Reheat steam turbine systems suitable for medium and low temperature and high temperature waste heat

Abstract

This utility model discloses a reheat steam turbine system suitable for medium-low temperature and high-temperature waste heat, including a waste heat boiler, a reheat steam turbine, a condenser, a feedwater system, an intermediate-pressure superheater, an intermediate-pressure steam drum, an intermediate-pressure cylinder, a condensate pre-filter, a condensate feedwater heat exchanger, an ion exchange purifier, and a condensate transfer pump. The inlet of the intermediate-pressure superheater is connected to the outlet of the intermediate-pressure steam drum, and the outlet of the intermediate-pressure superheater is connected to the steam inlet of the intermediate-pressure cylinder. The exhaust port of the intermediate-pressure cylinder is connected to the inlet of the reheater. In this way, high-temperature waste heat can be efficiently absorbed, allowing the high-parameter steam generated by the high-temperature waste heat to first enter the high-pressure cylinder to fully perform work. The discharged steam can enter the intermediate-pressure cylinder for further energy extraction, and then enter the reheater for heating, finally entering the low-pressure cylinder to complete the remaining work. This expands the adaptability range to heat source temperatures, and through the graded and cascaded utilization of high-grade heat energy, the overall thermal efficiency and power generation output of the system are significantly improved.

Description

Technical Field

[0001] This utility model relates to the technology of industrial waste heat recovery and utilization, and in particular to a reheat steam turbine system suitable for medium and low temperature and high temperature waste heat. Background Technology

[0002] Industrial waste heat resources encompass both medium- and low-temperature waste heat and high-temperature waste heat. They are an important secondary energy source in the industrial sector, and their efficient recovery and utilization are key pathways to achieving "dual carbon" goals and promoting energy conservation and emission reduction.

[0003] The prior art discloses a reheat steam turbine system for medium and low temperature waste heat, which has initially achieved waste heat recovery. The system completes the cycle of high-pressure work to reheat and low-pressure work of steam by cooperating with the high-pressure cylinder and low-pressure cylinder of the steam turbine through the high-pressure superheater, reheater and low-pressure superheater of the waste heat boiler, which solves the problem of medium and low temperature waste heat utilization to a certain extent.

[0004] However, the system has significant limitations when dealing with high-temperature waste heat, and the design flaws in its condensate reuse stage also restrict its overall performance. For example, the existing system only has a two-stage working structure with high-pressure and low-pressure cylinders. After the steam performs work in the high-pressure cylinder, it directly enters the reheater. It lacks an intermediate pressure stage to utilize the high enthalpy value of the high-temperature waste heat. High-temperature waste heat can generate steam with higher parameters (higher pressure and temperature). This steam still has a high residual energy after performing work in the high-pressure cylinder. The existing two-stage working mode with high pressure and low pressure cannot fully extract this part of energy, resulting in the high enthalpy value of the high-temperature waste heat not being effectively utilized. Secondly, the condensate is directly reused in the feedwater system after being condensed by the condenser, without any impurity removal stage. As a result, the condensate is easily mixed with suspended impurities such as metal oxides and dust carried by the steam during the circulation process. These impurities enter the steam drum and superheater of the waste heat boiler with the condensate, forming scale on the heat exchange surface, reducing heat exchange efficiency, and causing corrosion of boiler and turbine components, shortening the equipment life.

[0005] Furthermore, the system does not recover the waste heat carried by the condensate. After being cooled in the condenser, the condensate directly enters the feedwater system, resulting in the complete waste of its own heat.

[0006] Therefore, a new technical solution needs to be researched to address the above problems. Utility Model Content

[0007] In view of this, the present invention addresses the deficiencies of the existing technology and its main objective is to provide a reheat steam turbine system suitable for medium- and low-temperature and high-temperature waste heat. Through the structural design of the intermediate-pressure superheater, intermediate-pressure steam drum, and intermediate-pressure cylinder, it can efficiently absorb high-temperature waste heat. The high-parameter steam generated by the high-temperature waste heat first enters the high-pressure cylinder to fully perform work, and the discharged steam can enter the intermediate-pressure cylinder for further energy extraction. Then, it enters the reheater for heating and finally enters the low-pressure cylinder to complete the remaining work. This expands the adaptability range to heat source temperatures and significantly improves the overall thermal efficiency and power generation output of the system through the graded and cascaded utilization of high-grade thermal energy.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A reheat steam turbine system suitable for medium-low temperature and high-temperature waste heat includes a waste heat boiler, a reheat steam turbine, a high-pressure superheater, a reheater, a low-pressure superheater, a condenser, a high-pressure cylinder, a low-pressure cylinder, and a feedwater system. The steam inlet of the high-pressure cylinder is connected to the outlet of the high-pressure superheater, and the steam outlet of the high-pressure cylinder is connected to the inlet of the reheater. The steam outlet of the low-pressure cylinder is connected to the condenser through a low-pressure steam outlet pipe. The steam outlet of the high-pressure cylinder is connected to the condenser through a first high-pressure bypass pipe. The feedwater system is connected to both the waste heat boiler and the condenser.

[0010] It also includes a medium-pressure superheater, a medium-pressure steam drum, a medium-pressure cylinder, a condensate pre-filter, a condensate feedwater heat exchanger, an ion exchange purifier, and a condensate transfer pump;

[0011] The intermediate-pressure superheater is connected to the flue of the waste heat boiler. The inlet of the intermediate-pressure superheater is connected to the outlet of the intermediate-pressure steam drum, and the outlet of the intermediate-pressure superheater is connected to the steam inlet of the intermediate-pressure cylinder. The exhaust port of the intermediate-pressure cylinder is connected to the inlet of the reheater.

[0012] The condensate pre-filter has its inlet connected to the condensate outlet of the condenser to filter suspended impurities in the condensate.

[0013] The condensate feedwater heat exchanger has its shell-side inlet connected to the outlet of the condensate pre-filter, and its tube-side connected to the feedwater system.

[0014] The inlet of the ion exchange purifier is connected to the shell-side outlet of the condensate feedwater heat exchanger.

[0015] The condensate delivery pump has its inlet connected to the outlet of the ion exchange purifier, and its outlet connected to the water tank or deaerator inlet of the water supply system.

[0016] As a preferred embodiment, the steam inlet of the intermediate-pressure cylinder is equipped with an intermediate-pressure main steam valve and an intermediate-pressure regulating valve, and the exhaust pipe of the intermediate-pressure cylinder is equipped with an intermediate-exhaust check valve. The intermediate-exhaust check valve can prevent the steam in the reheater from flowing back into the intermediate-pressure cylinder (such as when the reheater pressure is momentarily higher than the exhaust pressure of the intermediate-pressure cylinder), thus avoiding the intermediate-pressure cylinder blades from reversing or the cylinder body from bearing reverse pressure, and at the same time preventing impurities carried by the reheat steam.

[0017] As a preferred embodiment, the reheater includes a high-temperature reheat section and a low-temperature reheat section. The exhaust port of the high-pressure cylinder is connected to the inlet of the low-temperature reheat section, and the exhaust port of the intermediate-pressure cylinder is connected to the inlet of the high-temperature reheat section. In this way, the exhaust steam from the intermediate-pressure cylinder and the high-pressure cylinder are received respectively for precise reheating, which effectively improves the superheat of the steam entering the low-pressure cylinder, significantly reduces the humidity of the exhaust steam from the low-pressure cylinder, reduces the risk of water erosion and corrosion of the last-stage blades, improves the equipment life and operational safety, and also improves the internal efficiency of the low-pressure cylinder due to the increased steam dryness.

[0018] As a preferred embodiment, the waste heat boiler is further equipped with a high-pressure steam drum and a low-pressure steam drum, with the inlet of the high-pressure superheater connected to the high-pressure steam drum; the inlet of the reheater is also connected to the outlet of the low-pressure superheater, and the inlet of the low-pressure superheater is connected to the low-pressure steam drum.

[0019] As a preferred embodiment, the system also includes a high-temperature feedwater preheating system, which comprises a high-pressure feedwater heater and a medium-pressure feedwater heater. The high-pressure feedwater heater is installed on the feedwater pipeline of the high-pressure steam drum, and the medium-pressure feedwater heater is installed on the feedwater pipeline of the medium-pressure steam drum.

[0020] As a preferred embodiment, the heat sources for the high-pressure feedwater heater and the medium-pressure feedwater heater are respectively derived from the extraction or exhaust of steam from the high-pressure cylinder and the medium-pressure cylinder.

[0021] Compared with the prior art, this utility model has significant advantages and beneficial effects. Specifically, as can be seen from the above technical solution, it mainly relies on the structural design of a medium-pressure superheater, a medium-pressure steam drum, and a medium-pressure cylinder. The inlet of the medium-pressure superheater is connected to the outlet of the medium-pressure steam drum, and the outlet of the medium-pressure superheater is connected to the steam inlet of the medium-pressure cylinder. The exhaust port of the medium-pressure cylinder is connected to the inlet of the reheater. In this way, high-temperature waste heat can be efficiently absorbed, allowing the high-parameter steam generated by the high-temperature waste heat to first enter the high-pressure cylinder to fully perform work. The discharged steam can then enter the medium-pressure cylinder for further energy extraction, and then enter the reheater for heating. Finally, it enters the low-pressure cylinder to complete the remaining work, expanding the range of heat source temperature adaptability. Through the graded and stepped utilization of high-grade thermal energy, the overall thermal efficiency and power generation output of the system are significantly improved.

[0022] Secondly, the design of the condensate pre-filter, condensate feedwater heat exchanger, ion exchange purifier, and condensate transfer pump enables the entire process of filtration, heat exchange, purification, and pressurization of condensate from the condenser outlet. The condensate feedwater heat exchanger utilizes the waste heat of the condensate to preheat the boiler feedwater, recovering low-temperature heat energy, reducing the load of extraction steam heating, and lowering the unit's heat consumption. The ion exchange purifier ensures that the quality of the recovered water meets boiler feedwater standards, reducing system makeup water volume and water treatment costs. The condensate transfer pump ensures that the purified condensate can be smoothly pumped into the feedwater system, thereby improving the overall system's water recovery rate and thermal economy.

[0023] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic flowchart of an embodiment of the present utility model;

[0025] Figure 2 This is a partial flowchart of an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached diagram:

[0027] 1. Waste heat boiler 2. Condenser

[0028] 3. Water supply system 4. Medium-pressure superheater

[0029] 5. Intermediate-pressure steam drum 6. Intermediate-pressure cylinder

[0030] 7. Condensate pre-filter; 8. Condensate feedwater heat exchanger

[0031] 9. Ion exchange purifier 10. Condensate transfer pump

[0032] 11. High-pressure superheater 12. Reheater

[0033] 13. Low-pressure superheater 14. High-pressure cylinder

[0034] 15. Low-pressure cylinder 16. High-pressure steam drum

[0035] 17. Low-pressure steam drum 18. Intermediate drain check valve. Detailed Implementation

[0036] Please refer to Figures 1 to 2 As shown, it illustrates the specific structure of an embodiment of the present invention.

[0037] In the description of this utility model, it should be noted that the directional terms such as "up", "down", "front", "back", "left", and "right" indicate the orientation and positional relationship based on the accompanying drawings or the orientation or positional relationship shown when wearing and using the device normally. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0038] A reheat steam turbine system suitable for medium-low temperature and high-temperature waste heat includes a waste heat boiler 1, a reheat steam turbine, a condenser 2, a feedwater system 3, an intermediate-pressure superheater 4, an intermediate-pressure steam drum 5, an intermediate-pressure cylinder 6, a condensate pre-filter 7, a condensate feedwater heat exchanger 8, an ion exchange purifier 9, and a condensate transfer pump 10.

[0039] The waste heat boiler 1 includes a high-pressure superheater 11, a reheater 12, and a low-pressure superheater 13 arranged sequentially; the reheat turbine includes a high-pressure cylinder 14 and a low-pressure cylinder 15, the steam inlet of the high-pressure cylinder 14 is connected to the outlet of the high-pressure superheater 11, and the steam outlet of the high-pressure cylinder 14 is connected to the inlet of the reheater 12; the steam outlet of the low-pressure cylinder 15 is connected to the condenser 2 through a low-pressure steam outlet pipe; the steam outlet of the high-pressure cylinder 14 is connected to the condenser 2 through a first high-pressure bypass pipe.

[0040] In this embodiment, the steam inlet parameters of the intermediate pressure cylinder 6 (24) are: pressure 2.5~4.0MPa, temperature 400~450℃; the steam inlet parameters of the high pressure cylinder 14 (8) are: pressure 3.0~5.0MPa, temperature 450~500℃.

[0041] Preferably, the waste heat boiler 1 is further provided with a high-pressure steam drum 16 and a low-pressure steam drum 17, and the inlet of the high-pressure superheater 11 is connected to the high-pressure steam drum 16; the inlet of the reheater 12 is also connected to the outlet of the low-pressure superheater 13, and the inlet of the low-pressure superheater 13 is connected to the low-pressure steam drum 17.

[0042] The water supply system 3 is connected to the waste heat boiler 1 and the condenser 2 respectively; the water supply system 3 includes at least a water tank and a deaerator.

[0043] The inlet of the intermediate-pressure superheater 4 is connected to the outlet of the intermediate-pressure steam drum 5, and the outlet of the intermediate-pressure superheater 4 is connected to the steam inlet of the intermediate-pressure cylinder 6; the exhaust port of the intermediate-pressure cylinder 6 is connected to the inlet of the reheater 12.

[0044] The condensate pre-filter 7 has its inlet connected to the condensate outlet of the condenser 2 to filter suspended impurities in the condensate; it can effectively intercept suspended impurities such as metal oxides and dust in the condensate (filtration accuracy can reach 5-10μm). Compared with the existing technology of directly reusing condensate, this avoids impurities from entering the high-pressure steam drum 16, medium-pressure steam drum 5, low-pressure steam drum 17 and various superheaters of the waste heat boiler 1 with the condensate, thus preventing scaling on the heat exchange surfaces.

[0045] The condensate feedwater heat exchanger 8 has its shell-side inlet connected to the outlet of the condensate pre-filter 7, and its tube-side connected to the feedwater system 3. By using counter-current heat exchange, the heat of the condensate (30-40°C) is transferred to the feedwater, raising the feedwater temperature to 28-38°C before it enters the steam drum. The condensate feedwater heat exchanger 8 adopts a shell-side and tube-side heat exchange structure. The shell side is filled with pre-filtered high-temperature condensate, and the tube side is filled with the water to be heated from the feedwater system 3.

[0046] Through heat exchange, the waste heat of the condensate can raise the water supply temperature by 20-30°C, reducing the water supply system's consumption of external heating energy (such as steam and electricity).

[0047] The inlet of the ion exchange purifier 9 is connected to the shell-side outlet of the condensate feedwater heat exchanger 8. The ion exchange purifier 9 can adsorb harmful ions such as calcium, magnesium, and chloride ions in the condensate, preventing these ions from forming scale in the boiler and corrosion products on the surface of the turbine blades.

[0048] The condensate delivery pump 10 has its inlet connected to the outlet of the ion exchange purifier 9, and its outlet connected to the water tank or deaerator inlet of the water supply system 3.

[0049] Preferably, the intermediate-pressure cylinder 6, high-pressure cylinder 14, and low-pressure cylinder 15 are arranged coaxially and sequentially separated by partitions. This partition separation results in a compact structure and reduces manufacturing and installation costs. The partitions should preferably be made of the same material as the high-pressure cylinder 14, intermediate-pressure cylinder 6, and low-pressure cylinder 15. The high-pressure cylinder 14 and low-pressure cylinder 15 are arranged in descending order of steam inlet parameters and are configured in reverse flow, meaning their steam inlet and outlet directions are inconsistent: high-pressure cylinder 14 is right-inlet and left-outlet, while low-pressure cylinder 15 is left-inlet and right-outlet. This arrangement can offset some of the expansion, improving the safety of the reheat turbine, and can be configured according to actual needs.

[0050] Preferably, the steam inlet of the intermediate pressure cylinder 6 is provided with an intermediate pressure main steam valve and an intermediate pressure regulating valve, and the exhaust pipe of the intermediate pressure cylinder 6 is provided with an intermediate exhaust check valve 18. The intermediate exhaust check valve 18 can block the backflow of steam in the reheater 12 into the intermediate pressure cylinder 6 (such as when the pressure of the reheater 12 is instantaneously higher than the exhaust pressure of the intermediate pressure cylinder 6), thus preventing the blades of the intermediate pressure cylinder 6 from reversing or the cylinder body from bearing reverse pressure, and at the same time preventing impurities carried by the reheat steam.

[0051] Preferably, the reheater 12 includes a high-temperature reheat section and a low-temperature reheat section. The exhaust port of the high-pressure cylinder 14 is connected to the inlet of the low-temperature reheat section, and the exhaust port of the intermediate-pressure cylinder 6 is connected to the inlet of the high-temperature reheat section. In this way, the exhaust steam from the intermediate-pressure cylinder 6 and the high-pressure cylinder 14 is received and precisely reheated, which effectively improves the superheat of the steam entering the low-pressure cylinder 15, significantly reduces the humidity of the exhaust steam from the low-pressure cylinder 15, reduces the risk of water erosion and corrosion of the last stage blades, improves the equipment life and operational safety, and also improves the internal efficiency of the low-pressure cylinder 15 due to the increased steam dryness.

[0052] Preferably, the system further includes a high-temperature feedwater preheating system, which comprises a high-pressure feedwater heater and a medium-pressure feedwater heater. The high-pressure feedwater heater is installed on the feedwater pipeline of the high-pressure steam drum 16, and the medium-pressure feedwater heater is installed on the feedwater pipeline of the medium-pressure steam drum 5. Preferably, the heat sources for the high-pressure feedwater heater and the medium-pressure feedwater heater are respectively derived from the extraction or exhaust steam of the high-pressure cylinder 14 and the medium-pressure cylinder 6.

[0053] The working principle of this embodiment is described in detail below:

[0054] It is divided into five stages:

[0055] I. High-Temperature Waste Heat Recovery and Medium-Pressure Power Cycle

[0056] When there is high-temperature waste heat in the system, the high-temperature part of the system starts to work. The feedwater system 3 supplies water to the intermediate-pressure steam drum 5. The saturated steam generated by the intermediate-pressure steam drum 5 enters the intermediate-pressure superheater 4 arranged in the flue of the waste heat boiler 1. After absorbing the waste heat of the high-temperature flue gas, it becomes intermediate-pressure superheated steam. The steam enters the intermediate-pressure cylinder 6 through the pipeline equipped with the intermediate-pressure main steam valve and the intermediate-pressure regulating valve to expand and do work, driving the generator to generate electricity. The intermediate-pressure exhaust steam after doing work is introduced into the high-temperature reheat section of the reheater 12 through the pipeline equipped with the intermediate exhaust check valve 18 for reheating.

[0057] II. Low- and Medium-Temperature Waste Heat Recovery and High-Pressure Power Cycle

[0058] The saturated steam generated by the high-pressure steam drum 16 enters the high-pressure superheater 11, absorbs the waste heat of the medium and low temperature flue gas and becomes high-pressure superheated steam. This steam enters the high-pressure cylinder 14 to expand and do work. After doing work, part of the high-pressure exhaust steam can be directly introduced into the condenser 2 through the first high-pressure exhaust bypass pipe under special operating conditions, while the other part of the mainstream low-temperature and low-pressure steam is introduced into the low-temperature reheat section of the reheater 12.

[0059] III. Reheat and Low-Pressure Power Cycle

[0060] Inside the reheater 12, the exhaust steam from the high-pressure cylinder 14 and the exhaust steam from the intermediate-pressure cylinder 6 absorb heat from the flue gas, raising their temperatures. The combined reheated steam (or the reheated steam from each cylinder and then combined) is sent to the low-pressure cylinder 15 to continue expanding and doing work, converting energy back into mechanical energy, thereby significantly improving the output power and efficiency of the entire unit. Finally, the exhaust steam from the low-pressure cylinder 15 enters the condenser 2 and is condensed into water.

[0061] IV. Deep recovery and energy cascade utilization of condensate

[0062] The purification and heat recovery process of the condensate from condenser 2 is as follows:

[0063] Filtration: Condensate first enters the condensate pre-filter 7 to remove suspended impurities and protect downstream equipment;

[0064] Heat exchange: The filtered condensate enters the shell side of the condensate-feed water heat exchanger and exchanges heat countercurrently with the ambient temperature feedwater from feedwater system 3 in the tube side. The waste heat of the condensate is used to preheat the boiler feedwater, and its own temperature is reduced, realizing the recovery of low-temperature heat and reducing the system heat consumption.

[0065] Purification: The cooled condensate enters the ion exchange purifier 9 to remove hardness ions such as calcium and magnesium, as well as metal ions, so that the water quality meets the boiler feedwater standards.

[0066] Delivery: The purified high-quality condensate is pressurized by the condensate delivery pump 10 and sent back to the water tank or deaerator inlet of the water supply system 3, thereby greatly reducing the system's water replenishment and water treatment costs, and completing the fully enclosed recycling of the working fluid.

[0067] V. Water supply preheating

[0068] To further improve efficiency, the high-temperature feedwater preheating system is put into operation. Part of the working steam extracted from the high-pressure cylinder 14 and the medium-pressure cylinder 6 is used as the heat source for the high-pressure feedwater heater and the medium-pressure feedwater heater, respectively, to further heat the feedwater before it enters the high-pressure steam drum 16 and the medium-pressure steam drum 5, thereby reducing the energy consumption required for the boiler to heat the water to saturation and forming a more efficient thermodynamic cycle.

[0069] The key design feature of this invention lies in its structural design of an intermediate-pressure superheater, an intermediate-pressure steam drum, and an intermediate-pressure cylinder. The inlet of the intermediate-pressure superheater is connected to the outlet of the intermediate-pressure steam drum, and the outlet of the intermediate-pressure superheater is connected to the steam inlet of the intermediate-pressure cylinder. The exhaust port of the intermediate-pressure cylinder is connected to the inlet of the reheater. This design allows for efficient absorption of high-temperature waste heat, enabling the high-parameter steam generated from the high-temperature waste heat to first enter the high-pressure cylinder to perform full work. The discharged steam can then enter the intermediate-pressure cylinder for further energy extraction, followed by reheating in the reheater, and finally entering the low-pressure cylinder to complete the remaining work. This expands the adaptability range to heat source temperatures and significantly improves the overall thermal efficiency and power generation output of the system through the graded and tiered utilization of high-grade thermal energy.

[0070] Secondly, the design of the condensate pre-filter, condensate feedwater heat exchanger, ion exchange purifier, and condensate transfer pump enables the entire process of filtration, heat exchange, purification, and pressurization of condensate from the condenser outlet. The condensate feedwater heat exchanger utilizes the waste heat of the condensate to preheat the boiler feedwater, recovering low-temperature heat energy, reducing the load of extraction steam heating, and lowering the unit's heat consumption. The ion exchange purifier ensures that the quality of the recovered water meets boiler feedwater standards, reducing system makeup water volume and water treatment costs. The condensate transfer pump ensures that the purified condensate can be smoothly pumped into the feedwater system, thereby improving the overall system's water recovery rate and thermal economy.

[0071] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A reheat steam turbine system suitable for medium-low temperature and high-temperature waste heat, comprising a waste heat boiler, a reheat steam turbine, a high-pressure superheater, a reheater, a low-pressure superheater, a condenser, a high-pressure cylinder, a low-pressure cylinder, and a feedwater system; wherein the steam inlet of the high-pressure cylinder is connected to the outlet of the high-pressure superheater, and the steam outlet of the high-pressure cylinder is connected to the inlet of the reheater; the steam outlet of the low-pressure cylinder is connected to the condenser via a low-pressure steam outlet pipe; the steam outlet of the high-pressure cylinder is connected to the condenser via a first high-pressure bypass pipe; and the feedwater system is connected to both the waste heat boiler and the condenser; characterized in that... : It also includes a medium-pressure superheater, a medium-pressure steam drum, a medium-pressure cylinder, a condensate pre-filter, a condensate feed water heat exchanger, an ion exchange purifier, and a condensate transfer pump; The intermediate-pressure superheater is connected to the flue of the waste heat boiler. The inlet of the intermediate-pressure superheater is connected to the outlet of the intermediate-pressure steam drum, and the outlet of the intermediate-pressure superheater is connected to the steam inlet of the intermediate-pressure cylinder. The exhaust port of the intermediate-pressure cylinder is connected to the inlet of the reheater. The condensate pre-filter has its inlet connected to the condensate outlet of the condenser to filter suspended impurities in the condensate. The condensate feedwater heat exchanger has its shell-side inlet connected to the outlet of the condensate pre-filter, and its tube-side connected to the feedwater system. The inlet of the ion exchange purifier is connected to the shell-side outlet of the condensate feedwater heat exchanger. The condensate delivery pump has its inlet connected to the outlet of the ion exchange purifier, and its outlet connected to the water tank or deaerator inlet of the water supply system.

2. The reheat steam turbine system suitable for medium and low temperature and high temperature waste heat according to claim 1, characterized in that: The steam inlet of the intermediate pressure cylinder is equipped with an intermediate pressure main steam valve and an intermediate pressure regulating valve, and the exhaust pipe of the intermediate pressure cylinder is equipped with an intermediate exhaust check valve.

3. The reheat steam turbine system suitable for medium and low temperature and high temperature waste heat according to claim 1, characterized in that: The reheater includes a high-temperature reheat section and a low-temperature reheat section. The exhaust port of the high-pressure cylinder is connected to the inlet of the low-temperature reheat section, and the exhaust port of the intermediate-pressure cylinder is connected to the inlet of the high-temperature reheat section.

4. The reheat steam turbine system suitable for medium and low temperature and high temperature waste heat according to claim 1, characterized in that: The waste heat boiler is also equipped with a high-pressure steam drum and a low-pressure steam drum. The inlet of the high-pressure superheater is connected to the high-pressure steam drum. The inlet of the reheater is also connected to the outlet of the low-pressure superheater. The inlet of the low-pressure superheater is connected to the low-pressure steam drum.

5. The reheat steam turbine system suitable for medium and low temperature and high temperature waste heat according to claim 4, characterized in that: It also includes a high-temperature feedwater preheating system, which includes a high-pressure feedwater heater and a medium-pressure feedwater heater. The high-pressure feedwater heater is installed on the feedwater pipeline of the high-pressure steam drum, and the medium-pressure feedwater heater is installed on the feedwater pipeline of the medium-pressure steam drum.

6. The reheat steam turbine system suitable for medium and low temperature and high temperature waste heat according to claim 5, characterized in that: The heat sources for the high-pressure feedwater heater and the medium-pressure feedwater heater are steam extraction or exhaust from the high-pressure cylinder and the medium-pressure cylinder, respectively.

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