Thermoelectric decoupling steam energy storage device

Abstract

The utility model relates to the technical field of thermal power generating units, in particular to a thermoelectric decoupling steam energy storage device, which not only greatly improves the flexibility and adaptability of a thermal power plant in electric power and heat supply markets and realizes the efficient utilization of energy, but also reduces the initial investment and operation and maintenance cost of the system compared with a fused salt energy storage system, and improves the energy utilization efficiency. The steam parameters can be adjusted in time, the stability and reliability of heat supply and power generation are guaranteed, the dynamic adjusting capacity of the cogeneration unit is improved, harmful substances cannot be generated in the whole energy storage and release process, and environment friendliness is achieved; comprising a steam supply mechanism; the system further comprises a steam energy storage mechanism and a mixing mechanism, the steam energy storage mechanism communicates with the steam supply mechanism and stores redundant heat energy, and the mixing mechanism communicates with the interiors of the steam energy storage mechanism and the steam supply mechanism and mixes the heat energy.

Description

Technical Field

[0001] This utility model relates to the technical field of thermal power units, and in particular to a thermoelectric decoupled steam energy storage device. Background Technology

[0002] Currently, combined heat and power (CHP) companies face numerous challenges due to changes in the electricity and heating markets. In the electricity market, the increasing volatility of grid load, especially with the large-scale integration of renewable energy sources such as wind and solar power, has resulted in a pronounced peak-valley characteristic in electricity supply. In the heating market, heating demand also exhibits seasonality and diurnal variations, making the need for energy storage systems for CHP companies increasingly urgent.

[0003] Existing thermoelectric decoupling steam energy storage devices, such as the invention patent application number 202211394416.7 which discloses a steam-coupled molten salt energy storage thermal power unit thermoelectric decoupling system and method, mainly include a power plant boiler, a cogeneration unit, a molten salt energy storage device, a high-pressure industrial steam supply pipe, and a low-pressure industrial steam supply pipe. The cogeneration unit includes a steam turbine unit. The power plant boiler is connected to the steam turbine unit and used to generate electricity. The exhaust port of the steam turbine unit is connected to the high-pressure industrial steam supply pipe, and the industrial extraction port of the steam turbine unit is connected to the low-pressure industrial steam supply pipe. In use, the corresponding valves are opened, and the feedwater from the deaerator enters the low-pressure steam generator and the high-pressure steam generator through the feedwater branch pipe. After being heated, steam with two different pressure parameters is generated. The steam output from the low-pressure steam generator then enters the low-pressure steam superheater and is heated to generate low-pressure superheated steam. Then, it is supplied to the outside through the low-pressure industrial steam supply pipe to meet the steam demand of low-pressure steam users.

[0004] Current combined heat and power (CHP) systems generally use molten salt energy storage systems. However, molten salt is corrosive and can cause corrosion to pipes, containers, and other equipment in the energy storage system during long-term operation. Moreover, molten salt energy storage systems have a relatively slow response speed and lack flexibility, making it impossible to effectively achieve dynamic regulation of heat and electricity decoupling. Utility Model Content

[0005] To address the aforementioned technical problems, this utility model provides a thermal power decoupled steam energy storage device that not only greatly improves the flexibility and adaptability of thermal power plants in the electricity and heating markets and achieves efficient energy utilization, but also reduces the initial investment and operation and maintenance costs of the system compared to molten salt energy storage systems. It can adjust steam parameters in a timely manner to ensure the stability and reliability of heating and power generation, improve the dynamic regulation capability of cogeneration units, and does not produce harmful substances during the entire energy storage and release process, making it environmentally friendly.

[0006] This utility model discloses a thermoelectric decoupled steam energy storage device, including a steam supply mechanism, a steam storage mechanism, and a mixing mechanism. The steam storage mechanism is connected to the steam supply mechanism and stores excess heat energy. The mixing mechanism is connected to both the steam storage mechanism and the steam supply mechanism and mixes the heat energy. During periods of low electricity demand, excess heat energy in the steam supply mechanism is converted into steam and stored in the steam storage mechanism. During periods of high electricity demand and high heating demand, the stored steam is directly transported to the mixing mechanism. The mixing mechanism mixes the heat generated by the steam storage mechanism and the steam supply mechanism for heating, greatly improving the flexibility and adaptability of the thermal power plant in the electricity and heating markets and achieving efficient energy utilization.

[0007] Preferably, the steam supply mechanism includes a waste heat boiler, a steam turbine, and a desuperheater / pressure reducer. The waste heat boiler is installed on the ground, the input end of the steam turbine is connected to the output end of the waste heat boiler, and the input end of the desuperheater / pressure reducer is connected to the output end of the waste heat boiler. The steam generated by the waste heat boiler is transported to the steam turbine for power generation. During off-peak electricity demand, a portion of the steam generated by the waste heat boiler is extracted into the desuperheater / pressure reducer for cooling and depressurization, thereby reducing the power generation capacity of the steam turbine. The cooled and depressurized steam in the desuperheater / pressure reducer is then transported to a steam energy storage mechanism for storage.

[0008] Preferably, the steam energy storage mechanism includes a steam accumulator, a water supply pipe, a condensate tank, and a drain pipe. The input end of the steam accumulator is connected to the output end of the desuperheater / pressure reducer, the output end of the water supply pipe is connected to the input end of the steam accumulator, the input end of the condensate tank is connected to the output end of the steam accumulator, and the input end of the drain pipe is connected to the output end of the steam accumulator. Steam enters the steam accumulator, and clean water is transported into the steam accumulator through the water supply pipe. Because the steam temperature is higher than the water temperature, the steam quickly condenses and releases heat, causing the water temperature inside the steam accumulator to rise. At the same time, the water level rises, and the saturated steam pressure in the corresponding steam space also increases. This process is called the charging process of the steam accumulator. During peak electricity and heating demand, the steam pressure generated by the waste heat boiler will decrease until it drops below the saturated pressure of the steam accumulator space. At this point, the saturated water in the steam accumulator becomes superheated water and will spontaneously flash evaporate and release heat. The secondary steam generated by the drop in water level is used to supplement the mixing mechanism. The condensate in the steam accumulator is discharged through the condensate tank. When maintenance is required, the drain pipe can be opened to discharge the sewage.

[0009] Preferably, the pipe between the steam accumulator and the desuperheater / pressure reducer is a charging pipe, and the pipe between the steam accumulator and the mixing mechanism is a discharging pipe. Both the discharging pipe and the charging pipe are equipped with check valves. By setting check valves, steam backflow is prevented, thus ensuring the charging and discharging effect of the steam accumulator.

[0010] Preferably, the mixing mechanism includes a steam superheater mixer, the input end of which is connected to the output end of both the waste heat boiler and the steam accumulator. When the temperature of the steam coming out of the steam accumulator may not meet the steam quality requirements of the subsequent steam turbine, the steam superheater mixer raises the steam temperature to a suitable level through heating or other means, giving the steam a higher enthalpy value and work capacity to meet the needs of efficient steam turbine operation. At the same time, the steam superheater mixer can also mix steam with different parameters, making the steam parameters uniform and stable. The system may contain steam from different sources, with different temperatures and pressures. The steam superheater mixer can fully mix these steams, ensuring that the temperature, pressure and other parameters of the output steam are stable within the set range, providing a stable and reliable steam source for subsequent steam consumption links, and ensuring the stability and reliability of the entire system operation.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: During periods of low electricity demand, excess heat energy in the steam supply mechanism is converted into steam and stored in the steam energy storage mechanism. During periods of high electricity demand and high heating demand, the stored steam is directly transported to the mixing mechanism. The mixing mechanism mixes the energy generated by the steam energy storage mechanism and the steam supply mechanism for heating, which greatly improves the flexibility and adaptability of the thermal power plant in the electricity and heating markets and realizes the efficient use of energy. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the steam supply mechanism of this utility model;

[0014] Figure 3 This is a schematic diagram of the steam energy storage mechanism of this utility model;

[0015] Figure 4 This is a schematic diagram of the structure of the hybrid mechanism of this utility model.

[0016] The attached diagram is labeled as follows: 01, Steam supply mechanism; 11, Waste heat boiler; 12, Steam turbine; 13, Desuperheater and pressure reducer; 02, Steam storage mechanism; 21, Steam accumulator; 22, Make-up water pipe; 23, Condensate tank; 24, Drain pipe; 03, Mixing mechanism; 31, Steam superheat mixer. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0018] Example 1

[0019] This utility model discloses a thermoelectric decoupled steam energy storage device, comprising a steam supply mechanism 01; it also includes a steam energy storage mechanism 02 and a mixing mechanism 03. The steam energy storage mechanism 02 is connected to the steam supply mechanism 01 and stores excess heat energy. The mixing mechanism 03 is internally connected to the steam energy storage mechanism 02 and the steam supply mechanism 01 and mixes the heat energy. The steam supply mechanism 01 includes a waste heat boiler 11, a steam turbine 12, and a desuperheater and pressure reducer 13. The waste heat boiler 11 is installed on the ground, and the input end of the steam turbine 12 is connected to the output end of the waste heat boiler 11. The input end of the desuperheating and pressure reducing device 13 is connected to the output end of the waste heat boiler 11; the steam energy storage mechanism 02 includes a steam accumulator 21, a water supply pipe 22, a condensate tank 23, and a drain pipe 24. The input end of the steam accumulator 21 is connected to the output end of the desuperheating and pressure reducing device 13, the output end of the water supply pipe 22 is connected to the input end of the steam accumulator 21, the input end of the condensate tank 23 is connected to the output end of the steam accumulator 21, and the input end of the drain pipe 24 is connected to the output end of the steam accumulator 21; during operation, the steam generated by the waste heat boiler 11 is delivered... The steam is fed into the steam turbine 12 for power generation. During off-peak electricity demand, some of the steam generated by the waste heat boiler 11 is extracted into the desuperheater and pressure reducer 13 for cooling and depressurization, thereby reducing the power generation capacity of the steam turbine 12. The cooled and depressurized steam in the desuperheater and pressure reducer 13 is then transported to the steam accumulator 21 for storage. As the steam enters the steam accumulator 21, clean water is transported into it through the water supply pipe 22. Because the steam temperature is higher than the water temperature, the steam rapidly condenses and releases heat, causing the water temperature in the steam accumulator 21 to rise, and the water level to rise accordingly. The saturated steam pressure in the steam space also increases. This process is called the charging process of the steam accumulator 21. During peak electricity and heating demand, the steam pressure generated by the waste heat boiler 11 will decrease until it drops below the saturated pressure of the steam accumulator 21. The saturated water in the steam accumulator 21 becomes superheated water and will automatically flash evaporate and release heat. The secondary steam generated by the drop in water level is used to supplement the supply to the mixing mechanism 03. The condensate in the steam accumulator 21 is discharged through the condensate tank 23. When maintenance is required, the sewage pipe 24 can be opened to discharge the sewage.

[0020] Example 2

[0021] like Figures 1 to 4As shown, this utility model discloses a thermoelectric decoupled steam energy storage device, based on embodiment 1; it further includes a charging pipe between the steam accumulator 21 and the desuperheating and pressure reducing device 13, and a dissipating pipe between the steam accumulator 21 and the mixing mechanism 03. Both the dissipating and charging pipes are equipped with check valves. The mixing mechanism 03 includes a steam superheat mixer 31, the input end of which is connected to both the output end of the waste heat boiler 11 and the output end of the steam accumulator 21. During operation, the steam generated by the waste heat boiler 11 is transported to the steam turbine 12 for power generation. During off-peak hours, a portion of the steam generated by the waste heat boiler 11 is extracted into the desuperheater and pressure reducer 13 for cooling and depressurization, thereby reducing the power generation capacity of the steam turbine 12. The cooled and depressurized steam in the desuperheater and pressure reducer 13 is then transported to the steam accumulator 21 for storage. As steam enters the steam accumulator 21, clean water is transported into it through the water supply pipe 22. Because the steam temperature is higher than the water temperature, the steam rapidly condenses and releases heat, causing the water temperature in the steam accumulator 21 to rise, and the water level to rise as well. Correspondingly, the saturated steam pressure in the steam space also increases. This process is called the charging process of the steam accumulator 21. During peak electricity and heating demand periods, the steam pressure generated by the waste heat boiler 11 will decrease. When it drops below the saturation pressure of the steam accumulator 21, the saturated water in the steam accumulator 21 becomes superheated water and will spontaneously flash-evaporate and release heat. The secondary steam generated by the drop in water level is used to supplement the mixing mechanism 03. Condensate in the steam accumulator 21 is discharged through the condensate tank 23. When maintenance is required, the drain pipe 24 can be opened to discharge wastewater. When the temperature of the steam exiting the steam accumulator 21 may not meet the steam quality requirements of the subsequent steam turbine 12, the steam superheat mixer 3... 1. By heating and other methods, the steam temperature is raised to a suitable level, giving the steam a higher enthalpy value and work capacity to meet the requirements of efficient operation of the steam turbine 12. At the same time, the steam superheat mixer 31 can also mix steam with different parameters to make the steam parameters uniform and stable. There may be steam from different sources, with different temperatures and pressures in the system. The steam superheat mixer 31 can fully mix these steams to ensure that the temperature, pressure and other parameters of the output steam are stable within the set range, providing a stable and reliable steam source for subsequent steam use links, and ensuring the stability and reliability of the entire system operation.

[0022] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A thermoelectrically decoupled steam energy storage device comprising a steam supply mechanism (01); characterized in that, The steam supply mechanism (01) comprises a waste heat boiler (11), a steam turbine (12) and a desuperheater (13), the waste heat boiler (11) is installed on the ground, the input end of the steam turbine (12) is connected with the output end of the waste heat boiler (11), and the input end of the desuperheater (13) is connected with the output end of the waste heat boiler (11).

2. A thermoelectrically decoupled vapor energy storage device as in claim 1, wherein, The steam supply mechanism (01) comprises a waste heat boiler (11), a steam turbine (12) and a desuperheater (13), the waste heat boiler (11) is installed on the ground, the input end of the steam turbine (12) is connected with the output end of the waste heat boiler (11), and the input end of the desuperheater (13) is connected with the output end of the waste heat boiler (11).

3. A thermoelectrically decoupled vapor energy storage device as in claim 2, wherein, The steam supply mechanism (01) comprises a waste heat boiler (11), a steam turbine (12) and a desuperheater (13), the waste heat boiler (11) is installed on the ground, the input end of the steam turbine (12) is connected with the output end of the waste heat boiler (11), and the input end of the desuperheater (13) is connected with the output end of the waste heat boiler (11).

4. A thermoelectrically decoupled vapor energy storage device as in claim 3, wherein, The pipeline between the steam accumulator (21) and the desuperheater (13) is a heat charging pipeline, the pipeline between the steam accumulator (21) and the mixing mechanism (03) is a heat releasing pipeline, and the heat charging pipeline and the heat releasing pipeline are both provided with check valves.

5. A thermoelectrically decoupled vapor energy storage device as in claim 3, wherein, The mixing mechanism (03) comprises a steam superheating mixer (31), and the input end of the steam superheating mixer (31) is communicated with the output end of the waste heat boiler (11) and the output end of the steam accumulator (21).

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