Waste steam waste heat recovery and utilization system with hydrophobic function and its operation method

Abstract

This application relates to the technical field of power plant energy conservation, and particularly relates to a waste steam waste heat recovery and utilization system with a hydrophobic function and its operation method, including a high-pressure and intermediate-pressure cylinder of a steam turbine, a low-pressure cylinder of the steam turbine, a hot well, an ejector device, and a hydrophobic device. Among them, a first pipeline and a second pipeline are arranged on the high-pressure and intermediate-pressure cylinder of the steam turbine, and one end of the first pipeline far from the high-pressure and intermediate-pressure cylinder of the steam turbine is communicated with the low-pressure cylinder of the steam turbine. One end of the second pipeline far from the high-pressure and intermediate-pressure cylinder of the steam turbine is communicated with the ejector device. A third pipeline is arranged on the low-pressure cylinder of the steam turbine, and one end of the third pipeline far from the low-pressure cylinder of the steam turbine is respectively communicated with the hot well and the ejector device, and a fourth pipeline is communicated between the ejector device and the hot well. The hydrophobic device includes a water seal assembly and an opening and closing control assembly, the opening and closing control assembly and the water seal assembly are respectively communicated with the fourth pipeline, and the opening and closing control assembly is used to control the on-off of the fourth pipeline. This application has the effect of facilitating the discharge of the hydrophobic water in the ejector device.

Description

Technical Field

[0001] This application relates to the technical field of power plant energy conservation, and particularly relates to a waste steam waste heat recovery and utilization system with a hydrophobic function and its operation method. Background Art

[0002] Currently, the working principle of an ejector is as follows: the potential energy of high-pressure air flow is converted into kinetic energy through a nozzle, so that the high-pressure air flow forms a high-speed ejector flow at the nozzle and enters to drive and attract low-pressure gas to be fully mixed in the mixing section of the ejector. The mixed fluid is ejected out of the ejector after decelerating and increasing pressure. Among them, the ejector flow can be subsonic or supersonic.

[0003] Regarding the above related technologies: when the ejector device starts and stops, a large amount of hydrophobic water will be generated due to the condensation of steam in the ejector device, and it is not easy to discharge, resulting in an adverse impact on the normal operation of the ejector device. Summary of the Invention

[0004] In order to facilitate the discharge of hydrophobic water in the ejector device, this application provides a waste steam waste heat recovery and utilization system with a hydrophobic function and its operation method.

[0005] In a first aspect, this application provides a waste steam waste heat recovery and utilization system with a hydrophobic function, adopting the following technical solutions:

[0006] A waste steam waste heat recovery and utilization system with a hydrophobic function includes:

[0007] A high-pressure and intermediate-pressure cylinder of a steam turbine, on which a first pipeline and a second pipeline are arranged;

[0008] A low-pressure cylinder of a steam turbine, one end of the first pipeline far from the high-pressure and intermediate-pressure cylinder of the steam turbine is communicated with the low-pressure cylinder of the steam turbine, and a third pipeline is communicated with the low-pressure cylinder of the steam turbine;

[0009] A hot well, which is communicated with one end of the third pipeline far from the low-pressure cylinder of the steam turbine;

[0010] An ejector device, which is respectively communicated with the second pipeline and the third pipeline, and a fourth pipeline is communicated between the ejector device and the hot well;

[0011] A hydrophobic device, which is communicated with the fourth pipeline, the hydrophobic device includes a water seal assembly and an opening and closing control assembly, the water seal assembly and the opening and closing control assembly are respectively communicated with the fourth pipeline, the opening and closing control assembly is located between the water seal assembly and the ejector device, and the opening and closing control assembly is used to control the on-off of the fourth pipeline.

[0012] By adopting the above technical solution, when the ejector device works, the high-pressure steam in the high-pressure and intermediate-pressure cylinders of the steam turbine enters the ejector device through the second pipeline, and is converted into a high-speed ejector flow in the ejector device, so that a negative pressure is generated in the ejector device. At this time, the low-pressure exhaust steam in the low-pressure cylinder of the steam turbine is drawn into the ejector device through the third pipeline to be mixed with the high-pressure steam, and there is also a negative pressure in the fourth pipeline. When the ejector device starts or pauses working, the opening and closing control component is opened to connect the fourth pipeline, so that the condensate generated by the steam condensation in the ejector device will be attracted into the fourth pipeline, and the condensate will flow through the fourth pipeline into the water seal component, which is convenient for discharging the condensate in the ejector device, and the water seal component can hinder the flow of gas, and to a certain extent reduces the possibility that when discharging the condensate, the outside gas flows into the ejector device, resulting in the destruction of the vacuum state inside the ejector device.

[0013] Optionally, the water seal component includes a U-shaped water seal pipe, and the U-shaped water seal pipe is communicated with the fourth pipeline.

[0014] By adopting the above technical solution, the setting of the U-shaped water seal pipe enables the condensate discharged from the ejector device to flow into the hot well through the U-shaped water seal pipe, and is conducive to reducing the possibility that air enters the ejector device through the U-shaped water seal pipe and destroys the vacuum state inside the ejector device.

[0015] Optionally, a plurality of U-shaped water seal pipes are provided, the heights of the plurality of U-shaped water seal pipes are different, and the plurality of U-shaped water seal pipes are arranged from high to low along the flow direction of the condensate in the fourth pipeline.

[0016] By adopting the above technical solution, the plurality of U-shaped water seal pipes are arranged from high to low, so that the condensate stored in the hot well is not easily refluxed into the ejector device through the U-shaped water seal pipe.

[0017] Optionally, the opening and closing control component includes a vacuum electric valve, the vacuum electric valve is communicated with the fourth pipeline, and the vacuum electric valve is located between the water seal component and the ejector device.

[0018] By adopting the above technical solution, the setting of the vacuum electric valve facilitates the control of the on-off of the fourth pipeline, which is conducive to reducing the possibility that the negative pressure generated when the ejector device works is too large, resulting in the water in the water seal component being attracted into the fourth pipeline and flowing into the ejector device through the fourth pipeline, which has an adverse effect on the operation of the ejector device, and is conducive to reducing the possibility that insufficient negative pressure cannot be formed in the fourth pipeline, resulting in the difficulty of discharging the condensate in the ejector device.

[0019] Optionally, the opening and closing control component includes a sealing pipe, an elastic member, and a slider. The sealing pipe is communicated with the fourth pipeline. One end of the sealing pipe away from the fourth pipeline is closed. The elastic member is arranged in the sealing pipe. The slider is slidably inserted into the sealing pipe. The circumferential side wall of the slider fits with the inner wall of the sealing pipe. One end of the slider close to the sealing pipe is connected to the elastic member. The slider is used to close the fourth pipeline.

[0020] By adopting the above technical solution, when the ejector device works, a negative pressure is formed in the fourth pipeline. The negative pressure and the elastic member act on the slider together, so that the slider can move in the sealing pipe to the position where the sealing pipe is communicated with the fourth pipeline to close the fourth pipeline. At this time, a negative pressure still exists in the fourth pipeline. When the ejector device pauses working, there is a negative pressure in the fourth pipeline, so that the hydrophobic water in the ejector device flows into the fourth pipeline. The hydrophobic water exerts a thrust on the slider, so that the slider moves towards the closed end of the sealing pipe, and the slider no longer closes the fourth pipeline, which is beneficial to automatically control the opening and closing of the fourth pipeline, and further beneficial to automatically control the hydrophobic water in the ejector device to flow into the fourth pipeline.

[0021] Optionally, the opening and closing control component further includes a limiting ring. The limiting ring is arranged in the fourth pipeline. The limiting ring is located at the communication position between the fourth pipeline and the sealing pipe. The limiting ring abuts against the slider.

[0022] By adopting the above technical solution, the setting of the limiting ring is beneficial to limit the slider, so that when the slider moves in the direction away from the sealing pipe, the slider can stay at the communication position between the sealing pipe and the fourth pipeline to close the fourth pipeline.

[0023] Optionally, a buffer member is arranged at one end of the slider close to the limiting ring.

[0024] By adopting the above technical solution, the setting of the buffer member makes it difficult for the slider to collide excessively with the limiting ring when moving in the sealing pipe, which is beneficial to reducing the possibility of damage to the slider and the limiting ring.

[0025] Optionally, an inlet steam port, a suction steam port, and an exhaust steam port are arranged on the ejector device. The inlet steam port is communicated with one end of the second pipeline away from the high-pressure and intermediate-pressure cylinders of the steam turbine. The suction steam port is communicated with one end of the third pipeline away from the low-pressure cylinder of the steam turbine. The exhaust steam port is located at one end of the ejector device away from the inlet steam port. The exhaust steam port is communicated with a condenser through a pipeline.

[0026] By adopting the above technical solution, the settings of the inlet steam port, the suction steam port, and the exhaust steam port enable the exhausted steam discharged from the high-pressure and intermediate-pressure cylinders and the low-pressure cylinder of the steam turbine to be discharged into the condenser through the ejector device, so as to facilitate the recovery and utilization of the exhausted steam.

[0027] Optionally, a drain port is provided at the lowest position of the ejector device, and the drain port is communicated with one end of the fourth pipeline close to the drain device.

[0028] By adopting the above technical solution, the drain port is arranged at the lowest position of the ejector device, which is beneficial to discharging the drain water in the ejector device from the ejector device.

[0029] In a second aspect, the present application provides an operation method for a waste steam waste heat recovery and utilization system with a drain function, adopting the following technical solution:

[0030] An operation method for a waste steam waste heat recovery and utilization system with a drain function includes any one of the waste steam waste heat recovery and utilization systems with a drain function in the above content, and has the following steps:

[0031] Start the high-pressure and intermediate-pressure cylinders of the steam turbine and the ejector device;

[0032] The steam in the high-pressure and intermediate-pressure cylinders of the steam turbine is introduced into the ejector device;

[0033] The ejector device converts the steam into a high-speed ejecting flow, so that a negative pressure exists in the third pipeline;

[0034] Open the opening and closing control component;

[0035] The drain water in the ejector device is attracted into the fourth pipeline;

[0036] The drain water flows through the opening and closing control component and the water seal component in sequence in the fourth pipeline and flows into the hot well.

[0037] In summary, the present application includes at least one of the following beneficial technical effects:

[0038] 1. Through the mutual cooperation of the fourth pipeline, the ejector device, the opening and closing control component, the water seal component and the hot well, the drain water in the ejector device can be discharged into the hot well, and to a certain extent, the water seal device reduces the possibility that when the drain water in the ejector device is discharged, external gas flows into the ejector device and the vacuum state inside the ejector device is damaged;

[0039] 2. The arrangement of multiple U-shaped water seal pipes with different heights makes the drain water stored in the hot well not easily flow back into the ejector device through the U-shaped water seal pipes;

[0040] 3. Through the mutual cooperation of the sealing pipe, the elastic member, the slider and the limiting ring, it is beneficial to achieve the purpose of automatically controlling the drain water in the ejector device to flow into the hot well through the fourth pipeline. Description of the Drawings

[0041] Figure 1It is a schematic diagram of the overall structure of the waste steam waste heat recovery and utilization system with a hydrophobic function in Embodiment 1 of the present application.

[0042] Figure 2 It is a schematic diagram of the overall structure of the waste steam waste heat recovery and utilization system with a hydrophobic function in Embodiment 2 of the present application.

[0043] Figure 3 Is Figure 2 The partial enlarged view at position A in

[0044] Figure 4 Is Figure 3 The cross-sectional view in

[0045] Explanation of reference numerals:

[0046] 1, high-pressure and intermediate-pressure cylinder of steam turbine; 11, first pipeline; 12, second pipeline; 2, low-pressure cylinder of steam turbine; 21, third pipeline; 3, hot well; 4, ejector device; 41, steam inlet; 42, suction steam port; 43, exhaust port; 44, drain port; 5, drain device; 51, U-shaped water seal pipe; 52, opening and closing control assembly; 521, vacuum electric valve; 522, sealing pipe; 523, elastic member; 524, slider; 5241, buffer member; 525, limit ring; 6, fourth pipeline; 7, condenser; 71, waste steam heat network condenser; 72, steam ejector condenser. Detailed implementation manners

[0047] The following further elaborates on the present application in conjunction with the attached Figures 1-4 for a more detailed description.

[0048] The embodiment of the present application discloses a waste steam waste heat recovery and utilization system with a hydrophobic function.

[0049] Embodiment 1

[0050] Referring to Figure 1 , the waste steam waste heat recovery and utilization system with a hydrophobic function includes a high-pressure and intermediate-pressure cylinder 1 of a steam turbine, a low-pressure cylinder 2 of a steam turbine, a hot well 3, an ejector device 4, and a drain device 5. Among them, the high-pressure and intermediate-pressure cylinder 1 of the steam turbine, the low-pressure cylinder 2 of the steam turbine, and the hot well 3 are connected in sequence. The ejector device 4 is respectively connected to the high-pressure and intermediate-pressure cylinder 1 of the steam turbine and the low-pressure cylinder 2 of the steam turbine, so that the ejector device 4 can eject the waste steam in the high-pressure and intermediate-pressure cylinder 1 and the low-pressure cylinder 2 of the steam turbine. The ejector device 4, the drain device 5, and the hot well 3 are connected in sequence, so that the drain in the ejector device 4 can flow into the hot well 3. The drain device 5 is used to reduce the possibility that when the drain in the ejector device 4 flows into the hot well 3, external air enters the ejector device 4, resulting in the destruction of the vacuum state inside the ejector device 4.

[0051] Referring to Figure 1, a first pipeline 11 and a second pipeline 12 are respectively connected to the high and intermediate pressure cylinders 1 of the steam turbine. One end of the first pipeline 11 far from the high and intermediate pressure cylinders 1 of the steam turbine is connected to the low pressure cylinder 2 of the steam turbine. One end of the second pipeline 12 far from the high and intermediate pressure cylinders is connected to the ejector device 4.

[0052] Referring to Figure 1 , the arrangement of the first pipeline 11 and the second pipeline 12 enables the steam generated in the high and intermediate pressure cylinders 1 of the steam turbine to flow into the low pressure cylinder 2 of the steam turbine and the ejector device 4 respectively.

[0053] Referring to Figure 1 , a third pipeline 21 is connected to the low pressure cylinder 2 of the steam turbine. One end of the third pipeline 21 far from the low pressure cylinder 2 of the steam turbine is respectively connected to the hot well 3 and the ejector device 4.

[0054] Referring to Figure 1 , multiple types of hot wells 3 can be set. The hot well 3 in this embodiment can be the hot well 3 of the exhaust steam device of the air-cooled unit or the hot well 3 of the condenser 7 of the wet-cooled unit. The hot well 3 in this embodiment is mainly used to store the condensate of the air-cooled and the drain water in the ejector device 4.

[0055] Referring to Figure 1 , an inlet steam port 41, a suction steam port 42 and an exhaust steam port 43 are arranged on the ejector device 4. Among them, the inlet steam port 41 is arranged close to the high and intermediate pressure cylinders 1 of the steam turbine, and the inlet steam port 41 is connected to the second pipeline 12. The suction steam port 42 is arranged close to the third pipeline 21, and the suction steam port 42 is also connected to the third pipeline 21.

[0056] Referring to Figure 1 , the exhaust steam port 43 is arranged far from the inlet steam port 41, and the exhaust steam port 43 of the ejector device 4 is connected to the condenser 7 through a pipeline, so that the ejector device 4 can eject the exhausted steam into the condenser 7.

[0057] Referring to Figure 1 , a drain port 44 is also arranged at the lowest position of the ejector device 4. The drain port 44 is connected to a fourth pipeline 6, and one end of the fourth pipeline 6 far from the ejector device 4 is connected to the hot well 3, so as to facilitate the drain water in the ejector device 4 to flow into the hot well 3 through the fourth pipeline 6.

[0058] Referring to Figure 1 , multiple types of drain devices 5 can be set. The drain device 5 in this embodiment includes a water seal assembly and an opening and closing control assembly 52. The water seal assembly and the opening and closing control assembly 52 are respectively connected to the fourth pipeline 6, and the opening and closing control assembly 52 is located between the water seal assembly and the ejector device 4.

[0059] Referring to Figure 1, the water seal assembly can be set in various forms. In this embodiment, the water seal assembly is a U-shaped water seal pipe 51. The U-shaped water seal pipe 51 can reduce the possibility that air enters the ejector 4 through the fourth pipeline 6 and destroys the vacuum state in the ejector 4 without affecting the hydrophobic flow.

[0060] Refer to Figure 1 , multiple U-shaped water seal pipes 51 can be provided. The multiple U-shaped water seal pipes 51 are all connected to the fourth pipeline 6. The heights of the multiple U-shaped water seal pipes 51 are different, and the multiple U-shaped water seal pipes 51 are arranged from high to low along the flow direction of the hydrophobic water discharged from the ejector 4, which is beneficial to reducing the possibility that the hydrophobic water stored in the hot well 3 flows back into the ejector 4 through the fourth pipeline 6.

[0061] Refer to Figure 1 , the opening and closing control assembly 52 can also be set in various forms. In this embodiment, the opening and closing control assembly 52 is a vacuum electric valve 521. The vacuum electric valve 521 is connected to the fourth pipeline 6, and the vacuum electric valve 521 is located between the U-shaped water seal pipe 51 and the ejector 4, so as to facilitate controlling the on-off of the fourth pipeline 6 between the U-shaped water seal pipe 51 and the ejector 4.

[0062] Refer to Figure 1 , the condenser 7 can be set in various forms. In this embodiment, the condenser 7 includes an exhaust steam heat network condenser 71 and a steam ejector condenser 72. Among them, the exhaust steam heat network condenser 71 is connected to the third pipeline 21 through a pipeline, and the steam ejector condenser 72 is connected to the exhaust port 43 of the ejector 4 through a pipeline.

[0063] Refer to Figure 1 , the exhaust steam heat network condenser 71 is connected to the steam ejector condenser 72 through a pipeline, so that the exhaust steam in the exhaust steam heat network condenser 71 can flow to the steam ejector condenser 72. And after the water-side heat network circulating water is heated by the exhaust steam heat network condenser 71 and the steam ejector condenser 72, the heated water is transported to the heat-consuming equipment through the heat network water pipe connected to the exhaust steam heat network condenser 71 and the steam ejector condenser 72, which is convenient for recovering and utilizing the waste heat of the exhaust steam.

[0064] Refer to Figure 1 , when the exhaust steam is discharged and the exhaust steam pressure is greater than the specified value, the ejector 4 starts. First, the steam in the high and intermediate pressure cylinders 1 of the steam turbine is discharged into the ejector 4 through the second pipeline 12, and the ejector 4 converts the steam into a high-speed ejector flow. At this time, a negative pressure space is formed in the third pipeline 21, so that the exhaust steam discharged from the low-pressure cylinder 2 of the steam turbine into the third pipeline 21 is drawn into the ejector 4, and the exhaust steam is mixed with the high-speed ejector flow in the ejector 4. The mixed gas is drawn into the steam ejector condenser 72 by the ejector 4 to heat the heat network circulating water.

[0065] Reference Figure 1 Figure 1 Before the ejector device 4 starts running or when it stops running after a period of time, there is hydrophobic water inside the ejector device 4. At this time, the vacuum electric valve 521 needs to be opened so that the hydrophobic water inside the ejector device 4 can flow into the hot well 3 from the fourth pipeline 6.

[0066] The implementation principle of a waste steam waste heat recovery and utilization system with a hydrophobic function according to an embodiment of the present application is as follows: When the ejector device 4 starts or stops running, steam condensation inside the ejector device 4 will generate hydrophobic water. At this time, the vacuum electric valve 521 is opened to connect the fourth pipeline 6.

[0067] Then, the ejector device 4 converts the steam introduced into the high and intermediate pressure cylinders 1 of the steam turbine into a high-speed ejector flow, so that a negative pressure space is formed in the third pipeline 21, and the waste steam is drawn into the ejector device 4 to mix with the high-speed ejector flow inside the ejector device 4. At the same time, a negative pressure space is also formed in the fourth pipeline 6, so that the hydrophobic water inside the ejector device 4 is drawn into the fourth pipeline 6.

[0068] Finally, the hydrophobic water flows through the fourth pipeline 6 through the U-shaped water seal pipe 51 and finally flows into the hot well 3, so as to achieve the purpose of discharging the hydrophobic water inside the ejector device 4. And when the hydrophobic water inside the ejector device 4 is discharged, the vacuum electric valve 521 is closed so that the ejector device 4 is put into normal operation.

[0069] Embodiment 2

[0070] Reference Figure 2 Figure 2 The difference between Embodiment 2 and Embodiment 1 is that the opening and closing control component 52 is different.

[0071] Reference Figure 3 And Figure 4 Figure 4 The opening and closing control component 52 includes a sealing pipe 522, an elastic member 523, a slider 524 and a limit ring 525. Among them, one end of the sealing pipe 522 is closed, and the other end of the sealing pipe 522 is communicated with the fourth pipeline 6. The elastic member 523 is arranged inside the sealing pipe 522, the slider 524 is slidably inserted inside the sealing pipe 522, and the circumferential side wall of the slider 524 is attached to the inner wall of the sealing pipe 522. One end of the slider 524 close to the sealing pipe 522 is communicated with the elastic member 523. The limit ring 525 is fixedly connected to the inner wall of the fourth pipeline 6 and is arranged close to the connection between the sealing pipe 522 and the fourth pipeline 6.

[0072] Reference Figure 2 And Figure 4 Figure 4 The pipeline of the fourth pipeline 6 near the U-shaped water seal pipe 51 is arranged in a bent shape, and the sealing pipe 522 is arranged near the bent part of the fourth pipeline 6.

[0073] Reference Figure 4, there can be various types of elastic members 523. In this embodiment, the elastic member 523 is an assisting spring, and the assisting spring can help the slider 524 slide within the sealing tube 522, enabling the slider 524 to slide within the sealing tube 522 to the connection point between the sealing tube 522 and the fourth pipeline 6.

[0074] Referring to Figure 4 , the slider 524 can close the fourth pipeline 6, thus facilitating the control of the on / off of the fourth pipeline 6 by adjusting the position of the slider 524.

[0075] Referring to Figure 4 , when the slider 524 slides to a position where it can close the fourth pipeline 6, the limiting ring 525 can abut against one end of the slider 524 away from the elastic member 523, so that the limiting ring 525 can limit the slider 524, which is beneficial to reducing the possibility that the sliding distance of the slider 524 is too long and the slider 524 completely slides out of the sealing tube 522.

[0076] Referring to Figure 4 , a buffer member 5241 is provided at one end of the slider 524 away from the elastic member 523. There can be various types of buffer members 5241. In this embodiment, the buffer member 5241 is a buffer gasket. The setting of the buffer member 5241 makes it difficult for the slider 524 to collide excessively with the limiting ring 525 when the slider 524 slides within the sealing tube 522, which is beneficial to reducing the possibility of damage to the slider 524 and the limiting ring 525.

[0077] The implementation principle of the embodiment of this application is as follows: When it is necessary to drain the hydrophobic water and put the ejector device 4 into operation, the slider 524 slides under the action of the elastic member 523 to a position close to closing the fourth pipeline 6. Then, start the ejector device 4 to form a negative pressure space in the fourth pipeline 6. At this time, the gas pressure in the sealing tube 522 is greater than the gas pressure in the fourth pipeline 6, so that the slider 524 closes the fourth pipeline 6.

[0078] Then, pause the ejector device 4 so that the hydrophobic water in the ejector device 4 flows into the fourth pipeline 6. At this time, the hydrophobic water exerts a thrust on the slider 524, causing the slider 524 to move into the sealing tube 522. The slider 524 exerts a pressure on the elastic member 523, causing the elastic member 523 to compress. The slider 524 no longer closes the fourth pipeline 6, allowing the hydrophobic water in the ejector device 4 to flow into the fourth pipeline 6.

[0079] Finally, the hydrophobic water flows through the fourth pipeline 6 through the U-shaped water seal pipe 51 and finally flows into the hot well 3, thereby achieving the purpose of automatically discharging the hydrophobic water in the ejector device 4.

[0080] The embodiment of this application also discloses an operation method for a waste steam waste heat recovery and utilization system with a hydrophobic function.

[0081] An operation method for a waste steam waste heat recovery and utilization system with a hydrophobic function, comprising the following steps:

[0082] Start the high-pressure and intermediate-pressure cylinders 1 of the steam turbine, the low-pressure cylinder 2 of the steam turbine and the ejector device 4, so that the high-pressure steam in the high-pressure and intermediate-pressure cylinders 1 of the steam turbine is introduced into the ejector device 4;

[0083] The high-pressure steam is converted into a high-speed ejecting flow in the ejector device 4, so that the waste steam in the low-pressure cylinder 2 of the steam turbine is attracted into the ejector device 4 through the third pipeline 21;

[0084] There is a negative pressure in the fourth pipeline 6;

[0085] Open the opening and closing control component 52 to connect the fourth pipeline 6, so that the hydrophobic water in the ejector device 4 is drawn into the fourth pipeline 6;

[0086] The hydrophobic water flows in the fourth pipeline 6, passes through the opening and closing control component 52 and the U-shaped water seal pipe 51 in sequence, and finally flows into the hot well 3 for storage.

[0087] The above are all preferred embodiments of the present application. Without limiting the protection scope of the present application accordingly, therefore: All equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A waste steam waste heat recovery and utilization system with a hydrophobic function, characterized in that Comprising: A high and intermediate pressure cylinder (1) of a steam turbine, on which a first pipeline (11) and a second pipeline (12) are arranged; A low pressure cylinder (2) of a steam turbine, one end of the first pipeline (11) far from the high and intermediate pressure cylinder (1) of the steam turbine is communicated with the low pressure cylinder (2) of the steam turbine, and a third pipeline (21) is communicated with the low pressure cylinder (2) of the steam turbine; A hot well (3), which is communicated with one end of the third pipeline (21) far from the low pressure cylinder (2) of the steam turbine; An ejector device (4), which is respectively communicated with the second pipeline (12) and the third pipeline (21), and a fourth pipeline (6) is communicated between the ejector device (4) and the hot well (3); A drainage device (5), which is communicated with the fourth pipeline (6), the drainage device (5) includes a water seal assembly and an opening and closing control assembly (52), the water seal assembly and the opening and closing control assembly (52) are respectively communicated with the fourth pipeline (6), the opening and closing control assembly (52) is located between the water seal assembly and the ejector device (4), and the opening and closing control assembly (52) is used to control the on-off of the fourth pipeline (6); The ejector device (4) is provided with a steam inlet (41), a suction steam port (42) and an exhaust port (43), the steam inlet (41) is communicated with one end of the second pipeline (12) far from the high and intermediate pressure cylinder (1) of the steam turbine, the suction steam port (42) is communicated with one end of the third pipeline (21) far from the low pressure cylinder (2) of the steam turbine, the exhaust port (43) is located at one end of the ejector device (4) far from the steam inlet (41), and the exhaust port (43) is communicated with a condenser (7) through a pipeline; A drain port (44) is arranged at the lowest position of the ejector device (4), and the drain port (44) is communicated with one end of the fourth pipeline (6) close to the drainage device (5).

2. The waste steam waste heat recovery and utilization system with hydrophobic function according to claim 1, characterized in that, The water seal assembly includes a U-shaped water seal pipe (51), and the U-shaped water seal pipe (51) is communicated with the fourth pipeline (6).

3. The waste steam waste heat recovery and utilization system with a hydrophobic function according to claim 2, characterized in that, A plurality of the U-shaped water seal pipes (51) are provided, the heights of the plurality of U-shaped water seal pipes (51) are different, and the plurality of U-shaped water seal pipes (51) are arranged from high to low along the drainage flow direction in the fourth pipeline (6).

4. The waste steam waste heat recovery and utilization system with a hydrophobic function according to claim 1, characterized in that The opening and closing control assembly (52) includes a vacuum electric valve (521), the vacuum electric valve (521) is communicated with the fourth pipeline (6), and the vacuum electric valve (521) is located between the water seal assembly and the ejector device (4).

5. The waste steam waste heat recovery and utilization system with a hydrophobic function according to claim 1, wherein The opening and closing control assembly (52) includes a sealing pipe (522), an elastic member (523) and a sliding block (524). The sealing pipe (522) communicates with the fourth pipeline (6). One end of the sealing pipe (522) away from the fourth pipeline (6) is closed. The elastic member (523) is arranged in the sealing pipe (522). The sliding block (524) is slidably inserted into the sealing pipe (522). The circumferential side wall of the sliding block (524) fits against the inner wall of the sealing pipe (522). One end of the sliding block (524) close to the sealing pipe (522) is connected to the elastic member (523). The sliding block (524) is used to close the fourth pipeline (6).

6. The waste steam waste heat recovery and utilization system with a hydrophobic function according to claim 5, characterized in that, The opening and closing control assembly (52) further includes a limit ring (525). The limit ring (525) is arranged in the fourth pipeline (6). The limit ring (525) is located at the connection between the fourth pipeline (6) and the sealing pipe (522). The limit ring (525) abuts against one end of the sliding block (524) away from the elastic member (523).

7. The waste steam waste heat recovery and utilization system with a hydrophobic function according to claim 6, characterized in that, One end of the sliding block (524) close to the limit ring (525) is provided with a buffer member (5241).

8. A method for operating a waste steam waste heat recovery and utilization system with a hydrophobic function, including the waste steam waste heat recovery and utilization system with a hydrophobic function described in any one of claims 1-7, characterized in that, It includes the following steps: Start the high-pressure and intermediate-pressure cylinders (1) of the steam turbine and the ejector device (4); The steam in the high-pressure and intermediate-pressure cylinders (1) of the steam turbine is introduced into the ejector device (4); The ejector device (4) converts the steam into a high-speed ejecting flow, so that there is a negative pressure in the third pipeline (21); Open the opening and closing control assembly (52); The drain water in the ejector device (4) is attracted into the fourth pipeline (6); The drain water flows through the opening and closing control assembly (52) and the water seal assembly in sequence in the fourth pipeline (6) and then flows into the hot well (3).

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