Power grid residual electricity heat storage recycling system

Abstract

The invention discloses a power grid residual electricity heat storage recycling system which comprises a heat storage water tank, an electrode heater, an evaporation container, a water supply pipeline, an evaporation pipeline, a water supply pump, a water return pump, a steam heater, a turboset, a power generation working machine and a condensation water tank. Desalted water is stored in the heat storage water tank; the electrode heater is used for heating the demineralized water; an evaporation pipeline is arranged in the evaporation container; the water supply pipeline is connected between the heat storage water tank and the evaporation pipeline; the water supply pump is arranged on the water supply pipeline; the steam heater is used for heating the evaporation pipeline; the turboset is connected with the evaporation pipeline; the condensation water tank is connected with the turboset and the heat storage water tank. According to the system, demineralized water is firstly heated through residual electricity of the power grid, redundant electric energy is converted into hot water to be stored, and when the hot water needs to be used, the hot water is slightly heated to become steam and pushes the steam turbine set to drive the power generation working machine to work, so that the residual electricity of the power grid can be stored and reused.

Description

Technical Field

[0001] The present invention relates to the field of electric energy recycling, and in particular to a power grid surplus electricity heat storage recycling system. Technical Background

[0002] At present, photovoltaic and wind power generation methods are affected by the unevenness of light and wind energy, so the amount of electricity generated and the voltage level are uncertain. The electricity generated by these power generation methods will be incorporated into the power grid for users to use, and the power grid mainly decides whether to accept the electricity from the above photovoltaic or wind power stations based on the power consumption of the user's demand side. In many periods of time, due to the fluctuation of power consumption at the user end, the power consumption is not fixed or unstable, which makes the power grid unable to accept the excessive electricity from the above power stations, resulting in the phenomenon of abandoning light and wind, which will make it impossible for the power station to operate continuously at full load, resulting in a significant reduction in the efficiency of the power station and serious waste of resources, which is not conducive to the realization of the dual carbon goals.

[0003] At present, the solution to the above problems is energy storage, which has the following methods: one is pumped energy storage, the principle of which is to use the excess electric energy that cannot enter the power grid to drive the water pump to pump water to the high reservoir, and convert the electric energy into the potential energy of water. When the power grid needs a large amount of electricity, the water in the reservoir is discharged to drive the turbine unit to generate electricity and supply the electricity end; the second is electrochemical energy storage, the principle of which is to temporarily store the excess power generation of the power grid by charging the battery, and then discharge the battery when needed; the third is compressed air energy storage, the principle of which is to let the excess electric energy drive the air pump, compress the air in the ultra-high pressure container, and when electricity is needed, the high-pressure air drives the gas turbine unit to generate electricity and supply the electricity end. In addition, there are other energy storage methods such as flywheel energy storage. However, the above-mentioned electric energy storage methods all have serious limitations and shortcomings. For example, pumped energy storage requires a site near the power station that meets the requirements of building a reservoir, and the engineering volume and cost are high. Most power stations do not have such conditions near them. For example, electrochemical energy storage requires a large number of battery packs, which are costly, and the charging and discharging life is limited, and the maintenance cost is high. Similarly, the other two energy storage methods have relatively high requirements, so they have been difficult to be widely used, so we will not go into details. Therefore, a new energy storage utilization method is needed. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a system for storing and reusing excess power from a power grid.

[0005] The technical solution of the present invention is as follows: A power grid surplus power heat storage and reuse system, which is characterized in that it includes:

[0006] A hot water storage tank, wherein desalted water is stored in the hot water storage tank;

[0007] An electrode heater is connected to an external power grid system and is used to heat the desalted water.

[0008] An evaporation container, wherein an evaporation pipeline is provided in the evaporation container;

[0009] a water supply pipe, the water supply pipe being connected between the hot water storage tank and the evaporation pipe and being in communication with the hot water storage tank and the evaporation pipe respectively;

[0010] A water supply pump, wherein the water supply pump is arranged on the water supply pipeline;

[0011] A steam heater, the steam heater is used to heat the evaporation pipe;

[0012] A steam turbine unit, wherein the steam turbine unit is connected to the evaporation pipeline;

[0013] A condensate water tank is connected to the steam turbine unit and the hot water storage tank respectively.

[0014] Furthermore, the shells of the hot water storage tank and the evaporation container are wrapped with a heat-insulating layer.

[0015] Furthermore, a water supply flow regulating valve is provided on the water supply pipeline.

[0016] Furthermore, the electrode heater includes a heating electrode, and the heating electrode is arranged in the hot water storage tank.

[0017] Furthermore, the evaporation pipe is structured in a spiral shape.

[0018] Furthermore, the evaporation pipe is arranged vertically, the inlet of the evaporation pipe is located below the evaporation container, and the exhaust port of the evaporation pipe is located above the evaporation container.

[0019] Compared with the prior art, the advantageous effects of the present invention are as follows:

[0020] This system heats the desalted water with the surplus electricity of the power grid, converts the surplus electricity into hot water and stores it. When it is needed, the hot water is slightly heated to turn it into steam and drive the steam turbine unit to drive the generator to work, thereby realizing the storage and reuse of the surplus electricity of the power grid. This system has a simple structure, large storage capacity, low construction cost, and can be installed near the power plant, which is suitable for promotion and application.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 Shown is a schematic diagram of an embodiment of the present invention;

[0024] Figure 2 Shown is a schematic diagram of another embodiment of the present invention.

[0025] Reference numerals:

[0026] 1-hot water storage tank; 2-electrode heater; 3-evaporation container; 4-water supply pipeline; 5-evaporation pipeline; 6-water supply pump; 7-water supply flow regulating valve; 8-insulation layer; 9-steam heater; 10-steam turbine unit; 11-generator working machine; 12-condensate tank; 13-safety valve; 14-return water pump; 15-return water flow regulating valve; 16-check valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but 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.

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. In the description of the present invention, it should be understood that the relationship between the orientations or positions indicated by the terms "front", "rear", "left", "right", "up", "down", "inside", "outside", "vertical", "axial", "radial", etc. is based on the relationship between the orientations or positions shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the present invention, unless otherwise clearly specified and limited, the terms such as "install", "connect", "connect", "fix" and the like should be understood in a broad sense, such as fixed connection, detachable connection or integrated connection; mechanical connection or electrical connection; direct connection, indirect connection or internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present invention, "first characteristic" and "second characteristic" may include one or more of the characteristics. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical characteristics. Therefore, the characteristics defined as "first" and "second" may explicitly or implicitly include one or more of the characteristics.

[0031] The following referenced drawings Figure 1 and Figure 2 A grid surplus power heat storage and reuse system according to an embodiment of the present invention is described, comprising: a hot water storage tank 1, an electrode heater 2, an evaporation container 3, a water supply pipeline 4, a water supply pump 6 and a steam heater 9.

[0032] like Figure 1 As shown, desalted water is stored in the hot water storage tank 1; the electrode heater 2 is connected to the external power grid system, and the electrode heater 2 is used to heat the desalted water; an evaporation pipe 5 is provided in the evaporation container 3; the water supply pipe 4 is connected between the hot water storage tank 1 and the evaporation pipe 5, and is communicated with the hot water storage tank 1 and the evaporation pipe 5 respectively; the water supply pump 6 is arranged on the water supply pipe 4; the steam heater 9 is used to heat the evaporation pipe 5; the steam turbine unit 10 is connected to the evaporation pipe 5; and the condensate tank 12 is connected to the steam turbine unit 10 and the hot water storage tank 1 respectively.

[0033] The working principle of this system is as follows: the excess electricity from the power grid is first used to heat the desalted water in the hot water storage tank 1 through the electrode heater 2, so that the excess electricity is first converted into thermal energy and stored; then, when needed, the high-temperature hot water is allowed to flow into the evaporation pipe 5 through the water supply pipe 4, and at the same time the steam heater 9 starts to work to heat the high-temperature hot water in the evaporation pipe 5 again, and finally forms high-temperature and high-pressure steam. After the steam flows into the steam turbine unit 10, it can drive the steam turbine unit 10 to work outward, and the condensed water and excess steam after the work are discharged from the steam turbine unit 10 and flow to the condensate tank 12 for temporary storage, and finally flow back to the hot water storage tank 1, completing a cycle of heat storage and reuse.

[0034] Specifically, the gas-liquid phase change material used in the system is desalted water. Since water has a relatively large specific heat capacity, it can absorb and store more energy, and it is low in cost, which can reduce the operating cost of the system. Of course, in addition to desalted water, other gas-liquid phase change materials can also be used, and the present invention does not limit the type of gas-liquid phase change material.

[0035] The hot water storage tank 1 is used to store desalted water. In order to reduce heat loss, a heat-insulating layer 8 is wrapped on the outer shell of the hot water storage tank 1. Furthermore, a water inlet is provided on the hot water storage tank 1 to add water during initial use or to replenish water when the water volume is reduced. A safety valve 13 can also be provided on the hot water storage tank 1 to prevent the pressure in the hot water storage tank 1 from being too high.

[0036] The electrode heater 2 is used to heat the desalted water. The electrode heater 2 is an electric heater so that it can be connected to the external power grid system to convert the surplus electricity into the thermal energy of the water. The present application does not limit the specific structural type and the number of settings of the electrode heater 2, and the specific scheme can be selected according to the needs. For example, the electrode heater 2 in this embodiment includes an electrode heater, and the electrode heater is arranged in the hot water storage tank 1. The electrode heater uses the water itself as a resistor to make it heat up by itself, and the heating effect is better. The arrangement of the electrodes is not limited here, and can be arranged horizontally or vertically.

[0037] The water supply pipe 4 is used to deliver the desalted water in the hot water storage tank 1 to the evaporation pipe 5, wherein a portion of the water supply pipe 4 extends into the hot water storage tank 1, the portion of the pipe is arranged vertically, and a plurality of water inlet holes arranged vertically are provided on the pipe, thereby allowing water at different heights to quickly flow into the water supply pipe 4 through the water inlet holes. In order to ensure that the desalted water can flow smoothly into the evaporation pipe 5, a water supply pump 6 is also provided to drive the flow of the desalted water, and the water supply pump 6 can also prevent the water and steam in the evaporation pipe 5 from flowing back into the hot water storage tank 1.

[0038] A water supply flow regulating valve 7 can also be set on the water supply pipe 4. The water supply flow regulating valve 7 can be a flow valve or a switch valve, etc., to achieve flow or on-off control of the water supply pipe 4. The specific type can be selected according to actual needs and is not limited here.

[0039] The evaporation container 3 is used to accommodate the evaporation pipe 5. In order to reduce the heat loss, the outer shell of the evaporation container 3 needs to be wrapped with a heat-insulating layer 8.

[0040] The steam heater 9 is used to heat the evaporation pipe 5 so that the high-temperature hot water can quickly form hot steam in the evaporation pipe 5. The steam heater 9 can be an electric heater, a gas heater, etc., which is not limited here.

[0041] The evaporation pipe 5 in this embodiment is configured in a spiral shape, which is beneficial to increase the contact area with the steam heater 9 and improve the heating effect. The spiral evaporation pipe 5 is arranged vertically, the inlet of the evaporation pipe 5 is located below the evaporation container, and the exhaust port of the evaporation pipe 5 is located above the evaporation container. Such an arrangement conforms to the principle of rising hot air flow and facilitates the discharge of steam.

[0042] It is understandable that the higher the temperature of the water in the hot water storage tank 1, the easier it is to turn into steam in the evaporation pipe 5, and the less energy will be consumed in the heating process of the steam heater 9. Therefore, the water in the hot water storage tank 1 can be heated to near the boiling point (this heating process can be one heating or multiple heatings) before being sent to the evaporation pipe 5. Therefore, a temperature sensor can be set in the hot water storage tank 1, and the temperature sensor is connected to the water supply pump 6. When the water temperature in the hot water storage tank 1 reaches the temperature preset by the temperature sensor, the water supply pump 6 is turned on to achieve automatic control.

[0043] The steam turbine unit 10 is used to perform external work. For example, the steam turbine unit 10 can be connected to a generator 11 to generate electricity, or connected to an electric motor to perform mechanical work.

[0044] The condensate tank 12 is used to collect condensed water and residual steam after work. The temperature of the condensed water and residual steam is relatively low after work. Therefore, after the hot water in the hot water storage tank 1 is used up, the condensate tank 12 can replenish the condensed water into the hot water storage tank 1 to avoid lowering the temperature of the hot water in the hot water storage tank 1 and affecting subsequent vaporization and evaporation.

[0045] Furthermore, the return water port of the hot water storage tank 1 is arranged at the bottom of the hot water storage tank 1, which is helpful to prevent the return water in the hot water storage tank 1 from mixing with the hot water at the top thereof, thereby lowering the temperature. A return water pump 14 and a return water flow regulating valve 15 may be arranged on the pipeline between the condensation water tank 12 and the hot water storage tank 1. The return water pump 14 is used to pump the condensation water into the hot water storage tank 1, and can also play a certain role in preventing backflow. The return water flow regulating valve 15 may be a flow valve or a switch valve, etc., to realize the control of the on-off or flow rate of the corresponding pipeline, etc. The specific type may be selected according to actual needs, and is not limited here.

[0046] In order to reduce heat loss, each connecting pipeline of the system can be wrapped with an insulation layer 8 according to actual conditions.

[0047] It should be noted that the present application does not limit the number of components such as the hot water storage tank 1, the evaporation container 3, the steam turbine unit 10 and the condensate tank 12, and the arrangement of each component can be selected according to actual needs. Figure 2There is one steam turbine unit 10 and one condensate tank 12, but there are multiple hot water storage tanks 1 and multiple evaporation containers 3, and the multiple hot water storage tanks 1 correspond to the multiple evaporation containers 3 one by one. The connection method between each hot water storage tank 1 and the corresponding evaporation container 3 is the same as above and will not be repeated.

[0048] The evaporation pipes 5 in the multiple evaporation containers 3 are connected in parallel to the steam turbine unit 10, and each evaporation pipe 5 is provided with a check valve 16, so that the steam can only flow into the steam turbine unit 10 in one direction, and will not flow into other evaporation pipes 5, so that each evaporation pipe 5 is independent of each other.

[0049] The water outlet of the condensate water tank 12 is provided with a main pipeline and multiple branch pipelines, the multiple branch pipelines are arranged in parallel and are connected to multiple hot water storage tanks 1 one by one, the main pipeline is provided with the above-mentioned return water pump 14, and each branch pipeline is provided with the above-mentioned return water flow regulating valve 15. At this time, the return water flow regulating valve 15 can be a switch valve, so that each hot water storage tank 1 is independent of each other and does not affect each other. The condensed water in the condensate water tank 12 can be discharged into only one hot water storage tank 1 or some hot water storage tanks 1 according to demand.

[0050] In this embodiment, the first group of hot water storage tanks 1 and evaporation containers 3 work first, and then the second group of hot water storage tanks 1 and evaporation containers 3 start working. At this time, the condensed water in the condensation water tank 12 can flow into the first group of hot water storage tanks 1 for water replenishment, and then proceed sequentially.

[0051] Of course, in addition to the above-mentioned embodiments, there may be other embodiments. For example, multiple hot water storage tanks 1 may be connected to one evaporation container 3, or one hot water storage tank 1 may be connected to multiple evaporation containers 3; multiple evaporation containers 3 may be connected to one steam turbine unit 10, or one evaporation container 3 may be connected to multiple steam turbine units 10; multiple steam turbine units 10 may be connected to one condensate tank 12, or one steam turbine unit 10 may be connected to multiple condensate tanks 12; multiple condensate tanks 12 may be connected to one hot water storage tank 1, or one condensate tank 12 may be connected to multiple hot water storage tanks 1. Therefore, the number of components such as the hot water storage tank 1, the evaporation container 3, the steam turbine unit 10, and the condensate tank 12, and the connection form adopted can be adaptively adjusted according to actual needs.

[0052] In summary, the system heats the desalted water with the surplus electricity of the power grid, converts the surplus electricity into hot water for storage, and then slightly heats the hot water to turn it into steam and drive the steam turbine unit 10 to work when it is needed, thereby realizing the storage and reuse of the surplus electricity of the power grid. The system has a simple structure, large storage capacity, low construction cost, can be installed near the power plant, and is suitable for promotion and application.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the claims and their equivalents.

Claims

1. A system for storing and reusing excess power from a power grid, the characteristics of which include: A hot water storage tank, wherein desalted water is stored in the hot water storage tank; An electrode heater, the electrode heater is connected to an external power grid system, and the electrode heater is used to heat the desalted water; An evaporation container, wherein an evaporation pipeline is provided in the evaporation container; a water supply pipe, the water supply pipe being connected between the hot water storage tank and the evaporation pipe and being in communication with the hot water storage tank and the evaporation pipe respectively; A water supply pump, wherein the water supply pump is arranged on the water supply pipeline; A steam heater, the steam heater is used to heat the evaporation pipe; A steam turbine unit, wherein the steam turbine unit is connected to the evaporation pipeline; A condensate tank, the condensate tank being connected to the steam turbine unit and the hot water storage tank respectively; A return water pump is connected to the condensate water tank and the hot water storage tank respectively.

2. The grid surplus electricity heat storage and reuse system according to claim 1 is characterized in that the outer shells of the hot water storage tank and the evaporation container are wrapped with an insulation layer.

3. The grid surplus electricity heat storage and reuse system according to claim 1 is characterized in that a water supply flow regulating valve is provided on the water supply pipeline.

4. The grid surplus electricity heat storage and reuse system according to claim 1, wherein the electrode heater comprises a heating electrode, and the heating electrode is arranged in the hot water storage tank.

5. The grid surplus electricity heat storage and reuse system according to claim 1, wherein the evaporation pipe is spirally structured.

6. The grid surplus power heat storage and reuse system according to claim 5 is characterized in that the evaporation pipe is arranged vertically, the inlet of the evaporation pipe is located below the evaporation container, and the exhaust port of the evaporation pipe is located above the evaporation container.

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