A heat balance control system

Abstract

The application relates to the technical field of central heating, and provides a heat supply balance control system, wherein a third interface of a secondary side heat exchanger is connected with a fourth pipeline, a unit building pipeline, a return water pipe and a fifth pipeline through a third pipeline, and a fourth interface of the secondary side heat exchanger is sequentially connected; a third bypass with a fourth control valve is arranged between the fourth pipeline and the fifth pipeline; a second temperature transmitter and a fifth control valve are arranged on the fourth pipeline, a plurality of third temperature transmitters are arranged on the unit building pipeline, and a fourth temperature transmitter is arranged on the return water pipe; the second temperature transmitter, the fourth control valve, the fifth control valve and the third temperature transmitters are electrically connected with corresponding sub-controllers. Therefore, the application can accurately control according to the specific temperature of the unit building, and due to the bypass, when a certain unit building is adjusted, other unit buildings are hardly affected.

Description

Technical Field

[0001] This invention relates to the field of centralized heating technology and provides a heat balance control system. Background Technology

[0002] With the continuous increase in the area of ​​centralized heating in Chinese cities, the number of heating system operation and management personnel is also constantly increasing, which greatly increases the cost of centralized heating. At the same time, the majority of heat users have also put forward higher requirements for the temperature quality and stability of heating.

[0003] Existing heating balance control generally controls the return water temperature of the secondary side pipes. Moreover, the heating pipes in each unit building are directly connected in parallel between the secondary side supply and return water pipes. Once the water supply of one unit building is adjusted, the water volume of other buildings will be affected. This places high demands on the pipes and controllers. Therefore, the control within a unit building is usually achieved by the user controlling the valves on the heating system. It is impossible to automatically adjust the temperature of the entire building according to the temperature in the unit building, resulting in a significant waste of heat. Summary of the Invention

[0004] To address the aforementioned shortcomings, the present invention aims to provide a heating balance control system that solves the problem that existing heating balance control systems cannot adjust at the unit / building level according to specific circumstances. The system includes a piping system, a main controller, and sub-controllers. The main controller and sub-controllers are electrically connected. The piping system includes a primary heat exchanger and a secondary heat exchanger. The first interface of the primary heat exchanger is fixedly connected to a first pipeline, the second interface is fixedly connected to a ninth pipeline, and the third interface is connected to the first interface of the secondary heat exchanger via a second pipeline. The second interface of the secondary heat exchanger is connected to the fourth interface of the primary heat exchanger via an eighth pipeline, and the third interface is connected to several fourth pipelines via a third pipeline. The fourth pipelines are connected to the unit / building pipeline, the return water pipe, the fifth pipeline, and the fourth interface of the secondary heat exchanger in sequence. A third bypass is installed between the fourth and fifth pipelines, and a fourth control valve is installed on the third bypass.

[0005] The third pipeline is equipped with a second circulating pump and a first temperature transmitter; the fourth pipeline is equipped with a second temperature transmitter and a fifth control valve; the unit building pipeline is installed inside the unit building; several third temperature transmitters are installed inside the unit building; and a fourth temperature transmitter is installed on the return water pipe.

[0006] The first temperature transmitter and the second circulating pump are both electrically connected to the main controller;

[0007] The second temperature transmitter, the fourth control valve, the fifth control valve, and the third temperature transmitter are all electrically connected to their respective sub-controllers.

[0008] Furthermore, a first circulation pump and a third control valve are installed on the second pipeline, and a second bypass is installed between the eighth pipeline and the second pipeline, with a sixth control valve installed on the second bypass; the first circulation pump, the third control valve, and the sixth control valve are all electrically connected to the main controller.

[0009] Furthermore, a first bypass is installed between the first pipeline and the ninth pipeline, a first control valve is installed on the first bypass, and a second control valve is installed on the first pipeline. Both the first control valve and the second control valve are electrically connected to the main controller.

[0010] The first pipeline, the ninth pipeline, the second pipeline, and the eighth pipeline are also equipped with a sixth temperature transmitter, a seventh temperature transmitter, an eighth temperature transmitter, and a ninth temperature transmitter, which are electrically connected to the main controller.

[0011] Furthermore, a third circulation pump is installed on the second pipeline as a backup for the first circulation pump; a fourth circulation pump is also installed on the third pipeline as a backup for the second circulation pump.

[0012] Furthermore, the first pipeline is also equipped with a seventh control valve as a backup for the second control valve.

[0013] Furthermore, a first pressure transmitter is installed on the third pipeline, a second pressure transmitter is installed on the fourth pipeline, a third pressure transmitter is installed on the return water pipe, and a fourth pressure transmitter is installed on the fifth pipeline. The first, second, third, and fourth pressure transmitters are all electrically connected to the main controller.

[0014] Furthermore, the first, third, second, and fourth circulating pumps are all variable frequency pumps, and are electrically connected to the main power line through corresponding sub-power lines. Electromagnetic relays, inductors, and variable frequency controllers are installed sequentially on the sub-power lines from the main power line to the corresponding circulating pump. The inductors are electrically connected to the controllers and electromagnetic relays in sequence.

[0015] The system is implemented through the following steps: the sub-controller acquires the average temperature of several third temperature transmitters as T3, the temperature measured by the second temperature transmitter as T2, and the temperature measured by the fourth temperature transmitter as T4; calculates the temperature difference ΔT2 between T2 and T4; calculates the relationship between ΔT2 and ΔT2'; and calculates the relationship between T3 and the set temperature within the unit building as T. MThe temperature difference ΔT5 between the three temperature transmitters is calculated. The main controller acquires the temperatures T1, T5, T6, T7, T8, and T9 measured by the first, fifth, sixth, seventh, eighth, and ninth temperature transmitters in real time. It calculates the temperature difference ΔT1 between T1 and T5, ΔT2 between T2 and T4, ΔT3 between T6 and T7, and ΔT4 between T8 and T9. It also calculates the relationship between ΔT1, ΔT2, ΔT3, and ΔT4 and their corresponding setpoints ΔT1´, ΔT2´, ΔT3´, and ΔT4´. If T1 is greater than or equal to its corresponding setpoint T1´ and ΔT1 is equal to ΔT1´, the adjustment process is completed by the sub-controller through the sub-adjustment process; otherwise, the main controller intervenes and enters the main adjustment process.

[0016] The sub-adjustment process is as follows: if ΔT5 is a positive value, the sub-controller increases the opening of the fourth control valve and decreases the opening of the fifth control valve according to ΔT5, until T3 meets the requirements; if ΔT5 is a negative value, that is, T3 is less than T... M If the sub-controller receives a value T1 greater than or equal to the set value T1', it will adjust the control valve. The sub-controller will decrease the opening of the fourth control valve and increase the opening of the fifth control valve based on ΔT5 until T3 meets the requirements. If T3 equals T... M If ΔT2 is greater than the set temperature difference ΔT2´, then the sub-controller increases the opening of the fourth control valve and decreases the opening of the fifth control valve based on the difference between ΔT2 and ΔT2´.

[0017] Further, the main control process is as follows: if T1 is less than T1' and T8 is greater than or equal to the set value T8', the main controller increases the opening of the third control valve and decreases the opening of the sixth control valve until ΔT4 equals the set value ΔT4'; if the third control valve is fully open and the sixth control valve is closed, and ΔT4 is less than ΔT4', the main controller controls the increase of the head of the first circulating pump until ΔT4 equals ΔT4'; if T8 is less than T8' and T6 is greater than or equal to the set value T6', the main controller increases the opening of the second control valve and decreases the opening of the first control valve until ΔT3 equals its set value ΔT3'.

[0018] If T1 is greater than or equal to T1', T6 is greater than or equal to the set value T6', and T8 is greater than or equal to T8', the main controller adjustment further includes the following adjustment steps: if ΔT4 is greater than the set value ΔT4', the main controller reduces the head of the first circulating pump until ΔT4 equals ΔT4'; if ΔT4 equals its set value ΔT4', and ΔT3 is greater than the set value ΔT3', the main controller increases the opening of the first control valve and decreases the opening of the second control valve until ΔT3 equals ΔT3'.

[0019] The present invention has the following beneficial technical effects:

[0020] By setting up a third bypass, a fourth control valve, a fifth control valve, a second temperature transmitter, a third temperature transmitter, and a fourth temperature transmitter electrically connected to the sub-controller, the temperature of a single unit building can be adjusted according to the overall temperature situation in the unit building, thus maintaining a balanced temperature throughout the entire unit building. Due to the existence of the bypass, when an adjustment is made in one unit building, other units are almost unaffected. In addition, the temperature adjustment of the unit building is performed by the sub-controller, which has almost no impact on the overall operation of the secondary side, making the overall design more reasonable.

[0021] When the secondary side water supply temperature is lower than the design requirement, the main controller intervenes to control it. The main controller can control the stable operation of the primary side, secondary side, and heat source side, achieving temperature balance throughout the heating pipeline, and can automatically adjust according to actual needs. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the pipeline system structure of the present invention;

[0023] Figure 2 Electrical connection diagram of the circulating pump;

[0024] In the diagram: 1-First pipeline, 2-First control valve, 3-First bypass, 4-Second control valve, 5-Primary heat exchanger, 6-Second pipeline, 7-First circulating pump, 8-Second bypass, 9-Third control valve, 10-Secondary heat exchanger, 11-Third pipeline, 12-Second circulating pump, 13-First pressure transmitter, 14-First temperature transmitter, 15-Fourth pipeline, 16-Second pressure transmitter, 17-Second temperature transmitter, 18-Third bypass, 19-Fourth control valve, 20-Fifth control valve, 21-Third temperature transmitter, 22-Fourth temperature transmitter, 23-Third pressure transmitter, 24-Fifth pipeline, 25-Fifth temperature transmitter, 26-Fourth pressure transmitter, 27-Sixth control valve, 28-Make-up water pump, 29-Sixth pipeline, 30-Water tank;

[0025] 40-Main power supply line, 41-Sub-power supply line, 42-Electromagnetic relay, 44-Inductor, 43-Electrical controller, 45-Frequency controller, 46-Power frequency power supply line. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0027] The purpose of this invention is to provide a heat supply balance control system, including a piping system, a main controller, and sub-controllers.

[0028] See piping system Figure 1 It includes a primary heat exchanger 5 and a secondary heat exchanger 10; the first interface of the primary heat exchanger 5 is fixedly connected to the first pipeline 1, and a second control valve 4 is installed on the first pipeline 1. A seventh control valve is also installed at the position where the second control valve 4 is installed on the first pipeline 1, as a backup valve for the second control valve 4, so as to ensure that the first pipeline 1 can maintain normal operation when the second control valve 4 fails.

[0029] The second port of the primary heat exchanger 5 is fixedly connected to the ninth pipe. A first bypass 3 is installed between the first pipe 1 and the ninth pipe, and a first control valve 3 is installed on the first bypass 3. The aforementioned second control valve 4 is located between the first bypass 3 and the primary heat exchanger 5.

[0030] The first pipe 1 is used to introduce high-temperature steam, and the ninth pipe is used to return the condensate after heat exchange to the heat source.

[0031] The third port of the primary heat exchanger 5 is connected to the first port of the secondary heat exchanger 10 through the second pipe 6. The second pipe 6 can transport the water heated in the primary heat exchanger 5 to the secondary heat exchanger 10.

[0032] The second pipeline 6 is equipped with a first circulation pump 7 and a third control valve 9, wherein the first circulation pump 7 is located between the third control valve 9 and the primary side heat exchanger 5; the second pipeline 6 is equipped with a third circulation pump as a backup pump for the first circulation pump 7, so as to ensure that the second pipeline 6 can operate normally when the first circulation pump 7 fails.

[0033] The second port of the secondary heat exchanger 10 is connected to the fourth port of the primary heat exchanger 5 via the eighth pipe. A second bypass 8 is installed between the eighth pipe and the second pipe 6, and a sixth control valve 27 is installed on the second bypass 8. The connection point between the second bypass 8 and the second pipe 6 is located between the first circulating pump 7 and the third control valve 9.

[0034] The third port of the secondary heat exchanger 10 is connected to several fourth ports 15 via a third pipe 11. Several three-way valves are installed on the third pipe 11, with the number of three-way valves corresponding to the number of third pipes 11. One end of the third pipe 11 is connected to the corresponding three-way valve. The other end of the third pipe 11 is connected to the fourth pipe 15, which is connected to the unit building pipe system. The unit building pipe system is connected to the fifth pipe 24 via a return water pipe. The end of the fifth pipe 24 is connected to the fourth port of the secondary heat exchanger 10.

[0035] The third pipeline 11 is equipped with a second circulation pump 12, a first pressure transmitter 13, and a first temperature transmitter 14; a fourth circulation pump is also installed on the third pipeline 11. The fourth circulation pump serves as a backup pump for the second circulation pump 12. When the second circulation pump 12 fails, the fourth circulation pump can ensure the normal operation of the third pipeline 11.

[0036] The fourth pipeline 15 is equipped with a second pressure transmitter 16, a second temperature transmitter 17 and a fifth control valve 20; wherein the fifth control valve 20 is installed at one end of the fourth pipeline 15 near the unit building pipeline, and the second temperature transmitter 17 and the fifth control valve 20 are installed at the fourth pipeline 15 away from the fifth control valve 20.

[0037] The aforementioned building piping refers to all heating pipes and indoor pipes installed within the building. Several third-degree temperature transmitters 21 are installed within the building, and these transmitters 21 are installed in the residents' homes. Generally, one or two third-degree temperature transmitters 21 are installed on every few floors. When a floor has both sunny and shady-facing households, at least one third-degree temperature transmitter 21 should be installed in one sunny-facing household and one shady-facing household.

[0038] A fourth temperature transmitter 22 and a third pressure transmitter 23 are installed on the return water pipe.

[0039] A third bypass 18 is installed between the fourth pipe 15 and the fifth pipe 24, and a fourth control valve 19 is installed on the third bypass 18. The aforementioned fifth control valve 20 is installed between the unit building pipe and the connection point between the third bypass 18 and the fourth pipe 15.

[0040] A fifth temperature transmitter 25 and a fourth pressure transmitter 26 are installed on the fifth pipeline 24, and the fifth temperature transmitter 25 and the fourth pressure transmitter 26 are installed at the end of the fifth pipeline 24 near the secondary heat exchanger 10.

[0041] The entire piping system is controlled by a control system, which includes a main controller and several sub-controllers, all installed within the unit buildings. All sub-controllers are electrically connected to the main controller, controlled by it, and transmit all generated data to the main controller. The main controller has a database for storing data received or generated during operation.

[0042] The aforementioned second temperature transmitter 17, fourth control valve 19, fifth control valve 20, third temperature transmitter 21, and fourth temperature transmitter 22 are all electrically connected to their respective sub-controllers.

[0043] The first control valve 2, the second control valve 4, the seventh control valve, the first circulating pump 7, the third circulating pump, the sixth control valve 27, the third control valve 9, the second circulating pump 12, the fourth circulating pump, the first pressure transmitter 13, the second pressure transmitter 16, the third pressure transmitter 23, the fourth pressure transmitter 26, and the first temperature transmitter 14 are all electrically connected to the main controller.

[0044] A sixth temperature transmitter, a seventh temperature transmitter, a eighth temperature transmitter, and a ninth temperature transmitter are respectively installed on the first pipeline 1, the ninth pipeline, the second pipeline 6, and the eighth pipeline, and these temperature transmitters are all electrically connected to the main controller.

[0045] All of the above control valves are equipped with ultrasonic flow meters.

[0046] The pressure sensors mentioned above are used to measure the pressure of the corresponding pipeline. If the vertical pressure of a certain pressure transmitter continues to decrease, it is determined that the pipeline is losing water.

[0047] The temperature measured by the first temperature transmitter 14 is T1, the temperature measured by the second temperature transmitter 17 is T2, the average temperature measured by several third temperature transmitters 21 is T3, the temperature measured by the fourth temperature transmitter 22 is T4, the temperature measured by the fifth temperature transmitter 25 is T5, the temperature measured by the sixth temperature transmitter is T6, the temperature measured by the seventh temperature transmitter is T7, the temperature measured by the eighth temperature transmitter is T8, and the temperature measured by the ninth temperature transmitter is T9; the temperature difference between T1 and T5 is ΔT1; the temperature difference between T2 and T4 is ΔT2; the temperature difference between T6 and T7 is ΔT3; and the temperature difference between T8 and T9 is ΔT4.

[0048] The set temperature inside the apartment building is T. M The temperature difference between it and T3 is ΔT5.

[0049] During the heating process, the bypass and other pipelines of this system are all in the open state.

[0050] The control process based on the above system is as follows.

[0051] The main controller is based on T M The supply and return water temperatures of the primary heat exchanger 5 and the secondary heat exchanger 10 are generated and monitored in real time. The system starts running. During operation, the flow rate and velocity of the medium on both sides of the primary heat exchanger 5 and the secondary heat exchanger 10 remain stable, that is, the temperature of the hot water flowing out of the primary heat exchanger 5 and the secondary heat exchanger 10 remains constant.

[0052] During operation, the main controller acquires the supply and return water temperatures of the primary heat exchanger 5 and the secondary heat exchanger 10 in real time during the above-mentioned adjustment process, compares them with the set values, and calculates ΔT1, ΔT4, and ΔT3. The sub-controller calculates ΔT2 in real time.

[0053] The main controller first determines the magnitude of T1 and its corresponding setpoint T1´, and the magnitude of ΔT1 and its corresponding setpoint ΔT1´.

[0054] If T1 is greater than or equal to its corresponding setpoint T1´ and ΔT1 is equal to ΔT1´, the adjustment process is completed by the sub-controller through the sub-adjustment process; otherwise, the main controller intervenes and enters the main adjustment process.

[0055] The sub-controller acquires T3 for the building unit in real time and calculates ΔT5. If ΔT5 is positive, that is, T3 is greater than T... M The sub-controller increases the opening of the fourth control valve 19 and decreases the opening of the fifth control valve 20 based on ΔT5, until T3 meets the requirements. ， That is, T3 is close to or equal to T. M .

[0056] If ΔT5 is negative, that is, T3 is less than T M If the sub-controller receives a value T1 greater than or equal to the set value T1', it will send the information to the main controller. If the main controller receives a value T1 greater than or equal to the set value T1', the sub-controller will make adjustments. The sub-controller will decrease the opening of the fourth control valve 19 and increase the opening of the fifth control valve 20 based on ΔT5, until T3 equals T1'. M .

[0057] If T3 equals T M If ΔT2 is greater than the set temperature difference ΔT2´, the sub-controller will increase the opening of the fourth control valve 19 and decrease the opening of the fifth control valve 20 according to the difference between ΔT2 and ΔT2´, until ΔT2 meets the requirements.

[0058] Because a bypass is provided between the fourth pipe 15 and the fifth pipe 24, the flow regulation of a single unit building has a relatively small impact on the regulation of other units buildings.

[0059] If T1 is greater than or equal to T1' and ΔT1 is greater than ΔT1', the main controller adjusts the second circulation pump 12 according to the difference between ΔT1 and ΔT1', increasing its head or power. If T1 is greater than or equal to T1' and ΔT1 is less than ΔT1', the head or power of the second circulation pump 12 is decreased.

[0060] When T1 is less than T1', the main controller controls the primary side piping. If T1 is less than T1' and T8 is greater than or equal to the corresponding setpoint T8', the main controller increases the opening of the third control valve 9 and decreases the opening of the sixth control valve 27 until ΔT4 equals its corresponding setpoint ΔT4'. If the opening of the third control valve 9 reaches its maximum and the sixth control valve 27 closes, and ΔT4 is less than ΔT4', the main controller increases the head or power of the first circulating pump until ΔT4 equals ΔT4'. If T8 is less than the corresponding setpoint T8' and T6 is greater than or equal to its setpoint T6', the main controller increases the opening of the second control valve 4 and decreases the opening of the first control valve 2 until ΔT3 equals its setpoint ΔT3'.

[0061] If T1 is greater than or equal to T1', and T6 and T8 are greater than or equal to their preset values, the main controller adjustment also includes the following adjustment steps: If ΔT4 is greater than its set value ΔT4', the main controller first reduces the head or power of the first circulating pump 7. If the first circulating pump 7 is reduced to the minimum head or power ΔT4, but it is still greater than its set value ΔT4', the main controller first reduces the opening of the third control valve 9 and increases the opening of the sixth control valve 27 until ΔT4 equals ΔT4'. If ΔT4 equals its set value ΔT4' and ΔT3 is greater than its set value ΔT3', the main controller increases the opening of the first control valve 2 and decreases the opening of the second control valve 4 until ΔT3 equals ΔT3'.

[0062] It also includes a water replenishment system for replenishing water to the secondary side pipeline. The water replenishment system includes a water tank 30, which is connected to the fifth pipeline 24 via a sixth pipeline 29. A water replenishment pump 28 and a water replenishment valve are installed on the sixth pipeline 29. A backup water replenishment pump is also installed on the sixth pipeline 29. When the water replenishment pump 28 fails, water can be replenished by the backup water replenishment pump.

[0063] All of the pumps mentioned above are variable frequency pumps, and the circuit connection diagrams are attached. Figure 2 As shown, a sub-power line 41 is electrically connected to the main power line 40. This sub-power line 41 is electrically connected to the corresponding variable frequency pump, providing power to the pump. An electromagnetic relay 42, an inductor 44, and a variable frequency controller 45 are sequentially installed on the sub-power line 41 from the main power line 40 towards the variable frequency pump. The variable frequency controller 45 is electrically connected to the pump and controls its variable frequency operation. The electromagnetic relay 42 is connected to the pump via a mains power line 46. The inductor 44 is sequentially electrically connected to the controller 43 and the electromagnetic relay 42. During normal operation, current flows through the sub-power line 41, and the inductor 44 receives a signal, which is then sent to the controller 43. When the controller 45 malfunctions, there is no current in the sub-power line 41, the controller 43 does not receive a signal from the inductor, or the received signal suddenly changes drastically. In this case, the controller energizes the electromagnetic relay 42, allowing the pump to be powered via the mains power line 46.

[0064] Therefore, the device can achieve precise temperature regulation in the pipeline through the cooperation of the main controller, sub-controllers, various temperature transmitters, regulating valves and bypasses, and ultimately achieve heat balance at the user end.

[0065] Of course, there may be other embodiments of the present invention. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications based on the present invention. However, all such corresponding changes and modifications should fall within the protection scope of the appended claims.

Claims

1. A heat supply balance control system, characterized in that, The system includes a piping system, a main controller, and a sub-controller. The main controller and the sub-controller are electrically connected. The piping system includes a primary heat exchanger (5) and a secondary heat exchanger (10). The first interface of the primary heat exchanger (5) is fixedly connected to the first pipeline (1), the second interface is fixedly connected to the ninth pipeline, and the third interface is connected to the first interface of the secondary heat exchanger (10) through the second pipeline (6). The second interface of the secondary heat exchanger (10) is connected to the fourth interface of the primary heat exchanger (5) through the eighth pipeline, and the third interface is connected to several fourth pipelines (15) through the third pipeline (11). The fourth pipelines (15) are connected to the unit building pipeline, the return water pipe, the fifth pipeline (24), and the fourth interface of the secondary heat exchanger (10) are connected in sequence. A third bypass (18) is installed between the fourth pipeline (15) and the fifth pipeline (24), and a fourth control valve (19) is installed on the third bypass (18). The third pipeline (11) is equipped with a second circulating pump (12) and a first temperature transmitter (14); the fourth pipeline (15) is equipped with a second temperature transmitter (17) and a fifth control valve (20); the unit building pipeline is installed inside the unit building; several third temperature transmitters (21) are installed inside the unit building; and a fourth temperature transmitter (22) is installed on the return water pipe. A fifth temperature transmitter (25) is installed on the fifth pipeline (24); The first temperature transmitter (14) and the second circulating pump (12) are both electrically connected to the main controller; The second temperature transmitter (17), the fourth control valve (19), the fifth control valve (20), and the third temperature transmitter (21) are all electrically connected to their respective sub-controllers; The second pipeline (6) is equipped with a first circulation pump (7) and a third control valve (9). The eighth pipeline is connected to the second pipeline (6) by a second bypass (8). The second bypass (8) is equipped with a sixth control valve (27). The first circulation pump (7), the third control valve (9), and the sixth control valve (27) are all electrically connected to the main controller. A first bypass (3) is installed between the first pipeline (1) and the ninth pipeline. A first control valve (2) is installed on the first bypass (3). A second control valve (4) is installed on the first pipeline (1). Both the first control valve (2) and the second control valve (4) are electrically connected to the main controller. The first pipeline (1), the ninth pipeline, the second pipeline (6), and the eighth pipeline are respectively equipped with a sixth temperature transmitter, a seventh temperature transmitter, an eighth temperature transmitter, and a ninth temperature transmitter that are electrically connected to the main controller; The system is implemented through the following steps: The sub-controller acquires the average temperature of several third temperature transmitters (21) as T3, the temperature measured by the second temperature transmitter (17) as T2, and the temperature measured by the fourth temperature transmitter (22) as T4, calculates the temperature difference ΔT2 between T2 and T4, and calculates the relationship between ΔT2 and ΔT2´; calculates the temperature difference between T3 and the set temperature in the unit building as T M The temperature difference ΔT5 between them; the main controller acquires in real time the temperature T1 measured by the first temperature transmitter (14), the temperature T5 measured by the fifth temperature transmitter (25), the temperature T6 measured by the sixth temperature transmitter, the temperature T7 measured by the seventh temperature transmitter, the temperature T8 measured by the eighth temperature transmitter, and the temperature T9 measured by the ninth temperature transmitter, calculates the temperature difference ΔT1 between T1 and T5, the temperature difference ΔT2 between T2 and T4, the temperature difference ΔT3 between T6 and T7, and the temperature difference ΔT4 between T8 and T9, and calculates the relationship between ΔT1, ΔT2, ΔT3, ΔT4 and the corresponding set values ​​ΔT1´, ΔT2´, ΔT3´, ΔT4´; if T1 is greater than or equal to its corresponding set value T1´, and ΔT1 is equal to ΔT1´, then the adjustment process is completed by the sub-controller through the sub-adjustment process; otherwise, the main controller intervenes and enters the main adjustment process; The sub-regulation process is as follows: if ΔT5 is positive, the sub-controller increases the opening of the fourth control valve (19) and decreases the opening of the fifth control valve (20) according to ΔT5 until T3 meets the requirements; if ΔT5 is negative, that is, T3 is less than T M If the sub-controller sends the information to the main controller, and the main controller receives a value T1 greater than or equal to the set value T1´, then the sub-controller will adjust the settings. The sub-controller will reduce the opening of the fourth control valve (19) and increase the opening of the fifth control valve (20) according to ΔT5 until T3 meets the requirements; if T3 equals T... M If ΔT2 is greater than the set temperature difference ΔT2´, then the sub-controller increases the opening of the fourth control valve (19) and decreases the opening of the fifth control valve (20) according to the difference between ΔT2 and ΔT2´. The main adjustment process is as follows: if T1 is less than T1´ and T8 is greater than or equal to the set value T8´, the main controller increases the opening of the third control valve (9) and decreases the opening of the sixth control valve (27) until ΔT4 is equal to the set value ΔT4´. If the third control valve (9) is fully open and the sixth control valve (27) is closed, and ΔT4 is less than ΔT4´, the main controller controls the increase of the head of the first circulating pump until ΔT4 is equal to ΔT4´. If T8 is less than T8´ and T6 is greater than or equal to the set value T6´, the main controller increases the opening of the second control valve (4) and decreases the opening of the first control valve (2) until ΔT3 is equal to its set value ΔT3´. If T1 is greater than or equal to T1´, T6 is greater than or equal to the set value T6´, and T8 is greater than or equal to T8´, the main controller adjustment further includes the following adjustment steps: if ΔT4 is greater than the set value ΔT4´, the main controller reduces the head of the first circulating pump (7) until ΔT4 equals ΔT4´; if ΔT4 equals its set value ΔT4´, and ΔT3 is greater than the set value ΔT3´, the main controller increases the opening of the first control valve (2) and decreases the opening of the second control valve (4) until ΔT3 equals ΔT3´.

2. The heat supply balance control system according to claim 1, characterized in that, A third circulation pump is installed on the second pipeline (6) as a backup for the first circulation pump (7); a fourth circulation pump is also installed on the third pipeline (11) as a backup for the second circulation pump (12).

3. The heat supply balance control system according to claim 2, characterized in that, The first pipeline (1) is also equipped with a seventh control valve as a backup for the second control valve (4).

4. The heat supply balance control system according to claim 3, characterized in that, A first pressure transmitter (13) is installed on the third pipeline (11), a second pressure transmitter (16) is installed on the fourth pipeline (15), a third pressure transmitter (23) is installed on the return water pipe, and a fourth pressure transmitter (26) is installed on the fifth pipeline (24). The first pressure transmitter (13), the second pressure transmitter (16), the third pressure transmitter (23), and the fourth pressure transmitter (26) are all electrically connected to the main controller.

5. The heat supply balance control system according to claim 4, characterized in that, The first circulating pump (7), the third circulating pump, the second circulating pump (12), and the fourth circulating pump are all variable frequency pumps, and are electrically connected to the main power line (40) through corresponding sub-power lines (41). Electromagnetic relays (42), inductors (44), and frequency converters (45) are installed sequentially on the sub-power lines (41) from the main power line (40) to the corresponding circulating pump. The inductors (44) are electrically connected to the electronic controller (43) and the electromagnetic relays (42) in sequence.

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