Thermal power plant electrode steam boiler steam pipe network heat storage system

Abstract

The utility model discloses a thermal power plant electrode steam boiler steam pipe network heat storage system which comprises a thermal power generating unit, an electrode steam boiler, a steam pipe network, a first valve and a control module. The steam boiler is driven to generate steam through the surplus electric quantity of the thermal power generating unit under the peak regulation and frequency modulation working conditions; the steam pipe network is connected with a steam output port of the electrode steam boiler, and steam generated by the steam boiler is fed into the steam pipe network for heat storage; the first valve is arranged on the steam conveying pipeline between the steam boiler and the steam pipe network; the control module is electrically connected with the first valve and used for controlling the opening degree of the first valve. According to the thermal power plant electrode steam boiler steam pipe network heat storage system, an industrial steam pipe network is used for heat storage, the deep peak regulation requirement of a thermal power generating unit under the low load can be met, and the industrial steam supply problem under deep peak regulation can be solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal power generation, and particularly relates to a steam network heat storage system for an electrode steam boiler in a thermal power plant. Background Art

[0002] In the related art, in a thermal power plant, due to deep peak shaving, the extraction steam parameters cannot meet the parameter requirements of industrial steam users. In addition, coal-fired or gas-fired steam boilers in industrial facilities are replaced by industrial steam supply from thermal power plants, and the length of industrial steam pipelines for external heating in thermal power plants has reached new highs. Whether in the south or the north, there are pipeline projects for long-distance industrial steam supply with a length exceeding 30 kilometers. In fact, with the increase in the length and diameter of industrial steam pipelines, the volume of the industrial steam network is getting larger and larger, and the steam network forms a huge heat storage container for storing steam. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0004] Therefore, an embodiment of the utility model provides a steam network heat storage system for an electrode steam boiler in a thermal power plant. By using the industrial steam network for heat storage, it can not only meet the deep peak shaving requirements of thermal power units under low load, but also solve the problem of industrial steam supply under deep peak shaving.

[0005] The steam network heat storage system for an electrode steam boiler in a thermal power plant according to an embodiment of the utility model includes:

[0006] A thermal power unit;

[0007] An electrode steam boiler, which is connected to the thermal power unit to drive the electrode steam boiler to generate steam by the surplus power of the thermal power unit under peak shaving and frequency modulation conditions;

[0008] A steam network, which is connected to the steam outlet of the electrode steam boiler, and the steam generated by the electrode steam boiler is sent to the steam network for heat storage;

[0009] A first valve, which is arranged on the steam transmission pipeline between the electrode steam boiler and the steam network;

[0010] A control module, which is electrically connected to the first valve, and the control module is used to control the opening degree of the first valve.

[0011] An embodiment of the utility model provides a steam network heat storage system for an electrode steam boiler in a thermal power plant. By using the industrial steam network for heat storage, it can not only meet the deep peak shaving requirements of thermal power units under low load, but also solve the problem of industrial steam supply under deep peak shaving.

[0012] In some embodiments, the electrode steam boiler includes a boiler body and an electric steam superheater.

[0013] In some embodiments, the electrode steam boiler is one of a jet steam boiler and a semi-immersed steam boiler, or a combination of both.

[0014] In some embodiments, the electrode steam boiler further includes a salt addition unit; and / or

[0015] The electrode steam boiler further includes a power supply control cabinet, and the power cord in the power supply control cabinet is connected to any one or more of the generator outlet in the thermal power unit, the power consumption busbar in the thermal power plant, and the 220KV busbar after the step-up substation in the thermal power plant through protection and a transformer.

[0016] In some embodiments, the electrode steam boiler includes a water replenishment unit, and the water replenishment unit is connected to the chemical water workshop connected to the thermal power unit.

[0017] In some embodiments, the electrode steam boiler is a start-up steam boiler for a thermal power plant.

[0018] In some embodiments, a steam pipeline monitoring module is further included. The steam pipeline monitoring module is used to monitor the operating parameters in the steam pipeline, and the steam pipeline monitoring module is connected to the control module to control the opening degree of the first valve through the monitoring signal obtained by the steam pipeline monitoring module.

[0019] In some embodiments, the steam pipeline monitoring module includes a plurality of detection sensors, and the plurality of detection sensors are used to respectively obtain the pressure signal, temperature signal and flow signal in the steam pipeline; and / or

[0020] The steam pipeline monitoring module further includes any one or a combination of two of a pipeline support thrust detection component and a pipeline stress detection component; and / or

[0021] The steam pipeline monitoring module further includes any one or more of a pipeline expansion joint safety monitoring component, a flow rate adjustment and control component for the main pipe and branch pipes of the pipeline network, and a pipeline network pressure relief safety valve monitoring component.

[0022] In some embodiments, a peak shaving and frequency modulation module is further included. The peak shaving and frequency modulation module is connected to the thermal power unit and the electrode steam boiler, and the peak shaving and frequency modulation module is used to control the increase or decrease of the power consumption of the electrode steam boiler according to the peak shaving and frequency modulation conditions of the thermal power unit, so that the increase or decrease of the power consumption of the electrode steam boiler responds to the peak shaving and frequency modulation requirements of the thermal power unit.

[0023] In some embodiments, it further includes a steam pipe network heat storage simulation system. The steam pipe network has a GIS information module, and the steam pipe network heat storage simulation system is constructed by using the GIS information module and a computer simulation system. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a heat storage system for a steam pipe network of an electrode steam boiler in an embodiment of the present invention.

[0025] Figure 2 is a schematic structural diagram of a heat storage system for a steam pipe network of an electrode steam boiler in another embodiment of the present invention.

[0026] Figure 3 is a schematic structural diagram of a steam pipe network heat storage simulation system in an embodiment of the present invention.

[0027] Reference Signs:

[0028] 1. Thermal power unit; 11. Generator; 12. Busbar for thermal power plant electricity consumption; 13. 220 kV busbar after the step-up substation of the thermal power plant;

[0029] 2. Electrode steam boiler; 21. Steam transmission pipeline; 22. Protection and transformer;

[0030] 3. Steam pipe network;

[0031] 4. First valve;

[0032] 5. Control module;

[0033] 6. Steam pipe network monitoring module;

[0034] 7. Peak shaving and frequency modulation module;

[0035] 8. Chemical water workshop;

[0036] 9. Salt addition unit;

[0037] 101. GIS information module; 102. Computer simulation system; 103. Steam pipe network heat storage simulation system. Detailed Embodiments

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0039] As the length and diameter of industrial steam pipelines increase, the volume of the industrial steam pipe network also becomes larger and larger, thus forming a huge heat storage container for storing steam. The utility model utilizes the industrial steam pipe network for heat storage and the surplus power during the peak shaving and frequency modulation of thermal power plants, which can not only meet the deep peak shaving requirements of thermal power units 1 under low load, but also solve the problem of industrial steam supply under deep peak shaving.

[0040] Specifically, as Figure 1 shown, the heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to an embodiment of the utility model includes a thermal power unit 1, an electrode steam boiler 2, a steam pipe network 3, a first valve 4 and a control module 5. The electrode steam boiler is connected to the thermal power unit 1 to drive the electrode steam boiler 2 to generate steam by using the surplus power of the thermal power unit 1 under the peak shaving and frequency modulation conditions; the steam pipe network 3 is connected to the steam outlet of the electrode steam boiler 2, and the steam generated by the electrode steam boiler 2 is sent to the steam pipe network 3 for heat storage; the first valve 4 is arranged on the steam transmission pipeline 21 between the electrode steam boiler 2 and the steam pipe network 3; the control module 5 is electrically connected to the first valve 4, and the control module 5 is used to control the opening degree of the first valve 4.

[0041] Among them, when the thermal power unit 1 is performing peak shaving, if the power generated by the thermal power unit 1 is greater than the power fed into the grid, the surplus power can be used to drive the electrode steam boiler 2 to generate steam, and then the steam is transported to the steam pipe network 3 for heat storage. Since the steam volume in the steam pipe network 3 has a certain limit threshold, the control module 5 and the first valve 4 are set to control the steam transported to the steam pipe network 3 to prevent the parameters such as the steam flow rate, temperature and pressure in the steam pipe network 3 from exceeding the limits of safe operation.

[0042] The embodiment of the utility model provides a heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant. By using the industrial steam pipe network 3 for heat storage, it can not only meet the deep peak shaving requirements of the thermal power unit 1 under low load, but also solve the problem of industrial steam supply under deep peak shaving.

[0043] As Figure 1 and Figure 2 shown, in some embodiments, the thermal power unit 1 has a power supply port, and the electrode steam boiler is connected to the power supply port. By arranging the electrode steam boiler 2 in the thermal power plant and injecting the steam generated by the electrode steam boiler 2 into the industrial steam pipe network 3 for heat storage, low-cost electric heat storage peak shaving and frequency modulation can be achieved. The thermal power unit includes a boiler, a steam turbine and a generator, and the surplus electric energy generated by the generator is used to drive the electrode steam boiler to generate steam.

[0044] Optionally, the electrode steam boiler further includes a power supply control cabinet. The power cord in the power supply control cabinet is connected to any one or more of the outlet of the generator 11 in the thermal power unit 1, the power consumption busbar 12 of the thermal power plant, and the 220 kV busbar 13 after the step-up substation of the thermal power plant through the protection and transformer 22. The power supply control cabinet and the protection and transformer 22 can ensure the normal and safe operation of the electrode steam boiler. The electrode steam boiler can obtain power through any one or more of the outlet of the generator 11, the power consumption busbar 12 of the thermal power plant, and the 220 kV busbar 13 after the step-up substation of the thermal power plant. The power supply method is flexible, and the power supply method can be controlled according to the actual working conditions.

[0045] Further, the electrode steam boiler 2 includes a boiler body and an electric steam superheater. The electric steam superheater can heat the water in the boiler body and generate steam.

[0046] Optionally, the electrode steam boiler is one of a jet steam boiler and a semi-immersed steam boiler, or a combination of the two. That is to say, the electrode steam boiler can be one or multiple. According to the peak shaving and frequency modulation requirements of the thermal power unit 1, the operation of one electrode steam boiler or multiple electrode steam boilers can be controlled. When there are multiple electrode steam boilers, some boilers can be jet steam boilers, and other boilers can be semi-immersed steam boilers. According to the characteristics of different electrode steam boilers, the start and stop under different peak shaving and frequency modulation working conditions can be selected.

[0047] As Figure 2 shown, in some embodiments, the electrode steam boiler further includes a salt adding unit 9. The salt adding unit 9 can add salt into the electrode steam boiler. When the salt substance is heated, it can be decomposed into ions to achieve ion heat conduction, improve the heat transfer efficiency, and prevent the boiler water from scaling, thereby improving the stability of the equipment operation.

[0048] Further, the electrode steam boiler includes a water replenishing unit. The water replenishing unit is connected to the chemical water workshop 8 of the thermal power unit 1, and uses the water in the chemical water workshop 8 to replenish water to the electrode steam boiler 2, so as to realize the recycling of the water cycle in the thermal power plant and reduce the waste of water resources. The water replenishing unit includes a water pump and a water delivery pipe, and uses the water pump to extract water and pump it into the electrode steam boiler 2.

[0049] As Figure 2 shown, in some embodiments, the electrode steam boiler is the start-up steam boiler of the thermal power plant. It should be understood that using the steam of the electrode steam boiler as the start-up steam of the thermal power unit 1 does not require the use of coal-fired, gas-fired, or oil-fired steam boilers, or the original coal-fired, gas-fired, or oil-fired steam boilers can be retained as a backup, so as to reduce energy waste and achieve energy conservation.

[0050] As Figure 2As shown, in some embodiments, the thermal energy storage system of the steam pipe network of the thermal power plant electrode steam boiler further includes a steam pipe network monitoring module 6. The steam pipe network monitoring module 6 is used to monitor the operating parameters in the steam pipe network 3. The steam pipe network monitoring module 6 is connected to the control module 5 to control the opening degree of the first valve 4 through the monitoring signal obtained by the steam pipe network monitoring module 6. It should be understood that through the effective monitoring of the steam pipe network 3, the operating state of the current steam pipe network 3 can be effectively and accurately evaluated. On the premise of ensuring the effective and stable operation of the steam pipe network 3, the steam generated by the electrode steam boiler is transported into the steam pipe network 3 for thermal energy storage.

[0051] As Figure 2 shown, in some embodiments, the steam pipe network monitoring module 6 includes a plurality of detection sensors. The plurality of detection sensors are used to respectively obtain the pressure signal, temperature signal and flow signal in the steam pipe network 3. For example, by arranging temperature sensors, pressure sensors and flow sensors to respectively detect the temperature, pressure and flow in the steam pipe network 3, the number of various types of sensors can be multiple. By detecting different positions of the steam pipe network 3, the effectiveness and accuracy of the stability evaluation of the steam pipe network 3 are improved.

[0052] As Figure 2 shown, further, the steam pipe network monitoring module 6 further includes any one or a combination of two of a pipe support thrust detection component and a pipe stress detection component; It should be understood that the detection of pipe support thrust and pipe stress are both means for evaluating the safety and stability of the steam pipe network 3, which can further reflect the operating condition of the steam pipe system, and can more effectively reflect whether there is steam volume margin in the current steam pipe network 3, and then facilitate the control module 5 to adjust the opening degree of the first valve 4.

[0053] Further, the steam pipe network monitoring module 6 further includes any one or a combination of multiple of a pipe expansion joint safety monitoring component, a main pipe and branch pipe flow regulation and control component, and a network pressure relief safety valve monitoring component. It should be understood that by monitoring the working conditions of the expansion joints on the steam pipes, the safety condition of the pipes can be judged. By adjusting the flow of the main pipe and branch pipes, the flow distribution in the steam pipe network 3 can be reasonably distributed. By detecting the pressure relief safety valve, the pressure relief of the safety valve can be controlled to ensure the operation safety of the steam pipe network 3. Some or all of the above means can be set, so as to improve the safety of the system and the effective monitoring of the steam pipe network 3.

[0054] As Figure 2As shown, in some embodiments, the thermal storage system of the steam pipe network of the electrode steam boiler in a thermal power plant further includes a peak shaving and frequency modulation module 7. The peak shaving and frequency modulation module 7 is connected to the thermal power unit 1 and the electrode steam boiler. The peak shaving and frequency modulation module 7 is configured to increase or decrease the power consumption of the electrode steam boiler according to the peak shaving and frequency modulation operating conditions of the thermal power unit 1, so that the increase or decrease of the power consumption of the electrode steam boiler responds to the peak shaving and frequency modulation requirements of the thermal power unit.

[0055] During operation, the surplus power generated by the flexible peak shaving and frequency modulation of the thermal power unit 1 is used to drive the electrode steam boiler to generate steam, and the steam generated by the electrode steam boiler is sent to the industrial steam pipe network 3 for thermal storage.

[0056] The peak shaving and frequency modulation operating conditions at least include the following situations:

[0057] When the thermal power unit 1 receives the peak shaving or frequency modulation requirement from the grid dispatching to reduce the on-grid power, the peak shaving and frequency modulation module 7 is used to control the electrode steam boiler to increase its surplus power consumption, and the generated steam is sent to the industrial steam pipe network 3 for thermal storage, so as to achieve the rapid response of the thermal power unit 1 to the flexible peak shaving and frequency modulation auxiliary service requirements.

[0058] When the thermal power unit 1 receives the peak shaving or frequency modulation requirement from the grid dispatching to increase the on-grid power, the peak shaving and frequency modulation module 7 is used to control the electrode steam boiler to reduce its surplus power consumption, so as to achieve the rapid response of the thermal power unit 1 to the flexible peak shaving and frequency modulation auxiliary service requirements.

[0059] Furthermore, the peak shaving and frequency modulation module controls the increase or decrease of the power consumption of the electrode steam boiler according to the peak shaving and frequency modulation load requirements of the regional power grid for the thermal power plant or the electricity price quotes and their trends on the power generation side of the regional power market, so as to increase the response ability of the thermal power plant to the peak shaving and frequency modulation load requirements or electricity prices of the power grid.

[0060] As Figure 3 shown, in some embodiments, the thermal storage system of the steam pipe network of the electrode steam boiler in a thermal power plant further includes a thermal storage simulation system for the steam pipe network 3. The steam pipe network 3 has a GIS information module 101, and the GIS information module 101 and the computer simulation system 102 are used to construct a thermal storage simulation system for the steam pipe network 3, and a thermal storage simulation model of the steam pipe network 3 is built.

[0061] It should be understood that the pipe network GIS, namely the pipe network geographic information system, is a computer system that uses modern computer graphics and database technologies to input, store, edit, query, analyze, display, and output geographic graphics and their attribute data. It combines geography, geometry, computer science, and various application objects and is an integrated information technology. The steam pipe network 3 GIS system plays a key role. It can not only display and query the distribution and attribute information of the steam pipe network 3 but also manage and analyze spatial data, support dynamic data update and maintenance, thereby helping managers more effectively manage and plan urban infrastructure. Through the steam pipe network 3 GIS information module 101, the detailed information of each device can be clearly understood, realizing comprehensive and thorough management of the pipe network.

[0062] The built steam pipe network 3 heat storage simulation model can simulate and analyze the actual operation status of the pipe network, improve management and dispatching capabilities, and further improve the operation efficiency and effect of the heat storage system of the electrode steam boiler steam pipe network in thermal power plants.

[0063] Compared with related technologies, the present utility model has the following beneficial technical effects:

[0064] 1) The heat storage system of the electrode steam boiler steam pipe network in thermal power plants proposed by the present utility model uses the surplus power of thermal power flexibility peak regulation and frequency modulation to drive the electrode steam boiler for energy storage, enhancing the peak regulation and frequency modulation response ability of the thermal power unit 1.

[0065] 2) The heat storage system of the electrode steam boiler steam pipe network in thermal power plants proposed by the present utility model can achieve heat storage and energy storage at low cost, especially suitable for the growing and expanding trend of industrial steam pipe networks 3 in southern regions.

[0066] 3) The electrode steam boiler in the heat storage system of the electrode steam boiler steam pipe network in thermal power plants proposed by the present utility model can replace the existing start-up steam boiler, and the electrode steam boiler and the existing start-up steam boiler can be used as backups for each other.

[0067] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0068] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0069] In the present utility model, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0070] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0071] In the present utility model, terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0072] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A thermal energy storage system for the steam pipe network of an electrode steam boiler in a thermal power plant, characterized in that, Including: Thermal power unit; Electrode steam boiler, which is connected to the thermal power unit to drive the electrode steam boiler to generate steam by the surplus power of the thermal power unit under peak shaving and frequency modulation conditions; Steam pipe network, which is connected to the steam outlet of the electrode steam boiler, and the steam generated by the electrode steam boiler is sent to the steam pipe network for heat storage; First valve, which is arranged on the steam transmission pipeline between the electrode steam boiler and the steam pipe network; Control module, which is electrically connected to the first valve, and the control module is used to control the opening degree of the first valve.

2. The heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 1, characterized in that The electrode steam boiler includes a boiler body and an electric steam superheater.

3. The heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 2, characterized in that The electrode steam boiler is one of a jet steam boiler and a semi-immersed steam boiler, or a combination of both.

4. The heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 1, wherein The electrode steam boiler further includes a salt addition unit; and / or The electrode steam boiler further includes a power supply control cabinet, and the power supply line in the power supply control cabinet is connected to any one or more of the generator outlet, the power consumption bus of the thermal power plant, and the 220KV bus after the step-up substation of the thermal power plant through protection and transformers.

5. The heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 1, wherein The electrode steam boiler includes a water replenishment unit, and the water replenishment unit is connected to the chemical water workshop connected to the thermal power unit.

6. The heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 1, characterized in that, The electrode steam boiler is the start-up steam boiler of the thermal power plant.

7. The heat storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 1, characterized in that, It further includes a steam pipe network monitoring module, which is used to monitor the operating parameters in the steam pipe network. The steam pipe network monitoring module is connected to the control module to control the opening degree of the first valve through the monitoring signal obtained by the steam pipe network monitoring module.

8. The thermal storage system of the steam pipe network of the electrode steam boiler in a thermal power plant according to claim 7, characterized in that, The steam pipe network monitoring module includes a plurality of detection sensors, and the plurality of detection sensors are used to respectively obtain the pressure signal, temperature signal and flow signal in the steam pipe network; and / or The steam pipe network monitoring module further includes any one or a combination of two of a pipe support thrust detection component and a pipe stress detection component; and / or The steam pipe network monitoring module further includes any one or more of a pipe expansion joint safety monitoring component, a main pipe and branch pipe flow regulation and control component of the pipe network, and a pipe network pressure relief safety valve monitoring component.

9. The heat storage system for the steam pipe network of the electrode steam boiler in a thermal power plant according to any one of claims 1 to 8, characterized in that, It further includes a peak shaving and frequency modulation module, which is connected to the thermal power unit and the electrode steam boiler. The peak shaving and frequency modulation module is used to control the increase or decrease of the power consumption of the electrode steam boiler according to the peak shaving and frequency modulation conditions of the thermal power unit, so that the increase or decrease of the power consumption of the electrode steam boiler responds to the peak shaving and frequency modulation requirements of the thermal power unit.

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