controlling valve.
The method of the invention has the following advantages:
according to the method and the system for regulating and controlling the secondary network of the heat exchange station, firstly, a secondary network return water temperature detection value and an indoor temperature detection value are obtained, then a secondary network return water temperature control set value is calculated according to the indoor temperature detection value and a secondary network non-intermediate unit return water temperature correction value, a return water temperature control error is obtained by comparing the secondary network return water temperature control set value with the secondary network return water temperature detection value, an opening change value of a secondary network regulating and controlling valve is calculated according to the return water temperature control error and secondary network physical parameters, and then the opening of the secondary network regulating and controlling valve is regulated, so that the opening of the secondary network regulating and controlling valve is set at a proper position to regulate and control the heat and water power of a secondary network and a heat user to reach a balanced state. According to the secondary network regulation and control method of the heat exchange station, the regulation opening degree value of the secondary network regulation and control valve is determined through multiple factors such as the return water temperature detection value of the secondary network, the indoor temperature detection value, the return water temperature correction value of the non-intermediate unit of the secondary network, the physical parameters of the secondary network and the like, the thermodynamic balance degree and the hydraulic balance degree of the secondary network and a heat user are improved, necessary conditions are provided for the optimized operation of the heat exchange station, the heat supply quality requirements of the heat user are met, the free heat of the system is fully utilized, the energy consumption and pollutant emission of the system are reduced, and the labor cost and the labor intensity are.
Drawings
Fig. 1 is a schematic flow diagram of some embodiments of a method for secondary network regulation of a heat exchange station according to the present invention;
fig. 2 is a schematic flow chart illustrating a step 200 of a method for controlling a secondary network of a heat exchange station according to the present invention.
Fig. 3 is a schematic flow chart diagram of some embodiments of steps 400 of a method for secondary network regulation of a heat exchange station of the present invention;
fig. 4 is a schematic flow diagram of further embodiments of a method for secondary network regulation in a heat exchange station according to the present invention;
fig. 5 is a schematic structural diagram of an embodiment of a heat exchange station secondary network regulation and control system of the present invention;
FIG. 6 is a schematic structural diagram of a planar hard seal balanced valve and a built-in NB-IoT temperature sensor according to the present invention;
FIG. 7 is a schematic diagram of the W-shaped ball valve and the built-in NB-IoT temperature sensor according to the present invention;
FIG. 8 is a characteristic curve of the relationship between the opening variation value of the secondary network regulating and controlling valve and the return water temperature control error.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Referring to fig. 1, a method for regulating and controlling a secondary network of a heat exchange station according to an embodiment of the present invention is shown, and includes:
step 100: acquiring a secondary network backwater temperature detection value and an indoor temperature detection value;
in the step, the temperature sensor arranged in the secondary network and the indoor temperature sensor can be adopted to collect the return water temperature of the secondary network and the indoor temperature in real time so as to obtain the return water temperature detection value of the secondary network and the indoor temperature detection value.
Step 200: calculating a secondary network return water temperature control set value according to the indoor temperature detection value and the secondary network non-intermediate unit return water temperature correction value;
because the actual site indoor temperature installation position usually has deviation with the really required indoor temperature monitoring point position (in the range of 1-1.5m above the geometric center of the main room of the heat consumer), the influence of the site indoor temperature installation position on the return water temperature should be corrected according to experience. The area index of heat loss of the secondary grid non-intermediate unit heat consumers is higher than that of the intermediate units, so the heat supply of such units needs to be compensated in order to obtain the same indoor temperature as the intermediate unit heat consumers. In the step, the return water temperature control set value of the secondary network is jointly corrected through two detection parameters, namely an indoor temperature detection value and a return water temperature correction value of a non-intermediate unit of the secondary network, so that the requirements for setting the individualized return water temperature and fine control are met. It should be noted that the corrected value of the return water temperature of the non-intermediate unit of the secondary network is determined together with the ratio of the heat supply amount required by the non-intermediate unit and the intermediate unit according to the actual operation experience.
Step 300: comparing the secondary network return water temperature control set value with the secondary network return water temperature detection value to obtain a return water temperature control error;
in this step, the difference between the set value of the return water temperature of the secondary network and the detected value of the return water temperature of the secondary network can be calculated to be used as the control error of the return water temperature, and of course, the ratio of the two values can also be used, and the method is not particularly limited.
Step 400: calculating the opening change value of the secondary network regulating and controlling valve according to the return water temperature control error and the physical parameters of the secondary network;
return water temperature control errors and secondary network physical parameters such as: and summarizing and finishing the position of the regulating valve in the secondary network and regulating performance curves and other factors to calculate the opening change value of the secondary network regulating valve by using an opening change value calculation formula of the secondary network regulating valve.
Step 500: and adjusting the opening of the secondary network regulating and controlling valve according to the opening change value of the secondary network regulating and controlling valve.
In the step, the field worker can manually adjust the opening of the secondary network regulating and controlling valve according to the opening change value of the secondary network regulating and controlling valve, and can also automatically adjust the secondary network regulating and controlling valve intelligently, and the specific limitation is not made here.
According to the secondary network regulation and control method of the heat exchange station, firstly, a secondary network return water temperature detection value and an indoor temperature detection value are obtained, then a secondary network return water temperature control set value is calculated according to the indoor temperature detection value and a secondary network non-intermediate unit return water temperature correction value, a return water temperature control error is obtained by comparing the secondary network return water temperature control set value with the secondary network return water temperature detection value, an opening change value of a secondary network regulation and control valve is calculated according to the return water temperature control error and a secondary network physical parameter, and then the opening of the secondary network regulation and control valve is adjusted, so that the opening of the secondary network regulation and control valve is set at a proper position to regulate and control the heat and water power of a secondary network and a heat user to reach a balance state. According to the secondary network regulation and control method of the heat exchange station, the regulation opening degree value of the secondary network regulation and control valve is determined through multiple factors such as the return water temperature detection value of the secondary network, the indoor temperature detection value, the return water temperature correction value of the non-intermediate unit of the secondary network, the physical parameters of the secondary network and the like, the thermodynamic balance degree and the hydraulic balance degree of the secondary network and a heat user are improved, necessary conditions are provided for the optimized operation of the heat exchange station, the heat supply quality requirements of the heat user are met, the free heat of the system is fully utilized, the energy consumption and pollutant emission of the system are reduced, and the labor cost and the labor intensity are.
In some embodiments, referring to fig. 2, step 200 of the method for regulating and controlling a secondary network of a heat exchange station of the present invention includes:
step 201: acquiring return water temperatures of a plurality of intermediate units of the secondary network;
in the step, the return water temperature of the intermediate unit is acquired by a return water temperature sensor arranged on a regulating valve body of a secondary network return water pipeline.
Step 202: calculating to obtain a secondary network middle unit backwater temperature average value according to the obtained backwater temperatures of the plurality of middle units of the secondary network, and taking the secondary network middle unit backwater temperature average value as a secondary network backwater temperature basic set value;
in the step, the basic set value of the return water temperature of the secondary network is expressed as follows:
wherein, Tr2spoIs a basic set value of the return water temperature of the secondary network, and the unit is,
the average value of the return water temperature of the thermal inlet of the middle unit is shown in a unit of ℃.
Step 203: and determining a secondary network backwater temperature control set value according to the indoor temperature detection value, the secondary network backwater temperature basic set value, the secondary network non-intermediate unit backwater temperature correction value, the secondary network intermediate unit indoor temperature correction value and the secondary network non-intermediate unit indoor temperature correction value.
In the step, the control set value of the return water temperature of the secondary network is expressed as follows:
wherein, Tr2spControlling a set value for the temperature of the return water of the secondary network, wherein the unit is;
i. j is a number;
m and n are the number of the heating power inlet regulating valves arranged in the middle and non-middle units;
Tr2ctthe corrected value of the return water temperature of the thermal inlet of the non-intermediate unit is in a unit of ℃.
In the method for regulating and controlling the secondary network of the heat exchange station, various temperature parameters are considered for determining the set value of the control of the return water temperature of the secondary network, including the following steps: the return water temperature of a plurality of middle units of the secondary network, the indoor temperature detection value, the return water temperature correction value of the non-middle unit of the secondary network, the indoor temperature correction value of the middle unit of the secondary network and the indoor temperature correction value of the non-middle unit of the secondary network enable the setting of the return water temperature control setting value of the secondary network to be more accurate, and the control precision of the thermal power and hydraulic power balance of the secondary network and a heat user is further improved.
In some embodiments, referring to fig. 3, step 400 of the method for regulating and controlling a secondary network of a heat exchange station of the present invention includes:
step 401: acquiring a valve characteristic curve of a secondary network regulating and controlling valve;
in this step, a valve characteristic curve can be obtained from a valve product manual or a supplier according to the type of the secondary network regulating and controlling valve.
Step 402: acquiring physical structure characteristics of a secondary network;
the secondary network in this step includes various physical structural characteristics, such as: the worst loop, the heat dissipation setting, the position of the control valve, the number of the control valves, and the like, in this embodiment, the desired physical structural characteristics can be obtained according to the needs, and are not particularly limited herein.
Step 403: and calculating according to the valve characteristic curve of the secondary network regulating and controlling valve, the return water temperature control error and the physical structure characteristic of the secondary network to obtain the opening change numerical value of the secondary network regulating and controlling valve.
In this step, the valve characteristic curve of the secondary network regulating and controlling valve, the return water temperature control error and the physical structure characteristic of the secondary network can be sent to an intelligent cloud platform or a computer to calculate the opening change value of the secondary network regulating and controlling valve.
The opening change value of the secondary network regulating and controlling valve is calculated as follows:
according to the network structure of the secondary network, the secondary network is divided into three parts according to the distance from the heat exchange station: front, middle and end.
When the secondary network regulating and controlling valve is positioned at the front end of the heat exchange station, the opening change numerical value of the secondary network regulating and controlling valve is as follows:
when e > is 10, dV is 40% - - - (3)
When-10 < e <10, dV ═ 0.0063e ^3+3.3465e (%) - - - (4)
When e < - > -10, dV < - > - - (5)
When the secondary network regulating and controlling valve is positioned at the middle end of the heat exchange station, the opening change numerical value of the secondary network regulating and controlling valve is as follows:
when e > is 10, dV is 30% - - - (6)
When-10 < e <10, dV ═ 0.0063e ^3+2.3465e (%) - - - (7)
When e < - > -10, dV < - > - - (8)
When the secondary network regulating and controlling valve is positioned at the tail end of the heat exchange station, the opening change numerical value of the secondary network regulating and controlling valve is as follows:
when e > is 10, dV is 20% - - - (9)
When-10 < e <10, dV ═ 0.0048e ^3+1.5162e (%) - - - (10)
When e < - > -10, dV < - > - - (11)
And e is a return water temperature control error, and dV is an actual opening change value of the secondary network regulating and controlling valve.
The specific relation characteristic curve of the opening change numerical value of the secondary network regulating and controlling valve and the return water temperature control error is shown in fig. 8.
According to the method for regulating and controlling the secondary network of the heat exchange station, disclosed by the embodiment of the invention, the opening change numerical value of the secondary network regulating and controlling valve can be calculated through an intelligent cloud platform or a computer, and various factors such as the valve characteristic curve of the secondary network regulating and controlling valve, the return water temperature control error, the physical structure characteristic of the secondary network and the like participate in calculation, so that the opening change numerical value of the secondary network regulating and controlling valve is more accurate to determine, and the control accuracy of the thermal and hydraulic balance of the secondary network and a heat consumer is further improved.
Optionally, in the method for adjusting and controlling the secondary network of the heat exchange station according to the embodiment of the present invention, the physical structure characteristics of the secondary network include the worst loop, a heat dissipation device, and an adjustment and control valve position.
In some embodiments, referring to fig. 4, the method for regulating and controlling a secondary network of a heat exchange station according to the present invention further includes, after step 500:
step 600: obtaining an actual opening change value of a secondary network regulating and controlling valve after the waiting preset time is determined according to a user heat dissipation device;
step 700: and if the actual opening change value of the secondary network regulating and controlling valve meets the preset valve opening change condition, regulating and controlling the secondary network regulating and controlling valve.
After the regulation and control of the secondary network regulation and control valve of the heat exchange station are completed, the method needs to wait for a certain time (for example, 2 and 4 hours when a heat user is a radiator and a floor heater respectively), and judges the water balance state of the secondary network based on the return water temperature by regulating and controlling the actual opening change value of the valve: (1) when the opening change condition of the regulating valve is met, the secondary network is in a hydraulic balance state, and debugging is completed; (2) when the condition of regulating and controlling the opening degree of the valve is not met, the secondary network needs to be continuously regulated, the work of the steps 100-700 is repeated until the condition of judging the opening degree change of the regulating and controlling valve is met, the hydraulic balance of the secondary network is realized, and then after the working condition of hydraulic balance of the secondary network is realized, the regulating and controlling valve of the thermal power inlet of the building/unit is locked, and the opening degree is kept unchanged. According to the secondary network regulation and control method of the heat exchange station, the quality regulation of the secondary network is realized through the heat exchange station, the station-network-user linkage regulation is realized, and the heat consumption and the power consumption of the heat exchange station are lowest on the premise of meeting the heat supply quality of a heat user.
Optionally, in the method for adjusting and controlling a secondary network of a heat exchange station according to the embodiment of the present invention, the preset valve opening variation condition is that the opening variation range of the secondary network adjusting and controlling valve is between [ -3% and 3% ].
According to the secondary network regulation and control method of the heat exchange station, the preset valve opening change condition, namely the return water temperature control error, is judged by regulating and controlling the valve opening change numerical value, when the opening change range of each secondary network regulation and control valve is +/-3%, the hydraulic balance of the secondary network can be considered to be achieved, and otherwise, the calculation and regulation are carried out again aiming at the heat power inlet which does not meet the judgment condition until the judgment condition is met. The opening variation range of the secondary network control valve may be other values, and may be set as required.
On the other hand, referring to fig. 5, an embodiment of the present invention further provides a heat exchange station secondary network regulation and control system, including a cloud platform 10 and a communication terminal 20, where the heat exchange station secondary network regulation and control system further includes a secondary network regulation and control valve 30, a return water temperature collector 40, and an indoor temperature collector 50;
the return water temperature collector 40 is used for acquiring return water temperature detection values of the secondary network and return water temperatures of a plurality of intermediate units of the secondary network;
the indoor temperature collector 50 is used for acquiring an indoor temperature detection value;
the communication terminal 20 is used for sending the temperature data acquired by the backwater temperature collector 40 and the indoor temperature collector 50 to the cloud platform 10 and receiving the control information of the secondary network regulating and controlling valve sent by the cloud platform 10;
the cloud platform 10 is used for calculating according to the temperature data and the secondary network physical parameters sent by the communication terminal 20 to obtain secondary network regulation and control valve control information;
the secondary network regulating and controlling valve 30 is used for regulating the valve opening according to the control information of the secondary network regulating and controlling valve;
and the control information of the secondary network regulating and controlling valve comprises an opening change numerical value of the secondary network regulating and controlling valve.
The cloud platform provided by the embodiment of the invention can receive temperature data acquired by the return water temperature collector and the indoor temperature collector in real time, then calculate the control set value of the return water temperature of the secondary network, compare the control error with the return water temperature, and finally calculate the opening value required by the field regulating valve by combining the type of the field application valve and other input data, so that the communication terminal obtains the required regulating requirement and carries out field manual regulation or automatic intelligent regulation.
The heat exchange station secondary network regulation and control system of the embodiment of the invention firstly obtains temperature data (a secondary network backwater temperature detection value and an indoor temperature detection value) through a backwater temperature collector and an indoor temperature collector, then sends the temperature data and the indoor temperature detection value to a cloud platform through a communication terminal, the cloud platform calculates according to the temperature data and physical parameters of a secondary network to obtain secondary network regulation and control valve control information, namely an opening degree change numerical value of a secondary network regulation and control valve, and finally the secondary network regulation and control valve regulates the opening degree of the secondary network according to the secondary network regulation and control valve control information, so that the opening degree of the secondary network regulation and control valve is set at a proper position, the problem of unbalance of the heat balance and the water balance of the secondary network and a heat user of the heat exchange station is regulated and solved, the heat balance degree and the water balance and the control precision of the secondary network and the heat user are improved, necessary conditions are, the system free heat is fully utilized, the system energy consumption and pollutant emission are reduced, and the labor cost and the labor intensity are reduced.
Preferably, the secondary grid regulating and controlling valve 30 of the heat exchange station secondary grid regulating and controlling system according to the embodiment of the present invention is a manual regulating valve.
In recent years, part of heating power companies adopt an intelligent secondary network control system based on a cloud platform, and a control valve and data acquisition and transmission equipment are powered by an external power supply, but field power taking is very difficult due to various reasons, so that the development of an intelligent control secondary network is hindered. Even if the battery is used for driving, the application and popularization of the intelligent control system of the secondary network are greatly influenced due to the influences of factors such as the capacity of the battery, the volume of the battery, the installation position, the environmental limit, the service life and the like. The heat exchange station secondary network regulation and control system provided by the embodiment of the invention can greatly reduce the initial investment of the secondary network intelligent control system, only the most main parts, namely the manual regulating valve, the cloud platform and the return water temperature collector are installed, and the manual regulating valve does not need electricity, so that the difficulty of on-site electricity taking is further reduced, and the development of the intelligent control secondary network is promoted. It should be noted that the type of the secondary network regulating valve in this embodiment may be ZKF-DN50/PN16, as long as the regulating valve function of the present invention can be realized, which is not illustrated herein.
Optionally, the return water temperature collector 40 of the heat exchange station secondary grid regulation and control system according to the embodiment of the present invention is integrated in the valve body of the secondary grid regulation and control valve 30.
Preferably, the model of the return water temperature collector of the heat exchange station secondary network regulation and control system in the embodiment of the present invention may be NB-IoT, and of course, other types of return water temperature collectors may also be used, which are not illustrated herein.
Preferably, the return water temperature collector of the heat exchange station secondary grid regulation and control system in the embodiment of the invention is detachably arranged in the valve body of the secondary grid regulation and control valve. The heat exchange station secondary network regulation and control system provided by the embodiment of the invention adopts the detachable secondary water return temperature collector, can realize plug and play, and can be reused in another heat exchange station secondary network after the heat exchange station secondary network and the heat user are balanced in heat and water power.
In the secondary network regulation and control system of the heat exchange station of the embodiment of the invention, the secondary network regulation and control valve arranged at the thermal power inlet can be a plane hard seal balance valve and a W-shaped ball valve), and the return water temperature collector is integrated in the valve body, and the specific structure chart is shown in fig. 6 and 7. In fig. 6: 1-a protection device; 2-a dial scale; a 3-NB-IoT temperature sensor; 4-an isolation sleeve; 5-a planar open type valve core; 6-valve seat; 7-valve body. In fig. 7: 1' -a protection device; 2' -dial scale; a 3' -NB-IoT temperature sensor; 4' -a spacer sleeve; 5' -W open type valve core; 6' -a valve seat; 7' -valve body.
Specifically, when the heat exchange station secondary network regulation and control system provided by the embodiment of the invention performs regulation and control, firstly, parameters are input in a cloud platform, and the method comprises the following steps: the number of a control valve, the installation position of the control valve, the position of a unit, a basic set value of return water temperature, a corrected value of indoor temperature, a control set value of return water temperature, a detected value of indoor temperature, a detected value of return water temperature, a temperature difference of return water temperature and the position of the control valve in a secondary network; and the output parameters of the cloud platform comprise: the method comprises the steps of controlling valve number, controlling valve installation position, controlling valve opening change value, presetting valve opening change condition (hydraulic balance judgment condition), controlling state and controlling valve adjusting angle (operation debugging personnel can debug the field device according to the 'state' and 'valve adjusting angle' of output parameters).
For specific examples see the following table: the first table is an input parameter list, the second table is an output parameter list, and the third table is the return water temperature of the intermediate unit and the non-intermediate unit.
Table one:
table two:
table three:
the communication terminal can be a mobile terminal and is developed as follows:
1. mobile phone APP (android system + apple system)
1.1 input interface
The following parameters can be obtained according to the secondary network general plane diagram and the actual operation condition:
(1) the acquisition update time is input (1-120 minutes can be set on the interface) and the input parameters are as follows: the number of a control valve, the installation position of the control valve, the position of a unit, a basic set value/DEG C of return water temperature, a corrected value/DEG C of indoor temperature and the position of the control valve in a secondary network;
(2) obtaining a return water temperature control set value and a return water temperature control error through intelligent calculation of a cloud platform;
(3) and acquiring a return water temperature detection value and an indoor temperature detection value through the cloud platform.
1.2 output interface
Giving a list of output parameters, the output parameters are as follows:
the control valve comprises a control valve number, a control valve installation position, a unit position, a control valve opening change numerical value, a preset valve opening change condition, a control state and a control valve adjustment angle.
2. Portable computer
Through the remote link of surfing the internet, a given website can be logged in under the permission of the authority, a website with the same function as the mobile phone is accessed, secondary network intelligent balance calculation is carried out, and the adjusting parameters are obtained.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method for regulating and controlling a secondary network of a heat exchange station is characterized by comprising the following steps:
acquiring a secondary network backwater temperature detection value and an indoor temperature detection value;
calculating a secondary network return water temperature control set value according to the indoor temperature detection value and the secondary network non-intermediate unit return water temperature correction value;
comparing the secondary network return water temperature control set value with the secondary network return water temperature detection value to obtain a return water temperature control error;
calculating the opening change value of the secondary network regulating and controlling valve according to the return water temperature control error and the physical parameters of the secondary network;
and adjusting the opening of the secondary network regulating and controlling valve according to the opening change value of the secondary network regulating and controlling valve.
2. The method for regulating and controlling the secondary network of the heat exchange station according to claim 1, wherein the step of calculating the control set value of the return water temperature of the secondary network according to the detected indoor temperature value and the corrected value of the return water temperature of the non-intermediate unit of the secondary network comprises the steps of:
acquiring return water temperatures of a plurality of intermediate units of the secondary network;
calculating to obtain a secondary network middle unit backwater temperature average value according to the obtained backwater temperatures of the multiple middle units of the secondary network, and taking the secondary network middle unit backwater temperature average value as a secondary network backwater temperature basic set value;
and determining the control set value of the return water temperature of the secondary network according to the indoor temperature detection value, the basic set value of the return water temperature of the secondary network, the corrected value of the return water temperature of the non-intermediate unit of the secondary network, the corrected value of the indoor temperature of the intermediate unit of the secondary network and the corrected value of the indoor temperature of the non-intermediate unit of the secondary network.
3. The method for regulating and controlling the secondary network of the heat exchange station according to claim 1, wherein the step of calculating the opening change value of the secondary network regulating and controlling valve according to the return water temperature control error and the physical parameters of the secondary network comprises the following steps:
acquiring a valve characteristic curve of the secondary network regulating and controlling valve;
acquiring the physical structure characteristics of the secondary network;
and calculating according to the valve characteristic curve of the secondary network regulating and controlling valve, the return water temperature control error and the physical structure characteristic of the secondary network to obtain the opening change numerical value of the secondary network regulating and controlling valve.
4. The method according to claim 3, wherein the physical structural characteristics of the secondary mesh include worst-case loops, heat sinks, and regulating valve positions.
5. The heat exchange station secondary network regulating and controlling method according to claim 1, wherein the step of regulating the opening degree of the secondary network regulating and controlling valve according to the opening degree variation value of the secondary network regulating and controlling valve is further followed by the steps of:
obtaining an actual opening change value of the secondary network regulating and controlling valve after the waiting preset time is determined according to a user heat dissipation device;
and if the actual opening change value of the secondary network regulating and controlling valve meets the preset valve opening change condition, the regulation and control of the secondary network regulating and controlling valve are completed.
6. The heat exchange station secondary network regulation and control method according to claim 5, wherein the preset valve opening variation condition is that the opening variation range of the secondary network regulation and control valve is between [ -3% and 3% ].
7. A heat exchange station secondary network regulation and control system comprises a cloud platform and a communication terminal, and is characterized by further comprising a secondary network regulation and control valve, a return water temperature collector and an indoor temperature collector;
the return water temperature collector is used for acquiring return water temperature detection values of the secondary network and return water temperatures of a plurality of intermediate units of the secondary network;
the indoor temperature collector is used for acquiring an indoor temperature detection value;
the communication terminal is used for sending the temperature data acquired by the return water temperature collector and the indoor temperature collector to the cloud platform and receiving the control information of the secondary network regulating and controlling valve sent by the cloud platform;
the cloud platform is used for calculating according to the temperature data sent by the communication terminal and the physical parameters of the secondary network to obtain control information of the secondary network regulating and controlling valve;
the secondary network regulating and controlling valve is used for regulating the valve opening according to the control information of the secondary network regulating and controlling valve;
and the control information of the secondary network regulating and controlling valve comprises an opening change numerical value of the secondary network regulating and controlling valve.
8. The heat exchange station secondary grid regulation and control system of claim 7, wherein the secondary grid regulation and control valve is a manual regulation valve.
9. The heat exchange station secondary grid regulation and control system of claim 7, wherein the return water temperature collector is integrated in a valve body of the secondary grid regulation and control valve.
10. The heat exchange station secondary network regulation and control system of claim 9, wherein the return water temperature collector is detachably arranged in the valve body of the secondary network regulation and control valve.
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| CN113028493A (en) * | 2021-03-16 | 2021-06-25 | 西安交通大学 | Online matching and adjusting method for heating load and heat demand of regional heating system |
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