Indirect air cooling unit heat recovery system

Abstract

This utility model provides a heat recovery system for an indirect air-cooled unit. The system includes: a steam turbine; a primary condenser located below the steam turbine and connected to it; a waste steam extraction unit connected to one end of the primary condenser and connected to a waste steam condensation heat exchange unit at the other end; a three-stage desuperheating and pressure reducing unit connected to the waste steam extraction unit; a low-pressure bypass unit connected at one end to the waste steam extraction unit and at the other end to the primary condenser; and a booster turbine related unit, a heating network circulating water unit, and a vacuum unit, all connected to the waste steam condensation heat exchange unit. The technical solution of this utility model utilizes a condenser located below the steam turbine unit to extract waste steam from the condenser, achieving full utilization of the waste steam in the indirect air-cooled unit while ensuring the stress and safety of the condenser, reducing the cost of waste steam recovery, and achieving economical operation.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to an indirect air-cooled unit heat recovery system. Background Technology

[0002] Air-cooled units can be divided into direct air-cooled and indirect air-cooled units. In direct air-cooled turbines, the exhaust steam is directly condensed by air, with direct heat exchange between steam and air, and no circulating water system. Indirect air-cooled systems use water as the intermediate cooling medium and have a circulating water system. Indirect air-cooled units have low back pressure, are less affected by the environment, have a high operational safety factor, and low plant power consumption. Therefore, most newly built air-cooled units in recent years have adopted indirect air-cooling. Indirect air-cooled units use condensers for cooling, but this results in cold source losses, which constitute a major energy loss for power plants, accounting for approximately 50% of the total energy loss. With the continuous advancement of urbanization, it is known that there is a shortage of heat sources for centralized clean heating in urban areas. Therefore, research on condenser exhaust steam utilization to improve the economic efficiency of power plants and realize urban heating has become a hot research topic in recent years. Utility Model Content

[0003] This invention provides a heat recovery system for indirect air-cooled units, which solves the problems of difficulty in recovering the exhaust steam heat from the condenser and the large engineering investment and high operating costs required for recovery.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: This utility model provides an indirect air-cooled unit heat recovery system, including: Steam turbine; The original condenser is arranged below the steam turbine and is connected to the steam turbine. The exhaust steam extraction unit is connected to one end of the original condenser, and the other end of the exhaust steam extraction unit is connected to the exhaust steam condensation heat exchange unit. A three-stage desuperheating and pressure reducing unit is connected to the exhaust steam extraction unit; A low-pressure bypass unit with one end connected to the exhaust steam extraction unit and the other end connected to the original condenser; The steam turbine related units, the heating network circulating water unit, and the vacuum pumping unit are respectively connected to the exhaust steam condensation heat exchange unit.

[0005] Optionally, the exhaust steam extraction unit includes: A square box for the exhaust steam pipeline directly connected to the outlet of the original condenser; The waste steam pipeline is connected to the outlet of the waste steam pipeline box.

[0006] Optionally, the three-stage desuperheating and pressure reducing unit is a three-stage desuperheating and pressure reducing device, and the inlet of the three-stage desuperheating and pressure reducing device is connected to the exhaust steam pipeline.

[0007] Optionally, the low-pressure bypass unit is a low-pressure bypass steam pipe, one end of which is connected to the exhaust steam pipe and the other end is connected to the original condenser.

[0008] Optionally, the exhaust steam condensation heat exchange unit includes: The pre-condenser and the steam booster condenser are connected to the exhaust steam extraction unit; The heat exchange area of ​​the pre-condenser and the steam-enhancing condenser is the same.

[0009] Optionally, the steam turbine-related units include: A steam turbine connected to the steam-generating condenser; A steam pipe connecting the inlet of the booster turbine to the exhaust steam outlet unit; The steam source for the gas generator is connected to the gas generator.

[0010] Optionally, the heating network circulating water unit includes: A heating network circulating water pipe that runs through the entire heating network circulating water unit; A heat network filter installed at the inlet of the heat network circulating water pipeline; A heating network heater installed at the outlet of the heating network circulating water pipeline; A bypass for the heating network circulating water of the steam-injecting condenser, with both ends connected to the heating network circulating water pipelines at the inlet and outlet of the steam-injecting condenser, respectively. A pre-condenser heat network circulating water bypass whose two ends are respectively connected to the heat network circulating water pipelines at the inlet and outlet of the pre-condenser. The main flow path of the heating network circulating water is formed by connecting the heating network circulating water pipeline, the heating network water filter, the pre-condenser, the steam-enhancing condenser, and the heating network heater in series. The backup flow path of the heating network circulating water is formed by connecting the heating network circulating water pipeline, the heating network water filter, the pre-condenser heating network circulating water bypass, the steam-enhancing condenser heating network circulating water bypass, and the heating network heater in series.

[0011] Optionally, the vacuum pumping unit includes: Two water ring vacuum pumps are connected to the pre-condenser and the steam-enhancing condenser respectively. A vacuum extraction pipe is installed between the two water ring vacuum pumps; A vacuum system isolation valve installed on the vacuum pipeline.

[0012] Optionally, the system further includes: Exhaust steam condensate pipeline; Condensate piping for pre-condenser heating network; The condensate outlet of the booster condenser is connected to the condensate inlet of the pre-condenser via the exhaust steam condensate pipe, and the condensate outlet of the pre-condenser is connected to the condensate inlet of the original condenser via the exhaust steam condensate pipe, forming a staged gravity flow loop for the heating network condensate; one end of the pre-condenser heating network condensate pipe is connected to the condensate outlet of the booster condenser, and the other end is connected to the condensate inlet of the original condenser.

[0013] The above-described solution of this utility model has at least the following beneficial effects: The indirect air-cooled unit heat recovery system of this utility model includes: a steam turbine; a primary condenser arranged below the steam turbine, the primary condenser being interconnected with the steam turbine; a waste steam extraction unit connected to one end of the primary condenser, the other end of the waste steam extraction unit being connected to a waste steam condensation heat exchange unit; a three-stage desuperheating and pressure reducing unit connected to the waste steam extraction unit; a low-pressure bypass unit connected at one end to the waste steam extraction unit and at the other end to the primary condenser; and related units for the booster turbine, a heating network circulating water unit, and a vacuum pumping unit, all connected to the waste steam condensation heat exchange unit. The technical solution of this utility model utilizes a condenser arranged directly below the steam turbine unit to extract waste steam from the condenser, achieving full utilization of the waste steam in the indirect air-cooled unit while ensuring the stress and safety of the condenser, reducing the cost of waste steam recovery, and achieving economical operation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the indirect air-cooled unit heat recovery system of this utility model.

[0015] The components include: 1. Steam turbine; 2. Original condenser; 3. Exhaust steam pipeline box; 4. Three-stage desuperheater and pressure reducer; 5. Low-pressure bypass steam pipeline; 6. Exhaust steam pipeline; 7. Exhaust steam pipeline to the booster turbine; 8. Pre-condenser; 9. Booster condenser; 10. Booster turbine power source; 11. Exhaust steam condensate pipeline; 12. Vacuum pipeline; 13. Heater network heater; 14. Heater network water filter; 15. Heater network circulating water pipeline; 16. Water ring vacuum pump; 17. Booster turbine; 18. Booster condenser heater network circulating water bypass; 19. Pre-condenser heater network circulating water bypass; 20. Pre-condenser heater network condensate pipeline; 21. Vacuum system isolation valve. Detailed Implementation

[0016] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0017] like Figure 1 As shown, an embodiment of this utility model proposes an indirect air-cooled unit heat recovery system, comprising: Steam turbine 1; The original condenser 2 is arranged below the steam turbine 1 and is connected to the steam turbine 1. The exhaust steam extraction unit is connected to one end of the original condenser 2, and the other end of the exhaust steam extraction unit is connected to the exhaust steam condensation heat exchange unit. A three-stage desuperheating and pressure reducing unit is connected to the exhaust steam extraction unit; A low-pressure bypass unit with one end connected to the exhaust steam extraction unit and the other end connected to the original condenser 2; The steam turbine related units, the heating network circulating water unit, and the vacuum pumping unit are respectively connected to the exhaust steam condensation heat exchange unit.

[0018] In this embodiment, the steam turbine 1 is the power equipment of the heat recovery system. During power generation, the steam turbine 1 converts the thermal energy of steam into mechanical energy, thereby driving the generator to generate electricity. The primary condenser 2 is connected to the steam turbine 1, allowing the exhaust steam discharged from the steam turbine 1 to smoothly enter the primary condenser 2 for cooling, thus cooling the exhaust steam discharged from the steam turbine 1 into condensate, achieving steam... A water phase change process maintains the vacuum state in the exhaust chamber of turbine 1, ensuring its normal operation. The exhaust steam extraction unit is connected to one end of the original condenser 2 and extracts a portion of the exhaust steam. The other end of the exhaust steam extraction unit is connected to the exhaust steam condensation heat exchange unit, where the extracted exhaust steam is transported. In the exhaust steam condensation heat exchange unit, the exhaust steam exchanges heat with the cooling medium to achieve heat recovery. The three-stage desuperheating and pressure reduction unit is used to adjust the exhaust steam parameters. The low-pressure bypass unit ensures the stability and safety of the unit under different operating conditions while avoiding excessive impact on the heat recovery system. Additionally... The steam turbine-related units are connected to the exhaust steam condensation heat exchange unit, which can further process the steam after heat exchange. The heating network circulating water unit can transfer the heat recovered in the exhaust steam condensation heat exchange unit to the heating network circulating water, which then transports the heat to the urban heating network or other places that require heat energy, realizing the effective utilization of heat and meeting heating demand. The vacuum unit is connected to the exhaust steam condensation heat exchange unit to maintain the vacuum state inside the exhaust steam condensation heat exchange unit. The vacuum environment helps to improve heat exchange efficiency, promotes the condensation of exhaust steam, and at the same time prevents non-condensable gases such as air from entering the system and affecting the normal operation of the system.

[0019] The heat recovery system of indirect air-cooled units achieves effective recovery and utilization of heat in indirect air-cooled units through the rational configuration of each unit, reduces the cold source loss of power plants, and thus realizes the full recovery and utilization of exhaust steam of indirect air-cooled units at low cost, thereby improving energy utilization efficiency.

[0020] like Figure 1 As shown, in an optional embodiment of the present invention, the exhaust steam extraction unit includes: The exhaust steam pipe box 3 is directly connected to the outlet of the original condenser 2; The exhaust steam pipe 6 is connected to the outlet of the exhaust steam pipe box 3.

[0021] In this embodiment, the waste steam pipe box 3 is directly connected to the outlet of the original condenser 2, and adopts a closed, gradually expanding structure to reduce the flow resistance when the waste steam enters the waste steam pipe box 3, thereby achieving a smooth exit of the waste steam. The outlet of the waste steam pipe box 3 is connected to the waste steam condensation heat exchange unit through the waste steam pipe 6. The exited waste steam enters the waste steam pipe 6 and is then transported to the waste steam condensation heat exchange unit via the waste steam pipe 6.

[0022] like Figure 1 As shown, in an optional embodiment of the present invention, the three-stage desuperheating and pressure reducing unit is a three-stage desuperheating and pressure reducing device 4, the inlet of the three-stage desuperheating and pressure reducing device 4 is connected to the exhaust steam pipeline 6, the low-pressure bypass unit is a low-pressure bypass steam pipeline 5, one end of the low-pressure bypass steam pipeline 5 is connected to the exhaust steam pipeline 6, and the other end is connected to the original condenser 2.

[0023] In this embodiment, the low-pressure bypass steam pipeline 5 is used as an emergency channel to bypass the conventional heat recovery process and return part or all of the exhaust steam directly to the original condenser 2 under certain operating conditions, such as unit startup, low-load operation, or failure, thereby ensuring system safety and stability.

[0024] like Figure 1 As shown, in an optional embodiment of this utility model, the exhaust steam condensation heat exchange unit includes: The pre-condenser 8 and the steam booster condenser 9 are connected to the exhaust steam extraction unit; The heat exchange area of ​​the pre-condenser 8 and the steam-enhancing condenser 9 is the same.

[0025] In this embodiment, the exhaust steam condensation heat exchange unit is used to condense and exchange heat from the exhaust steam drawn from the turbine and after certain treatment, transferring the heat in the exhaust steam to other media (such as the circulating water of the heating network) to achieve heat recovery and utilization. Simultaneously, the exhaust steam is condensed into water for subsequent recycling or treatment. The exhaust steam is first transported to the pre-condenser 8 for preliminary condensation treatment, allowing the exhaust steam to exchange heat with the cooling medium (such as the circulating water of the heating network). Part of the exhaust steam is condensed into water, and heat is transferred to the cooling medium, improving the overall efficiency of the exhaust steam condensation heat exchange unit. The steam booster condenser 9 is also used to process the steam after it has been processed by the steam booster 17, further expanding the scope of heat recovery and improving energy utilization efficiency. The circulating water temperature after passing through the pre-condenser 8 and the steam booster condenser 9 can reach approximately 30°C. The preheating temperature is around 50°C; the heat exchange area of ​​the pre-condenser 8 and the steam booster condenser 9 is the same, so that the exhaust steam flow can be evenly distributed during joint operation.

[0026] like Figure 1 As shown, in an optional embodiment of this utility model, the steam turbine related unit includes: A steam turbine 17 is connected to the steam-generating condenser 9; The exhaust steam pipe 7 of the turbine 17 connects the inlet of the turbine 17 to the exhaust steam outlet unit. The steam source 10 for the steam generator is connected to the steam generator 17.

[0027] In this embodiment, the outlet of the booster turbine 17 is directly connected to the booster condenser 9, forming a closed-loop path for waste steam transport. The booster turbine 17 uses low-pressure steam to perform work, increasing the steam pressure and temperature. The waste steam pipeline 7 to the booster turbine connects the waste steam pipeline 6 to the inlet of the booster turbine 17, diverting a portion of the waste steam from the waste steam pipeline 6 into the booster turbine 17. The booster turbine power source 10 provides driving force to the booster turbine 17. The booster turbine power source 10 draws the waste steam into the booster turbine 17 and then discharges it into the booster condenser 9. Specifically, the booster turbine power source 10 provides driving energy to make the booster turbine 17 run. The booster turbine 17 draws waste steam from the waste steam extraction unit through the waste steam pipeline 7 to the booster turbine. The waste steam mixes with the booster turbine power source 10 in the booster turbine 17, is pressurized, and then enters the booster condenser 9 for condensation.

[0028] like Figure 1 As shown, in an optional embodiment of the present invention, the heating network circulating water unit includes: A heating network circulating water pipe 15 runs through the entire heating network circulating water unit; A heat network filter 14 is installed at the inlet of the heat network circulating water pipe 15; A heating network heater 13 is installed at the outlet of the heating network circulating water pipe 15; A bypass 18 for the heating network circulating water of the steam-increasing condenser 9, which is connected at both ends to the heating network circulating water pipeline 15 at the inlet and outlet of the steam-increasing condenser 9. A pre-condenser heat network circulating water bypass 19, whose two ends are respectively connected to the heat network circulating water pipeline 15 at the inlet and outlet of the pre-condenser 8. The main flow path of the heating network circulating water is formed by connecting the heating network circulating water pipeline 15, the heating network water filter 14, the pre-condenser 8, the steam-enhancing condenser 9, and the heating network heater 13 in series. The backup flow path of the heating network circulating water is formed by connecting the heating network circulating water pipeline 15, the heating network water filter 14, the pre-condenser heating network circulating water bypass 19, the steam-enhancing condenser heating network circulating water bypass 18, and the heating network heater 13 in series.

[0029] In this embodiment, the heating network circulating water pipeline 15 is used to transport heating network circulating water; the heating network water filter 14 is used to filter solid impurities in the heating network circulating water; and the heating network heater 13 is used to raise the temperature of the heating network circulating water after preheating by the pre-condenser 8 and the steam booster condenser 9 to the required temperature.

[0030] The heating network circulating water unit mainly provides two paths for the transmission of heating network circulating water. The first is the main flow path, which sequentially flows through the heating network circulating water pipe 15, the heating network water filter 14, the pre-condenser 8, the steam-enhancing condenser 9, and the heating network heater 13. The second is the backup flow path, which sequentially flows through the heating network circulating water pipe 15, the heating network water filter 14, the pre-condenser heating network circulating water bypass 19, the steam-enhancing condenser heating network circulating water bypass 18, and the heating network heater 13. The backup flow path is mainly used in case of an accident involving the pre-condenser 8 or the steam-enhancing condenser 9; in this case, the heating network circulating water can be supplied to the heating network through the steam-enhancing condenser heating network circulating water bypass 18 and the pre-condenser heating network circulating water bypass 19.

[0031] like Figure 1 As shown, in an optional embodiment of the present invention, the vacuum pumping unit includes: Two water ring vacuum pumps 16 are respectively connected to the pre-condenser 8 and the steam-enhancing condenser 9. A vacuum pipe 12 is installed between the two water ring vacuum pumps 16; Vacuum system isolation valve 21 installed on the vacuum pipe 12.

[0032] In this embodiment, two water ring vacuum pumps 16 are connected to the pre-condenser 8 and the steam-enhancing condenser 9 in a one-to-one correspondence, ensuring that the two condensers have independent vacuum channels. The vacuum process can be flexibly controlled according to the actual operating conditions of the condensers. By extracting non-condensable gases through the water ring vacuum pumps 16, the vacuum level inside the condensers can be maintained, ensuring the normal operation of the condensers. Under normal operating conditions, the two water ring vacuum pumps 16 operate independently, controlling the vacuum levels of the pre-condenser 8 and the steam-enhancing condenser 9 respectively. When one water ring vacuum pump 16 fails, the vacuum system isolation valve 21 is opened to maintain the vacuum levels of the pre-condenser 8 and the steam-enhancing condenser 9.

[0033] The vacuum pipe 12 provides a path for gas flow between the two water ring vacuum pumps 16, and also facilitates centralized management and control of the entire vacuum system. It allows for parallel operation of the two water ring vacuum pumps 16. When independent control is required, the gas flow in the vacuum pipe 12 can be cut off using the vacuum system isolation valve 21. During normal operation, the two water ring vacuum pumps 16 can work simultaneously, sharing the vacuum task and improving pumping efficiency. When one water ring vacuum pump 16 malfunctions or requires maintenance, the other water ring vacuum pump 16 can continue to maintain the system's vacuum level through the vacuum pipe 12, ensuring continuous system operation.

[0034] like Figure 1 As shown, in an optional embodiment of the present invention, the indirect air-cooled unit heat recovery system further includes: Exhaust steam condensate pipeline 11; 20 mm of condensate pipe in the pre-condenser heating network; The condensate outlet of the booster condenser 9 is connected to the condensate inlet of the pre-condenser 8 via the exhaust steam condensate pipe 11, and the condensate outlet of the pre-condenser 8 is connected to the condensate inlet of the original condenser 2 via the exhaust steam condensate pipe 11, forming a staged gravity flow loop for the heating network condensate; one end of the pre-condenser heating network condensate pipe 20 is connected to the condensate outlet of the booster condenser 9, and the other end is connected to the condensate inlet of the original condenser 2.

[0035] In this embodiment, the exhaust steam condensate pipeline 11 serves as a condensate transport channel, constructing a staged gravity flow loop for the heating network condensate. This allows the condensate to flow orderly between different devices, achieving effective heat transfer and utilization. The condensate outlet of the booster condenser 9 is connected to the condensate inlet of the pre-condenser 8 through the exhaust steam condensate pipeline 11. That is, the booster condenser 9 generates condensate during the condensation of steam. This condensate carries a certain amount of heat and is transported to the pre-condenser 8 through this pipeline. The condensate outlet of the pre-condenser 8 is also connected to the condensate inlet of the original condenser 2 through the exhaust steam condensate pipeline 11, forming a staged gravity flow loop for the heating network condensate, which improves the system's operating efficiency.

[0036] The pre-condenser heating network condensate pipe 20 provides another path for the flow of condensate. One end of it is connected to the condensate outlet of the booster condenser 9, and the other end is connected to the condensate inlet of the original condenser 2. It works in conjunction with the exhaust steam condensate pipe 11 to ensure that the condensate can smoothly return to the original condenser 2 under different operating conditions.

[0037] The above embodiments of this utility model construct an indirect air-cooled unit heat recovery system by using components such as a waste steam pipeline box, a three-stage desuperheater and pressure reducer, and a vacuum system isolation valve. It provides two modes for selection: pure high back pressure and combined operation of a steam turbine and high back pressure. This achieves complete recovery and utilization of waste steam, while reducing recovery costs, improving energy utilization efficiency, and reducing energy loss.

[0038] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A heat recovery system for an indirect air-cooled unit, characterized in that, include: Steam turbine (1); The original condenser (2) is arranged below the steam turbine (1) and is connected to the steam turbine (1); The exhaust steam extraction unit is connected to one end of the original condenser (2), and the other end of the exhaust steam extraction unit is connected to the exhaust steam condensation heat exchange unit; A three-stage desuperheating and pressure reducing unit is connected to the exhaust steam extraction unit; A low-pressure bypass unit with one end connected to the exhaust steam outlet unit and the other end connected to the original condenser (2); The steam turbine related units, the heating network circulating water unit, and the vacuum pumping unit are respectively connected to the exhaust steam condensation heat exchange unit.

2. The indirect air-cooled unit heat recovery system according to claim 1, characterized in that, The exhaust steam extraction unit includes: A square box (3) for exhaust steam pipes directly connected to the outlet of the original condenser (2); The exhaust steam pipe (6) is connected to the outlet of the exhaust steam pipe box (3).

3. The indirect air-cooled unit heat recovery system according to claim 2, characterized in that, The three-stage desuperheating and pressure reducing unit is a three-stage desuperheating and pressure reducing device (4), and the inlet of the three-stage desuperheating and pressure reducing device (4) is connected to the exhaust steam pipeline (6).

4. The indirect air-cooled unit heat recovery system according to claim 2, characterized in that, The low-pressure bypass unit is a low-pressure bypass steam pipe (5), one end of which is connected to the exhaust steam pipe (6), and the other end is connected to the original condenser (2).

5. The indirect air-cooled unit heat recovery system according to claim 1, characterized in that, The exhaust steam condensation heat exchange unit includes: The pre-condenser (8) and the steam booster condenser (9) are connected to the exhaust steam extraction unit. The heat exchange area of ​​the pre-condenser (8) and the steam-enhancing condenser (9) is the same.

6. The indirect air-cooled unit heat recovery system according to claim 5, characterized in that, The steam turbine-related units include: A steam turbine (17) connected to the steam condenser (9); A steam pipe (7) connecting the inlet of the steam generator (17) to the exhaust steam outlet unit to the steam generator exhaust pipe (7); The steam source (10) of the steam generator is connected to the steam generator (17).

7. The indirect air-cooled unit heat recovery system according to claim 5, characterized in that, The heating network circulating water unit includes: A heat network circulating water pipe (15) runs through the entire heat network circulating water unit. A heat network filter (14) is installed at the inlet of the heat network circulating water pipe (15). A heat network heater (13) is installed at the outlet of the heat network circulating water pipe (15). A bypass (18) for the heating network circulating water of the steam-increasing condenser, which is connected at both ends to the inlet and outlet of the steam-increasing condenser (9) and the heating network circulating water pipeline (15). A pre-condenser heat network circulating water bypass (19) whose two ends are respectively connected to the heat network circulating water pipeline (15) at the inlet and outlet of the pre-condenser (8); The main flow path of the heating network circulating water is formed by connecting the heating network circulating water pipeline (15), the heating network water filter (14), the pre-condenser (8), the steam-enhancing condenser (9), and the heating network heater (13) in sequence; the backup flow path of the heating network circulating water is formed by connecting the heating network circulating water pipeline (15), the heating network water filter (14), the pre-condenser heating network circulating water bypass (19), the steam-enhancing condenser heating network circulating water bypass (18), and the heating network heater (13) in sequence.

8. The indirect air-cooled unit heat recovery system according to claim 5, characterized in that, The vacuum pumping unit includes: Two water ring vacuum pumps (16) are connected one-to-one with the pre-condenser (8) and the steam-enhancing condenser (9), respectively. Vacuum pipe (12) is set between the two water ring vacuum pumps (16); Vacuum system isolation valve (21) installed on the vacuum pipe (12).

9. The indirect air-cooled unit heat recovery system according to claim 5, characterized in that, Also includes: Exhaust steam condensate pipeline (11); Condensate pipes for the pre-condenser heating network (20); The condensate outlet of the steam-enhancing condenser (9) is connected to the condensate inlet of the pre-condenser (8) through the exhaust steam condensate pipe (11), and the condensate outlet of the pre-condenser (8) is connected to the condensate inlet of the original condenser (2) through the exhaust steam condensate pipe (11), forming a step-by-step gravity flow loop for the heating network condensate; one end of the pre-condenser heating network condensate pipe (20) is connected to the condensate outlet of the steam-enhancing condenser (9), and the other end is connected to the condensate inlet of the original condenser (2).

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