A turbine system for driving a water pump coaxially with a main steam turbine

Abstract

This utility model discloses a turbine system in which the main steam turbine coaxially drives a water pump, belonging to the field of coal-fired power technology. This system aims to solve the problem of low energy efficiency in existing feedwater pump turbine-driven systems. This utility model employs a turbine system composed of a secondary reheat unit and a primary reheat unit. The main shaft of the secondary reheat turbine drives a first feedwater pump through a coupling and a gearbox. The first feedwater pump supplies water to both the secondary and primary reheat boilers simultaneously. A second feedwater pump turbine is also provided, driving a second feedwater pump that supplies water to both boilers simultaneously. Through this structure, this utility model utilizes the main steam turbine to directly drive the feedwater pump, eliminating the need for a separate feedwater pump turbine, reducing plant power consumption, and improving the overall thermal efficiency of the power plant.

Description

Technical Field

[0001] This utility model belongs to the field of coal power technology, specifically relating to a turbine system for coaxially driving a feedwater pump by the main steam turbine in energy-saving retrofitting of coal power units. Background Technology

[0002] Thermal power plants are an important component of modern power systems. In thermal power generating units, feedwater pumps are among the most critical auxiliary equipment; their reliability and energy efficiency directly affect the safe and stable operation of the unit and the economic viability of the power plant.

[0003] Currently, the feedwater pumps of large thermal power generating units are mainly driven by independent feedwater pump turbines or electric motors. However, the traditional feedwater pump turbine drive method suffers from low energy efficiency. To improve the overall operating efficiency of power plants, reduce plant power consumption, simplify the feedwater pump system, and reduce maintenance wear and tear on related equipment, developing new, efficient, and energy-saving feedwater pump drive methods has become an important research direction in the field of energy conservation and consumption reduction for thermal power generating units.

[0004] In recent years, with the application of advanced power generation technologies such as ultra-supercritical and double reheat, higher requirements have been placed on the efficiency and reliability of feedwater systems. Double reheat units, as an advanced coal-fired power unit technology, offer higher thermal efficiency. Combining novel feedwater pump drive methods with double reheat units to achieve energy-efficient and optimized operation of the feedwater system is of great significance for further improving the overall energy efficiency of coal-fired power units. Utility Model Content

[0005] One of the objectives of this utility model is to at least solve one or more of the aforementioned problems existing in the prior art. In other words, one of the objectives of this utility model is to provide a turbine system for coaxially driving a water pump by a main steam turbine that meets one or more of the aforementioned requirements.

[0006] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0007] A turbine system coaxially driven by a main steam turbine and a feedwater pump includes a secondary reheat boiler, a secondary reheat steam turbine, a primary reheat boiler, a primary reheat steam turbine, a first feedwater pump, a second feedwater pump, and a second feedwater pump turbine.

[0008] The main steam outlet of the secondary reheat boiler is connected to the steam inlet of the secondary reheat turbine. The main shaft of the secondary reheat turbine is driven to connect with the main shaft of the first feedwater pump through a coupling and a gearbox. The outlet of the first feedwater pump branches into a first feedwater pipe and a second feedwater pipe. The first feedwater pipe is connected to the feedwater inlet of the secondary reheat boiler, and the second feedwater pipe is connected to the feedwater inlet of the primary reheat boiler.

[0009] The main steam outlet of the primary reheat boiler is connected to the steam inlet of the primary reheat turbine. The main shaft of the second feedwater pump turbine is driven to be connected to the main shaft of the second feedwater pump. The outlet of the second feedwater pump branches into a third feedwater pipe and a fourth feedwater pipe. The third feedwater pipe is connected to the feedwater inlet of the secondary reheat boiler, and the fourth feedwater pipe is connected to the feedwater inlet of the primary reheat boiler.

[0010] Furthermore, the turbine system also includes a first deaerator and a second deaerator. The first feedwater outlet of the first deaerator and the feedwater outlet of the second deaerator are connected and then split into two paths, which are respectively connected to the feedwater inlets of the secondary reheat boiler and the primary reheat boiler. The second feedwater outlet of the first deaerator is connected to the inlet of the first feedwater pump. By setting up a first deaerator and a second deaerator and splitting the feedwater pipeline, the water supply to the two deaerators and the water flowing to the two units can be mutually supplemented, avoiding the problem of insufficient water supply to one unit or insufficient water volume in the deaerator, and improving the operational reliability and flexibility of the system.

[0011] Furthermore, the turbine system also includes a booster pump, with the second feedwater outlet of the first deaerator connected to the inlet of the booster pump, and the outlet of the booster pump connected to the inlet of the first feedwater pump. By setting up the booster pump, the inlet pressure of the first feedwater pump can be increased, preventing feedwater pump cavitation, and assisting in regulating the feedwater flow rate, ensuring stable operation and flow regulation of the feedwater pump.

[0012] Furthermore, the turbine system also includes an electric pump. The first feedwater outlet of the first deaerator and the feedwater outlet of the second deaerator are connected to the inlet of the electric pump. The outlet of the electric pump is divided into two paths, which are respectively connected to the feedwater inlets of the secondary reheat boiler and the primary reheat boiler. By providing the electric pump, it can be used as a start-up feedwater pump during the unit startup phase, ensuring the reliability of unit startup.

[0013] Furthermore, the outlet of the first feedwater pump is connected to the inlet of the first feedwater header. The outlet of the first feedwater header is split into two branches, which are connected to the feedwater inlets of the secondary reheat boiler and the primary reheat boiler respectively via the first feedwater pipe and the second feedwater pipe. Using a feedwater header facilitates water distribution and pipe connections, simplifying the system structure.

[0014] Furthermore, the outlet of the second feedwater pump is connected to the inlet of the second feedwater header. The outlet of the second feedwater header splits into two branches, which are connected to the feedwater inlets of the secondary reheat boiler and the primary reheat boiler respectively via the third and fourth feedwater pipes. Using a feedwater header facilitates water distribution and pipeline connections, simplifying the system structure.

[0015] Furthermore, the booster pump is a centrifugal pump driven by a variable frequency motor. Using a centrifugal pump driven by a variable frequency motor as a booster pump enables precise adjustment of the water supply flow rate, meeting the water supply requirements under different operating conditions.

[0016] Furthermore, the electric pump is a centrifugal pump driven by a variable frequency motor. Using a centrifugal pump driven by a variable frequency motor as the electric pump enables the regulation of the start-up water flow rate and improves the smoothness of the start-up process.

[0017] Furthermore, the ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder, and low pressure cylinder of the reheat turbine are coaxially connected. This single-shaft, four-cylinder structure reduces the length and footprint of the turbine unit, simplifying its structure.

[0018] Furthermore, the high-pressure, intermediate-pressure, and low-pressure cylinders of the reheat turbine are coaxially connected. This single-shaft, three-cylinder structure reduces the turbine unit's length and floor space, simplifying its structure.

[0019] The turbine system for coaxially driving a feedwater pump by a main steam turbine provided by this utility model has the following beneficial effects:

[0020] By directly driving the feedwater pumps from the main steam turbine, replacing the traditional feedwater pump-turbine drive method, this significantly reduces power plant electricity consumption, improves overall thermal efficiency, and lowers operating costs. Furthermore, this invention utilizes feedwater pipeline diversion and a dual deaerator configuration to achieve mutual supplementation of feedwater to the two deaerators and the two generating units, effectively avoiding problems such as insufficient water supply to a single unit or insufficient water volume in the deaerator. This improves system reliability and flexibility, ensuring safe and stable unit operation. An electric pump is also installed as a start-up feedwater pump, ensuring reliable water supply during unit startup and improving startup success rate and efficiency. Both the booster pump and the electric pump are driven by variable frequency motors, enabling precise adjustment of feedwater flow according to unit operating conditions to meet different load demands and optimize operation control. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the turbine system for the coaxial drive of the main steam turbine and feedwater pump provided in this embodiment of the utility model.

[0022] Reference numerals: 100-Secondary reheat unit, 110-Secondary reheat boiler, 120-Secondary reheat turbine, 200-Primary reheat unit, 210-Primary reheat boiler, 220-Primary reheat turbine, 230-Secondary feedwater pump turbine, 310-First feedwater pump, 320-Secondary feedwater pump, 330-Pre-pump, 340-Electric pump, 410-First main steam pipe, 420-Secondary main steam pipe, 430-First feedwater header, 431-First feedwater pipe, 432-Secondary feedwater pipe, 440-Secondary feedwater header, 441-Third feedwater pipe, 442-Fourth feedwater pipe, 510-Coupling, 520-Gearbox, 610-First deaerator, 620-Secondary deaerator. Detailed Implementation

[0023] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0024] The following description provides examples and does not limit the scope, applicability, or examples set forth in the claims. Changes may be made to the function and arrangement of the described elements without departing from the scope of this application. Various processes or components may be appropriately omitted, substituted, or added to the examples. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

[0025] The turbine system of the main steam turbine coaxially driving the water pump in this embodiment is shown in the schematic diagram below. Figure 1 As shown.

[0026] like Figure 1 As shown, the turbine system is composed of a secondary reheat unit 100 and a primary reheat unit 200. Specifically, it includes the secondary reheat unit 100, a secondary reheat boiler 110 that provides superheated steam to the secondary reheat unit 100, a primary reheat unit 200, a primary reheat boiler 210 that provides superheated steam to the primary reheat unit 200, a first feedwater pump 310 that supplies water to the secondary reheat boiler 110 and the primary reheat boiler 210, and a second feedwater pump 320 that supplies water to the secondary reheat boiler 110 and the primary reheat boiler 210.

[0027] The secondary reheat boiler 110 generates high-temperature, high-pressure secondary reheat steam, while the secondary reheat turbine 120 converts the energy of the secondary reheat steam into mechanical energy. The main steam outlet of the secondary reheat boiler 110 is connected to the steam inlet of the secondary reheat turbine 120 via a first main steam pipe 410; specifically, it is connected to the steam inlet of the ultra-high pressure cylinder of the secondary reheat turbine 120. The high-temperature, high-pressure main steam from the secondary reheat boiler 110 enters the secondary reheat turbine 120 through the first main steam pipe 410, driving the turbine to perform work and converting thermal energy into mechanical energy.

[0028] The secondary reheat turbine 120 receives secondary reheat steam from the secondary reheat boiler 110 and converts its energy into mechanical energy. In this embodiment, the secondary reheat turbine 120 is preferably a single-shaft four-cylinder turbine, specifically comprising: an ultra-high pressure cylinder, a high pressure cylinder, an intermediate pressure cylinder, and a low pressure cylinder. The main shafts of the ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder, and low pressure cylinder are coaxially connected to each other.

[0029] A coupling 510 and a gearbox 520 are installed between the secondary reheat turbine 120 and the first feedwater pump 310 to regulate the speed of the first feedwater pump 310. Specifically, the front end of the main shaft of the secondary reheat turbine 120 is driven to the input shaft of the gearbox 520 via the coupling 510, and the output shaft of the gearbox 520 is driven to the main shaft of the first feedwater pump 310 via another coupling (not shown in the figure, but may be the same as 510), thus forming a structure in which the main turbine coaxially drives the feedwater pump. While performing work, the secondary reheat turbine 120 transmits its mechanical energy to the first feedwater pump 310 through the coupling 510 and the gearbox 520, driving the first feedwater pump 310 to operate. Thus, the secondary reheat unit 100 converts the energy of the secondary reheat steam into mechanical energy and can also drive the first feedwater pump 310 to supply water to the boiler.

[0030] The primary reheat boiler 210 generates high-temperature, high-pressure primary reheat steam. Its main steam outlet is connected to the steam inlet of the primary reheat turbine 220 via a second main steam pipe 420. Specifically, it is connected to the steam inlet of the high-pressure cylinder of the primary reheat turbine 220. The high-temperature, high-pressure main steam from the primary reheat boiler 210 enters the primary reheat turbine 220 through the second main steam pipe 420, driving the turbine to perform work.

[0031] The primary reheat turbine 220 receives primary reheat steam from the primary reheat boiler 210 and converts its energy into mechanical energy. In this embodiment, the primary reheat turbine 220 is preferably a single-shaft, three-cylinder turbine, specifically comprising a high-pressure cylinder, an intermediate-pressure cylinder, and a low-pressure cylinder. The main shafts of the high-pressure cylinder, the intermediate-pressure cylinder, and the low-pressure cylinder are coaxially connected to each other.

[0032] The outlet of the first feedwater pump 310 is connected to the inlet of the first feedwater header 430. The outlet of the first feedwater header 430 branches into two paths: the first path connects to the feedwater inlet of the secondary reheat boiler 110 via the first feedwater pipe 431, and the second path connects to the feedwater inlet of the primary reheat boiler 210 via the second feedwater pipe 432. The first feedwater pump 310 delivers pressurized feedwater to the first feedwater header 430, and then delivers it to the secondary reheat boiler 110 and the primary reheat boiler 210 via the first feedwater pipe 431 and the second feedwater pipe 432, respectively.

[0033] The outlet of the second feedwater pump 320 is connected to the inlet of the second feedwater header 440. The outlet of the second feedwater header 440 branches into two paths: one path connects to the feedwater inlet of the secondary reheat boiler 110 via the third feedwater pipe 441, and the other path connects to the feedwater inlet of the primary reheat boiler 210 via the fourth feedwater pipe 442. The second feedwater pump 320 delivers pressurized feedwater to the second feedwater header 440, and then delivers it to the secondary reheat boiler 110 and the primary reheat boiler 210 via the third feedwater pipe 441 and the fourth feedwater pipe 442, respectively.

[0034] The turbine system in this embodiment also includes a second feedwater pump turbine 230. The main shaft of the second feedwater pump turbine 230 is directly coaxially connected to the pre-pump of the second feedwater pump, and then driven by the main shaft of the second feedwater pump 320 through a gearbox, so that the second feedwater pump turbine 230 simultaneously drives the pre-pump and the second feedwater pump 320. The connection between the second feedwater pump turbine 230 and the second feedwater pump 320 through the gearbox allows for precise control of the feedwater power of the second feedwater pump 320. Furthermore, the steam supply to the second feedwater pump turbine 230 is provided by the fifth stage extraction steam of the secondary reheat turbine 120 and the fourth stage extraction steam of the primary reheat turbine 220.

[0035] Furthermore, the engine system also includes a first deaerator 610, a second deaerator 620, a pre-pump 330, and an electric pump 340.

[0036] The first deaerator 610 and the second deaerator 620 are used to remove dissolved oxygen from the feedwater, prevent corrosion of the boiler, pipelines and other components of the feedwater system, extend the service life of the equipment, ensure the safe and stable operation of the entire turbine system, and improve the thermal efficiency of the boiler.

[0037] A pre-pump 330 is located between the first deaerator 610 and the first feed water pump 310 to increase the inlet pressure of the first feed water pump 310.

[0038] Electric pump 340 is used to provide start-up feedwater to the secondary reheat boiler 110 and the primary reheat boiler 210 during the unit start-up phase.

[0039] The first deaerator 610 has two water supply outlets, and the second deaerator 620 has one water supply outlet.

[0040] The first water outlet of the first deaerator 610 and the water outlet of the second deaerator 620 are connected and then converged, and then connected to the inlet of the electric pump 340. The outlet of the electric pump 340 is divided into two paths: one path is connected to the water inlet of the secondary reheat boiler 110 and the primary reheat boiler 210 respectively, and together with the first water supply pipe 431, the second water supply pipe 432, the third water supply pipe 441 and the fourth water supply pipe 442, they form a water supply network.

[0041] The second water supply outlet of the first deaerator 610 is directly connected to the inlet of the pre-pump 330, enabling the first deaerator 610 to supply water to the pre-pump 330 independently. The outlet of the pre-pump 330 is connected to the inlet of the first water supply pump 310 to increase the water supply pressure and ensure stable water intake of the first water supply pump 310.

[0042] Through the above pipeline arrangement, the deaerated feedwater from the first deaerator 610 and the second deaerator 620 can be flexibly distributed to the boiler and feedwater pump, realizing water volume complementarity between deaerators and stable operation of the feedwater system.

[0043] Meanwhile, both the booster pump 330 and the electric pump 340 are frequency-adjustable centrifugal pumps, which have advantages such as compact structure, wide flow range, high efficiency, and easy maintenance. By adopting variable frequency speed control technology, the flow rate and head of the booster pump 330 and the electric pump 340 can be precisely controlled according to different needs during the unit's operating conditions and start-up phase. This allows for adjustment of the water supply ratio from different feedwater pumps to the secondary reheat boiler 110 and the primary reheat boiler 210, ensuring smooth unit start-up and switching of operating conditions.

[0044] This embodiment of the turbine system utilizes the main steam turbine to directly drive the feedwater pumps, replacing the traditional feedwater pump-turbine drive method. This significantly reduces power plant electricity consumption, improves overall thermal efficiency, and lowers operating costs. Furthermore, the turbine system, through feedwater pipeline diversion and dual deaerator configuration, achieves mutual supplementation of feedwater to the two deaerators and the two generating units. This effectively avoids problems such as insufficient water supply to a single unit or insufficient water volume in the deaerator, improving system reliability and flexibility, and ensuring safe and stable unit operation. An electric pump is also installed as a start-up feedwater pump, ensuring reliable feedwater supply during unit startup and improving startup success rate and efficiency. Both the booster pump and the electric pump are driven by variable frequency motors, enabling precise adjustment of feedwater flow according to unit operating conditions to meet different load demands and optimize operation control.

[0045] The following is a description of the operation method of the marine engine system in this embodiment:

[0046] If both the secondary reheat unit 100 and the primary reheat unit 200 are shut down, and it is necessary to start the secondary reheat unit 100 first, then the electric pump 340 should be started first to supply water to the secondary reheat boiler 110. After the secondary reheat boiler 110 is ignited and produces qualified steam, the secondary reheat turbine 120 should be started. Once the secondary reheat turbine 120 reaches its rated speed and is running stably, the first feedwater pump 310 should be started, and the electric pump 340 should be gradually shut down, switching the feedwater source to the first feedwater pump 310, which is coaxially driven by the secondary reheat turbine 120.

[0047] If it is necessary to start the reheat unit 200 first, then start the electric pump 340 to supply water to the reheat boiler 210. After the reheat boiler 210 is ignited and produces qualified steam, start the reheat turbine 220. When the reheat turbine 220 reaches its rated speed and operates stably, start the second feedwater pump turbine 230 and the second feedwater pump 320, and gradually shut down the electric pump 340, switching the feedwater source to the second feedwater pump 320 driven by the second feedwater pump turbine 230.

[0048] When the secondary reheat unit 100 is operating while the primary reheat unit 200 is shut down, if it is necessary to start the primary reheat unit 200, the feedwater from the secondary reheat unit 100 can be utilized. Start the second feedwater turbine 230 and the second feedwater pump 320, and adjust the feedwater ratio of the first feedwater pump 310 and the second feedwater pump 320 so that a portion of the feedwater enters the primary reheat boiler 210 through the second feedwater pipeline 432. After the primary reheat boiler 210 ignites and produces qualified steam, start the primary reheat turbine 220. As the primary reheat turbine 220 gradually increases its speed to its rated speed, adjust the flow rates of the first feedwater pump 310 and the second feedwater pump 320 to ultimately achieve stable coordinated operation of the two units.

[0049] Conversely, if the primary reheat unit 200 is operating while the secondary reheat unit 100 is shut down, and it is necessary to start the secondary reheat unit 100, the feedwater from the primary reheat unit 200 can be utilized. Start the pre-pump 330, adjust the feedwater ratio of the first feedwater pump 310 and the second feedwater pump 320, so that a portion of the feedwater enters the secondary reheat boiler 110 through the first feedwater pipe 431. After the secondary reheat boiler 110 ignites and produces qualified steam, start the secondary reheat turbine 120. As the secondary reheat turbine 120 gradually increases its speed to its rated speed, start the first feedwater pump 310, adjust the flow rates of the first feedwater pump 310 and the second feedwater pump 320, and ultimately achieve coordinated and stable operation of the two units.

[0050] Through the flexible switching of startup and operation modes described above, the turbine system of this utility model can adapt to different operating requirements, achieve energy-saving, efficient and reliable water supply, and improve the overall operating efficiency of the power plant.

[0051] The above description is merely an exemplary embodiment of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Those skilled in the art will readily conceive of embodiments of this disclosure upon considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described herein. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A turbosystem for a main steam turbine driving a water pump coaxially, characterized in that It includes a secondary reheat boiler, a secondary reheat turbine, a primary reheat boiler, a primary reheat turbine, a first feedwater pump, a second feedwater pump, and a second feedwater pump turbine; The main steam outlet of the secondary reheat boiler is connected to the steam inlet of the secondary reheat turbine. The main shaft of the secondary reheat turbine is driven to connect with the main shaft of the first feedwater pump through a coupling and a gearbox. The outlet of the first feedwater pump branches into a first feedwater pipe and a second feedwater pipe. The first feedwater pipe is connected to the feedwater inlet of the secondary reheat boiler, and the second feedwater pipe is connected to the feedwater inlet of the primary reheat boiler. The main steam outlet of the primary reheat boiler is connected to the steam inlet of the primary reheat turbine. The main shaft of the second feedwater pump turbine is driven to be connected to the main shaft of the second feedwater pump. The outlet of the second feedwater pump branches into a third feedwater pipe and a fourth feedwater pipe. The third feedwater pipe is connected to the feedwater inlet of the secondary reheat boiler, and the fourth feedwater pipe is connected to the feedwater inlet of the primary reheat boiler.

2. A turbosystem for a main steam turbine driving a water pump coaxially as claimed in claim 1, characterized in that The turbine system also includes a first deaerator and a second deaerator. The first feedwater outlet of the first deaerator and the feedwater outlet of the second deaerator are connected and then split into two paths, which are respectively connected to the feedwater inlets of the secondary reheat boiler and the primary reheat boiler. The second feedwater outlet of the first deaerator is connected to the inlet of the first feedwater pump.

3. A turbosystem for a main steam turbine coaxially driving a water pump as claimed in claim 2, characterized in that The turbine system also includes a booster pump, with the second feedwater outlet of the first deaerator connected to the inlet of the booster pump, and the outlet of the booster pump connected to the inlet of the first feedwater pump.

4. A main steam turbine coaxially driving pump turbine system as claimed in claim 2, wherein, The turbine system also includes an electric pump. The first feedwater outlet of the first deaerator and the feedwater outlet of the second deaerator are connected to the inlet of the electric pump. The outlet of the electric pump is divided into two paths, which are respectively connected to the feedwater inlets of the secondary reheat boiler and the primary reheat boiler.

5. A turbosystem for a main steam turbine coaxially driving a water pump as defined in claim 1, characterized in that The outlet of the first feedwater pump is connected to the inlet of the first feedwater header. The outlet of the first feedwater header is divided into two paths, which are respectively connected to the feedwater inlet of the secondary reheat boiler and the feedwater inlet of the primary reheat boiler through the first feedwater pipe and the second feedwater pipe.

6. A turbosystem for a main steam turbine driving a water pump coaxially as defined in claim 1, characterized in that The outlet of the second feedwater pump is connected to the inlet of the second feedwater header. The outlet of the second feedwater header is divided into two paths, which are connected to the feedwater inlet of the secondary reheat boiler and the feedwater inlet of the primary reheat boiler through the third feedwater pipe and the fourth feedwater pipe, respectively.

7. A main steam turbine coaxially driving pump turbine system as claimed in claim 3 wherein, The pre-pump is a centrifugal pump driven by a variable frequency motor.

8. A main steam turbine coaxially driving pump turbine system as claimed in claim 4 wherein, The electric pump is a centrifugal pump driven by a variable frequency motor.

9. A turbosystem for a main steam turbine driving a water pump coaxially as defined in claim 1, characterized in that The ultra-high pressure cylinder, high pressure cylinder, intermediate pressure cylinder, and low pressure cylinder of the reheat turbine are coaxially connected.

10. A turbosystem for a main steam turbine coaxially driving a water pump as defined in claim 1, characterized in that The high-pressure cylinder, intermediate-pressure cylinder, and low-pressure cylinder of the reheat turbine are coaxially connected.

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