A multi-purpose energy storage peak-shaving power generation system

Abstract

The application discloses a multipurpose energy storage peak shaving power generation system, which comprises a generator unit, an energy storage assembly and an energy release assembly. The generator unit is provided with a reheat steam output end and a condensate water output end. The energy storage assembly is provided with a reheat steam input end and a power output end. The reheat steam output end is connected with the reheat steam input end through a pipeline. The energy release assembly comprises an electrolytic cell and a steam generator. The condensate water output end is connected with the electrolytic cell and the steam generator through a pipeline. The power output end is connected with the electrolytic cell and the steam generator through a cable. When the unit is peak shaving, the reheat steam of the unit is extracted to reduce the steam amount entering the steam turbine, thereby reducing the power generation amount. The extracted steam is used for power generation through the energy storage assembly and the stored electric energy is used for electrolyzing water to produce oxygen and hydrogen to increase the income of the power plant. The stored electric energy is also used for heating water into superheated steam to be used as auxiliary steam or to preheat adjacent units, thereby reducing the dependence of auxiliary steam on the steam extraction of the unit, improving the unit efficiency and reducing the coal consumption of the unit.

Description

Technical Field

[0001] This invention relates to the field of power grid peak shaving technology, and in particular to a multi-purpose energy storage peak shaving power generation system. Background Technology

[0002] With the reform of the power system, the requirements of the power grid on the generation side are gradually increasing, requiring the generation side to respond promptly to the peak-shaving needs of the power grid. However, frequent changes in the load on the generation side will lead to changes in the main steam temperature of the unit, causing rapid changes in the thermal stress of the unit, which will cause fatigue to the metal of the unit and threaten the safe operation of the unit. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a multi-purpose energy storage and peak-shaving power generation system, the unit of which features high efficiency and low coal consumption.

[0005] The multi-purpose energy storage and peak-shaving power generation system of this invention includes: a generator set, an energy storage component, and an energy release component. The generator set has a reheat steam output terminal and a condensate output terminal. The energy storage component has a reheat steam input terminal and a power output terminal. The reheat steam output terminal is connected to the reheat steam input terminal via a pipeline so that the energy storage component can generate electricity using the reheat steam supplied by the generator set and store the electrical energy. The energy release component includes an electrolytic cell and a steam generator. The condensate output terminal is connected to the electrolytic cell via a pipeline to supply condensate to the electrolytic cell. The power output terminal is connected to the electrolytic cell via a cable to supply power to the electrolytic cell. The condensate output terminal is connected to the steam generator via a pipeline to supply condensate to the steam generator. The power output terminal is connected to the steam generator via a cable to supply power to the steam generator.

[0006] The multi-purpose energy storage and peak-shaving power generation system of this invention reduces the amount of steam entering the turbine by extracting reheat steam from the generator set during peak shaving, thereby reducing power generation. This eliminates the need for excessive increases or decreases in boiler load, avoiding frequent fluctuations in main and reheat steam temperatures and effectively preventing metal fatigue caused by steam temperature fluctuations. Furthermore, the extracted steam generates electricity through energy storage components and stores the electrical energy. An electrolyzer uses the stored electrical energy to electrolyze water to produce oxygen and hydrogen, increasing the power plant's revenue. A steam generator uses the stored electrical energy to heat water into superheated steam. This superheated steam can be used for auxiliary steam, reducing the dependence of auxiliary steam on generator extraction during normal operation, improving unit efficiency, and reducing coal consumption. The superheated steam can also provide preheating steam for rapid start-up of adjacent units.

[0007] In some embodiments, the energy storage component includes an energy storage turbine, an energy storage generator, and an energy storage module. The energy storage turbine is connected to the energy storage generator, the energy storage generator is connected to the energy storage module, the reheat steam input terminal is located on the energy storage turbine, and the power output terminal is located on the energy storage module.

[0008] In some embodiments, the generator set includes a high-pressure cylinder, a reheater, an intermediate-pressure cylinder, a low-pressure cylinder, and a condenser connected in sequence. The pipe between the output end of the high-pressure cylinder and the input end of the reheater is a cold reheat pipe. The output end of the high-pressure cylinder is the reheat steam output end, and the output end of the condenser is the condensate output end. The energy storage component also includes an extraction steam pipe. One end of the extraction steam pipe is connected to the cold reheat pipe, and the other end of the extraction steam pipe is connected to the reheat steam input section. An extraction steam shut-off valve is provided on the extraction steam pipe.

[0009] In some embodiments, the energy storage component further includes a steam exhaust pipe, the energy storage turbine is connected to the condenser via the steam exhaust pipe, and the steam exhaust pipe is provided with a steam exhaust shut-off valve.

[0010] In some embodiments, the pipeline between the condenser and the electrolytic cell and the steam generator includes a condensate pipeline, a first conveying pipeline and a second conveying pipeline. The condensate pipeline is connected to the condensate output end. One end of the first conveying pipeline is connected to the condensate pipeline, and the other end of the first conveying pipeline is connected to the electrolytic cell. One end of the second conveying pipeline is connected to the condensate pipeline, and the other end of the second conveying pipeline is connected to the steam generator.

[0011] In some embodiments, the condensate pipeline is equipped with a condensate pump and a condensate polishing device, which are distributed at intervals along the flow direction of the condensate.

[0012] In some embodiments, the first conveying pipeline is provided with a first condensate shut-off valve, and the second conveying pipeline is provided with a second condensate shut-off valve.

[0013] In some embodiments, a first switch is provided on the cable between the energy storage module and the electrolytic cell, and a second switch is provided on the cable between the energy storage module and the steam generator.

[0014] In some embodiments, the output end of the electrolytic cell is connected to a mass supply pipe, and the mass supply pipe is provided with a mass supply shut-off valve.

[0015] In some embodiments, the output end of the steam generator is connected to a steam supply pipe, and the steam supply pipe is equipped with a steam supply shut-off valve. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a multi-purpose energy storage peak-shaving power generation system according to an embodiment of the present invention.

[0017] Figure label:

[0018] High-pressure cylinder 11, cold reheat pipeline 111, reheater 12, intermediate-pressure cylinder 13, low-pressure cylinder 14, condenser 15, condensate pipeline 151, condensate pump 152, condensate polishing unit 153.

[0019] Energy storage turbine 21, extraction steam pipe 211, extraction steam shut-off valve 212, exhaust steam pipe 213, exhaust shut-off valve 214, energy storage generator 22, energy storage module 23.

[0020] Electrolytic cell 31, first conveying pipeline 311, first condensate shut-off valve 312, first switch 313, mass supply pipeline 314, mass supply shut-off valve 315, steam generator 32, second conveying pipeline 321, second condensate shut-off valve 322, second switch 323, steam supply pipeline 324, steam supply shut-off valve 325. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] The following describes a multi-purpose energy storage and peak-shaving power generation system according to an embodiment of the present invention with reference to the accompanying drawings.

[0023] like Figure 1 As shown, the multi-purpose energy storage peak-shaving power generation system of this invention includes: a generator set, an energy storage component, and an energy release component.

[0024] The generator set has a reheat steam output terminal and a condensate output terminal, and the energy storage component has a reheat steam input terminal and a power output terminal. The reheat steam output terminal is connected to the reheat steam input terminal via a pipeline so that the energy storage component can generate electricity using the reheat steam delivered by the generator set and store the electrical energy.

[0025] Understandably, the reheated steam generated during generator operation can be discharged through the reheated steam output terminal, and then enter the energy storage component through the pipeline and the reheated steam input terminal. The energy storage component converts the thermal energy in the reheated steam into electrical energy for storage.

[0026] Therefore, when the generator set needs peak shaving, the energy storage unit extracts reheat steam from the generator set to reduce the amount of reheat steam, thereby reducing the generator set's power generation and achieving the purpose of peak shaving. Furthermore, the peak shaving process does not require excessive increases or decreases in boiler load, avoiding frequent fluctuations in main and reheat steam temperatures and effectively preventing metal fatigue caused by steam temperature fluctuations.

[0027] The energy release assembly includes an electrolyzer 31 and a steam generator 32. A condensate output terminal is connected to the electrolyzer 31 via a pipe to supply condensate to the electrolyzer 31, and a power output terminal is connected to the electrolyzer 31 via a cable to supply power to the electrolyzer 31. The condensate output terminal is also connected to the steam generator 32 via a pipe to supply condensate to the steam generator 32, and the power output terminal is connected to the steam generator 32 via a cable to supply power to the steam generator 32.

[0028] Understandably, the condensate from the generator set can be discharged through the condensate output terminal and then transported through pipelines to the electrolytic cell 31 or the steam generator 32. The electrical energy stored by the energy storage components during peak shaving can be transported to the electrolytic cell 31 or the steam generator 32 through the power output terminal.

[0029] Therefore, electrolyzer 31 uses stored electrical energy to electrolyze water, and the oxygen and hydrogen produced are transported to the corresponding users through pipelines, thereby increasing the power plant's revenue. Steam generator 32 uses stored electrical energy to heat water into superheated steam, which is then used as auxiliary steam to reduce the dependence of auxiliary steam on the generator set's extraction steam, thereby improving the generator set's efficiency during normal operation and reducing its coal consumption. Furthermore, the superheated steam can also provide preheating steam for the rapid start-up of adjacent units, thereby reducing the coal energy consumption of adjacent units.

[0030] In some embodiments, such as Figure 1 As shown, the energy storage component includes an energy storage turbine 21, an energy storage generator 22, and an energy storage module 23. The energy storage turbine 21 is connected to the energy storage generator 22, and the energy storage generator 22 is connected to the energy storage module 23. The reheat steam input end is located on the energy storage turbine 21, and the power output end is located on the energy storage module 23.

[0031] Optionally, the energy storage turbine 21 and the energy storage generator 22 are rigidly connected via rotors, and the energy storage generator 22 is connected to the energy storage module 23 via cables. The energy storage turbine 21 and the energy storage generator 22 convert the thermal energy in the reheat steam into electrical energy, which is then stored in the energy storage module 23.

[0032] In some embodiments, such as Figure 1 As shown, the generator set includes a high-pressure cylinder 11, a reheater 12, an intermediate-pressure cylinder 13, a low-pressure cylinder 14, and a condenser 15 connected in sequence.

[0033] The output end of the high-pressure cylinder 11 is connected to the input end of the reheater 12 via a pipeline. The pipeline between the output end of the high-pressure cylinder 11 and the input end of the reheater 12 is the cold reheat pipeline 111. The output end of the high-pressure cylinder 11 is the reheat steam output end. The output end of the reheater 12 is connected to the input end of the intermediate-pressure cylinder 13 via a pipeline. The output end of the intermediate-pressure cylinder 13 is connected to the input end of the low-pressure cylinder 14 via a pipeline. The output end of the low-pressure cylinder 14 is connected to the input end of the condenser 15. The output end of the condenser 15 is the condensate output end.

[0034] The energy storage assembly also includes an extraction steam pipe 211 and an exhaust steam pipe 213. One end of the extraction steam pipe 211 is connected to the reheat steam pipe 111, and the other end is connected to the reheat steam input section. An extraction steam shut-off valve 212 is provided on the extraction steam pipe 211. The energy storage turbine 21 is connected to the condenser 15 via the exhaust steam pipe 213, and an exhaust steam shut-off valve 214 is provided on the exhaust steam pipe 213.

[0035] Understandably, when the generator unit needs peak shaving, the extraction steam shut-off valve 212 and the exhaust steam shut-off valve 214 are opened. Reheat steam sequentially enters the energy storage turbine 21 through the cold reheat pipe 111 and the extraction steam pipe 211, activating and stabilizing the turbine. The rotation of the energy storage turbine 21 drives the energy storage generator 22 to generate electricity, which is then transmitted via cables to the energy storage module 23 for storage. Thus, by reducing the amount of steam entering the reheater 12, the unit's power generation is reduced, achieving the purpose of peak shaving.

[0036] In some embodiments, such as Figure 1 As shown, the piping between the condenser 15 and the electrolytic cell 31 and the steam generator 32 includes a condensate pipe 151, a first conveying pipe 311, and a second conveying pipe 321. The condensate pipe 151 is connected to the condensate output end. One end of the first conveying pipe 311 is connected to the condensate pipe 151, and the other end of the first conveying pipe 311 is connected to the electrolytic cell 31. One end of the second conveying pipe 321 is connected to the condensate pipe 151, and the other end of the second conveying pipe 321 is connected to the steam generator 32.

[0037] That is, the condensate in the condenser 15 is discharged into the condensate pipe 151 through the condensate outlet, and the condensate in the condensate pipe 151 can be transported to the electrolytic cell 31 and the steam generator 32 through the first conveying pipe 311 and the second conveying pipe 321 respectively.

[0038] Furthermore, such as Figure 1As shown, a condensate pump 152 and a condensate polishing device 153 are installed on the condensate pipeline 151, and the condensate pump 152 and the condensate polishing device are distributed at intervals along the flow direction of the condensate. Based on the flow direction of the condensate, upstream and downstream are defined. The condensate pump 152 is located upstream of the condensate polishing device 153, and the connection points between the first conveying pipeline 311 and the condensate pipeline 151, as well as the connection points between the second conveying pipeline 321 and the condensate pipeline 151, are both located downstream of the condensate polishing device 153.

[0039] In some embodiments, such as Figure 1 As shown, a first condensate shut-off valve 312 is provided on the first conveying pipeline 311, which is used to control the opening and closing of the first conveying pipeline 311. A second condensate shut-off valve 322 is provided on the second conveying pipeline 321, which is used to control the opening and closing of the second conveying pipeline 321. Furthermore, a first switch 313 is provided on the cable between the energy storage module 23 and the electrolytic cell 31, and a second switch 323 is provided on the cable between the energy storage module 23 and the steam generator 32.

[0040] Therefore, when the power plant needs to produce oxygen and hydrogen, the first switch 313 is closed to energize the electrolyzer 31, and the first condensate shut-off valve 312 is opened to provide sufficient water to the electrolyzer 31, enabling it to electrolyze water to produce hydrogen and oxygen. Additionally, the second switch 323 is closed to supply power to the steam generator 32, and the second condensate shut-off valve 322 is opened to supply water to the steam generator 32. After the steam generator 32 has finished filling with water, the second condensate shut-off valve 322 is closed, and the steam generator 32 heats the water to produce superheated steam.

[0041] In some embodiments, such as Figure 1 As shown, the output end of the electrolytic cell 31 is connected to a mass supply pipeline 314, and a mass supply shut-off valve 315 is provided on the mass supply pipeline 314. The oxygen and hydrogen produced by the electrolysis of the electrolytic cell 31 can be transported to the corresponding users through the mass supply shut-off valve 315 and the mass supply pipeline 314 by opening the mass supply shut-off valve, thereby generating economic benefits.

[0042] In some embodiments, such as Figure 1 As shown, the output end of the steam generator 32 is connected to a steam supply pipe 324, and a steam supply shut-off valve 325 is provided on the steam supply pipe 324. By opening the steam supply shut-off valve 325, the superheated steam generated by the steam generator 32 is supplied to the auxiliary steam or adjacent units for preheating via the steam supply pipe 324.

[0043] The following describes in detail the operation method of the multi-purpose energy storage peak-shaving power generation system according to an embodiment of the present invention.

[0044] When the generator set needs to shaving peak loads, the extraction steam shut-off valve 212 and the exhaust steam shut-off valve 214 are opened, allowing some reheat steam to enter the energy storage turbine 21 through the extraction steam pipe 211. The energy storage turbine 21 runs and drives the energy storage generator 22 to generate electricity, which is then transmitted to the energy storage module 23 for storage via cables.

[0045] When the power plant needs to produce oxygen and hydrogen, the first switch 313 is closed to power the electrolyzer 31, and the first condensate shut-off valve 312 is opened to provide sufficient water to the electrolyzer 31. The oxygen and hydrogen produced by electrolysis can be delivered to the corresponding users through the mass supply shut-off valve 315 and the mass supply pipeline 314.

[0046] When the unit is not shaving peak loads, the electrical energy stored during peak load shaving can be used to power the steam generator 32 by closing the second switch 323. The second condensate shut-off valve 322 is opened to supply water to the steam generator 32. After the steam generator 32 has finished filling with water, the second condensate shut-off valve 322 is closed. The steam generator 32 heats the water into superheated steam, which is then supplied to auxiliary steam or adjacent units for preheating via the steam supply shut-off valve 325 and the steam supply pipeline 324.

[0047] Therefore, in the multi-purpose energy storage and peak-shaving power generation system of this embodiment, during the peak-shaving phase of the generator set, a portion of high-quality steam (reheat steam) is extracted from the cold reheat pipe 111 of the generator set to drive the energy storage turbine 21 to perform work. This not only assists the generator set in peak shaving but also allows the electrical energy to be stored for other uses. The electrical energy stored in the energy storage module 23 can not only increase the power plant's revenue by electrolyzing water in the electrolyzer 31 to produce oxygen and hydrogen, but also heat water into superheated steam through the steam generator 32. The superheated steam can be used for auxiliary steam, reducing the dependence of the auxiliary steam on the generator set's extraction steam during normal operation, improving unit efficiency, and reducing unit coal consumption. The superheated steam can also provide steam for the preheating and rapid start-up of adjacent units.

[0048] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0050] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0052] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A multi-purpose energy storage and peak-shaving power generation system, characterized in that, include: A generator set having a reheat steam output terminal and a condensate output terminal; The generator set includes a high-pressure cylinder, a reheater, an intermediate-pressure cylinder, a low-pressure cylinder, and a condenser connected in sequence. The pipe between the output end of the high-pressure cylinder and the input end of the reheater is a cold reheat pipe. The output end of the high-pressure cylinder is the reheat steam output end, and the output end of the condenser is the condensate output end. An energy storage component has a reheat steam input terminal and a power output terminal. The reheat steam output terminal is connected to the reheat steam input terminal via a pipeline. The energy storage component includes an energy storage turbine, an energy storage generator, and an energy storage module. The energy storage turbine is connected to the energy storage generator, and the energy storage generator is connected to the energy storage module, so that the energy storage component can generate electricity using the reheat steam supplied by the generator set and store the electrical energy in the energy storage module. The energy storage component is configured to operate when the generator set responds to the grid peak shaving command to extract the reheat steam and reduce the amount of steam entering the reheater. The energy storage component also includes an exhaust pipe, through which the energy storage turbine is connected to the condenser. The energy release assembly includes an electrolytic cell and a steam generator. The piping between the condenser and the electrolytic cell and the steam generator includes a condensate pipe, a first conveying pipe, and a second conveying pipe. The condensate pipe is connected to a condensate output end. One end of the first conveying pipe is connected to the condensate pipe, and the other end is connected to the electrolytic cell. One end of the second conveying pipe is connected to the condensate pipe, and the other end is connected to the steam generator. A condensate polishing device is provided on the condensate pipe. The condensate output end is connected to the electrolytic cell via a pipe to supply condensate to the electrolytic cell. A power output end is connected to the electrolytic cell via a cable to supply power to the electrolytic cell. The condensate output end is connected to the steam generator via a pipe to supply condensate to the steam generator. The power output end is connected to the steam generator via a cable to supply power to the steam generator. The steam generator is used to produce superheated steam for auxiliary steam or preheating of adjacent units.

2. The multi-purpose energy storage and peak-shaving power generation system according to claim 1, characterized in that, The reheat steam input terminal is located on the energy storage turbine, and the power output terminal is located on the energy storage module.

3. The multi-purpose energy storage and peak-shaving power generation system according to claim 2, characterized in that, The energy storage component also includes a steam extraction pipe, one end of which is connected to the cold reheat pipe and the other end of which is connected to the reheat steam input section. The steam extraction pipe is equipped with a steam extraction shut-off valve.

4. The multi-purpose energy storage and peak-shaving power generation system according to claim 3, characterized in that, The exhaust pipe is equipped with an exhaust shut-off valve.

5. The multi-purpose energy storage and peak-shaving power generation system according to claim 4, characterized in that, The condensate pipeline is also equipped with a condensate pump, and the condensate pump and the condensate treatment device are distributed at intervals along the flow direction of the condensate.

6. The multi-purpose energy storage and peak-shaving power generation system according to claim 4, characterized in that, The first conveying pipeline is equipped with a first condensate shut-off valve, and the second conveying pipeline is equipped with a second condensate shut-off valve.

7. The multi-purpose energy storage and peak-shaving power generation system according to claim 2, characterized in that, A first switch is provided on the cable between the energy storage module and the electrolytic cell, and a second switch is provided on the cable between the energy storage module and the steam generator.

8. The multi-purpose energy storage and peak-shaving power generation system according to claim 1, characterized in that, The output end of the electrolytic cell is connected to a mass supply pipe, and the mass supply pipe is equipped with a mass supply shut-off valve.

9. The multi-purpose energy storage and peak-shaving power generation system according to claim 1, characterized in that, The output end of the steam generator is connected to a steam supply pipeline, and the steam supply pipeline is equipped with a steam supply shut-off valve.

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