A steam turbine waste heat recovery system

Abstract

The present application relates to the technical field of waste heat recovery, in particular to a steam turbine waste heat recovery system, which comprises a steam turbine and a body drain expansion vessel, and further comprises a heat user pipeline connected to one end of the steam turbine and to the other end of a heat user; a venting pipeline connected to one end of the heat user pipeline through a tee joint and venting to the other end; a steam exhaust device pipeline connected to one end of the venting pipeline through a tee joint and connected to a steam exhaust device at the other end; a circulating pump pipeline connected to one end of the steam exhaust device pipeline and connected to the steam exhaust device at the other end; and a drain expansion vessel pipeline connected to one end of the steam exhaust device and connected to the body drain expansion vessel at the other end. The steam exhaust device is used to cool and recover the excess steam in the heat user pipeline, thereby improving the energy utilization rate, reducing the waste of resources, and improving the steam utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery technology, and more specifically, to a steam turbine waste heat recovery system. Background Technology

[0002] When the gas consumption of heat users decreases sharply, the turbine's flow rate decreases, which cannot remove the heat generated by the friction of the blower. The exhaust temperature will increase accordingly, seriously endangering the safe operation of the turbine. At this time, the operator needs to open the turbine's exhaust valve to increase the turbine's flow rate, which will cause a large amount of working fluid and heat to be wasted.

[0003] Therefore, there is an urgent need for a steam turbine waste heat recovery system to solve the problem that existing steam turbines cannot effectively recover steam energy when the gas consumption decreases sharply. Summary of the Invention

[0004] In view of this, the present invention proposes a steam turbine waste heat recovery system, aiming to solve the problem that existing steam turbines cannot effectively recover steam energy, including a steam turbine and a main body hydrophobic expansion tank, and further including:

[0005] The heat user pipeline is connected to the steam turbine at one end and to the heat user at the other end.

[0006] An exhaust pipe is provided to the air, with one end connected to the heat user pipe via a tee and the other end venting to the air.

[0007] The exhaust pipe has one end connected to the air exhaust pipe via a tee, and the other end connected to the exhaust device.

[0008] The circulating pump pipeline is connected at one end to the exhaust device pipeline via a tee, and at the other end to the exhaust device.

[0009] The hydrophobic expansion container pipeline is connected at one end to the exhaust device and at the other end to the main hydrophobic expansion container.

[0010] Furthermore, it also includes:

[0011] A first control valve is installed at one end of the exhaust device pipeline near the air exhaust pipeline, and is used to connect the exhaust device pipeline according to the current steam temperature of the steam turbine.

[0012] The second control valve is installed in the exhaust pipe and is used to connect the exhaust pipe according to the current steam temperature of the turbine.

[0013] Furthermore, it also includes:

[0014] The steam control module is used to obtain the steam temperature of the steam turbine. When the steam temperature of the steam turbine is greater than T1, the first control valve is opened, and when the steam temperature of the steam turbine is greater than T2, the second control valve is opened.

[0015] The steam control module is also used to obtain the steam temperature rise rate of the steam turbine. When the steam temperature rise rate of the steam turbine is greater than the first preset rate threshold within a preset time, the first control valve is closed and the second control valve is opened directly. When the steam temperature rise rate of the steam turbine drops to the second preset rate threshold within a preset time, the first control valve is opened.

[0016] Furthermore, the exhaust device includes:

[0017] The spray water outlet is connected to the circulating pump pipeline and is used to send spray water to the circulating pump pipeline.

[0018] A spraying device, connected to the circulating pump pipeline, is used to spray spray water onto steam;

[0019] The first steam inlet is connected to the exhaust device pipeline;

[0020] The second steam inlet is connected to the circulating pump pipeline;

[0021] A steam-water separator is installed at the top of the exhaust device to separate the steam at the top of the exhaust device into steam and water.

[0022] Furthermore, the circulating pump pipeline includes:

[0023] The steam-driven circulating pump pipeline is connected to the exhaust device pipeline at one end via a tee, and the steam-driven circulating pump is connected at the other end.

[0024] A steam pipeline, one end of which is connected to the steam-driven circulating pump, and the other end of which is connected to the second steam inlet;

[0025] The spray water outlet pipeline is connected at one end to the spray water outlet and at the other end to the steam-driven circulation pump.

[0026] The spray water inlet pipe is connected to the pneumatic circulation pump at one end and to the spray device at the other end.

[0027] Furthermore, the circulating pump pipeline also includes:

[0028] An electric circulating pump is connected in parallel to the pneumatic circulating pump to assist the pneumatic circulating pump in starting.

[0029] Furthermore, the circulating pump pipeline also includes:

[0030] The deaerator pipeline is connected to the spray water inlet pipeline at one end via a tee, and the other end is connected to the deaerator. The deaerator is used to store the spray water discharged by the steam-driven circulating pump.

[0031] The demineralized water pipeline has demineralized water connected at one end and the spray water inlet pipeline at the other end. The demineralized water pipeline is used to discharge demineralized water to the exhaust device through the spray water inlet pipeline.

[0032] Furthermore, the circulating pump pipeline also includes:

[0033] The third control valve is located at the end of the spray water inlet pipe away from the demineralized water pipe, and is used to close the spray water inlet pipe according to the water temperature of the exhaust device.

[0034] The fourth control valve is installed in the deaerator pipeline and is used to connect the deaerator pipeline according to the water temperature of the exhaust steam device.

[0035] The fifth control valve is installed in the demineralized water pipeline and is used to connect the demineralized water pipeline according to the water temperature of the exhaust device.

[0036] Furthermore, the circulating pump pipeline also includes:

[0037] The spray water control module is used to obtain the water temperature of the exhaust device. When the water temperature of the exhaust device is greater than T3, the third control valve is closed and the fourth and fifth control valves are opened.

[0038] Furthermore, the hydrophobic expansion container pipeline is equipped with a gate valve.

[0039] Compared with the prior art, the beneficial effects of the present invention are that by connecting a steam exhaust device to the exhaust pipe and controlling the connection of the exhaust device to the pipe according to the corresponding temperature of the steam turbine through the control module, excess steam in the heat user's pipeline is cooled and recovered, which improves the energy utilization rate, reduces the waste of resources, and also improves the steam utilization efficiency. This avoids the problem of a large amount of working fluid and heat being wasted when the steam consumption of the heat user decreases sharply due to a reduction in the steam turbine's flow rate. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0041] Figure 1 This is a schematic diagram of a steam turbine waste heat recovery system provided in an embodiment of the present invention.

[0042] In the diagram: 100, Steam turbine; 200, Heat user pipeline; 201, Heat user; 300, Exhaust pipe to air; 301, Second control valve; 400, Exhaust device pipeline; 401, First control valve; 500, Exhaust device; 501, Spray water outlet; 502, Spray device; 503, First steam inlet; 504, Second steam inlet; 505, Steam-water separator; 511, Steam-driven circulating pump pipeline; 512, Steam-driven circulating pump. 513. Steam pipeline; 514. Spray water outlet pipeline; 515. Spray water inlet pipeline; 516. Electric circulating pump; 521. Deaerator pipeline; 522. Deaerator; 523. Fourth control valve; 524. Demineralized water pipeline; 525. Demineralized water; 526. Fifth control valve; 527. Third control valve; 528. Emergency drain pipeline; 600. Main body drain expansion container; 601. Drain expansion container pipeline; 602. Gate valve. Detailed Implementation

[0043] 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 to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] This invention proposes a steam turbine waste heat recovery system, such as... Figure 1 As shown, the system includes a steam turbine 100 and a main body condensate expansion tank 600, and further includes: a heat user pipeline 200, one end of which is connected to the steam turbine 100 and the other end of which is connected to a heat user 201; an air exhaust pipeline 300, one end of which is connected to the heat user pipeline 200 via a tee and the other end of which exhausts air; an exhaust device pipeline 400, one end of which is connected to the air exhaust pipeline 300 via a tee and the other end of which is connected to an exhaust device 500; a circulating pump pipeline, one end of which is connected to the exhaust device pipeline 400 via a tee and the other end of which is connected to the exhaust device 500; and a condensate expansion tank pipeline 601, one end of which is connected to the exhaust device 500 and the other end of which is connected to the main body condensate expansion tank 600.

[0045] In this embodiment, the main steam is delivered to the heat user 201 through the steam turbine 100. Excess steam is discharged through the air exhaust pipe 300, which is connected to the exhaust device pipe 400 via a tee. Before being sent to the air exhaust pipe 300, the excess steam is sent to the exhaust device 500 through the exhaust device pipe 400. It can also be further cooled and depressurized by the circulating pump pipe before being discharged into the exhaust device 500. The spray water in the main body condensate expansion tank 600 flows naturally into the exhaust device 500 and is sent to the exhaust device 500 through the circulating pump pipe. The excess steam is cooled and recovered after being sprayed by the spray water to prevent waste of working fluid and heat.

[0046] In some embodiments of this application, the system further includes: a first control valve 401, disposed at one end of the exhaust device pipeline 400 near the air exhaust pipeline 300, for connecting the exhaust device pipeline 400 according to the current steam temperature of the turbine 100; and a second control valve 301, disposed in the air exhaust pipeline 300, for connecting the air exhaust pipeline 300 according to the current steam temperature of the turbine 100.

[0047] In this embodiment, the opening and closing of the exhaust pipe 400 and the air exhaust pipe 300 are controlled by the first control valve 401 and the second control valve 301. The first control valve 401 and the second control valve 301 are both closed when the steam turbine 100 starts running to ensure sufficient gas supply for heat users. When the steam temperature of the steam turbine 100 reaches a certain value, the first control valve 401 and the second control valve 301 are opened successively.

[0048] In some embodiments of this application, a steam control module is further included, used to acquire the steam temperature of the steam turbine 100, and to open the first control valve 401 when the steam temperature of the steam turbine 100 is greater than T1, and to open the second control valve 301 when the steam temperature of the steam turbine 100 is greater than T2; the steam control module is also used to acquire the steam temperature rise rate of the steam turbine 100, and to close the first control valve 401 and directly open the second control valve 301 when the steam temperature rise rate of the steam turbine 100 is greater than a first preset rate threshold within a preset time, and to open the first control valve 401 when the steam temperature rise rate of the steam turbine 100 drops to a second preset rate threshold within a preset time.

[0049] In this embodiment, when the gas consumption of the heat user drops sharply, the flow rate of the steam turbine 100 decreases, making it unable to remove the heat generated by the friction of the blower. Consequently, the steam temperature of the steam turbine 100 increases. This embodiment controls the connection between the exhaust pipe 400 and the vent pipe 300 via a steam control module. When the steam temperature of the steam turbine 100 is lower than the normal temperature T1, both the first control valve 401 and the second control valve 301 are closed. When the steam temperature of the steam turbine 100 is higher than T1, the first control valve 401 is opened to connect the exhaust pipe 400. At this time, the vent pipe 300 remains closed, and steam can enter the exhaust device 500 for cooling through the exhaust pipe 400. If the steam temperature of turbine 100 continues to rise and exceeds T1 by 50°C, reaching T2, the second control valve 301 is opened to connect the exhaust pipe 300 to the air, discharging excess steam and increasing the flow rate of turbine 100. The steam temperature rise rate of turbine 100 is the temperature change ΔT of the steam temperature of turbine 100 within 5 minutes. If the steam temperature rise rate of turbine 100 is greater than T2 / 5min, the first control valve 401 is closed and the second control valve 301 is opened directly to prevent the system from becoming unsustainable due to overheating and causing danger. The first control valve 401 is opened only when the steam temperature rise rate of turbine 100 drops to T1 / 5min.

[0050] In some embodiments of this application, the exhaust device 500 includes: a spray water outlet 501 connected to the circulating pump pipeline for delivering spray water to the circulating pump pipeline; a spray device 502 connected to the circulating pump pipeline for spraying spray water to steam; a first steam inlet 503 connected to the exhaust device pipeline 400; a second steam inlet 504 connected to the circulating pump pipeline; and a steam-water separator 505 disposed at the top of the exhaust device 500 for separating steam and water from the steam at the top of the exhaust device 500.

[0051] In this embodiment, the exhaust device 500 forms a water curtain by spraying water through the spray device 502 to cool and recover the steam. The spray device 502 is connected to the circulating pump pipeline. The spray water at the bottom of the exhaust device 500 is pressurized and sent to the upper spray device 502 through the circulating pump pipeline. The steam in the exhaust device pipeline 400 enters the first steam inlet 503, and the steam discharged from the circulating pump pipeline enters the second steam inlet 504. The spray device 502 sprays and cools the steam in the two steam inlets. The steam-water separator 505 set at the top of the exhaust device 500 separates the remaining steam into steam and water, recovers the separated water and discharges the separated steam, and recovers as much working fluid as possible.

[0052] In some embodiments of this application, the circulating pump pipeline includes: a steam-driven circulating pump pipeline 511, one end of which is connected to the exhaust device pipeline 400 via a tee, and the other end of which is connected to a steam-driven circulating pump 512; a steam pipeline 513, one end of which is connected to the steam-driven circulating pump 512, and the other end of which is connected to the second steam inlet 504; a spray water outlet pipeline 514, one end of which is connected to the spray water outlet 501, and the other end of which is connected to the steam-driven circulating pump 512; and a spray water inlet pipeline 515, one end of which is connected to the steam-driven circulating pump 512, and the other end of which is connected to the spray device 502.

[0053] In this embodiment, the spray water is discharged from the hydrophobic expansion container 600 to the exhaust steam device 500. The spray water in the spray water outlet pipe 514 is sent to the spray water inlet pipe 515 by the steam-driven circulation pump 512, so that the spray water enters the spray device 502 to form a water curtain. The steam discharged from the steam-driven circulation pump 512 enters the second steam inlet 504 of the exhaust steam device 500 through the steam pipe 513.

[0054] In some embodiments of this application, the circulation pump pipeline further includes an electric circulation pump 516, which is connected in parallel to the pneumatic circulation pump 512 to assist the pneumatic circulation pump 512 in starting.

[0055] In this embodiment, the pneumatic circulation pump 512 is started simultaneously when the first control valve 401 is opened. Since the pneumatic circulation pump 512 requires a certain start-up time, an electric circulation pump 516 is connected in parallel to assist the start-up of the pneumatic circulation pump 512. When the pneumatic circulation pressure is sufficient, the electric circulation pump 516 is stopped and the electric circulation pump 516 is used as a backup for the pneumatic circulation pump.

[0056] In some embodiments of this application, the circulating pump pipeline further includes: a deaerator pipeline 521, one end of which is connected to the spray water inlet pipeline 515 via a tee, and the other end of which is connected to a deaerator 522, the deaerator 522 being used to store the spray water discharged by the steam-driven circulating pump 512; and a demineralized water pipeline 524, one end of which is connected to demineralized water 525, and the other end of which is connected to the spray water inlet pipeline 515, the demineralized water pipeline 524 being used to discharge the demineralized water 525 to the exhaust device 500 through the spray water inlet pipeline 515.

[0057] In this embodiment, a deaerator pipeline 521 is provided to send steam that cannot be discharged to the exhaust device pipeline 400 into the deaerator 522, and at the same time, demineralized water 525 is used to replace the spray water in the spray water inlet pipeline 515 for spraying, so as to prevent the exhaust device 500 from operating under overload.

[0058] In some embodiments of this application, the circulating pump pipeline further includes: a third control valve 527, located at the end of the spray water inlet pipeline 515 away from the demineralized water pipeline 524, for closing the spray water inlet pipeline 515 according to the exhaust water temperature; a fourth control valve 523, located in the deaerator pipeline 521, for connecting the deaerator pipeline 521 according to the exhaust water temperature; and a fifth control valve 526, located in the demineralized water pipeline 524, for connecting the demineralized water pipeline 524 according to the exhaust water temperature.

[0059] In this embodiment, the third control valve 527 is located between the deaerator pipeline 521 and the demineralized water pipeline 524. When the water temperature of the exhaust device is too high, the third control valve 527 can close the connection between the spray water inlet pipeline 515 and the exhaust device 500, thereby opening the fourth control valve 523 to connect the deaerator pipeline 521. The spray water is pumped to the deaerator 522 by the steam-driven circulation pump 512, and the fifth control valve 526 is opened to use demineralized water 525 to replace the spray water for spraying.

[0060] In some embodiments of this application, the circulating pump pipeline further includes: a spray water control module, used to obtain the water temperature of the exhaust device, and when the water temperature of the exhaust device is greater than T3, to close the third control valve 527 and open the fourth control valve 523 and the fifth control valve 526.

[0061] In this embodiment, to prevent the water temperature in the exhaust device 500 from becoming too high and causing it to overload, the spray water control module controls the closure of the spray water inlet pipe 515 and simultaneously controls the opening of the deaerator pipe 521 and the demineralized water pipe 524. The third control valve 527 is normally open, while the fourth control valve 523 and the fifth control valve 526 are closed. When the spray water control module detects that the water temperature in the exhaust device 500 is greater than T3, it closes the third control valve 527 to prevent high-temperature spray water from entering the exhaust device 500 and thus reduce its temperature. In this case, the fourth control valve 523 is opened, allowing the spray water to be sent to the deaerator 522 through the deaerator pipeline 521. At the same time, to ensure the normal operation of the exhaust device 500, the fifth control valve 526 is opened to send the demineralized water 525 to the spray device 502 for spraying. The fifth control valve 526 is also equipped with a backflow stop valve at the end away from the demineralized water 525 to prevent the demineralized water from flowing back. The fourth control valve 523 is connected in parallel with an emergency drain pipeline 528. It is worth noting that the water temperature T3 of the exhaust device can be adjusted according to the high temperature resistance of the specific exhaust device. In this embodiment, T3 is set to 60°C.

[0062] In some embodiments of this application, the hydrophobic expansion pipe 601 is provided with a gate valve 602.

[0063] In this embodiment, the flow rate of water in the main body condensate expansion container 600 is adjusted by the gate valve 602 when it is discharged into the steam exhaust device 500.

[0064] By applying the above technical solutions, the turbine waste heat recovery system provided in this embodiment of the invention, when the gas consumption of heat users decreases sharply, causing the steam temperature of the turbine 100 to be higher than the normal temperature, divides the steam into two paths through the exhaust device pipeline 400. One path is directly discharged to the exhaust device 500, and the other path enters the exhaust device 500 through the steam-driven circulation pump 512. The steam-driven circulation pump 512 sends the spray water flowing into the bottom of the exhaust device 500 from the main body condensate expansion container 600 to the spray device 502, forming a water curtain to spray and cool the lower steam. The top steam is separated by the steam-water separator 505 and the separated water is recovered. When the water temperature in the exhaust device 500 is higher than 60°C, the spray water inlet pipeline 515 is closed to prevent the exhaust device 500 from being overloaded. At this time, the deaerator pipeline 521 is opened and the spray water is pumped to the deaerator 522 through the steam-driven circulation pump 512, and the demineralized water pipeline 524 is opened to use demineralized water 525 to replace the spray water for spraying. When the steam temperature of the turbine exceeds the normal temperature by 50°C, or the steam temperature rises too quickly, the exhaust system will be activated to discharge the overheated steam and prevent the system from overheating and affecting normal operation.

[0065] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0066] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0067] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0068] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A steam turbine waste heat recovery system, comprising a steam turbine and a main body hydrophobic expansion tank, characterized in that, include: The heat user pipeline is connected to the steam turbine at one end and to the heat user at the other end. An exhaust pipe is provided to the air, with one end connected to the heat user pipe via a tee and the other end venting to the air. The exhaust pipe has one end connected to the air exhaust pipe via a tee, and the other end connected to the exhaust device. The circulating pump pipeline is connected at one end to the exhaust device pipeline via a tee, and at the other end to the exhaust device. The hydrophobic expansion container pipeline is connected at one end to the exhaust device and at the other end to the main hydrophobic expansion container. The system also includes: A first control valve is installed at one end of the exhaust device pipeline near the air exhaust pipeline, and is used to connect the exhaust device pipeline according to the current steam temperature of the steam turbine. The second control valve is installed in the exhaust pipe and is used to connect the exhaust pipe according to the current steam temperature of the turbine. The system also includes: The steam control module is used to obtain the steam temperature of the steam turbine. When the steam temperature of the steam turbine is greater than T1, the first control valve is opened, and when the steam temperature of the steam turbine is greater than T2, the second control valve is opened. The steam control module is also used to obtain the steam temperature rise rate of the steam turbine. When the steam temperature rise rate of the steam turbine is greater than the first preset rate threshold within a preset time, the first control valve is closed and the second control valve is opened directly. When the steam temperature rise rate of the steam turbine drops to the second preset rate threshold within a preset time, the first control valve is opened.

2. The turbine waste heat recovery system according to claim 1, characterized in that, The exhaust device includes: The spray water outlet is connected to the circulating pump pipeline and is used to send spray water to the circulating pump pipeline. A spraying device, connected to the circulating pump pipeline, is used to spray spray water onto steam; The first steam inlet is connected to the exhaust device pipeline; The second steam inlet is connected to the circulating pump pipeline; A steam-water separator is installed at the top of the exhaust device to separate the steam at the top of the exhaust device into steam and water.

3. The turbine waste heat recovery system according to claim 2, characterized in that, The circulating pump pipeline includes: The steam-driven circulating pump pipeline is connected to the exhaust device pipeline at one end via a tee, and the steam-driven circulating pump is connected at the other end. A steam pipeline, one end of which is connected to the steam-driven circulating pump, and the other end of which is connected to the second steam inlet; The spray water outlet pipeline is connected at one end to the spray water outlet and at the other end to the steam-driven circulation pump. The spray water inlet pipe is connected to the pneumatic circulation pump at one end and to the spray device at the other end.

4. The turbine waste heat recovery system according to claim 3, characterized in that, The circulating pump pipeline also includes: An electric circulating pump is connected in parallel to the pneumatic circulating pump to assist the pneumatic circulating pump in starting.

5. The turbine waste heat recovery system according to claim 3, characterized in that, The circulating pump pipeline also includes: The deaerator pipeline is connected to the spray water inlet pipeline at one end via a tee, and the other end is connected to the deaerator. The deaerator is used to store the spray water discharged by the steam-driven circulating pump. The demineralized water pipeline has demineralized water connected at one end and the spray water inlet pipeline at the other end. The demineralized water pipeline is used to discharge demineralized water to the exhaust device through the spray water inlet pipeline.

6. The turbine waste heat recovery system according to claim 5, characterized in that, The circulating pump pipeline also includes: The third control valve is located at the end of the spray water inlet pipe away from the demineralized water pipe, and is used to close the spray water inlet pipe according to the water temperature of the exhaust device. The fourth control valve is installed in the deaerator pipeline and is used to connect the deaerator pipeline according to the water temperature of the exhaust steam device. The fifth control valve is installed in the demineralized water pipeline and is used to connect the demineralized water pipeline according to the water temperature of the exhaust device.

7. The turbine waste heat recovery system according to claim 6, characterized in that, The circulating pump pipeline also includes: The spray water control module is used to obtain the water temperature of the exhaust device. When the water temperature of the exhaust device is greater than T3, the third control valve is closed and the fourth and fifth control valves are opened.

8. The turbine waste heat recovery system according to claim 1, characterized in that, The hydrophobic expansion container pipeline is equipped with a gate valve.

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