CN101949559A - Intelligent energy-saving mixed water heat supply method - Google Patents
Intelligent energy-saving mixed water heat supply method Download PDFInfo
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Abstract
The invention relates a mixed water heat supply system, in particular to an intelligent energy-saving mixed water heat supply method. In the invention, developed from a system adopting the conventional valve throttling distribution, a corresponding intelligent energy-saving mixed water heat supply system consists of a mixed water station intelligent balance monitoring subsystem, a computer centralized monitoring center, a video monitoring subsystem and a secondary network intelligent balance and energy-conservation monitoring subsystem; and the operation optimization and energy conservation of the entire mixed water heat supply system are realized by the excellent cooperation of the four subsystems.
Description
Technical field
The present invention relates to a kind of mixed water heating system, relate in particular to a kind of intelligent power saving and mix the water heat supply method.
Background technology
Existing central heating system can be divided into: thermal source direct-furnish, indirect heating and three kinds of forms of mixed water heat supply.The characteristics of indirect heating are by plate type heat exchanger, and the once net and the secondary net that will have the different pressures feature are separated, and the two does not disturb mutually in the running, realize management control and even running easily.But innately there is following limitation in the indirect heating mode: 1) efficient that need depend on plate type heat exchanger is sent in the change of heat, and this efficient in actual motion owing to reasons such as incrustation, be difficult to guarantee.Simultaneously, the resistance of secondary network operation can increase along with the deterioration of fouling of heat exchangers.2) for net once, because the demand of safety design and safe operation, adopt the method for operation of the little temperature difference of big flow, cause operation energy consumption high, and cause and be difficult to adapt to terminal use's area of heat-supply service and continue the operating condition that increases newly; 3) this mode must fully realize cogeneration of heat and power under existing operational mode, to make full use of residual heat of electric power plant, improves the thermal efficiency of power plant.But based on generating, cause fluctuating widely of central heating thermal source quality just because of this method of operation itself, can't continue to guarantee provides stable thermal output for the secondary net.Even if with the form of cogeneration of heat and power, central heating has strong dependence for primary energy.
Compare with traditional indirect heating mode, existing mixed water heating system, by once setting up the method for mixing water station between net and the secondary net, reach secondary net supply water temperature by will once netting to supply water to mix with part secondary net backwater, when exempting the employing plate type heat exchanger, make full use of the once available pressure head of net, as the part operation power of secondary net, with the force (forcing) pump of providing for oneself of secondary net, matching promotes the continuous service of secondary net.Another part in the secondary net backwater is back to thermal source as the recirculated water of once netting, and finishes the circulation of water.Mix the water heat supply from its architectural feature and compare with indirect heating, have following born advantage: 1) primary water is actually the part backwater of secondary net, and it has the big temperature difference operation characteristic of a supply water temperature secondary return water temperature; 2) for the mixed water system of stable operation, once in fact Wang quantity of circulating water is exactly this a part of water yield that refluxes from the secondary net, and it has the feature of low discharge again; 3) once net is directly used in moving the operation of secondary net, secondary network operation energy consumption thereby decline at the available pressure head of input.But, its architectural feature has also caused the born defective of mixed water heating system: 1) the once direct coupling of net and secondary net, cause the once fluctuation meeting of net directly to influence the stability of secondary network operation, that is to say that therefore this system operation control difficulty can increase sharply, this also is to cause this system to promote the bigger immediate cause of difficulty; 2) once the net pressure of return water is higher, in order to guarantee to mix carrying out smoothly of water, the secondary backwater is under the effect of dual dynamic, when guaranteeing that user's resistance is incited somebody to action, backwater pressure head need provide pressure reduction for mixing carrying out of water, cause the secondary pressure of return water to be higher than pressure of supply water one time, directly perceived going up finally can partly be wasted in this part energy in the throttling that keeps the primary water balance, also might cause the lifting of a webmaster material voltage endurance capability.
Although indirect heating and mixed water heat supply have nothing in common with each other on feature, but the two is in system's design selection process, has common problem: the 1) redundant fashion of safety design and safe operation, long-term and greatest differences between operating condition and the design conditions, cause two cover systems all to have underemployed limitation, the most situation of system operates in inefficient state; 2) continuity that the method for operation of traditional pump pressurization pipe network transmission ﹠ distribution, and operating condition changes makes system conditions hydraulic characteristic complexity, and be difficult to realize dynamic hydraulic equilibrium on the pipe network of setting.So on traditional design, operation and selection method basis, under the multi-state condition, be prerequisite with the dynamic equilibrium of pipe network, the operation optimization of realization system, be problem demanding prompt solution,, realize that energy conservation object is significant significantly reducing system's operation energy consumption.Under the major premise of energy-saving and emission-reduction, obviously mix the water heating system and have inborn advantage, even if optimize the energy saving space but this system still has higher operation in running, this also is the basic starting point of the present invention, perhaps the present invention is devoted under the dynamic hydraulically balanced prerequisite of system intelligence, the comprehensive development mixes water system operation optimal control, and not only at certain part in the system, target is that overall situation operation optimization and systematicness are energy-conservation, and with the system and method standardization that is proposed, as the foundation of product development.
Summary of the invention
The present invention be directed to and adopt the system of traditional valve throttle transmission ﹠ distribution to carry out, corresponding intelligent power saving mixes being made up of mixed water station intelligent balance Monitor And Control Subsystem, computer integrated monitoring center, video monitoring subsystem and secondary net intelligent balance energy-saving monitoring subsystem four parts of water heating system, the operation optimization of whole mixed water heating system and energy-conservation realization are to realize by good cooperation between these four subsystems.System architecture and subsystem function are described as follows:
1. mix water station intelligent balance Monitor And Control Subsystem
The function that this subsystem is embodied in continuous running mainly contains: 1) realize the mixing of once water supply and part secondary backwater, match with corresponding operation Optimal Control Strategy, control once net quantity of circulating water; 2) adopting corresponding control strategies, will once be the decoupling zero of secondary net in running, in the available pressure head that makes full use of once net, will once net the stable operation of fluctuation to the secondary net, and the influence that is produced minimizes; 3) realize changing continuously under the operating mode, the Intelligent Dynamic balance of net waterpower transmission ﹠ distribution once is with a minimized while of network operation resistance, for the operation optimization of whole system lays the foundation; 4) technological parameter that mixes water station is carried out on-line monitoring with the control parameter, and, operational factor is transferred to the computer integrated monitoring center timely and accurately, as a means of analysis, assessment and judgement by corresponding communication technology and module; 5) cooperate with the video monitoring subsystem, realize mixing the unattended function of water heating system.
For mixed water heating system, a pipe network partly is necessary for each mixed water station on the one hand provides once water supply, as the thermal resource that mixes in the water process; Mix water station on the other hand and reasonably mix water than under the condition, once the optimal control of net quantity of circulating water is to reduce once net thermal source (boiler) heat loss and transmission ﹠ distribution energy consumption.As previously mentioned, for heat supply, its corresponding operating condition is polygon, and exists than big-difference with design conditions, and under different operating modes, the realization of each mixed water station hot water transmission ﹠ distribution dynamic equilibrium is the prerequisite that all other tasks are carried out in the system in other words.The dynamic equilibrium of system also is basis of the present invention under the changeable operating mode, its realization is as shown in Figure 1, has intelligent transmission and distribution network by once on water supply and the primary water pipeline intelligent balance control valve of being developed by Hangzhou Zheda Technology Co., Ltd. being set, transmission and distribution network being upgraded to.The advantage of this valve is the sensor and the actuator that carry by valve, when flow through valve flow and pressure reduction are carried out on-line monitoring, under the control principle of appointment, by the control of valve PLC, make each branch road flow transmission ﹠ distribution balance in the system, and simultaneously under the given prerequisite of thermal source circulating pump frequency, adjusting by valve opening self, make the resistance drop minimum of system's transmission ﹠ distribution consumption on valve, in balance, realize that transmission ﹠ distribution are energy-conservation.Packing into of intelligent balance valve, make that the pairing mixed water heating system of the present invention can be according to the pattern of user's requirements set various control, the application purpose of these patterns is under the prerequisite of dynamic equilibrium, makes once the net and the secondary net degree of coupling low as far as possible, to guarantee the stable operation of secondary net.
The main adjusting parameter of field control comprises: 1) corresponding once the supply water aperture of intelligent balance control valve of water station of mixing; 2) corresponding aperture of mixing water station primary water intelligent balance control valve; 3) operating frequency of secondary pressing pump; 4) intelligence is mixed the aperture of water regulating valve.Above-mentioned four controlling units form the control loop of sealing for each mixed water station, and the parameter that is conditioned of this subitem correspondence mainly contains: the downstream pressure of the intelligent balance control valve that 1) once supplies water; 2) downstream pressure of primary water intelligent balance control valve; 3) secondary net supply head; 4) mix back secondary net supply water temperature.Mix the water station control system because the once direct coupling between net and the secondary net, the dynamic hydraulic equilibrium with primary water of must realizing simultaneously once supplying water, corresponding once confession backwater intelligent balance control valve is the important assurance of assurance system continous-stable.
This subsystem is followed following pattern in the design process of control strategy: the pressure behind its valve is controlled in the variation of the intelligent regulating valve aperture that once supplies water; The pressure before its valve is controlled in the variation of primary water intelligent regulating valve aperture; The variation control secondary user of secondary pressing pump frequency is for backwater pressure reduction; Mix the aperture control secondary water-supply temperature of water valve; Because there is certain error in intelligent balance control valve of the present invention to keeping in mind of flow, so keep the flowmeter on the primary water pipeline, cooperate with the flow of the intelligent balance control valve record that once supplies water, metering once supplies circling water flow rate poor.For this control model is to prevent because the sudden waterpower that sudden change in season or pipe-line system dehydration cause is unbalance, this subsystem is set the transmission ﹠ distribution upper limits (design conditions flow) to a water supply flow, simultaneously poor according to secondary pressure of return water and a water supply flow, the dual warning function of setting dehydration.
Under this control model, supply water temperature and flow need be made corresponding outdoor temperature compensation at changes of seasons.Under a circulating pump frequency of each compensation value condition and correspondence, adopt definite value control before the downstream pressure that once supplies water and the primary water valve.Under the temperature Compensation Strategy of correspondence, corresponding secondary pressing pump is used to guarantee corresponding secondary net supply head, to satisfy user's heat demand.In the running, mix the variation of water regulating valve aperture, guarantee that the mean value that mixes back secondary water-supply temperature or secondary return water temperature reaches the control target by intelligence.Simultaneously, by to each once supplies the record of backwater intelligent regulating valve valve position in the running, the waterpower state of respectively standing on this basis ordering is as the unified direct foundation of regulating of net once.In other words, under the big principle of the flow upper limit, carry out whole machine balancing adjusting orderly, thereby guarantee once the efficient stable operation of net under various operating modes from the least favorable station to the initial station.
In actual motion or the design process, the once exploitation of the type selecting of net corresponding intrument and control strategy can be tailored for the user under this framework according to user's demand, but must be complementary with the operation optimization of secondary net, mix the overall energy saving in running of water heating system with final realization.
2. computer integrated monitoring center
The function at computer integrated monitoring center mainly concentrates on the following aspects: receive all technological parameters that each field control station transmits, control parameter and with its centralized displaying, record and warning in the various figures, chart, curve and the tables of data that form; To control desired value or the desired value curve of respectively controlling subitem in the field control station, carry out long-range given and modification; Automatically report to the police to getting over the line parameter; Can store the historical data more than 200 days; Can generate various printing reports and operational factor curve map with needs on request; Can realize each step historical operation is write down automatically and inquires about; Thermal source is carried out metering separate, can store thermal source more than 200 days: supply the backwater water yield, supply and return water temperature, supply pressure of return water, thermal source circulating pump frequency and parameters such as power consumption, thermal source coal consumption and outdoor temperature, use the foundation that to manage and to regulate and control as thermal source; Can according to the control corresponding instruction, unify control according to emergency situations to each mixed water station.
Mainly comprise following several aspect about the upper control in computer integrated monitoring center:
1) under the prerequisite of dynamic equilibrium transmission ﹠ distribution, because the variation of two network users thermic loads may cause the current running status scarce capacity of thermal source, the problem that each mixed water station is robbed water appears;
For this class problem, taking into account system waterpower statistic data and user's importance double factor will respectively account for and carry out comprehensive differential analysis mechanisms, from upper whole system be carried out unified waterpower adjustment.If aggregate demand does not exceed the upper limit, then report to the police upper, with the realization of promotion thermal source raising frequency, and according to rank adjustment successively from high to low, ratio is regulated in running according to concrete characteristic.If exceed outside the heat supply limit of power, then press user characteristics, each station is allowed parameter (secondary water-supply temperature or for the backwater mean temperature) mechanism of adjusting of unifying to descend.
2) because the outdoor temperature burst causes the problem of heat source insufficiency;
Press user characteristics, allow parameter (secondary water-supply temperature or for the backwater mean temperature) to unify to descend and adjust mechanism at each station, can realize according to a certain percentage.
3) system's operation mixes water than optimizing;
Mixing the water heating system is a kind of newer system, and under its changeable operating mode, the optimization that mixes the water ratio is an important step guaranteeing system optimized operation.Under which type of operating mode, how many mixed water ratios reaches can make under the same secondary network users demand condition, secondary net and once net circulation is all more excellent? is the whole system operation energy consumption lower? the solution of these problems need be passed through in mixed water lines, intelligence is installed mixes water regulating valve, but utilize the feature of its flow, pressure reduction remote monitoring, by the intelligent regulator in the heat supply phase, seek the mixed water ratio of optimizing.Certainly mix determining of water ratio, need cooperatively interact with timesharing subregion of being realized at the secondary user side and the optimization of producing as required operation strategy.
4) the unified of intelligent secondary pipe network regulated;
Owing to causing the local control of secondary pipe network intelligent regulating valve door, burst reasons such as weather go wrong, when being difficult to regulate and control voluntarily, can be from the computer integrated monitoring center, long-time running monitoring result according to each arm waterpower state of secondary pipe network, according to corresponding hydraulic characteristic, carry out the same allotment of valve opening, under the major premise of whole machine balancing, can have emphasis ground to ensure special user's individual sexual demand.
3. video monitoring subsystem
For each mixed water station of having realized parameter online and the long-range system of system intelligence, its day-to-day operation again system and each valve PLC under centralized Control and the optimum organization controlled on the spot, the operation of system is according to corresponding rule substantially, in standardized category, implement automatically, remove outside the regular visit that needs, System Operation does not need manually-operated substantially.This pattern has reduced the influence of human intervention to system's operation, and each mixed water station is pressed the standard scheme construction, independent running.But as the important step with various system core equipment, mixed water station should be able to have the ability that the operation of guaranteeing is carried out.This point is by set up the omnibearing video camera of 360 degree at each mixed water station, monitor closely is carried out at the scene, and by the corresponding data compression technique and the communication technology, surveillance map is looked like to transfer on the giant-screen of Centralized Monitoring center video monitoring work station, each heat exchange station is carried out monitoring remote video constantly.Simultaneously for guaranteeing the normal operation of each mixed water station,, each mixed water station unmanned is in full swing at station internal frame set up defences fiery warning system and shower nozzle.
4. secondary pipe network intelligent balance energy-saving monitoring subsystem
The task of this subitem is to be prerequisite with the pipe network system that adopts the intelligent balance control valve, on the basis of the dynamic hydraulic equilibrium of system and system's running resistance automatic optimal, the strategy that adopts the timesharing subregion and produce as required carries out good control to the electrical secondary system operation energy consumption.Every operational factor of secondary pipe network (comprises corresponding each the arm intelligent balance control valve opening of secondary net, upstream pressure, pressure reduction before and after the valve, supply and return water temperature and mean temperature, data on flows and user indoor temperature etc.) remote monitoring, concrete feature according to each user, can adopt based on the radio communication of Zigbee agreement or the mode networking of wire communication (ADSL-VPN or GPRS), communicate by letter with corresponding mixing between the water station, and by mixing the mode of water station with wire communication, monitor data is sent to the computer integrated monitoring center timely and accurately, carries out the record of data, analyze, system's shape body assessment and the work of going up the bit instruction judgement.Secondary net field balancing control system is meant before the secondary pipe network Heavenly Stems and Earthly Branches pipe of correspondence and building and on the arm, adopts the intelligent balance control valve, forms secondary pipe network intelligence distributing system.This system adopts the PLC controller as field controller, controls the flow of each arm institute transmission ﹠ distribution automatically.By the optimizing function of valve self, make whole secondary net system in the assignment of traffic balance, the corresponding resistance minimum of system's operation.The field control balance sysmte serves as to regulate parameter with the aperture of secondary net intelligent balance control valve and the frequency of secondary pressing pump, constitutes control loop for backwater mean temperature (perhaps supply water temperature and return water temperature) and flow for being conditioned parameter with corresponding secondary net.
The major control task of this subsystem is based on dynamic transmission ﹠ distribution balance, feature according to the secondary network users, carry out the formulation of corresponding timesharing area principle, and outside respective chamber/chambers under the temperature conditions, requirement according to period and section, finish the distribution according to need of secondary network users, realize the optimal control of secondary network operation.This subitem is in the design of control strategy, and requiring to design has plurality of optional to select the control model of different controlled variables;
1) be controlled variable with secondary net supply water temperature;
2) be controlled variable with secondary net backwater temperature;
3) be controlled variable with secondary net supply backwater temperature difference;
4) be controlled variable with the secondary net for the pressure of return water difference;
5) the given frequency with frequency converter is a controlled variable;
5 kinds of modes coexist and separate can be switched by field control station terminal operation in computer integrated monitoring Dispatching Control System and the station, select wherein a kind of as current control model, and switching must be undisturbed.Supply backwater pressure reduction by secondary pressing pump VFC secondary net in the running, guarantee that the secondary net reaches corresponding value for the backwater mean temperature, then by the realization of valve automatic optimal process, secondary pressing pump frequency conversion and valve optimizing are complementary the dynamic equilibrium of secondary net.
5. the secondary network users end timesharing subregion and the Energy Saving Strategy of production as required
At first building is classified, is divided into following four classes building:
Basic office building: all have 8 or 9 hours working law (refer to the working time in building, do not comprise user's building of break tour in 24 hours) building, all by the office building processing, this type of timesharing totally is divided into heat supply period and antifreeze period.Heat supply time slot request indoor temperature is not less than 16 degrees centigrade and regulates for benchmark, and should make full use of the thermal inertia of building, and can consider to cause working is that standard begins heat supply with room temperature 18 degree before preceding 1 hour; At 1 hour before leaving offices noon, the frequency reducing operation only need be satisfied antifreeze, begins heat supply when go to work afternoon, and room temperature must remain on 18 degree, and beginning in 1 hour is before leaving offices docked with antifreeze state; For weekend and night then adopting antifreeze strategy operation,, can directly in program, set in view of having the regularity of comparatively fixing rule and the setting of period every day according to the Gregorian calendar weekend.With heat supply directly related Ching Ming Festival of having only New Year's Day, the Spring Festival and some areas in season, the setting of its state should be divided into two kinds of thinkings in legal festivals and holidays, for having upper control system, directly sends instruction from upper, sets corresponding state; And for the system that only has local control, slave computer should be reserved the interface of manual adjustment, and is annual in the heating system turn(a)round, according to then calendar and arrange disposable setting festivals or holidays.
The user of types of schools: it is stronger that the type user's live and work zone clearly reaches corresponding period regularity, utilize the regulation and control of room temperature that the student is concentrated on classroom or library in the corresponding period, guarantee that the respective regions temperature is not less than 18 degree, period is set at 7:00-11:30,13:30-16:30 and 18:30-21:00, centre portion reaches down before the class, the thermal inertia that makes full use of building is come holding temperature, except the arm of the above exterior wall in two sides (with due regard to stopping getting up early evening); Other period then removes and reserves indivedual heating areas, then is set at antifreeze running status; For the school with dormitory type, the living area heat supply period can be decided to be 21:00-24:00 and 5:30-8:30 next day heat supply at this moment district temperature should not be lower than 18 degree; The antifreeze state operation of all the other periods; During winter vacation, the demand of the centralized management of consideration, except that indivedual buildings, all the other are antifreeze running status entirely; This type user should not comprise the kindergarten.
The dwelling house class: consider resident's demand (comprising old man, pregnant woman and baby), time-sharing heating should make full use of the thermal inertia in room, and room temperature is carried out suitable control, and on the whole, the inpatient department of hospital should belong to this type under specific temperature conditions; The kindergarten is also type consideration like this in the heating time scope, and other periods can be made as antifreeze running status.Basic ideas are that whole day is divided into four periods, the antifreeze section of a.: time set is 24:00-4:00, and this moment, room temperature was to be not less than 15 degree; B. heat supply I period: be set at 4:00-9:00, this period heat supply room temperature should not be lower than 18 degree; C. heat supply II period: be set at 9:00-16:00, this period heat supply room temperature should not be lower than 15 degree; 4) the heat supply III period: be set at 16:00-24:00, heat supply this moment room temperature should not be lower than 18 degrees centigrade.For this type user, can suitably improve the temperature of setting in practice according to the whole user demand, to embody the hommization of heat supply.
Industry manufacturer class: the thermostatic control in 24 hours of common industrial manufacturer, temperature are controlled at 8 degree; For the real needs of the manufacturer that specific demand is arranged, can adopt the concrete regularly section of the similar mode of the same 3 classes to supply water according to the user.
That heating time selection at interval should be considered again is energy-conservation, carry out on the basis of comfort level and suitable three factors of startup frequency, should set corresponding return water temperature adjustment curve for dissimilar buildings, this and one be complementary for temperature, it is further energy-conservation and satisfy user's comfort level requirement that the simultaneity factor time-division operation need make full use of the thermal inertia of building itself.When switch in the different temperatures interval, also to consider the problem of switching time and pre-workload.For control, the variation of thinking mainly is the indoor temperature that sets for day part, under the prerequisite of considering the outdoor temperature compensation, and the corresponding water temperature of setting secondary water-supply and secondary backwater, thus further realize the energy-conservation of system.For indoor temperature 18 degree,, just control water temperature, thereby realize initiatively energy-conservation from the demand source in other words according to dissimilar users at the room temperature that sets and with reference to corresponding outer temperature with the compensation principle that outdoor temperature is complementary.
Guaranteeing that room temperature under constant prerequisite of corresponding period of institute, can correspondence set up secondary water-supply and secondary backwater and the pairing empirical equation of outdoor temperature, as making:
The secondary backwater also can adopt the formula of same form to analyze, and in the formula: a, b, c are the related parameter that has of pipe network their location meteorology, and this formula is the computational methods of secondary water-supply temperature given value.Corresponding every coefficient, according to the determined continuous outdoor temperature of the meteorological data of locality, and the value of the secondary water-supply temperature of calculating, return by linear least square, because of the difference of each factor, the inevitable difference to some extent in various places.The determined variation that can follow the tracks of outdoor temperature of formula thus, the influence that terminal use's indoor temperature is not changed realizes stable heating.
Of the present invention energy-conservation be with the heat demand of fully being close to the users, and by the just room temperature upper limit at mutatis mutandis family of upper setting, at utmost guarantee user's heat demand in its restrictive condition system, guarantee that simultaneously systemic circulation energy consumption and operating mode are complementary, and be unlikely to occur the situation of the little temperature difference of big flow, make the operation of secondary net be in optimum state.
Description of drawings
Fig. 1 mixes water station intelligent balance Monitor And Control Subsystem schematic diagram
Fig. 2 is an intelligent temperature control dynamic balance valve scheme of installation
Number in the figure is: 1 intelligent regulating valve; 2 flowmeters; 3 filters; 4 Pressure gauges; 5 secondary pressing pumps; 6 hot users; 7 supply water temperature sensors; 8 return water temperature sensors; 9 non-return valves; 10 hand-operated valves; 11 radiators; 12 dynamic balance valves; 13 by-passing valves.
The specific embodiment
Below by embodiment, in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail:
Embodiment 1:
At first, determine corresponding secondary supply and return water temperature (secondary is for the backwater mean temperature) by outdoor temperature sensor, and according to user's section of living in and the type of period, determine corresponding indoor temperature, area and unit are thermic load coefficient with correspondence, calculate the thermic load of corresponding each arm of secondary net fast, under given secondary pipe network condition, select suitable pipeline specific frictional resistance, determine the circular flow of the required correspondence of arm, determine the global cycle flow of secondary pipe network after gathering, guarantee that fundamentally the operation of secondary net itself is under the prerequisite of the flow that has a narrow range of temperature greatly.Through the mixed water of optimizing than under the condition, according to the operation control model (given secondary net supply water temperature or given secondary net supply backwater mean temperature etc.) that the secondary net adopted, determine the once flow of net, corresponding once net supply water temperature is that the outdoor temperature compensation policy that adopts according to thermal source is determined, it once is foundation, set suitable redundant coefficient,, guarantee the whole state that is in optimization of system's operation for the running of a thermal source and a circulating pump provides the foundation of producing as required.Under a circulating pump frequency of each compensation value condition and correspondence, adopt definite value control before the downstream pressure that once supplies water and the primary water valve.Under the temperature Compensation Strategy of correspondence, corresponding secondary pressing pump guarantees corresponding secondary net supply head, to satisfy user's heat demand.In the running, mix the variation of water regulating valve aperture, guarantee that the mean value that mixes back secondary water-supply temperature or secondary return water temperature reaches the control target by intelligence.Simultaneously, by to each once supplies the record of backwater intelligent regulating valve valve position in the running, the waterpower state of respectively standing on this basis ordering is as the unified direct foundation of regulating of net once.In other words, under the big principle of the flow upper limit, carry out whole machine balancing adjusting orderly, thereby guarantee once the efficient stable operation of net under various operating modes from the least favorable station to the initial station.
Next is behind the hydraulic characteristic of determining once the corresponding operating mode of net and secondary net, in the continually varying process, realizes once the dynamic hydraulic equilibrium of net and secondary net.For single operating mode, by feedback with calculate that can to determine corresponding once be the secondary feature, but in change procedure, realize that once the intelligent balance of net and secondary net is extremely important.Intelligent balance control valve of the present invention is to realize dynamic hydraulic equilibrium of pipe network and the minimized hardware foundation of transmission ﹠ distribution resistance.When the situation of thermic load increase appears in user for a certain reason, a water supply valve aperture is promoted, the assurance of thermal source is provided for the adjusting of secondary net.But the principle of unlatching is to adopt the method for opening stage by stage to carry out.From the change trend and the value of secondary return water temperature, and, judge the degree that user's request changes according to the hysteresis characteristic of area of heat-supply service correspondence and the value of typical user (more unfavorable user) indoor temperature.Appropriateness increases an output, and the mixed water yield can not change earlier, under the situation of flow and temperature dual lifting, according to secondary return water temperature value and corresponding variation tendency, judges next step action once more like this.Certainly, according to the demand that matter is regulated, the secondary backwater water yield also can appropriateness be turned down, and it is more obvious which kind of mode effect this need compare.The enforcement of this point can be divided into two and go on foot the method for walking, the first step is electrical secondary system to be adopted the matter control method of constant current amount, when improving an output, mix the corresponding secondary circling water flow rate of regulating of water valve by intelligence, control the variation of return water temperature, target is to realize that typical user's indoor temperature reaches the span of setting.Then on its basis, launch the analysis of different quality regulative mode influence simultaneously, and the change records that the different adjustment mode is produced is with in can management database, as the basis that control is from now on optimized, final purpose is the operational energy efficiency automatic optimal.The intelligent balance valve of will giving full play in service is in pressure reduction and flow measurement function, in detail under metering Different Strategies and continuous each working condition of operation, mix water ratio, secondary net hot water flow, the relation between the corresponding pressure reduction, and the mode by telecommunication, be sent in the upper database of remote control center correspondence, optimize the data basis of algorithm as study.Simultaneously in running, various strategies are when guaranteeing corresponding operating mode secondary net constant pressure, once for pressure drop that backwater valve consumed and net flow once, as the basis of system's operation energy consumption optimization.For the thermally equilibrated realization of secondary net itself, then be by the intelligent balance valve being mounted to arm before the building, by the feature of valve self optimizing, be implemented in the dynamic equilibrium under the corresponding hydraulics.Certainly mixing water station is to move under the coupling that once reaches the secondary net, but for the system behind the secondary pressing pump, the dynamic realization of its balance, basic process with once net hydraulically balanced realization and there is no essential difference.
The intelligent temperature control dynamic balance valve is installed on the water return pipeline in each building, and the supply and return water temperature sensor is installed at a respective nodes place in the building, and the intelligent temperature control dynamic balance valve itself has the sensor of measuring pressure and temperature before and after the valve, as shown in Figure 2.
The intelligent temperature control dynamic balance valve is a kind of SMART FLUID control valve of brand new ideas, it have traditional mechanical type dynamic balance valve incomparable advantage, can be according to the variation and the heat supply space design temperature of temperature, by online detection to supply water temperature and return water temperature, intelligently carry out the control of valve opening, thereby realize rational heat flow control and hydraulic equilibrium this unit heating space.
About mixing the realization of water, then be under the control model of correspondence, regulate constant pressure before downstream pressure and the primary water intelligent balance control valve as the control intelligent balance that once supplies water, once net and the decoupling zero of secondary net, and provide enough pressure reduction for the realization that mixes water, realize the control strategy of secondary net by mixing water, so whole system is formed the closed intelligent energy-saving control loop, realize energy saving in running on the whole.
In the running, secondary pressing pump need be according to user's landform, the position in the pipe network of living in, the feature of secondary network users, the arrangement and the method for operation all need be made suitable adjustment, both guaranteed secondary net waterpower stable circulation (pressure reduction, flow), should be again that primary water pressure is unlikely to too high, also should guarantee to mix the smooth realization of water simultaneously.
The data that each subsystem is monitored and gathered in system's running, by host computer interface, computer integrated monitoring center, write down, form and analysis, these data and whole loop control system are complementary, as running Optimization with the foundation that can manage.
Claims (8)
1. an intelligent power saving mixes the water heat supply method, comprises mixing water station intelligent balance Monitor And Control Subsystem, computer integrated monitoring center, video monitoring subsystem and secondary net intelligent balance energy-saving monitoring subsystem;
Mix water station intelligent balance Monitor And Control Subsystem: once supply water and the primary water pipeline on the intelligent balance control valve that is provided with, the intelligent balance control valve has sensor and actuator, intelligent balance regulating valve flow and pressure reduction carry out on-line monitoring to flowing through, control by the intelligent balance control valve, make each branch road flow transmission ﹠ distribution balance in the system, and simultaneously under the given prerequisite of thermal source circulating pump frequency, by the adjusting of intelligent balance control valve opening self, the system's resistance of transmission ﹠ distribution consumption on valve reduced;
Computer integrated monitoring center: receive all technological parameters that each field control station transmits, control parameter and with its centralized displaying, record and warning in the various figures, chart, curve and the tables of data that form; To control desired value or the desired value curve of respectively controlling subitem in the field control station, carry out long-range given and modification; Automatically report to the police to getting over the line parameter; Can store the historical data more than 200 days; Can generate various printing reports and operational factor curve map with needs on request; Can realize each step historical operation is write down automatically and inquires about; Thermal source is carried out metering separate, can store thermal source more than 200 days: supply the backwater water yield, supply and return water temperature, supply pressure of return water, thermal source circulating pump frequency and parameters such as power consumption, thermal source coal consumption and outdoor temperature, use the foundation that to manage and to regulate and control as thermal source;
The video monitoring subsystem: by data compression with communicate by letter, surveillance map is looked like to transfer on the giant-screen of Centralized Monitoring center video monitoring work station, each heat exchange station is carried out monitoring remote video constantly; Simultaneously for guaranteeing the normal operation of each mixed water station, at station internal frame set up defences fiery warning system and shower nozzle;
Secondary net intelligent balance energy-saving monitoring subsystem: the pipe network system with employing intelligent balance control valve is a prerequisite, on the basis of the dynamic hydraulic equilibrium of system and system's running resistance automatic optimal, the strategy that adopts the timesharing subregion and produce as required carries out good control to the electrical secondary system operation energy consumption; The remote monitoring of pressure reduction, supply and return water temperature and every operational factors such as mean temperature, data on flows and user indoor temperature before and after corresponding each the arm intelligent balance control valve opening of secondary net, upstream pressure, the valve, employing is based on the radio communication of Zigbee agreement or the mode networking of wire communication, communicate by letter with corresponding mixing between the water station, and by mixing the mode of water station with wire communication, monitor data is sent to the computer integrated monitoring center timely and accurately, carries out record, analysis, system's shape body assessment of data and go up the work that bit instruction is judged.
2. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, the main adjusting parameter of described mixed water station intelligent balance Monitor And Control Subsystem field control comprises: 1) corresponding once the supply water aperture of intelligent balance control valve of water station of mixing; 2) corresponding aperture of mixing water station primary water intelligent balance control valve; 3) operating frequency of secondary pressing pump; 4) intelligence is mixed the aperture of water regulating valve.
3. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, four controlling units of described mixed water station intelligent balance Monitor And Control Subsystem form the control loop of sealing, and the parameter that is conditioned of this subitem correspondence mainly contains: the downstream pressure of the intelligent balance control valve that 1) once supplies water; 2) downstream pressure of primary water intelligent balance control valve; 3) secondary net supply head; 4) mix back secondary net supply water temperature.
4. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, the control mode of described mixed water station intelligent balance Monitor And Control Subsystem is: the pressure behind its valve is controlled in the variation of the intelligent regulating valve aperture that once supplies water; The pressure before its valve is controlled in the variation of primary water intelligent regulating valve aperture; The variation control secondary user of secondary pressing pump frequency is for backwater pressure reduction; Mix the aperture control secondary water-supply temperature of water valve; Keep the flowmeter on the primary water pipeline, cooperate with the flow of the intelligent balance control valve record that once supplies water, metering once supplies circling water flow rate poor; A water supply flow is set the transmission ﹠ distribution upper limit, simultaneously poor according to secondary pressure of return water and a water supply flow, the warning function of setting dehydration.
5. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, under the control model of described mixed water station intelligent balance Monitor And Control Subsystem, supply water temperature and flow need be made corresponding outdoor temperature compensation at changes of seasons; Under a circulating pump frequency of each compensation value condition and correspondence, adopt definite value control before the downstream pressure that once supplies water and the primary water valve; Under the temperature Compensation Strategy of correspondence, corresponding secondary pressing pump is used to guarantee corresponding secondary net supply head; Mix the variation of water regulating valve aperture by intelligence, guarantee that the mean value that mixes back secondary water-supply temperature or secondary return water temperature reaches the control target; By to each once supplies the record of backwater intelligent regulating valve valve position in the running, the waterpower state of respectively standing on this basis ordering is as the unified direct foundation of regulating of net once.
6. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, the upper control in described computer integrated monitoring center mainly comprises: 1) under the prerequisite of dynamic equilibrium transmission ﹠ distribution, to respectively account for and carry out comprehensive differential analysis mechanisms, whole system be carried out unified waterpower adjustment from upper; Aggregate demand does not exceed the upper limit, then reports to the police upper, and with the realization of promotion thermal source raising frequency, and according to rank adjustment successively from high to low, ratio is regulated in running; If exceed outside the heat supply limit of power, then press user characteristics, each station is allowed the secondary water-supply temperature or unifies decline adjustment mechanism for the backwater mean temperature; 2) because the outdoor temperature burst causes the problem of heat source insufficiency; Unify decline adjustment mechanism with each station secondary water-supply temperature or for the backwater mean temperature, realize according to a certain percentage; 3) system's operation mixes water than optimizing; By in mixed water lines, intelligence is installed mixes water regulating valve, but utilize the feature of its flow, pressure reduction remote monitoring, adjust by the mixed water ratio in the heat supply phase; Determine when mixed water ratio, need cooperatively interact with timesharing subregion of being realized at the secondary user side and the operation strategy of producing as required; 4) the unified of intelligent secondary pipe network regulated; From the computer integrated monitoring center, according to the long-time running monitoring result of each arm waterpower state of secondary pipe network,, carry out the same allotment of valve opening according to corresponding hydraulic characteristic, under the major premise of whole machine balancing, there is emphasis ground to ensure special user's individual sexual demand.
7. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, described secondary net intelligent balance energy-saving monitoring subsystem comprises secondary net field balancing control system, secondary net field balancing control system is meant before the secondary pipe network Heavenly Stems and Earthly Branches pipe of correspondence and building on the arm, adopt the intelligent balance control valve, form secondary pipe network intelligence distributing system; Secondary net field balancing control system adopts the PLC controller as field controller, controls the flow of each arm institute transmission ﹠ distribution automatically; By the optimizing function of valve self, make whole secondary net system in the assignment of traffic balance, the corresponding resistance minimum of system's operation; The field control balance sysmte serves as to regulate parameter with the frequency of the aperture of secondary net intelligent balance control valve and secondary pressing pump, with corresponding secondary net supply water and/or backwater mean temperature and flow for being conditioned parameter formation control loop.
8. intelligent power saving according to claim 1 mixes the water heating system, it is characterized in that, described secondary pipe network intelligent balance energy-saving monitoring subsystem is based on dynamic transmission ﹠ distribution balance, feature according to the secondary network users, carry out the formulation of corresponding timesharing area principle, and outside respective chamber/chambers under the temperature conditions, according to the requirement of period and section, finish the distribution according to need of secondary network users, realize the optimal control of secondary network operation; Can select the control model of different controlled variables below adopting: be controlled variable 1) with secondary net supply water temperature; 2) be controlled variable with secondary net backwater temperature; 3) be controlled variable with secondary net supply backwater temperature difference; 4) be controlled variable with the secondary net for the pressure of return water difference; 5) the given frequency with frequency converter is a controlled variable; Five kinds of modes coexist and separate can be switched by field control station terminal operation in computer integrated monitoring Dispatching Control System and the station, select wherein a kind of as current control model, and switching must be undisturbed; Supply backwater pressure reduction by secondary pressing pump VFC secondary net in the running, guarantee that the secondary net reaches corresponding value for the backwater mean temperature, then by the realization of valve automatic optimal process, secondary pressing pump frequency conversion and valve optimizing are complementary the dynamic equilibrium of secondary net.
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| CN109724136A (en) * | 2019-02-27 | 2019-05-07 | 北京中科方盛能源科技有限公司 | The cold and hot dedicated being balanced at different levels device of supply |
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| CN114704874A (en) * | 2022-03-25 | 2022-07-05 | 内蒙古思铂睿特节能科技有限公司 | Accurate control method for heating parameters of heating station based on flexible heating system |
| CN114704874B (en) * | 2022-03-25 | 2023-12-19 | 内蒙古思铂睿特节能科技有限公司 | Precise control method for heating parameters of heating power station based on flexible heating system |
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Application publication date: 20110119 |