CN104482593A - Intelligent control method of water/water heat exchange station - Google Patents
Intelligent control method of water/water heat exchange station Download PDFInfo
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- CN104482593A CN104482593A CN201410818503.XA CN201410818503A CN104482593A CN 104482593 A CN104482593 A CN 104482593A CN 201410818503 A CN201410818503 A CN 201410818503A CN 104482593 A CN104482593 A CN 104482593A
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Abstract
The invention belongs to the field of automatic control of heat exchange stations, and particularly relates to an intelligent control method of a water/water heat exchange station suitable for water/water heat exchange. The method is implemented according to the following steps: a, initializing a system; b, performing data acquisition; c, performing data analysis and processing; d, performing alarm judgment processing; e, performing remote control; f, receiving a dispatching instruction and operating in combination with in-situ parameters if so, and otherwise, calling expert data and performing an automatic control algorithm; g, outputting a control command; h, updating a database; i, packing and uploading the data; j, displaying update; k, returning to the step b. According to the method, the opening of an adjusting valve in the heat exchange station, the opening and closing of an electromagnetic valve and the operation state of a frequency converter can be automatically controlled, and the heat supply quality is improved.
Description
Technical field
The invention belongs to heat exchange station automation field, particularly relate to a kind of water/water heat exchange station intelligent control method being applicable to water/water heat exchange.
Background technology
From the fifties, China starts to carry out central heating, up to the present central heating system has substantially all been built at county level and above city, central heating system is made up of heating plant and the heat exchange station be distributed in each heating community, be characterized in that thermal source can be relatively concentrated in a large-scale heating plant, and each user community only needs construction heat exchange station just can complete heating, thus eliminate with serious pollution miniature boiler room, but with promoted extension and development speed incompatible be, the control technology of heating system is also very backward, especially the control mode of heat exchange station equipment falls behind, heat exchange station thermal losses is large, heating quality is poor, the thermal efficiency being mainly manifested in heating system is low, heat supply network is uneven, the zones of different temperature difference is large, this just causes mass energy to waste, also be the key factor increasing the weight of atmosphere pollution.
For improving the heating quality of heating system, must improve the level of control of heat exchange station, heat exchange station is used in heating system changing heating medium, controls and the distribution of metering heating medium and parameter, directly supply the facility of user's heat.Under traditional mode, heat exchange station equipment operational factor oneself to be decided by on-the-spot operator on duty or operational order that scheduled central dispatching personnel send sets, regulate, equipment running status is completely by the ability of operating personnel, quality determines, this can only reach the object of coarse adjustment, easily cause and the fluctuation of a secondary net is impacted, be unfavorable for guarantee one secondary net dynamic thermal balance, for a secondary net temperature, the fluctuation of pressure, Automatic adjusument can not be carried out in real time, and the change of following outdoor temperature cannot be realized, regulate the water supply/return water temperature of secondary network, all of these factors taken together causes the heating quality being difficult to ensure user, in addition, these personnel that also cause waste.
Summary of the invention
The present invention is intended to overcome the weak point of existing water/water heat exchange station control technology and provides one can arrange long-range, Work in Place pattern on demand, the aperture of control valve in automatic control heat exchange station, the opening and closing of magnetic valve, the running status of frequency converter and operating frequency, and then the heat exchange amount of heat exchanger in control heat exchange station, and send metastable water supply/return water temperature, pressure for user, reduce thermal losses, improve the water/water heat exchange station intelligent control method of heating quality.
For solving the problems of the technologies described above, the present invention realizes like this.
Water/water heat exchange station intelligent control method, can implement as follows:
A, system initialization;
B, carry out data acquisition;
C, data analysis and process;
D, alarm decision process;
E, carry out Long-distance Control;
F, if so, accept dispatch command and combine parameter on the spot and carry out computing; If not, expert data is called and automatic control algorithm;
G, output control command;
H, database update;
The packing of i, data is uploaded;
J, display update;
K, be back to step b.
As a kind of preferred version, data in step b of the present invention comprise parameters such as once netting water supply/return water temperature, pressure, flow, control valve opening, secondary network water supply/return water temperature, pressure, outdoor temperature, water supply tank water level, supplementing water pressure, circulating pump/small pump frequency converter operating frequency and state.
Intelligent controller of the present invention (RTU) to have with remote scheduling computer by wireless GPRS communication function and shows on the spot, operating function, can by measurement parameters all in this heat exchange station: a secondary net water supply/return water temperature, pressure, flow, the parameters such as control valve opening, secondary network water supply/return water temperature, pressure, outdoor temperature, water supply tank water level, supplementing water pressure, circulating pump/small pump frequency converter operating frequency, the signals such as state, can calculate with hour/day/month wait as the integrated flow of measurement unit, accumulative heating load, being furnished with touch-screen can artwork, form, the various forms such as curve show these parameters and state, also these parameters and state can be sent to dispatching.RTU of the present invention has the long-range operating parameter setting of acceptance and automatically reconciles two kinds of mode of operations according to outdoor temperature on the spot, under remote mode, can accept dispatching operational order and in conjunction with our station actual conditions, based on a secondary net thermal balance, ensure the controlling run parameter improving our station for the purpose of secondary network water supply/return water temperature, pressure; And under Work in Place pattern, RTU is by heating temperature, the pressure index according to setting, with reference to the situation of change of outdoor temperature, automatic conciliation is from the received heat of a secondary net, and the equipment such as secondary network circulating pump, small pump, relief valve, communicating valve that automatically control ensure stable water supply/return water temperature, pressure.No matter under which kind of mode of operation, RTU can according to built-in expert system software, the different brackets such as coarse adjustment, fine tuning is divided to carry out the control task automatically completing each equipment in heat exchange station reposefully, contemplate between distinct device simultaneously and whether be applicable to the frequent characteristic reconciled, so just can under the prerequisite ensureing heating index, the maintenance of minimizing equipment, the service life of extension device.
Water of the present invention/water heat exchange station intelligent control method has following features.
1, unique control algolithm, the record of controller inside has heat enthalpy value table, automatically can calculate the heat enthalpy value of heating load according to the temperature of supply water temperature and backwater and flow in algorithm, flow control valve and distributed frequency conversion two kinds of control models are also divided into the regulative mode of a secondary net flow, expand the scope of application of RTU.The situation of Flow-rate adjustment valve regulation is installed for a secondary net, adds the control mode that time delay combines with threshold decision in algorithm, avoid the frequent operation repeatedly to control valve, extend the service life of control valve.
2, for batch (-type) heating situation, circulating pump heat be give also to secondary network pressure of return water and run the supplementing water pressure setting value different from secondary network during cold stopping, thus when avoiding single setting value, during cold stopping, pressure reduces needs moisturizing, when running with heat, because temperature elevation amplitude is large, build-up of pressure raises and wants the illusion of pressure release, by judging heat supply network state, under different conditions, computing adopts different pressure set points, avoid cold stopping pressure reduce and moisturizing and heat run time pressure raise and sluice situation occur, therefore saved great lot of water resources and decreased thermal losses.
3, considering that water storage box water level is too low cannot to emergency during secondary network moisturizing, in order to ensure heat supply network pressure of supply water, devise and can select coupling cock is installed between a secondary net and secondary network, when above-mentioned secondary network cannot moisturizing, in order to ensure secondary network pressure, automatically can open the communicating valve of this secondary net and secondary network, make up the lack of water undervoltage condition of secondary network with the water of a secondary net in time.
4, every platform RTU can control the heat-exchange unit in two regions, to adapt to the heat exchange station requirement with two kinds of different heating index requests, as to the heat exchange station being divided into high district and low district and need sending different pressures; The small pump control mode of a dual-purpose standby circulating pump control mode and the using and the reserved can be provided at most for each heat-exchange unit, make that RTU is with better function, the scope of application is wider.
5, there is multiple chain function, as chain in small pump and cistern water level, relief valve, communicating valve etc., protect heat exchange station equipment, the contradiction brought between the equipment that avoids runs.
6, there is abundant display frame, a secondary net medium entry/exit temperature, pressure, flow, calorific value is shown with the different interface manner such as process curve, data form, rod figure, curve, secondary network water supply/return water temperature, pressure, and the measurement parameter such as water supply tank water level, outdoor temperature, frequency converter operating frequency, show each frequency converter, water pump, control valve, the state of the equipment such as magnetic valve simultaneously.
7, there is friendly human-computer interaction interface; by the upper button of point touching screen; this RTU is selected to be operated in remote scheduling pattern and automatic control mode on the spot easily; all control appliances (frequency converter, water pump, control valve, magnetic valve etc.) automatically can controlled and switching between manual control mode; also can to pressure of supply water, pressure of return water, transfinite and setting of reporting to the police for parameters such as poor, the cistern water levels of pressure of return water; modification item can work out the password of different protection class to these simultaneously, avoid the maloperation of unauthorized personnel.
8, there is multi-level, multi-form warning and defencive function, sound and light alarm on the spot can be provided by the controling parameters important to some, and by warning message teletransmission to dispatching, those ultralimit can be reported to the police, necessary emergent and conservation treatment can be carried out.
9, have GPRS communication function, communications protocol adopts standard MODBUS agreement, and communication speed is 19.2K, can conveniently by our station data upload to dispatching.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the invention will be further described.Protection scope of the present invention will not only be confined to the statement of following content.
Fig. 1 is program flow chart of the present invention.
Fig. 2 is intelligent controller of the present invention (RTU) inner theory diagram.
Fig. 3 is water of the present invention/water heat exchange control system theory diagram.
Fig. 4 is pressure detection circuit module principle figure of the present invention.
Fig. 5 is temperature sensing circuit module principle figure of the present invention.
Fig. 6 is power circuit block schematic diagram of the present invention.
In figure: 1, heat exchange station intelligent controller; 2, a secondary net; 3, secondary network; 4, a secondary net return pipe flow control valve; 5, a secondary net return pipe flowmeter; 6, a secondary net feed pipe temperature transmitter; 7, a secondary net return pipe temperature transmitter; 8, a secondary net feed pipe pressure transmitter; 9, a secondary net return pipe pressure transmitter; 10, secondary network feed pipe temperature transmitter; 11, secondary network return pipe temperature transmitter; 12, secondary network feed pipe pressure transmitter; 13, secondary network return pipe pressure transmitter; 14, fluid level transmitter; 15, outdoor temperature transmitter; 16, the first circulating pump; 17, the second circulating pump; 18, the first small pump; 19, the second small pump; 20, secondary network return pipe relief valve; 21, communicating valve.
Detailed description of the invention
As shown in Figure 1, water/water heat exchange station intelligent control method, can implement as follows:
A, system initialization;
B, carry out data acquisition;
C, data analysis and process;
D, alarm decision process;
E, carry out Long-distance Control;
F, if so, accept dispatch command and combine parameter on the spot and carry out computing; If not, expert data is called and automatic control algorithm;
G, output control command;
H, database update;
The packing of i, data is uploaded;
J, display update;
K, be back to step b.
Data in step b of the present invention comprise parameters such as once netting water supply/return water temperature, pressure, flow, control valve opening, secondary network water supply/return water temperature, pressure, outdoor temperature, water supply tank water level, supplementing water pressure, circulating pump/small pump frequency converter operating frequency and state.
Shown in Figure 2, heat exchange station intelligent controller, it comprises
cPU, digital quantity I/O (band isolation auxiliary reclay), analog input/output (band signal isolator), GPRS communication module, touch-screen and power module; Described
cPUon each generic port correspondingly with the PORT COM of digital quantity input/output end port, analog input/output port, GPRS module and touch-screen respectively to connect; Described touch-screen in order to show monitoring parameter and the equipment working state of a secondary net and secondary network, and can switch between control mode at remote controlled manner and on the spot, provides warning and cipher protection function; System data is uploaded to dispatching by described GPRS communication module; Power module provides working power for system.
Shown in Figure 3, water/water heat exchange station control system, it comprises heat exchange station intelligent controller, a secondary net and secondary network control appliance.
Described heat exchange station intelligent controller comprises
cPU, digital quantity I/O (band isolation auxiliary reclay), analog input/output (band signal isolator), GPRS communication module, touch-screen and power module; Described
cPUon each generic port correspondingly with the PORT COM of digital quantity input/output end port, analog input/output port, GPRS module and touch-screen respectively to connect; Described touch-screen in order to show monitoring parameter and the equipment working state of a secondary net and secondary network, and can switch between control mode at remote controlled manner and on the spot, provides warning and cipher protection function; System data is uploaded to dispatching by described GPRS communication module; Power module provides working power for system.
Described
cPUdigital quantity input/output end port through isolation auxiliary reclay connect with the control appliance of one secondary net/secondary network; Described
cPUanalog input/output port connect with one secondary net/secondary network transmitter, control appliance through signal isolator.
A secondary net link block of the present invention comprises the pressure transmitter 9 on temperature transmitter 7, the secondary net return pipe on flowmeter 5, the secondary net return pipe on pressure transmitter 8, the secondary net return pipe on temperature transmitter 6, the secondary net feed pipe on a secondary net feed pipe and the flow control valve 4 on a secondary net return pipe.
Secondary network link block of the present invention comprises temperature transmitter 11, the pressure transmitter 13 on secondary network return pipe and the relief valve 20 on secondary network return pipe on the temperature transmitter 10 on secondary network feed pipe, the pressure transmitter 12 on secondary network feed pipe, secondary network return pipe.
The present invention also comprises communicating valve 21; The signal port of described communicating valve 21 connects the signal port of heat exchange station intelligent controller.
The present invention also comprises fluid level transmitter 14; The signal port of described fluid level transmitter 14 connects the signal port of heat exchange station intelligent controller.
The present invention also comprises outdoor temperature transmitter 15; The signal port of described outdoor temperature transmitter 15 connects the signal port of heat exchange station intelligent controller.
The present invention also comprises 1# circulating pump frequency converter 16,2# circulating pump frequency converter 17; The signal port of described room 1# circulating pump frequency converter 16,2# circulating pump frequency converter 17 connects the signal port of heat exchange station intelligent controller.
The present invention also comprises 1# small pump frequency converter 18,2# small pump frequency converter 19; The signal port of described room 1# small pump frequency converter 18,2# small pump frequency converter 19 connects the signal port of heat exchange station intelligent controller.
Controller of the present invention can arrange long-range on demand, Work in Place pattern, by the temperature of thermal medium in a secondary net in collection heat exchange station and secondary network, pressure, flow, the running status of heat exchange station equipment, the liquid level of water storage box, the parameters such as outdoor temperature, through the optimization computing of the built-in expert system software of RTU, automatically the aperture of control valve in heat exchange station is controlled, the opening and closing of magnetic valve, the running status of frequency converter and operating frequency, under the prerequisite that a secondary net dynamic thermal balance is stablized in reference, the heat exchange amount of heat exchanger in heat exchange station can be controlled according to objective reality situations such as weather, and then calculate water supply/return water temperature that secondary network should send, force value, for user sends stable water supply/return water temperature, pressure object, the duty of heat exchange station equipment and heating index is made all to reach optimum state, reduce thermal losses and improve heating quality.
Heat exchange station intelligent controller (RTU) of the present invention is the basis forming heating system DCS system (dcs).DCS system is made up of the department of computer science being located at control centre of the Thermal Corp RTU be located in each heat exchange station that unifies, continuous print data communication can be kept between dispatching and each RTU, the Mathematical Modeling of a secondary net dynamic thermal balance is had in dispatching software, it can according to each heat exchange station RTU to the demand of heating load, carry out the quantity of heat production that control of heat source factory is total, keep the dynamic thermal balance of heat source mesh (secondary net) by the heat distribution of each RTU of dynamic coordinate simultaneously.RTU is as the on-the-spot working control unit of whole heating control system, automatically control the heat exchange amount of heat exchanger according to outdoor temperature situation of change in each heat exchange station, automatically control heat exchange station internal circulation pump simultaneously, small pump, relief valve, the equipment such as coupling cock, keep secondary network water supply/return water temperature, pressure meets heating requirement, and keep relative stablizing, therefore, RTU is the basis forming whole heating network control system, whether RTU design is reasonable, whether function is complete, whether work is stable directly will affect heating effect, the Fundamentals determining heating quality.
See Fig. 2, heat exchange station intelligent controller RTU of the present invention comprise CPU, communication interface, digital-quantity output interface, digital-quantity input interface, analog output interface circuit, analog input interface, digital quantity I/O isolation auxiliary reclay, analog input/output signal isolator, GPRS communication module, touch-screen and 24V power supply.
Shown in Figure 3, when being applied in water/water heat exchange type heat exchange station, need the equipment such as Measurement for Inverter, pump, valve connected.Wherein, intelligent controller 1 is connected with secondary net feed pipe temperature transmitter 6, secondary net feed pipe pressure transmitter 8, the secondary net return pipe flowmeter 5 be arranged in a secondary net 2 on feed pipe and a secondary net return pipe temperature transmitter 9 by double core shielding cable; Be connected with the secondary net return pipe flow control valve 4 be arranged on return pipe by two double core shielding cables.
Intelligent controller of the present invention can according to the measurement of these network parameters, judge the duty of a secondary net, judge whether heat-exchange unit blocks by the pressure of water supply/backwater, and the heat exchange amount of heat-exchange unit can be calculated by the temperature difference of water supply/backwater and flow, the flow control valve be arranged on return pipe can be regulated to change heat exchange amount according to heating load conditions of demand, and then change exerting oneself of heat exchange station.
Heat exchange station intelligent controller 1 is connected with the secondary network return pipe temperature transmitter 11 on the secondary network feed pipe temperature transmitter 10 be arranged in secondary network 3 on feed pipe, secondary network feed pipe pressure transmitter 12, return pipe and secondary network return pipe pressure transmitter 13 by double core shielding cable; Be connected with the secondary network relief valve be arranged on return pipe by a quad.
Heat exchange station supply water temperature and return water temperature are the important indicators determining heating effect, especially return water temperature should control more than certain numerical value, being the major parameter that heat exchange station intelligent controller 1 will control, and keeping certain pressure of supply water and pressure of return water, is the important leverage ensureing that pipe network is unimpeded.
Heat exchange station intelligent controller 1 by double core shielding cable and the fluid level transmitter 14 be located in water tank be located at outdoor outdoor temperature transmitter 15 and be connected, by a quad be connected across a secondary net 2 and be connected with the communicating valve 21 between secondary network 3.
Grasping outdoor temperature, be that intelligent controller calculates and controls the foundation that heat exchange station confesses heat, and cistern water level is the necessary condition chain with small pump duty.
To being provided with the 1# circulating pump 16 of frequency converter, 2# circulating pump 17,1# small pump 18 and 2# small pump 19, heat exchange station intelligent controller 1 and every platform frequency converter need to be connected by additional two double core shielding cables of seven core cable.And for not installing circulating pump, the small pump of frequency converter, every platform pump and heat exchange station intelligent controller 1 needs seven core cable is connected.By connecting, heat exchange station intelligent controller 1 by measuring necessary parameter and state, ensures the safety of equipment, stable operation while carrying out controlling to export to the equipment such as frequency converter, pump.Fig. 4 is pressure detection circuit module principle figure of the present invention; Fig. 5 is temperature sensing circuit module principle figure of the present invention; Fig. 6 is power circuit block schematic diagram of the present invention; Fig. 1 is the software flow pattern of controller of the present invention.
Be understandably, above about specific descriptions of the present invention, the technical scheme described by the embodiment of the present invention is only not limited to for illustration of the present invention, those of ordinary skill in the art is to be understood that, still can modify to the present invention or equivalent replacement, to reach identical technique effect; Needs are used, all within protection scope of the present invention as long as meet.
Claims (2)
1. water/water heat exchange station intelligent control method, is characterized in that, implements as follows:
A, system initialization;
B, carry out data acquisition;
C, data analysis and process;
D, alarm decision process;
E, carry out Long-distance Control;
F, if so, accept dispatch command and combine parameter on the spot and carry out computing; If not, expert data is called and automatic control algorithm;
G, output control command;
H, database update;
The packing of i, data is uploaded;
J, display update;
K, be back to step b.
2. water according to claim 1/water heat exchange station intelligent control method, it is characterized in that: the data in described step b comprise parameters such as once netting water supply/return water temperature, pressure, flow, control valve opening, secondary network water supply/return water temperature, pressure, outdoor temperature, water supply tank water level, supplementing water pressure, circulating pump/small pump frequency converter operating frequency and state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410818503.XA CN104482593A (en) | 2014-12-25 | 2014-12-25 | Intelligent control method of water/water heat exchange station |
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| CN201410818503.XA CN104482593A (en) | 2014-12-25 | 2014-12-25 | Intelligent control method of water/water heat exchange station |
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| CN104482593A true CN104482593A (en) | 2015-04-01 |
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| CN201410818503.XA Pending CN104482593A (en) | 2014-12-25 | 2014-12-25 | Intelligent control method of water/water heat exchange station |
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| CN104965531A (en) * | 2015-07-07 | 2015-10-07 | 国网上海市电力公司 | Novel water tank water level and water replenishing electromagnetic valve remote monitoring system and monitoring method |
| CN109373441A (en) * | 2018-12-20 | 2019-02-22 | 普瑞森能源科技（北京）股份有限公司 | Heat supply network energy management system and its processing method |
| CN111692625A (en) * | 2020-07-16 | 2020-09-22 | 中国建筑科学研究院天津分院 | Heat exchange station control system |
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Application publication date: 20150401 |