A power plant steam turbine drainage waste heat recovery device

Abstract

The application provides a power plant steam turbine drainage waste heat recovery device, which comprises a recovery tank and a heat exchange assembly. The recovery tank has a cavity, a cooling inlet, a cooling outlet and a steam inlet in communication with the cavity. The cooling inlet is used for introducing a cooling medium. The steam inlet is located at the top of the recovery tank and is used for introducing steam generated by the power plant steam turbine. The heat exchange assembly comprises a flow guide component and a heat exchange component. The flow guide component comprises a flow guide piece which is movable relative to the steam inlet along the height direction of the recovery tank. The flow guide piece has a plurality of flow guide grooves which are arranged at intervals in the circumferential direction of the flow guide piece. The heat exchange component comprises a plurality of heat exchange pipes which are arranged at intervals in the axial direction of the recovery tank. The plurality of heat exchange pipes are arranged in one-to-one correspondence with the plurality of flow guide grooves, so that the steam flows into the heat exchange pipes through the flow guide grooves and exchanges heat with the cooling medium in the recovery tank. The power plant steam turbine drainage waste heat recovery device has the advantages of good reliability and high heat exchange efficiency.

Description

Technical Field

[0001] This invention belongs to the field of power plant waste heat recovery technology, specifically, it relates to a waste heat recovery device for power plant steam turbine condensate. Background Technology

[0002] In related technologies, the condensate from the power plant turbine waste heat recovery device is directly input into the pipeline, causing impact and vibration on the pipeline. In particular, the connection between the pipeline and the internal heat exchange pipeline is also impacted, leading to damage at the connection. Moreover, the condensate enters the heat exchange pipeline unevenly. Pipes with high flow rates have sufficient heat exchange, while pipes with low flow rates have insufficient heat exchange. This uneven heat exchange leads to a reduction in heat exchange efficiency. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a waste heat recovery device for power plant turbine condensate drains, which has the advantages of high reliability and high heat exchange efficiency.

[0005] The waste heat recovery device for power plant turbine condensate drainage in this embodiment of the invention includes a recovery tank and a heat exchange assembly.

[0006] The recovery tank has a cavity and a cooling inlet, a cooling outlet and a steam inlet communicating with the cavity. The cooling outlet is located above the cooling inlet, and the cooling inlet is used to introduce a cooling medium. The steam inlet is located at the top of the recovery tank and is used to introduce steam generated by the power plant turbine.

[0007] The heat exchange assembly includes a flow guiding component and a heat exchange component. At least a portion of the flow guiding component is disposed within the steam inlet to separate the steam inlet from the cavity. The flow guiding component includes a flow guide element, which is movable relative to the steam inlet along the height direction of the recovery tank. The flow guide element has multiple flow guide grooves, which are arranged at circumferential intervals along the flow guide element. The heat exchange component includes multiple heat exchange tubes, which are arranged at axial intervals around the recovery tank. Each heat exchange tube is arranged in a one-to-one correspondence with a multiple guide groove, so that steam flows into the heat exchange tubes through the guide grooves and exchanges heat with the cooling medium in the recovery tank.

[0008] The waste heat recovery device for power plant steam turbine condensate in this embodiment of the invention separates the steam inlet from the cavity through a flow guiding component. The flow guiding grooves arranged circumferentially on the flow guiding component disperse the concentrated steam into multiple stable streams, fundamentally eliminating the impact and oscillation of steam on pipes and connections, and preventing micro-cracks or fatigue fractures in welds or sealing surfaces due to long-term water hammer. Simultaneously, the flow guiding grooves correspond one-to-one with the heat exchange tubes, achieving uniform steam distribution among the tubes and ensuring balanced heat exchange in each tube, thus solving the inefficiency problem caused by uneven heat exchange in the prior art. The flow guiding component can move along the height direction, flexibly adjusting the steam inlet buffer space to adapt to fluctuations in operating conditions. The counter-current arrangement of the cooling medium (bottom inlet, top outlet) further enhances the heat exchange temperature difference, significantly improving the overall reliability, uniformity, and efficiency of waste heat recovery.

[0009] In some embodiments, the flow guiding component further includes a partition base plate, a sleeve, and a first elastic member. The partition base plate is disposed within the steam inlet to separate the steam inlet from the cavity. A first end of the sleeve is connected to the partition base plate, and a second end of the sleeve is used to abut against the flow guiding component. A first end of the first elastic member is disposed within the sleeve, and a second end of the first elastic member abuts against the flow guiding component.

[0010] In some embodiments, the flow guiding component further includes a sleeve, a first end of which is disposed inside the sleeve, a first elastic element is located between the first end of the sleeve and the sleeve, and a second end of the sleeve is connected to the flow guiding component.

[0011] In some embodiments, the flow guiding component further includes a second elastic element, which is sleeved on the outer periphery of the sleeve, with a first end of the second elastic element connected to the partition base plate and a second end of the second elastic element connected to the flow guiding component.

[0012] In some embodiments, the flow guide includes a flow guide body and a flow guide plate, wherein there are multiple flow guide plates, which are arranged at circumferential intervals along the flow guide body, and a flow guide groove is defined between two adjacent flow guide plates.

[0013] In some embodiments, the cross-sectional area of ​​the flow guide body gradually decreases in the direction from bottom to top.

[0014] In some embodiments, the cross-sectional area of ​​the flow channel gradually decreases in the direction from bottom to top.

[0015] In some embodiments, the opening size at the lower end of the flow channel is approximately equal to the size of the inlet of the heat exchange tube.

[0016] In some embodiments, the extension length of the heat exchange tube is greater than the projected length of the heat exchange tube in the height direction of the recovery tank.

[0017] In some embodiments of the present invention, the waste heat recovery device for power plant turbine condensate drainage further includes a recovery component located at the bottom of the recovery tank and connected to the outlet of the heat exchange tube for collecting steam and / or liquid in the heat exchange tube after heat exchange with the cooling medium. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of a power plant turbine condensate waste heat recovery device according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the internal structure of the steam inlet of the power plant turbine condensate waste heat recovery device according to an embodiment of the present invention.

[0020] Figure 3 This is an exploded structural diagram of the flow guiding component of the waste heat recovery device for power plant turbine condensate drainage according to an embodiment of the present invention.

[0021] Figure label: 1. Recovery tank; 11. Cavity; 12. Cooling inlet; 13. Cooling outlet; 14. Steam inlet. 2. Flow guiding component; 21. Flow guiding element; 211. Flow guiding body; 212. Flow guiding plate; 213. Flow guiding groove; 22. Separating base plate; 23. Sleeve; 24. First elastic element; 25. Sleeve column; 26. Second elastic element. 3. Heat exchange components, 31. Heat exchange tubes, 4. Recycled parts. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] like Figures 1-3 As shown, the waste heat recovery device for power plant turbine condensate in this embodiment of the invention includes a recovery tank 1 and a heat exchange assembly.

[0024] The recovery tank 1 has a cavity 11 and a cooling inlet 12, a cooling outlet 13 and a steam inlet 14 communicating with the cavity 11. The cooling outlet 13 is located above the cooling inlet 12. The cooling inlet 12 is used to introduce a cooling medium. The steam inlet 14 is located at the top of the recovery tank 1. The steam inlet 14 is used to introduce steam generated by the power plant turbine.

[0025] like Figures 1-3As shown, cooling inlet 12 is located at the bottom of recovery tank 1 and communicates with cavity 11 for introducing cooling medium (such as cooling water). Cooling outlet 13 is located above cooling inlet 12 and also communicates with cavity 11 for discharging the cooled medium after heat exchange. Steam inlet 14 is located at the top of recovery tank 1 and communicates with cavity 11 for introducing steam (hydrophobic steam) generated by the power plant turbine.

[0026] In other words, the cooling medium flows in from the bottom and out from the top, forming natural or forced convection. This causes the temperature of the cooling medium in cavity 11 to gradually increase from top to bottom (or gradually decrease from bottom to top), which is beneficial for counter-current heat exchange with the steam entering from the top, increasing the heat exchange temperature difference and thus enhancing heat exchange efficiency. At the same time, the steam enters from the top, and by utilizing the upward flow tendency of the steam (which is lighter), it avoids the steam directly impacting the lower liquid surface due to gravity, thus reducing the initial impact to some extent.

[0027] The heat exchange assembly includes a flow guiding component 2 and a heat exchange component 3. At least a portion of the flow guiding component 2 is disposed within the steam inlet 14 to separate the steam inlet 14 from the cavity 11. The flow guiding component 2 includes a flow guide 21, which is movable relative to the steam inlet 14 along the height direction of the recovery tank 1. The flow guide 21 has a plurality of flow guide grooves 213, which are arranged circumferentially spaced along the flow guide 21. The heat exchange component 3 includes a plurality of heat exchange tubes 31, which are arranged around the axial direction of the recovery tank 1 (e.g., ...). Figure 1 The heat exchange tubes 31 are arranged at intervals in the vertical direction, and multiple heat exchange tubes 31 are arranged in a one-to-one correspondence with multiple guide channels 213, so that steam flows into the heat exchange tubes 31 through the guide channels 213 and exchanges heat with the cooling medium in the recovery tank 1.

[0028] like Figures 1-3 As shown, the flow guiding component 2 is at least partially disposed within the steam inlet 14, serving to separate the steam inlet 14 from the cavity 11. That is, steam cannot directly flow from the steam inlet 14 into the cavity 11, but must first pass through the flow guiding component 2. The flow guiding component 2 includes a flow guiding element 21, which is movable relative to the steam inlet 14 along the height direction of the recovery tank 1 (e.g., connected via threads, a slider, or a sealing sliding mechanism). The flow guiding element 21 has multiple flow guiding grooves 213, which are arranged at circumferential intervals along the flow guiding element 21 (e.g., in a ring array or spiral arrangement).

[0029] In other words, the flow guide component 2 separates the steam inlet 14 from the cavity 11, acting as a buffer chamber or guiding structure. This prevents the steam from directly impacting the cooling medium or heat exchange tube bundle 31 within the cavity 11, significantly reducing impact oscillations and protecting the connections and internal components. The flow guide component 21 can move along the height direction, meaning its position relative to the steam inlet 14 can be adjusted. This alters the pre-stroke or throttling degree of the steam before entering the flow guide channel 213, adapting to different operating conditions (such as changes in steam flow rate and pressure) and achieving flexible regulation. Multiple flow guide channels 213 are arranged circumferentially at intervals, ensuring the steam is evenly distributed in multiple directions, avoiding concentrated impacts.

[0030] In other words, the waste heat recovery device for power plant turbine condensate in this embodiment of the invention separates the steam inlet 14 from the cavity 11 through the guide component 2. The guide grooves 213 arranged circumferentially on the guide component 21 disperse the concentrated steam into multiple stable streams, fundamentally eliminating the impact and oscillation of steam on the pipes and connections, and avoiding micro-cracks or fatigue fractures in welds or sealing surfaces due to long-term water hammer. At the same time, the guide grooves 213 correspond one-to-one with the heat exchange tubes 31, realizing the uniform distribution of steam among the heat exchange tubes 31, making the heat exchange of each tube balanced, and solving the problem of low efficiency caused by uneven heat exchange in the prior art. The guide component 21 can move along the height direction, which can flexibly adjust the buffer space of the steam inlet to adapt to the fluctuation of operating conditions. The counter-current arrangement of the cooling medium entering from the bottom and exiting from the top further enhances the heat exchange temperature difference, and significantly improves the reliability, uniformity and efficiency of waste heat recovery as a whole.

[0031] In some embodiments, the flow guiding component 2 further includes a partition base plate 22, a sleeve 23, and a first elastic member 24. The partition base plate 22 is disposed inside the steam inlet 14 to separate the steam inlet 14 from the cavity 11. The first end of the sleeve 23 is connected to the partition base plate 22, and the second end of the sleeve 23 is used to abut against the flow guiding component 21. The first end of the first elastic member 24 is disposed inside the sleeve 23, and the second end of the first elastic member 24 abuts against the flow guiding component 21.

[0032] like Figures 1-3 As shown, the partition plate 22 is located inside the steam inlet 14, completely separating the steam inlet 14 from the cavity 11 of the recovery tank 1. This means that steam cannot directly enter the cavity 11 through the steam inlet 14, but can only enter the cavity 11 in an orderly manner through the subsequent guide channel 213. This further enhances the impact isolation effect, ensuring that steam will not directly scour the heat exchange tube bundle 31 or the tube wall inside the cavity 11 in any form, thereby eliminating damage to the connection points caused by impact oscillations.

[0033] The first end (i.e., the lower end) of the sleeve 23 is connected to the partition base plate 22 (e.g., by welding or threading), and the second end (i.e., the upper end) of the sleeve 23 is used to abut against the guide member 21. The sleeve 23 is located in the axial direction of the steam inlet 14, and the interior of the sleeve 23 is hollow to accommodate the first elastic member 24.

[0034] The first end of the first elastic element 24 (such as a spring) is located inside the sleeve 23 (i.e., fixed to the bottom of the sleeve 23 or abutting against the partition plate 22), and the second end abuts against the guide element 21 (i.e., abutting against the middle or end face of the guide element 21). Under the action of the first elastic element 24, the guide element 21 is always pushed towards the second end of the sleeve 23, forming an initial contact state.

[0035] It can be understood that when the steam flow or pressure fluctuates, the guide member 21 can overcome the elastic force and move in the vertical direction, while the first elastic member 24 is compressed or rebounded accordingly, converting the instantaneous impact kinetic energy into elastic potential energy, further weakening the water hammer effect. This adaptive adjustment allows the flow cross-section to automatically adjust with pressure changes, playing a role in dynamic pressure stabilization and vibration damping. Since the impact force is absorbed and smoothly released by the elastic member, the connection between the heat exchange tube 31 and the tube sheet (weld, flange) no longer bears high-frequency impact loads, extending fatigue life.

[0036] In some embodiments, the flow guiding component 2 further includes a sleeve 25, the first end of which is disposed inside the sleeve 23, the first elastic member 24 is located between the first end of the sleeve 25 and the sleeve 23, and the second end of the sleeve 25 is connected to the flow guiding component 21.

[0037] like Figures 1-3 As shown, the first end (i.e. the lower end) of the sleeve 25 is located inside the sleeve 23 and can slide along the inner wall of the sleeve 23; the first elastic member 24 is located between the first end of the sleeve 25 and the sleeve 23, that is, one end of the first elastic member 24 abuts against the end face or boss of the first end of the sleeve 25, and the other end abuts against the inside of the sleeve 23 (such as the bottom or inner step); the second end of the sleeve 25 is fixedly connected to the guide member 21 or integrally formed.

[0038] Understandably, the sleeve 25, as a rigid force transmission component, avoids the local stress concentration or uneven wear that may occur when the first elastic element 24 (spring) directly presses against the guide element 21, so that the elastic force is evenly applied to the central area of ​​the guide element 21, ensuring that the guide element 21 is subjected to balanced force.

[0039] The sleeve 25 slides inside the sleeve 23, providing precise axial guidance for the up-and-down floating of the guide 21, preventing the guide 21 from tilting or getting stuck under the action of steam impact or elastic force, thereby ensuring that the guide groove 213 is always aligned with the inlet of the heat exchange tube 31, maintaining the uniformity of steam distribution without deviation due to floating.

[0040] The first elastic element 24 is housed in the annular or axial space between the sleeve 25 and the sleeve 23, and is not in direct contact with external high-temperature steam (due to the sealing effect of the sleeve 23 and the sleeve 25), which reduces the possibility of the spring being annealed or corroded by heat, extends its service life, and maintains the long-term reliability of elastic buffering.

[0041] In some embodiments, the flow guiding component 2 further includes a second elastic element 26, which is sleeved on the outer periphery of the sleeve 23. The first end of the second elastic element 26 is connected to the partition bottom plate 22, and the second end of the second elastic element 26 is connected to the flow guiding component 21.

[0042] like Figures 1-3 As shown, the second elastic element 26 is sleeved around the outer periphery of the sleeve 23, that is, the second elastic element 26 surrounds the outer wall surface of the sleeve 23 and does not contact or interfere with the inner wall of the sleeve 23 and the first elastic element 24. The second elastic element 26 can be a spring or an elastic washer ring (elastic bellows, etc.). The first end of the second elastic element 26 is connected to the partition base plate 22 (e.g., by welding, snap-fitting, or directly abutting against the end face of the base plate). The second end of the second elastic element 26 is connected to the guide member 21 (e.g., abutting against the lower end face of the guide member 21).

[0043] Understandably, when steam impact force acts on the guide member 21, the two elastic elements are simultaneously compressed or stretched, jointly converting the impact kinetic energy into elastic potential energy. Compared with a single elastic element structure, it can withstand a greater instantaneous impact force, further reducing the damage of water hammer effect to the pipe and connection. The first elastic element 24 provides the central axial force, and the second elastic element 26 provides the peripheral axial force. The combined force of the two makes the force on the guide member 21 more uniform and symmetrical, avoiding tilting or swaying of the guide member 21 due to single-point force during floating, and ensuring that the guide channel 213 always maintains precise alignment with the inlet of the heat exchange tube 31.

[0044] Furthermore, if the performance of the first elastic element 24 deteriorates due to fatigue or corrosion, the second elastic element 26 can still independently provide some elastic support, maintaining the basic sealing and buffering functions of the guide element 21, thus improving the reliability of the device in long-term operation.

[0045] In some embodiments, the flow guide 21 includes a flow guide body 211 and a flow guide plate 212. There are multiple flow guide plates 212, which are arranged at intervals along the circumference of the flow guide body 211. A flow guide groove 213 is defined between two adjacent flow guide plates 212.

[0046] like Figures 1-3 As shown, the guide plates 212 are fixed to the guide body 211 (e.g., welded, integrally formed, or detachably installed) and are evenly arranged circumferentially. Each guide plate 212 has a certain radial height and circumferential thickness, and a guide groove 213 corresponding to the inlet of the heat exchange tube 31 is formed between adjacent guide plates 212.

[0047] Understandably, the guide vanes 212 can be individually machined and assembled onto the guide body 211, facilitating adjustments to the number, thickness, or spacing of the guide vanes 212 according to steam flow requirements. This changes the number of guide channels 213 and the total flow area, eliminating the need to remanufacture the entire guide component 21, reducing manufacturing difficulty and cost, and enabling rapid adaptation to different operating conditions. The sides of the guide vanes 212 form smooth flow channel walls. When steam flows along the gaps between adjacent guide vanes 212, it is guided and rectified, reducing eddies and flow resistance, allowing steam to enter the corresponding heat exchange tubes 31 in a more stable state, further reducing impact energy transfer.

[0048] In addition, since the guide plate 212 is detachably connected to the guide body 211, when a certain guide plate 212 is worn or deformed due to long-term high-speed steam scouring, the guide plate 212 can be replaced separately instead of replacing the entire guide component 21, thus extending the overall service life and reducing maintenance costs.

[0049] In some embodiments, the cross-sectional area of ​​the flow guide body 211 gradually decreases in the direction from bottom to top.

[0050] It is understandable that, such as Figures 1-3 As shown, the guide body 211 is generally conical in shape. The gradually expanding guide body 211 naturally guides the steam to flow from the center to the surrounding guide grooves 213, avoiding the steam from being concentrated only in the central area and promoting uniform air intake in each guide groove 213.

[0051] The guide plate 212 is fixed to the outer periphery of the guide body 211, and a guide groove 213 is formed between adjacent guide plates 212. Since the guide body 211 has a large bottom cross section and a small top cross section, the root of the guide plate 212 is closer to the outer side at the bottom and closer to the center at the top. The guide plate 212 can be designed to be inclined or conformal, so that the inlet (top) and outlet (bottom) directions of the guide groove 213 follow the radial diffusion of the steam.

[0052] In addition, the conical body provides a larger bottom mounting space for the guide plate 212, which can accommodate more or wider guide plates 212, which is beneficial to increasing the number of guide channels 213 or the flow area of ​​a single guide channel 213.

[0053] In some embodiments, the cross-sectional area of ​​the guide channel 213 gradually decreases in the direction from bottom to top.

[0054] Understandably, the guide channel 213 is defined by the gap between two adjacent guide plates 212. If the cross-sectional area of ​​the guide channel 213 gradually decreases from bottom to top, that is, at the bottom of the guide channel 213 (near the inlet of the heat exchange tube 31), the width or depth of the guide channel 213 is larger, and the cross-sectional area is the largest; at the top of the guide channel 213 (near the inlet of the steam inlet 14), the width or depth of the guide channel 213 is smaller, and the cross-sectional area is the smallest.

[0055] Since the steam enters from the top steam inlet 14, it first reaches the top (small cross-section) of the guide channel 213 and then flows down to the bottom (large cross-section). Therefore, the steam undergoes a gradual expansion flow inside the guide channel 213. As it flows downward, the flow area gradually increases, the airflow velocity decreases, and the static pressure recovers.

[0056] In other words, the steam enters the guide channel 213 at a relatively high velocity from the top small cross-section, but immediately enters the gradually expanding channel where its velocity drops rapidly, converting kinetic energy into pressure energy. This allows the steam to enter the heat exchange tube 31 at a lower velocity and in a more stable state, significantly reducing the impact of the jet on the tube wall and connections. The gradually expanding channel causes the steam to adhere to the wall of the guide plate 212, making it less prone to eddies or backflow, thus protecting the guide plate 212 and the inlet of the heat exchange tube 31 from damage caused by high-speed airflow.

[0057] In some embodiments, the opening size at the lower end of the guide channel 213 is approximately equal to the size of the inlet of the heat exchange tube 31.

[0058] Understandably, if the outlet area of ​​the guide channel 213 is much larger than the inlet area of ​​the heat exchange tube 31, the steam will experience a sudden contraction upon entering the heat exchange tube 31, leading to localized eddies and pressure losses. Conversely, if the outlet area of ​​the guide channel 213 is much smaller than the inlet area of ​​the heat exchange tube 31, the steam will suddenly expand upon entering the heat exchange tube 31, similarly generating eddies and energy losses. When the dimensions are equal, the steam enters the heat exchange tube 31 with a continuous and smooth cross-section, resulting in minimal flow resistance and the lowest energy loss.

[0059] In other words, the opening at the lower end of the guide channel 213 is matched with the inlet of the heat exchange tube 31 so that the steam does not undergo drastic changes in flow rate and pressure when entering the heat exchange tube 31, avoiding secondary impacts and surges caused by sudden changes in the flow channel, thereby protecting the inlet section of the heat exchange tube 31 and the connecting weld.

[0060] In some embodiments, the extension length of the heat exchange tube 31 is greater than the projected length of the heat exchange tube 31 in the height direction of the recovery tank 1.

[0061] Optionally, the heat exchange tube 31 can be an inclined straight tube, a U-shaped tube, a spiral coil, or a serpentine tube, etc. That is, the height of the recovery tank 1 is limited, while the heat exchange between the steam and the cooling medium depends on the heat exchange area of ​​the heat exchange tube 31. By making the actual length of the heat exchange tube 31 greater than its projected length in the height direction, the effective heat exchange length of each heat exchange tube 31 can be increased without increasing the overall height of the recovery tank 1, thereby increasing the heat exchange area.

[0062] In some embodiments, the waste heat recovery device for power plant turbine condensate drainage in this invention further includes a recovery component 4. The recovery component 4 is disposed at the bottom of the recovery tank 1 and is connected to the outlet of the heat exchange tube 31 to collect the steam and / or liquid in the heat exchange tube 31 after heat exchange with the cooling medium.

[0063] like Figures 1-3 As shown, the recovery component 4 is located at the bottom of the recovery tank 1, below or in the bottom region of the cavity 11. The recovery component 4 is connected to the outlet of the heat exchange tube 31, that is, the lower outlet of each heat exchange tube 31 is collected to the recovery component 4 (which can be connected by a manifold, branch pipe or direct flange) to collect the steam (parts that are not completely condensed) and / or liquid (condensate) flowing out of the heat exchange tube 31.

[0064] Understandably, after releasing heat, the steam inside heat exchange tube 31 partially condenses into water. The gas-liquid mixture enters the recovery unit 4 through the outlet, where it is collected and treated, preventing direct discharge into the bottom of cavity 11 that could cause liquid level fluctuations or secondary impacts. The recovery unit 4 is directly connected to the outlet of heat exchange tube 31 and is located at the bottom of the tank, allowing for natural gravity-based drainage to ensure that condensate does not flow back into the heat exchange tube 31 and affect heat exchange. The recovered condensate is at a relatively high temperature and can be directly used as makeup water or preheated feedwater, achieving dual savings in both heat energy and water resources.

[0065] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0066] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A waste heat recovery device for steam turbine condensate drains in power plants, characterized in that, include: The recovery tank has a cavity and a cooling inlet, a cooling outlet and a steam inlet communicating with the cavity. The cooling outlet is located above the cooling inlet, and the cooling inlet is used to introduce a cooling medium. The steam inlet is located at the top of the recovery tank and is used to introduce steam generated by a power plant turbine. A heat exchange assembly includes a flow guiding component and a heat exchange component. At least a portion of the flow guiding component is disposed within the steam inlet to separate the steam inlet from the cavity. The flow guiding component includes a flow guide element that is movable relative to the steam inlet along the height direction of the recovery tank. The flow guide element has multiple flow guide grooves that are spaced apart circumferentially along the flow guide element. The heat exchange component includes multiple heat exchange tubes, which are arranged at axial intervals around the recovery tank. Each heat exchange tube is arranged in a one-to-one correspondence with a multiple guide groove, so that steam flows into the heat exchange tubes through the guide grooves and exchanges heat with the cooling medium in the recovery tank.

2. The waste heat recovery device for power plant steam turbine condensate drains according to claim 1, characterized in that, The flow guiding component further includes a partition base plate, a sleeve, and a first elastic element. The partition base plate is disposed inside the steam inlet to separate the steam inlet from the cavity. The first end of the sleeve is connected to the partition base plate, and the second end of the sleeve is used to abut against the flow guiding component. The first end of the first elastic element is disposed inside the sleeve, and the second end of the first elastic element abuts against the flow guiding component.

3. The waste heat recovery device for power plant turbine condensate drains according to claim 2, characterized in that, The flow guiding component further includes a sleeve, the first end of which is disposed inside the sleeve, the first elastic element is located between the first end of the sleeve and the sleeve, and the second end of the sleeve is connected to the flow guiding component.

4. The waste heat recovery device for power plant turbine condensate drains according to claim 2, characterized in that, The flow guiding component further includes a second elastic element, which is sleeved on the outer periphery of the sleeve. The first end of the second elastic element is connected to the partition base plate, and the second end of the second elastic element is connected to the flow guiding component.

5. The waste heat recovery device for power plant steam turbine condensate drains according to claim 1, characterized in that, The flow guide includes a flow guide body and flow guide plates. There are multiple flow guide plates, which are arranged at intervals along the circumference of the flow guide body. A flow guide groove is defined between two adjacent flow guide plates.

6. The waste heat recovery device for power plant steam turbine condensate drains according to claim 5, characterized in that, The cross-sectional area of ​​the flow guide body gradually decreases in the direction from bottom to top.

7. The waste heat recovery device for power plant steam turbine condensate drains according to claim 5, characterized in that, The cross-sectional area of ​​the guide channel gradually decreases from bottom to top.

8. The waste heat recovery device for power plant steam turbine condensate drains according to claim 7, characterized in that, The opening size at the lower end of the flow guide groove is approximately equal to the size of the inlet of the heat exchange tube.

9. The waste heat recovery device for power plant steam turbine condensate drains according to claim 1, characterized in that, The extension length of the heat exchange tube is greater than the projected length of the heat exchange tube in the height direction of the recovery tank.

10. The waste heat recovery device for power plant steam turbine condensate drains according to claim 1, characterized in that, It also includes a recovery component located at the bottom of the recovery tank and connected to the outlet of the heat exchange tube for collecting the steam and / or liquid in the heat exchange tube after heat exchange with the cooling medium.

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