Saturated steam power generation system for gradient utilization of waste heat steam

Abstract

The invention relates to the technical field of saturated steam power generation, in particular to a saturated steam power generation system for waste heat steam gradient utilization, and aims to improve waste heat recovery efficiency and system stability. The input end of the main steam-water separator is connected with a middle-high pressure waste heat steam source through a main steam inlet pipeline; the input end of the steam supplementing steam-water separator is connected with a low-pressure waste heat steam source through a steam supplementing inlet pipeline; the steam turbine comprises a high-pressure cylinder and a low-pressure cylinder; the high-pressure cylinder is connected with the output end of the main steam-water separator through a main steam pipeline, and the low-pressure cylinder is connected with the output end of the steam supplementing steam-water separator through a steam supplementing steam pipeline. The generator is connected with the steam turbine; a steam inlet of the condenser is connected with a steam exhaust port of the steam turbine through a steam exhaust pipeline, and a condensed water outlet is connected to a user point through a water return pipeline. And gradient utilization and collaborative operation are adopted in the system, and maximum utilization of steam energy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of saturated steam power generation, and in particular to a saturated steam power generation system with cascaded utilization of waste heat steam. Background Art

[0002] Against the backdrop of a global economic slowdown and profound industrial restructuring, the steel industry is facing unprecedented challenges. On the one hand, weak market demand and intensified competitive competition are shrinking the industry's overall profit margins. On the other hand, the deepening implementation of the dual-carbon strategy is placing higher demands on energy conservation and emission reduction in energy-intensive industries. The traditional extensive development model is unsustainable, and steel companies urgently need to achieve a green transformation through technological innovation to overcome resource and environmental constraints and enhance their overall competitiveness.

[0003] Traditional waste heat power generation systems have the following shortcomings: (1) Low steam utilization rate: The energy of low-pressure steam and exhaust steam is not fully utilized and is directly discharged or condensed, resulting in energy waste.

[0004] (2) Poor system stability: When the steam supply fluctuates (such as intermittent production of electric furnaces), the generator set is prone to shutdown, affecting continuous operation.

[0005] (3) High maintenance cost: Traditional condensate pumps and vacuum systems are inefficient and prone to cavitation or blockage, increasing the maintenance burden.

[0006] (4) Insufficient adaptability: It is difficult to flexibly respond to load changes, and the steam injection adjustment capability is limited. Summary of the Invention

[0007] The purpose of the present invention is to provide a saturated steam power generation system with cascade utilization of waste heat steam, thereby improving waste heat recovery efficiency and system stability.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a saturated steam power generation system with cascade utilization of waste heat steam, comprising: The main steam-water separator has its input end connected to the medium and high pressure waste heat steam source through the main steam inlet pipeline; The input end of the supplementary steam-water separator is connected to the low-pressure waste heat steam source through the supplementary steam inlet pipeline; A steam turbine, the steam turbine comprising a high-pressure cylinder and a low-pressure cylinder; the high-pressure cylinder is connected to the output end of the main steam-water separator via a main steam pipeline, and the low-pressure cylinder is connected to the output end of the supplementary steam-water separator via a supplementary steam pipeline; a generator connected to the steam turbine; The steam inlet of the condenser is connected to the exhaust port of the steam turbine through an exhaust pipeline, and the condensate outlet of the condenser is connected to the user point through a condensate supply pipeline.

[0009] Furthermore, a main steam combined steam valve is provided on the main steam pipeline, and the main steam combined steam valve is used to control the on-off and flow rate of steam on the main steam pipeline.

[0010] Furthermore, a low-pressure combined steam valve is provided on the supplementary steam pipeline, and the low-pressure combined steam valve is used to control the on-off and flow rate of steam on the supplementary steam pipeline.

[0011] Furthermore, the low-pressure cylinder is connected to the input end of the supplementary steam separator through a first exhaust branch and a second exhaust branch respectively, and the first exhaust branch and the second exhaust branch are in communication with the supplementary air inlet pipeline.

[0012] Furthermore, both the first exhaust branch and the second exhaust branch are provided with a check valve, and the check valve is used to prevent steam from flowing back, thereby ensuring that low-pressure steam flows into the supplemental steam-water separator in a one-way manner.

[0013] Furthermore, it also includes a pressure equalizing box, which is connected to the main steam inlet pipeline at the front end of the main steam-water separator through a main steam pipeline branch pipeline, and is used to extract steam from the main steam inlet pipeline as a sealing steam source; The pressure equalizing box is connected to the front steam seal and the rear steam seal of the steam turbine through a pressure equalizing pipeline, and is used to provide sealing steam to prevent steam leakage; The pressure equalizing tank is connected to the steam side of the condenser through a steam exhaust pipeline, and utilizes the pressure difference to discharge the excess steam into the condenser; The pressure equalizing tank is connected to the water side of the condenser through a drain pipe to discharge the condensed water into the hot well of the condenser.

[0014] Furthermore, a pressure regulating valve is provided on the branch pipeline of the main steam pipeline to control the steam pressure supplied to the pressure equalizing tank.

[0015] Furthermore, it includes a shaft seal heater, the steam side inlet of the shaft seal heater is connected to the shaft seal leakage port of the steam turbine through a shaft seal leakage pipeline, and the steam side inlet of the shaft seal heater is also connected to the gate stem leakage ports of the main steam combined steam valve and the supplemental steam combined steam valve through a valve leakage pipeline to obtain a heating heat source; The water side inlet of the shaft seal heater is connected to the condensate pump outlet of the condenser through the condensate heating pipeline main line and the condensate heating pipeline bypass; The steam side outlet of the shaft seal heater is connected to the shaft fan, and the exhaust steam after heat exchange is discharged to the outside atmosphere through the exhaust pipeline.

[0016] Furthermore, the condenser is connected to a water ring vacuum pump, and the water ring vacuum pump is connected to the exhaust port of the condenser through an exhaust pipeline to maintain the vacuum state of the condenser.

[0017] Furthermore, the condenser is externally connected to a rubber ball pump assembly, which includes a rubber ball pump and a ball collecting net for automatically cleaning the condenser heat exchange tubes. Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art: The saturated steam power generation system of the present invention with cascade utilization of waste heat steam realizes the cascade utilization of medium- and high-pressure steam and low-pressure steam through the two-stage separation design of the main steam steam-water separator and the supplementary steam steam-water separator, in conjunction with the staged work of the high-pressure cylinder and the low-pressure cylinder. The thermal efficiency of the system is significantly improved compared with the traditional single-stage power generation system.

[0018] The main steam after work is introduced into the steam turbine for the second time and drives the turbine together with the external supplementary steam to work, which improves the steam utilization rate while controlling the coordinated regulation of the main steam and supplementary steam, enhances the load adaptability of the unit, and thus reduces the power generation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings: Figure 1 This is a planar diagram of a saturated steam power generation system with cascaded utilization of waste heat steam provided by the present invention; Figure 2 This is a system flow chart of a saturated steam power generation system with cascaded utilization of waste heat steam provided by the present invention; Figure 3 A steam cascade utilization flow chart of a saturated steam power generation system with cascade utilization of waste heat steam provided by the present invention; The accompanying drawings are numerals as follows: 1. Main steam water separator; 10. Main steam inlet pipeline; 11. Main steam pipeline; 110. Main steam combined steam valve; 12. Safety steam pipeline; 2. Supplemental steam-water separator; 20. Supplemental steam inlet pipeline; 21. Supplemental steam pipeline; 210. Low-pressure combined steam valve; 3. Steam turbine; 30. First exhaust branch; 31. Second exhaust branch; 301. High-pressure cylinder; 302. Low-pressure cylinder; 303. Check valve; 4. Generator; 5. Condenser; 50. Exhaust pipe; 51. Condensate supply pipe; 6. Pressure equalizing tank; 60. Main steam pipeline branch line; 601. Pressure regulating valve; 61. Pressure equalizing pipeline; 62. Exhaust pipeline; 63. Drain pipeline; 7. Shaft seal heater; 70. Shaft seal leakage pipeline; 71. Valve leakage pipeline; 72. Condensate heating pipeline main line; 73. Condensate heating pipeline bypass; 74. Exhaust pipeline; 75. Condensate return pipeline; 8. Water ring vacuum pump; 80. Exhaust pipeline. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] See Figure 1 A saturated steam power generation system with cascaded utilization of waste heat steam of the present invention includes a main steam steam-water separator 1, a supplementary steam steam-water separator 2, a steam turbine 3, a generator 4 and a condenser 5.

[0022] Specifically, see Figures 1 to 3 One end (i.e., the input end) of the main steam-water separator 1 is connected to the medium and high pressure waste heat steam source through the main steam inlet pipeline 10, and then the external waste heat steam source is introduced into the separator for steam-water separation, aiming to separate the water carried in the steam from the steam to ensure the dryness of the steam.

[0023] In this example, supplemental steam separator 2 is installed in parallel with main steam separator 1. Its input is connected to an external low-pressure waste heat steam source via supplemental steam inlet line 20, and it also receives low-pressure steam generated by steam turbine 3 after power generation. This dual-source design significantly improves the system's efficiency in recovering low-grade thermal energy.

[0024] The steam turbine 3 includes a high-pressure cylinder 301 and a low-pressure cylinder 302. The high-pressure cylinder 301 is connected to the output end of the main steam separator 1 via the main steam line 11, and the low-pressure cylinder 302 is connected to the output end of the supplemental steam separator 2 via the supplemental steam line 21. The purpose is to convert steam thermal energy into mechanical energy.

[0025] The main steam line 11 is equipped with a main steam combined steam valve 110, which integrates flow regulation, pressure balancing, and emergency shutoff functions, allowing real-time adjustment of steam flow based on system load. Similarly, the supplemental steam line 21 is equipped with a low-pressure combined steam valve 210, which controls the flow rate and on / off of steam in the supplemental steam line 21.

[0026] By connecting the steam separator to the steam turbine 3, the steam pressure and heat energy output from the steam separator is converted into mechanical energy through the steam turbine 3, driving the rotor in the steam turbine 3 to rotate at high speed. Furthermore, because the steam turbine 3 is coaxially connected to the generator 4, the steam turbine 3 can drive the generator 4 to generate electricity, thus achieving the initial conversion of steam thermal energy into electrical energy.

[0027] After steam turbine 3 operates, the exhaust steam pressure drops significantly, forming low-pressure steam. To avoid wasting this steam resource, in this example, this steam is combined with external low-pressure supplemental air and fed into the aforementioned supplemental steam separator 2 for secondary water separation and subsequent energy conversion.

[0028] The low-pressure steam exhausted from the steam turbine 3 is discharged from the low-pressure cylinder 302 through a first exhaust branch 30 and a second exhaust branch 31. These first and second exhaust branches 30, 31 are connected to the aforementioned supplemental air inlet pipeline 20. Check valves 303 are provided on each of the first and second exhaust branches 30, 31 to prevent the low-pressure steam from flowing back into the steam turbine 3, ensuring that the low-pressure steam generated by the steam turbine 3 flows unidirectionally into the supplemental steam separator 2.

[0029] In this example, a condenser 5 is also provided, and its steam inlet is connected to the exhaust port of the steam turbine 3 through an exhaust pipe 50. The exhaust steam generated after multiple stages of work in the steam turbine 3 has its energy basically fully utilized. At this time, it can enter the condenser 5 through the exhaust pipe 50 for cooling. In the condenser 5, the exhaust steam exchanges heat with the cooling water, and is quickly cooled and condensed into water. The condensed water is then transported to the user point through the return pipe 51. In this example, the water can be sent to the desalted water network as a high-quality water source for use in other production links; it can also be transported to the electric furnace to achieve the recycling of water resources and reduce the water resource consumption of the system.

[0030] The saturated steam power generation system in this example also includes a pressure equalizing tank 6. The pressure equalizing tank 6 stabilizes the steam pressure in the system by collecting and distributing steam, balancing the pressure in various parts of the system, ensuring stable steam parameters and creating favorable conditions for the stable operation of the steam turbine 3.

[0031] Specifically, the pressure-equalizing tank 6 is connected to the main steam inlet pipe 10 at the front end of the main steam separator 1 via a main steam pipe branch line 60. It is used to extract steam from the main steam inlet pipe 10 as a sealing steam source. The pressure-equalizing tank 6 is connected to the front and rear steam seals of the steam turbine 3 via a pressure-equalizing pipe 61, forming a bidirectional sealing protection, providing sealing steam and effectively preventing steam leakage.

[0032] In addition, to ensure system pressure balance, the equalizing tank 6 is also connected to the steam side of the condenser 5 through the steam discharge pipeline 62, and then uses the pressure difference to discharge excess steam into the condenser 5. The equalizing tank 6 is also connected to the water side of the condenser 5 through the drain pipeline 63 to discharge the condensed water into the hot well of the condenser 5, realizing closed-loop recovery of the condensed water.

[0033] The aforementioned main steam pipeline branch pipeline 60 is provided with a pressure regulating valve 601 for controlling the steam pressure supplied to the equalizing tank 6. The steam discharge pipeline 62 is equipped with a check valve to ensure one-way flow of steam and prevent steam in the condenser 5 from flowing back to the equalizing tank 6; the drain pipeline 63 uses a drain regulating valve to adjust the amount of drain according to the water level of the condenser 5. This multi-stage linkage pressure balance design enables the system to maintain stable sealing pressure when the load fluctuates, greatly improving the operation reliability of the unit.

[0034] In this example, a shaft seal heater 7 is also provided. The shaft seal heater 7 is used to recover the heat of the shaft seal leakage steam of the steam turbine 3 and heat the condensed water, improving the thermal efficiency of the system and preventing steam leakage from affecting the environment and equipment.

[0035] Specifically, the shaft seal heater 7 adopts a double heat source input design, with the steam side inlet connected to the shaft seal leakage port of the steam turbine through the shaft seal leakage pipeline 70 to recover the shaft seal steam, and the steam side inlet of the shaft seal heater 7 connected to the medium-pressure leakage steam in the gate rod leakage port of the aforementioned main steam combined steam valve 110 and the supplementary steam combined steam valve 210 through the valve leakage pipeline 71 to obtain the heating heat source.

[0036] The water side inlet of the shaft seal heater 7 is connected to the outlet of the aforementioned condensed water pump of the condenser 5 through the condensed water heating pipeline main line 72 and the condensed water heating pipeline bypass 73, which can heat the condensed water. The heated water is output in two ways: one is sent to the desalted water pipeline network as high-quality make-up water, and the other is supplied to the desalted water tank of the electric furnace to realize water resource recycling.

[0037] The aforementioned condensed water pump adopts a barrel bag type condensed water pump, which has good anti-cavitation performance compared with the traditional horizontal type condensed water pump. The first stage impeller of the barrel bag type condensed water pump is usually placed at the lower part of the pump cylinder, at a relatively low position, which can make the impeller inlet obtain a higher static pressure, effectively improving the anti-cavitation performance of the pump, and is suitable for conveying condensed water in a vacuum and saturated state. The installation position of the horizontal type condensed water pump is relatively high, and the first stage impeller is prone to cavitation.

[0038] The barrel bag type condensate pump has high operation stability. Since it is a vertical structure, the pump shaft is arranged vertically, the center of gravity of the rotor component coincides with the center line of the shaft, and the vibration during operation is small. At the same time, the barrel bag type condensate pump usually adopts a multi-stage impeller arranged in the same direction, the axial force is well balanced, the axial force can be balanced by a balance drum or the like, and the operation is more stable. In contrast, the rotor component of the horizontal type condensate pump is in a horizontal position, is prone to vibration due to the deviation of the center of gravity and the like, and affects the operation stability.

[0039] In addition, the barrel bag type condensate pump generally adopts a core-pulling structure, and the pump core can be pulled out as a whole during maintenance, without the need to disassemble the outer cylinder of the pump and the connecting pipeline, thereby reducing the maintenance workload and time. During maintenance of the horizontal type condensate pump, a large number of pipelines and components usually need to be disassembled, a large maintenance space is required, and maintenance is relatively complex.

[0040] The vertical structure of the barrel bag type condensate pump has a small footprint, and is particularly suitable for installation in places with limited space. The horizontal type condensate pump is placed horizontally, and requires a large installation space, which may be limited in some power plants with limited space.

[0041] In addition, the steam side outlet of the shaft seal heater 7 is connected to a shaft fan, and the exhaust steam after heat exchange is discharged to the outside atmosphere through an exhaust pipeline 74. The shaft seal heater 7 is also connected to a condensate return pipeline 75, which returns the condensate to the condenser 5.

[0042] In this example, the condenser 5 is connected to a water ring vacuum pump 8, and the vacuum pump is connected to the exhaust port of the condenser 5 through an exhaust pipeline 80 to maintain the vacuum state of the condenser 5. By maintaining the vacuum environment in the condenser 5, the condensing temperature of the exhaust steam can be reduced, the work capacity of the steam can be improved, and the efficiency of the entire power generation system can be improved.

[0043] The sealing space formed between the impeller and the water ring of the water ring vacuum pump 8 can more effectively extract gas, and under the same working conditions, its gas extraction capacity is usually stronger than that of a water jet steam extractor, and it can more quickly establish and maintain the vacuum of the condenser. The power consumption of the water ring vacuum pump 8 is relatively low, especially when operating at partial load, its efficiency changes little, and it can automatically adjust according to the actual working condition. Compared with the water jet steam extractor, the power consumption can be effectively reduced, and the overall economy of the unit can be improved.

[0044] In addition, the water ring vacuum pump 8 has a relatively simple structure, fewer internal moving parts, and does not require a large amount of water jet during operation, thereby reducing the corrosion and wear problems of related pipelines and equipment, and thus the maintenance workload and cost are low, and the reliability and service life of the equipment are relatively high. It has low water quality requirements and is more adaptable, and can reduce equipment failures caused by water quality problems.

[0045] Condenser 5 is also connected to a ball pump assembly (not shown), specifically comprising a ball pump and a ball collection net. By dropping balls into the heat exchange tubes of condenser 5, friction between the balls and the inner walls of the tubes effectively removes dirt and impurities, ensuring cleanliness and maintaining good heat exchange.

[0046] In this example, a safety steam line 12 is also installed, which plays a crucial role. When the electric furnace is not producing, the main steam supply is reduced. This safety steam line provides a stable steam source for the system, maintaining low-load operation of saturated steam power generation. This ensures continuous operation of the generator set and avoids equipment damage caused by frequent starts and stops. When the electric furnace resumes production and the main steam supply is sufficient, main steam usage can be gradually increased, increasing the power generation load and fully utilizing industrial waste heat for efficient power generation.

[0047] In summary, the saturated steam power generation system disclosed in this invention utilizes waste heat steam in a cascaded manner, simultaneously utilizing medium- and high-pressure main steam (waste heat from electric furnaces and converters) and low-pressure supplemental steam (turbine exhaust steam plus external low-grade steam) to maximize heat recovery. The main steam first enters the high-pressure cylinder to perform work, while the low-pressure steam enters the low-pressure cylinder for a second time to continue expanding, fully utilizing the steam energy.

[0048] The main steam combined steam valve, low-pressure combined steam valve and check valve are controlled in a coordinated manner to flexibly match load requirements.

[0049] The water ring vacuum pump maintains a high vacuum, lowering the exhaust steam condensation temperature and increasing turbine output. The ball pump's automatic cleaning system prevents scaling of the heat exchange tubes, maintaining efficient heat exchange and minimizing maintenance downtime. Condensate is reused in the electric furnace or demineralized water network, reducing water consumption.

[0050] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A saturated steam power generation system with cascade utilization of waste heat steam, characterized in that: include: A main steam-water separator (1), the input end of which is connected to a medium- and high-pressure waste heat steam source via a main steam inlet pipeline (10); A supplementary steam-water separator (2), the input end of which is connected to a low-pressure waste heat steam source via a supplementary steam inlet pipe (20); A steam turbine (3), the steam turbine (3) comprising a high-pressure cylinder (301) and a low-pressure cylinder (302); the high-pressure cylinder (301) is connected to the output end of the main steam-water separator (1) via a main steam pipeline (11), and the low-pressure cylinder (302) is connected to the output end of the supplementary steam-water separator (2) via a supplementary steam pipeline (21); A generator (4), the generator (4) being connected to the steam turbine (3); The steam inlet of the condenser (5) is connected to the exhaust port of the steam turbine (3) through an exhaust pipe (50), and the condensate outlet of the condenser (5) is connected to the user point through a condensate supply pipe (51).

2. A saturated steam power generation system with cascaded utilization of waste heat steam according to claim 1, characterized in that: The main steam pipeline (11) is provided with a main steam combined steam valve (110), and the main steam combined steam valve (110) is used to control the on / off and flow rate of steam on the main steam pipeline (11).

3. The saturated steam power generation system with cascade utilization of waste heat steam according to claim 1, characterized in that: A low-pressure combined steam valve (210) is provided on the supplementary steam pipeline (21), and the low-pressure combined steam valve (210) is used to control the on / off and flow rate of steam on the supplementary steam pipeline (21).

4. The saturated steam power generation system with cascaded utilization of waste heat steam according to claim 1, characterized in that: The low-pressure cylinder (302) is connected to the input end of the supplementary steam-water separator (2) via a first exhaust branch (30) and a second exhaust branch (31), respectively, and the first exhaust branch (30) and the second exhaust branch (31) are in communication with the supplementary air inlet pipeline (20).

5. The saturated steam power generation system with cascade utilization of waste heat steam according to claim 4, characterized in that: Both the first exhaust branch (30) and the second exhaust branch (31) are provided with a check valve (303). The check valve (303) is used to prevent steam from flowing back, thereby ensuring that low-pressure steam flows into the supplementary steam-water separator (2) in a one-way manner.

6. The saturated steam power generation system with cascaded utilization of waste heat steam according to claim 1, characterized in that: It also includes a pressure equalizing box (6), which is connected to the main steam inlet pipeline (10) at the front end of the main steam steam-water separator (1) through a main steam pipeline branch pipeline (60) and is used to extract steam from the main steam inlet pipeline (10) as a sealing steam source; The pressure equalizing box (6) is connected to the front steam seal and the rear steam seal of the steam turbine (3) via a pressure equalizing pipeline (61) to provide sealing steam to prevent steam leakage; The pressure equalizing tank (6) is connected to the steam side of the condenser (5) via a steam exhaust pipeline (62), and utilizes the pressure difference to exhaust excess steam into the condenser (5); The pressure equalizing tank (6) is connected to the water side of the condenser (5) via a drain pipe (63) to discharge the condensed water into the hot well of the condenser (5).

7. A saturated steam power generation system with cascaded utilization of waste heat steam according to claim 6, characterized in that: A pressure regulating valve (601) is provided on the main steam pipeline branch line (60) for controlling the steam pressure supplied to the pressure equalizing tank (6).

8. The saturated steam power generation system with cascaded utilization of waste heat steam according to claim 1, characterized in that: It also includes a shaft seal heater (7), wherein the steam side inlet of the shaft seal heater (7) is connected to the shaft seal leakage port of the steam turbine (3) through a shaft seal leakage pipeline (70), and the steam side inlet of the shaft seal heater (7) is also connected to the gate rod leakage ports of the main steam combined steam valve (110) and the supplementary steam combined steam valve (210) through a valve leakage pipeline (71) to obtain a heating heat source; The water side inlet of the shaft seal heater (7) is connected to the condensate pump outlet of the condenser (5) through the condensate heating pipeline main line (72) and the condensate heating pipeline bypass (73); The steam side outlet of the shaft seal heater (7) is connected to the shaft fan, and the exhaust steam after heat exchange is discharged to the outside atmosphere through the exhaust pipe (74).

9. The saturated steam power generation system with cascaded utilization of waste heat steam according to claim 1, characterized in that: The condenser (5) is connected to a water ring vacuum pump (8), and the water ring vacuum pump (8) is connected to the exhaust port of the condenser (5) through an exhaust pipe (80) to maintain the vacuum state of the condenser (5).

10. The saturated steam power generation system with cascaded utilization of waste heat steam according to claim 1, characterized in that: The condenser (5) is externally connected to a rubber ball pump assembly, which comprises a rubber ball pump and a ball collecting net and is used for cleaning the condenser heat exchange tubes.

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