CN110925854A - Flow regulation method and system for improving hydraulic imbalance of secondary heat supply network - Google Patents

Flow regulation method and system for improving hydraulic imbalance of secondary heat supply network Download PDF

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Publication number
CN110925854A
CN110925854A CN201911211436.4A CN201911211436A CN110925854A CN 110925854 A CN110925854 A CN 110925854A CN 201911211436 A CN201911211436 A CN 201911211436A CN 110925854 A CN110925854 A CN 110925854A
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flow
valve
water inlet
heat supply
valve opening
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CN110925854B (en
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李明
刘培栋
张鸿泉
刘占辉
张盼
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Rundian Energy Science and Technology Co Ltd
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Rundian Energy Science and Technology Co Ltd
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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
    • F24D3/1066—Distributors for heating liquids
    • 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
    • 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
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/13—Heat from a district heating network
    • 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
    • F24D2220/00—Components of central heating installations excluding heat sources
    • F24D2220/02—Fluid distribution means
    • F24D2220/0271—Valves

Abstract

The invention discloses a flow regulation method and a flow regulation system for improving hydraulic imbalance of a secondary heat supply network, wherein the secondary heat supply network comprises a plurality of water inlet branches and user side heat supply pipelines, and each water inlet branch is communicated with a plurality of user side heat supply pipelines; each water inlet branch is communicated with an intelligent flow balance valve, and each user side heat supply pipeline is communicated with a static flow balance valve; the flow regulating method comprises the steps of measuring the pressure difference value of inlet water and return water of each water inlet branch; measuring the valve flow value of each water inlet branch; calculating the actual pipeline resistance value of the water inlet branch where each intelligent flow balance valve is located by using the water inlet and return pressure difference value and the valve flow value; calculating the target valve opening of each intelligent flow balance valve by using the actual pipeline resistance value; and adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening. The technical scheme of the invention aims to solve the problems that in the prior art, the heat supply mode is energy-wasting and low in energy efficiency, and user experience is influenced.

Description

Flow regulation method and system for improving hydraulic imbalance of secondary heat supply network
Technical Field
The invention relates to the technical field of central heating, in particular to a flow regulation method and a flow regulation system for improving hydraulic imbalance of a secondary heating network.
Background
The central heating system is a system for supplying steam or hot water generated by a central heat source to heat required for production, heating and life of a city or a part of areas through a pipe network. The centralized heating system mainly comprises a heat source plant, a primary heating network, a heat exchanger, a secondary heating network and the like; wherein, the secondary heat supply network directly supplies heat to users.
In the secondary heat supply network part of the central heating system, some conditions that the room temperature of some users does not reach the standard due to the fact that the flow of the users cannot reach the designed flow value often exist among all heat users and all heat dissipation devices, and the condition that the room temperature of the users does not reach the standard is generally called hydraulic imbalance. The essential reason for causing hydraulic imbalance is that the secondary heat supply network has defects in design and operation, so that the actual heat supply flow is not balanced with the design flow under the condition that the secondary heat supply network has pressure loss.
Hydraulic imbalance can cause overheating of the near end in a user room and substandard far end temperature; in order to solve the problem, a heat supply company adopts a heat supply mode of increasing the output of a water pump or adopting large flow and small temperature difference to supply heat to users by taking the purpose of meeting the requirement of the most adverse end as a target. The two heating modes can cause energy waste in two aspects of heat and water pump power consumption, and even cause the energy efficiency of a heating network of a centralized heating system to be generally low in actual conditions, and the energy efficiency is about 30-40%; meanwhile, the above heating mode may cause the comfort and satisfaction of users to be reduced due to the overhigh heating temperature.
Disclosure of Invention
The invention provides a flow regulation method and a flow regulation system for improving hydraulic imbalance of a secondary heat supply network, and aims to solve the problems that energy waste and low energy efficiency are caused by a heat supply mode provided by the prior art, and the user experience effect is influenced.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a flow rate regulation method for improving hydraulic imbalance of a secondary heat supply network, wherein the secondary heat supply network includes a plurality of water inlet branches and user side heat supply pipelines, and each water inlet branch is communicated with a plurality of user side heat supply pipelines; each water inlet branch is communicated with an intelligent flow balance valve, and each user side heat supply pipeline is communicated with a static flow balance valve;
the flow regulation method for improving hydraulic imbalance of the secondary heat supply network comprises the following steps:
measuring the pressure difference of inlet water and return water of the water inlet branch where each intelligent flow balance valve is located to obtain an actually measured pressure difference value of the inlet water and the return water;
measuring the valve flow of the water inlet branch where each intelligent flow balance valve is located to obtain an actually measured valve flow value;
calculating the actual pipeline resistance value of the water inlet branch where each intelligent flow balance valve is located according to the relation among the water inlet and return pressure difference, the valve flow and the pipeline resistance by using the actually measured inlet and return water pressure difference value and the actually measured valve flow value;
calculating the target valve opening of each intelligent flow balance valve according to the relationship between the pipeline resistance and the valve opening by using the actual pipeline resistance value;
and adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening so as to stabilize the actual flow of the user end heat supply pipeline in the secondary heat supply network within the designed flow range.
Preferably, the secondary heat supply network further comprises a heat exchanger and a main water inlet pipeline communicated with the heat exchanger, wherein the main water inlet pipeline is communicated with the plurality of water inlet branches;
the flow regulating method, after the step of regulating the actual valve opening of the intelligent flow balance valve to the target valve opening, further comprises:
measuring a change value of an external disturbance factor, wherein the external disturbance factor is an external factor interfering the heat load of the secondary heat supply network;
estimating the heat load deviation of the secondary heat supply network according to a heat load function between the external disturbance factor and the heat load by using the change value of the external disturbance factor;
judging whether the heat load deviation of the secondary heat supply network is within a preset heat load deviation range;
and if the heat load deviation is judged to be within the preset heat load deviation range, adjusting the heat exchange parameters of the heat exchanger according to the relationship between the heat load of the secondary heat supply network and the heat exchange parameters of the heat exchanger so as to eliminate the heat load deviation.
Preferably, the secondary heat supply network further comprises a circulating water pump communicated with the main water inlet pipeline;
the flow regulating method further comprises the following steps after the step of judging whether the heat load deviation of the secondary heat supply network is within the preset heat load deviation range:
if the heat load deviation is judged to exceed the preset heat load deviation range, calculating a water pump flow adjustment value of the circulating water pump according to the relationship between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump;
and adjusting the water pump flow of the circulating water pump by using the water pump flow adjusting value so as to adjust the heat load deviation to be within the preset heat load deviation range.
Preferably, after the step of adjusting the water pump flow rate of the circulation water pump, the flow rate adjusting method further includes:
calculating a first valve opening change value of each intelligent flow balance valve corresponding to the water pump flow adjustment value according to the functional relation between the water pump flow of the circulating water pump and the valve opening of the intelligent flow balance valve;
and adjusting the valve opening of each intelligent flow balance valve by using the first valve opening change value.
Preferably, before the step of adjusting the valve opening of each intelligent flow balance valve, the method further comprises:
measuring the indoor temperature of a user side in a preset time period to obtain a room temperature change value;
calculating a second valve opening degree change value of each intelligent flow balance valve corresponding to the room temperature change value according to a functional relation between the user side indoor temperature and the valve opening degree of the intelligent flow balance valve by using the room temperature change value;
and respectively adjusting the valve opening of each intelligent flow balance valve by using the second valve opening change value and the corresponding weight as well as the first valve opening change value and the corresponding weight.
According to the second aspect of the present invention, there is also provided a flow regulating system for improving hydraulic imbalance of a secondary heat supply network, the secondary heat supply network comprising a plurality of water inlet branches and a plurality of user side heat supply pipelines respectively communicated with each water inlet branch;
wherein, this a flow control system for improving secondary heating network hydraulic power is unregulated includes:
the intelligent flow balance valves are respectively communicated with each water inlet branch and are used for adjusting the flow of the water inlet branch where the intelligent flow balance valves are located; and the number of the first and second groups,
the static flow balance valve is respectively communicated with each user side heat supply pipeline and is used for stabilizing the flow of the user side heat supply pipeline where the static flow balance valve is located;
the first pressure sensor is communicated with the main water inlet pipeline and is used for measuring the water inlet pressure of the water inlet branch where each intelligent flow balance valve is located; and the number of the first and second groups,
the second pressure sensor is communicated with the water outlet end of the intelligent flow balance valve and is used for measuring the return water pressure of the water inlet branch where each intelligent flow balance valve is located;
the flowmeter is communicated with the main water inlet pipeline and is used for measuring the valve flow of the water inlet branch where each intelligent flow balance valve is located to obtain an actually measured valve flow value;
the control terminal is electrically connected with the intelligent flow balance valve, the static flow balance valve, the first pressure sensor and the second pressure sensor respectively; wherein the content of the first and second substances,
the control terminal comprises:
the water inlet and return pressure difference calculation module is used for calculating the water inlet and return pressure difference of the water inlet branch where each intelligent flow balance valve is located according to the water inlet pressure and the water return pressure to obtain an actually measured water inlet and return pressure difference value;
the pipeline resistance calculation module is used for calculating the actual pipeline resistance value of the water inlet branch where each intelligent flow balance valve is located according to the relation among the water inlet and return pressure difference value, the valve flow and the pipeline resistance by using the actually measured water inlet and return pressure difference value and the actually measured valve flow value;
the valve opening calculation module is used for calculating the target valve opening of each intelligent flow balance valve according to the relationship between the pipeline resistance and the valve opening by using the actual pipeline resistance value;
and the valve opening adjusting module is used for adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening so as to enable the actual flow of the user end heat supply pipeline in the secondary heat supply network to be stable within a designed flow range.
Preferably, the secondary heat supply network further comprises a heat exchanger and a main water inlet pipeline communicated with the heat exchanger, and the main water inlet pipeline is communicated with the plurality of water inlet branches;
the flow regulating system further comprises:
the external disturbance factor measuring sensor is used for measuring a change value of an external disturbance factor, and the external disturbance factor is an external factor which interferes with the heat load of the secondary heat supply network;
the control terminal still includes:
the heat load deviation estimation module is used for estimating the heat load deviation of the secondary heat supply network according to a heat load function between the external disturbance factor and the heat load by using the change value of the external disturbance factor;
the heat load deviation judging module is used for judging whether the heat load deviation of the secondary heat supply network is within a preset heat load deviation range or not;
and the heat exchange parameter adjusting module is used for adjusting the heat exchange parameters of the heat exchanger according to the relationship between the heat load of the secondary heat supply network and the heat exchange parameters of the heat exchanger when the heat load deviation judging module judges that the heat load deviation is within the preset heat load deviation range so as to eliminate the heat load deviation.
Preferably, the secondary heat supply network further comprises a circulating water pump communicated with the main water inlet pipeline; the control terminal further includes:
the water pump flow calculation module is used for calculating a water pump flow adjustment value of the circulating water pump according to the relation between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump when the heat load deviation judgment module judges that the heat load deviation exceeds the preset heat load deviation range;
and the water pump flow regulating module is used for regulating the water pump flow of the circulating water pump by using the water pump flow regulating value so as to regulate the heat load deviation to be within a preset heat load deviation range.
Preferably, the valve opening calculation module is further configured to calculate a first valve opening variation value of each intelligent flow balance valve corresponding to the water pump flow adjustment value according to a functional relationship between the water pump flow of the circulating water pump and the valve opening of the intelligent flow balance valve;
and the valve opening adjusting module is also used for adjusting the valve opening of each intelligent flow balance valve by using the first valve opening change value.
Preferably, the flow rate regulation system further includes: the room temperature measuring sensor is used for measuring the indoor temperature of the user side within a preset time period to obtain a room temperature change value;
the valve opening calculation module is also used for calculating a second valve opening change value of each intelligent flow balance valve corresponding to the room temperature change value according to the functional relation between the indoor temperature of the user side and the valve opening of the intelligent flow balance valve by using the room temperature change value;
and the valve opening adjusting module is also used for respectively adjusting the valve opening of each intelligent flow balance valve by using the second valve opening change value and the corresponding weight as well as the first valve opening change value and the corresponding weight.
According to the flow regulating method for improving the hydraulic imbalance of the secondary heat supply network, provided by the technical scheme of the invention, the actually measured pressure difference value of the inlet water and the actual water can be obtained by measuring the pressure difference of the inlet water and the return water of the inlet water branch where each intelligent flow balance valve is located; and measuring the valve flow of the water inlet branch of each intelligent flow balance valve to obtain an actual measured valve flow value, using the actual measured water inlet and return pressure difference value and the actual measured valve flow value, then according to the relation among the water inlet and return pressure difference, the valve flow and the pipeline resistance, obtaining the actual pipeline resistance value of the water inlet branch of each intelligent flow balance valve, namely obtaining the pressure loss of the water inlet branch of the secondary heat supply network, adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening according to the actual pipeline resistance, adjusting the flow of the water inlet branch of the intelligent flow balance valve to enable the actual flow of the water inlet branch to reach the set flow value, wherein the static flow balance valve communicated with the heat supply pipeline of each user end is a self-operated adjusting valve, and can perform self-operated adjustment by leaning on the system pressure difference and the self spring to ensure that the flow is stable at the design flow, the hydraulic balance can be achieved as soon as possible without being influenced by other pipeline pressure changes. Compared with the technical scheme of adopting a heat supply mode of increasing the output of a water pump or adopting large flow and small temperature difference for heat supply mentioned in the background technology, the scheme can accurately adjust the actual flow of the water inlet branch to reach a set flow value, and enables the indoor pipeline to reach hydraulic balance through self-operated adjustment of the static flow balance valve. Therefore, the problems that energy waste and low energy efficiency are caused by a heat supply mode provided by the prior art and the user experience effect is influenced are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a secondary heat supply network according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a flow regulating system for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an intelligent flow balance valve according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a first flow regulation method for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of a second flow regulation method for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a third flow regulation method for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention;
fig. 7 is a schematic flow chart of a fourth flow regulation method for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention;
fig. 8 is a schematic flow chart of a fifth flow regulation method for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a variable flow rate regulation control system according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a control terminal in a first flow rate regulation system according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a control terminal in a second flow rate regulation system according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a control terminal in a third flow rate regulation system according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a control terminal in a fourth flow rate adjustment system according to an embodiment of the present invention.
The reference numbers illustrate:
Figure BDA0002297164640000061
Figure BDA0002297164640000071
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; "connected" may be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. 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 addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a secondary heat supply network according to an embodiment of the present invention. As shown in fig. 1, the secondary heat supply network according to the embodiment of the present invention includes:
the system comprises a heat exchanger 1, a water inlet main pipeline 2, a plurality of water inlet branch pipelines 3, a user side heat supply pipeline 4, a plurality of water return branch pipelines 5 and a water return main pipeline 6; wherein the content of the first and second substances,
the water inlet main pipeline 2 is communicated with the heat exchanger 1;
a plurality of water inlet branches 3 are communicated with the main water inlet pipeline 2, wherein each water inlet branch 3 is communicated with a plurality of user side heat supply pipelines 4;
the number of the multiple water return branches 5 corresponds to that of the water inlet branches 3, and each water return branch 5 is communicated with multiple user side heat supply pipelines 4;
the water return main pipeline 6 is communicated with the plurality of water return branch pipelines 5, and the water return main pipeline 6 is also communicated with the heat exchanger 1.
In the technical scheme provided by the embodiment of the invention, at the end of a heat exchanger 1, a secondary heat supply network and a primary heat supply network realize heat exchange, hot water is conveyed into a plurality of water inlet branch circuits 3 through a water inlet main pipeline 2, and flows into a plurality of user side heat supply pipelines 4 communicated with each water inlet branch circuit 3 through each water inlet branch circuit 3 of the plurality of water inlet branch circuits 3, so that heat supply in a user side room is realized, after heat supply in the user side room, hot water with a relatively cold temperature flows into a water return main pipeline 6 through a water return branch circuit 5 communicated with the user side heat supply pipelines 4, and then flows to the heat exchanger 1 through the water return main pipeline 6, and secondary heating is carried out in the heat exchanger 1.
In a traditional secondary heat supply network, the situation that the room temperature of a user does not reach the standard due to the fact that the flow of the user does not reach a designed flow value often occurs, namely hydraulic imbalance; in the prior art, the heat is supplied by adopting a heat supply mode of increasing the output of a water pump or large flow and small temperature difference, so that energy waste and low energy efficiency are caused.
In order to solve the above problem, referring to fig. 2, in the flow regulating system for improving hydraulic imbalance of the secondary heat supply network provided by the embodiment of the present application, in the above conventional secondary heat supply network, an intelligent flow balancing valve 8 is communicated to each water inlet branch 3 for regulating the flow of the water inlet branch 3 where the intelligent flow balancing valve 8 is located; each user side heat supply pipeline 4 is communicated with a static flow balance valve 9 for stabilizing the flow of the user side heat supply pipeline 4 where the static flow balance valve 9 is located; the water inlet main pipeline 2 is communicated with a first pressure sensor 10 which is used for measuring the water inlet pressure of the water inlet branch 3 where each intelligent flow balance valve 8 is located; a second pressure sensor 11 is communicated with a pipeline at the water outlet end of each intelligent flow balance valve 8 and is used for measuring the return water pressure of the water inlet branch 3 where each intelligent flow balance valve 8 is located; and the main water inlet pipeline 2 is communicated with a flowmeter 12 for measuring the valve flow of the water inlet branch 3 where each intelligent flow balance valve 8 is positioned to obtain an actually measured valve flow value. The flow meter 12 may be an ultrasonic flow meter.
In the flow rate adjusting scheme shown in fig. 2, the actually measured intake and return water pressure difference value and the actually measured valve flow rate value can be obtained through the connection structure; by utilizing the measured water inlet and return pressure difference value and the measured valve flow value, the actual pipeline resistance value of the water inlet branch 3 where each intelligent flow balance valve 8 is located can be calculated; by using the actual pipeline resistance value, the target valve opening of each intelligent flow balance valve 8 can be calculated, so that the actual valve opening of each intelligent flow balance valve 8 is adjusted to the target valve opening, and the actual flow of the user-end heat supply pipeline 4 in the secondary heat supply network is stabilized within the design flow range.
As can be known from the background art, the essential reason for causing hydraulic imbalance is that the pressure loss exists in the secondary heat supply network, so that the actual heat supply flow of the user-side heat supply pipeline 4 cannot reach the designed flow. In the technical scheme provided by the embodiment of the application, the actual pipeline resistance value of the water inlet branch 3, namely the pressure loss of the secondary heat supply network, is obtained by using the actual measurement water inlet and return water pressure difference value and the actual measurement valve flow value obtained by actual measurement; the target valve opening is calculated by using the pipeline resistance value, and the actual flow of the user side heat supply pipeline 4 caused by pressure loss can be compensated, so that the actual flow reaches the design flow range.
Referring to fig. 3, a specific structure of the intelligent flow balance valve 8 according to the embodiment of fig. 2 is shown in fig. 3, where the intelligent flow balance valve 8 is a self-operated flow balance valve, and includes: a first spool 82, a second spool 83, a spring 84, a diaphragm 85, and a pressure take-off orifice 86,
and this formula of relying on oneself flow balance valve is gone up to install additional electric actuator 81, both can have the invariable of automatic assurance flow when system pressure and flow exist undulant, guarantee the validity of secondary heat supply network primary adjustment, can carry out effectual secondary control according to external environment's change again.
In addition, the static flow balance valve 9 of the embodiment shown in fig. 2 can act to distribute the flow proportionally in the system, with the flow characteristic approximating a primary curve. When the line resistance of the user end is constant, the flow characteristic is generally kept constant. In addition, the static flow balance valve 9 can save investment.
In the following embodiments of the present application, as shown in fig. 2 and 3, the flow of primary regulation and secondary regulation is provided for hydraulic imbalance of the secondary heat supply network. The initial adjustment method comprises the following steps: setting the initial flow of the intelligent flow balance valve 8, respectively measuring the actual differential pressure and the actual flow of the secondary heat supply network pipeline by adopting a pressure gauge and an ultrasonic flowmeter, adjusting an electric actuator 81 of the intelligent flow balance valve 8, and changing the opening of a valve core 1 of the intelligent flow balance valve to enable the flow to reach a set value; then when other intelligent flow balance valves 8 are adjusted, the valve core 2 is adjusted by the system pressure difference and the spring 84 in a self-operated manner, the flow of the water inlet branch 3 is ensured to be equal to a set value and not to be changed, and the hydraulic balance can be achieved as soon as possible without being influenced by the pressure change of other branches.
Specific flow regulation method referring to fig. 4, fig. 4 is a first flow regulation method for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present invention. The method provided by the embodiment shown in fig. 4 is based on the flow regulation system shown in fig. 2, and in the embodiment shown in fig. 2, an intelligent flow balance valve 8 is communicated with each water inlet branch 3, and a static flow balance valve 9 is communicated with each user side heat supply pipeline 4.
As shown in fig. 4, the flow regulation method for improving hydraulic imbalance of the secondary heat supply network comprises the following steps:
s110: and measuring the pressure difference of the inlet water and the return water of the inlet water branch 3 where each intelligent flow balance valve 8 is located to obtain the actually measured pressure difference value of the inlet water and the return water.
Referring to fig. 2, the measurement of the water inlet and return pressure difference is obtained by measuring a first pressure sensor 10 communicated with the water inlet main pipeline 2 and a second pressure sensor 11 communicated with a pipeline at the water outlet end of each intelligent flow balance valve 8, and the actually measured water inlet and return pressure difference can be quickly obtained by measuring the water inlet pressure and the water return pressure by the two pressure sensors. Because the pipeline resistance is in direct proportion to the water inlet and return pressure difference, the water inlet and return pressure difference of the water inlet branch 3 where the intelligent flow balance valve 8 is located is obtained, and the pipeline resistance of the water inlet branch 3 can be conveniently calculated.
S120: and measuring the valve flow of the water inlet branch 3 where each intelligent flow balance valve 8 is positioned to obtain an actually measured valve flow value.
Referring to fig. 2, the measurement of the valve flow is obtained by measuring the flow meter 12 connected to the main water inlet pipeline 2, and the flow meter 12 can measure the valve flow of the water inlet branch 3 where each intelligent flow balance valve 8 is located, so as to obtain a measured valve flow value. Because the pipeline resistance is inversely proportional to the valve flow value, i.e. the square of the valve flow of the water inlet branch 3, the pipeline resistance of the water inlet branch 3 can be conveniently calculated after the actual measurement value of the valve flow is obtained.
S130: and calculating the actual pipeline resistance value of the water inlet branch 3 where each intelligent flow balance valve 8 is positioned by using the actually measured water inlet and return pressure difference value and the actually measured valve flow value according to the relation among the water inlet and return pressure difference, the valve flow and the pipeline resistance.
The calculation formula of the pipeline resistance is as follows:
Figure BDA0002297164640000111
wherein S is pipeline resistance, △ P is water inlet and return pressure difference, and V is valve flow.
The actual measurement of the pressure difference value of the inlet water and the return water is obtained through actual measurement, and after the valve flow value is actually measured, the actual pipeline resistance value of each inlet water and return water branch 5 where the intelligent flow balance valve 8 is located can be accurately and quickly calculated according to the relation among the pressure difference of the inlet water and the return water, the valve flow and the pipeline resistance, namely the calculation formula of the pipeline resistance.
S140: and calculating the target valve opening of each intelligent flow balance valve according to the relationship between the pipeline resistance and the valve opening by using the actual pipeline resistance value.
The valve opening degree and the valve flow of the intelligent flow balance valve are generally proportional functions, so the valve opening degree and the pipe of the intelligent flow balance valve 8The derivative of the square root of the path resistance is in a proportional relationship, specifically referring to the proportional formula of the valve opening:
Figure BDA0002297164640000112
wherein is the valve opening K of the intelligent flow balance valve 8 which determines the most unfavorable link1The valve opening ratio is set to 1, and the other branch lines can obtain the respective valve openings according to the valve opening ratio calculation formula.
S150: and adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening so as to stabilize the actual flow of the user end heat supply pipeline in the secondary heat supply network within the designed flow range.
As shown in fig. 2, because the pipeline resistance of the water inlet branch 3 is the pressure loss of the water inlet branch 3, the valve opening of the intelligent flow balance valve 8 is obtained through the pipeline resistance compensation, so that the flow of the water inlet branch 3 can be compensated, and even if the pressure loss exists in the secondary heat supply network, the actual heat supply flow and the design flow can also reach balance. And, because the static flow balance valve 9 is connected on the user side heat supply pipeline 4, the static flow balance valve 9 can play the effect of flow distribution in proportion in whole secondary heat supply network system, consequently when the flow of intelligent flow balance valve 8 reaches the design flow scope on water inlet branch 3, the static flow balance valve 9 can flow distribution in proportion for the flow of user side heat supply pipeline 4 keeps balanced, and then eliminates the hydraulic power unbalance condition.
According to the technical scheme provided by the embodiment of the invention, the actually measured pressure difference value of the inlet water and the actual water can be obtained by measuring the pressure difference of the inlet water and the return water of the inlet water branch 3 where each intelligent flow balance valve 8 is located; and measuring the valve flow of the water inlet branch 3 where each intelligent flow balance valve 8 is located to obtain an actual measured valve flow value, using the actual measured water inlet and return pressure difference value and the actual measured valve flow value, then according to the relation between the water inlet and return pressure difference, the valve flow and the pipeline resistance, obtaining the actual pipeline resistance value of the water inlet branch 3 where each intelligent flow balance valve 8 is located, obtaining the pressure loss existing in the water inlet branch 3 of the secondary heat network, according to the actual pipeline resistance, adjusting the actual valve opening of the intelligent flow balance valve 8 to the target valve opening, adjusting the flow of the water inlet branch 3 where the intelligent flow balance valve 8 is located, making the actual flow of the water inlet branch 3 reach the set flow value, and the static flow balance valve 9 communicated with each user side heat supply pipeline 4 is a self-operated regulating valve, and performing self-operated regulation against the system pressure difference and the self-operated spring 84, the flow is ensured to be stable at the designed flow and is not influenced by the pressure change of other pipelines, so that the hydraulic balance can be achieved as soon as possible. Compared with the technical scheme of adopting a heat supply mode of increasing the output of a water pump or adopting large flow and small temperature difference for heat supply mentioned in the background technology, the scheme can accurately adjust the actual flow of the water inlet branch 3 to reach a set flow value, and the indoor pipeline can reach hydraulic balance through self-operated adjustment of the static flow balance valve 9. Therefore, the problems that energy waste and low energy efficiency are caused by a heat supply mode provided by the prior art and the user experience effect is influenced are solved.
In addition, after the flow rate adjusting method shown in fig. 4, the hydraulic imbalance of the secondary heat supply network can be improved, and in the adjusting method shown in fig. 4, when the actual heat supply flow rate of the secondary heat supply network is balanced with the designed flow rate, the pressure loss can be compensated, so that the hydraulic imbalance of the secondary heat supply network can be improved. However, the secondary heat supply network has a large number of external disturbance factors, and these external disturbance factors directly affect the heat load of the secondary heat supply network, so that even if the actual heat supply flow of the secondary heat supply network reaches the set flow range, the secondary heat supply network still has a hydraulic imbalance condition.
In order to solve the above problem, the heating flow rate of the secondary heating network needs to be secondarily adjusted.
Specifically, as a preferred embodiment, as shown in fig. 5, in the flow rate adjustment method for improving hydraulic imbalance of the secondary heat supply network provided by the embodiment shown in fig. 5, in step S140 shown in fig. 4: the step of adjusting the actual valve opening of the intelligent flow balance valve 8 to the target valve opening further includes:
s210: measuring a change value of an external disturbance factor; the external disturbance factor is an external factor interfering with the heat load of the secondary heat supply network.
The external disturbance factors specifically include 8 disturbance factors which can cause interference on the secondary heat supply network, and the external factors should influence the heat load of the measured object. When the heat load is calculated, 8 influence factors of outdoor temperature, humidity, wind direction, ground temperature, total radiation, scattered radiation, sky effective temperature, wind power and the like are specifically selected as external disturbance factors. In addition, the 8 external disturbance factors are subjected to sensor detection, actual measurement values are obtained and quantitative analysis is carried out, and the influence of the 8 external disturbance factors on the heat load of the secondary heat supply network is accurately measured.
S220: and estimating the heat load deviation of the secondary heat supply network according to a heat load function between the external disturbance factor and the heat load by using the change value of the external disturbance factor.
The heat load function is obtained by adopting a computer to establish a mathematical model and is obtained by selecting 8 external disturbance factors in a longer time range to calculate big data of the influence of the external disturbance factors on the heat load of the secondary heat supply network. Through the heat load function between the external disturbance factor and the heat load, the actually measured change value of the external disturbance factor is used, and the heat load deviation of the secondary heat supply network can be accurately estimated.
S230: judging whether the heat load deviation of the secondary heat supply network is within a preset heat load deviation range; if yes, go to step S240; if not, go to step S250.
And judging whether the heat load deviation of the secondary heat supply network is in a preset heat load deviation range, namely predicting whether the heat load is in the heat load range in the normal heating period.
S240: and adjusting the heat exchange parameters of the heat exchanger according to the relationship between the heat load of the secondary heat supply network and the heat exchange parameters of the heat exchanger so as to eliminate the heat load deviation.
The heat exchanger 1 is used for exchanging heat between a primary heat supply network and a secondary heat supply network, adjusting the temperature of a thermal mass in a main water inlet pipeline 2 in the secondary heat supply network, and further adjusting the temperature of a heat supply pipeline 4 of a user side. In addition, the heat load deviation of the secondary heat supply network is in the preset heat load deviation range, which shows that the influence of external disturbance factors on the heat load is small, and at the moment, the heat supply temperature of the water inlet main pipeline 2 can be directly adjusted by adjusting the heat exchange parameters of the heat exchanger 1.
Wherein, the heat exchange parameters comprise the steam inlet flow of the heating steam, the water supply temperature and the like; specifically, the function of adjusting the heat load of the secondary heat supply network is achieved by changing the steam inlet flow rate of the heating steam of the heat exchanger 1 and/or changing the water supply temperature.
S250: and calculating a water pump flow adjustment value of the circulating water pump 7 according to the relationship between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump 7.
If the heat load deviation exceeds the preset heat load deviation range, a water pump flow adjustment value needs to be calculated, and the water pump flow is adjusted. Because the temperature of the supplied water is required to be kept not lower than the national standard requirement (generally 70 ℃) in the initial stage and the final stage of heating, the flow rate of the circulating water pump is required to be adjusted in a variable mode so that the temperature of the supplied water reaches the national standard requirement.
If the heat load deviation of the secondary heat supply network exceeds the preset heat load deviation range, the external disturbance factor is greatly changed, and the influence on the heat load is huge; at the moment, the heat load of the secondary heat supply network is difficult to reach the standard only by changing the heat exchange parameters of the heat exchanger 1. In order to solve the above problem, it is necessary to adjust the flow rate of the water pump 7 of the water inlet main line 2 communicating with the secondary heat supply network to perform variable flow rate adjustment. Specifically, a water pump flow adjustment value of the circulating water pump 7 is calculated according to a relationship between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump 7, wherein a functional relationship between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump 7 can be obtained through computer modeling. Because the heat load of the secondary heat supply network is obtained according to the actually measured change value of the external disturbance factor, the water pump flow adjustment value obtained by calculation in the step can also ensure accuracy.
S260: and adjusting the water pump flow of the circulating water pump by using the flow adjusting value so as to adjust the heat load deviation to be within a preset heat load deviation range.
The flow adjusting value is used for adjusting the water pump flow of the circulating water pump 7, the water pump flow of the circulating water pump 7 can be accurately adjusted to be within a proper flow range, and then the flow on each water inlet branch 3 and the flow of the user side heat supply pipeline 4 reach a proper range, the heat load loss of a secondary heat supply network caused by external disturbance factors is reduced, and the user side is enabled to normally supply heat.
In the technical scheme that this application embodiment provided, through the change value of the external disturbance factor of actual measurement, thereby can accurately predict the heat load deviation of secondary heat supply network, and then according to the size of the heat load deviation of secondary heat supply network, adjust the heat load of secondary heat supply network with the mode of adjusting heat exchanger 1 parameter or adjusting circulating water pump 7's water pump flow, can reduce the loss that causes because of the heat load of external disturbance factor to secondary heat supply network, keep the normal heat supply of user side heat supply pipeline 4.
In addition, in the secondary heat supply network, the circulating water pump 7 is communicated with the water inlet main pipeline 2, so that the change of the water pump flow of the circulating water pump 7 directly causes the great change of the flow in the water inlet branch pipeline 3 and the flow in the user side heat supply pipeline 4, and thus the valve opening of the intelligent flow balance valve 8 needs to be readjusted to adjust the flow of each water inlet branch pipeline 3 and the flow of each user side heat supply pipeline 4.
Referring specifically to the flow rate adjustment method shown in fig. 6, after the step of adjusting the water pump flow rate of the circulation water pump, the flow rate adjustment method further includes:
s310: and calculating a first valve opening change value of each intelligent flow balance valve corresponding to the water pump flow adjustment value according to the functional relation between the water pump flow of the circulating water pump and the valve opening of the intelligent flow balance valve.
Through computer modeling, a functional relation model between the water pump flow of the circulating water pump 7 and the valve opening of the intelligent flow balance valve 8 can be obtained, and when the water pump flow of the circulating water pump 7 is adjusted, the first valve opening change value of each intelligent flow balance valve 8 can be calculated according to the functional relation model.
S320: and adjusting the valve opening of each intelligent flow balance valve by using the first valve opening change value.
Through this first valve aperture change value, adjust the valve aperture of every intelligent flow balance valve 8, can stabilize the flow of the branch road 3 that intakes of intelligent flow balance valve 8 place, and then keep the stability of heat supply flow among the user side heat supply pipeline 4, stabilize user indoor temperature.
In addition, the scheme for improving the hydraulic imbalance of the secondary heat supply network fundamentally needs to maintain the stability of the indoor temperature of the user side, and the stability of the indoor temperature of the user side needs to stabilize the flow of the heat supply pipeline 4 of the user side, namely, the valve opening of the static flow balance valve 9 in the user side needs to be adjusted.
Therefore, in order to maintain the indoor temperature of the user terminal, as a preferred embodiment, as shown in fig. 7, the flow rate adjustment method for improving hydraulic imbalance of the secondary heat supply network provided in the embodiment of fig. 7 further includes, before the step of adjusting the valve opening of each intelligent flow balance valve 8, the following steps:
s410: and measuring the indoor temperature of the user side in a preset time period to obtain a room temperature change value.
Specifically, a temperature sensor is arranged around the indoor user side heat supply pipeline 4, and a room temperature change value is measured by the temperature sensor.
S420: and calculating a second valve opening degree change value of each intelligent flow balance valve corresponding to the room temperature change value according to the functional relation between the user side indoor temperature and the valve opening degree of the intelligent flow balance valve by using the room temperature change value. The functional relationship may be obtained by computer modeling.
S430: and respectively adjusting the valve opening of each intelligent flow balance valve by using the second valve opening change value and the corresponding weight thereof, and the first valve opening change value and the corresponding weight thereof.
In addition, after the valve opening of the intelligent flow balance valve is adjusted, the flow of the water pump of the circulating water pump needs to be finely adjusted according to the system flow and the pressure, so that the flow of the secondary heat supply network is balanced again, and the hydraulic imbalance condition of the secondary heat supply network is improved.
In the technical scheme provided by the embodiment of the application, a second valve opening degree change value is obtained by measuring a room temperature change value in a preset time period and calculating according to a functional relation between the user side indoor temperature and the valve opening degree of the intelligent flow balance valve, and the valve opening degree of each intelligent flow balance valve is adjusted by combining the first valve opening degree change value, so that the flow of a user side heat supply pipeline can be micro-adjusted according to the change of the user side indoor temperature; in addition, when the indoor temperature of a user is influenced in the adjusting process of the water pump flow of the circulating water pump, the indoor temperature of the user can be accurately finely adjusted by adjusting the opening of the second valve of the intelligent flow balance valve, and the comfort level of each user is improved.
In addition, as a preferred embodiment, as shown in fig. 8, the flow rate adjustment method for improving hydraulic imbalance of the secondary heat supply network provided by fig. 8 includes: primary regulation and secondary regulation; wherein:
the primary adjustment comprises the following steps:
s501: and setting the total flow of the pipeline where the intelligent flow balance valve is positioned, and keeping each intelligent flow balance valve 8 fully opened.
S502: and measuring the pressure difference between the inlet water and the return water by using a pressure gauge.
S503: the flow rate was measured using an ultrasonic flow meter.
S504: according to equation 1:
Figure BDA0002297164640000163
and calculating the pipeline resistance of each water inlet branch, wherein S is the pipeline resistance, △ P is the water inlet and return pressure difference, and V is the valve flow.
According to the formula 1, the square root of the pipeline resistance and the valve flow are in an inverse proportion relation, and the proportional relation obtained after the resistance is squared is obtained to obtain the proportional relation of the valve flow; also, because the valve flow versus valve opening curve of a flow valve is generally a direct proportional function, the valve opening is proportional to the inverse of the square root of the line resistance.
S505: according to equation 2:
Figure BDA0002297164640000161
Figure BDA0002297164640000162
and calculating and adjusting the valve opening of each intelligent flow balance valve.
Specifically, the valve opening K of the intelligent flow balance valve in the worst link is set1Fully opened, the opening degree is set to 1, and then the valve opening degrees of other water inlet branch pipelinesThen the valve opening K can be calculated according to equation 21、K2、……Kn. According to the calculated valve opening, initial adjustment of the flow of the secondary heat supply network can be completed; when the flow of the water inlet branch is stable, the intelligent flow balance valve can be finely adjusted according to the measured actual flow; if the characteristics of the user house, the heat exchanger and other devices are kept unchanged, the method only needs to measure and adjust once.
Under the condition of ensuring the regulation characteristic of the intelligent flow balance valve, the intelligent flow balance valve with the valve weight degree within the range of 0.3-0.5 is preferably smaller to ensure that the resistance of the system is smaller. Through accurate calculation and regulation, the flow of the water inlet branch where each intelligent flow balance valve is located is balanced, and a terminal user can select a pipeline with a proper pipe diameter and without a valve, so that the resistance of the whole system is further reduced.
In addition, after the primary adjustment is performed on the secondary heat supply network, the secondary adjustment may also be performed on the secondary heat supply network as appropriate, and the specific method is shown in fig. 8, and includes the following steps:
s506: and measuring the change value of the external disturbance factor, and estimating the heat load deviation of the secondary heat supply network according to the external disturbance factor.
The external disturbance factor D includes 8 influencing factors: outdoor temperature, humidity, wind direction, ground temperature, total radiation, scattered radiation, sky effective temperature, wind power level. For the control object, the above 8 influencing factors are disturbance factors, which influence the thermal load of the control object. When the heat load prediction calculation is carried out, 8 external disturbance factors are selected, a mathematical model is established by a computer to obtain the heat load of a target building, and a heat load prediction function of a measured object can be obtained according to the calculation result, so that a corresponding device is adjusted to carry out corresponding flow regulation.
S507: judging whether the heat load deviation of the secondary heat supply network is within a preset heat load deviation range; if yes, go to step S508 for quality adjustment; if not, step S509 is executed to perform variable flow rate adjustment.
If the thermal load deviation is within the preset thermal load deviation range, the change of the external disturbance factors is small, and the heat exchanger can be controlled to perform quality adjustment; when the heat load deviation exceeds the preset heat load deviation range, the change of external disturbance factors is large, the secondary heat supply network is greatly interfered, at the moment, the variable flow rate is adjusted, and the heat load of the secondary heat supply network is adjusted as soon as possible.
S508: and (3) carrying out quality adjustment: the heating steam inflow rate of the heat exchanger is changed, and the water supply temperature is adjusted to adjust the heat load of the secondary heat supply network.
When the external disturbance factors are not changed greatly and the predicted deviation of the heat load is small, the adjustment is carried out by changing the heating steam inflow rate of the heat exchanger and/or changing the water supply temperature. Under this mode of regulation, the secondary heating network need not to carry out extra regulation, and hydraulic power unbalance can not appear in the secondary heating network.
S509: and (3) variable flow regulation: the heat load of the secondary heat supply network is adjusted by changing the water pump flow of the circulating water pump.
When the external condition changes greatly and the predicted heat load deviation is large, the water pump flow of the circulating water pump is adjusted by changing the water pump flow of the circulating water pump, and the system fluctuation is large in the adjusting mode, so that the hydraulic imbalance of the secondary heat supply network is easily caused, and therefore corresponding secondary adjustment is needed.
The control system for variable flow regulation is shown in fig. 9, and the specific working principle is as follows
And (3) performing predictive calculation on the heat load, selecting 8 influence factors of outdoor temperature, humidity, wind direction, ground temperature, total radiation, scattered radiation, sky effective temperature, wind power and the like as external disturbance factors D, obtaining the heat load of the target building by adopting computer modeling, and then obtaining a heat load prediction function according to a calculation result so as to set the heat load into the controller for corresponding quality regulation.
The first regulator 14: according to the predicted heat load function F1(x), the input parameter is an external disturbance factor D, and the external disturbance factor D specifically comprises an external disturbance factor set value D0And a variation value △ D, the target of adjustment is the water pump flow Q of the circulating water pump 7, and the first flow first adjuster 14 calculates the target value Q of the water pump flow0(ii) a Then the water pump is controlled to the circulating water pumpThe circulator 17 inputs a flow rate variation value △ Q, and controls the circulating water pump actuator 17 to adjust the actual flow rate Q of the circulating water pump 7.
The second regulator 15: and calculating the valve opening corresponding to the changed external environment according to the functional relation F2(x) between the water pump flow Q and the valve opening, and sending an adjusting instruction to an intelligent valve executing mechanism of the intelligent flow balance valve 8. The input is the water pump flow Q of the circulating water pump 7, and the output is the opening degree of the valve core 1 controlled by the circulating water pump actuator 17.
The third regulator 16: PID control is carried out by using a proportional-integral-derivative controller, the room temperature is subjected to feedback regulation, and the output is the opening degree of the valve core 1 controlled by the circulating water pump actuator 17. Specifically, install wireless temperature measurement sensor additional in indoor, real-time measurement indoor temperature.
The outputs of the second regulator 15 and the third regulator 16 are calculated by an adder 18 to obtain a final valve opening command.
When the external disturbance factor D is not changed greatly and the change value does not reach the threshold value, the user performs feedback adjustment on the room temperature through the third regulator 16, so as to ensure that the indoor temperature fluctuation is stabilized within the specified range.
When the external disturbance factor D has large change and the change value of the external disturbance factor D exceeds a threshold value, the initial value D0Obtaining data D after delta D correction; the target flow rate Q is then obtained by calculation by the first regulator 140And then the actual water pump flow of the circulating water pump 7 is changed by the circulating water pump actuator 17 until the actual measurement flow Q is equal to the target value Q0. When the flow Q changes, the valve opening of the intelligent flow balance valve 8 after changing is calculated by the second regulator 15, and the valve opening is superposed with the valve opening instruction of the third regulator 17 to send an adjusting instruction to the valve. Finally, the indoor temperature T of the user reaches a set value T0。
Based on the same concept of the above method embodiment, the embodiment of the present invention further provides a flow rate adjustment system for improving hydraulic imbalance of a secondary heat supply network, which is used for implementing the above method of the present invention.
With reference to fig. 2 and fig. 10, fig. 10 is a schematic structural diagram of a flow rate regulation system for improving hydraulic imbalance of a secondary heat supply network according to an embodiment of the present application. As shown in fig. 2 and 10, the flow rate regulation system is used in the secondary heat supply network shown in fig. 1, in which the secondary heat supply network in fig. 1 includes a plurality of water inlet branches 3, and a plurality of user side heat supply pipelines 4 respectively communicated with each water inlet branch 3;
the flow regulating system for improving hydraulic imbalance of the secondary heat supply network shown in fig. 10 comprises: a part provided in the secondary heating network, and a control terminal 100. As shown in fig. 2, the flow rate regulation system directly provided to the secondary heat supply network portion includes: the intelligent flow balance valves 8 are respectively communicated with each water inlet branch 3 and are used for adjusting the flow of the water inlet branch 3 where the intelligent flow balance valve 8 is located; the static flow balance valve 9 is respectively communicated with each user side heat supply pipeline 4 and is used for stabilizing the flow of the user side heat supply pipeline 4 where the static flow balance valve 9 is located; the first pressure sensor 10 is communicated with the main water inlet pipeline 2 and is used for measuring the water inlet pressure of the water inlet branch 3 where each intelligent flow balance valve 8 is located; the second pressure sensor 11 is communicated with the water outlet end of each intelligent flow balance valve 8 and is used for measuring the return water pressure of the water inlet branch 3 where each intelligent flow balance valve 8 is located; and the flowmeter 12 is communicated with the water inlet main pipeline 2 and is used for measuring the valve flow of the water inlet branch 3 where each intelligent flow balance valve 8 is positioned to obtain an actually measured valve flow value.
Referring also to fig. 10, the control terminal 100 is electrically connected to the smart flow balance valve 8, the static flow balance valve 9, the first pressure sensor 10, and the second pressure sensor 11, respectively.
The control terminal 100 includes: and the water inlet and return pressure difference calculation module 101 is used for calculating the water inlet and return pressure difference of the water inlet branch 3 where each intelligent flow balance valve 8 is located according to the water inlet pressure and the water return pressure to obtain an actual measurement water inlet and return pressure difference value.
And the pipeline resistance calculation module 102 is configured to calculate an actual pipeline resistance value of the water inlet branch 3 where each intelligent flow balance valve 8 is located according to a relationship between the water inlet and return pressure difference, the valve flow and the pipeline resistance by using the actually measured inlet and return water pressure difference value and the actually measured valve flow value.
And the valve opening calculation module 103 is configured to calculate a target valve opening of each intelligent flow balance valve 8 according to a relationship between the pipeline resistance and the valve opening by using the actual pipeline resistance value.
And the valve opening adjusting module 104 is used for adjusting the actual valve opening of the intelligent flow balance valve 8 to the target valve opening, so that the actual flow of the user end heat supply pipeline 4 in the secondary heat supply network is stabilized within the designed flow range.
According to the flow regulating system for improving the hydraulic imbalance of the secondary heat supply network, provided by the technical scheme of the invention, the water inlet and return pressure difference of the water inlet branch 3 where each intelligent flow balance valve 8 is located is measured through the first pressure sensor 10 and the second pressure sensor 11, so that the actually measured water inlet and return pressure difference value can be obtained; and the flow meter 12 communicated with the main water inlet pipeline 2 measures the valve flow of the water inlet branch 3 where each intelligent flow balance valve 8 is located to obtain a measured valve flow value, the measured water inlet and return pressure difference value and the measured valve flow value are used, then the control terminal 100 can obtain the actual pipeline resistance value of the water inlet branch 3 where each intelligent flow balance valve 8 is located according to the relation between the water inlet and return pressure difference, the valve flow and the pipeline resistance, namely the pressure loss existing in the water inlet branch 3 of the secondary heat network, the actual valve opening of the intelligent flow balance valve 8 is adjusted to the target valve opening according to the actual pipeline resistance, the flow of the water inlet branch 3 where the intelligent flow balance valve 8 is located can be adjusted, so that the actual flow of the water inlet branch 3 reaches the set heat supply flow value, and the static flow balance valve 9 communicated with the pipeline 4 of each user side is a self-operated regulating valve, the hydraulic balance system can self-regulate against the system pressure difference and the self spring 84, ensures that the flow is stable at the designed flow and is not influenced by the pressure change of other pipelines, thereby achieving the hydraulic balance as soon as possible. Compared with the technical scheme of adopting a heat supply mode of increasing the output of a water pump or adopting large flow and small temperature difference for heat supply mentioned in the background technology, the scheme can accurately adjust the actual flow of the water inlet branch 3 to reach a set flow value, and the indoor pipeline can reach hydraulic balance through self-operated adjustment of the static flow balance valve 9. Therefore, the problems that energy waste and low energy efficiency are caused by a heat supply mode provided by the prior art and the user experience effect is influenced are solved.
See also the flow regulation system shown in fig. 11. Referring to fig. 2, the secondary heat supply network in fig. 2 further includes a heat exchanger 1 and a main water inlet pipeline 2 communicated with the heat exchanger 1, and the main water inlet pipeline 2 is communicated with a plurality of water inlet branches 3. The flow regulating system of fig. 11 comprises, in addition to the various structural modules described in fig. 10:
and the external disturbance factor measuring sensor 200 is used for measuring a change value of an external disturbance factor, wherein the external disturbance factor is an external factor which interferes with the heat load of the secondary heat supply network. In addition, the control terminal 100 in fig. 11 further includes:
and the heat load deviation estimation module 105 is configured to estimate the heat load deviation of the secondary heat supply network according to a heat load function between the external disturbance factor and the heat load by using the change value of the external disturbance factor.
And a heat load deviation judging module 106, configured to judge whether a heat load deviation of the secondary heat supply network is within a predetermined heat load deviation range.
And the heat exchange parameter adjusting module 107 is configured to adjust the heat exchange parameters of the heat exchanger 1 according to the relationship between the heat load of the secondary heat supply network and the heat exchange parameters of the heat exchanger 1 when the heat load deviation judging module judges that the heat load deviation is within the preset heat load deviation range, so as to eliminate the heat load deviation.
In addition, referring to the flow rate regulation system shown in fig. 12, in combination with the structures shown in fig. 2, the secondary heat supply network in fig. 2 further includes a circulating water pump 7 communicated with the main water inlet pipeline 2; the control terminal 100 in fig. 12 includes, in addition to the respective modules shown in fig. 10:
and the water pump flow meter 12 calculating module 108 is used for calculating a water pump flow adjusting value of the circulating water pump 7 according to the relation between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump 7 when the heat load deviation judging module judges that the heat load deviation exceeds the preset heat load deviation range.
And the water pump flow regulating module 109 is used for regulating the water pump flow of the circulating water pump 7 by using the flow regulating value so as to regulate the heat load deviation to be within a preset heat load deviation range.
In addition, the valve opening calculation module 103 is further configured to calculate a first valve opening variation value of each intelligent flow balance valve 8 corresponding to the water pump flow adjustment value according to a functional relationship between the water pump flow of the circulating water pump 7 and the valve opening of the intelligent flow balance valve 8. And the valve opening adjusting module 104 is further configured to adjust the valve opening of each intelligent flow balance valve 8 by using the first valve opening variation value.
Wherein, referring to fig. 13, the flow rate adjusting system further includes: and the room temperature measuring sensor 13 is used for measuring the indoor temperature of the user terminal within a preset time period to obtain a room temperature change value.
The valve opening calculation module 103 is further configured to calculate, by using the room temperature variation value, a second valve opening variation value of each intelligent flow balance valve 8 corresponding to the room temperature variation value according to a functional relationship between the user-side indoor temperature and the valve opening of the intelligent flow balance valve 8.
The valve opening adjusting module 104 is further configured to adjust the valve opening of each intelligent flow balance valve 8 by using the second valve opening variation value and the corresponding weight thereof, and the first valve opening variation value and the corresponding weight thereof.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A flow regulation method for improving hydraulic imbalance of a secondary heat supply network is characterized in that the secondary heat supply network comprises a plurality of water inlet branches and user side heat supply pipelines, and each water inlet branch is communicated with a plurality of user side heat supply pipelines; each water inlet branch is communicated with an intelligent flow balance valve, and each user side heat supply pipeline is communicated with a static flow balance valve;
the flow regulating method comprises the following steps:
measuring the pressure difference of inlet water and return water of the water inlet branch where each intelligent flow balance valve is located to obtain an actually measured pressure difference value of the inlet water and the return water;
measuring the valve flow of the water inlet branch where each intelligent flow balance valve is located to obtain an actually measured valve flow value;
calculating the actual pipeline resistance value of the water inlet branch where each intelligent flow balance valve is located according to the relation among the water inlet and return pressure difference, the valve flow and the pipeline resistance by using the actually measured inlet and return water pressure difference value and the actually measured valve flow value;
calculating the target valve opening of each intelligent flow balance valve according to the relationship between the pipeline resistance and the valve opening by using the actual pipeline resistance value;
and adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening so as to enable the actual flow of the user end heat supply pipeline in the secondary heat supply network to be stable within a design flow range.
2. The flow regulating method according to claim 1, wherein the secondary heat supply network further comprises a heat exchanger and a main water inlet pipeline communicated with the heat exchanger, wherein the main water inlet pipeline is communicated with a plurality of water inlet branch pipelines;
after the step of adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening, the flow adjusting method further includes:
measuring a change value of an external disturbance factor, wherein the external disturbance factor is an external factor interfering with the heat load of the secondary heat supply network;
estimating the heat load deviation of the secondary heat supply network according to a heat load function between the external disturbance factor and the heat load by using the change value of the external disturbance factor;
judging whether the heat load deviation of the secondary heat supply network is within a preset heat load deviation range or not;
and if the heat load deviation is judged to be within the preset heat load deviation range, adjusting the heat exchange parameters of the heat exchanger according to the relationship between the heat load of the secondary heat supply network and the heat exchange parameters of the heat exchanger so as to eliminate the heat load deviation.
3. The flow regulating method according to claim 2, wherein the secondary heat supply network further comprises a circulating water pump communicated with the main water inlet pipeline;
after the step of determining whether the heat load deviation of the secondary heat supply network is within a predetermined heat load deviation range, the flow rate adjustment method further includes:
if the heat load deviation is judged to exceed the preset heat load deviation range, calculating a water pump flow adjusting value of the circulating water pump according to the relation between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump;
and adjusting the water pump flow of the circulating water pump by using the water pump flow adjusting value so as to adjust the heat load deviation to be within the preset heat load deviation range.
4. The flow rate adjustment method according to claim 3, characterized in that after the step of adjusting the water pump flow rate of the circulating water pump, the method further comprises:
calculating a first valve opening change value of each intelligent flow balance valve corresponding to the water pump flow adjustment value according to a functional relation between the water pump flow of the circulating water pump and the valve opening of the intelligent flow balance valve;
and adjusting the valve opening of each intelligent flow balance valve by using the first valve opening change value.
5. The flow regulating method of claim 4, wherein prior to the step of adjusting the valve opening of each intelligent flow balancing valve, the method further comprises:
measuring the indoor temperature of a user side in a preset time period to obtain a room temperature change value;
calculating a second valve opening degree change value of each intelligent flow balance valve corresponding to the room temperature change value according to a functional relation between the user side indoor temperature and the valve opening degree of the intelligent flow balance valve by using the room temperature change value;
and respectively adjusting the valve opening of each intelligent flow balance valve by using the second valve opening change value and the corresponding weight as well as the first valve opening change value and the corresponding weight.
6. A flow regulation system for improving hydraulic imbalance of a secondary heat supply network is characterized in that the secondary heat supply network comprises a plurality of water inlet branches and a plurality of user side heat supply pipelines which are respectively communicated with the water inlet branches;
the flow rate regulation system includes:
the intelligent flow balance valves are respectively communicated with each water inlet branch and are used for adjusting the flow of the water inlet branch where the intelligent flow balance valves are located; and the number of the first and second groups,
the static flow balance valve is respectively communicated with each user side heat supply pipeline and is used for stabilizing the flow of the user side heat supply pipeline where the static flow balance valve is located;
the first pressure sensor is communicated with the main water inlet pipeline and is used for measuring the water inlet pressure of the water inlet branch where each intelligent flow balance valve is located; and the number of the first and second groups,
the second pressure sensor is communicated with the water outlet end of the intelligent flow balance valve and is used for measuring the return water pressure of the water inlet branch where each intelligent flow balance valve is located;
the flowmeter is communicated with the main water inlet pipeline and is used for measuring the valve flow of the water inlet branch where each intelligent flow balance valve is located to obtain an actually measured valve flow value;
the control terminal is electrically connected with the intelligent flow balance valve, the static flow balance valve, the first pressure sensor and the second pressure sensor respectively; wherein the content of the first and second substances,
the control terminal comprises:
the water inlet and return pressure difference calculation module is used for calculating the water inlet and return pressure difference of the water inlet branch where each intelligent flow balance valve is located according to the water inlet pressure and the water return pressure to obtain an actually measured water inlet and return pressure difference value;
the pipeline resistance calculation module is used for calculating the actual pipeline resistance value of the water inlet branch where each intelligent flow balance valve is located according to the relation among the water inlet and return pressure difference value, the valve flow and the pipeline resistance by using the actually measured water inlet and return pressure difference value and the actually measured valve flow value;
the valve opening calculation module is used for calculating the target valve opening of each intelligent flow balance valve according to the relationship between the pipeline resistance and the valve opening by using the actual pipeline resistance value;
and the valve opening adjusting module is used for adjusting the actual valve opening of the intelligent flow balance valve to the target valve opening so as to enable the actual flow of a user end heat supply pipeline in the secondary heat supply network to be stable within a design flow range.
7. The flow regulating system according to claim 6, wherein the secondary heat supply network further comprises a heat exchanger and a main water inlet pipeline communicated with the heat exchanger, and the main water inlet pipeline is communicated with the plurality of water inlet branches;
the flow regulating system further comprises:
the external disturbance factor measuring sensor is used for measuring a change value of an external disturbance factor, and the external disturbance factor is an external factor which interferes with the heat load of the secondary heat supply network;
the control terminal further comprises:
the heat load deviation estimation module is used for estimating the heat load deviation of the secondary heat supply network according to a heat load function between the external disturbance factor and the heat load by using the change value of the external disturbance factor;
the heat load deviation judging module is used for judging whether the heat load deviation of the secondary heat supply network is within a preset heat load deviation range or not;
and the heat exchange parameter adjusting module is used for adjusting the heat exchange parameters of the heat exchanger according to the relationship between the heat load of the secondary heat supply network and the heat exchange parameters of the heat exchanger when the heat load deviation judging module judges that the heat load deviation is within a preset heat load deviation range so as to eliminate the heat load deviation.
8. The system of claim 7, wherein the secondary heating network further comprises a circulating water pump in communication with the main water inlet line;
the control terminal further comprises:
the water pump flow calculation module is used for calculating a water pump flow adjustment value of the circulating water pump according to the relation between the heat load of the secondary heat supply network and the water pump flow of the circulating water pump when the heat load deviation judgment module judges that the heat load deviation exceeds the preset heat load deviation range;
and the water pump flow regulating module is used for regulating the water pump flow of the circulating water pump by using the water pump flow regulating value so as to regulate the heat load deviation to be within the preset heat load deviation range.
9. Flow regulating system according to claim 8,
the valve opening calculation module is further configured to calculate a first valve opening variation value of each intelligent flow balance valve corresponding to the water pump flow adjustment value according to a functional relationship between the water pump flow of the circulating water pump and the valve opening of the intelligent flow balance valve;
the valve opening adjusting module is further used for adjusting the valve opening of each intelligent flow balance valve by using the first valve opening change value.
10. The flow regulating system of claim 9, further comprising: the room temperature measuring sensor is used for measuring the indoor temperature of the user side within a preset time period to obtain a room temperature change value;
the valve opening calculation module is further configured to calculate, by using the room temperature change value, a second valve opening change value of each intelligent flow balance valve corresponding to the room temperature change value according to a functional relationship between the user-side indoor temperature and the valve opening of the intelligent flow balance valve;
the valve opening adjusting module is further configured to adjust the valve opening of each intelligent flow balance valve respectively by using the second valve opening variation value and the corresponding weight, and the first valve opening variation value and the corresponding weight.
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