CN115218250A - Mixed water heat supply control method and control system - Google Patents
Mixed water heat supply control method and control system Download PDFInfo
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- CN115218250A CN115218250A CN202210877686.7A CN202210877686A CN115218250A CN 115218250 A CN115218250 A CN 115218250A CN 202210877686 A CN202210877686 A CN 202210877686A CN 115218250 A CN115218250 A CN 115218250A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention relates to the technical field of heat supply, in particular to a mixed water heat supply control method and a mixed water heat supply control system. A mixed water heating control method comprises the following steps: s1, when a water mixing and heating control system is started, a water return valve, a water mixing valve and a water supply regulating valve are all opened, and when a heat supply external network runs, the water return valve, the water mixing valve and the water supply regulating valve are regulated to preset opening degrees; s2, when P Supply 2 ‑ΔP＞P 2 coming back When the water is in use, the opening degree of the water return valve is reduced; and S3, adjusting the opening of the water supply adjusting valve according to the temperature requirement of the hot user side, and further changing the water mixing proportion to adjust the temperature of the water inlet end of the hot user side. According to the mixed water heat supply control method, the temperature requirement of a heat user end is met according to the mixed water heat supply control system, the mixed water heat supply control system is simple in structure, the circulation performance of a mixed water pipeline is guaranteed, and the reliability of mixed water heat supply is improved.
Description
Technical Field
The invention relates to the technical field of heat supply, in particular to a mixed water heat supply control method and a mixed water heat supply control system.
Background
In the urban central heating system with sufficient water resources, a water mixing heating mode can be adopted, and the central heating of users is realized. In order to realize better water balance and heat balance and save energy, the existing method mostly adopts a mode of directly supplying water through low-region mixed water, but the existing system structure is complex and cannot ensure the reliability of mixed water heat supply especially when the pressure in a water return pipeline is unstable.
Disclosure of Invention
Technical problem to be solved
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a mixed water heating control method and a control system, which have a simple structure and ensure the reliability of mixed water heating.
(II) technical scheme
In order to achieve the purpose, the invention adopts the main technical scheme that:
the invention provides a mixed water heat supply control method, which comprises the following steps:
s1, when a water mixing and heat supplying control system is started, a water return valve on a primary network water return pipeline, a water mixing valve on a water mixing pipeline and a water supply regulating valve on a primary network water supply pipeline are all opened, when a heat supplying external network operates, the water return valve, the water mixing valve and the water supply regulating valve are adjusted to preset opening degrees, so that the liquid pressure before water mixing of the primary network water supply pipeline and the liquid pressure after water mixing of the primary network water return pipeline are normal values, a variable frequency pump set on the primary network water supply pipeline is put into automatic operation, and the liquid pressure value after water mixing of the primary network water supply pipeline is kept constant;
s2, when P Supply 2 -ΔP＞P 2 coming back When the water return valve is opened, the opening of the water return valve is reduced, otherwise, the opening of the water return valve is kept unchanged, wherein P Supply 2 Is the liquid pressure after water mixing of a primary network water supply pipeline, and is the system resistance pressure drop, P 2 coming back The pressure of the mixed water in the primary net water return pipeline is the pressure of the mixed water;
and S3, adjusting the opening of the water supply adjusting valve according to the temperature requirement of the hot user side, and further changing the water mixing proportion to adjust the temperature of the water inlet end of the hot user side.
Preferably, the mixing valve is adjusted to a preset opening degree according to the outdoor temperature.
Preferably, in step S3, the liquid pressure at the water inlet end of the mixing pipeline should be greater than the liquid pressure at the water outlet end of the mixing pipeline.
Preferably, in step S2, the pressure of the mixed water in the primary network water supply line satisfies the lowest pressure of the cycle reached by the hot user terminal.
The invention also provides a water mixing and heat supplying control system which is used for the water mixing and heat supplying control method, wherein the water mixing and heat supplying control system comprises a primary network water supplying pipeline, a primary network water returning pipeline, a water mixing pipeline, a heat user end and a controller; the water outlet end of the primary network water supply pipeline is communicated with the inlet of the hot user end, and the water inlet end of the primary network water return pipeline is communicated with the outlet of the hot user end; the water inlet end of the water mixing pipeline is communicated with the primary net water return pipeline, and the water outlet end of the water mixing pipeline is communicated with the primary net water supply pipeline; a water mixing valve is arranged on the water mixing pipeline, a water return valve is arranged on one side of the primary net water return pipeline close to the water outlet end of the primary net water return pipeline, and a water supply regulating valve is arranged on one side of the primary net water supply pipeline close to the water inlet end of the primary net water supply pipeline; the primary network water supply pipeline is provided with a first pressure sensor for measuring the pressure of liquid before water mixing, a first temperature sensor for measuring the temperature of the liquid before water mixing, a second pressure sensor for measuring the pressure of the liquid after water mixing, a second temperature sensor for measuring the temperature of the liquid after water mixing and a variable frequency pump set for pressurizing after water mixing; the primary net water return pipeline is provided with a third pressure sensor for measuring the pressure of the liquid after water mixing and a third temperature sensor for measuring the temperature of the liquid after water mixing; the controller is respectively in communication connection with the first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor and the variable-frequency pump set; the controller can receive pressure information of the first pressure sensor, the second pressure sensor and the third pressure sensor when P Supply 2 -ΔP＞P Hui 2 When the water return valve is opened, the controller controls the opening of the water return valve to be reduced, otherwise, the opening of the water return valve is controlled to be kept unchanged, wherein P Supply 2 Is the pressure of the mixed water in the water supply pipeline of the primary network, and is the system resistance pressure drop, P 2 coming back The pressure of the mixed water in the primary net water return pipeline is used.
Preferably, the water supply pipeline of the primary network comprises a first water supply pipe section and a second water supply pipe section which are communicated; the primary network water return pipeline comprises a first water return pipe section and a second water return pipe section which are communicated; the communication position of the first water supply pipe section and the second water supply pipe section forms a first position, and the water outlet end of the second water supply pipe section is communicated with the inlet of the hot user end; the communication position of the first water return pipe section and the second water return pipe section forms a second position, and the water inlet end of the first water return pipe section is communicated with the outlet of the hot user end; the water inlet end of the water mixing pipeline is communicated with the first position, and the water outlet end of the water mixing pipeline is communicated with the second position.
Preferably, the water supply regulating valve is arranged on the first water supply pipe section; the water return valve is arranged on the second water return pipe section.
Preferably, the first temperature sensor and the first pressure sensor are arranged on the first water supply pipe section; the variable frequency pump set, the second temperature sensor and the second pressure sensor are sequentially arranged on the second water supply pipe section; and the third temperature sensor and the third pressure sensor are arranged on the second water return pipe section.
Preferably, a water separator is arranged on the second water supply pipe section; the first water return pipe section is provided with a water collector.
Preferably, the water return valve is a water return butterfly valve; the water mixing valve is a water mixing butterfly valve.
(III) advantageous effects
The invention has the beneficial effects that:
according to the mixed water heat supply control method provided by the invention, the temperature requirement of the heat user side is realized according to the mixed water heat supply control system, the structure of the mixed water heat supply control system is simple, and when P is obtained Supply 2 -ΔP≥P 2 coming back During the time, through reducing the aperture of return water valve, guaranteed the circulation performance of muddy water pipeline, and then improved muddy water heat supply's reliability.
According to the mixed water heat supply control system provided by the invention, the controller can receive the pressure information of the first pressure sensor, the second pressure sensor and the third pressure sensor, and when P is reached Supply 2 -ΔP＞P 2 coming back When the water mixing pipeline is used, the controller controls the opening degree of the water return valve to be reduced, otherwise, the opening degree of the water return valve is controlled to be kept unchanged, the circulation performance of the water mixing pipeline is guaranteed, and the reliability of water mixing heat supply is further improved. Meanwhile, the water mixing heat supply control system can realize heat utilizationThe temperature requirement of the user end, simple structure, and then the part probability of damaging reduces.
Drawings
Fig. 1 is a schematic structural diagram of a mixed heat supply control system according to the present invention.
[ description of reference ]
1: a primary network water supply line; 2: a primary net water return pipeline; 3: a water mixing pipeline; 4: a water supply regulating valve; 5: a water mixing valve; 6: a water return valve; 7: a first pressure sensor; 8: a first temperature sensor; 9: a variable frequency pump set; 10: a second pressure sensor; 11: a second temperature sensor; 12: a third pressure sensor; 13: a third temperature sensor; 14: a water separator; 15: a water collector; 16: and a hot user side.
Detailed Description
In order to better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example one
The embodiment provides a mix hot-water supply control system, including once net water supply pipe way 1, once net return water pipeline 2, muddy water pipeline 3, hot user end 16 and controller.
In this embodiment, the water outlet end of the primary network water supply pipeline 1 is communicated with the inlet of the heat user end 16, the water inlet end of the primary network water return pipeline 2 is communicated with the outlet of the heat user end 16, the water inlet end of the water mixing pipeline 3 is communicated with the primary network water return pipeline 2, and the water outlet end of the water mixing pipeline 3 is communicated with the primary network water supply pipeline 1.
Wherein, be equipped with on the water mixing pipeline 3 and mix water valve 5, be close to the one side of the play water end of once net return water pipeline 2 on once net return water pipeline 2 and be equipped with return water valve 6 and lie in once net return water pipeline 2 pipeline after mixing water promptly, be close to the one side of the end of intaking of once net supply channel 1 on once net supply channel 1 and be equipped with water supply regulating valve 4 and lie in once net supply channel 1 pipeline before mixing water promptly. In this embodiment, the water return valve 6 is preferably a water return butterfly valve, and the water mixing valve 5 is preferably a water mixing butterfly valve, because the butterfly valve has the advantages of simple structure, low material consumption, rapid opening and closing, and small flow resistance, and the system does not have the function of blocking and blocking.
Of course, the primary network water supply pipeline 1 is provided with a first pressure sensor 7 for measuring the liquid pressure before water mixing of the primary network water supply pipeline 1, a first temperature sensor 8 for measuring the liquid temperature before water mixing of the primary network water supply pipeline 1, a second pressure sensor 10 for measuring the liquid pressure after water mixing of the primary network water supply pipeline 1, a second temperature sensor 11 for measuring the liquid temperature after water mixing of the primary network water supply pipeline 1 and a frequency conversion pump set 9 for pressurizing after water mixing. The primary net water return pipeline 2 is provided with a third pressure sensor 12 for measuring the pressure of the liquid mixed in the primary net water return pipeline 2 and a third temperature sensor 13 for measuring the temperature of the liquid mixed in the primary net water return pipeline 2. In order to enable the mixed liquid to stably enter the inlet of the hot user end 16, a variable frequency pump set 9 is arranged. The pressure of the water mixed in the primary network water supply pipeline 1 is the target pressure of the work of the variable frequency pump set 9, and the temperature of the water mixed in the primary network water supply pipeline 1 is the target temperature of the heat supply regulating valve which is properly adjusted according to the outdoor temperature.
In the embodiment, the controller is respectively connected with the first pressure sensor 7, the second pressure sensor 10, the third pressure sensor 12, the first temperature sensor 8, the second temperature sensor 11, the third temperature sensor 13 and the variable frequency pump set 9 in a communication way. The controller can receive pressure information of the first pressure sensor 7, the second pressure sensor 10 and the third pressure sensor 12 when P is Supply 2 -ΔP＞P Hui 2 When the water is in use, the controller controls the opening degree of the water return valve 6 to be reduced, otherwise, the opening degree of the water return valve 6 is controlled to be kept unchanged, wherein P Supply 2 The pressure of the mixed liquid in the primary network water supply pipeline 1 is delta P, the system resistance pressure drop is a known value, P 2 coming back Is the liquid pressure after the water mixing of the primary net water return pipeline 2.
Meanwhile, the controller can receive the temperature information of the first temperature sensor 8, the second temperature sensor 11 and the third temperature sensor 13, and adjust the opening degree of the water supply adjusting valve 4 according to the set temperature requirement of the hot user end 16, so as to change the water mixing proportion to adjust the temperature of the water inlet end of the hot user end 16.
In the mixed water heating control system provided by the embodiment, since the controller can receive the pressure information of the first pressure sensor 7, the second pressure sensor 10 and the third pressure sensor 12, when P is Supply 2 -ΔP＞P 2 coming back When the water mixing pipeline 3 is used, the controller controls the opening degree of the water return valve 6 to be reduced, otherwise, the opening degree of the water return valve 6 is controlled to be kept unchanged, the circulation performance of the water mixing pipeline 3 is guaranteed, and the reliability of mixed water heat supply is improved. Meanwhile, the mixed water heat supply control system can meet the temperature requirement of a heat user side 16, the structure is simple, and the damage probability of components is reduced.
Specifically, the primary network water supply pipeline 1 comprises a first water supply pipe section and a second water supply pipe section which are communicated, and the primary network water return pipeline 2 comprises a first water return pipe section and a second water return pipe section which are communicated. The connection part of the first water supply pipe section and the second water supply pipe section forms a first position, the water outlet end of the second water supply pipe section is connected with the inlet of the hot user end 16, the connection part of the first water return pipe section and the second water return pipe section forms a second position, the water inlet end of the first water return pipe section is connected with the outlet of the hot user end 16, the water inlet end of the water mixing pipeline 3 is connected with the first position, and the water outlet end of the water mixing pipeline 3 is connected with the second position. Wherein, the water supply regulating valve 4 is arranged on the first water supply pipe section, and the water return valve 6 is arranged on the second water return pipe section. The first temperature sensor 8 and the first pressure sensor 7 are arranged on the first water supply pipe section, the frequency conversion pump group 9, the second temperature sensor 11 and the second pressure sensor 10 are sequentially arranged on the second water supply pipe section, and the third temperature sensor 13 and the third pressure sensor 12 are arranged on the second water return pipe section. It should be noted that the first temperature sensor 8 and the first pressure sensor 7 measure the temperature and the pressure before mixing in the water supply line 1 of the primary network. The second temperature sensor 11 and the second pressure sensor 10 measure the temperature and the pressure of the water mixed in the primary network water supply pipeline 1, and the third temperature sensor 13 and the third pressure sensor 12 measure the temperature and the pressure of the water mixed in the primary network water return pipeline 2. The pressure and the temperature of the liquid at the first position on the primary network water supply pipeline 1 are the pressure and the temperature before water mixing, and the pressure and the temperature of the liquid at the second position on the primary network water return pipeline 2 are the pressure and the temperature after water mixing.
Specifically, a water separator 14 is arranged on the second water supply pipe section, and a water collector 15 is arranged on the first water return pipe section. The water in the main pipe is distributed according to the flow rate of the water distributor 14, the flow rate of each regional branch loop is ensured to meet the load requirement, the water flow of each branch loop is collected by the water collector 15 and is input into the backwater main pipe, and the circular operation is realized.
Example two
The invention provides a mixed water heat supply control method, which comprises the following steps:
s1, when the water mixing and heat supplying control system is started, a water return valve 6 on a primary network water return pipeline 2, a water mixing valve 5 on a water mixing pipeline 3 and a water supply regulating valve 4 on a primary network water supply pipeline 1 are all opened, when a heat supplying external network operates, the water return valve 6, the water mixing valve 5 and the water supply regulating valve 4 are adjusted to preset opening degrees, so that the liquid pressure before water mixing of the primary network water supply pipeline 1 and the liquid pressure after water mixing of the primary network water return pipeline 2 are normal values, a variable frequency pump set 9 on the primary network water supply pipeline 1 is put into automatic operation, the liquid pressure value after water mixing of the primary network water supply pipeline 1 is kept constant, the optimal economic flow is kept at the moment, and the water mixing and heat supplying control system has the condition of realizing quality regulation by changing the liquid temperature after water mixing of the primary network water supply pipeline 1, namely the temperature of an inlet of a heat user side 16.
In this embodiment, the circulation minimum pressure that heat user end 16 reached is satisfied to the liquid pressure behind the muddy water of a network water supply pipeline 1, mix the aperture according to outdoor temperature adjustment preset by water valve 5, mix water valve 5's effect and mix cold water in the hot water that supplies with heat user end 16, in deep cold period, heat user end 16 is the biggest to heat load's demand, mix water valve 5 aperture and reach and preset the minimum, in heat supply initial stage, heat user end 16 is minimum to heat load's demand, mix water valve 5 aperture and reach and preset the maximum. Therefore, a proper preset opening value can be obtained according to a test, and the automatic adjustment of the water supply adjusting valve 4 can be ensured to always keep the valve working in a proper and effective opening range;
s2, when P Supply 2 -ΔP＞P 2 coming back When the pressure of the liquid at the second position on the primary net water return pipeline 2 is smaller, the opening degree of the water return valve 6 is reduced, the throttling pressure on the primary net water return pipeline 2 is suppressed, the pressure at the second position on the primary net water return pipeline 2 is increased, the circulation performance of the liquid in the water mixing pipeline 3 from the water inlet end to the water outlet end is guaranteed, the reliability of mixed water heat supply is further improved, otherwise, the opening degree of the water return valve 6 is kept unchanged, wherein P Supply 2 Is the pressure of the mixed water in the primary network water supply pipeline 1, and is the system resistance pressure drop, P 2 coming back The pressure of the mixed water in the primary net water return pipeline 2 is the pressure of the mixed water;
and S3, adjusting the opening of the water supply adjusting valve 4 according to the temperature requirement of the hot user end 16, and further changing the water mixing proportion to adjust the temperature of the water inlet end of the hot user end 16.
In step S3, the liquid pressure at the water inlet end of the water mixing pipeline 3 should be greater than the liquid pressure at the water outlet end of the water mixing pipeline 3. In the practical application process, when the inlet temperature of the hot user end 16 needs to be reduced, the water supply regulating valve 4 is turned off, the water supply flow is reduced, the liquid pressure at the first position on the water supply pipeline 1 of the primary network is reduced, and the liquid flow in the water mixing pipeline 3 is increased, so that the stability is approached.
It should be noted that, in the process of heat supply regulation, the temperature of the mixed liquid in the primary network water supply pipeline 1, i.e. the set value of the temperature at the inlet of the heat user end 16, is set according to the requirement of the worst heat user, and is changed along with the change of the climate condition, so that the heat load requirement of the user is met and stabilized, and the optimal supply is realized.
In order to meet the optimal heat load supply, the mixed water heating control system realizes the automatic adjustment of the temperature of the inlet of the heat user end 16 by the following modes: firstly, through the change of the liquid temperature before the muddy water of a net water supply pipeline 1, secondly through the change of muddy water proportion.
Generally, the liquid temperature before water mixing of the primary network water supply pipeline 1 is automatically adjusted along with a heat load scheduling instruction, so that the system heat load demand change caused by the environment temperature change is adapted. For the system, the method belongs to disturbance factors.
During normal operation of the entire heating system, the heat source supply is designed to be greater than the heat load demand of the heat user terminals 16. In engineering applications, the heating capacity of the system is designed to exceed the demand of the user, so the heat load supply to the user is an interval function of the water-mixing ratio.
In order to achieve the purpose of economically scheduling the heat load, a valve opening setting test needs to be completed:
in the initial stage and the final stage of the system operation, when the water mixing valve 5 is fully opened, the water supply regulating valve 4 is closed to a certain small opening degree from an open state, so that the supply of the heat load reaches a proper lower limit. It should be noted that the system can realize the maximum heat load supply capability in the state where the mixing valve 5 is fully closed and the water supply adjusting valve 4 is fully opened, and the system can realize the minimum heat load supply capability in the state where the mixing valve 5 is fully opened and the water supply adjusting valve 4 is fully closed.
In the deep cold period of the system, when the water supply regulating valve 4 is fully opened, the water mixing valve 5 is opened to a certain small opening degree from a fully closed state, so that the heat load is expected to be supplied properly. However, due to the disturbance factor of the liquid temperature before water mixing in the primary network water supply pipeline 1, when the water supply regulating valve 4 is fully opened, the water mixing valve 5 is gradually opened from a fully closed state to a fully opened state, and the requirement of the heat load is still exceeded. At this time, the water mixing valve 5 is kept fully opened, and the water supply regulating valve 4 is closed from the fully opened state to a certain large opening degree, thereby achieving a suitable upper limit of the supply of the heat load. In other words, the position of the mixing valve 5 is changed only to distinguish the difference in the heat load supply capacity of the system. The temperature of the liquid before the water mixing of the primary network water supply pipeline 1 is kept constant, and the constant temperature is realized by automatically adjusting the water supply adjusting valve 4.
In the mixed water heating control method provided in this embodiment, the mixed water heating control system realizes the temperature requirement of the heat user terminal 16 according to the mixed water heating control systemSimple structure, when P Supply 2 -ΔP≥P Chinese character hui 2, through reducing the aperture of return water valve 6, guaranteed the circulation performance of mixing water pipeline 3, and then improved the reliability of mixing the water heat supply, and simple to the heat supply regulation control method of heat user side 16, easy operation.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; either as communication within the two elements or as an interactive relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, a first feature may be "on" or "under" a second feature, and the first and second features may be in direct contact, or the first and second features may be in indirect contact via an intermediate. Also, a first feature "on," "above," and "over" a second feature may be directly or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lower level than the second feature.
In the description herein, the description of the terms "one embodiment," "some embodiments," "an embodiment," "an example," "a specific example" or "some examples" or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and not to be construed as limiting the present invention and that those skilled in the art may make modifications, alterations, substitutions and alterations to the above embodiments within the scope of the present invention.
Claims (10)
1. A mixed water heating control method is characterized by comprising the following steps:
s1, when a water mixing and heat supplying control system is started, a water return valve on a primary network water return pipeline, a water mixing valve on a water mixing pipeline and a water supply regulating valve on a primary network water supply pipeline are all opened, when a heat supplying external network runs, the water return valve, the water mixing valve and the water supply regulating valve are regulated to preset opening degrees, so that the liquid pressure before water mixing of the primary network water supply pipeline and the liquid pressure after water mixing of the primary network water return pipeline are normal values, a variable frequency pump set on the primary network water supply pipeline is put into automatic operation, and the liquid pressure after water mixing of the primary network water supply pipeline is kept constant;
s2, when P Supply 2 -ΔP＞P 2 coming back When the water return valve is opened, the opening degree of the water return valve is reduced, otherwise, the opening degree of the water return valve is kept unchanged, wherein P is Supply 2 Is the pressure of the mixed water in the primary network water supply pipeline, and is the system resistance pressure drop, P Hui 2 Is said toThe liquid pressure of the secondary net water return pipeline after water mixing;
and S3, adjusting the opening of the water supply adjusting valve according to the temperature requirement of the hot user side, and further changing the water mixing proportion to adjust the temperature of the water inlet end of the hot user side.
2. The mixed heat supply control method according to claim 1, characterized in that:
the water mixing valve adjusts the preset opening according to the outdoor temperature.
3. The mixed heat supply control method according to claim 1, wherein:
in step S3, the liquid pressure at the water inlet end of the water mixing pipeline is greater than the liquid pressure at the water outlet end of the water mixing pipeline.
4. The mixed heat supply control method according to claim 1, characterized in that:
in step S2, the pressure of the mixed water in the primary network water supply line satisfies the lowest pressure of the hot user terminal.
5. A mixed heat supply control system, which is used in the mixed heat supply control method according to any one of claims 1 to 4, and comprises a primary network water supply pipeline, a primary network water return pipeline, a mixed water pipeline, a heat user end and a controller;
the water outlet end of the primary network water supply pipeline is communicated with the inlet of the hot user end, and the water inlet end of the primary network water return pipeline is communicated with the outlet of the hot user end;
the water inlet end of the water mixing pipeline is communicated with the primary net water return pipeline, and the water outlet end of the water mixing pipeline is communicated with the primary net water supply pipeline;
a water mixing valve is arranged on the water mixing pipeline, a water return valve is arranged on one side of the primary network water return pipeline, which is close to the water outlet end of the primary network water return pipeline, and a water supply regulating valve is arranged on one side of the primary network water supply pipeline, which is close to the water inlet end of the primary network water supply pipeline;
the primary network water supply pipeline is provided with a first pressure sensor for measuring the pressure of liquid before water mixing, a first temperature sensor for measuring the temperature of the liquid before water mixing, a second pressure sensor for measuring the pressure of the liquid after water mixing, a second temperature sensor for measuring the temperature of the liquid after water mixing and a variable frequency pump set for pressurizing after water mixing;
the primary net water return pipeline is provided with a third pressure sensor for measuring the pressure of the liquid after water mixing and a third temperature sensor for measuring the temperature of the liquid after water mixing;
the controller is respectively in communication connection with the first pressure sensor, the second pressure sensor, the third pressure sensor, the first temperature sensor, the second temperature sensor, the third temperature sensor and the variable-frequency pump group;
the controller is capable of receiving pressure information from the first pressure sensor, the second pressure sensor, and the third pressure sensor when P is Supply 2 -ΔP＞P 2 coming back When the water return valve is opened, the controller controls the opening degree of the water return valve to be reduced, otherwise, the opening degree of the water return valve is controlled to be kept unchanged, wherein P Supply 2 Is the pressure of the mixed water in the water supply pipeline of the primary network, and is the system resistance pressure drop, P 2 coming back Is the liquid pressure after the water is mixed in the primary net water return pipeline.
6. A mixed heat supply control system as claimed in claim 5,
the primary network water supply pipeline comprises a first water supply pipe section and a second water supply pipe section which are communicated;
the primary network water return pipeline comprises a first water return pipe section and a second water return pipe section which are communicated;
the communication position of the first water supply pipe section and the second water supply pipe section forms a first position, and the water outlet end of the second water supply pipe section is communicated with the inlet of the hot user end;
the communication position of the first water return pipe section and the second water return pipe section forms a second position, and the water inlet end of the first water return pipe section is communicated with the outlet of the hot user end;
the water inlet end of the water mixing pipeline is communicated with the first position, and the water outlet end of the water mixing pipeline is communicated with the second position.
7. A mixed heat supply control system as claimed in claim 6,
the water supply regulating valve is arranged on the first water supply pipe section;
the water return valve is arranged on the second water return pipe section.
8. The mixed heat supply control system of claim 6,
the first temperature sensor and the first pressure sensor are arranged on the first water supply pipe section;
the variable-frequency pump group, the second temperature sensor and the second pressure sensor are sequentially arranged on the second water supply pipe section;
the third temperature sensor and the third pressure sensor are arranged on the second water return pipe section.
9. A mixed heat supply control system as claimed in claim 6,
a water separator is arranged on the second water supply pipe section;
and a water collector is arranged on the first water return pipe section.
10. A mixed heat supply control system as claimed in claim 5,
the water return valve is a water return butterfly valve;
the water mixing valve is a water mixing butterfly valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210877686.7A CN115218250A (en) | 2022-07-25 | 2022-07-25 | Mixed water heat supply control method and control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210877686.7A CN115218250A (en) | 2022-07-25 | 2022-07-25 | Mixed water heat supply control method and control system |
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| CN115218250A true CN115218250A (en) | 2022-10-21 |
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| CN202210877686.7A Pending CN115218250A (en) | 2022-07-25 | 2022-07-25 | Mixed water heat supply control method and control system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019156300A1 (en) * | 2018-02-07 | 2019-08-15 | 케이에이치이주식회사 | Heating water pressure control apparatus for plurality of buildings |
| CN209540985U (en) * | 2019-01-15 | 2019-10-25 | 北京市热力集团有限责任公司门头沟分公司 | Mixed water heat exchange heating system |
| CN210373657U (en) * | 2019-08-13 | 2020-04-21 | 山东知能自动化设备有限公司 | Intelligent building water mixing heat supply unit |
| CN211952936U (en) * | 2020-04-16 | 2020-11-17 | 石家庄诚峰热电有限公司 | Multifunctional water mixing and heating system |
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2022
- 2022-07-25 CN CN202210877686.7A patent/CN115218250A/en active Pending
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|---|---|---|---|---|
| WO2019156300A1 (en) * | 2018-02-07 | 2019-08-15 | 케이에이치이주식회사 | Heating water pressure control apparatus for plurality of buildings |
| CN209540985U (en) * | 2019-01-15 | 2019-10-25 | 北京市热力集团有限责任公司门头沟分公司 | Mixed water heat exchange heating system |
| CN210373657U (en) * | 2019-08-13 | 2020-04-21 | 山东知能自动化设备有限公司 | Intelligent building water mixing heat supply unit |
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