Cooling system for vacuum flywheel energy storage system and operation method

Abstract

The invention discloses a cooling system for a vacuum flywheel energy storage system and an operation method. The system comprises the flywheel energy storage system, a safety valve, a connecting pipeline, a condenser, an atomizing nozzle, a vacuum pump and a central control system. When the central control system detects that the temperature of the flywheel energy storage system is higher than a set value, fine water particles are used for cooling the flywheel running at a high speed, so that the temperature rise of the flywheel energy storage system is reduced, and the energy loss in the energy storage process is reduced; an atomizing nozzle of the system sprays out fine water particles in the running process of a flywheel, the water particles absorb heat to be evaporated into water vapor, the water vapor is absorbed by a vacuum pump and enters a condenser to be condensed into water flow, and the water flow set by a central control system enters the atomizing nozzle through a connecting pipeline and a safety valve to be atomized and sprayed out. Temperature rise of the flywheel energy storage system is reduced through water circulation, overtemperature of the flywheel energy storage system is prevented, and safe operation during flywheel energy storage is achieved. Friction of the flywheel energy storage system is reduced, and the energy storage effect of the flywheel energy storage system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and particularly relates to a cooling system and an operation method for a vacuum flywheel energy storage system. Background Art

[0002] With the continuous and stable development of renewable energy power generation, renewable energy has become the main body of newly installed capacity and newly generated electricity in China. However, due to the characteristics of randomness, intermittency, and volatility of renewable energy such as wind energy and solar energy, integrating renewable energy power generation into the power grid will affect the safe and stable operation of the power system. By using energy storage technology, the safety, flexibility, and utilization rate of renewable energy can be effectively improved. The flywheel energy storage system has many advantages such as high efficiency, short response time, large energy storage density, and long service life. The temperature during the operation of the flywheel energy storage system has a great impact on the performance of the flywheel: (1) The performance of the magnetic bearing is greatly affected by temperature. In severe cases, demagnetization will occur, losing the support effect and causing safety accidents; (2) The system components expand due to heat and generate friction, increasing losses; (3) When the temperature is too high, the monitoring effect is affected, reducing the system reliability and service life. In the flywheel energy storage system, when the vacuum degree is large, it will cause excessive losses in the flywheel energy storage system and affect the energy storage efficiency. When the vacuum degree is small, the rotor temperature rise will also affect the energy storage efficiency. Summary of the Invention

[0003] In order to reduce the influence of temperature rise on the flywheel energy storage system, the purpose of the present invention is to provide a cooling system and an operation method for a vacuum flywheel energy storage system. The present invention stabilizes the temperature of the flywheel energy storage system, reduces the friction loss of the flywheel energy storage system, improves the energy storage effect of the flywheel energy storage system, and is of great significance for improving the safety, stability, and energy storage capacity of the flywheel energy storage system.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A cooling system for a vacuum flywheel energy storage system, comprising a flywheel energy storage system 1, a vacuum pump 2, a condenser 3, a safety valve 4, an atomizing nozzle 5, a connecting pipe 6, and a central control system 7;

[0006] The flywheel energy storage system 1 is equipped with multiple sensors, which are controlled by the central control system 7 and feedback corresponding parameters; atomizing nozzles 5 are installed on the pipe wall of the flywheel energy storage system 1. The atomizing nozzles 5 are connected to the safety valve 4 through a connecting pipe 6. Both the safety valve 4 and the atomizing nozzles 5 are controlled by the central control system 7 and feedback corresponding parameters. The opening degree of the safety valve 4 is controlled by the central control system 7 to control the water flow rate. The water flows through the atomizing nozzles 5 for atomization treatment and sprays out fine water particles to cool the flywheel energy storage system 1; the vacuum pump 2 is respectively connected to the flywheel energy storage system 1, the condenser 3 and the central control system 7 through a connecting pipe 6. The vacuum pump 2 evacuates the flywheel energy storage system 1 to achieve a high vacuum degree and reduce air resistance, and absorbs the water vapor evaporated due to the absorption of heat by the fine water particles in the flywheel energy storage system 1 and discharges it into the condenser 3 for condensation into water to realize water circulation. The vacuum pump 2 is controlled by the central control system 7 and feedbacks corresponding parameters; the condenser 3 is connected to the safety valve 4 and the central control system 7 through a connecting pipe 6. The water flow rate condensed by the condenser 3 is controlled by the central control system 7 and feedbacks corresponding parameters.

[0007] The flywheel energy storage system 1, the vacuum pump 2, the condenser 3, the safety valve 4, and the atomizing nozzles 5 are all connected to the central control system 7, and transmit corresponding parameters to the central control system 7 respectively. The central control system 7 gives feedback control through the parameters.

[0008] The flywheel energy storage system 1 sets the temperature range according to requirements as -10°C to 40°C. The rotor operation area of the flywheel energy storage system 1 is evacuated by the vacuum pump 2 to maintain a high vacuum state.

[0009] For the operation method of the cooling system for the vacuum flywheel energy storage system, the adjustment process is the temperature rise and fall process of the flywheel energy storage system 1. When the temperature sensor in the flywheel energy storage system 1 detects that the temperature rises and deviates from the normal set range, it will transmit a signal to the central control system 7; the central control system 7 adjusts the operation states of each component according to the received signal, increases the opening degree of the safety valve 4 to increase the water flow rate. After detecting that the water vapor content in the flywheel energy storage system 1 increases, it increases the steam extraction capacity of the vacuum pump and improves the condensation effect of the condenser 3, and then gradually reduces the opening degree of the safety valve 4 to maintain the stable operation of the flywheel energy storage system.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] 1) Good cooling effect. The water flow is atomized into fine water particles by the atomizing nozzles 5 to absorb heat and cool down, and the effect is significantly better than other working media;

[0012] 2) High integration. Each functional module, component or subsystem in the same component of the present invention is compactly integrated together;

[0013] 3) Low cost. The system of the present invention has a simple working process, is easy to achieve automated operation and unattended operation, and has low subsequent operation and maintenance costs. Each component is a common component, and the direct material cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a system diagram of the present invention;

[0015] Figure 2 is Figure 1 a sectional view taken along the A-A direction. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0017] Working principle:

[0018] The cooling principle of the present invention is phase change cooling, that is, cooling is achieved through the cycle of water - water vapor - water, and its effect is much better than helium cycle cooling, water cooling, and air cooling. The water cycle adopted by the present invention reduces the operating cost and is environmentally friendly, has good cooling effect and prolongs the service life of the flywheel energy storage system.

[0019] As Figure 1 and Figure 2 shown, a cooling system for a vacuum flywheel energy storage system of the present invention includes a flywheel energy storage system 1, a vacuum pump 2, a condenser 3, a safety valve 4, an atomizing nozzle 5, a connecting pipe 6, and a central control system 7;

[0020] The flywheel energy storage system 1 is equipped with multiple sensors, which are controlled by the central control system 7 and feedback corresponding parameters to maintain the stability of the flywheel energy storage system; the atomizing nozzle 5 is installed on the pipe wall of the flywheel energy storage system 1, and the atomizing nozzle 5 is connected to the safety valve 4 through the connecting pipe 6. Both the safety valve 4 and the atomizing nozzle 5 are controlled by the central control system 7 and feedback corresponding parameters to maintain stability. The opening degree of the safety valve 4 is controlled by the central control system 7 to control the water flow rate. The water flows through the atomizing nozzle 5 for atomization treatment and sprays out fine water particles to cool the flywheel energy storage system 1; the vacuum pump 2 is connected to the flywheel energy storage system 1, the condenser 3, and the central control system 7 respectively through the connecting pipe 6. The vacuum pump 2 evacuates the flywheel energy storage system 1 to achieve a high vacuum degree to reduce air resistance, and absorbs the water vapor evaporated due to the absorption of heat by the fine water particles in the flywheel energy storage system 1 and discharges it into the condenser 3 for condensation into water to achieve water circulation. The vacuum pump 2 is controlled by the central control system 7 and feedbacks corresponding parameters; the condenser 3 is connected to the safety valve 4 and the central control system 7 through the connecting pipe 6. The water flow rate of the water condensed by the condenser 3 is controlled by the central control system 7 and feedbacks corresponding parameters.

[0021] The adjustment process of the present invention is the temperature rise and fall process of the flywheel energy storage system 1. When the temperature sensor in the flywheel energy storage system 1 detects that the temperature rises and deviates from the normal set range, it will transmit a signal to the central control system 7. The central control system 7 adjusts the operating states of each component according to the received signal, increases the opening degree of the safety valve 4 to increase the water flow rate. After detecting that the water vapor content in the flywheel energy storage system 1 increases, it increases the steam extraction capacity of the vacuum pump and improves the condensation effect of the condenser 3. Subsequently, it gradually reduces the opening degree of the safety valve 4 to maintain the stable operation of the flywheel energy storage system at -10°C to 40°C. During this process, the cooling system realizes the temperature control of the flywheel energy storage system and stabilizes the operation of the flywheel energy storage system.

[0022] When the central control system of the system of the present invention detects that the temperature of the flywheel energy storage system is higher than the set value, it uses fine water particles to cool the flywheel running at high speed, effectively reducing the temperature rise of the flywheel energy storage system and reducing the energy loss during the energy storage process; the atomizing nozzle of the system sprays fine water particles during the operation of the flywheel. The water particles absorb heat and evaporate into water vapor, which is absorbed by the vacuum pump and condensed into water flow in the condenser. The water flow set by the central control system enters the atomizing nozzle through the connecting pipe and the safety valve to be atomized and sprayed. The temperature rise of the flywheel energy storage system is reduced through water circulation, preventing the flywheel energy storage system from overheating and realizing safe operation during flywheel energy storage. The present invention reduces the friction of the flywheel energy storage system, improves the energy storage effect of the flywheel energy storage system, and is of great significance for improving energy utilization efficiency and increasing the energy storage capacity.

Claims

1. A cooling system for a vacuum flywheel energy storage system, characterized in that, It includes a flywheel energy storage system (1), a vacuum pump (2), a condenser (3), a safety valve (4), an atomizing nozzle (5), a connecting pipe (6), and a central control system (7); The flywheel energy storage system (1) is equipped with multiple sensors, which are controlled by the central control system (7) and feedback corresponding parameters; an atomizing nozzle (5) is installed on the pipe wall of the flywheel energy storage system (1), and the atomizing nozzle (5) is connected to the safety valve (4) through the connecting pipe (6). Both the safety valve (4) and the atomizing nozzle (5) are controlled by the central control system (7) and feedback corresponding parameters. The opening degree of the safety valve (4) is controlled by the central control system (7) to control the water flow rate. The water flows through the atomizing nozzle (5) for atomization treatment and sprays out fine water particles to cool the flywheel energy storage system (1); the vacuum pump (2) is respectively connected to the flywheel energy storage system (1), the condenser (3), and the central control system (7) through the connecting pipe (6). The vacuum pump (2) evacuates the flywheel energy storage system (1) to achieve a high vacuum degree to reduce air resistance, absorbs the water vapor evaporated due to the absorption of heat by the fine water particles in the flywheel energy storage system (1), and discharges it into the condenser (3) to be condensed into water to realize water circulation. The vacuum pump (2) is controlled by the central control system (7) and feedbacks corresponding parameters; the condenser (3) is connected to the safety valve (4) and the central control system (7) through the connecting pipe (6). The water flow rate of the water condensed by the condenser (3) is controlled by the central control system (7) and feedbacks corresponding parameters.

2. The cooling system for a vacuum flywheel energy storage system according to claim 1, characterized in that The flywheel energy storage system (1), the vacuum pump (2), the condenser (3), the safety valve (4), and the atomizing nozzle (5) are all connected to the central control system (7), and transmit corresponding parameters to the central control system (7), and the central control system (7) gives feedback control through the parameters.

3. A cooling system and operation method for a vacuum flywheel energy storage system according to claim 1, characterized in that, The flywheel energy storage system (1) sets the temperature range according to requirements as -10°C to 40°C, and the rotor operation area of the flywheel energy storage system (1) is evacuated by the vacuum pump (2) to maintain a high vacuum state.

4. The operating method of the cooling system for a vacuum flywheel energy storage system according to any one of claims 1 to 3, characterized in that: The adjustment process is the temperature rise and fall process of the flywheel energy storage system (1). When the temperature sensor in the flywheel energy storage system (1) detects that the temperature rises and deviates from the normal set range, it will transmit a signal to the central control system (7); the central control system (7) adjusts the operating states of each component according to the received signal, increases the opening degree of the safety valve (4) to increase the water flow rate. After detecting that the water vapor content in the flywheel energy storage system (1) increases, it increases the steam extraction capacity of the vacuum pump and improves the condensation effect of the condenser (3), and then gradually reduces the opening degree of the safety valve (4) to maintain the stable operation of the flywheel energy storage system.

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