Heating network flow control system and method based on heating load demand

Abstract

The present invention discloses a heat network flow control system and method based on heating load demand, the system includes a central processing unit, multiple temperature setting units and multiple indoor temperature acquisition units electrically connected to the central processing unit, and a control unit arranged on each stage of heat exchange device in the heat network; the control unit includes a proximal flow control valve and a water pump arranged on the water supply pipeline of each stage of heat exchange device; the central processing unit is used to calculate the heat load of each user on the user side and the heat load of each stage of pipe network according to the received data, so as to determine and control the corresponding valve opening and water pump operation frequency. The present invention takes the indoor temperature of each user on the user side as input, calculates the heat load ratio of different users and different pipe network level groups in combination with the target temperature, and controls the valve opening of the flow control valve and the water pump operation frequency in each stage of pipe network through the load ratio, so as to meet the actual needs of users, realize dynamic regulation, and achieve the purpose of energy saving.

Description

Technical Field

[0001] The present invention relates to the field of new energy and energy-saving technology, and in particular to a heat network flow control system and method based on heating load demand. Background Art

[0002] At present, centralized heating or centralized heat source combined with regional heat exchange station to transmit heat energy to users has become the main heating method. As urban energy supply gradually becomes tight, building energy conservation has become one of the hot spots in the development of heating technology. In building heating, the indoor temperature largely determines the amount of heat required by the building and the energy consumption. Due to the different heat requirements of users, while ensuring user comfort, it is also necessary to ensure reasonable heat distribution among the residents in the building, so as to achieve the purpose of energy saving.

[0003] However, in the current heating system, most district heating equipment and transducer equipment do not have the ability to control flow. Usually, the staff manually adjusts the frequency of the inverter based on experience. However, this manual adjustment method cannot ensure the reasonable distribution of heating among users, cannot match the actual needs of users, and cannot guarantee the timeliness of adjustments. Summary of the invention

[0004] In order to solve the deficiencies of the above-mentioned prior art, the present invention provides a heat network flow control system and method based on heating load demand, which calculates the load ratio with the indoor temperature of each user on the user side as input, and controls the valve opening of the flow control valve and the operating frequency of the water pump in the pipeline network at each level through the load ratio, so as to meet the actual needs of users, realize dynamic regulation and achieve the purpose of energy saving.

[0005] In a first aspect, the present application provides a heat network flow control system based on heating load demand.

[0006] A heat network flow control system based on heating load demand, comprising a central processor, a plurality of temperature setting units, a plurality of indoor temperature acquisition units and a control unit arranged on each stage of heat exchange device in the heat network;

[0007] The control unit includes a proximal flow control valve and a water pump arranged on the water supply pipeline of each stage of the heat exchange device, and the proximal flow control valve and the water pump are electrically connected to the central processor and are used to adjust the valve opening and the operating frequency of the water pump according to the control instructions issued by the central processor;

[0008] The multiple temperature setting units and the multiple indoor temperature collection units are arranged in multiple user buildings on the user side and are electrically connected to the central processor, and are used to transmit the target temperature set by the user and the collected real-time indoor temperature to the central processor;

[0009] The central processor is used to calculate the heat load of each user on the user side and the heat load of each level of the pipe network according to the received data, so as to determine the corresponding valve opening and water pump operation frequency.

[0010] According to a further technical solution, the central processing unit includes a data receiving module, a data processing module and a control module;

[0011] The data receiving module receives the target temperature and the real-time indoor temperature data, and transmits the received data to the data processing module;

[0012] The data processing module calculates the heat load of each user according to the target temperature and the indoor temperature, and determines the valve opening of the proximal flow control valve in the corresponding user pipe network according to the heat load of each user; calculates the heat load of each level of pipe network according to the heat load of each user, and determines the valve opening of the proximal flow control valve of the corresponding level of pipe network according to the heat load of each level of pipe network;

[0013] The control module controls the valve opening of the corresponding proximal flow control valve according to the determined valve opening.

[0014] According to a further technical solution, the valve opening is determined by:

[0015] The valve opening of the proximal flow control valve of the user network corresponding to the maximum heat load is set to 1, and the valve openings of other users in the network level group where the user is located are set according to the proportion of the heat load.

[0016] In a further technical solution, the central processor further includes a timing module; taking the time when the valve opening is regulated as the initial time, the timing module is used to count the time, and after a preset heating setting time, the data processing module determines whether to regulate the valve opening according to the detected real-time indoor temperature and the target temperature, including:

[0017] When the real-time indoor temperature is higher than the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is reduced at a set stage rate;

[0018] When the real-time indoor temperature fails to reach the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is increased at the set stage rate;

[0019] Adjust the valve opening until the temperature difference between the real-time indoor temperature and the target temperature does not exceed the preset value. At this time, the valve opening is controlled to be stable.

[0020] In a second aspect, the present application provides a method for controlling heat network flow based on heating load demand.

[0021] A heat network flow control method based on heating load demand, comprising:

[0022] Obtain the indoor temperature and set target temperature of each user in the heating network in real time;

[0023] Calculate the heat load of each user based on the target temperature and the indoor temperature, and determine the valve opening of the proximal flow control valve in the corresponding user pipe network based on the heat load of each user;

[0024] According to the heat load of each user, the heat load of each level of the pipeline network is calculated, and according to the heat load of each level of the pipeline network, the valve opening of the proximal flow control valve of the corresponding level of the pipeline network is determined;

[0025] According to the determined valve opening, the valve opening of the corresponding proximal flow control valve is regulated.

[0026] According to a further technical solution, the valve opening is determined by:

[0027] The valve opening of the proximal flow control valve of the user network corresponding to the maximum heat load is set to 1, and the valve openings of other users in the network level group where the user is located are set according to the proportion of the heat load.

[0028] A further technical solution is to take the time when the valve opening is regulated as the initial moment, and after a preset heating setting time, determine whether to regulate the valve opening according to the detected real-time indoor temperature and the target temperature, including:

[0029] When the real-time indoor temperature is higher than the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is reduced at a set stage rate;

[0030] When the real-time indoor temperature fails to reach the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is increased at the set stage rate;

[0031] Adjust the valve opening until the temperature difference between the real-time indoor temperature and the target temperature does not exceed the preset value. At this time, the valve opening is controlled to be stable.

[0032] A further technical solution is to determine a correction coefficient according to the supply and return water temperature difference in the pipeline network, and to correct the valve opening of the proximal flow control valve in the current pipeline network based on the correction coefficient.

[0033] One or more of the above technical solutions have the following beneficial effects:

[0034] 1. The present invention provides a heat network flow control system and method based on heating load demand. The indoor temperature of each user on the user side is used as input, and the heat load ratio of different users and different pipe network groups is calculated in combination with the target temperature. The flow control valve opening and water pump operating frequency in each level of the pipe network are controlled by the load ratio to meet the actual needs of users, realize dynamic regulation, and achieve the purpose of energy saving.

[0035] 2. The present invention corrects the valve opening by the supply and return water temperature difference, taking into account the influence of thermal loss along the way, making the heat distribution more uniform and being able to accurately match the terminal demand of heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0037] Figure 1 A schematic diagram of a heat network flow control system according to an embodiment of the present invention;

[0038] Figure 2 Schematic diagram of a heating system in an embodiment of the present invention.

[0039] Among them, 1. central processing unit, 2. temperature setting unit, 3. water supply temperature sensor, 4. return water temperature sensor, 5. proximal flow control valve, 6. distal flow control valve, 7. water pump, 8. heat exchange device, 9. indoor temperature acquisition unit. DETAILED DESCRIPTION

[0040] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Embodiment 1

[0043] This embodiment provides a heat network flow control system based on heating load demand, such as Figure 1 As shown, it includes a central processor 1, a plurality of temperature setting units 2, a plurality of indoor temperature acquisition units 9, and a control unit arranged on each stage of heat exchange device 8 in the heat network.

[0044] At present, the main heating method adopted by the heating network or heating system is that the heat energy provided by the centralized heating / centralized heat source / heating center is transmitted through the heating pipeline to the regional heat exchange station and then to the user side through the heating pipeline. The regional heat exchange station can actually be regarded as a large heat exchange device. The level of the heat network pipe network refers to the data of the heat exchange device from the heating center to the end user side. The heat exchange device on the user side is the last level of heat exchange device, which provides heat energy for the user, and multiple heating pipelines form a pipe network. For example, the first-level pipe network refers to the water supply and return pipe network from the heat source to the regional heat exchange station, and the second-level pipe network refers to the water supply and return pipe network from the regional heat exchange station to the user. Each level of the heat exchange device in the heat network is equipped with a water supply pipeline and a return pipe, which are connected to the heat exchange device of the previous level through the water supply pipeline and the return pipe to realize heat transfer.

[0045] The control unit includes a proximal flow control valve 5, a water pump 7 and a distal flow control valve 6 arranged on the water supply pipeline of each stage of the heat exchange device. The temperature setting unit 2 and the indoor temperature acquisition unit 9 are arranged in the user's building, and the temperature setting unit 2 and the indoor temperature acquisition unit 9 are electrically connected to the central processor 1, and are respectively used to transmit the user-set temperature and the collected real-time indoor temperature to the central processor; the proximal flow control valve 5, the water pump 7 and the distal flow control valve 6 are all electrically connected to the central processor 1, and the valve opening of the flow control valve and the operating frequency or operating power of the water pump are adjusted according to the control instructions issued by the central processor.

[0046] like Figure 2 As shown in the figure, the heat energy in the heating center passes through the primary heat exchange device and reaches the secondary heat exchange device on the user side. At this time, it is a two-stage heat exchange device. Each stage of the heat exchange device is equipped with a water supply pipeline and a return pipeline. The flow control valve on the water supply pipeline close to the user side is called the proximal flow control valve, and the flow control valve on the water supply pipeline far from the user side is called the distal flow control valve.

[0047] The proximal flow control valve is used as the main control valve for the water supply flow distribution control of the current level of the pipe network, and the distal flow control valve is used as the auxiliary control valve for the water supply flow distribution control of the previous level of the pipe network. In this embodiment, the distal flow control valve is set to assist the proximal flow control valve to achieve coarse and fine precise control of the water supply flow control.

[0048] In this embodiment, the central processor 1 adopts an STM32 single-chip microcomputer, which can run stably. The central processor includes a data receiving module, a data processing module and a control module; each user-side building is provided with a temperature setting unit and an indoor temperature acquisition unit, which are electrically connected to the data receiving module of the central processor, and the temperature setting unit faces the user. The user sets the target temperature required for indoor heating through the temperature setting unit, and then the temperature setting unit transmits the set target temperature to the central processor; the indoor temperature acquisition unit includes a temperature sensor arranged in the user-side room, which is used to measure the real-time temperature in the user-side room, and then the temperature sensor transmits the measured real-time temperature to the central processor. Further, since there are a large number of users on the user side, when transmitting data, the target temperature and real-time temperature data are marked with user serial numbers to avoid data confusion.

[0049] The data receiving module of the above-mentioned central processing unit receives the target temperature and real-time temperature data, and transmits the received data to the data processing module, which calculates the heat load of each user on the user side according to the target temperature and real-time temperature data, and determines the valve opening of the proximal flow control valve in the user network on the corresponding user side according to the heat load of each user on the user side; at the same time, based on the heat load size of each user on the user side, the heat load size of each level of the network is calculated, and the valve opening of the proximal flow control valve in the corresponding level of the network is determined according to the heat load size of each level of the network. The control module of the above-mentioned central processing unit controls the valve opening of the corresponding proximal flow control valve according to the valve opening determined by the data processing module, detects the real-time indoor temperature through the indoor temperature sensor, and when the set target temperature is reached, the central controller controls the valve opening to be stable.

[0050] Specifically, taking m groups of heating users as an example, the i-th group of heating users has n households. For the j-th user, according to the target temperature set by the user and the real-time actual indoor temperature, the heat load corresponding to the user side is calculated as:

[0051] ΔW(ij)=T 测 -T 目标

[0052] By the above method, the heat load data of each user in the group is calculated, and then the maximum heat load of the users in the group is determined. Based on the maximum heat load, the heat load data of the users in the group are normalized.

[0053] Afterwards, the valve opening of the proximal flow control valve on the heat exchange device corresponding to the user with the maximum heat load is set to 1, and then the valve openings of other users in the group are set according to the proportion of the heat load. At this time, the valve opening of the proximal flow control valve on each user side is determined.

[0054] Then, the total heat load of all users in group i is calculated as:

[0055] ΔW(i)=ΣΔW(ij)(1≤j≤n)

[0056] The maximum total heat load is determined in groups, and the total heat load of each group is normalized based on the maximum total heat load.

[0057] Secondly, the valve opening of the proximal flow control valve of the pipeline level group corresponding to the maximum total heat load is set to 1, and then the valve openings of other pipeline level groups at the same level are set according to the proportion of the total heat load. At this time, the valve opening of the proximal flow control valve of the pipeline level group at the current level is determined.

[0058] At this point, the total heat load data of all users can be obtained as:

[0059] ΔW=ΣΔW(i)(1≤i≤m)

[0060] Through the above method, the heat network flow control based on the heating load demand on the user side is realized to meet the actual needs of the user and achieve the purpose of energy saving.

[0061] Furthermore, in order to ensure the efficiency and effect of regulation, a timing module is also provided in the central processing unit. After the heating set time (i.e., the initial moment when the valve opening of the control valve is adjusted, and the preset heating set time has passed), when the real-time temperature monitored by the indoor temperature sensor is higher than the set target temperature, the valve opening of the user's proximal flow control valve is reduced at a stage rate of 5% / 30min; when the temperature monitored by the indoor temperature sensor does not reach the set target temperature, the valve opening of the user's proximal flow control valve is increased at a stage rate of 5% / 30min until the monitored real-time indoor temperature differs from the set target temperature by no more than 0.05°C.

[0062] As another embodiment, the central processor is also used to control the operating frequency of the water pump. Specifically, in the initial state, the water pump operates at the rated frequency. When the valve opening of each user's proximal flow control valve is less than 1, the operating frequency of the water pump is adjusted / controlled to decrease at a rate of 1% / 30min; when the actual temperature of a certain user cannot reach the set target temperature, the operating frequency of the water pump is adjusted / controlled to increase at a rate of 1% / 30min until the monitored actual indoor temperature reaches a stable state.

[0063] As another implementation, when a new user starts heating or a user stops heating, the heat load ratio is recalculated according to the increased or decreased heat load, that is, the above calculation process is repeated and the valve openings of the flow control valves at each level are readjusted.

[0064] Furthermore, compared with the total heat load data of all users calculated last time, when a new user starts heating or a user stops heating, when the increased heat load or reduced heat load reaches the set ratio, the operating frequency of the water pump is directly adjusted (increased or decreased) on the basis of re-adjusting the valve opening of each level of flow control valves, so as to increase or decrease the total heating flow and improve efficiency. Specifically, when a new user is added to a group, the valve opening of the group of users is readjusted according to the above steps, and then the valve opening of each pipe network group is adjusted step by step. When the calculated total heat load data ΔW of all users changes by more than 5%, the operating frequency of the water pump is adjusted in the same proportion.

[0065] As another implementation method, in order to balance the impact of thermal losses along the way, a water supply temperature sensor 3 and a return water temperature sensor 4 are respectively arranged on the water supply pipeline and the return pipeline of the heat exchange device to monitor the supply and return water temperatures, and transmit the collected supply and return water temperature data to the central processing unit. The central processing unit determines the correction coefficient based on the supply and return water temperature difference, and corrects the valve opening of the flow control valve based on the correction coefficient. Specifically, when the temperature difference is less than the set value, the valve opening of the set degree is increased; when the temperature difference is greater than the set value, the valve opening of the set degree is reduced.

[0066] Furthermore, based on the supply water temperature and return water temperature collected in real time by the supply water temperature sensor and the return water temperature sensor, the supply and return water temperature difference of the supply water temperature and the return water temperature is calculated, and the temperature difference is used as the denominator to correct the heat load data of this stage.

[0067] As another implementation, since the heat required by the user is also related to the area of ​​the user's building, for a certain user's building, the product of the temperature difference between the real-time temperature and the target temperature and the building area is used as a parameter to measure the heat load of the user. Specifically, the building area of ​​each user is pre-stored in the central processing unit, and after obtaining the indoor real-time temperature and the target temperature, the pre-stored building area is multiplied by the temperature difference to calculate the heat load of the user.

[0068] This embodiment uses the actual indoor temperature of the user side as input, and calculates the heat load ratio of different users and different pipe network groups in combination with the target temperature. The flow control valve and the water pump operating frequency are controlled by the heat load ratio to meet the actual needs of the user, realize dynamic regulation, and achieve the purpose of energy saving. In addition, the valve opening is corrected by the supply and return water temperature difference, taking into account the influence of thermal loss along the way, so that the heat distribution is more uniform and can accurately match the terminal demand of heating.

[0069] Embodiment 2

[0070] This embodiment provides a heating network flow control method based on heating load demand, including:

[0071] Obtain the indoor temperature and set target temperature of each user in the heating network in real time;

[0072] Calculate the heat load of each user based on the target temperature and the indoor temperature, and determine the valve opening of the proximal flow control valve in the corresponding user pipe network based on the heat load of each user;

[0073] According to the heat load of each user, the heat load of each level of the pipeline network is calculated, and according to the heat load of each level of the pipeline network, the valve opening of the proximal flow control valve of the corresponding level of the pipeline network is determined;

[0074] According to the determined valve opening, the valve opening of the corresponding proximal flow control valve is regulated.

[0075] Further, taking the time when the valve opening is regulated as the initial moment, after a preset heating setting time, judging whether to regulate the valve opening according to the detected real-time indoor temperature and the target temperature, including:

[0076] When the real-time indoor temperature is higher than the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is reduced at a set stage rate;

[0077] When the real-time indoor temperature fails to reach the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is increased at the set stage rate;

[0078] Adjust the valve opening until the temperature difference between the real-time indoor temperature and the target temperature does not exceed the preset value. At this time, the valve opening is controlled to be stable.

[0079] Furthermore, according to the valve opening, the operating frequency of the water pump in the corresponding user pipe network is controlled, including:

[0080] When the valve opening of the proximal flow control valve in each user's pipe network is less than 1, the operating frequency of the water pump is reduced by adjusting the set rate;

[0081] When the real-time indoor temperature of a certain user cannot reach the target temperature, the operating frequency of the water pump is increased at a set rate until the monitored real-time indoor temperature reaches a stable state.

[0082] Furthermore, a correction coefficient is determined according to the supply and return water temperature difference in the pipe network, and the valve opening of the proximal flow control valve in the current pipe network is corrected based on the correction coefficient.

[0083] The steps involved in the above embodiment 2 correspond to those in embodiment 1. For the specific implementation method, please refer to the relevant description part of embodiment 1.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0085] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A heat network flow control system based on heating load demand, characterized in that: It includes a central processing unit, a plurality of temperature setting units, a plurality of indoor temperature acquisition units, and a control unit arranged on each stage of heat exchange device in the heat network; The control unit includes a proximal flow control valve and a water pump arranged on the water supply pipeline of each stage of the heat exchange device, and the proximal flow control valve and the water pump are electrically connected to the central processor and are used to adjust the valve opening and the operating frequency of the water pump according to the control instructions issued by the central processor; The multiple temperature setting units and the multiple indoor temperature collection units are arranged in multiple user buildings on the user side and are electrically connected to the central processor, and are used to transmit the target temperature set by the user and the collected real-time indoor temperature to the central processor; The central processor is used to calculate the heat load of each user on the user side and the heat load of each level of the pipe network according to the received data, so as to determine the corresponding valve opening and water pump operation frequency; The central processor includes a data receiving module, a data processing module and a control module; the data receiving module receives the target temperature and the real-time indoor temperature data, and transmits the received data to the data processing module; the data processing module calculates the heat load of each user according to the target temperature and the indoor temperature, and determines the valve opening of the proximal flow control valve in the corresponding user pipe network according to the heat load of each user; calculates the heat load of each level of pipe network according to the heat load of each user, and determines the valve opening of the proximal flow control valve of the corresponding level of pipe network according to the heat load of each level of pipe network; the control module controls the valve opening of the corresponding proximal flow control valve according to the determined valve opening; A water supply temperature sensor and a return water temperature sensor are respectively arranged on the water supply pipe and the return water pipe of the heat exchange device, and the collected supply and return water temperature data are transmitted to the central processor, and the central processor calculates the supply and return water temperature difference between the supply water temperature and the return water temperature, and uses the temperature difference as the denominator to correct the heat load data of this stage; after obtaining the indoor real-time temperature and the target temperature, the heat load data of this stage is corrected according to the pre-stored building area; The valve opening is determined by: The valve opening of the proximal flow control valve of the user network corresponding to the maximum heat load is set to 1, and the valve opening of other users in the network level group where the user is located is set according to the proportion of the heat load; The central processor also includes a timing module; taking the time when the valve opening is regulated as the initial time, the timing module is used to count the time, and after the preset heating setting time, the data processing module determines whether to regulate the valve opening according to the detected real-time indoor temperature and the target temperature, including: When the real-time indoor temperature is higher than the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is reduced at a set stage rate; When the real-time indoor temperature fails to reach the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is increased at the set stage rate; Adjust the valve opening until the temperature difference between the real-time indoor temperature and the target temperature does not exceed the preset value, at which point the valve opening is controlled to be stable; The data processing module is also used to control the operating frequency of the water pump in the corresponding user pipe network according to the real-time indoor temperature and the target temperature, including: When the real-time indoor temperature of a certain user cannot reach the target temperature, the operating frequency of the water pump is increased at a set rate until the monitored real-time indoor temperature reaches a stable state; The data processing module is also used to control the operating frequency of the water pump in the corresponding user pipe network according to the valve opening, including: When the valve opening of the proximal flow control valve in each user's pipe network is less than 1, the operating frequency of the water pump is reduced by adjusting the set rate; When there are m groups of heating users, and the i-th group of heating users has n households, for the j-th user, according to the target temperature set by the user and the real-time actual indoor temperature, the heat load corresponding to the user side is calculated as: ΔW(ij)=T 测 -T 目标 By the above method, the heat load data of each user in the group is calculated, and then the maximum heat load of the users in the group is determined. Based on the maximum heat load, the heat load data of the users in the group are normalized; Afterwards, the valve opening of the proximal flow control valve on the heat exchange device corresponding to the user with the maximum heat load is set to 1, and then the valve openings of other users in the group are set according to the proportion of the heat load, and the valve opening of the proximal flow control valve on each user side is determined at this time; Then, the total heat load of all users in group i is calculated as: ΔW(i)=∑ΔW(ij) (1≤j≤n) The maximum total heat load is determined in groups, and the total heat load of each group is normalized based on the maximum total heat load; Secondly, the valve opening of the proximal flow control valve of the pipe network level group corresponding to the maximum total heat load is set to 1, and then the valve openings of other pipe network level groups at the same level are set according to the proportion of the total heat load. At this time, the valve opening of the proximal flow control valve of the pipe network level group at the current level is determined; At this point, the total heat load data of all users can be obtained as: ΔW=∑ΔW(i) (1≤i≤m) Through the above method, the heat network flow control based on the heating load demand on the user side is realized to meet the actual needs of the user and achieve the purpose of energy saving.

2. A method for controlling heat network flow based on heating load demand, using the heat network flow control system based on heating load demand according to claim 1, characterized in that: include: Obtain the indoor temperature and set target temperature of each user in the heating network in real time; Calculate the heat load of each user based on the target temperature and the indoor temperature, and determine the valve opening of the proximal flow control valve in the corresponding user pipe network based on the heat load of each user; According to the heat load of each user, the heat load of each level of the pipeline network is calculated, and according to the heat load of each level of the pipeline network, the valve opening of the proximal flow control valve of the corresponding level of the pipeline network is determined; According to the determined valve opening, regulating the valve opening of the corresponding proximal flow control valve; The supply and return water temperature difference between the supply and return water temperatures is calculated based on the supply and return water temperature data, and the temperature difference is used as the denominator to correct the heat load data of the stage; After obtaining the real-time indoor temperature and target temperature, the heat load data of this level is corrected according to the pre-stored building area.

3. The method for controlling the flow rate of a heating network based on heating load demand according to claim 2, characterized in that: The valve opening is determined by: The valve opening of the proximal flow control valve of the user network corresponding to the maximum heat load is set to 1, and the valve openings of other users in the network level group where the user is located are set according to the proportion of the heat load.

4. The method for controlling the flow rate of a heating network based on heating load demand according to claim 2, characterized in that: Taking the time when the valve opening is adjusted as the initial moment, after the preset heating setting time, it is determined whether to adjust the valve opening according to the detected real-time indoor temperature and the target temperature, including: When the real-time indoor temperature is higher than the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is reduced at a set stage rate; When the real-time indoor temperature fails to reach the target temperature, the valve opening of the proximal flow control valve in the corresponding user pipe network is increased at the set stage rate; Adjust the valve opening until the temperature difference between the real-time indoor temperature and the target temperature does not exceed the preset value. At this time, the valve opening is controlled to be stable.

5. The method for controlling the flow rate of a heating network based on heating load demand according to claim 2, characterized in that: A correction coefficient is determined according to the supply and return water temperature difference in the pipe network, and based on the correction coefficient, the valve opening of the proximal flow control valve in the current pipe network is corrected.

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