Steam turbine exhaust self-pressurization waste heat recovery and utilization system

Abstract

This utility model belongs to the field of waste heat recovery and utilization technology. A steam turbine exhaust self-pressurization waste heat recovery and utilization system includes a first pipeline, a condenser, a second pipeline, a condensate pump, a third pipeline, a heater, a fourth pipeline, and a fifth pipeline; its key feature is that it also includes a condensing turbine exhaust self-pressurization waste heat recovery device, which includes a pressurization and heating unit and a phase change heating unit. The mixed steam output port of the pressurization and heating unit is connected to the mixed steam input port of the phase change heating unit; the exhaust steam inlet of the pressurization and heating unit is connected to the first pipeline via a sixth pipeline and a tee pipe; the power steam inlet of the pressurization and heating unit is connected to the low-pressure steam outlet of the steam turbine via a seventh pipeline. This system recovers and utilizes a portion of the steam turbine's exhaust heat, reducing the heat carried by the circulating cooling water and lowering carbon emissions.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery and utilization technology, specifically relating to a steam turbine exhaust self-pressurization waste heat recovery and utilization system. Background Technology

[0002] Currently, all exhaust steam from the plant's pure condensing turbines is condensed in the condenser via circulating cooling water, and the released latent heat of vaporization is also discharged into the atmosphere via the circulating cooling water, resulting in heat waste and increased carbon emissions caused by energy consumption. Summary of the Invention

[0003] The purpose of this invention is to provide a steam turbine exhaust self-pressurization waste heat recovery and utilization system. This system recovers and utilizes a portion of the exhaust heat from the steam turbine, reducing the heat carried by the circulating cooling water and lowering carbon emissions.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is a steam turbine exhaust steam self-pressurization waste heat recovery and utilization system, comprising a first pipe, a condenser, a second pipe, a condensate pump, a third pipe, a heater, a fourth pipe, and a fifth pipe; one end of the first pipe is connected to the exhaust steam outlet of the steam turbine, and the other end of the first pipe is connected to the exhaust steam inlet of the condenser; the low-temperature condensate outlet of the condenser is connected to the low-temperature condensate inlet of the heater via the second pipe, and a condensate pump is installed on the second pipe; one end of the third pipe is connected to the low-pressure steam outlet of the steam turbine, and the other end of the third pipe is connected to the low-pressure steam inlet of the heater; the steam condensate outlet of the heater is connected to the fifth pipe, and the low-temperature condensate of the heater is connected to the fourth pipe; the system is characterized by further comprising a condensate pump... The turbine exhaust steam self-pressurization waste heat recovery device includes a pressurization and heating unit and a phase change heating unit. The mixed steam output port of the pressurization and heating unit is connected to the mixed steam input port of the phase change heating unit. The exhaust steam inlet of the pressurization and heating unit is connected to the first pipe via a sixth pipe and a tee pipe. The power steam inlet of the pressurization and heating unit is connected to the low-pressure steam outlet of the turbine via a seventh pipe. The mixed steam condensate outlet of the phase change heating unit is connected to the condensate collection tank inlet of the condenser via an eighth pipe. The low-temperature condensate inlet of the phase change heating unit is connected to the second pipe via a tenth pipe and a tee pipe. The low-temperature condensate outlet of the phase change heating unit is connected to one end of the ninth pipe, and the other end of the ninth pipe is connected to the second pipe via a tee pipe.

[0005] Furthermore, the pressurization and heating unit includes a pressurization and heating unit housing, a Laval nozzle, and a Venturi tube. The pressurization and heating unit housing is hollow. A power steam inlet is provided at the left end of the pressurization and heating unit housing, a mixed steam outlet is provided at the right end of the pressurization and heating unit housing, and an exhaust steam inlet is provided at the bottom left end of the pressurization and heating unit housing. The Laval nozzle and the Venturi tube are both located inside the hollow cavity of the pressurization and heating unit housing and are fixed to the pressurization and heating unit housing. The Laval nozzle is located to the left of the Venturi tube. The inlet of the Laval nozzle is connected to the power steam inlet at the left end of the pressurization and heating unit housing, and the outlet of the Laval nozzle is located at the inlet of the Venturi tube. The outlet of the Venturi tube is connected to the mixed steam outlet at the right end of the pressurization and heating unit housing. The phase change heating unit includes a phase change heating unit shell, phase change heat pipes, a lower half-end head for low-temperature condensate inlet, an upper half-end head for low-temperature condensate outlet, and a partition between the upper and lower half-end heads. The phase change heating unit shell is hollow, and the central region inside the shell is a steam phase change zone. Phase change heat pipes, which are U-shaped heat exchange tube bundles, are installed within this zone. The inlet end of each heat pipe is connected to the low-temperature condensate inlet of the lower half-end head at the right end of the phase change heating unit shell, and the outlet end of each heat pipe is connected to the phase change heating unit shell. The low-temperature condensate outlet at the right end of the body is connected to the low-temperature condensate outlet of the upper half-end head. The left end of the phase change heating unit shell is provided with a mixed steam inlet, which is connected to the mixed steam outlet of the pressure-boosting and heating unit via the eleventh pipe. The low-temperature condensate inlet at the right end of the phase change heating unit shell is provided with a low-temperature condensate inlet on the lower half-end head. The low-temperature condensate outlet at the right end of the phase change heating unit shell is provided with a low-temperature condensate outlet on the upper half-end head. A condensate tank is provided at the bottom middle part of the phase change heating unit shell, and a mixed steam condensate outlet is provided at the condensate tank.

[0006] Furthermore, the pressurization and heating unit and the phase change heating unit of the condensing turbine exhaust self-pressurization waste heat recovery device are integrated into one structure; the pressurization and heating unit and the phase change heating unit share a single integral shell, the integral shell is hollow, and a support partition is fixed in the middle of the cavity of the integral shell. The left side of the support partition is the pressurization and heating unit, and the right side of the support partition is the phase change heating unit; the support partition is provided with a through hole through which the output end of the Venturi tube passes. The pressurization and heating unit includes a Laval nozzle and a Venturi tube. The left end of the integral shell is provided with a power steam inlet, and the bottom left end of the integral shell is provided with a waste steam inlet. The Laval nozzle and Venturi tube are both located in the cavity on the left side of the integral shell and are fixed to the integral shell. The Laval nozzle is located to the left of the Venturi tube. The inlet of the Laval nozzle is connected to the power steam inlet at the left end of the integral shell. The outlet of the Laval nozzle is located at the inlet of the Venturi tube. The output end of the Venturi tube passes through the through hole on the support partition. The mixed steam outlet of the Venturi tube is connected to the phase change heating unit. The phase change heating unit includes a phase change heat pipe, a lower half-head for low-temperature condensate inlet, an upper half-head for low-temperature condensate outlet, and a partition between the upper and lower half-heads. The central area of ​​the right side of the integral shell is a steam phase change zone, in which a phase change heat pipe is installed. The phase change heat pipe is a U-shaped heat exchange tube bundle. The inlet end of the phase change heat pipe is connected to the low-temperature condensate inlet of the lower half-head for low-temperature condensate inlet at the right end of the integral shell, and the outlet end of the phase change heat pipe is connected to the low-temperature condensate outlet of the upper half-head for low-temperature condensate outlet at the right end of the integral shell. The lower half-head for low-temperature condensate inlet at the right end of the integral shell is provided with a low-temperature condensate inlet, and the upper half-head for low-temperature condensate outlet at the right end of the integral shell is provided with a low-temperature condensate outlet. A condensate tank is provided at the bottom center of the right side of the integral shell, and a mixed steam condensate outlet is provided at the condensate tank.

[0007] The beneficial effects of this utility model are: this utility model can recover and utilize the waste heat of part of the exhaust steam of the condensing turbine through the self-pressurization waste heat recovery device, thereby reducing the heat carried by the circulating cooling water and reducing carbon emissions. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of the steam turbine exhaust self-pressurization waste heat recovery and utilization system of this utility model.

[0009] Figure 2 This is a schematic diagram of the condensing turbine exhaust steam self-pressurization waste heat recovery device according to Embodiment 1 of this utility model.

[0010] Figure 3 This is a schematic diagram of the condensing turbine exhaust steam self-pressurization waste heat recovery device according to Embodiment 2 of this utility model.

[0011] In the diagram: 1-Steam turbine, 2-First pipe, 3-Condenser, 4-Second pipe, 5-Condensate pump, 6-Third pipe, 7-Heater, 8-Fourth pipe, 9-Fifth pipe, 10-Sixth pipe, 11-Seventh pipe, 12-Condenser exhaust steam self-pressurization waste heat recovery device, 13-Pressure boosting and heating unit, 14-Phase change heating unit, 15-Eighth pipe, 16-Ninth pipe, 17-Tenth pipe, 18-Circulating cooling water inlet 19-Circulating cooling water outlet, 20-Pressure boosting and heating unit shell, 21-Laval nozzle, 22-Venturi tube, 23-Eleventh pipe, 24-Phase change heating unit shell, 25-Steam phase change zone, 26-Phase change heat pipe, 27-Condensate tank, 28-Lower half-head of low-temperature condensate inlet, 29-Baffle between upper and lower half-head, 30-Upper half-head of low-temperature condensate outlet, 31-Integral shell, 32-Support baffle. Detailed Implementation

[0012] Example 1 (split type): like Figure 1 , Figure 2As shown, the turbine exhaust steam self-pressurization waste heat recovery and utilization system includes a first pipe 2, a condenser 3, a second pipe 4, a condensate pump 5, a third pipe 6, a heater 7, a fourth pipe 8, and a fifth pipe 9. One end of the first pipe 2 is connected to the exhaust steam outlet of the turbine (condenser) 1, and the other end of the first pipe 2 is connected to the exhaust steam inlet of the condenser 3. The low-temperature condensate outlet of the condenser 3 is connected to the low-temperature condensate inlet of the heater 7 via the second pipe 4. A condensate pump (i.e., water pump) 5 is installed on the second pipe 4. The third pipe... One end of pipe 6 is connected to the low-pressure steam outlet of turbine (condensing turbine) 1, and the other end of pipe 6 is connected to the low-pressure steam inlet of heater 7; the steam condensate outlet of heater 7 is connected to the fifth pipe 9, and the low-temperature condensate (heated by low-pressure steam) of heater 7 is connected to the fourth pipe 8 (the fourth pipe 8 is connected to the deaerator); it also includes a condensing turbine exhaust self-pressurization waste heat recovery device 12, which includes a pressurization and heating unit 13 and a phase change heating unit 14. The mixed steam output port of the heating unit 13 is connected to the mixed steam input port of the phase change heating unit 14; the exhaust steam inlet of the pressure boosting and heating unit 13 is connected to the first pipe 2 via the sixth pipe 10 through a tee pipe (that is, the exhaust steam inlet of the pressure boosting and heating unit 13 is connected to the exhaust steam outlet of the turbine via the sixth pipe 10, so that part of the exhaust steam from the turbine can be recycled for waste heat recovery); the power steam inlet of the pressure boosting and heating unit 13 is connected to the low-pressure steam outlet of the turbine 1 via the seventh pipe 11; the mixed steam condensate of the phase change heating unit 14... The outlet is connected to the condensate collection tank inlet of the condenser 3 (i.e., the condensate enters the condensate tank 27) via the eighth pipe 15. The low-temperature condensate inlet of the phase change heating unit 14 is connected to the second pipe 4 via the tenth pipe 17 through a tee pipe (the tee pipe is located on the output side of the condensate pump 5). The low-temperature condensate outlet of the phase change heating unit 14 (after being heated by the mixed steam) is connected to one end of the ninth pipe 16. The other end of the ninth pipe 16 is connected to the second pipe 4 via a tee pipe (the tee pipe is located on the output side of the condensate pump 5).

[0013] The pressurization and heating unit 13 includes a pressurization and heating unit housing 20, a Laval nozzle 21, and a Venturi tube 22. The pressurization and heating unit housing 20 is hollow, and a power steam inlet is provided at the left end of the pressurization and heating unit housing 20 (connected to the low-pressure steam outlet of the steam turbine 1 via the seventh pipe 11; for ease of description, Figure 1(Left side is left, right side is right). The right end of the pressurization and heating unit housing 20 is provided with a mixed steam outlet, and the bottom left end of the pressurization and heating unit housing 20 is provided with a waste steam inlet (connected to the sixth pipe 10). The Laval nozzle 21 and the Venturi tube 22 are both located in the cavity of the pressurization and heating unit housing 20. The Laval nozzle 21 and the Venturi tube 22 are both fixed on the pressurization and heating unit housing 20. The Laval nozzle 21 is located to the left of the Venturi tube 22. The inlet of the Laval nozzle 21 is connected to the power steam inlet at the left end of the pressurization and heating unit housing 20. The outlet of the Laval nozzle 21 is located at the inlet of the Venturi tube 22. The outlet of the Venturi tube 22 is connected to the mixed steam outlet at the right end of the pressurization and heating unit housing 20. The phase change heating unit 14 includes a phase change heating unit shell 24, a phase change heat pipe 26, a low-temperature condensate inlet lower half-end head 28, a low-temperature condensate outlet upper half-end head 30, and a partition 29 between the upper and lower half-end heads. The phase change heating unit shell 24 is hollow, and the central region inside the phase change heating unit shell 24 is a steam phase change zone 25. The phase change heat pipe 26 is installed in the steam phase change zone 25. The phase change heat pipe 26 is a U-shaped heat exchange tube bundle. The inlet end of the phase change heat pipe 26 is connected to the low-temperature condensate inlet port of the low-temperature condensate inlet lower half-end head 28 at the right end of the phase change heating unit shell 24, and the outlet end of the phase change heat pipe 26 is connected to the low-temperature condensate outlet at the right end of the phase change heating unit shell 24. The low-temperature condensate outlet of the upper half-head 30 is connected. The left end of the phase change heating unit shell 24 is provided with a mixed steam inlet. The mixed steam inlet is connected to the mixed steam outlet of the pressure boosting and heating unit 13 via the eleventh pipe 23. The lower half-head 28 of the phase change heating unit shell 24 is provided with a low-temperature condensate inlet (connected to the tenth pipe 17). The upper half-head 30 of the phase change heating unit shell 24 is provided with a low-temperature condensate outlet (connected to the ninth pipe 16). The bottom middle part of the phase change heating unit shell 24 is provided with a condensate tank 27. The condensate tank 27 is provided with a mixed steam condensate outlet (connected to the eighth pipe 15).

[0014] Example 2 (Integral): like Figure 1 , Figure 3As shown, the turbine exhaust self-pressurization waste heat recovery system is basically the same as that in Embodiment 1, except that the pressurization and heating unit 13 and the phase change heating unit 14 of the condensing turbine exhaust self-pressurization waste heat recovery device 12 are integrated structures (sharing a single housing); the condensing turbine exhaust self-pressurization waste heat recovery device includes the pressurization and heating unit 13 and the phase change heating unit 14; the pressurization and heating unit 13 and the phase change heating unit 14 share a single integrated housing 31, which is a cavity. A support partition 32 is fixed in the middle of the cavity of the integrated housing 31. The left side of the support partition 32 is the pressurization and heating unit 13, and the right side of the support partition 32 is the phase change heating unit 14; the support partition 32 is provided with a through hole through which the output end of the Venturi tube passes. The pressurization and heating unit 13 includes a Laval nozzle 21 and a Venturi tube 22. The left end of the integral housing 31 is provided with a power steam inlet (connected to the low-pressure steam outlet of the turbine 1 via the seventh pipe 11), and the bottom left end of the integral housing 31 is provided with an exhaust steam inlet (connected to the sixth pipe 10). Both the Laval nozzle 21 and the Venturi tube 22 are located within the cavity on the left side of the integral housing 31 (i.e., the cavity on the left side of the supporting partition 32), and are fixed to the integral housing. On 31, the Laval nozzle 21 is located to the left of the Venturi tube 22. The inlet of the Laval nozzle 21 is connected to the power steam inlet at the left end of the integral housing 31. The outlet of the Laval nozzle 21 is located at the inlet of the Venturi tube 22. The output end of the Venturi tube 22 passes through the through hole on the support partition 32 (the outlet of the Venturi tube 22 is located in the mixed steam inlet of the phase change heating unit 14). The outlet (mixed steam outlet) of the Venturi tube 22 is connected to the phase change heating unit 14. The phase change heating unit 14 includes a phase change heat pipe 26, a low-temperature condensate inlet lower half-end head 28, a low-temperature condensate outlet upper half-end head 30, and a partition 29 between the upper and lower half-end heads. The central area on the right side of the integral shell 31 is a steam phase change zone 25, in which the phase change heat pipe 26 is installed. The phase change heat pipe 26 is a U-shaped heat exchange tube bundle. The inlet end of the phase change heat pipe 26 is connected to the low-temperature condensate inlet of the low-temperature condensate inlet lower half-end head 28 at the right end of the integral shell 31, and the outlet end of the phase change heat pipe 26 is connected to the integral shell 31. The low-temperature condensate outlet of the upper half-end head 30 at the right end of the shell 31 is connected to the low-temperature condensate outlet. The low-temperature condensate inlet of the lower half-end head 28 at the right end of the integral shell 31 is provided with a low-temperature condensate inlet (connected to the tenth pipe 17). The low-temperature condensate outlet of the upper half-end head 30 at the right end of the integral shell 31 is provided with a low-temperature condensate outlet (connected to the ninth pipe 16). The middle bottom end of the right part of the integral shell 31 is provided with a condensate tank 27, and a mixed steam condensate outlet (connected to the eighth pipe 15) is provided at the condensate tank 27.

[0015] Process flow description: Currently, the exhaust steam from a pure condensing turbine is entirely discharged into the condenser, where it is then cooled by circulating cooling water, transferring all of its latent heat of vaporization to the atmosphere.

[0016] This invention involves extracting a portion of the turbine exhaust steam from the inlet pipe leading to the condenser and connecting it to a condenser exhaust steam self-pressurization waste heat recovery device. First, this portion of the turbine exhaust steam enters the ejector end (i.e., the "exhaust steam inlet") of the pressurization and heating unit of the condenser exhaust steam self-pressurization waste heat recovery device. Then, low-pressure heating steam from the turbine's low-pressure cylinder is introduced at the power steam working end. This power steam draws in and directly mixes with a portion of the exhaust steam discharged from the condenser, pressurizing and heating the exhaust steam. The resulting mixed steam has a higher pressure and temperature than the exhaust steam discharged from the turbine. Next, the mixed steam enters the phase change heating unit, heating the condensate from the condensate pump outlet. After releasing its latent heat of vaporization, the mixed steam condenses into water. Under the influence of gravity due to the height difference, the steam condensate returns to the water collection tank at the lower end of the condenser, mixes with the condensate in the condenser, and is pumped out together as boiler makeup water for reuse.

[0017] The condensate heated by the phase change heating unit can be further heated by the original low-temperature heater and then sent to the deaerator.

[0018] The self-pressurizing waste heat recovery device for condensing turbine exhaust steam successfully solves the problem that turbine exhaust steam cannot directly heat condensate, achieving the goal of heating condensate with the latent heat of turbine exhaust steam to save high-grade steam. Simultaneously, it recovers exhaust steam condensate, reducing circulating cooling water consumption and lowering carbon emissions, demonstrating significant economic and environmental value.

[0019] Table 1, Performance Parameter Table (Taking 1.0t / h exhaust steam recovery as an example) Note: In Table 1, the enthalpy of the turbine exhaust steam is 2576.24 kJ / kg, and the enthalpy of the turbine extraction steam is 2778.72 kJ / kg. Both enthalpy values ​​and latent heat of vaporization are very close. Recovering the heating capacity of 1.0 t / h of turbine exhaust steam translates to saving approximately 0.9 t / h of high-quality steam extracted from the turbine. Therefore, the essence of turbine exhaust steam recovery is to save the high-quality steam from the turbine for low-temperature heating.

Claims

1. A steam turbine exhaust self-pressurization waste heat recovery and utilization system, comprising a first pipe (2), a condenser (3), a second pipe (4), a condensate pump (5), a third pipe (6), a heater (7), a fourth pipe (8), and a fifth pipe (9); one end of the first pipe (2) is connected to the exhaust steam outlet of the steam turbine (1), and the other end of the first pipe (2) is connected to the exhaust steam inlet of the condenser (3); the low-temperature condensate outlet of the condenser (3) is connected to the low-temperature condensate inlet of the heater (7) via the second pipe (4); a condensate pump (5) is provided on the second pipe (4); one end of the third pipe (6) is connected to the low-pressure steam outlet of the steam turbine (1), and the other end of the third pipe (6) is connected to the low-pressure steam inlet of the heater (7); the steam condensate outlet of the heater (7) is connected to the fifth pipe (9), and the low-temperature condensate of the heater (7) is connected to the fourth pipe (8); characterized in that It also includes a condensing turbine exhaust steam self-pressurization waste heat recovery device (12), which includes a pressurization and heating unit (13) and a phase change heating unit (14). The mixed steam output port of the pressurization and heating unit (13) is connected to the mixed steam input port of the phase change heating unit (14). The exhaust steam inlet of the pressurization and heating unit (13) is connected to the first pipe (2) through the sixth pipe (10) via a three-way pipe. The power steam inlet of the pressurization and heating unit (13) is connected to the first pipe (2) through the seventh pipe (11). The low-pressure steam outlet of the steam turbine (1) is connected to the steam outlet of the phase change heating unit (14); the mixed steam condensate outlet of the phase change heating unit (14) is connected to the condensate collection tank inlet of the condenser (3) via the eighth pipe (15); the low-temperature condensate inlet of the phase change heating unit (14) is connected to the second pipe (4) via the tenth pipe (17) through a three-way pipe; the low-temperature condensate outlet of the phase change heating unit (14) is connected to one end of the ninth pipe (16); and the other end of the ninth pipe (16) is connected to the second pipe (4) via a three-way pipe.

2. The steam turbine exhaust self-pressurizing waste heat recovery system according to claim 1, characterized in that, The pressurization and heating unit (13) includes a pressurization and heating unit housing (20), a Laval nozzle (21), and a Venturi tube (22). The pressurization and heating unit housing (20) is a cavity. The left end of the pressurization and heating unit housing (20) is provided with a power steam inlet, the right end of the pressurization and heating unit housing (20) is provided with a mixed steam outlet, and the bottom left end of the pressurization and heating unit housing (20) is provided with a waste steam inlet. The Laval nozzle (21) and the Venturi tube (22) are both located in the pressurization and heating unit housing (20). Inside the cavity of the pressure boosting and heating unit housing (20), the Laval nozzle (21) and the Venturi tube (22) are fixed on the housing (20). The Laval nozzle (21) is located on the left side of the Venturi tube (22). The inlet of the Laval nozzle (21) is connected to the power steam inlet at the left end of the pressure boosting and heating unit housing (20). The outlet of the Laval nozzle (21) is located at the inlet of the Venturi tube (22). The outlet of the Venturi tube (22) is connected to the mixed steam outlet at the right end of the pressure boosting and heating unit housing (20). The phase change heating unit (14) includes a phase change heating unit shell (24), a phase change heat pipe (26), a low-temperature condensate inlet lower half-end head (28), a low-temperature condensate outlet upper half-end head (30), and a partition (29) between the upper and lower half-end heads. The phase change heating unit shell (24) is a cavity, and the central area inside the phase change heating unit shell (24) is a steam phase change zone (25). The steam phase change zone (25) is equipped with a phase change heat pipe (26), which is a U-shaped heat exchange tube bundle. The inlet end of the phase change heat pipe (26) is connected to the low-temperature condensate inlet of the low-temperature condensate inlet lower half-end head (28) at the right end of the phase change heating unit shell (24), and the outlet end of the phase change heat pipe (26) is connected to the low-temperature condensate inlet of the low-temperature condensate inlet lower half-end head (28) at the right end of the phase change heating unit shell (24). The low-temperature condensate outlet of the upper half-end head (30) of the low-temperature condensate outlet at the right end of the phase change heating unit housing (24) is connected to the low-temperature condensate outlet. The left end of the phase change heating unit housing (24) is provided with a mixed steam inlet. The mixed steam inlet is connected to the mixed steam outlet of the pressure boosting and heating unit (13) via the eleventh pipe (23). The lower half-end head (28) of the low-temperature condensate inlet at the right end of the phase change heating unit housing (24) is provided with a low-temperature condensate inlet. The upper half-end head (30) of the low-temperature condensate outlet at the right end of the phase change heating unit housing (24) is provided with a low-temperature condensate outlet. The bottom middle part of the phase change heating unit housing (24) is provided with a condensate tank (27). The condensate tank (27) is provided with a mixed steam condensate outlet.

3. The steam turbine exhaust self-plenum waste heat recovery system of claim 1, wherein, The pressure boosting and heating unit (13) and the phase change heating unit (14) of the condensing turbine exhaust self-pressurization waste heat recovery device (12) are integrated structures; the pressure boosting and heating unit (13) and the phase change heating unit (14) share an integral shell (31), the integral shell (31) is a cavity, and a support partition (32) is fixed in the middle of the cavity of the integral shell (31). The left side of the support partition (32) is the pressure boosting and heating unit (13), and the right side of the support partition (32) is the phase change heating unit (14); the support partition (32) is provided with a through hole through which the output end of the Venturi tube passes. The pressurization and heating unit (13) includes a Laval nozzle (21) and a Venturi tube (22). The left end of the integral shell (31) is provided with a power steam inlet, and the bottom left end of the integral shell (31) is provided with a waste steam inlet. The Laval nozzle (21) and the Venturi tube (22) are both located in the cavity on the left side of the integral shell (31). The Laval nozzle (21) and the Venturi tube (22) are both fixed on the integral shell (31). The Laval nozzle (21) is located on the left side of the Venturi tube (22). The inlet of the Laval nozzle (21) is connected to the power steam inlet at the left end of the integral shell (31). The outlet of the Laval nozzle (21) is located at the inlet of the Venturi tube (22). The output end of the Venturi tube (22) passes through the through hole on the support partition (32). The mixed steam output port of the Venturi tube (22) is connected to the phase change heating unit (14). The phase change heating unit (14) includes a phase change heat pipe (26), a lower half-end head (28) for low-temperature condensate inlet, an upper half-end head (30) for low-temperature condensate outlet, and a partition (29) between the upper and lower half-end heads. The middle area on the right side of the integral shell (31) is a steam phase change zone (25). The phase change heat pipe (26) is installed in the steam phase change zone (25). The phase change heat pipe (26) is a U-shaped heat exchange tube bundle. The inlet end of the phase change heat pipe (26) is connected to the low-temperature condensate inlet lower half-end head (28) at the right end of the integral shell (31) for low-temperature condensate supply. The inlet is connected to the outlet end of the phase change heat pipe (26) and the low temperature condensate outlet of the upper half head (30) of the low temperature condensate outlet at the right end of the integral shell (31). The low temperature condensate inlet is provided on the lower half head (28) of the low temperature condensate inlet at the right end of the integral shell (31). The low temperature condensate outlet is provided on the upper half head (30) of the low temperature condensate outlet at the right end of the integral shell (31). The middle bottom end of the right part of the integral shell (31) is provided with a condensate tank (27). The condensate tank (27) is provided with a mixed steam condensate outlet.

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