CN104949569A - Efficient energy-saving intelligent control system of heat exchanger unit - Google Patents
Efficient energy-saving intelligent control system of heat exchanger unit Download PDFInfo
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Abstract
The invention provides an efficient energy-saving intelligent control system of a heat exchanger unit. Outdoor temperature, temperature and pressure of a primary network water supply pipe and a primary network water return pipe, temperature and pressure of a secondary network water supply pipe and a secondary network water return pipe and other variables are fed back to the control system, and the control system intelligently controls the opening degree of an electric control valve on the primary network water supply pipe, operation frequency of secondary network circulation pumps and starting and stopping of water supplementing pumps according to comparison between existing variables and original system set parameters. The functions of a frequency converter is brought into play to the maximum degree, intelligent control of the system is really achieved, and the system intelligently judges the real needs of heat utilization units, makes corresponding responses and controls the states and rotating speeds of the circulation pumps; manual intervening is avoided, and accurate digitalized control is achieved; in addition, the control system can be widely applied to the fields of a region heat supplying/refrigerating system, a living hot water system, waste heat recovery, production technology cooling systems and others.
Description
Technical field
The invention belongs to field of intelligent control technology, particularly relate to the energy-efficient intelligent control system of a kind of heat-exchange unit.
Background technology
Existing heat-exchange system includes general heat-exchange unit and control system, as shown in Figure 1, wherein, heat-exchange unit comprises secondary net return pipe 1, secondary net feed pipe 2, secondary network return pipe 3, secondary network feed pipe 4, heat exchanger 5, circulating pump 6, water pipe 7 and small pump 8; Hot water, secondary network return pipe 3 that one secondary net feed pipe 2 carries heating plant heating carry cold water respectively to heat exchanger 5, and carry out heat exchange in heat exchanger 5 after, the cooled cold water of one secondary net feed pipe 2 returns heating plant by secondary net return pipe 1 circular flow, secondary network feed pipe 4 by secondary network return pipe 3 heating after delivery to user; Circulating pump 6 is located on secondary network return pipe 3, for providing power to the water circulation of secondary network feed pipe 4, secondary network return pipe 3; In the secondary network pipeline that water in filling pipe 7 tunnel is added into secondary network return pipe 3 by small pump 8, secondary network feed pipe 5 is formed; In addition, above-mentioned control system comprises electric control valve D, outdoor temperature sensor TW, temperature switch board 9, circulating pump frequency conversion tank 10, temperature transmitter T, pressure transmitter P, small pump frequency conversion tank 11; Wherein, electric control valve is located on a secondary net feed pipe, and electric control valve is connected with temperature switch board signal; Outdoor temperature sensor is connected with temperature switch board signal, for responding to the environment temperature around heat-exchange unit; Temperature transmitter is located on secondary network feed pipe, two pressure transmitters are located on secondary network feed pipe, secondary network return pipe respectively, and temperature transmitter is connected with temperature switch board signal, two pressure transmitters are connected with small pump frequency conversion tank, circulating pump frequency conversion tank signal respectively; Small pump frequency conversion tank is connected with small pump signal, and circulating pump is connected with circulating pump signal.
In this heat-exchange system, control system only carries out simple extensive style control for partial parameters, substantially be control the output quantity of primary fluid by electric control valve thus realize the metastable supply and return water temperature of secondary network, the control of secondary network circulating pump adopts simple pressure parameter to control substantially, artificial setting fixed frequency is run simultaneously, in this legacy system, frequency converter in fact only serves the function of a reduced-voltage starting, does not play the function of frequency converter timing to greatest extent.The interlock of a secondary network can not be realized, heat transfer effect and economical operation two indices can not be taken into account simultaneously.
Summary of the invention
The object of the present invention is to provide the energy-efficient intelligent control system of a kind of heat-exchange unit, be intended to solve present extensive style control model, to save energy consumption to greatest extent, the situation of realizations heat unit and the doulbe-sides' victory of confession heat unit under the prerequisite meeting heat demand.
The present invention is achieved in that a kind of heat-exchange unit intelligent control system, and described heat-exchange unit comprises a secondary net return pipe, a secondary net feed pipe, secondary network return pipe, secondary network feed pipe, heat exchanger and circulating pump; Hot water, secondary network return pipe that a described secondary net feed pipe carries heating plant heating carry cold water respectively to heat exchanger, and carry out heat exchange in heat exchanger after, the cooled cold water of a described secondary net feed pipe returns heating plant by a secondary net return pipe circular flow, described secondary network feed pipe by secondary network return pipe heating after delivery to user; Described circulating pump is located on secondary network return pipe, for providing power to the water circulation of secondary network feed pipe, secondary network return pipe;
Described control system comprises electric control valve, the first pressure and temp transmitter, the second pressure and temp transmitter, outdoor temperature sensor and intelligent control unit; Described electric control valve is located on a secondary net feed pipe, and described first pressure and temp transmitter, the second pressure and temp transmitter are located on a secondary net feed pipe, a secondary net return pipe respectively; Described outdoor temperature sensor is arranged on the outdoor closed on described heat-exchange unit; Described electric control valve, the first pressure and temp transmitter, the second pressure and temp transmitter, outdoor temperature sensor are connected with intelligent control unit signal respectively; Wherein,
Described first pressure and temp transmitter, for monitoring water temperature in a secondary net feed pipe, hydraulic pressure send signal to intelligent control unit in real time;
Described second pressure and temp transmitter, for monitoring water temperature in a secondary net return pipe, hydraulic pressure send signal to intelligent control unit in real time;
Described intelligent control unit, carries out temperature-compensating for the experience adjustment curve changed by outdoor temperature and set, and by controlling to adjust the aperture of described electric control valve, controls the flow of a secondary net feed pipe hot water.
Preferably, described control system also comprises the 3rd pressure and temp transmitter, the 4th pressure and temp transmitter and circulating pump control device; Described 3rd pressure and temp transmitter, the 4th pressure and temp transmitter are located on secondary network return pipe, secondary network feed pipe respectively, and described 3rd pressure and temp transmitter, the 4th pressure and temp transmitter are connected with intelligent control unit signal respectively, described circulating pump control device is connected with circulating pump, intelligent control unit signal respectively; Wherein,
Described intelligent control unit, the pressure and temperature data also for collecting according to the 3rd pressure and temp transmitter, the 4th pressure and temp transmitter, the experience adjustment curve in conjunction with setting goes out the actual heating load demand of heat user;
Described circulating pump control device, the actual heating load demand for calculating according to described intelligent control unit regulates the rotating speed of circulating pump, controls the water circulation pressure between secondary network return pipe and secondary network feed pipe and flow.
Preferably, heat-exchange unit also comprises water pipe and small pump; The water side of described water pipe is connected on secondary network feed pipe, and described small pump is located on water pipe;
Described control system also comprises water-replenishing control device; Described water-replenishing control device is connected with described intelligent control unit signal respectively; Wherein,
Whether described intelligent control unit, also for receiving the pressure of return water feedback signal of the 3rd pressure and temp transmitter, and reach desired value according to described signal to pressure of return water in secondary network return pipe and judge;
Described water-replenishing control device, for controlling the switch of small pump, rotating speed according to the judged result of described intelligent control unit.
Preferably, the foundation of described experience adjustment curve is specially: set up the corresponding relation between outdoor temperature and secondary network supply water temperature according to heat supply experience, draws the experience adjustment curve obtaining outdoor temperature and secondary network supply water temperature according to this corresponding relation.
The present invention overcomes the deficiencies in the prior art, there is provided a kind of heat-exchange unit energy-efficient intelligent control system, characteristic according to heating system writes control program, pass through outdoor temperature, the temperature of one secondary net feed pipe and a secondary net return pipe and pressure, the variable feedbacks such as the temperature of secondary network feed pipe and secondary network return pipe and pressure are to control system, control system is compared according to existing variable and original system set-up parameters and is carried out the aperture that intelligentized control method is arranged on the electric control valve on a secondary net feed pipe, the running frequency of secondary network circulating pump and the start and stop of small pump.
In the present invention, the valve opening of the electric control valve that Intelligent adjustment one secondary net feed pipe is arranged is carried out by the temperature of outdoor temperature and secondary network feed pipe, heat exchange station output is controlled with this, reach the thermic load total amount automatically controlling a secondary net, realize the distribution according to need of an output between each heat exchange station.Meanwhile feed back to according to the temperature sensor that the feed pipe of secondary network and the return pipe of secondary network are arranged and pressure transmitter the running frequency that the temperature of control system and pressure signal carry out Based Intelligent Control circulating pump, final realization, while meeting user's heat demand, saves power consumption to greatest extent.At running because the evaporating, emitting, dripping or leaking of liquid or gas of whole heat supply pipeline and the maintenance of pipe network, the pressure drop of return pipe and feed pipe can be caused, heat demand can not be met, the pressure signal of control system is fed back to by the pressure transmitter be arranged on return pipe, control system can detect that pressure changes automatically, control the automatic start-stop of small pump with this, the energy-saving safe realizing whole system runs.
Compared to the shortcoming and defect of prior art, the beneficial effect acquired by the present invention is:
(1) the present invention changes existing control system extensive style, the control situation of unification, achieve the interlock of first and second net, and the interlock between heating system and terminal heat user and outdoor environment, simultaneously played the function of frequency converter to greatest extent, allow system real achieve intelligentized control method, carried out the true needs of intelligent decision heat unit by system, make corresponding response, the state of controlled circulation pump and rotating speed simultaneously.
(2) present invention achieves the interlock for heat unit and heat unit, the i.e. heating heat demand of satisfied heat unit, also save the cost for heat unit simultaneously, for the non-thermal electromagnetic coproduction heat supply of the present overwhelming majority, because be not heat supply in 24 hours, so the operation of heat-exchange system neither 24 hours, to go the start and stop of control system like this according to the ruuning situation of boiler with regard to needing special messenger, and manipulation most of time artificial like this can cause partial heat energy and electric loss of energy, the party of the morning that circulating pump starts or stopping increases the loss of heat-exchange system electric energy, the loss that can increase again boiler room electric energy and heat energy morning of the evening that circulating pump starts or stopping.And native system will have control module to carry out intelligent decision thus selection circulating pump starting state and holding state, people will not again be needed to intervene for going.Reach accurate Digital Control.
(3) the present invention can be applied to district heating/refrigeration system, hot water supply system, waste heat recovery, the numerous areas such as production technology cooling system widely.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing heat-exchange system;
Fig. 2 is the structural representation of heat-exchange system of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 2, wherein, Fig. 2 is the structural representation of heat-exchange system of the present invention.
A kind of heat-exchange unit intelligent control system, described heat-exchange unit comprises secondary net return pipe 1, secondary net feed pipe 2, secondary network return pipe 3, secondary network feed pipe 4, heat exchanger 5 and circulating pump 6; Hot water, secondary network return pipe 3 that a described secondary net feed pipe 2 carries heating plant heating carry cold water respectively to heat exchanger 5, and carry out heat exchange in heat exchanger 5 after, the cooled cold water of a described secondary net feed pipe 2 returns heating plant by secondary net return pipe 1 circular flow, described secondary network feed pipe 4 by secondary network return pipe 3 heating after delivery to user; Described circulating pump 6 is located on secondary network return pipe 3, for providing power to the water circulation of secondary network feed pipe 4, secondary network return pipe 3;
Described control system comprises electric control valve D, the first pressure and temp transmitter PT1, the second pressure and temp transmitter PT2, outdoor temperature sensor TW and intelligent control unit (this control unit is intelligent chip, and name of product is heat exchange station intelligent controller) 12; Described electric control valve D is located on a secondary net feed pipe 2, and described first pressure and temp transmitter PT1, the second pressure and temp transmitter PT2 are located on secondary net feed pipe 2, secondary net return pipe 1 respectively; Described outdoor temperature sensor TW is arranged on the outdoor closed on described heat-exchange unit; Described electric control valve D, the first pressure and temp transmitter PT1, the second pressure and temp transmitter PT2, outdoor temperature sensor TW are connected with intelligent control unit 12 signal respectively; Wherein,
Described first pressure and temp transmitter PT1, for monitoring water temperature in a secondary net feed pipe 2, hydraulic pressure send signal to intelligent control unit 12 in real time;
Described second pressure and temp transmitter PT2, for monitoring water temperature in a secondary net return pipe 1, hydraulic pressure send signal to intelligent control unit 12 in real time;
Described intelligent control unit 12, carries out temperature-compensating for the experience adjustment curve changed by outdoor temperature and set, and by controlling to adjust the aperture of described electric control valve D, controls the flow of secondary net feed pipe 2 hot water.
In embodiments of the present invention, the control in heat-exchange system pipe network loop (secondary net return pipe 1, secondary net feed pipe 2), the mainly control of thermic load, the experience adjustment curve being changed by outdoor temperature and set, carry out temperature-compensating, by controlling to adjust the aperture of the electric control valve of primary circuit, controlling the flow of a heat exchange station pipe network hot water, thus realizing the control of heating demand total amount.The foundation of experience adjustment curve is specially: set up the corresponding relation between outdoor temperature and secondary network supply water temperature according to heat supply experience, draws the experience adjustment curve obtaining outdoor temperature and secondary network supply water temperature according to this corresponding relation.When outdoor temperature height, then the secondary water-supply temperature needed can reduce automatically, otherwise secondary water-supply temperature can raise automatically, compensating outdoor temperature, reaching the object automatically regulating secondary network supply water temperature by regulating, thus the final rotating speed automatically regulating circulating pump.Reach the object of saving energy consumption.
The innovation of this control system is mainly reflected in has brought this variable of outdoor temperature into, achieves the intelligent selection running frequency of circulating pump 6, plus-minus pump and start and stop simultaneously, to reach under the prerequisite ensureing heat demand, realizes energy-conservation to greatest extent.Control system originally does not bring this variable of outdoor temperature into, certainly will need the artificial valve opening regulating a secondary net feed pipe according to outdoor temperature situation, simultaneously the artificial running frequency regulating circulating pump 6.And this control system rule of thumb curve outdoor temperature is mated with supply water temperature, carry out intelligent coupling feed pipe supply water temperature by control system according to outdoor temperature, automatically regulate according to the supply water temperature of feed pipe the electric control valve D that a network pipeline is arranged simultaneously.
Control system originally can be artificial fixed frequency set to frequency converter run, controlled circulation pump 6 is carried out with the pressure of supply water signal of simple secondary water-supply pipe, and the way adopted is that setting system normally runs the operation that the force value do not reached carrys out controlled circulation pump 6, do not play the effect of frequency converter at all.And secondary network feed pipe 4 temperature that native system adopts, the temperature of pressure and secondary network return pipe 3, pressure signal, and secondary net feed pipe 2 temperature, pressure, one secondary net return pipe 1 temperature, pressure signal carrys out the running frequency of coordinated signals circulating pump 6, concrete control mode is, when the temperature of a secondary net feed pipe 2, after pressure reaches control system setting value, circulating pump 6 starts to start and low frequency is run, at this moment again according to secondary network return pipe 3 temperature, pressure and secondary network feed pipe 4 temperature, difference between pressure regulates the running frequency of circulating pump 6, after difference compares with setting value, difference greatly then increases running frequency, when difference is little, start to reduce running frequency, secondary network return pipe 3 temperature and secondary network feed pipe 4 temperature reach setting value and can keep stable within the time of setting simultaneously, then circulating pump 6 starts standby, and (such as 30 minutes) circulating pump 6 can start again automatically after setting-up time after standby.After secondary net feed pipe 2 temperature, pressure are lower than setting value, illustrate that heating plant stops heat supply, then circulating pump 6 is automatically out of service, treats secondary net feed pipe 2 temperature, after pressure reaches setting value again, circulating pump 6 starts again automatically by default work pattern.
Concrete case in community, Tianshui: because be municipal heat supply and do not have calorimeter in original system, so the situation of heat energy does not have concrete numerical value, we only acquire power consumption numerical value.With this, energy saving of the present invention is described.With under energy weather condition, before not carrying out reducing energy consumption, the odd-numbered day power consumption of this system is 225KWH, and after having carried out the system reform, odd-numbered day power consumption is 73KWH, well meets the heat demand of user simultaneously.
In further implementation process, for realizing the Based Intelligent Control of heat exchanging secondary system pipe network, in embodiments of the present invention, described control system also comprises the 3rd pressure and temp transmitter PT3, the 4th pressure and temp transmitter PT4 and circulating pump control device (Full-automatic circulation pump intelligent controller) 13; Described 3rd pressure and temp transmitter PT3, the 4th pressure and temp transmitter PT4 are located on secondary network return pipe 3, secondary network feed pipe 4 respectively, and described 3rd pressure and temp transmitter PT3, the 4th pressure and temp transmitter PT4 are connected with intelligent control unit signal 12 respectively, described circulating pump control device 13 is connected with circulating pump 6, intelligent control unit signal 12 respectively; Wherein,
Described intelligent control unit 12, the pressure and temperature data also for collecting according to the 3rd pressure and temp transmitter PT3, the 4th pressure and temp transmitter PT4, the experience adjustment curve in conjunction with setting goes out the actual heating load demand of heat user;
Described circulating pump control device 13, the actual heating load demand for calculating according to described intelligent control unit 12 regulates the rotating speed of circulating pump, controls the water circulation pressure between secondary network return pipe 3 and secondary network feed pipe 4 and flow.
In the control of heat-exchange system secondary pipe network loop of the present invention (secondary network return pipe 3 and secondary network feed pipe 4), realize mainly through Frequency Converter Control circulating pump 6, system is by being arranged on pressure, temperature sensor the measuring for pressure of return water, supply and return water temperature secondary pipe network loop of secondary pipe network, and calculate the actual heating load demand of heat user according to the experience adjustment curve of outdoor temperature change and setting, the rotating speed of circulating pump 6 is regulated by frequency converter, control secondary heat exchange station secondary pipe network pressure of supply water and flow, meet the heat demand of user.When heating demand does not reach actual demand, improve circulating pump 6 rotating speed, strengthen pressure and the flow of secondary pipe network, improve the heating load of secondary pipe network, improve heating effect, meet heat demand.When heating demand exceedes actual demand, reduce the rotating speed of circulating pump 6, reduce pressure and the flow of secondary pipe network, reduce the heating load of secondary pipe network, reach most economical operational mode.Electric energy and heat energy is saved under the prerequisite meeting heat demand.Realize heat supply and the safety and economic operation by heat.
In further implementation process, for realizing intelligent moisturizing, in embodiments of the present invention, described heat-exchange unit also comprises water pipe 7 and small pump 8; The water side of described water pipe is connected on secondary network feed pipe 4, and described small pump 8 is located on water pipe 7;
Described control system also comprises water-replenishing control device (full-automatic water-supplying pump intelligent controller) 14; Described water-replenishing control device 14 is connected with described intelligent control unit 12 signal respectively; Wherein,
Whether described intelligent control unit 12, also for receiving the pressure of return water feedback signal of the 4th pressure and temp transmitter PT4, and reach desired value according to described signal to pressure of return water in secondary network return pipe 3 and judge;
Described water-replenishing control device 14, for controlling the switch of small pump 8, rotating speed according to the judged result of described intelligent control unit 12.
In secondary network constant pressure supply water control procedure of the present invention; when system dehydration; secondary pipe network pressure drop; intelligent control unit 12 is according to secondary network pressure of return water feedback signal; carry out moisturizing by Frequency Converter Control small pump 8 pairs of secondary pipe networks, as secondary returning water pressure reaches desired value, small pump 8 will be closed automatically; the rotating speed of small pump 8 according to actual pressure and the even speed governing of goal pressure, thus avoids small pump 8 impact to secondary pipe network when starting and shut down by intelligent controller.
Automatically can run by pre-set program after unit start, when a pipe network stops heat supply, control system is automatically out of service, and after recovering heat supply, system starts automatically, really realizes unattended duty safe operation, and administrative staff only need timing to patrol to unit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the energy-efficient intelligent control system of heat-exchange unit, described heat-exchange unit comprises a secondary net return pipe, a secondary net feed pipe, secondary network return pipe, secondary network feed pipe, heat exchanger and circulating pump; Hot water, secondary network return pipe that a described secondary net feed pipe carries heating plant heating carry cold water respectively to heat exchanger, and carry out heat exchange in heat exchanger after, the cooled cold water of a described secondary net feed pipe returns heating plant by a secondary net return pipe circular flow, described secondary network feed pipe by secondary network return pipe heating after delivery to user; Described circulating pump is located on secondary network return pipe, for providing power to the water circulation of secondary network feed pipe, secondary network return pipe; It is characterized in that,
Described control system comprises electric control valve, the first pressure and temp transmitter, the second pressure and temp transmitter, outdoor temperature sensor and intelligent control unit; Described electric control valve is located on a secondary net feed pipe, and described first pressure and temp transmitter, the second pressure and temp transmitter are located on a secondary net feed pipe, a secondary net return pipe respectively; Described outdoor temperature sensor is arranged on the outdoor closed on described heat-exchange unit; Described electric control valve, the first pressure and temp transmitter, the second pressure and temp transmitter, outdoor temperature sensor are connected with intelligent control unit signal respectively; Wherein,
Described first pressure and temp transmitter, for monitoring water temperature in a secondary net feed pipe, hydraulic pressure send signal to intelligent control unit in real time;
Described second pressure and temp transmitter, for monitoring water temperature in a secondary net return pipe, hydraulic pressure send signal to intelligent control unit in real time;
Described intelligent control unit, carries out temperature-compensating for the experience adjustment curve changed by outdoor temperature and set, and by controlling to adjust the aperture of described electric control valve, controls the flow of a secondary net feed pipe hot water.
2. the energy-efficient intelligent control system of heat-exchange unit as claimed in claim 1, it is characterized in that, described control system also comprises the 3rd pressure and temp transmitter, the 4th pressure and temp transmitter and circulating pump control device; Described 3rd pressure and temp transmitter, the 4th pressure and temp transmitter are located on secondary network return pipe, secondary network feed pipe respectively, and described 3rd pressure and temp transmitter, the 4th pressure and temp transmitter are connected with intelligent control unit signal respectively, described circulating pump control device is connected with circulating pump, intelligent control unit signal respectively; Wherein,
Described intelligent control unit, the pressure and temperature data also for collecting according to the 3rd pressure and temp transmitter, the 4th pressure and temp transmitter, the experience adjustment curve in conjunction with setting goes out the actual heating load demand of heat user;
Described circulating pump control device, the actual heating load demand for calculating according to described intelligent control unit regulates the rotating speed of circulating pump, controls the water circulation pressure between secondary network return pipe and secondary network feed pipe and flow.
3. the energy-efficient intelligent control system of heat-exchange unit as claimed in claim 2, it is characterized in that, heat-exchange unit also comprises water pipe and small pump; The water side of described water pipe is connected on secondary network feed pipe, and described small pump is located on water pipe;
Described control system also comprises water-replenishing control device; Described water-replenishing control device is connected with described intelligent control unit signal respectively; Wherein,
Whether described intelligent control unit, also for receiving the pressure of return water feedback signal of the 3rd pressure and temp transmitter, and reach desired value according to described signal to pressure of return water in secondary network return pipe and judge;
Described water-replenishing control device, for controlling the switch of small pump, rotating speed according to the judged result of described intelligent control unit.
4. the energy-efficient intelligent control system of heat-exchange unit as claimed in claim 3, it is characterized in that, the foundation of described experience adjustment curve is specially: set up the corresponding relation between outdoor temperature and secondary network supply water temperature according to heat supply experience, draws the experience adjustment curve obtaining outdoor temperature and secondary network supply water temperature according to this corresponding relation.
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| CN114738824A (en) * | 2022-03-07 | 2022-07-12 | 华电湖北发电有限公司武昌热电分公司 | Method and equipment for adjusting energy consumption of central heating system, storage medium and device |
| CN116839091A (en) * | 2023-05-15 | 2023-10-03 | 山东和同信息科技股份有限公司 | Heat exchange station automatic control parameter setting method based on deep learning |
| CN116839091B (en) * | 2023-05-15 | 2024-01-19 | 山东和同信息科技股份有限公司 | Heat exchange station automatic control parameter setting method based on deep learning |
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Application publication date: 20150930 |