Heat energy storage power generation peak regulation system based on electric heating type solid heat storage equipment

Abstract

The utility model discloses a heat energy storage power generation peak shaving system based on electric heating type solid heat storage equipment. The steam input end of the steam turbine generator unit is connected with a steam output pipe of the electric heating type solid heat storage equipment, and the heat energy output end of the unit is connected with a municipal heating water supply pipe. The water return end of the unit is connected with the water outlet end of the heating system circulating pump, and the water inlet end of the heating system circulating pump is connected with a municipal heating water return pipe. The water outlet end of the heating system circulating pump is further connected with the water inlet end of the steam-water heat exchanger, and the water return end of the steam-water heat exchanger is connected with a municipal heating water supply pipe. The steam inlet end of the steam-water heat exchanger is connected with a heat storage equipment steam output pipe, and the water outlet end is connected with a heat storage equipment water supplementing pipe through a constant-pressure water supplementing pump. The system plays a role in power peak load shifting, and improves the stability and efficiency of a wind power project and a photoelectric project. Power grid pressure is reduced, and safe, stable and efficient operation of a power grid is guaranteed.

Description

Technical Field

[0001] The utility model relates to a thermal energy storage power generation peak regulation system based on solid heat storage equipment. Background Art

[0002] With the in-depth promotion of the new power system based on new energy, the new energy industry is ushering in a leapfrog development.

[0003] Shared energy storage has experienced rapid growth in recent years as an innovative business model for new energy storage. With its advantages of efficient dispatching, outstanding economic benefits, and sustainable operation paths, it has become a key path to promoting the high-quality development of new energy storage and distribution.

[0004] Existing energy storage and peak-shaving systems mostly use electrochemical (battery) energy storage. Battery systems are expensive, have a short service life, a short energy storage time, and a single energy storage output medium. They cannot meet long-term energy storage and peak-shaving needs and users' diverse energy needs. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a thermal energy storage power generation peak-shaving system based on an electrically heated solid thermal storage device, which plays the role of peak-shifting and valley-filling electricity, and realizes the on-site consumption of wind power and photovoltaic power; the system has multiple functions such as power generation, heat supply, and steam supply, so as to meet the long-term energy storage peak-shaving and various energy needs of users.

[0006] The technical solution of the utility model is as follows:

[0007] The thermal energy storage power generation peak regulation system based on the electrically heated solid heat storage device, the electrically heated solid heat storage device comprises a heat storage tank with an air outlet and a return air outlet, a heat storage body is installed inside the heat storage tank, an electric heater is installed inside the heat storage body, a steam generator, a fan and a steam drum are also installed outside the heat storage tank; the air inlet end of the steam generator is connected to the air outlet, the air outlet end is connected to the air inlet end of the fan, and the air outlet end of the fan is connected to the return air outlet; the water inlet end of the steam generator is connected to the water supply pipe of the heat storage device, the steam output end is connected to the air inlet end of the steam drum, and the air outlet end of the steam drum is connected to the steam output pipe of the heat storage device; the system also comprises a steam turbine generator set, a heating system circulation pump, Steam-water heat exchanger and constant-pressure make-up water pump; the steam input end of the steam turbine generator set is connected to the steam output pipe of the heat storage equipment, and the heat energy output end of the steam turbine generator set is connected to the municipal heating water supply pipe; the return water end of the steam turbine generator set is connected to the water outlet end of the heating system circulation pump, and the water inlet end of the heating system circulation pump is connected to the municipal heating return water pipe; the water outlet end of the heating system circulation pump is also connected to the water inlet end of the steam-water heat exchanger, and the return water end of the steam-water heat exchanger is connected to the municipal heating water supply pipe; the steam inlet end of the steam-water heat exchanger is connected to the steam output pipe of the heat storage equipment, the water outlet end of the steam-water heat exchanger is connected to the water inlet end of the constant-pressure make-up water pump, and the water outlet end of the constant-pressure make-up water pump is connected to the heat storage equipment make-up water pipe.

[0008] Preferably, the system further comprises an industrial steam external supply pipe connected to the steam output pipe of the thermal storage equipment.

[0009] Preferably, the steam turbine generator set is also provided with a high voltage power output terminal.

[0010] Preferably, the system further comprises a water supply subsystem; the water supply subsystem comprises a softened water treatment device, a softened water tank, a thermal deaerator water supply pump and a thermal deaerator connected in sequence; the thermal deaerator is connected by

[0011] The deaerator outlet pipe is connected to the constant pressure water supply pump; wherein, the water inlet end of the softening water treatment equipment is used to connect to the municipal tap water pipe, and the thermal deaerator is connected to the steam output pipe of the heat storage equipment.

[0012] Further preferably, a condensate recovery pipe is connected between the steam turbine generator set and the softened water tank.

[0013] Preferably, the steam turbine generator set adopts a back-pressure steam turbine.

[0014] Preferably, the fan is a high-temperature resistant variable-frequency fan.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] First, the system of this utility model plays the role of peak-load shifting and valley-loading, consuming clean green electricity locally, improving the stability and efficiency of wind power and photovoltaic projects; reducing the pressure on the power grid, and ensuring the safe, stable, and efficient operation of the power grid. It can meet the needs of long-term energy storage peak load regulation and users' various energy needs.

[0017] Second, the electric heating solid thermal storage equipment of this system uses 35kV high voltage electricity for direct input, which can effectively reduce the investment cost of the power distribution system; the electric heating solid thermal storage equipment can release heat to generate electricity, supply heat, and supply steam during non-off-peak hours, and can also operate while storing and releasing heat throughout the day.

[0018] Third, the system's steam turbine generator set uses saturated steam to generate electricity. The preferred steam turbine generator is a back-pressure steam turbine, which provides both power to drive the generator and heat for production or domestic use, resulting in high thermal energy utilization. Furthermore, the selected steam turbine generator is adaptable to the requirements of the solid thermal storage equipment and the project's operating conditions, enabling frequent and rapid turbine starts and stops, as well as variable operating conditions. The turbine quickly heats up and enters operation under startup conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure and workflow of an embodiment of the thermal energy storage power generation peak regulation system of the present utility model.

[0020] Figure 2 This is a schematic structural diagram of an electrically heated solid thermal storage device in an embodiment of the present utility model.

[0021] Description of reference numerals:

[0022] 1. Electric-heated solid thermal storage device, 1-1. Thermal storage body, 1-2. Electric heater, 1-3. Steam generator, 1-4. Fan, 1-5. Steam drum, 1-6. Insulation structure, 1-7. High-voltage distribution cabinet, 1-8. Thermal storage tank, 1-9. Thermal storage device water supply pipe, 1-10. Thermal storage device steam output pipe, 2. Industrial steam external supply pipe, 2-1. First valve, 3. Steam turbine generator set, 3-1. High-voltage output terminal, 3-2. Unit steam inlet pipe, 3-2-1. Second valve, 3-3. Condensate recovery pipe, 3-3-1. Third valve, 3-4. Unit return pipe, 3-4-1. Fourth valve, 3-5. Unit heating pipe, 3-5-1. Fifth valve , 4. Municipal heating water supply pipe, 5. Municipal heating return pipe, 6. Heating system circulation pump, 7. Steam-water heat exchanger, 7-1, heat exchanger inlet pipe, 7-1-1, sixth valve, 7-2, heat exchanger outlet pipe, 7-2-1, seventh valve, 7-3, heat exchanger steam inlet pipe, 7-3-1, eighth valve, 7-4, heat exchanger return pipe, 7-4-1, ninth valve, 8. Municipal tap water pipe, 9. Softened water treatment equipment, 10. Softened water tank, 11. Thermal deaerator feed water pump, 12. Thermal deaerator, 12-1, deaerator steam inlet pipe, 12-1-1, tenth valve, 12-2, deaerator outlet pipe, 12-2-1, eleventh valve, 13. Constant pressure water pump. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 As shown, the embodiment of the thermal energy storage power generation peak regulation system of the present invention includes an electrically heated solid heat storage device 1. Figure 2The electrically heated solid heat storage device 1 includes a heat storage tank 1-8 having an air outlet and a return air outlet. The heat storage tank 1-8 has an insulation layer 1-6 installed on its walls and a heat storage body 1-1 (e.g., heat storage bricks) installed inside. An electric heater 1-2 (e.g., a heating wire) is installed inside the heat storage body 1-1. The heat storage tank 1-8 has an air circulation channel. A high-voltage distribution cabinet 1-7 (a 35kV high-voltage distribution cabinet in this embodiment) is installed outside the heat storage tank 1-8. This cabinet is used to connect the electric heater 1-2 to the power grid and control the power supply to the electric heater 1-2. A steam generator 1-3, a fan 1-4, and a steam drum 1-5 are also installed outside the heat storage tank 1-8. The air inlet of the steam generator 1-3 is connected to the air outlet, the air outlet is connected to the air inlet of the fan 1-4, and the air outlet of the fan 1-4 is connected to the return air outlet. The water inlet end of the steam generator 1-3 is connected to the heat storage device water supply pipe 1-9, the steam output end is connected to the air inlet end of the steam drum 1-5, and the air outlet end of the steam drum 1-5 is connected to the heat storage device steam output pipe 1-10.

[0025] In this embodiment, the electrically heated solid thermal storage device 1 is directly connected with a high voltage of 35 kV; the steam drums 1-5 generate 1.6 MPa saturated steam.

[0026] Still Figure 1The thermal energy storage power generation peak-shaving system embodiment of the present invention also includes a steam turbine generator set 3, a heating system circulating pump 6, a steam-water heat exchanger 7, and a constant-pressure make-up water pump 13. The steam input end of the steam turbine generator set 3 is connected to the thermal storage device steam output pipe 1-10 via the unit steam inlet pipe 3-2 with a second valve 3-2-1. The heat energy output end of the steam turbine generator set 3 is connected to the municipal heating water supply pipe 4 via the unit heat supply pipe 3-5 with a fifth valve 3-5-1. The return water end of the steam turbine generator set 3 is connected to the water outlet end of the heating system circulating pump 6 via the unit return water pipe 3-4 with a fourth valve 3-4-1. The water inlet end of the heating system circulating pump 6 is connected to the municipal heating return water pipe 5. The water outlet of the heating system circulation pump 6 is also connected to the water inlet of the steam-water heat exchanger 7 via a heat exchanger inlet pipe 7-1 with a sixth valve 7-1-1. The return water of the steam-water heat exchanger 7 is connected to the municipal heating water supply pipe 4 via a heat exchanger return pipe 7-4 with a ninth valve 7-4-1. The steam inlet of the steam-water heat exchanger 7 is connected to the thermal storage device steam output pipe 1-10 via a heat exchanger steam inlet pipe 7-3 with an eighth valve 7-3-1. The water outlet of the steam-water heat exchanger 7 is connected to the water inlet of the constant-pressure make-up pump 13 via a heat exchanger outlet pipe 7-2 with a seventh valve 7-2-1. The water outlet of the constant-pressure make-up pump 13 is connected to the thermal storage device make-up pipe 1-9. The water in the municipal heating return pipe 5 enters the steam-water heat exchanger 7 through the heat exchanger inlet pipe 7-1, and returns to the municipal heating water supply pipe 4 through the heat exchanger return pipe 7-4 after heat exchange; the saturated steam provided by the heat storage device steam output pipe 1-10 enters the steam-water heat exchanger 7 through the heat exchanger steam inlet pipe 7-3, is condensed into water after heat exchange, and then returns to the electrically heated solid thermal storage device 1 through the heat exchanger outlet pipe 7-2.

[0027] The thermal energy storage power generation peak-shaving system embodiment of the present invention further includes an industrial steam external supply pipe 2 with a first valve 2-1, and the industrial steam external supply pipe 2 is connected to the steam output pipe 1-10 of the thermal storage equipment.

[0028] The steam turbine generator set 3 is also provided with a high voltage power output terminal 3-1 for supplying power to the outside of the system.

[0029] To ensure safe and stable operation, the system also includes a water replenishment subsystem. This replenishment subsystem comprises a softened water treatment device 9, a softened water tank 10, a thermal deaerator replenishment pump 11, and a thermal deaerator 12, all connected in sequence. The thermal deaerator 12 is connected to the water inlet of the constant-pressure replenishment pump 13 via a deaerator outlet pipe 12-2 equipped with an eleventh valve 12-2-1. The water inlet of the softened water treatment device 9 is connected to the municipal water pipe 8, and the thermal deaerator 12 is connected to the thermal storage device steam output pipe 1-10 via a deaerator steam inlet pipe 12-1, which is equipped with a tenth valve 12-1-1.

[0030] In order to recycle the condensed water produced by the steam turbine generator set 3, a condensate recovery pipe 3-3 with a third valve 3-3-1 is connected between the steam turbine generator set 3 and the softened water tank 10. The condensed water produced by the condenser of the steam turbine generator set 3 flows into the softened water tank 10 for reuse.

[0031] The steam turbine generator set 3 used in this embodiment adopts a back-pressure steam turbine, which not only provides power to drive the generator, but also provides heat for production or living.

[0032] During the off-peak period of the power grid preset for the thermal storage device, the power switch is turned on through the automatic control system of the high-voltage distribution cabinet 1-7, and the power grid supplies power to the electric heater 1-2, which heats the thermal storage body 1-1. The electric heater 1-2 converts electrical energy into thermal energy, which is stored in the thermal storage body 1-1. When the temperature of the thermal storage body 1-1 reaches the set upper temperature limit or the off-peak period of the power grid ends, the automatic control system of the high-voltage distribution cabinet 1-7 turns off the power switch, completing the thermal storage process. During off-peak periods or periods when electricity and heat are needed, the high-temperature resistant variable frequency fan 1-4 is started, and the fan 1-4 drives the high-temperature hot air in the thermal storage tank 1-8 to circulate, transporting the stored heat to the steam generator 1-3. The high-temperature wet steam generated by the steam generator 1-3 is then separated into high-temperature saturated steam through the steam drum 1-5 and output through the steam output pipe 1-10 of the thermal storage device.

[0033] The high-temperature saturated steam generated by the electrically heated solid thermal storage device 1 drives the steam turbine generator set 3 to generate secondary electricity. The steam turbine generator set 3 outputs high-voltage electricity with a voltage level of 10kV through its high-voltage power output terminal 3-1 for users to use.

[0034] Waste heat from power generation provides a heat source for heating users. Specifically, steam from the steam turbine generator set 3 is delivered to the municipal heating water supply pipe 4 via the unit heat supply pipe 3-5. A portion of the steam output from the thermal storage device steam output pipe 1-10 enters the steam-water heat exchanger 7 via the heat exchanger steam inlet pipe 7-3. After heat exchange, it is transported through the heat exchanger return pipe 7-4 to the municipal heating water supply pipe 4. After passing through the heating system circulation pump 6, a portion of the steam from the municipal heating return pipe 5 returns to the steam turbine generator set 3 via the unit return pipe 3-4, while the remaining portion enters the steam-water heat exchanger 7. After heat exchange, it returns to the municipal heating water supply pipe 4 via the heat exchanger return pipe 7-4. Heat exchange through the steam-water heat exchanger 7 supplements the heat source required by heating users to meet the shortfall in waste heat from power generation. Saturated steam provided by the thermal storage device steam output pipe 1-10 enters the steam-water heat exchanger 7 via the heat exchanger steam inlet pipe 7-3. After heat exchange, it is condensed into water and then returned to the electrically heated solid thermal storage device 1 via the heat exchanger outlet pipe 7-2.

[0035] The high-temperature saturated steam generated by the electrically heated solid thermal storage device 1 can also be output through the industrial steam external supply pipe 2 for user use.

Claims

1. A thermal energy storage power generation peak-shaving system based on an electrically heated solid thermal storage device, the electrically heated solid thermal storage device comprising a thermal storage tank (1-8) having an air outlet and an air return port, a thermal storage body (1-1) installed inside the thermal storage tank (1-8), and an electric heater (1-2) installed inside the thermal storage body (1-1), characterized in that: A steam generator (1-3), a fan (1-4) and a steam drum (1-5) are also installed outside the heat storage tank (1-8); the air inlet end of the steam generator (1-3) is connected to the air outlet, the air outlet end is connected to the air inlet end of the fan (1-4), and the air outlet end of the fan (1-4) is connected to the return air outlet; the water inlet end of the steam generator (1-3) is connected to the heat storage device water supply pipe (1-9), the steam output end is connected to the air inlet end of the steam drum (1-5), and the air outlet end of the steam drum (1-5) is connected to the heat storage device steam output pipe (1-10); the system also includes a steam turbine generator set (3), a heating system circulating pump (6), a steam-water heat exchanger (7) and a constant pressure water supply pump (13); the steam input end of the steam turbine generator set (3) is connected to the heat storage device A steam output pipe (1-10) is provided, and the heat energy output end of the steam turbine generator set (3) is connected to the municipal heating water supply pipe (4); the return water end of the steam turbine generator set (3) is connected to the water outlet end of the heating system circulation pump (6), and the water inlet end of the heating system circulation pump (6) is connected to the municipal heating return water pipe (5); the water outlet end of the heating system circulation pump (6) is also connected to the water inlet end of the steam-water heat exchanger (7), and the return water end of the steam-water heat exchanger (7) is connected to the municipal heating water supply pipe (4); the steam inlet end of the steam-water heat exchanger (7) is connected to the steam output pipe (1-10) of the heat storage device, the water outlet end of the steam-water heat exchanger (7) is connected to the water inlet end of the constant pressure water supply pump (13), and the water outlet end of the constant pressure water supply pump (13) is connected to the heat storage device water supply pipe (1-9).

2. The thermal energy storage power generation peak-shaving system based on the electrically heated solid thermal storage device according to claim 1, characterized in that: The system further comprises an industrial steam external supply pipe (2) connected to the steam output pipe (1-10) of the heat storage equipment.

3. The thermal energy storage power generation peak-shaving system based on the electrically heated solid thermal storage device according to claim 1, characterized in that: The steam turbine generator set (3) is also provided with a high-voltage power output terminal (3-1).

4. The thermal energy storage power generation peak-shaving system based on the electrically heated solid thermal storage device according to claim 1, 2 or 3, characterized in that: The system further comprises a water supply subsystem; the water supply subsystem comprises a softened water treatment device (9), a softened water tank (10), a thermal deaerator water supply pump (11) and a thermal deaerator (12) connected in sequence; the thermal deaerator (12) is connected to the constant pressure water supply pump (13) via a deaerator outlet pipe (12-2); wherein the water inlet end of the softened water treatment device (9) is used to connect to the municipal tap water. The water pipe (8) and the thermal deaerator (12) are connected to the steam output pipe (1-10) of the thermal storage device.

5. The thermal energy storage power generation peak regulation system based on the electrically heated solid thermal storage device according to claim 4, characterized in that: A condensate recovery pipe (3-3) is connected between the steam turbine generator set (3) and the softened water tank (10).

6. The thermal energy storage power generation peak regulation system based on the electrically heated solid thermal storage device according to claim 1, 2 or 3, characterized in that: The steam turbine generator set (3) adopts a back-pressure steam turbine.

7. The thermal energy storage power generation peak-shaving system based on the electrically heated solid thermal storage device according to claim 1, 2 or 3, characterized in that: The fans (1-4) are high-temperature resistant variable-frequency fans.

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