Pressure matching system of normal-pressure heat storage tank and regulation and control method

Abstract

The invention discloses a pressure matching system of a normal-pressure heat storage tank and a regulation and control method. The pressure matching system comprises the normal-pressure heat storage tank, a water supply hot side system, a water return cold side system, an analysis decision module and a control module. The water supply hot side system comprises a hot side pipe, and an electric valve, an electric control valve, a hot side turbine, a booster pump and a check valve which are arranged on the hot side pipe, the water return cold side system comprises a cold side pipe, and an electric valve and a cold side turbine which are arranged on the cold side pipe, and the cold side turbine is connected with the hot side turbine through a transmission shaft. Under the heat storage working condition, the residual pressure head between the heat network water supply pipe and the top hot water side of the heat storage tank is used for boosting cold water at the bottom of the heat storage tank to the heat network water return pipe to provide power; under the heat release working condition, the residual pressure head between the heat supply network water return pipe and the cold water side at the bottom of the heat storage tank is used for providing power for boosting of hot water at the top of the heat storage tank to the heat supply network water supply pipe, throttling loss energy of the normal-pressure heat storage tank in the heat storage and heat release process is recycled, and the operation energy consumption of the heat storage tank is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy conservation in centralized heating systems, and in particular relates to a pressure matching system and a control method for a normal pressure heat storage tank. Background Art

[0002] Heat storage tanks are an important technical means to improve the flexibility and reliability of urban centralized heating systems. The connection methods of heat storage tanks and heat networks are divided into direct and indirect connection methods. In the indirect connection method, the heat storage tank needs to exchange heat with the heat network through a heat exchanger or a heat pump. The system is relatively complex, the initial investment of the equipment is high, and the heat storage and release efficiency is low due to the need for heat exchange. In the direct connection method, the heat storage tank is directly incorporated into the heat network. The system operation is simple, the initial investment is low, the heat storage and release efficiency is high, but the pressure control requirements of the system are high. In the traditional direct connection mode, a regulating valve or a throttle valve is usually set between the top of the heat storage tank and the water supply pipe, and the bottom of the heat storage tank and the return pipe. It is used to cooperate with the heat storage tank booster pump to control the water flow in and out of the heat storage tank during the heat release and heat storage process, and then adjust the operating conditions of the heat storage tank. However, the above method of using a regulating valve or a throttle valve in conjunction with a heat storage tank booster pump to adjust the working conditions of the heat storage tank has a large amount of throttling loss, and huge energy is lost over the years. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a pressure matching system and control method for a normal pressure heat storage tank. In the heat storage condition, the residual pressure head between the heat network water supply pipe and the hot water side at the top of the heat storage tank is used to provide power for the cold water at the bottom of the heat storage tank to increase the pressure to the heat network return pipe; in the heat release condition, the residual pressure head between the heat network return pipe and the cold water side at the bottom of the heat storage tank is used to provide power for the hot water at the top of the heat storage tank to increase the pressure to the heat network water supply pipe, thereby recovering the throttling loss energy of the normal pressure heat storage tank in the heat storage and heat release process, reducing the energy consumption of the heat storage tank during operation, improving the economic efficiency of system operation, and achieving good economic and social benefits.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: The present invention provides a pressure matching system for a normal pressure heat storage tank: Atmospheric pressure heat storage tank; A water supply hot side system, the water supply hot side system comprises a hot side pipe and a first electric valve, an electric regulating valve, a second electric valve, a hot side impeller, a third electric valve, a fourth electric valve, a booster pump, and a check valve arranged on the hot side pipe, wherein the inlet of the first electric valve is connected to the water supply pipe, and the outlet is connected to the inlet of the electric regulating valve, the outlet of the electric regulating valve is connected to the inlet of the second electric valve, the outlet of the second electric valve is connected to the inlet of the hot side impeller, the outlet of the hot side impeller is connected to the inlet of the fourth electric valve, and the outlet of the fourth electric valve is connected to the atmospheric pressure heat storage tank. The inlet of the third electric valve is connected to the inlet of the hot side impeller, and the outlet is connected to the inlet of the booster pump. The outlet of the booster pump is connected to the inlet of the check valve, and the outlet of the check valve is connected to the water supply pipe. The outlet of the fourth electric valve is provided with a third pressure signal acquisition terminal, the inlet of the hot side impeller is provided with a second pressure signal acquisition terminal, the outlet of the first electric valve is provided with a first pressure signal acquisition terminal, and the outlet of the booster pump is provided with a seventh pressure signal acquisition terminal, and the booster pump is driven by a variable frequency motor; A return water cold side system, the return water cold side system comprises a cold side pipe and a fifth electric valve, a cold side impeller, and a sixth electric valve arranged on the cold side pipe, the inlet of the sixth electric valve is connected to the return water pipe, and the outlet is connected to the inlet of the cold side impeller, the outlet of the cold side impeller is connected to the inlet of the fifth electric valve, the outlet of the fifth electric valve is connected to the lower cold water side interface of the atmospheric pressure heat storage tank, the outlet of the fifth electric valve is provided with a fourth pressure signal acquisition terminal, the inlet of the cold side impeller is provided with a fifth pressure signal acquisition terminal, the inlet of the sixth electric valve is provided with a sixth pressure signal acquisition terminal, and the cold side impeller is connected to the hot side impeller through a transmission shaft; An analysis and decision module, which is used to receive the dispatch signal of the host computer, collect the output signals of the first pressure signal acquisition terminal, the second pressure signal acquisition terminal, the third pressure signal acquisition terminal, the fourth pressure signal acquisition terminal, the fifth pressure signal acquisition terminal, the sixth pressure signal acquisition terminal and the seventh pressure signal acquisition terminal, comprehensively analyze the pressure difference between the water supply pipe and the upper hot water side of the normal pressure heat storage tank, and between the return pipe and the lower cold water side of the normal pressure heat storage tank, and send control information to the control module; A control module, wherein the control module is used to output control signals to the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, the sixth electric valve, the electric regulating valve, and the variable frequency motor, to control the switching states of the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, and the sixth electric valve, and to adjust the valve opening of the electric regulating valve and the operating frequency of the variable frequency motor.

[0005] Furthermore, the atmospheric pressure heat storage tank is also provided with an air release valve to ensure that the atmospheric pressure heat storage tank is directly connected to the atmosphere.

[0006] Based on the above pressure matching system, the present invention also proposes a control method for the pressure matching system of a normal pressure heat storage tank, comprising: Step S1: When the heat network load is normal, the analysis and decision module receives the upper dispatch signal and the system is not put into operation; Step S2: When the heat network load is sufficient, the system switches to the heat storage mode by receiving the upper dispatch signal through the analysis and decision module, establishes the hydraulic model of the system in the heat storage mode, and regulates the pressure value set at the upper interface of the atmospheric heat storage tank and the pressure target value set at the return pipe by the electric regulating valve in coordination with the hot side impeller and the cold side impeller; Step S3, when the heat network load is insufficient, the system receives the upper dispatch signal through the analysis and decision module, switches to the heat release mode, establishes the hydraulic model of the system in the heat release mode, and regulates the pressure value set at the lower interface of the atmospheric heat storage tank and the pressure target value set entering the water supply pipe through the booster pump in conjunction with the hot side impeller and the cold side impeller.

[0007] Furthermore, in step S2, when the heat network load is sufficient, the system switches to the heat storage mode by receiving the upper dispatch signal through the analysis and decision module, establishes a hydraulic model of the system in the heat storage mode, and regulates the pressure value set at the upper interface of the atmospheric heat storage tank and the pressure target value set at the return pipe by the electric regulating valve in cooperation with the hot side impeller and the cold side impeller, including the following steps: S21, the analysis and decision module receives the upper dispatch signal and sends the control information to the control module, and the system switches to the heat storage mode; S22, the first electric valve, the second electric valve, the fourth electric valve, the fifth electric valve, and the sixth electric valve are opened, the third electric valve is closed, and the high-temperature water flows into the upper part of the atmospheric pressure heat storage tank through the hot side pipe and drives the hot side impeller; S23, the hot side impeller recovers the throttling loss energy from the water supply pipe to the upper interface of the atmospheric pressure heat storage tank, and at the same time, acts as a driving source to drive the cold side impeller through the transmission shaft to pump the cold water in the atmospheric pressure heat storage tank out from the lower part of the tank, and the cold water flows into the return pipe through the cold side pipe; S24, according to the pressure value set at the upper interface of the atmospheric pressure heat storage tank and the pressure target value set at the return pipe, obtain the pressure signal of the third pressure signal acquisition terminal and the pressure signal of the sixth pressure signal acquisition terminal at the outlet of the sixth electric valve, and judge whether the pressure value of the upper interface of the atmospheric pressure heat storage tank and the pressure value entering the return pipe meet the standards. If they meet the standards, keep running until the atmospheric pressure heat storage tank completes heat storage, and enter step S1; S25. If the standard is not met, the hydraulic model of the system in the heat storage mode is established, and the pressure target value set at the upper interface of the atmospheric heat storage tank and the pressure target value set at the return pipe are regulated by adjusting the electric control valve in coordination with the hot side impeller and the cold side impeller.

[0008] Furthermore, in step S3, when the heat network load is insufficient, the system switches to the heat release mode by receiving the upper dispatch signal through the analysis and decision module, establishes a hydraulic model of the system in the heat release mode, and regulates the pressure value set at the lower interface of the atmospheric heat storage tank and the pressure target value set at the water supply pipe by the booster pump in cooperation with the hot side impeller and the cold side impeller, including the following steps: S31, the analysis and decision module receives the upper dispatch signal and sends the control information to the control module, and the system switches to the heat release mode; S32, the third electric valve, the fourth electric valve, the fifth electric valve, and the sixth electric valve are opened, the first electric valve and the second electric valve are closed, and the low-temperature water flows into the lower part of the normal pressure heat storage tank through the cold side pipe and drives the cold side impeller; S33, the cold side impeller recovers the throttling loss energy from the return pipe to the lower interface of the atmospheric pressure heat storage tank, and at the same time, as a driving source, drives the hot and cold side impellers through the transmission shaft to pump the hot water in the atmospheric pressure heat storage tank out from the upper part of the tank. At the same time, the variable frequency motor drives the booster pump to continue to replenish the energy required for boosting, and the hot water flows into the water supply pipe through the hot side pipe; S34, according to the pressure value set at the lower interface of the normal pressure heat storage tank and the pressure target value set at the water supply pipe, obtain the pressure signal of the fourth pressure signal acquisition terminal and the pressure signal of the seventh pressure signal acquisition terminal (21) at the outlet of the booster pump, and judge whether the pressure value of the lower interface of the normal pressure heat storage tank and the pressure value of the water supply pipe meet the standards. If they meet the standards, keep running until the normal pressure heat storage tank finishes releasing heat, and enter step S1; S35. If the standard is not met, the hydraulic model of the system in the heat release mode is established, and the target pressure value set at the lower interface of the atmospheric heat storage tank and the target pressure value set at the water supply pipe are regulated by adjusting the frequency conversion motor and the booster pump in coordination with the cold side impeller and the hot side impeller.

[0009] Furthermore, the step S25 of establishing a hydraulic model of the system in the heat storage mode includes: According to the pressure flow characteristic curve of the electric control valve, the simulation function V is formulated. O =f(P1, P2, P up , P r ); Among them, V O is the valve opening, P1 is the pressure parameter collected by the first pressure signal collection terminal, P2 is the pressure parameter collected by the second pressure signal collection terminal, P up is the preset target pressure value entering the upper part of the atmospheric heat storage tank, P r It is the preset target pressure value entering the return pipe.

[0010] Further, in step S35, a hydraulic model of the system in the heat release mode is established, including: According to the characteristic curve of the booster pump (3) and the power and voltage-frequency relationship of the variable frequency motor, a simulation function F=f(P2, P5, P down , P s ); Wherein, F is the voltage frequency of the variable frequency motor, P2 is the pressure parameter collected by the second pressure signal collection terminal, P5 is the pressure parameter collected by the fifth pressure signal collection terminal, and P down is the preset target pressure value entering the lower part of the atmospheric heat storage tank, P s It is the preset target pressure value entering the water supply pipe.

[0011] Compared with the prior art, the present invention has the following beneficial effects: The present invention connects the atmospheric pressure heat storage tank with the coaxial impeller unit, the booster pump, and multiple groups of pipeline valves. In the heat storage condition, the residual pressure head between the heat network water supply pipe and the hot water side at the top of the heat storage tank is used to provide power for the cold water at the bottom of the heat storage tank to increase the pressure to the heat network return pipe; in the heat release condition, the residual pressure head between the heat network return pipe and the cold water side at the bottom of the heat storage tank is used to provide power for the hot water at the top of the heat storage tank to increase the pressure to the heat network supply pipe, thereby recovering the throttling loss energy caused by the adjustment of the electric regulating valve or the throttle valve in the heat storage and heat release process in the direct connection mode of the conventional atmospheric pressure heat storage tank, reducing the energy consumption of the heat storage tank during operation, improving the economy of the system operation, and achieving good economic and social benefits. In addition, through the control system composed of the analysis decision module, the control module, and the pressure signal acquisition terminal, the opening and closing of the electric valve and the action of the electric regulating valve and the variable frequency motor are intelligently controlled, thereby ensuring the smooth switching between the system heat storage mode and the heat release mode and the stable operation of the system during the heat storage and heat release process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a pressure matching system of a normal pressure heat storage tank of the present invention; Figure 2 The present invention is a flow chart of a control method of a pressure matching system of a normal pressure heat storage tank.

[0013] Attached Figure 1In: 1-hot side impeller; 2-cold side impeller; 3-boost pump; 4-variable frequency motor; 5-normal pressure heat storage tank; 6-vent valve; 7-first electric valve; 8-electric regulating valve; 9-second electric valve; 10-third electric valve; 11-check valve; 12-fourth electric valve; 13-fifth electric valve; 14-sixth electric valve; 15-first pressure signal acquisition terminal; 16-second pressure signal acquisition terminal; 17-third pressure signal acquisition terminal; 18-fourth pressure signal acquisition terminal; 19-fifth pressure signal acquisition terminal; 20-sixth pressure signal acquisition terminal; 21-seventh pressure signal acquisition terminal; 22-analysis and decision-making module; 23-control module. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] Embodiment 1 like Figure 1 As shown, this embodiment provides a pressure matching system for a normal pressure heat storage tank, which comprises a normal pressure heat storage tank (5), a water supply hot side system, a water return cold side system, an analysis and decision module (22) and a control module (23); The normal pressure heat storage tank (5) is provided with an upper hot side water interface and a lower cold side water interface, and is provided with an air release valve (6) to ensure that the normal pressure heat storage tank (5) is directly connected to the atmosphere; The water supply hot side system comprises a hot side pipe and a first electric valve (7), an electric regulating valve (8), a second electric valve (9), a hot side impeller (1), a third electric valve (10), a fourth electric valve (12), a booster pump (3), and a check valve (11) arranged on the hot side pipe. The inlet of the first electric valve (7) is connected to the water supply pipe, and the outlet is connected to the inlet of the electric regulating valve (8). The outlet of the electric regulating valve (8) is connected to the inlet of the second electric valve (9). The outlet of the second electric valve (9) is connected to the inlet of the hot side impeller (1). The outlet of the hot side impeller (1) is connected to the inlet of the fourth electric valve (12). The outlet of the fourth electric valve (12) is connected to the upper hot water side interface of the atmospheric heat storage tank (5). The inlet of the third electric valve (10) is connected to the inlet of the hot side impeller (1), and the outlet is connected to the booster pump (3). The inlet of the booster pump (3) is connected to the inlet of the check valve (11), the outlet of the booster pump (3) is connected to the inlet of the check valve (11), the outlet of the check valve (11) is connected to the water supply pipe, the outlet of the fourth electric valve (12) is provided with a third pressure signal acquisition terminal (17), the inlet of the hot side impeller (1) is provided with a second pressure signal acquisition terminal (16), the outlet of the first electric valve (7) is provided with a first pressure signal acquisition terminal (15), the outlet of the booster pump (3) is provided with a seventh pressure signal acquisition terminal (21), and the booster pump (3) is driven by a variable frequency motor (4); The return water cold side system comprises a cold side pipe and a fifth electric valve (13), a cold side impeller (2), and a sixth electric valve (14) arranged on the cold side pipe. The inlet of the sixth electric valve (14) is connected to the return water pipe, and the outlet is connected to the inlet of the cold side impeller (2). The outlet of the cold side impeller (2) is connected to the inlet of the fifth electric valve (13). The outlet of the fifth electric valve (13) is connected to the cold water side interface of the normal pressure heat storage tank (5). The outlet of the fifth electric valve (13) is provided with a fourth pressure signal acquisition terminal (18). The inlet of the cold side impeller (2) is provided with a fifth pressure signal acquisition terminal (19). The inlet of the sixth electric valve (14) is provided with a sixth pressure signal acquisition terminal (20). The cold side impeller (2) is connected to the hot side impeller (1) via a transmission shaft. The analysis and decision module (22) is used to receive the dispatch signal of the upper computer, collect the output signals of the first pressure signal collection terminal (15), the second pressure signal collection terminal (16), the third pressure signal collection terminal (17), the fourth pressure signal collection terminal (18), the fifth pressure signal collection terminal (19), the sixth pressure signal collection terminal (20) and the seventh pressure signal collection terminal (21), comprehensively analyze the pressure difference between the water supply pipe and the upper hot water side of the normal pressure heat storage tank (5), and between the return pipe and the lower cold water side of the normal pressure heat storage tank (5), and send control information to the control module (23); The control module (23) is used to output control signals to the first electric valve (7), the second electric valve (9), the third electric valve (10), the fourth electric valve (12), the fifth electric valve (13), the sixth electric valve (14), the electric regulating valve (8), and the variable frequency motor (4), so as to control the switching states of the first electric valve (7), the second electric valve (9), the third electric valve (10), the fourth electric valve (12), the fifth electric valve (13), and the sixth electric valve (14), and to adjust the valve opening of the electric regulating valve (8) and the operating frequency of the variable frequency motor (4).

[0016] Embodiment 2 like Figure 2 As shown, this embodiment provides a control method for a pressure matching system of a normal pressure heat storage tank, comprising: Step S1: When the heat network load is normal, the analysis and decision module (22) receives the upper dispatch signal and the system is not put into operation; Step S2: When the heat network load is sufficient, the system switches to the heat storage mode by receiving the upper dispatch signal through the analysis and decision module (22), establishes a hydraulic model of the system in the heat storage mode, and regulates the pressure value set at the upper interface of the normal pressure heat storage tank (5) and the pressure target value set at the return pipe by the electric regulating valve (8) in coordination with the hot side impeller (1) and the cold side impeller (2); Step S3, when the heat network load is insufficient, the system switches to a heat release mode by receiving a superior dispatching signal through the analysis and decision module (22), and establishes a hydraulic model of the system in the heat release mode. The booster pump (3) cooperates with the hot side impeller (1) and the cold side impeller (2) to regulate the pressure value set at the lower interface of the normal pressure heat storage tank (5) and the pressure target value set at the water supply pipe.

[0017] It should be noted that the control method of the pressure matching system of the atmospheric heat storage tank is a method for realizing heat storage and heat release operations through precise pressure control under different heat network load conditions. It not only improves the stability and reliability of the heat network, but also improves energy utilization efficiency.

[0018] 1. Status: When the heat network load is normal, it means that the current heat load demand can be directly met by the existing heat source (such as thermal power plant, boiler, etc.) without starting the heat storage tank; Operation: After receiving the upper dispatch signal, the analysis and decision module does not start the heat storage system. At this time, all related equipment (such as electric regulating valve, booster pump, hot side impeller, cold side impeller, etc.) are in standby state and no operation is performed.

[0019] 2. Status: The heat network load is sufficient, which means that the heat generated by the current heat source exceeds the actual demand of users, and there is excess heat that can be stored; Operation: 1) Receiving signals: The analysis and decision module receives the upper dispatch signal, and the system switches to the heat storage mode; 2) Establishing hydraulic model: Establishing the hydraulic model of the system in the heat storage mode to determine the working parameters of each device in the heat storage process; 3) Pressure control: Through the electric regulating valve, the hot side impeller and the cold side impeller are coordinated to adjust the pressure value of the upper interface of the normal pressure heat storage tank to match the pressure target value entering the return pipe. This ensures that the heat medium enters the heat storage tank smoothly and forms a stable water level and pressure in the heat storage tank.

[0020] 3. Status: The lack of heat network load means that the heat generated by the current heat source is not enough to meet the actual needs of users, and the stored heat needs to be released from the heat storage tank.

[0021] Operation: 1) Receiving signals: The analysis and decision module receives the upper dispatch signal, and the system switches to the heat release mode; 2) Building a hydraulic model: Building a hydraulic model of the system in the heat release mode to determine the working parameters of each device in the heat release process; 3) Pressure control: Through the booster pump, the hot side impeller and the cold side impeller are used to adjust the pressure value of the lower interface of the normal pressure heat storage tank to match the pressure target value entering the water supply pipe. This ensures that the heat medium in the heat storage tank flows out smoothly and enters the heat network to be supplied to users.

[0022] In practical applications, judging the state of the heat network load is a key step in achieving the effective operation of the atmospheric heat storage tank pressure matching system. The state of the heat network load can usually be judged by the following aspects: 1. Real-time monitoring and data analysis 1.1 Real-time data collection Heat load monitoring: through the heat load sensors (such as temperature sensors, pressure sensors, flow meters, etc.) installed at the user end and in the heat network, the user's heat load demand is monitored in real time; Heat source monitoring: monitor the heat generation capacity and current heat generation status of heat sources (such as thermal power plants, boilers, etc.); Heat storage tank status: monitor the heat storage status of the atmospheric pressure heat storage tank, including the water temperature and water volume in the heat storage tank.

[0023] 1.2 Data Analysis Load forecasting: Using historical data and weather forecast information, the future heat load demand is predicted through load forecasting models (such as time series analysis, machine learning models, etc.); Supply and demand balance: Determine the load status of the heating network by comparing the current heat load demand with the heat generation capacity of the heat source.

[0024] 2. Judgment criteria 2.1 Heating network load is normal Condition: The heat generation capacity of the heat source basically matches the heat load demand of the user, and no additional heat storage or heat release operation is required; Judgment basis: Real-time monitoring data shows that the heat load demand is close to the heat generation capacity of the heat source; Forecast models show that there will not be large fluctuations in heat load demand in the short term.

[0025] 2.2 Sufficient heat network load Condition: The heat generation capacity of the heat source is greater than the heat load demand of the user, and there is excess heat that can be stored; Judgment basis: Real-time monitoring data shows that the heat source's heat generation capacity is significantly greater than the current heat load demand; The forecast model shows that the heat load demand will be lower than the heat source's heat production capacity in the future; The current heat storage status of the atmospheric pressure heat storage tank allows further heat storage.

[0026] 2.3 Insufficient heat network load Condition: The heat generation capacity of the heat source is less than the heat load demand of the user, and the stored heat needs to be released from the heat storage tank; Judgment basis: Real-time monitoring data shows that the heat load demand is significantly greater than the heat source's heat generation capacity; The forecast model shows that the heat load demand will be higher than the heat source's heat production capacity in the future; The current heat storage state of the atmospheric pressure heat storage tank allows heat release.

[0027] In step S2, when the heat network load is sufficient, the system switches to the heat storage mode by receiving the upper dispatch signal through the analysis and decision module (22), establishes a hydraulic model of the system in the heat storage mode, and regulates the pressure value set at the upper interface of the normal pressure heat storage tank (5) and the pressure target value set at the return pipe through the electric regulating valve (8) in coordination with the hot side impeller (1) and the cold side impeller (2), including the following steps: S21, the analysis and decision module (22) receives the upper-level dispatch signal and sends control information to the control module (23), and the system switches to the heat storage mode; S22, the first electric valve (7), the second electric valve (9), the fourth electric valve (12), the fifth electric valve (13), and the sixth electric valve (14) are opened, the third electric valve (10) is closed, and the high-temperature water flows into the upper part of the atmospheric pressure heat storage tank (5) through the hot side pipe and drives the hot side impeller (1); S23, the hot side impeller (1) recovers the throttling loss energy between the water supply pipe and the upper interface of the atmospheric pressure heat storage tank (5), and at the same time acts as a driving source to drive the cold side impeller (2) through the transmission shaft to pump the cold water in the atmospheric pressure heat storage tank (5) out from the lower part of the tank at a higher pressure, and the cold water flows into the return pipe through the cold side pipe; It can be understood that when hot water flows from the water supply pipe into the atmospheric heat storage tank, a certain amount of throttling loss will be generated. The hot side impeller can recover the energy of this part of throttling loss. The hot side impeller is connected to the cold side impeller through a transmission shaft, converting the recovered energy into mechanical energy to drive the cold side impeller to work. The cold side impeller pressurizes the cold water at the bottom of the atmospheric heat storage tank and pumps it to the return pipe; S24, according to the pressure value set at the upper interface of the normal pressure heat storage tank (5) and the pressure target value set at the water return pipe, obtain the pressure signal of the third pressure signal acquisition terminal (17) and the pressure signal of the sixth pressure signal acquisition terminal (20) at the outlet of the sixth electric valve (14), and judge whether the pressure value at the upper interface of the normal pressure heat storage tank (5) and the pressure value at the water return pipe meet the standards. If they meet the standards, keep running until the normal pressure heat storage tank (5) completes heat storage, and enter step S1; S25. If the standard is not met, a hydraulic model of the system in the heat storage mode is established, and the target pressure value set at the upper interface of the atmospheric heat storage tank (5) and the target pressure value set at the return pipe are regulated by adjusting the electric regulating valve (8) in coordination with the hot side impeller (1) and the cold side impeller (2).

[0028] Among them, in step S3, when the heat network load is insufficient, the system switches to a heat release mode by receiving a superior dispatching signal through the analysis and decision module (22), establishes a hydraulic model of the system in the heat release mode, and regulates the pressure value set at the lower interface of the atmospheric heat storage tank (5) and the pressure target value set at the water supply pipe by the booster pump (3) in cooperation with the hot side impeller (1) and the cold side impeller (2), including the following steps: S31, the analysis and decision module (22) receives the upper-level dispatch signal and sends control information to the control module (23), and the system switches to the heat release mode; S32, the third electric valve (10), the fourth electric valve (12), the fifth electric valve (13), and the sixth electric valve (14) are opened, the first electric valve (7) and the second electric valve (9) are closed, and low-temperature water flows into the lower part of the normal pressure heat storage tank (5) through the cold side pipe and drives the cold side impeller (2); S33, the cold side impeller (2) recovers the throttling loss energy between the return pipe and the lower interface of the normal pressure heat storage tank (5), and at the same time, acts as a driving source to drive the hot cold side impeller (1) through the transmission shaft to pump the hot water in the normal pressure heat storage tank (5) out from the upper part of the tank at a boosting pressure. At the same time, the variable frequency motor (4) drives the booster pump (3) to continue to replenish the energy required for boosting, and the hot water flows into the water supply pipe through the hot side pipe; It can be understood that when cold water flows from the return pipe into the atmospheric pressure heat storage tank, a certain amount of throttling loss will be generated. The cold side impeller can recover the energy of this part of the throttling loss; the cold side impeller is connected to the hot side impeller through a transmission shaft, converts the recovered energy into mechanical energy, and drives the hot side impeller to work. The hot side impeller pressurizes the hot water at the top of the atmospheric pressure heat storage tank and pumps it to the water supply pipe. The variable frequency motor drives the booster pump to work, replenishes the energy required for boosting, and ensures that the hot water can be smoothly pumped to the water supply pipe; S34, according to the pressure value set at the lower interface of the normal pressure heat storage tank (5) and the pressure target value set at the water supply pipe, obtain the pressure signal of the fourth pressure signal acquisition terminal (18) and the pressure signal of the seventh pressure signal acquisition terminal (21) at the outlet of the booster pump (21), and judge whether the pressure value of the lower interface of the normal pressure heat storage tank (5) and the pressure value of the water supply pipe meet the standards. If they meet the standards, keep running until the normal pressure heat storage tank (5) finishes releasing heat, and enter step S1; S35. If the standard is not met, a hydraulic model of the system in the heat release mode is established, and the frequency conversion motor (4) and the booster pump (3) are adjusted to coordinate with the cold side impeller (2) and the hot side impeller (1) to adjust the pressure target value set at the lower interface of the atmospheric heat storage tank (5) and the pressure target value set at the water supply pipe.

[0029] Wherein, the hydraulic model of the system in the heat storage mode is established in step S25, including: According to the pressure-flow characteristic curve of the electric control valve (8), the simulation function V O =f(P1, P2, P up , P r ); Among them, V O is the valve opening, P1 is the pressure parameter collected by the first pressure signal collection terminal (15), P2 is the pressure parameter collected by the second pressure signal collection terminal (16), and P up is the preset target pressure value entering the upper part of the atmospheric pressure heat storage tank (5), P r It is the preset target pressure value entering the return pipe.

[0030] Wherein, the hydraulic model of the system in the heat release mode is established in step S35, including: According to the characteristic curve of the booster pump (3) and the power and voltage-frequency relationship of the variable frequency motor (4), a simulation function F=f(P2, P5, P down , P s ); Wherein, F is the voltage frequency of the variable frequency motor (4), P2 is the pressure parameter collected by the second pressure signal collection terminal (16), P5 is the pressure parameter collected by the fifth pressure signal collection terminal (19), and P downis the preset target pressure value entering the lower part of the atmospheric pressure heat storage tank (5), P s It is the preset target pressure value entering the water supply pipe.

[0031] In several embodiments provided in the present application, it should be understood that the disclosed system and method can also be implemented in other ways. The system embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and a part of the module, program segment or code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0032] In addition, the functional modules in each embodiment of the present invention can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part. If the function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), disk or optical disk and other media that can store program codes.

[0033] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A pressure matching system for a normal pressure heat storage tank, characterized in that: It includes: Normal pressure heat storage tank (5); A water supply hot side system, the water supply hot side system comprising a hot side pipe and a first electric valve (7), an electric regulating valve (8), a second electric valve (9), a hot side impeller (1), a third electric valve (10), a fourth electric valve (12), a booster pump (3), and a check valve (11) arranged on the hot side pipe, wherein the inlet of the first electric valve (7) is connected to the water supply pipe, and the outlet is connected to the inlet of the electric regulating valve (8), the outlet of the electric regulating valve (8) is connected to the inlet of the second electric valve (9), the outlet of the second electric valve (9) is connected to the inlet of the hot side impeller (1), the outlet of the hot side impeller (1) is connected to the inlet of the fourth electric valve (12), and the outlet of the fourth electric valve (12) is connected to the atmospheric pressure heat storage tank ( 5), the inlet of the third electric valve (10) is connected to the inlet of the hot side impeller (1), and the outlet is connected to the inlet of the booster pump (3), the outlet of the booster pump (3) is connected to the inlet of the check valve (11), and the outlet of the check valve (11) is connected to the water supply pipe, the outlet of the fourth electric valve (12) is provided with a third pressure signal acquisition terminal (17), the inlet of the hot side impeller (1) is provided with a second pressure signal acquisition terminal (16), the outlet of the first electric valve (7) is provided with a first pressure signal acquisition terminal (15), the outlet of the booster pump (3) is provided with a seventh pressure signal acquisition terminal (21), and the booster pump (3) is driven by a variable frequency motor (4); A return water cold side system, the return water cold side system comprising a cold side pipe and a fifth electric valve (13) arranged on the cold side pipe, a cold side impeller (2), and a sixth electric valve (14), the inlet of the sixth electric valve (14) being connected to the return water pipe, and the outlet being connected to the inlet of the cold side impeller (2), the outlet of the cold side impeller (2) being connected to the inlet of the fifth electric valve (13), the outlet of the fifth electric valve (13) being connected to the lower cold water side interface of the atmospheric pressure heat storage tank (5), the outlet of the fifth electric valve (13) being provided with a fourth pressure signal acquisition terminal (18), the inlet of the cold side impeller (2) being provided with a fifth pressure signal acquisition terminal (19), the inlet of the sixth electric valve (14) being provided with a sixth pressure signal acquisition terminal (20), and the cold side impeller (2) being connected to the hot side impeller (1) via a transmission shaft; An analysis and decision module (22), the analysis and decision module (22) being used to receive a dispatch signal from a host computer, collect output signals from a first pressure signal collection terminal (15), a second pressure signal collection terminal (16), a third pressure signal collection terminal (17), a fourth pressure signal collection terminal (18), a fifth pressure signal collection terminal (19), a sixth pressure signal collection terminal (20) and a seventh pressure signal collection terminal (21), comprehensively analyze the pressure difference between the water supply pipe and the upper hot water side of the normal pressure heat storage tank (5), and between the return pipe and the lower cold water side of the normal pressure heat storage tank (5), and send control information to the control module (23); A control module (23), the control module (23) being used to output control signals to the first electric valve (7), the second electric valve (9), the third electric valve (10), the fourth electric valve (12), the fifth electric valve (13), the sixth electric valve (14), the electric regulating valve (8), and the variable frequency motor (4), so as to control the switching states of the first electric valve (7), the second electric valve (9), the third electric valve (10), the fourth electric valve (12), the fifth electric valve (13), and the sixth electric valve (14), and to adjust the valve opening of the electric regulating valve (8) and the operating frequency of the variable frequency motor (4).

2. The pressure matching system of a normal pressure heat storage tank according to claim 1, characterized in that: The normal-pressure heat storage tank (5) is also provided with an air release valve (6) to ensure that the normal-pressure heat storage tank (5) is directly connected to the atmosphere.

3. A control method using a pressure matching system of a normal pressure heat storage tank as claimed in any one of claims 1 to 2, characterized in that: include: Step S1: When the heat network load is normal, the analysis and decision module (22) receives the upper dispatch signal and the system is not put into operation; Step S2: When the heat network load is sufficient, the system switches to the heat storage mode by receiving the upper dispatch signal through the analysis and decision module (22), establishes a hydraulic model of the system in the heat storage mode, and regulates the pressure value set at the upper interface of the normal pressure heat storage tank (5) and the pressure target value set at the return pipe by the electric regulating valve (8) in coordination with the hot side impeller (1) and the cold side impeller (2); Step S3, when the heat network load is insufficient, the system switches to a heat release mode by receiving a superior dispatching signal through the analysis and decision module (22), and establishes a hydraulic model of the system in the heat release mode. The booster pump (3) cooperates with the hot side impeller (1) and the cold side impeller (2) to regulate the pressure value set at the lower interface of the normal pressure heat storage tank (5) and the pressure target value set at the water supply pipe.

4. The control method of the pressure matching system of the atmospheric pressure heat storage tank according to claim 3 is characterized in that: In step S2, when the heat network load is sufficient, the system switches to a heat storage mode by receiving a superior dispatching signal through the analysis and decision module (22), establishes a hydraulic model of the system in the heat storage mode, and regulates the pressure value set at the upper interface of the normal pressure heat storage tank (5) and the pressure target value set at the return pipe through the electric regulating valve (8) in coordination with the hot side impeller (1) and the cold side impeller (2), including the following steps: S21, the analysis and decision module (22) receives the upper-level dispatch signal and sends control information to the control module (23), and the system switches to the heat storage mode; S22, the first electric valve (7), the second electric valve (9), the fourth electric valve (12), the fifth electric valve (13), and the sixth electric valve (14) are opened, the third electric valve (10) is closed, and the high-temperature water flows into the upper part of the atmospheric pressure heat storage tank (5) through the hot side pipe and drives the hot side impeller (1); S23, the hot side impeller (1) recovers the throttling loss energy between the water supply pipe and the upper interface of the atmospheric pressure heat storage tank (5), and at the same time acts as a driving source to drive the cold side impeller (2) through the transmission shaft to pump the cold water in the atmospheric pressure heat storage tank (5) out from the lower part of the tank at a higher pressure, and the cold water flows into the return pipe through the cold side pipe; S24, according to the pressure value set at the upper interface of the normal pressure heat storage tank (5) and the pressure target value set at the water return pipe, obtain the pressure signal of the third pressure signal acquisition terminal (17) and the pressure signal of the sixth pressure signal acquisition terminal (20) at the outlet of the sixth electric valve (14), and judge whether the pressure value at the upper interface of the normal pressure heat storage tank (5) and the pressure value at the water return pipe meet the standards. If they meet the standards, keep running until the normal pressure heat storage tank (5) completes heat storage, and enter step S1; S25. If the standard is not met, a hydraulic model of the system in the heat storage mode is established, and the target pressure value set at the upper interface of the atmospheric heat storage tank (5) and the target pressure value set at the return pipe are regulated by adjusting the electric regulating valve (8) in coordination with the hot side impeller (1) and the cold side impeller (2).

5. The control method of the pressure matching system of the atmospheric pressure heat storage tank according to claim 3 is characterized in that: In step S3, when the heat network load is insufficient, the system switches to a heat release mode by receiving a superior dispatching signal through the analysis and decision module (22), establishes a hydraulic model of the system in the heat release mode, and regulates the pressure value set at the lower interface of the atmospheric heat storage tank (5) and the pressure target value set at the water supply pipe by the booster pump (3) in cooperation with the hot side impeller (1) and the cold side impeller (2), including the following steps: S31, the analysis and decision module (22) receives the upper-level dispatch signal and sends control information to the control module (23), and the system switches to the heat release mode; S32, the third electric valve (10), the fourth electric valve (12), the fifth electric valve (13), and the sixth electric valve (14) are opened, the first electric valve (7) and the second electric valve (9) are closed, and low-temperature water flows into the lower part of the normal pressure heat storage tank (5) through the cold side pipe and drives the cold side impeller (2); S33, the cold side impeller (2) recovers the throttling loss energy between the return pipe and the lower interface of the normal pressure heat storage tank (5), and at the same time, acts as a driving source to drive the hot cold side impeller (1) through the transmission shaft to pump the hot water in the normal pressure heat storage tank (5) out from the upper part of the tank at a boosting pressure. At the same time, the variable frequency motor (4) drives the booster pump (3) to continue to replenish the energy required for boosting, and the hot water flows into the water supply pipe through the hot side pipe; S34, according to the pressure value set at the lower interface of the normal pressure heat storage tank (5) and the pressure target value set at the water supply pipe, obtain the pressure signal of the fourth pressure signal acquisition terminal (18) and the pressure signal of the seventh pressure signal acquisition terminal (21) at the outlet of the booster pump (21), and judge whether the pressure value of the lower interface of the normal pressure heat storage tank (5) and the pressure value of the water supply pipe meet the standards. If they meet the standards, keep running until the normal pressure heat storage tank (5) finishes releasing heat, and enter step S1; S35. If the standard is not met, a hydraulic model of the system in the heat release mode is established, and the frequency conversion motor (4) and the booster pump (3) are adjusted to coordinate with the cold side impeller (2) and the hot side impeller (1) to adjust the pressure target value set at the lower interface of the atmospheric heat storage tank (5) and the pressure target value set at the water supply pipe.

6. The control method of the pressure matching system of the atmospheric pressure heat storage tank according to claim 4 is characterized in that: The step S25 of establishing the hydraulic model of the system in the heat storage mode includes: According to the pressure-flow characteristic curve of the electric control valve (8), the simulation function V O =f(P1, P2, P up , P r ); Among them, V O is the valve opening, P1 is the pressure parameter collected by the first pressure signal collection terminal (15), P2 is the pressure parameter collected by the second pressure signal collection terminal (16), and P up is the preset target pressure value entering the upper part of the atmospheric pressure heat storage tank (5), P r It is the preset target pressure value entering the return pipe.

7. The control method of the pressure matching system of the atmospheric pressure heat storage tank according to claim 5 is characterized in that: The step S35 of establishing the hydraulic model of the system in the heat release mode includes: According to the characteristic curve of the booster pump (3) and the power and voltage-frequency relationship of the variable frequency motor (4), a simulation function F=f(P2, P5, P down , P s ); Wherein, F is the voltage frequency of the variable frequency motor (4), P2 is the pressure parameter collected by the second pressure signal collection terminal (16), P5 is the pressure parameter collected by the fifth pressure signal collection terminal (19), and P down is the preset target pressure value entering the lower part of the atmospheric pressure heat storage tank (5), P s It is the preset target pressure value entering the water supply pipe.

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