Cold and heat storage and release device and control method thereof

Abstract

The invention relates to a cold and heat storage and release device and a control method thereof. The cold and heat storage and release device is mainly composed of an energy storage tank, a circulating pump, an energy storage heat exchanger, an energy release heat exchanger, a plurality of electric valves, pipelines and a control system. The system is suitable for scenes with waste heat resources, such as a natural gas distributed generator set and the like, and can be cooperatively used with a solar heat collection device, an electric boiler and the like. By means of the system, the energy utilization rate of the heating and cooling system can be increased, peak load shifting of energy is achieved, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The invention relates to the field of heat exchange and energy storage equipment, and in particular to a cold and hot storage device and a control method thereof. Background Art

[0002] With the development of society and the advancement of science and technology, energy utilization and environmental protection have become the focus of global attention. Among them, the development and utilization of renewable energy such as solar energy and wind energy have received widespread attention. However, the randomness and instability of these energy sources have brought challenges to the balance of energy supply and demand. In order to solve this problem, energy storage technology came into being. Energy storage technology can effectively balance energy supply and demand, improve energy utilization, and reduce environmental pollution. As a new type of energy storage equipment, the cold and hot storage device has broad application prospects. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a cold and hot storage and discharge device, which has the advantages of wide application range, small footprint, skid-mountability, simple system and flexible control.

[0004] The purpose of the present invention is achieved through the following technical solutions: This cold and hot storage and discharge device is mainly composed of an energy storage tank, an energy storage heat exchanger, an energy discharging heat exchanger, a circulation pump, an electric regulating valve, an electric regulating valve, a plurality of electric valves, pipelines and a control system. The high-temperature medium pipe port and the low-temperature medium pipe port of the energy storage tank are both connected to the suction end of the circulation pump, and an electric valve and an electric valve are respectively arranged on the connecting pipelines of the two; the high-temperature medium pipe port and the low-temperature medium pipe port of the energy storage tank are respectively connected to the energy storage side outlet of the energy storage heat exchanger and the energy storage side outlet of the energy discharging heat exchanger, and an electric regulating valve and an electric valve are respectively arranged on the connecting pipelines of the two; the outlet end of the circulation pump is respectively connected to the energy storage side inlet of the energy storage heat exchanger and the energy storage side inlet of the energy discharging heat exchanger, and an electric valve and an electric valve are respectively arranged on the connecting pipelines of the two; the energy storage side outlet of the energy storage heat exchanger is respectively connected to the energy storage side inlet of the energy discharging heat exchanger and the low-temperature medium pipe port of the energy storage tank, and an electric valve and an electric regulating valve are respectively arranged on the connecting pipelines of the two. The high-temperature medium pipe port of the energy storage tank is communicated with the energy storage side outlet of the energy release heat exchanger, and an electric valve is arranged on the connecting pipeline between the two.

[0005] Specifically, the present invention relates to a cold and heat storage and discharge device, comprising an energy storage tank, an energy storage heat exchanger, an energy discharging heat exchanger and a circulation pump; the high-temperature medium pipe mouth of the energy storage tank is connected with the suction end of the circulation pump and the energy storage side outlet of the energy storage heat exchanger through an electric valve 1 and an electric regulating valve 2 respectively; the low-temperature medium pipe mouth of the energy storage tank is connected with the suction end of the circulation pump and the energy storage side outlet of the energy discharging heat exchanger through an electric valve 3 and an electric valve 4 respectively; the outlet end of the circulation pump is connected with the energy storage side inlet of the energy storage heat exchanger and the energy storage side inlet of the energy discharging heat exchanger through an electric valve respectively; the outlet end of the circulation pump is connected with the energy storage side inlet of the energy storage heat exchanger and the energy storage side inlet of the energy discharging heat exchanger through an electric valve 5 and an electric valve 6 respectively; the energy storage side outlet of the energy storage heat exchanger is connected with the energy storage side inlet of the energy discharging heat exchanger and the low-temperature medium pipe mouth of the energy storage tank through an electric valve 7 and an electric regulating valve 8 respectively; the high-temperature medium pipe mouth of the energy storage tank is connected with the energy storage side outlet of the energy discharging heat exchanger through an electric valve 9.

[0006] The present invention also includes a control system, which is a PLC system. The PLC system controls each electric valve to achieve conversion among heat storage conditions, heat release conditions, heat storage and heat release conditions, cold storage conditions, cold release conditions, or heat storage and cold release conditions.

[0007] The control system controls the opening and closing of the electric valve and the start and stop of the circulation pump according to the set working condition and its start and stop time, operating time, and the medium temperature in the energy storage tank (the circulation pump stops running when the rated maximum temperature or the rated minimum temperature is reached or exceeded, until the set start time of the next working condition is reached, and the control system automatically switches to the next working condition operation mode).

[0008] The energy storage tank is a heat storage tank or a cold storage tank.

[0009] The present invention also provides a control method for the above-mentioned cold and hot storage device, comprising: Heat storage condition: When the system is full of medium, start the circulation pump, open electric regulating valve 2, electric valve 3 and electric valve 5, close electric regulating valve 8, electric valve 1, electric valve 6, electric valve 7, electric valve 4 and electric valve 9, and the low-temperature medium at the bottom of the energy storage tank is transported to the energy storage heat exchanger for heat exchange, and the heated high-temperature medium is transported to the high-temperature medium pipe port of the energy storage tank. This cycle is repeated and heating is continued until the medium temperature in the energy storage tank reaches the rated maximum temperature or the set operating time of this condition is completed, and the heat storage process is completed.

[0010] Heat release condition: When the user side needs to use heat, start the circulation pump, open electric valve 1, electric valve 6 and electric valve 4, close electric regulating valve 2, electric regulating valve 8, electric valve 3, electric valve 7 and electric valve 9, and the high-temperature medium at the high-temperature medium pipe mouth of the energy storage tank is transported to the energy release heat exchanger for heat exchange, and the low-temperature medium after heat release is transported to the low-temperature medium pipe mouth of the energy storage tank. This cycle continues and heat is released continuously until the medium temperature in the energy storage tank drops to the rated minimum temperature or the set operating time of this condition is completed, and the heat release process is completed.

[0011] Heat storage and heat release working condition: start the circulation pump, open electric regulating valve 2, electric valve 3, electric valve 5, electric valve 7 and electric valve 9, close electric regulating valve 8, electric valve 1, electric valve 6 and electric valve 4, the low-temperature medium at the low-temperature medium pipe port of the energy storage tank is transported to the energy storage heat exchanger for heat exchange, the heated high-temperature medium is transported to the energy release heat exchanger for heat exchange, and the medium-temperature medium after heat release is transported to the high-temperature medium pipe port of the energy storage tank. This cycle is repeated and heat is continuously stored and released until the medium temperature in the energy storage tank reaches the rated maximum temperature or the set operating time of this working condition is completed, and the heat storage and heat release process is completed.

[0012] Cold storage condition: When the system is full of medium, start the circulation pump, open electric regulating valve 8, electric valve 1 and electric valve 5, close electric regulating valve 2, electric valve 3, electric valve 6, electric valve 7, electric valve 4 and electric valve 9, and the high-temperature medium at the high-temperature medium pipe port of the energy storage tank is transported to the energy storage heat exchanger for heat exchange, and the cooled low-temperature medium is transported to the low-temperature medium pipe port of the energy storage tank. This cycle is repeated and the temperature is continuously lowered until the medium temperature in the energy storage tank reaches the rated minimum temperature or the set operating time of this condition is completed, and the cold storage process is completed.

[0013] Cooling condition: When the user side needs to use cold capacity, start the circulation pump, open electric valve three, electric valve six and electric valve nine, close electric regulating valve two, electric regulating valve eight, electric valve one, electric valve seven and electric valve four, and the low-temperature medium at the low-temperature medium pipe mouth of the energy storage tank is transported to the energy release heat exchanger for heat exchange, and the high-temperature medium after absorbing heat is transported to the high-temperature medium pipe mouth of the energy storage tank. This cycle is repeated and cooling is continuously performed until the medium temperature in the energy storage tank rises to the rated maximum temperature or the set operating time of this condition is completed, and the cooling process is completed.

[0014] Storage and cooling working condition: start the circulation pump, open electric regulating valve eight, electric valve one, electric valve five, electric valve seven and electric valve four, close electric regulating valve two, electric valve three, electric valve six and electric valve nine, the high-temperature medium at the high-temperature medium pipe mouth of the energy storage tank is transported to the energy storage heat exchanger for heat exchange, the low-temperature medium after cooling is transported to the energy release heat exchanger for heat exchange, and the medium-temperature medium after absorbing heat is transported to the low-temperature medium pipe mouth of the energy storage tank. This cycle is repeated and storage and cooling are continuously performed until the medium temperature in the energy storage tank reaches the rated minimum temperature or the set operating time of this working condition is completed, and the storage and cooling process is completed.

[0015] The invention provides a heat and cold storage device, which has excellent heat storage and cold storage performance, can realize effective storage and release of heat, and improve energy utilization.

[0016] The cold and hot storage device of the present invention has the following advantages: Adopt excellent heat storage / cold storage medium, with good thermal stability and heat transfer performance, improve energy utilization; Compact structure, small footprint, easy to install and maintain; Intelligent control system to achieve real-time monitoring and adjustment of the heat storage / cold storage process to ensure safe and stable operation of the system; Can be combined with a variety of renewable energy systems to reduce energy costs and environmental pollution; It is applied in different fields and has broad application prospects. The cold and hot storage and discharge device can be combined with renewable energy systems such as solar energy and wind energy according to needs to achieve efficient use of energy. In addition, the cold and hot storage and discharge device can also be applied to industrial production, building energy conservation, electric vehicles and other fields, and has broad application prospects.

[0017] To sum up, this patent provides a cold and hot storage device with the advantages of high efficiency, environmental protection, and energy saving, and is suitable for various energy utilization scenarios.

[0018] The beneficial effects of this patent are: The system is simple, compact, skid-mounted, occupies a small area and has flexible layout.

[0019] It can be used in combination with a variety of heat source equipment and has a wide range of applications.

[0020] It is applicable to a variety of energy storage media.

[0021] One system can realize flexible switching among various working conditions.

[0022] The output energy can be adjusted by controlling the opening of the regulating valve and the flow of the circulating pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a system schematic diagram of the present invention.

[0024] Explanation of the reference numerals: energy storage tank 1, energy storage heat exchanger 2, energy release heat exchanger 3, circulation pump 4, electric regulating valve 5, electric regulating valve 6, and several electric valves 7-13. DETAILED DESCRIPTION

[0025] The following is a detailed introduction to this patent in conjunction with the accompanying drawings: Example: As shown in the attached Figure 1 As shown, this cold and hot storage and discharge device is mainly composed of an energy storage tank 1, an energy storage heat exchanger 2, an energy discharge heat exchanger 3, a circulation pump 4, an electric regulating valve 5, an electric regulating valve 6, a plurality of electric valves 7 to 13, and a pipeline and a control system. The high-temperature medium pipe port 101 and the low-temperature medium pipe port 102 of the energy storage tank 1 are both connected to the suction end of the circulation pump 4, and the connecting pipes of the two are respectively provided with electric valves 7 and electric valves 8; The other paths of the high-temperature medium pipe port 101 and the low-temperature medium pipe port 102 of the energy storage tank 1 are respectively connected to the energy storage side outlet 201 of the energy storage heat exchanger 2 and the energy storage side outlet 302 of the energy release heat exchanger 3, and the connecting pipelines of the two are respectively provided with an electric regulating valve 5 and an electric valve 12; The outlet end of the circulation pump 4 is respectively connected to the energy storage side inlet 202 of the energy storage heat exchanger 2 and the energy storage side inlet 301 of the energy release heat exchanger 3, and the connecting pipelines of the two are respectively provided with an electric valve 9 and an electric valve 10; The energy storage side outlet 201 of the energy storage heat exchanger 2 is connected to the energy storage side inlet 301 of the energy release heat exchanger 3 and the low-temperature medium pipe port 102 of the energy storage tank 1 respectively, and the connecting pipelines of the two are respectively provided with an electric valve 11 and an electric regulating valve 6.

[0026] The high temperature medium pipe port 101 of the energy storage tank 1 is communicated with the energy storage side outlet 302 of the energy release heat exchanger 3, and an electric valve 13 is provided on the connecting pipeline between the two.

[0027] As a further technical solution, the primary side inlet and outlet of the energy storage heat exchanger 2 are respectively connected to the flue gas waste heat system pipeline of the natural gas distributed generator set, which can be used to recover the flue gas waste heat resources and improve the energy utilization rate of the natural gas distributed generator set.

[0028] As a further technical solution, the primary inlet and outlet of the energy storage heat exchanger 2 are respectively connected to the electric boiler system pipeline, which can be used for the electric boiler to utilize valley electricity to store heat and reduce heating costs.

[0029] As a further technical solution, the inlet and outlet of the primary side of the energy storage heat exchanger 2 are respectively connected to the chilled water pipeline of the refrigeration unit, and can be used to store cold energy.

[0030] This system can be controlled by PLC system, and there are 6 main working conditions: Heat storage condition: When the system is full of medium, start the circulation pump 4, open the electric valves 5, 8, 9, close the electric valves 6, 7, 10, 11, 12, 13, and the low-temperature medium at the bottom of the energy storage tank 1 is transported to the energy storage heat exchanger 2 for heat exchange, and the heated high-temperature medium is transported to the upper pipe port 101 of the energy storage tank 1. This cycle is repeated and heating is continued until the medium temperature in the energy storage tank reaches the rated maximum temperature or the set operating time of this condition is completed, and the heat storage process is completed.

[0031] Heat release condition: When the user side needs to use heat, start the circulation pump 4, open the electric valves 7, 10, and 12, and close the electric valves 5, 6, 8, 11, and 13. The high-temperature medium in the upper part 101 of the energy storage tank 1 is transported to the energy release heat exchanger 3 for heat exchange, and the low-temperature medium after heat release is transported to the lower pipe port 102 of the energy storage tank 1. This cycle continues and heat is released continuously until the medium temperature in the energy storage tank drops to the rated minimum temperature or the set operating time of this condition is completed, and the heat release process is completed.

[0032] Heat storage and heat release working condition: This working condition is a combination of the above two working conditions. Heat is released and heat is exchanged while heating and heat storage is performed. Start the circulation pump 4, open the electric valves 5, 8, 9, 11, and 13, and close the electric valves 6, 7, 10, and 12. The low-temperature medium at the bottom of the energy storage tank 1 is transported to the energy storage heat exchanger 2 for heat exchange, and the heated high-temperature medium is transported to the energy release heat exchanger 3 for heat exchange. The medium-temperature medium after heat release is transported to the upper pipe port 101 of the energy storage tank 1. This cycle is repeated and heat is released while storing until the temperature of the medium in the energy storage tank reaches the rated maximum temperature or the set operating time of this working condition is completed. The heat storage and heat release flow rates are adjusted by adjusting the opening of the electric regulating valve 5 during the process.

[0033] Cold storage condition: When the system is full of medium, start the circulation pump 4, open the electric valves 6, 7, 9, close the electric valves 5, 8, 10, 11, 12, 13, and the high-temperature medium in the upper part of the energy storage tank 1 is transported to the energy storage heat exchanger 2 for heat exchange, and the cooled low-temperature medium is transported to the lower pipe port 102 of the energy storage tank 1. This cycle is repeated and the temperature is continuously reduced until the medium temperature in the energy storage tank reaches the rated minimum temperature or the set operating time of this condition is completed, and the cold storage process is completed.

[0034] Cooling condition: When the user side needs to use cold capacity, start the circulation pump 4, open the electric valves 8, 10, and 13, and close the electric valves 5, 6, 7, 11, and 12. The low-temperature medium in the lower part 102 of the energy storage tank 1 is transported to the energy-discharging heat exchanger 3 for heat exchange, and the high-temperature medium after absorbing heat is transported to the upper pipe port 101 of the energy storage tank 1. This cycle is repeated and cooling is continuously performed until the medium temperature in the energy storage tank rises to the rated maximum temperature or the set operating time of this condition is completed, and the cooling process is completed.

[0035] Storage and cooling working condition: start the circulation pump 4, open the electric valves 6, 7, 9, 11, 12, close the electric valves 5, 8, 10, 13, the high-temperature medium in the upper part of the energy storage tank 1 is transported to the energy storage heat exchanger 2 for heat exchange, the low-temperature medium after cooling is transported to the energy release heat exchanger 3 for heat exchange, and the medium-temperature medium after absorbing heat is transported to the lower pipe 102 of the energy storage tank 1, and the cycle is repeated and the storage and cooling is continuously performed until the medium temperature in the energy storage tank reaches the rated minimum temperature or the set operating time of this working condition is completed, and the storage and cooling process is completed. In the process, the flow of cold storage and cooling is adjusted by adjusting the opening of the electric regulating valve 6.

[0036] Each working condition is converted by controlling valves (switching type and regulating type) on different pipelines.

[0037] It should be clear that for those skilled in the art, any equivalent replacement or change to the technical solution and patent concept of this patent should be included in the protection scope of the claims attached to this patent.

Claims

1. A cold and hot storage device, characterized in that: The invention comprises an energy storage tank (1), an energy storage heat exchanger (2), an energy release heat exchanger (3) and a circulation pump (4); the high-temperature medium pipe port of the energy storage tank is connected to the circulation pump suction end and the energy storage side outlet of the energy storage heat exchanger through an electric valve 1 (7) and an electric regulating valve 2 (5); the low-temperature medium pipe port of the energy storage tank is connected to the circulation pump suction end and the energy storage side outlet of the energy release heat exchanger through an electric valve 3 (8) and an electric valve 4 (12); the outlet of the circulation pump is connected to the energy storage heat exchanger through an electric valve The side inlet of the energy storage side of the energy storage heat exchanger is connected to the energy storage side inlet of the energy storage heat exchanger; the outlet of the circulating pump is connected to the energy storage side inlet of the energy storage heat exchanger and the energy storage side inlet of the energy storage heat exchanger through the electric valve five (9) and the electric valve six (10) respectively; the energy storage side outlet of the energy storage heat exchanger is connected to the energy storage side inlet of the energy storage heat exchanger and the low-temperature medium pipe port of the energy storage tank through the electric valve seven (11) and the electric regulating valve eight (6) respectively; the high-temperature medium pipe port of the energy storage tank is connected to the energy storage side outlet of the energy storage heat exchanger through the electric valve nine (13).

2. The cold and heat storage device according to claim 1, characterized in that: It also includes a control system, which is a PLC system. The PLC system controls each electric valve to achieve conversion among heat storage condition, heat release condition, heat storage and heat release condition, cold storage condition, cold release condition or heat storage and cold release condition.

3. The cold and heat storage device according to claim 2, characterized in that: The control system controls the opening and closing of the electric valve and the starting and stopping of the circulation pump according to the set working conditions and their start and stop times, the running time, and the temperature of the medium in the energy storage tank.

4. The cold and heat storage device according to claim 1, characterized in that: The energy storage tank is a heat storage tank or a cold storage tank.

5. The control method of the cold and heat storage device according to any one of claims 1 to 4, comprising: Heat storage condition: when the system is full of medium, the circulation pump is started, the electric regulating valve 2 (5), the electric valve 3 (8) and the electric valve 5 (9) are opened, and the electric regulating valve 8 (6), the electric valve 1 (7), the electric valve 6 (10), the electric valve 7 (11), the electric valve 4 (12) and the electric valve 9 (13) are closed, and the low-temperature medium at the bottom of the energy storage tank (1) is transported to the energy storage heat exchanger (2) for heat exchange, and the heated high-temperature medium is transported to the high-temperature medium pipe port of the energy storage tank (1), and the cycle is repeated and the heating is continued until the temperature of the medium in the energy storage tank reaches the rated maximum temperature or the set operating time of the condition is completed, and the heat storage process is completed; Heat release condition: when the user side needs to use heat, the circulation pump (4) is started, the electric valve 1 (7), the electric valve 6 (10) and the electric valve 4 (12) are opened, the electric regulating valve 2 (5), the electric regulating valve 8 (6), the electric valve 3 (8), the electric valve 7 (11) and the electric valve 9 (13) are closed, and the high-temperature medium at the high-temperature medium pipe port of the energy storage tank (1) is transported to the energy release heat exchanger (3) for heat exchange, and the low-temperature medium after heat release is transported to the low-temperature medium pipe port of the energy storage tank (1). This cycle is repeated and heat release is continuously performed until the temperature of the medium in the energy storage tank drops to the rated minimum temperature or the set operating time of this condition is completed, and the heat release process is completed; Heat storage and heat release working condition: start the circulation pump (4), open the electric regulating valve 2 (5), electric valve 3 (8), electric valve 5 (9), electric valve 7 (11) and electric valve 9 (13), close the electric regulating valve 8 (6), electric valve 1 (7), electric valve 6 (10) and electric valve 4 (12), the low-temperature medium at the low-temperature medium pipe outlet of the energy storage tank (1) is transported to the energy storage heat exchanger (2) for heat exchange, the heated high-temperature medium is transported to the energy release heat exchanger (3) for heat exchange, and the medium-temperature medium after heat release is transported to the high-temperature medium pipe outlet of the energy storage tank (1), and the cycle is repeated and heat storage and heat release are continuously performed until the temperature of the medium in the energy storage tank reaches the rated maximum temperature or the set operating time of this working condition is completed, and the heat storage and heat release process is completed. During the process, the heat storage and heat release flow rates are adjusted by adjusting the opening of the electric regulating valve 2 (5); Cold storage condition: start the circulation pump (4), open the electric regulating valve eight (6), the electric valve one (7) and the electric valve five (9), close the electric regulating valve two (5), the electric valve three (8), the electric valve six (10), the electric valve seven (11), the electric valve four (12) and the electric valve nine (13), and the high-temperature medium at the high-temperature medium pipe port of the energy storage tank (1) is transported to the energy storage heat exchanger (2) for heat exchange, and the low-temperature medium after cooling is transported to the low-temperature medium pipe port of the energy storage tank (1), and the cycle is repeated and the temperature is continuously reduced until the temperature of the medium in the energy storage tank reaches the rated minimum temperature or the set operating time of the condition is completed, and the cold storage process is completed; Cooling condition: when the user side needs to use cold capacity, the circulation pump (4) is started, the electric valve three (8), the electric valve six (10) and the electric valve nine (13) are opened, the electric regulating valve two (5), the electric regulating valve eight (6), the electric valve one (7), the electric valve seven (11) and the electric valve four (12) are closed, and the low-temperature medium at the low-temperature medium pipe outlet of the energy storage tank (1) is transported to the energy-discharging heat exchanger (3) for heat exchange, and the high-temperature medium after absorbing heat is transported to the high-temperature medium pipe outlet of the energy storage tank (1), and the cycle is repeated and cooling is continuously performed until the medium temperature in the energy storage tank rises to the rated maximum temperature or the set operation time of this condition is completed, and the cooling process is completed; Storage and cooling working condition: start the circulation pump (4), open the electric regulating valve eight (6), electric valve one (7), electric valve five (9), electric valve seven (11) and electric valve four (12), close the electric regulating valve two (5), electric valve three (8), electric valve six (10) and electric valve nine (13), the high temperature medium at the high temperature medium pipe outlet of the energy storage tank (1) is transported to the energy storage heat exchanger (2) for heat exchange, the low temperature medium after cooling is transported to the energy release heat exchanger (3) for heat exchange, and the medium temperature medium after absorbing heat is transported to the low temperature medium pipe outlet of the energy storage tank (1), and the cycle is repeated and storage and cooling is continuously performed until the temperature of the medium in the energy storage tank reaches the rated minimum temperature or the set operation time of the working condition is completed, and the storage and cooling process is completed; during the process, the heat storage and heat release flow rates are adjusted by adjusting the opening of the electric regulating valve eight (6).

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