Heat supply system with step-by-step self-adaptive adjustment function

Abstract

The invention provides a step-by-step self-adaptive adjustment heat supply system. The step-by-step self-adaptive adjustment heat supply system comprises a plurality of terminal heat supply pipe networks, at least one second-stage heat supply pipe network, a first-stage heat supply pipe network and a heat supply source which are arranged step by step from bottom to top. Wherein a terminal control unit in the terminal heat supply pipe network adjusts the opening degree of a terminal valve according to a preset terminal control target; a second-stage control unit in the second-stage heat supply pipe network adjusts the heat supply water flow in the second-stage heat supply pipe network according to a preset second-stage control target; a first-stage control unit in the first-stage heat supply pipe network is used for adjusting the heat supply water flow in the first-stage heat supply pipe network; and a heating device in the heat supply source is used for heating heat supply water in the system under the control of the heating control unit. According to the heat supply system provided by the invention, each stage of heat supply pipe network performs heat supply water flow or water temperature adjustment in a self-adaptive manner according to the preset target, quick response can be made to changes of heat supply requirements, and efficient utilization of heat is realized on the basis of ensuring heat supply safety.

Description

Technical Field

[0001] This application belongs to the technical field of heating control. Specifically, a heating system with step-by-step adaptive adjustment is provided. Background Art

[0002] With the maturity of intelligent temperature control technology, heat metering technology, and the development of heating automation control, the heating method of household independent heating, heating on demand, and independent billing meets the needs of energy conservation and emission reduction as well as intelligent heating, and can meet the refined heating needs of users. Currently, it has become the main development trend of modern heating systems.

[0003] In order to simultaneously meet the actual heating needs of each user in the heating system and quickly respond to the adjustment of the heating demand of users, and achieve refined heating management, there have currently emerged various technical solutions for refined adjustment of heating according to the personalized heating needs of each terminal user. For example, a multi-level heating pipe network system composed of a heating center system, a distributed heat exchange center, a terminal heating device indoors, and a monitoring and control center. The heating center system calculates and adjusts the total heat load of the system by obtaining the monitoring data of the monitoring and control center, so as to optimize and coordinate the entire regional heating system; another example is that the control center takes the indoor temperature of each user on the user side as the input, calculates or predicts the heat load ratio of different users and different pipe network levels in combination with the target temperature, and controls the valve opening of the flow control valve and the operation frequency of the water pump in each level of the pipe network through the load ratio, so as to meet the actual needs of users, achieve dynamic regulation, and achieve the purpose of energy conservation.

[0004] The above heating system control methods have the following problems in practical applications: 1) When the central control system adjusts the heating according to the terminal heating load, it determines the heat output to the main pipe, each branch pipe, and each end heating user by calculating the heat load requirements at each level. This top-down adjustment method from the main pipe to the branch pipe to the end heating user will cause the problem of too slow adjustment process due to the limitation of the heat mass flow velocity; 2) This way of gradually distributing the total heating load downward cannot take into account the influence between the pipe networks or users at the same level, and is prone to cause chain reactions, resulting in the alternating appearance of insufficient heating and heat waste; 3) It is difficult to obtain the parameters for calculating or predicting the terminal heating load, and there is a significant difference between the predicted value and the actual heat load, making the terminal adjustment based on the load demand lack operability; 4) For the end heating user, the valve opening when the room temperature reaches the set temperature may vary within a large range. If the valve openings of a large number of end heating users are not within the ideal opening range, it may lead to waste of the heat transfer heat in the upper-level pipe network, or a too high risk of insufficient heat in the upper-level pipe network.

[0005] It can be seen that the above-mentioned existing regulation technologies for heating systems have poor practical operability and implementability, and may cause various problems such as heat fluctuations, waste or insufficiency in the pipe network. Summary of the Invention

[0006] This application provides a heating system with step-by-step adaptive regulation through embodiments. The heating system includes:

[0007] A plurality of terminal heating pipe networks, including terminal supply and return water pipelines, terminal heating devices, terminal valves, and terminal control units. The terminal valves are arranged on the terminal supply and return water pipelines, and the terminal control units are configured to adaptively adjust the opening degrees of the terminal valves according to preset terminal control targets;

[0008] At least one secondary heating pipe network, including secondary supply and return water pipelines and a secondary control unit. The secondary supply and return water pipelines are connected to each terminal heating pipe network at its lower level in parallel, and the secondary control unit is configured to adjust the heating water flow rate in the secondary heating pipe network according to a preset secondary control target;

[0009] At least one primary heating pipe network, including primary supply and return water pipelines and a primary control unit. The primary supply and return water pipelines are connected to each secondary heating pipe network at its lower level in parallel, and the primary control unit is used to adjust the heating water flow rate in the primary heating pipe network;

[0010] At least one heat source, including a heating device and a heating control unit. The heating device is used to heat the heating water in the primary heating pipe network at its lower level, and the heating control unit is used to adjust the temperature of the heating water heated by the heating device.

[0011] Further, the terminal control unit includes: a room temperature setting module for determining the room temperature setting value of the terminal heating pipe network; a room temperature measurement module for measuring the room temperature measurement value of the terminal heating pipe network; a valve adjustment module for adjusting the opening degree of the terminal valve according to a preset terminal control target, where the preset terminal control target is: on the basis that the deviation between the room temperature measurement value and the room temperature setting value of the terminal heating pipe network is within an acceptable range, keep the opening degree of the terminal valve within the optimal opening degree range; a terminal communication module for communicating with the secondary heating pipe network at its upper level.

[0012] Preferably, the optimal opening degree range is determined by expanding on both sides of the optimal opening degree value of the terminal valve, where the optimal opening degree value of the terminal valve is greater than 50%.

[0013] Further, the information sent by the terminal communication module to the secondary heating pipe network at its upper level includes the opening degree information of the terminal valve, but does not include the room temperature measurement value or the room temperature setting value.

[0014] Further, the secondary control unit includes: a secondary communication module for communicating with each terminal heat supply pipe network at its lower level and for communicating with the primary heat supply pipe network at its upper level; a differential pressure measurement module for measuring the end differential pressure of the secondary heat supply pipe network where it is located; a statistics module for statistically analyzing the valve opening distribution characteristics of the secondary heat supply pipe network where it is located, where the valve opening distribution characteristics include the proportion of terminal valves with openings within the optimal opening range, the proportion of terminal valves with openings less than the optimal opening range, and the proportion of terminal valves with openings greater than the optimal opening range in the secondary heat supply pipe network; a secondary circulation pump disposed in the main pipeline of the secondary heat supply pipe network where it is located for maintaining the circulation of heating water in the secondary heat supply pipe network; and a secondary frequency modulation module configured to adjust the frequency of the secondary circulation pump according to a preset secondary control target, where the preset secondary control target is: based on the end differential pressure of the secondary heat supply pipe network being not less than a preset differential pressure threshold, making the proportion of terminal valves with openings within the optimal opening range in the secondary heat supply pipe network exceed a preset first proportion threshold.

[0015] Further, the primary control unit includes: a primary communication module for communicating with each secondary heat supply pipe network at its lower level and for communicating with the heat source at its upper level; a primary circulation pump disposed in the main pipeline of the primary heat supply pipe network where it is located for maintaining the circulation of heating water in the primary heat supply pipe network; and a primary frequency modulation module for adjusting the frequency of the primary circulation pump.

[0016] Further, the heating control unit includes: a general communication module for communicating with each primary heat supply pipe network at its lower level; and a water temperature control module configured to adjust the temperature of the heating water heated by the heating device according to a preset water temperature control target.

[0017] Further, the preset water temperature control target is: based on there being no heat deficit in each secondary heat supply pipe network at the lower level of the heat source, making the proportion of secondary heat supply pipe networks with heat surplus lower than a preset fourth proportion threshold.

[0018] Further, for any secondary heat supply pipe network, when its end differential pressure reaches the preset differential pressure threshold and the proportion of terminal valves with openings less than the optimal opening range in this secondary heat supply pipe network exceeds the preset second proportion threshold, this secondary heat supply pipe network has heat surplus; for any secondary heat supply pipe network, when the proportion of terminal valves with openings greater than the optimal opening range in this secondary heat supply pipe network exceeds the preset third proportion threshold, this secondary heat supply pipe network has a heat deficit.

[0019] Preferably, the primary heating network further comprises: a heat locking unit for measuring the actual heat consumption of each of the subordinate secondary heating networks, and performing heat locking on the secondary heating networks whose actual heat consumption accounts for more than a preset heat proportion threshold.

[0020] Preferably, the first-level control unit is configured to adjust the heating water flow rate in the first-level heating network according to a preset first-level control target, and the first-level control target is specifically: on the basis that the actual heat consumption proportion of each second-level heating network below the first-level heating network does not exceed the heat proportion threshold, the proportion of terminal valves in the first-level heating network whose opening is within the optimal opening range exceeds a preset first proportion threshold.

[0021] The embodiments of the present application provide a step-by-step adaptively regulated heating system. To address the problems in the current large-scale heating network control technology that the adjustment process of the top-down step-by-step adjustment architecture is too slow and the terminal heat load demand cannot be accurately obtained, a bottom-up grading is adopted, and each level of the heating network adaptively adjusts different equipment based on different indicators, so as to finally achieve a match between the heat distribution in the entire system and its actual demand. Since the feedback adjustment of each level of the heating network is carried out within each level of the network, the control closed loop is short and the response speed is much higher than the long closed-loop feedback control method of step-by-step conduction from top to bottom. Therefore, it not only meets the heating needs of each terminal user, but also can respond quickly to the occurrence of heat surplus or heat shortage, so as to coordinately adjust the "quantity" and "quality" of heating water in a way that takes into account both safety and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the architecture of a terminal heating network provided according to an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the architecture of a secondary heating pipe network and its subordinate terminal heating pipe network provided according to an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the architecture of a primary heating pipe network and its subordinate heating pipe networks provided according to an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the overall architecture of a step-by-step adaptively regulated heating system according to an embodiment of the present application;

[0026] Figure 5 A schematic diagram of the architecture of a terminal control unit provided according to an embodiment of the present application;

[0027] Figure 6A A schematic diagram of a process for adjusting the opening of a terminal valve by a terminal control unit according to an embodiment of the present application;

[0028] Figure 6B It is a schematic diagram of the indoor heating situation of a specific heating household 5-1;

[0029] Figure 6C It is a schematic diagram of the indoor heating situation of a specific heating household 5-2;

[0030] Figure 6D It is a schematic diagram of the indoor heating situation of a specific heating household 5-3;

[0031] Figure 6E It is a schematic diagram of the indoor heating situation of a specific heating household 5-4;

[0032] Figure 7 It is a schematic diagram of the architecture of the secondary control unit provided according to the embodiments of the present application;

[0033] Figure 8A It is a schematic diagram of the opening distribution of each terminal valve in a specific secondary heating pipe network;

[0034] Figure 8B It is a schematic diagram of the opening distribution of each terminal valve in another specific secondary heating pipe network;

[0035] Figure 8C It is a schematic diagram of the opening distribution of each terminal valve in another specific secondary heating pipe network;

[0036] Figure 9 It is a schematic diagram of the process of the secondary control unit provided according to the embodiments of the present application for frequency adjustment of the secondary circulation pump;

[0037] Figure 10 It is a schematic diagram of the architecture of the primary control unit provided according to the embodiments of the present application;

[0038] Figure 11A It is a schematic diagram of the architecture of the step-by-step adaptive regulation heating system provided according to the embodiments of the present application;

[0039] Figure 11B It is a schematic diagram of the architecture of the step-by-step adaptive regulation heating system provided according to the embodiments of the present application;

[0040] Figure 12 It is a schematic diagram of the architecture of the heating control unit provided according to the embodiments of the present application;

[0041] Figure 13 It is a schematic diagram of the process of the heating control unit provided according to the embodiments of the present application for controlling the heating device;

[0042] Figure 14Schematic flow diagram of controlling a secondary heat supply pipe network by a secondary control unit and a heat locking unit provided according to an embodiment of the present application.

[0043] Reference numerals in the figure

[0044] Primary heat supply pipe network 1, primary water supply pipeline 11, inlet 111 of the primary water supply pipeline, outlet 112 of the primary water supply pipeline, primary return water pipeline 12, inlet 121 of the primary return water pipeline, outlet 122 of the primary return water pipeline, primary circulation pump 13, controller 14, primary communication module 141, primary frequency modulation module 142, heat meter 15, locking valve 16, secondary heat supply pipe network 2, secondary water supply pipeline 21, inlet 211 of the secondary water supply pipeline, outlet 212 of the secondary water supply pipeline, secondary return water pipeline 22, inlet 221 of the secondary return water pipeline, outlet 222 of the secondary return water pipeline, secondary circulation pump 23, controller 24, secondary communication module 241, statistics module 242, secondary frequency modulation module 243, differential pressure measurement module 25, terminal heat supply pipe network 3, terminal water supply pipeline 31, terminal return water pipeline 32, terminal heat supply device 33, terminal valve 34, terminal control unit 35, room temperature setting module 351, room temperature measurement module 352, valve adjustment module 353, terminal communication module 354, heat supply source 4, heat supply source water supply pipeline 41, heat supply source return water pipeline 42, heating device 43, heating control unit 44, total communication module 441, water temperature control module 442, circulation pump 45, heat supply users 5-1, 5-2, 5-3, 5-4, wall 61, window 62, insulation layer 63, heat exchange station 7. Detailed implementation manners

[0045] Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

[0046] In the description of the embodiments of the present application, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the products of the embodiments of the present application are usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, in the description of the present application, in order to distinguish different units, terms such as first and second are used in this specification, but these are not limited by the manufacturing order and should not be construed as indicating or implying relative importance. In the detailed description and claims of the present application, their names may be different.

[0047] The vocabulary in this specification is used to illustrate the embodiments of the present application, but is not intended to limit the present application. It should also be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a connection between the two elements. For those skilled in the art, the specific meanings of the above terms in this application can be specifically understood.

[0048] The present application provides a step-by-step adaptive heating system, which adopts a multi-level topology structure to construct a heating network. By implementing different heating control logics on heating networks at different levels, it adaptively performs precise heating control on each terminal heating household in the entire heating network, while achieving safe and energy-saving operation of the entire system.

[0049] The heating system includes a plurality of terminal heating pipe networks 3, at least one secondary heating pipe network 2, at least one primary heating pipe network 1 and at least one heating source 4 according to a bottom-up architecture. Figures 1 to 4 The heating system is displayed at different levels in the order of topology from bottom to top, among which: Figure 1 is a schematic diagram of the structure of a terminal heating pipe network 3 for providing heating to each heating household in some embodiments, Figure 2 It shows a schematic diagram of the structure of a secondary heating pipe network 2 and several terminal heating pipe networks 3 at the lower level in some embodiments; Figure 3 It shows a schematic diagram of the structure of a primary heating pipe network 1 and each heating pipe network at a lower level in some embodiments; Figure 4 The overall structure of the heating system in some embodiments is shown in FIG.

[0050] <Terminal heating network and its control method>

[0051] The terminal heating pipe network 3 is arranged indoors in each heating household to realize heating for the heating household. Figure 1 Each terminal heating network 3 is composed of a terminal water supply and return pipeline (including a terminal water supply pipeline 31 and a terminal return pipeline 32), a terminal heating device 33, a terminal valve 34 and a terminal control unit 35. Specifically, one end of the terminal water supply pipeline 31 is connected to the secondary water supply pipeline 21 described later, and the other end thereof enters the indoor room of the heating household and is connected to the water inlet of the terminal heating device 33; one end of the terminal return pipeline 32 is connected to the secondary return pipeline 22 described later, and the other end thereof enters the indoor room of the heating household and is connected to the water outlet of the terminal heating device 33.

[0052] The terminal heating device 33 can be a radiator or a floor heating device installed in the indoor of the heating household. Its water inlet receives the relatively hot heating water flowing in from the terminal water supply pipeline 31. During the flow of the heating water inside the terminal heating device 33, heat is continuously dissipated to the air in the indoor of the heating household to achieve heating for the heating household. Finally, the cooled heating water flows out through the water outlet of the terminal heating device 33 to the terminal water return pipeline 32.

[0053] The terminal valve 34 can adopt an electric control valve, including a valve body and an electric actuator. Among them, the electric actuator adjusts the valve opening according to the received adjustment instruction. In addition, the electric actuator is also equipped with a position feedback device to feedback the valve opening information to its control end. As Figure 1 shown, in some embodiments, the terminal valve 34 is arranged on the terminal water supply pipeline 31. By adjusting the opening of the terminal valve 34, the flow rate of the hot water flowing through the terminal heating device 33 can be adjusted, thereby realizing the adjustment of the indoor temperature of the heating household. In other embodiments, the terminal valve 34 can also be arranged on the terminal water return pipeline 32.

[0054] The adjustment of the opening of the terminal valve 34 is realized by the corresponding terminal control unit 35. In the embodiments of the present application, the terminal control unit 35 is configured to adaptively adjust the opening of its corresponding terminal valve 34 according to the preset terminal control target.

[0055] Figure 5 shows the schematic architecture diagram of the terminal control unit 35 in some embodiments. Refer to Figure 1 and Figure 5 , in some embodiments, the terminal control unit 35 includes a room temperature setting module 351, a room temperature measurement module 352, a valve adjustment module 353 and a terminal communication module 354.

[0056] Among them, the room temperature setting module 351 is used to determine the room temperature setting value of the terminal heating pipe network 3 (that is, the room temperature setting value of the heating household where the terminal heating pipe network 3 is located), and the room temperature measurement module is used to measure the room temperature measurement value of the terminal heating pipe network 3 (that is, the room temperature setting value of the heating household where the terminal heating pipe network 3 is located); the valve adjustment module 353 adjusts the opening of its corresponding terminal valve 34 based on the room temperature setting value and the room temperature measurement value of the terminal heating pipe network 3 according to the preset terminal control target.

[0057] In some specific embodiments, hardware commonly used in the art can be selected to construct the above-mentioned various functional modules. For example, the room temperature measurement module 352 can adopt one or more digital temperature sensors distributed indoors in the heating household to obtain the room temperature measurement value of the heating household in real time, and integrate functional modules such as the room temperature setting module 351, the valve adjustment module 353, and the terminal communication module 354 in a controller (such as a single-chip microcomputer, an industrial control computer, an embedded computer, a PLC, a DSP, etc.) for data interaction and control. Preferably, the room temperature setting module 351 can adopt forms such as buttons or touch screens to interactively adjust the set value of the room temperature.

[0058] The valve adjustment module 353 can obtain the above-mentioned room temperature set value and room temperature measurement value through a wired or wireless data interface, and according to the preset terminal control target, through control methods such as PID, send an adjustment instruction to the terminal valve 34 in real time, and at the same time perform feedback correction according to the deviation between the actual opening degree and the target opening degree of the terminal valve 34 fed back by the terminal valve 34, so as to realize the closed-loop control of the opening degree of the terminal valve 34.

[0059] After the opening degree information of the above-mentioned terminal valve 34 is fed back to the valve adjustment module 353, it is further sent to the corresponding terminal communication module 354, and is transmitted by the terminal communication module 354 to the upper-level secondary heating pipe network 2 based on a wired communication protocol or a wireless communication protocol.

[0060] The control logic of the terminal control unit 35 will be described in detail below with reference to the accompanying drawings.

[0061] In the embodiment of the present application, for any terminal heating pipe network 3 that supplies heat to a heating household, the corresponding terminal control unit 35 adjusts the opening degree of the terminal valve 34 based on the following terminal control target: on the basis that the deviation between the room temperature measurement value and the room temperature set value of the terminal heating pipe network 3 is within an acceptable range, keep the opening degree of the terminal valve 34 within the optimal opening degree range.

[0062] Figure 6A Illustrates the process S300 of the terminal control unit 35 adjusting the opening degree of the terminal valve 34 in a specific embodiment, as Figure 6A shown, at any moment t, the valve adjustment module 353 first obtains the room temperature set value T set (t) set by the user through the room temperature setting module 351, and the room temperature measurement value T real (t) measured in real time by the room temperature measurement module 352 in step S302, and then judges whether the deviation value between T real (t) and T set (t) is within the acceptable range δT in step S304.

[0063] The value of δT can be determined according to the accuracy of the room temperature measurement module 352 and the time step Δt of room temperature sampling and valve adjustment. Generally, the higher the accuracy of the temperature sensor, the smaller the value of δT can be set, for example, set to 0.5 °C or smaller, so that when achieving the terminal control target, the deviation between the room temperature measurement value and the room temperature set value is as small as possible.

[0064] Return to Figure 6A , when the judgment result of step S304 is no, it indicates that the room temperature does not meet the user's set value at this time, that is, the heating demand in the heating household's room has not been met, or the heating household's room has been overheated. After step S306 further judges which situation it is, the opening of the terminal valve 34 can be adjusted in the direction of increasing the valve opening u(t) or decreasing the valve opening u(t) through steps S308 and S310 respectively.

[0065] Generally, for any moment t, the valve opening u(t) of the terminal valve 34 can be expressed in the form of a percentage. Therefore, the operations of increasing the valve opening u(t) and decreasing the valve opening u(t) in steps S308 and S310 are to increase or decrease the percentage of u(t) respectively.

[0066] The amplitude of the increase or decrease of u(t) depends on various factors. For example, T real (t) and T set (t) is greater, the greater the amplitude of the valve opening adjustment can be set, and vice versa, the smaller the amplitude of the opening adjustment needs to be set; or, the response of the valve opening adjustment action of the terminal valve 34 to the room temperature measurement value at several moments before the current moment can be evaluated. If the change amplitude of the room temperature with the change of the opening of the terminal valve 34 is not obvious, the amplitude of the opening adjustment of the terminal valve 34 can be increased, and vice versa, the adjustment amplitude can be decreased.

[0067] After completing the valve opening adjustment operation of step S308 or S310, the current moment t can be updated according to a certain time step Δt and return to step S302 to re-obtain T set (t), T real (t), and then enter the judgment branch of step S304 again. The above adjustment method of adjusting the room temperature by adjusting the opening of the terminal valve 34 to make it reach the room temperature set value can be implemented using various PID control algorithms known to those skilled in the art. Obviously, the above adjustment process will be executed cyclically until the deviation between the room temperature measurement value and the room temperature set value of the heating household where the terminal heating pipe network 3 is located has entered an acceptable range.

[0068] After the room temperature of the heat supply user has reached the preset range, process S300 enters the control logic of the next stage. At this time, the control target for the terminal heat supply pipe network 3 will become to keep the valve opening of the terminal valve 34 within the optimal valve opening range.

[0069] Specifically, as Figure 6A shown, if in the judgment branch of step S304, the judgment result is yes, then further judge in step S312 whether the current valve opening u(t) is within the optimal opening range . If the judgment result is yes, then in step S314, keep the current valve opening u(t) unchanged, or only make fine adjustments to it so that it stably remains within . Then, update the current time t with a certain time step Δt and return to step S302 to re-obtain T set (t), T real (t), and then enter the judgment branch of step S304 again; if the judgment result is no, then in step S316, according to the direction in which the current valve opening u(t) deviates from , adjust the valve opening u(t) in the reverse direction to make the valve opening u(t) adjust towards the direction. Then, update the current time t with a certain time step Δt and return to step S302 to re-obtain T set (t), T real (t), and then enter the judgment branch of step S304 again.

[0070] In addition, as Figure 6A shown, before each update of the current time t and return to step S302, step S318 is also executed to obtain the valve opening u(t) fed back by the terminal valve 34 and send it to the upper-level secondary heat supply pipe network 2 through the terminal communication module 354 for use in the control process S200 of the secondary control target.

[0071] From the above specific process S300, it can be seen that in the embodiment of the present application, for the terminal valve 34 that adjusts the flow rate of the household heating water in the terminal heat supply pipe network 3, an adaptive adjustment of the valve opening is performed using two preset target drives, and the two targets have a difference in priority: first, the actual room temperature reaches or approaches the user-set value as the first target, and on the basis of adjusting the valve opening to ensure the achievement of the first target, further move the valve opening towards the optimal opening range .

[0072] Obviously, this mechanism for adjusting the terminal valve 34 is fundamentally different from various methods disclosed in the prior art that first establish a calculation model for the heat load demand of terminal heating users and then adjust the valve opening according to the difference between the measured heat input value and the heat load demand value (typically, such as the heating system flow control method disclosed in CN117029090A). The reason is that after a large amount of analysis of the actual operation of the heating pipe network on the user side, the applicant found that adjusting the valve opening based on the heat load demand of heating users does not have practical operability in the existing heating environment:

[0073] 1) First of all, the existing calculation models for the indoor heat load demand of heating users fundamentally cannot obtain accurate heat load demands because the actual heating status in the heating users' rooms contains uncertain parameters.

[0074] Take Figures 6B to 6E as an example for illustration. These four drawings respectively show the top views of four heating users 5-1, 5-2, 5-3, and 5-4 with the same house type (i.e., the same heating area). Among them, the wall 61 of heating user 5-1 has not been modified, the window 62 is in a closed state, and a set of terminal heating devices 33 are installed indoors; the states of the wall 61 and the window 62 of heating user 5-2 are the same as those of heating user 5-1, and the number of terminal heating devices 33 is increased to two groups; the states of the window and the terminal heating devices 33 of heating user 5-3 are the same as those of heating user 5-1, but a heat insulation layer 63 is added to its indoor wall 61 to improve the heat insulation effect.

[0075] Obviously, the indoor heating conditions of the above three heating users 5-1, 5-2, and 5-3 with exactly the same house type are completely different, and the factors causing the heating condition differences occur after the users' decoration and occupancy. These information cannot be obtained by the heating side fundamentally and cannot be reflected in the heat load demand model. Therefore, the same heating area will inevitably be calculated for the heat load demand of heating users in the way of "the heat required to raise the unit temperature per unit area × heating area × (room temperature setting value - room temperature measured value)". This will cause the terminal valve 34 to be set with the same opening, and the valve opening that meets the heating demand of heating user 5-1 will inevitably lead to overheating indoors for heating users 5-2 and 5-3.

[0076] Figure 6EAnother more complex situation is shown. In the figure, the state of the wall 61 of the heat supply household 5-4 and the terminal heat supply device 33 is the same as that of the heat supply household 5-1. However, its indoor window 62 is in an open state, resulting in a significant increase in the degree of heat exchange between the indoor and outdoor. Such factors of dynamic change are bound to cause the calculation of the existing heat load demand model to fail because there may be a situation where no matter how much the valve opening is increased, the indoor temperature does not rise. This will lead to an unreasonably excessive amplification of the heat load demand of this heat supply household during the calculation of the heat load demand.

[0077] 2) Secondly, the existing calculation model for the heat load demand of the heat supply terminal does not consider the matching degree between the system input heat and the actual demand heat reflected by the position of the valve opening.

[0078] Through Figures 6B to 6E analysis, it can be seen that for heat supply households with the same heating area, due to their different indoor heating conditions, when the corresponding terminal heating pipe network 3 meets their heating demands (that is, the difference between the temperature measurement value and the temperature setting is within an acceptable range), the valve opening may be in different states: when the valve opening is small, it means that when heating with the current water temperature, only a small flow rate is required to meet their heating demands. If a considerable number of heat supply households among the lower-level heat supply households of a secondary heating pipe network 2 achieve their heating demands with a small valve opening, it necessarily means that the heat input into the secondary heating pipe network 2 exceeds the actual demand; conversely, when the valve opening is large, even reaching 100%, it indicates that the heating demand of this heat supply household may not have been met yet, or is in a state of just being met but extremely unstable because at this time, the terminal heating pipe network corresponding to this heat supply household has reached its heating limit according to the current water temperature and is unable to cope with further increased heating demands (such as when the user further increases the temperature setting value, or as Figure 6E shown, the room temperature drops due to the intensified heat exchange between the indoor and outdoor). Obviously, if a considerable number of terminal valves 34 among the lower-level heat supply households of a secondary heating pipe network 2 are in this state of large opening, it means that the heat input into the secondary heating pipe network 2 cannot meet the heat demands of its lower-level heat supply households.

[0079] Thus, compared with various indoor demand heat load prediction models that have a large error between the predicted value and the reality due to the inability to consider the actual indoor heating state, the valve opening and its change state can more truly and sensitively reflect the matching degree between the input heat and the actual demand.

[0080] It should also be emphasized that when heating water flows in multiple terminal heating pipe networks 3 connected in parallel, adjusting the opening of the terminal valve 34 in the terminal heating pipe network 3 will not only affect the flow of heating water in its own pipeline, but will also have a linkage effect on the flow of heating water in other terminal heating pipe networks 3. For example, reducing the opening of a terminal valve 34 will reduce the flow of the terminal heating pipe network 3 where it is located. At the same time, due to the increase in flow resistance here, the heating water will tend to flow to other pipelines with larger openings, resulting in a corresponding increase in the flow of heating water in other terminal heating pipe networks 3 with larger openings. This increase will inevitably make the heating users who have met their heating needs tend to reduce the valve, and in turn weaken the effect of the previous heating user reducing the valve. It can be seen that the adjustment of each terminal valve 34 will dynamically affect each other, and the input heat and actual heat demand of each heating household will dynamically change between matching and mismatching. Therefore, even if the existing heat load prediction model can accurately obtain the actual heating demand of the heating household and adjust a terminal valve 34 based on the predicted value of the heat load prediction model, it will inevitably cause a linkage effect on other heating terminals, thereby resulting in the failure to achieve the expected effect.

[0081] To this end, in the embodiment provided in the present application, the estimated value of the heat demand predicted in advance is not used to control the adjustment degree of the terminal valve 34. Instead, the terminal valve 34 is driven to adjust with the first goal of meeting the room temperature setting value. When the first goal is reached, the terminal valve 34 may be in a state of low or high opening. At this time, the optimal opening range is used as the second goal, and the terminal valve 34 is driven to move to the range. The opening of the terminal valve 34 is in the optimal opening range. The terminal heating system 3 can make full use of the heat provided by it as much as possible without generating excessive heating demand for its upper secondary heating network 2. In this process, the heating water will dynamically adjust the flow in each terminal heating network 3 under the same secondary heating network 2, thereby realizing adaptive regulation at the terminal heating network level.

[0082] The optimal opening range can be obtained by setting the optimal opening value u of the terminal valve 34 best The two sides of the symmetric expansion are obtained. For example, in some specific embodiments, u best It is set to 60%, and with this value as the middle value, it is expanded symmetrically by 20 percentage points on both sides to obtain the lower limit of the optimal opening range. Upper limit That is, the optimal opening range is between 40% and 80%. It can be seen that the upper and lower limits of the optimal opening range are not symmetrically set relative to 50%, but are more biased towards the region with a larger opening. The reason is as analyzed above. If a considerable number of heat supply users among the heat supply users at the lower level of a secondary heat supply network 2 achieve their heat supply requirements with a relatively small valve opening, it necessarily means that the heat input into the secondary heat supply network 2 exceeds the actual demand. Therefore, the ideal valve opening range needs to ensure that the heat supply water entering the network is fully utilized (of course, it is also necessary to avoid an overly large opening, such as approaching 100%, which will result in the loss of the ability for further adjustment).

[0083] Considering that in a heat supply network, as the distance from the heat source increases, the hydraulic loss of the pipeline causes the pressure difference between the supply and return water in the pipeline to gradually decrease. Therefore, the higher the possibility of increasing the valve opening for the terminal heat supply network farther away from the inlet of the supply pipeline. For this reason, in some preferred embodiments, for each terminal heat supply network 3 at the same level, different optimal opening values u of its terminal valve 34 can be set according to its different distances from the inlet 211 of the upper-level secondary supply pipeline best : For example, for the terminal heat supply network 3 close to the inlet 211 of the secondary supply pipeline, the optimal opening value u of its terminal valve 34 best can be set to 55%. Correspondingly, the optimal opening range of its terminal valve 34 is 35% - 75%; for the terminal heat supply network 3 far away from the inlet 211 of the secondary supply pipeline, the optimal opening value u of its terminal valve 34 best can be set to 65%. Correspondingly, the optimal opening range of its terminal valve 34 is 45% - 85%. Setting different optimal opening ranges for the terminal valve 34 according to the distance from the heat source can more accurately characterize the heat supply state of the terminal heat supply network 3, which is beneficial to the accuracy of subsequent regulation of the secondary heat supply network 2

[0084] In some other preferred embodiments, by shortening the time step of sampling and adjustment and cooperating with fine-tuning of the proportional, integral, and differential parameters in the PID algorithm, on the premise that the deviation between the measured room temperature value and the set room temperature value is within an acceptable range, the valve opening of the terminal valve 34 can fluctuate within a smaller range (for example, fluctuate up and down by 5 percentage points around the optimal valve opening u best ), and finally obtain the optimal opening range), so as to more accurately regulate the heat input into the terminal heat supply network 3

[0085] In addition, without departing from the technical concept of the present application, those skilled in the art can also adjust the implementation manners of the above-mentioned various modules according to the specific environment in the heat supply user's room, such as selecting the number and layout method of temperature sensors, or selecting the button or touch adjustment method of the temperature setting module, etc

[0086] <Secondary heat supply pipe network and its control method>

[0087] Reference Figure 2 , in the embodiments of the present application, the terminal heat supply pipe network 3 corresponding to each heat supply household is at the lowest level of the entire heat supply pipe network. The heat supply pipe network at the upper level is called the secondary heat supply pipe network 2. In the embodiments of the present application, it can be planned according to the spatial positions of each heat supply household. For example, the terminal heat supply pipe networks 3 in each heat supply household in a residential building or several adjacent residential buildings are connected to the same secondary heat supply pipe network 2 in parallel. The secondary heat supply pipe network 2 provides heating water for the terminal heating devices 33 in each terminal heat supply pipe network 3 connected to its lower level and recovers the heating water flowing back from each terminal heating device 33.

[0088] Reference Figure 2 , Figure 3 and Figure 7 , in the embodiments of the present application, a secondary heat supply pipe network 2 is composed of a secondary supply and return water pipeline (including a secondary supply water pipeline 21 and a secondary return water pipeline 22) and a secondary control unit. Among them, the secondary supply water pipeline 21 and the secondary return water pipeline 22 are connected to the terminal supply water pipeline 31 and the terminal return water pipeline 32 of each terminal heat supply pipe network 3 at its lower level in parallel; the secondary control unit further includes a secondary circulation pump 23, a secondary communication module 241, a statistics module 242, a secondary frequency modulation module 243, and a differential pressure measurement module 25.

[0089] Specifically, the secondary supply water pipeline 21 has a plurality of outlets 212, which are respectively connected to the terminal supply water pipelines 31 of each terminal heat supply pipe network 3 at its lower level; the secondary return water pipeline 22 has the same number of a plurality of inlets 221, which are respectively connected to the terminal return water pipelines 32 of the same each terminal heat supply pipe network 3. Through this connection method, each terminal heat supply pipe network 3 at the lower level of a secondary heat supply pipe network 2 is connected to the secondary heat supply pipe network 2 in parallel.

[0090] In addition, as Figure 2 , Figure 3 shows, the secondary supply water pipeline 21 has an inlet 211, which is connected to the primary supply water pipeline 11 of the primary heat supply pipe network 1 at its upper level described later. The secondary return water pipeline 22 has an outlet 222, which is connected to the primary return water pipeline 12 of the primary heat supply pipe network 1 at its upper level described later.

[0091] The secondary circulation pump 23 is arranged in the main pipeline of the secondary heat supply pipe network 2 where it is located, and is used to maintain the circulating flow of heating water in the secondary heat supply pipe network 2. In some specific embodiments, as Figure 2As shown, the secondary circulating water pump 23 can be arranged at the inlet 211 of the secondary water supply pipeline. By adjusting the frequency of the secondary circulating water pump 23, the flow rate of the heating water in the corresponding secondary heating pipe network 2 can be adjusted, that is, the "quantity" of the heating water in the secondary heating pipe network 2 is adjusted. In addition, in some other embodiments, the secondary circulating water pump 23 can also be arranged at the outlet 222 of the secondary water return pipeline.

[0092] In the embodiments of the present application, the adjustment of the frequency of the secondary circulating water pump 23 is achieved through the cooperation of the pressure difference measurement module 25, the secondary communication module 241, the statistical module 242, and the secondary frequency modulation module 243 in the secondary control unit.

[0093] Among them, the pressure difference measurement module 25 is used to measure the end pressure difference of the secondary heating pipe network 2 where it is located. The end pressure difference (or the most unfavorable point pressure difference) refers to the pressure difference at the hydraulically most unfavorable position in the heating pipe network, usually referring to the supply and return water pressure difference at the farthest point from the heat source or heat inlet (or the point with the greatest hydraulic resistance) in the heating pipe network. In the embodiments of the present application, as Figure 2 shown, the pressure difference measurement module 25 can be arranged at the farthest end of the secondary supply and return water pipeline from the inlet 211 of the secondary water supply pipeline, or, according to the evaluation of the flow situation of the heating water in the secondary heating pipe network, the pressure difference measurement module 25 can be arranged at the position with the greatest hydraulic resistance. The pressure difference measurement module 25 can adopt various pressure difference measurement instruments known to those skilled in the art, such as a digital pressure difference meter (also known as a pressure gauge), and its measurement result can be transmitted to the secondary communication module 241 of the secondary control unit in a wired or wireless manner.

[0094] In addition to being communicatively connected to the pressure difference measurement module 25 to obtain the end pressure difference of the secondary heating pipe network 2 where it is located, the secondary communication module 241 is also communicatively connected to the terminal communication modules 354 in each terminal heating pipe network 3 at its lower level in a wired or wireless manner to obtain the opening information of the terminal valves 34 in each terminal heating pipe network 3 at its lower level, and send the valve opening information to the statistical module 242. Since in the technical solution of the present application, there is no central control unit at the top level that calculates the system heat load demand using the room temperature information of each terminal, in some preferred embodiments, each terminal communication module 354 only sends the opening information of its corresponding terminal valve 34 to the secondary heating pipe network at its upper level, and no longer sends the room temperature measurement value measured by each room temperature measurement module 352 or the room temperature setting value determined by the room temperature setting module 351.

[0095] Meanwhile, the secondary communication module 241 is also communicatively connected to the primary heat supply network 1 at its higher level, so as to send the end differential pressure of the secondary heat supply network 2 where it is located, as well as the result of the statistical module 242's statistics on the opening degrees of each terminal valve 34, to the primary heat supply network 1 at its higher level.

[0096] After the statistical module 242 obtains the opening degree information of each terminal valve 34 received by the secondary communication module 241, it statistically analyzes the opening degrees of the terminal valves 34 to obtain the valve opening degree statistical characteristics of the secondary heat supply network 2. Among them, for a secondary heat supply network 2, the valve opening degree distribution characteristics at least include the following three statistical values of the opening degrees of the terminal valves 34 at its lower level: the proportion of the terminal valves 34 with the opening degree within the optimal opening degree range, the proportion of the terminal valves 34 with the opening degree less than the optimal opening degree range, and the proportion of the terminal valves 34 with the opening degree greater than the optimal opening degree range.

[0097] Taking a specific secondary heat supply network 2 as an example, assume that there are N terminal heat supply networks in the secondary heat supply network 2 at time t. By measuring the supply and return water differential pressure at the very end of the secondary supply and return water pipelines, the end differential pressure ΔP min (t) of the secondary heat supply network 2 can be obtained. By statistically analyzing the opening degrees u1(t), u2(t),..., u i (t),...u N (t) of the terminal valves 34 in each terminal heat supply network 3, the valve opening degree statistical characteristics of the primary heat supply network 1 can be obtained:

[0098]

[0099] Among them, S1(t), S2(t), and S3(t) respectively represent the proportion of the terminal valves 34 with the opening degree within the optimal opening degree range, the proportion of the terminal valves 34 with the opening degree less than the optimal opening degree range, and the proportion of the terminal valves 34 with the opening degree greater than the optimal opening degree range, and count() is a counting function.

[0100] It should be noted that in the embodiments of the present application, the statistical analysis of the opening degree distribution characteristics of the terminal valves 34 in each terminal heating pipe network 3 is generally limited to only the terminal valves 34 in the activated state or normal working state, that is, the terminal heating pipe network 3 to which the terminal valve 34 to be statistically analyzed belongs is in the normal payment and heating state, and the terminal control unit 35 that controls the terminal valve 34 is in the normal startup state; for heating households that have not paid the fees or have stopped heating for other reasons, the terminal control unit 35 of the terminal heating pipe network 3 in their rooms has generally been remotely locked or actively shut down, and at the same time, the terminal valve 34 is generally in the fully closed state. At this time, the opening degree of the terminal valve 34 can be recognized as a special state such as Null in the system. When statistically analyzing the opening degree distribution characteristics of each terminal valve 34 under a secondary heating pipe network 2, the terminal valves 34 in the special states such as Null need to be excluded to avoid the statistical analysis of the pipelines that do not participate in the heating water circulation from affecting the analysis of the overall opening degree distribution state of each terminal valve 34 in the heating pipe network.

[0101] The secondary frequency modulation module 243 adjusts the secondary circulation pump 23 according to the end differential pressure measured by the differential pressure measurement module 25 and the valve opening degree distribution characteristics statistically obtained by the statistical module. In the embodiments of the present application, for any secondary heating pipe network 2, its corresponding secondary frequency modulation module 243 adjusts the frequency of its secondary circulation pump 23 based on the following secondary control objectives:

[0102] On the basis that the end differential pressure of the secondary heating pipe network 2 is not less than the preset differential pressure threshold, the proportion of the terminal valves 34 with the opening degree in the optimal opening degree interval in the corresponding secondary heating pipe network exceeds the preset first proportion threshold.

[0103] The physical meaning and specific implementation methods of the control objectives of the primary heating pipe network are described below with reference to the accompanying drawings.

[0104] Figures 8A to 8C Respectively show the distribution of the opening degrees of each terminal valve 34 under a secondary heating pipe network 2 at a certain moment t in some embodiments.

[0105] In Figure 8A the shown embodiment, the opening degree is in the optimal opening degree interval The proportion S1(t) of the number of terminal valves 34 in the total number of terminal valves 34 exceeds a preset first proportional threshold T1, that is, the opening degrees of most terminal valves 34 are within the optimal opening degree range. According to the analysis of the regulation process of the terminal heat supply network in the previous text, when the opening degree of a terminal valve 34 is within the optimal opening degree range, the terminal heat supply network 3 where it is located can utilize the heating water in the secondary heat supply network 2 where it is located most efficiently and safely. Correspondingly, when the proportion of terminal valves 34 with opening degrees within the optimal opening degree range among the various terminal valves 34 at the lower level of a secondary heat supply network 2 reaches a preset first proportional threshold T1, it can be considered that the heat carried by the heating water entering the secondary heat supply network 2 has been fully and safely utilized at this time. The heat input by the secondary heat supply network 2 at the current flow rate ("quantity") and water temperature ("quality") neither has a heat gap (that is, it causes the opening degrees of the various terminal valves 34 at its lower level to need to be further increased to meet the heating demand of the heat supply users), nor has obvious heat waste (that is, it causes the opening degrees of the various terminal valves 34 at its lower level to need to be reduced to avoid the room temperature of the heat supply users being significantly higher than the set value). It can be seen that it should be at the end differential pressure ΔP min not less than the set differential pressure threshold (in this application, the differential pressure threshold is represented by p T ), and on this basis, try to keep the secondary heat supply network 2 in this state.

[0106] It should be known that the lower the first proportional threshold T1, the easier it is to achieve the secondary control target. However, correspondingly, the proportion of terminal valves 34 with opening degrees not within the optimal opening degree range is also larger, that is, the secondary heat supply network 2 is more likely to be in a state where the total heat input does not match the sum of the actual heat demands of each terminal heat supply network; on the contrary, the higher the first proportional threshold T1, the longer it takes to adjust the heat input of the secondary heat supply network 2 so that the valve opening distribution characteristics of each terminal valve 34 reach the secondary control target. However, after the secondary control target is achieved, the matching state between the total heat input of the secondary heat supply network 2 and the sum of the actual heat demands of its lower-level terminal heat supply networks is less likely to be broken.

[0107] Based on the above analysis, the first proportional threshold T1 should be determined on the basis of comprehensively evaluating parameters such as the total number of terminal valves 34 in the secondary heat supply network 2 in the activated state, and the response speed of the room temperature change of each heat supply user relative to the opening degree adjustment amount of the terminal valve 34. In some specific embodiments, by comprehensively statistically analyzing data such as the response speed of the opening degree adjustment of the terminal valve 34 in the existing heat supply system to the room temperature, the preferred range of the first proportional threshold T1 is obtained as 60% - 80%.

[0108] At Figure 8BIn the illustrated embodiment, the proportion S1(t) of the number of terminal valves 34 with an opening degree within the optimal opening range in the total number of terminal valves 34 does not exceed a preset first proportional threshold T1, and the proportion S2(t) of the number of terminal valves 34 with an opening degree less than the optimal opening range in the total number of terminal valves 34 exceeds a preset second proportional threshold T2. When the valve opening distribution characteristic of the secondary heat supply network 2 is in this state, it indicates that a considerable number of terminal valves 34 have a relatively small opening degree at this moment, that is, only a relatively small heat supply water flow is required to make the room temperature of the heat supply households where they are located meet the heat supply demand. In this case, the total heat carried by the heat supply water entering the secondary heat supply network 2 will be wasted, resulting in insufficient air heat exchange between the heat supply water and the rooms where each terminal heat supply network 3 is located, and then flowing back through the secondary return water pipeline 22.

[0109] In the embodiment of the present application, when Figure 8B the phenomenon that the total input heat in the illustrated secondary heat supply network 2 does not match the sum of the actual heat demands of each terminal heat supply network 3 occurs, the secondary frequency modulation module 243 can reduce the frequency of the secondary circulation pump 23 of the secondary heat supply network 2 to reduce the flow rate of the heat supply water flowing into the secondary heat supply network 2, thereby reducing the total heat flowing into the secondary heat supply network 2 until the balance between the input total heat and the sum of the actual heat demands of each terminal heat supply network 3 is reached again.

[0110] Obviously, for a secondary heat supply network system 2, the frequency of its secondary circulation pump 23 cannot be reduced indefinitely, otherwise the flow condition of the heat supply water will inevitably deteriorate, resulting in insufficient water pressure in the terminal heat supply network and even dead zones. Therefore, when the secondary frequency modulation module 243 performs the above operation of reducing the frequency of the secondary circulation pump 13, it is necessary to ensure that the end differential pressure ΔP min (t) of the secondary heat supply network 2 is not less than the set differential pressure threshold p T . In some alternative embodiments, the differential pressure threshold p T can be 0.02 MPa, or 0.015 MPa.

[0111] If the continuous reduction of the frequency of the secondary circulation pump 23 results in the end differential pressure ΔP min (t) having been reduced to the trigger differential pressure threshold p T and still unable to make the opening distribution characteristic of each terminal valve 34 reach the ideal state, it means that the total input heat cannot be further reduced by adjusting the flow rate. In the embodiment of the present application, for a secondary heat supply network 2, when its end differential pressure ΔP min (t) is less than or equal to the preset differential pressure threshold p T , and the opening degree in this secondary heat supply network 2 is less than the optimal opening range When the proportion of the terminal valves 34 exceeds the preset second proportion threshold T2 (e.g., 50%), it is said that the secondary heat supply network 2 is in a state of heat surplus. From the above analysis, it can be seen that when a secondary heat supply network 2 has a heat surplus, it can no longer be solved by its own secondary control unit by adjusting the flow rate of the heating water, but needs to be solved by the method of adjusting the water temperature of the heating water described later.

[0112] Figure 8C The illustrated embodiment represents another state where the total heat input into the secondary heat supply network 2 does not match the sum of the actual heat demands of each terminal heat supply network 3. In this state, the proportion S1(t) of the number of terminal valves 34 with an opening degree in the optimal opening range in the total number of terminal valves 34 also does not exceed the preset first proportion threshold T1, and the proportion S3(t) of the number of terminal valves 34 with an opening degree greater than the optimal opening range in the total number of terminal valves 34 exceeds the preset third proportion threshold T3.

[0113] When a secondary heat supply network 2 is in Figure 8C the state shown, it means that at this moment, a considerable number of terminal valves 34 in the secondary heat supply network 2 have been in or close to the fully open state. As analyzed above, for the heating households corresponding to these fully open or nearly fully open terminal valves 34, the indoor room temperature either has not reached the room temperature setting value or barely reaches the room temperature setting value (because only when the room temperature measurement value continuously falls below the room temperature setting value, will the opening degree of the terminal valve 34 continuously increase until it exceeds the optimal opening range). This indicates that in the current heating water flow rate and water temperature state of the secondary heat supply network 2, the total heat input may no longer be able to meet the sum of the actual heat requirements of each terminal heat supply network 3. In the embodiment of the present application, for a secondary heat supply network 2, when the proportion of the terminal valves 34 with an opening degree greater than the optimal opening range exceeds the preset third proportion threshold (e.g., 50%), it is said that the secondary heat supply network 2 is in a state of heat deficit.

[0114] When there is Figure 8C the heat deficit shown in the secondary heat supply network 2, there are two ways to increase the total heat entering the secondary heat supply network 2: on the one hand, the frequency of the secondary circulation pump 23 can be increased to increase the total flow rate of the heating water flowing into the secondary heat supply network 2, so that when the opening degrees of each terminal valve 34 remain unchanged, the flow rate of the heating water flowing into the terminal heat supply network 3 is correspondingly increased, that is, the heat deficit is made up by increasing the "quantity"; on the other hand, the heat deficit can be made up by the method of adjusting the water temperature of the heating water described later, that is, by improving the "quality".

[0115] Figure 9Shows the specific process S200 in a specific embodiment in which the secondary frequency modulation module 243 adjusts the frequency of the secondary circulating water pump 23, as follows Figure 9 As shown, at any moment t, the secondary communication module 241 obtains the opening values u1(t) to u N (t) of each downstream terminal valve 34 and the end differential pressure ΔP min (t) of the secondary heat supply network 2 where it is located. Then, in step S204, first judge whether ΔP min (t) has been reduced to the differential pressure threshold p T . If the end differential pressure has reached p T , it indicates that continuing to reduce the frequency ω2(t) of the secondary circulating water pump 23 will cause the flow condition of the heating water in the secondary heat supply network 2 to deteriorate. At this time, the secondary frequency modulation module 243 will keep ω2(t) unchanged or increase ω2(t) slightly in step S206, and then return to step S202 after a period of time Δt to re-obtain ΔP min (t), u1(t) to u N (t).

[0116] If the judgment result of step S204 is negative, the statistical module 242 obtains the statistical values of S1(t) to S3(t) by statistically analyzing the openings of each terminal valve 34 in step S208. The above statistical values and ΔP min (t) are sent step by step to the upper-level primary heat supply network 1 and heat source 4 in step S210 for use by the heat source 4 during the water temperature adjustment in process S400.

[0117] Back to Figure 9 , the secondary frequency modulation module 243 judges in step S212 whether S1(t) is greater than or equal to T1. If so, it indicates that the openings of most terminal valves 34 are within the optimal opening range, and the heat input and demand of the secondary heat supply network 2 are relatively matched. The secondary frequency modulation module 243 will fine-tune ω2(t) according to the changes of S1(t) to S3(t) in step S214 to ensure that S1(t) is maintained at the current level or continues to increase.

[0118] If S1(t) < T1, step S216 further judges whether S2(t) is greater than or equal to T2. If so, it indicates that the openings of most terminal valves 34 are less than the optimal opening range, that is, the heat input of the secondary heat supply network 2 is greater than its demand. The secondary frequency modulation module 243 will reduce ω2(t) in step S118.

[0119] It should be noted that if the state of S2(t)>T2 lasts long enough, as ω2(t) decreases, ΔP min (t) will be reduced to trigger the differential pressure threshold pT , namely the ΔP described above min (t) reaches the preset pressure difference threshold p T , and the heat surplus state where S2 in the secondary heat supply network 2 exceeds T2. When the secondary heat supply network 2 enters this state, the problem of mismatch between the input heat and the required heat cannot be solved by adjusting the flow rate. The solution to this problem will be achieved through the operation of reducing the water temperature in the subsequent process S400.

[0120] If the judgment result of step S216 is no, then in step S220, it is further judged whether S3(t) is greater than or equal to T3, that is, whether there is a heat deficit in the secondary heat supply network 2. If the judgment result is yes, the secondary frequency modulation module 243 increases ω2(t) through step S222. At the same time, when a heat deficit occurs, the subsequent process S400 will also immediately perform the operation of raising the water temperature.

[0121] If the judgment result of step S220 is no, it means that the opening degrees of the terminal valves 34 in the secondary heat supply network 2 are relatively scattered. This situation is generally caused by the uneven flow of the heating water in the network (that is, the uneven distribution of heat). In step S224, the secondary frequency modulation module 243 can finely adjust ω2(t) according to the changes of S1(t) to S3(t) to utilize the linkage effect when adjusting the opening degrees of the terminal valves 34, so that the opening degree distribution characteristics adaptively move in the direction of S1(t) > T1.

[0122] Through Figure 9 It can be seen that the secondary heat supply module 243 adjusts the flow rate of the heating water in the secondary heat supply network 2, which also includes two layers of objectives. The first objective is to ensure that during the process of reducing the heat flowing into the secondary heat supply network 2 to increase the opening degrees of the terminal valves 34 by monitoring the end pressure difference, the phenomenon of too low flow rate leading to the deterioration of the flow state will not occur; the second objective is to make the opening degrees of the terminal valves 34 move in the direction that can make full use of the heat carried by the heating water on the premise of ensuring the minimum terminal supply and return water pressure difference.

[0123] In addition, the basis for flow regulation of the secondary heating network 2 comes from the comparison results of the statistical characteristics S1, S2, S3 of the opening of each valve and the corresponding proportional threshold value, rather than taking the sum of the heat load demands of each heating terminal as the basis for flow regulation as adopted in various heat load prediction models. The reason is that in addition to the existing heat load prediction model analyzed in the previous article that cannot accurately predict the heat load demand, it is also due to the following considerations: for a secondary heating network 2 including multiple terminal heating networks 3, there will often be several terminal heating networks 3 with too high valve openings and several terminal heating networks 3 with too low valve openings at the same time. This kind of heat mismatch between individual terminal heating networks 3 It does not necessarily mean that the total heat input by the superior secondary heating network 2 does not match the sum of the heat demands of all terminal heating networks 3. Instead, it may be caused by the imbalance of the flow state of heating water in various places. Since the flow state of heating water often changes adaptively in the process of adjusting the opening of each terminal valve 34, the above imbalance may be adaptively balanced by adjusting the opening of each terminal valve 34. Only when the opening distribution characteristics of all terminal valves 34 show a trend of overall movement in the direction of smaller opening or larger opening, can it be more accurately indicated that the secondary heating network 2 has a heat mismatch problem.

[0124] In some preferred embodiments, Figure 7 As shown, the secondary communication module 241, statistical module 242 and secondary frequency modulation module 243 can also be integrated into the controller 24 (such as a single-chip microcomputer, industrial computer, embedded computer, PLC, DSP, etc.) for data interaction and control.

[0125] <Primary heating network and its control method>

[0126] refer to Figure 3 , Figure 4 and Figure 10 In an embodiment of the present application, the heating network at the upper level of the secondary heating network 2 is the primary heating network 1. As shown in the figure, the primary heating network 1 is composed of a primary supply and return water pipeline (including a primary water supply pipeline 11 and a primary return water pipeline 12) and a primary control unit, wherein, similar to the secondary heating network 2 being connected in parallel to multiple terminal heating networks 3, the primary water supply pipeline 11 and the primary return water pipeline 12 of the primary heating network 1 are also connected in parallel with each of the secondary heating networks 2 at the lower level; the primary control unit further includes a primary communication module 141, a primary frequency modulation module 142 and a primary circulating water pump 13.

[0127] Specifically, the primary water supply pipeline 11 has multiple outlets 112, which are respectively connected to the secondary water supply pipelines 21 of each secondary heat supply network 2 at its lower level. The primary return water pipeline 12 has the same number of multiple inlets 121, which are respectively connected to the secondary return water pipelines 22 of the same respective secondary heat supply networks 2.

[0128] In addition, as Figure 3 , Figure 4 shown, the primary water supply pipeline 11 has an inlet 111, which is connected to the heat supply source water supply pipeline 41 of the heat source 4 at its upper level described later. The primary return water pipeline 12 has an outlet 122, which is connected to the heat supply source return water pipeline 42 of the heat source 4 at its upper level described later.

[0129] The primary circulation water pump 13 is arranged in the main pipeline of the primary heat supply network 1 where it is located, and is used to maintain the circulating flow of the heat supply water in the primary heat supply network 1. In some specific embodiments, as Figure 3 shown, the primary circulation water pump 13 can be arranged at the inlet 111 of the primary water supply pipeline. By adjusting the frequency of the primary circulation water pump 13, the flow rate of the heat supply water in the corresponding primary heat supply network 1 can be adjusted, that is, the "quantity" of the heat supply water in the primary heat supply network 1 is adjusted. In addition, in some other embodiments, the primary circulation water pump 13 can also be arranged at the outlet 122 of the primary return water pipeline.

[0130] The primary communication module 141 communicates with each secondary heat supply network 2 at its lower level to obtain the end differential pressure of the secondary heat supply network 2 at its lower level and the statistical characteristics of the valve opening degree. At the same time, by communicating with the heat source 4 at its upper level, the above information is sent to the heat source 4.

[0131] The primary frequency modulation module 142 adjusts the frequency of the primary circulation water pump 13 according to the end differential pressure and the valve opening degree distribution characteristics of each secondary heat supply network 2 at its lower level obtained from the primary communication module 141. Its adjustment method can refer to the frequency modulation method of the secondary frequency modulation module 241. It can be known that since the flow regulation of the secondary heat supply network 2 has limited the end differential pressure, that is, the minimum flow rate of each secondary heat supply network 2 has been limited, therefore, during the flow regulation process of the primary heat supply network 1, the supply and return water differential pressure can be not limited. Therefore, the main function of the primary frequency modulation module 142 is to further adjust the flow rate of the heat supply water flowing into the primary heat supply network 1 according to the opening degree distribution of the terminal valves 34 reflected by each secondary heat supply network 2 at its lower level, so that the total heat input into the primary heat supply network 1 approaches the sum of the actual heat demands of each secondary heat supply network 2 adaptively.

[0132] In some preferred embodiments, as Figure 10As shown, the above-mentioned primary communication module 141 and primary frequency modulation module 142 can also be integrated in the controller 14 (such as a single-chip microcomputer, industrial control computer, embedded computer, PLC, DSP, etc.) for data interaction and control.

[0133] <Heat source and its control method>

[0134] In Figure 3 、 Figure 4 In the embodiment shown, the heat source 4 includes a heat source water supply pipeline 41, a heat source water return pipeline 42, a heating device 43, and a heating control unit 44. Among them, the heat source water supply pipeline 41 and the heat source water return pipeline 42 are respectively connected to the primary water supply pipeline 11 and the primary water return pipeline 12 of the primary heating pipeline network 1 at its lower level. The heating water flowing back from the primary water return pipeline 12 enters the heat source through the heat source water return pipeline 42, and after being heated by the heating device 43, it flows into the primary water supply pipeline 11 from the heat source water supply pipeline 41, thereby realizing the heating water circulation of the entire system.

[0135] The heating device 43 can be implemented in a manner known to those skilled in the art. For example, a boiler can be used to directly heat the heating water, or a form of a boiler plus a heat exchanger can be adopted to isolate the water heated by the boiler from the heating water circulating in the pipeline network, or other forms such as an air source heat pump plus a heat exchanger can be used to heat the heating water.

[0136] The scale of the pipeline network that the heat source 4 can supply heat to can be determined according to the heating capacity of the heating device 43. In some embodiments, as Figure 3 、 Figure 4 shown, a heat source 4 can supply heating water to a primary heating pipeline network 1. In other embodiments, as Figure 11A shown, a heat source 4 can also supply heating water to multiple primary heating pipeline networks 1 at the same time. In order to ensure the good flow of the heating water in the pipeline network, a circulating water pump 45 can also be added between the heat source 4 and the primary heating pipeline network 1.

[0137] In addition, as Figure 11B shown, a heat exchange station 7 can be set between the primary heating pipeline network 1 and the heat source 4, and heat exchange is carried out in the heat exchange station 7 to heat the heating water in the primary heating pipeline network 1.

[0138] The heating process of the heating water by the heating device 43 is carried out under the control of the heating control unit 44, as Figure 12As shown, in some embodiments, the heating control unit 44 includes a general communication module 441 and a water temperature control module 442. Among them, the general communication module 441 is communicatively connected to the first-level communication modules 141 in each of the first-level heating pipe networks 1 under the heat supply source 4 where it is located, so as to obtain information such as the end differential pressure and valve opening distribution characteristics of each second-level heating pipe network 2 sent step by step. The water temperature control module 442 adjusts the temperature of the heating water heated by the heating device 43 based on the above information according to a preset water temperature control target.

[0139] In some preferred embodiments of the present application, the water temperature control target adopted by the water temperature control module 442 is: on the basis that there is no heat gap in each of the first-level heating pipe networks under the heat supply source, the proportion of the first-level heating pipe networks with heat surplus is lower than a preset fourth proportional threshold.

[0140] Figure 13 It shows the process S400 of the heating control unit 44 controlling the heating device 43 in some embodiments of the present application. Hereinafter, in conjunction with the drawings, the implementation manner and physical meaning of the above water temperature control target will be described. Among them, the heat supply source 4 where the heating control unit 44 is located has a total of M second-level heating pipe networks 2 under it.

[0141] As Figure 13 shown, at any moment t, the general communication unit obtains the end differential pressure of each second-level heating pipe network 2 under it through step S402 and the statistical result of the valve opening distribution characteristics Then in step S404, first judge whether there is a heat supply gap in the second-level heating pipe network 2, that is, whether there is at least one m∈[1,M] greater than T3. If the judgment result is yes, the water temperature control module 442 immediately controls the heating device 43 to increase the water temperature of the heating water through step S406. m∈[1,M], if the judgment result is yes, the water temperature control module 442 immediately controls the heating device 43 to increase the water temperature of the heating water through step S406.

[0142] If the judgment result of step S404 is no, then in step S408, further judge whether there is at least one second-level heating pipe network 2 with a heat gap, that is, whether there is m∈[1,M]. If the judgment result is no, it means that there is neither a second-level heating pipe network 2 with heat surplus nor a second-level heating pipe network 2 with a heat gap in the current entire heating system, and the heat provided by the heating water is efficiently and safely utilized in the entire heating system. Therefore, the water temperature control module 442 keeps the water temperature of the heating water unchanged in step S410. m∈[1,M], if the judgment result is no, it means that there is neither a second-level heating pipe network 2 with heat surplus nor a second-level heating pipe network 2 with a heat gap in the current entire heating system, and the heat provided by the heating water is efficiently and safely utilized in the entire heating system. Therefore, the water temperature control module 442 keeps the water temperature of the heating water unchanged in step S410.

[0143] If the judgment result in step S408 is yes, the water temperature control module 442 further judges the proportion S4(t) of the secondary heat supply pipe network 2 with heat surplus among all the secondary heat supply pipe networks 2 in step S412, and then judges whether S4(t) is greater than a preset fourth proportion threshold T4 (for example, T4 is 30%) in step S414. If the judgment result is yes, the water temperature control module 442 controls the heating device 43 to reduce the water temperature of the heat supply water in step S416; otherwise, it controls the heating device 43 to keep the water temperature of the heat supply water unchanged in step S418.

[0144] As Figure 13 shown, after the above steps of adjusting the water temperature of the heat supply water are completed, it is updated with a time step of Δt in the same way and returns to step S402.

[0145] Through Figure 13 the embodiments shown, it can be seen that there are also two levels of objectives in the adjustment of the water temperature in the entire heat supply system. Among them, as long as there is a heat deficit in any secondary heat supply pipe network 2, the water temperature of the entire heat supply water is immediately increased. The reason is that in the embodiments of the present application, the determination basis of the heat deficit is that a considerable number of terminal valves 34 in a secondary heat supply pipe network 2 are in a large opening interval. This situation generally occurs when the temperature drops in the whole area, and it is very likely that more secondary heat supply pipe networks 2 will have heat deficits in the near future. Therefore, the first level of the temperature adjustment objective is to immediately increase the water temperature when the heat deficit appears, so as to avoid the inability to timely compensate for more and more heat deficits due to the lag of the water temperature increase.

[0146] The handling of the heat surplus phenomenon belongs to the second level of the water temperature adjustment objective, and the heat supply water is not cooled immediately when the first secondary heat supply pipe network 2 has a heat surplus. This is because the secondary heat supply pipe network 2 with heat surplus must have met the heating needs of the vast majority of its corresponding heat supply users. Due to the existence of the primary heat supply pipe network 1, the heat surplus that appears in it may still be absorbed by other secondary heat supply pipe networks 2 at the same level, that is, through the primary heat supply pipe network 1 for adaptive heat balance operation. Therefore, the cooling adjustment can be started when the secondary heat supply pipe networks 2 as a whole show a heat surplus (for example, when S4(t) ≥ 30%, that is, more than 30% of the secondary heat supply pipe networks 2 have a heat surplus), so as to avoid the additional energy consumption caused by frequent changes in the water temperature.

[0147] <Secondary heat supply pipe network input total heat locking mechanism>

[0148] Refer to Figure 9 and Figure 13It can be seen that in the embodiments provided in the present application, when there is a heat gap in a certain secondary heating pipe network 2, the secondary control unit in the secondary heating pipe network 2 and the heating control unit 44 in the heat source 4 make up for the heat gap by increasing the flow rate and the water temperature respectively. However, since the heating rate of the heating water in the entire heating system by the heating device 43 is much slower than the increasing rate of the heating water flow rate in a certain secondary heating pipe network 2, the following situation may occur when making up for the heat gap in a certain secondary heating pipe network 2: Since the rising speed of the water temperature is slow, before the water temperature of the heating water rises significantly, the secondary control unit of the secondary heating pipe network 2 that has entered the heat gap state will drive the secondary circulation pump 23 to continuously increase the frequency, and increase the total heat flowing into the secondary heating pipe network 2 by continuously increasing the inflow of the heating water. This phenomenon that a certain one or several secondary heating pipe networks 2 rapidly increase the flow rate in a short time will surely break the balance between the total input heat and the actual heat demand of other secondary heating pipe networks 2 at the same level, and may cause a chain reaction in more secondary heating pipe networks 2, resulting in a rapid increase in the number of secondary heating pipe networks 2 with heat gaps. Although the increase in the number of heat gaps in the secondary heating pipe network 2 is due to the imbalance of heat distribution in the primary heating pipe network 1 in a short time, once the heating control unit 44 obtains the above statistical information, it will misjudge the total amount of heat gaps in the entire heating system, resulting in excessive elevation of the water temperature. Therefore, when there is a heating gap in an individual secondary heating pipe network 2 in the system, a preferred control mechanism is to monitor the total heat flowing into the secondary heating pipe network 2 with a heat gap while adjusting the water temperature of the heating water, so as to avoid excessive increase in the flow rate in a short time and exacerbate the heating imbalance in the primary heating pipe network 1 where it is located.

[0149] For the above reasons, in some preferred embodiments of the present application, the primary heating pipe network 1 further includes a heat locking unit for measuring the actual heat consumption of each secondary heating pipe network 2 at its lower level and locking the heat of the secondary heating pipe network 2 whose actual heat consumption ratio exceeds a preset heat ratio threshold.

[0150] As Figure 4 shown, in some embodiments, the heat locking unit includes a plurality of heat meters 15 and locking valves 16, which are respectively arranged in one-to-one correspondence with each secondary heating pipe network 2 at the lower level of the primary heating pipe network 1.

[0151] The heat meter 15 can use an ultrasonic heat meter known to those skilled in the art, and includes a flow meter and a water temperature measurement module, wherein the flow meter can be set at the outlet 112 of the primary water supply pipeline, or at the inlet 121 of the primary return pipeline, to obtain the heating water flow of the secondary heating pipeline network 2 at the lower level, and the water temperature measurement module simultaneously measures the water temperature of the heating water at the outlet 112 of the primary water supply pipeline and the inlet 121 of the primary return pipeline. Through the difference between the flow rate and the water temperature, the actual heat consumed by the secondary heating pipeline network 2 at each moment can be estimated. The locking valve 16 is set at the outlet 112 of the primary water supply pipeline, or at the inlet 121 of the primary return pipeline, and realizes data exchange with the primary control unit through its communication module. When the heat locking instruction is not received, its valve body is in a fully open state. After receiving the heat locking instruction, by adjusting its valve body opening, the heating water flow flowing into each secondary heating pipeline network 2 is limited to a preset flow value, thereby realizing the locking of the input heat.

[0152] See also Figure 14 When there is a heat locking unit, the primary control unit, while adjusting the primary circulating water pump 13, also adds a step of heat locking for the secondary heating pipe network 2 that occupies heat unreasonably.

[0153] Specifically, for a primary heating network 1 including M secondary heating networks 2, the historical data of actual heat consumption of each secondary heating network 2 can be counted, so as to obtain the actual heat consumption Q of each secondary heating network 2 when it is in a normal heating state. m (t) Proportion Q in the entire primary heating network 1 m (t) / sum[Q 1 (t),Q M (t)], and then determine a reasonable heat ratio threshold q for it m Then in the process S100, firstly, in step S102, the secondary heating pipe networks 2 of the lower level are obtained. The heat meter 15 is used to estimate the actual heat consumption Q of each secondary heating network 2 in real time. 1 (t)~Q M (t), then, in step S104, it is determined whether there is a heat gap in the secondary heating network 2. If the determination result is no, in step S212, The frequency ω1(t) of the primary circulation water pump 13 is adjusted in the increasing direction. Otherwise, in step S106, it is further determined whether there is a secondary heating network 2 whose actual heat consumption exceeds its heat consumption threshold. If the judgment result is yes, heat is locked in step S108. In addition, no matter what the judgment result is, ω1(t) is increased in step S110 to solve the heat gap problem.

[0154] The specific implementation manners of the present application have been described in detail above. For those skilled in the art of this technology, without departing from the principle of the present application, several improvements and modifications can still be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A step-by-step adaptive heating system, characterized in that: include: A plurality of terminal heating pipe networks, including a terminal water supply and return pipe, a terminal heating device, a terminal valve and a terminal control unit, wherein the terminal valve is arranged on the terminal water supply and return pipe, and the terminal control unit is configured to adjust the opening of the terminal valve according to a preset terminal control target; At least one secondary heating network, including a secondary water supply and return pipeline and a secondary control unit, wherein the secondary water supply and return pipeline is connected in parallel with each terminal heating network at a lower level, and the secondary control unit is configured to adjust the heating water flow in the secondary heating network according to a preset secondary control target; At least one primary heating network, including a primary water supply and return pipeline and a primary control unit, wherein the primary water supply and return pipeline is connected in parallel with each of the secondary heating networks at the lower level, and the primary control unit is used to adjust the flow rate of heating water in the primary heating network; At least one heat source includes a heating device and a heating control unit, wherein the heating device is used to heat the heating water in the lower-level primary heating network, and the heating control unit is used to adjust the temperature of the heating water heated by the heating device.

2. The step-by-step adaptive heating system according to claim 1 is characterized in that: The terminal control unit comprises: A room temperature setting module, used to determine the room temperature setting value of the terminal heating network; A room temperature measurement module, used to measure the room temperature measurement value of the terminal heating network; A valve regulating module, regulating the opening of the terminal valve according to a preset terminal control target, wherein the preset terminal control target is: on the basis that the deviation between the room temperature measurement value of the terminal heating network and the room temperature setting value is within an acceptable range, keeping the opening of the terminal valve within an optimal opening range; The terminal communication module is used to communicate with the upper-level secondary heating network.

3. The step-by-step adaptive heating system according to claim 2 is characterized in that: The optimal opening range is determined by expanding on both sides of the optimal opening value of the terminal valve, wherein the optimal opening value of the terminal valve is greater than 50%.

4. The step-by-step adaptive heating system according to claim 2 is characterized in that: The information sent by the terminal communication module to its upper secondary heating network includes the opening information of the terminal valve, but does not include the room temperature measurement value or the room temperature setting value.

5. The step-by-step adaptive heating system according to claim 1, characterized in that: The secondary control unit comprises: The secondary communication module is used to communicate with the terminal heating pipe networks at the lower level, and to communicate with the primary heating pipe network at the upper level; The pressure difference measurement module is used to measure the terminal pressure difference of the secondary heating pipe network in which it is located; A statistical module, used to count the valve opening distribution characteristics of the secondary heating network in which it is located, wherein the valve opening distribution characteristics include the proportion of terminal valves whose openings are within the optimal opening range, the proportion of terminal valves whose openings are less than the optimal opening range, and the proportion of terminal valves whose openings are greater than the optimal opening range in the secondary heating network; A secondary circulating water pump is arranged in the main pipe of the secondary heating pipe network where it is located, and is used to maintain the circulation flow of heating water in the secondary heating pipe network; The secondary frequency modulation module is configured to adjust the frequency of the secondary circulating water pump according to a preset secondary control target, wherein the preset secondary control target is: On the basis that the terminal pressure difference of the secondary heating network is not less than the preset pressure difference threshold, the proportion of terminal valves in the secondary heating network whose opening degrees are within the optimal opening range exceeds a preset first proportion threshold.

6. The step-by-step adaptive heating system according to claim 1, characterized in that: The primary control unit comprises: A primary communication module is used to communicate with each of the secondary heating pipe networks below it, and to communicate with the heating source above it; A primary circulating water pump is arranged in the main pipeline of the primary heating pipe network where it is located, and is used to maintain the circulation flow of heating water in the primary heating pipe network; The primary frequency modulation module is used to adjust the frequency of the primary circulating water pump.

7. The step-by-step adaptive heating system according to claim 1, characterized in that: The heating control unit comprises: The main communication module is used to communicate with each of the lower-level primary heating pipe networks; The water temperature control module is configured to adjust the temperature of the heating water heated by the heating device according to a preset water temperature control target.

8. The step-by-step adaptive heating system according to claim 7, characterized in that: The preset water temperature control target is: On the basis that there is no heat deficit in each secondary heating pipeline network downstream of the heat source, the proportion of secondary heating pipeline networks with heat surplus is made lower than a preset fourth ratio threshold.

9. The step-by-step adaptive heating system according to claim 8, characterized in that: For any secondary heating network, when its terminal pressure difference reaches a preset pressure difference threshold, and the proportion of terminal valves in the secondary heating network whose opening is less than the optimal opening range exceeds a preset second proportion threshold, the secondary heating network has a heat surplus; For any secondary heating network, when the proportion of terminal valves in the secondary heating network whose opening is greater than the optimal opening range exceeds a preset third proportion threshold, there is a heat gap in the secondary heating network.

10. The step-by-step adaptive heating system according to claim 8, characterized in that: The primary heating network also includes: The heat locking unit is used to measure the actual heat consumption of each secondary heating pipeline network below it, and to heat lock the secondary heating pipeline network whose actual heat consumption ratio exceeds a preset heat ratio threshold.

11. The step-by-step adaptive heating system according to claim 10, characterized in that: The primary control unit is configured to adjust the heating water flow in the primary heating network according to a preset primary control target, wherein the primary control target is specifically: On the basis that the actual heat consumption proportion of each secondary heating network under the primary heating network does not exceed the heat proportion threshold, the proportion of terminal valves in the primary heating network whose opening degrees are within the optimal opening range exceeds a preset first proportion threshold.

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