Thermal power plant and thermal power plant flue condensate collecting and discharging device

Abstract

The utility model relates to the field of thermal power generation, and discloses a thermal power plant and a thermal power plant flue condensate collecting and discharging device, which can collect condensate along the flow direction of condensate on the inner wall of a flue of the thermal power plant and avoid chimney rain formed by discharging smoke with liquid drops. Comprising a liquid collecting runner, a high-position collecting box, a low-position collecting box and a liquid discharging pipe. The liquid collecting flow channel is attached to the top, the bottom and the side wall of the horizontal flue, high-position collecting boxes are arranged on the two sides of the top liquid collecting flow channel, low-position collecting boxes are arranged on the two sides of the bottom liquid collecting flow channel, the side wall liquid collecting flow channel is arranged in a mode of inclining to the horizontal plane, and the bottom of the side wall liquid collecting flow channel extends into the condensate collecting box located at the bottom of the horizontal flue. A liquid discharge pipe communicated with the condensate collecting box is arranged outside the horizontal flue, and condensate flows into the condensate collecting box from the liquid collecting flow channel and then is discharged through the liquid discharge pipe. The opening direction of the liquid collecting flow channel right faces the flue gas flow direction of the thermal power plant, and the bottom face of the liquid collecting flow channel inclines upwards and is clamped with the vertical face of the liquid collecting flow channel to form a condensate collecting cavity used for collecting condensate.

Description

Technical Field

[0001] This application relates to the field of thermal power generation, specifically to a thermal power plant and a device for collecting and discharging condensate from the flue of a thermal power plant. Background Technology

[0002] With increasing demands for environmental protection and energy efficiency, thermal power plants have widely adopted wet desulfurization processes and have eliminated the need for GGH (flue gas reheater). Under these conditions, the flue gas temperature is low, leading to severe condensation inside the chimney. The flue gas discharged from wet desulfurization processes contains a large amount of saturated water vapor. When the ambient temperature is low, this water vapor condenses into droplets on the inner wall of the chimney, causing condensate accumulation. This condensate, often accompanied by gypsum droplets produced by wet desulfurization, adheres to the inner wall of the chimney, making it susceptible to corrosion.

[0003] Furthermore, condensate forms a liquid film on the inner wall of the chimney, while the airflow inside the flue is uneven, with numerous turbulent areas and potentially high local airflow velocities, causing droplets to re-enter the airflow. When the flue gas velocity is high, the droplets will be discharged from the chimney along with the flue gas, creating a "chimney rain" phenomenon at the outlet, polluting the environment and increasing the risk of corrosion to surrounding equipment and buildings.

[0004] Current condensate collection systems typically include a bidirectional inclined collection ring on the inner wall of the chimney, multiple high and low-level collection ports, and a condensate drain pipe, designed to collect condensate and guide it to the discharge outlet. However, this system has design limitations. The T-shaped profile of the collection ring is arranged obliquely along the circumference, but due to factors such as turbulent airflow and uneven airflow velocity on the inner wall of the chimney, condensate collection is often ineffective. Especially in situations with uneven wall surfaces or discontinuous airflow, droplets are easily re-introduced into the airflow, thus exacerbating chimney rain formation.

[0005] In summary, existing technologies are insufficient in the comprehensive collection and discharge of condensate, making it difficult to effectively solve the risks of condensate corrosion to the chimney wall and the problem of chimney rain. Summary of the Invention

[0006] The purpose of this application is to provide a thermal power plant and a device for collecting and discharging condensate from the flue of a thermal power plant, which can efficiently collect condensate in accordance with the flow direction of condensate on the inner wall of the flue of a thermal power plant, and prevent the flue gas at the chimney outlet from carrying liquid droplets out of the chimney and forming chimney rain.

[0007] This application discloses a device for collecting and discharging condensate from flue gas in a thermal power plant, comprising: multiple collection channels 1, a high-level collection tank 2, a low-level collection tank 3, and a discharge pipe 4;

[0008] The plurality of liquid collection channels 1 are arranged to fit the top, bottom and side walls of the horizontal flue S. The top liquid collection channel 1 is provided with the high-level collection box 2 on both sides, the bottom liquid collection channel 1 is provided with the low-level collection box 3 on both sides, the side wall liquid collection channel 1 is arranged in an inclined form to the horizontal plane, and the bottom of the side wall liquid collection channel 1 extends into the condensate collection box located at the bottom of the horizontal flue S.

[0009] The horizontal flue S is provided with a plurality of drain pipes 4 connected to the condensate collection box. The condensate flows into the condensate collection box from the collection channel 1 and is discharged through the drain pipes 4.

[0010] The opening of the liquid collection channel 1 faces the flue gas flow direction of the thermal power plant. The bottom surface of the liquid collection channel 1 is inclined upward and clamps with the vertical surface of the liquid collection channel 1 to form a condensate collection chamber for collecting the condensate.

[0011] In a preferred embodiment, the high-level collection box 2 includes: a high-level box body and a high-level baffle 5 disposed in the high-level box body. The upper end of the high-level baffle 5 is connected to the inner wall of the horizontal flue S. A gap is left between the lower end of the high-level baffle 5 and the bottom of the high-level box body to form a high-pressure zone 6. The cavities on both sides of the high-level baffle 5 are low-pressure zones 7.

[0012] In a preferred embodiment, the high-level housing has an opening at its far end, the top liquid collection channel 1 extends from the side wall of the high-level housing into the high-level housing, the bottom of the high-level housing slopes from the near end to the far end, the high-level housing is connected to the drain pipe 4 located on the side wall of the horizontal flue S, and the condensate in the top liquid collection channel 1 flows from the bottom of the sloped high-level housing into the drain pipe 4 and is discharged.

[0013] In a preferred embodiment, the low-level collection box 3 includes: a low-level box body and a low-level baffle 8 disposed in the low-level box body. The upper end of the low-level baffle 8 is connected to the top of the low-level box body, and a gap is left between the lower end of the low-level baffle 8 and the inner wall of the horizontal flue S to form a high-pressure zone 6. The cavities on both sides of the low-level baffle 8 are low-pressure zones 7.

[0014] In a preferred embodiment, the lower housing has an opening at its far end, the bottom liquid collection channel 1 extends into the lower housing from the side wall of the lower housing, the lower housing is connected to the drain pipe 4 located at the bottom of the horizontal flue S, and the condensate in the bottom liquid collection channel 1 flows from the lower housing into the drain pipe 4 and is discharged.

[0015] In a preferred embodiment, the condensate on the sidewall of the horizontal flue S is collected in the condensate receiving cavity by the sidewall liquid collection channel 1, and flows into the low-level box along the inclined direction of the sidewall liquid collection channel 1.

[0016] In a preferred embodiment, the top liquid collection channel 1 and the bottom liquid collection channel 1 are wedge-shaped with sharp corners, and the distance between the top liquid collection channel 1 and the bottom liquid collection channel 1 and the flue gas flow direction of the thermal power plant gradually increases from the center to both ends.

[0017] In a preferred embodiment, the angle between the sidewall liquid collection channel 1 and the horizontal plane is 70°.

[0018] In a preferred embodiment, the liquid collection channel 1 is provided with a reinforcing rib 9 inside, which is used to improve the rigidity of the liquid collection channel 1.

[0019] In a preferred embodiment, a plurality of the drain pipes 4 are interconnected to form a drain pipe network 4, and the output end of the drain pipe network 4 is connected to the wastewater treatment system of a thermal power plant.

[0020] This application also discloses a thermal power plant, comprising interconnected fuel system, steam cycle system, power generation system, flue gas treatment system, and a thermal power plant flue condensate collection and discharge device as described in any one of the above, as well as a wastewater treatment system; the wastewater treatment system is used for centralized treatment of the collected condensate.

[0021] In this embodiment, multiple liquid collection channels are provided at the top, bottom, and side walls to achieve comprehensive collection of condensate, preventing condensate from accumulating on the flue wall and causing corrosion. The side wall liquid collection channels are arranged at an angle and connected to a condensate collection tank at the bottom, which guides the condensate to converge along the direction of gravity, thereby ensuring efficient collection. The opening of the liquid collection channels faces the flue gas flow direction, allowing it to capture condensate in the direction of the airflow. The upward tilt of the bottom surface forms an angled collection chamber, preventing condensate from re-entering the main airflow due to airflow disturbance, significantly reducing the "chimney rain" phenomenon. The collection tank is connected to the drain pipe, further ensuring that the condensate can be discharged quickly, avoiding liquid accumulation. The overall structure of the device in this application can effectively overcome the problems of existing technologies in condensate collection and discharge.

[0022] Furthermore, the collection tank features a design that separates high-pressure and low-pressure zones. The pressure difference drives the condensate from the near-end low-pressure zone to the high-pressure zone, and then from the high-pressure zone to the far-end low-pressure zone, finally discharging it through the drain pipe. The high-pressure zone provides the power for the liquid flow, while the low-pressure zone guides the liquid to flow steadily, preventing backflow. This structure achieves efficient collection and rapid discharge of condensate through pressure difference, avoiding condensate stagnation in the system and preventing corrosion. Simultaneously, the high- and low-pressure separation design reduces the risk of turbulent flow disturbances, helps stabilize fluid behavior, and lowers the probability of droplets re-entering the airflow, thus effectively reducing the "chimney rain" phenomenon and improving the overall system's operating efficiency and stability.

[0023] Furthermore, the reinforcing ribs enhance the rigidity of the liquid collection channel, improving the overall structure's durability and stability, and preventing performance degradation due to deformation during long-term operation. In addition, the interconnected design of the drainage network makes condensate discharge smoother and connects to the wastewater treatment system, enabling centralized treatment and resource utilization of condensate, further improving the system's environmental performance and operational efficiency.

[0024] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these technical features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described invention, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which are considered to have been described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as described because it is technically infeasible, while the solution A+B+C+E should be considered as described. Attached Figure Description

[0025] Figure 1 This is a structural perspective view of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0026] Figure 2 This is a schematic AA cross-sectional view of a flue gas condensate collection and discharge device according to one embodiment of this application.

[0027] Figure 3This is a BB cross-sectional schematic diagram of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0028] Figure 4 This is a CC cross-sectional schematic diagram of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0029] Figure 5 This is a partial structural schematic diagram of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0030] Figure 6 This is a schematic diagram of the high-level collection box structure of a flue gas condensate collection and discharge device for thermal power plants according to one embodiment of this application.

[0031] Figure 7 This is a cross-sectional schematic diagram of the high-level collection box structure of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0032] Figure 8 This is a partial EE cross-sectional schematic diagram of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0033] Figure 9 This is a schematic diagram of the low-level collection box structure of a flue gas condensate collection and discharge device for thermal power plants according to one embodiment of this application.

[0034] Figure 10 This is a partial FF cross-sectional view of the low-level collection tank of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0035] Figure 11 This is a partial cross-sectional schematic diagram of a flue gas condensate collection and discharge device for a thermal power plant according to one embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Liquid collection channel, 2-High-level collection box, 3-Low-level collection box, 4-Drain pipe, 5-High-level baffle, 6-High-pressure zone, 7-Low-pressure zone, 8-Low-level baffle, 9-Reinforcing rib, S-Horizontal flue Detailed Implementation

[0038] In the following description, many technical details are presented to help the reader better understand this application. However, those skilled in the art will understand that the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0039] As used herein, the term "near end" refers to the starting point where flue gas enters the horizontal flue, i.e., the part closest to the flue gas discharge device (such as a desulfurization tower or other flue gas treatment equipment); the term "far end" refers to the ending point where flue gas exits the horizontal flue, i.e., the part closest to the chimney or other emission device.

[0040] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0041] The first embodiment of this application relates to a device for collecting and discharging condensate from the flue gas duct of a thermal power plant, the structural diagram of which is shown below. Figure 1 As shown, it includes: multiple liquid collection channels 1, a high-level collection tank 2, a low-level collection tank 3, and a drain pipe 4.

[0042] Multiple liquid collection channels 1 are installed along the top, bottom, and side walls of the horizontal flue S. The top liquid collection channel 1 has high-level collection boxes 2 on both sides, the bottom liquid collection channel 1 has low-level collection boxes 3 on both sides, and the side wall liquid collection channels 1 are arranged inclined to the horizontal plane. The bottom of the side wall liquid collection channels 1 extends into the condensate collection box located at the bottom of the horizontal flue S. Multiple drain pipes 4 are provided on the outside of the horizontal flue S, communicating with the condensate collection box. After condensate flows into the condensate collection box from the liquid collection channels 1, it is discharged through the drain pipes 4. The opening direction of the liquid collection channels 1 faces the flue gas flow direction of the thermal power plant. The bottom surface of the liquid collection channels 1 slopes upwards and clamps with the vertical surface of the liquid collection channels 1 to form a condensate collection chamber for collecting condensate.

[0043] In an optional embodiment, the high-level collection box 2 includes: a high-level box body and a high-level baffle 5 disposed in the high-level box body. The upper end of the high-level baffle 5 is connected to the inner wall of the horizontal flue S. A gap is left between the lower end of the high-level baffle 5 and the bottom of the high-level box body to form a high-pressure zone 6. The cavities on both sides of the high-level baffle 5 are low-pressure zones 7.

[0044] In an optional embodiment, the high-level box has an opening at its far end, and the top liquid collection channel 1 extends from the side wall of the high-level box into the high-level box. The bottom of the high-level box is inclined from the near end to the far end. The high-level box is connected to the drain pipe 4 located on the side wall of the horizontal flue S. The condensate in the top liquid collection channel 1 flows into the drain pipe 4 from the bottom of the inclined high-level box and is discharged.

[0045] In an optional embodiment, the low-level collection box 3 includes: a low-level box body and a low-level baffle 8 disposed in the low-level box body. The upper end of the low-level baffle 8 is connected to the top of the low-level box body, and a gap is left between the lower end of the low-level baffle 8 and the inner wall of the horizontal flue S to form a high-pressure zone 6. The cavities on both sides of the low-level baffle 8 are low-pressure zones 7.

[0046] In an optional embodiment, the lower housing has an opening at its far end, and the bottom liquid collection channel 1 extends into the lower housing from the side wall of the lower housing. The lower housing is connected to the drain pipe 4 located at the bottom of the horizontal flue S. The condensate in the bottom liquid collection channel 1 flows from the lower housing into the drain pipe 4 and is discharged.

[0047] In an optional embodiment, condensate on the sidewall of the horizontal flue S is collected in a condensate receiving cavity by the sidewall condensate collection channel 1, and flows into the lower-level collection box 3 along the inclined direction of the sidewall condensate collection channel 1. The inclination angle of the sidewall condensate collection channel 1 is designed according to the flue gas velocity and the flow characteristics of the condensate, preferably 70°, so as to utilize gravity to allow the condensate to flow smoothly into the lower-level collection box 3 located at the bottom of the horizontal flue S. The vertical surface of the sidewall condensate collection channel 1 is in close contact with the sidewall of the flue. A flow-reducing groove can be provided in the condensate receiving cavity to reduce the flow velocity when the condensate enters the receiving cavity and prevent the liquid from splashing out of the receiving cavity due to high-speed impact. The structure of the flow-reducing groove can be trapezoidal, wavy, or stepped from a microscopic point of view to adapt to different condensate flow characteristics. The trapezoidal flow-reducing groove reduces the flow velocity by expanding the liquid flow cross-section, the wavy flow-reducing groove extends the liquid path by using a curved surface design, and the stepped flow-reducing groove mitigates the liquid impact in stages through a multi-step structure.

[0048] In an optional embodiment, the top liquid collecting channel 1 and the bottom liquid collecting channel 1 are wedge-shaped with sharp corners, and the distance between the top liquid collecting channel 1 and the flue gas flow direction of the thermal power plant gradually increases from the center to both ends. The wedge shape of the top liquid collecting channel 1 allows droplets condensed from the flue gas to quickly gather in the channel, preventing the droplets from spreading in the channel or being carried back into the gas flow due to turbulence. The sharp corners can guide the condensate to flow to both ends of the liquid collecting channel 1 through airflow dynamics, thereby preventing liquid stagnation.

[0049] In an optional embodiment, a reinforcing rib 9 is provided inside the liquid collection channel 1 to improve the rigidity of the liquid collection channel 1. The reinforcing rib 9 in this application is vertically connected inside the liquid collection channel 1, with one side having an inclined angle and the other side fixed to the inner wall of the horizontal flue S or the bottom of the liquid collection channel 1.

[0050] In an optional embodiment, multiple drain pipes 4 are interconnected to form a drain pipe network 4, the output end of which is connected to the wastewater treatment system of the thermal power plant. The drain pipe network 4 can consist of branch pipes, a main drain pipe 4, and connecting nodes. The branch pipes are connected to various condensate collection tanks or low-level tanks, and converge at the connecting nodes to the main drain pipe 4, ultimately transporting the condensate to the wastewater treatment system. The connecting nodes of the drain pipe network 4 can be modularly designed, equipped with check valves and dynamic flow control devices to prevent condensate backflow and cross-contamination. The output end of the drain pipe network 4 is connected to the wastewater treatment system of the thermal power plant via a pipeline. The wastewater treatment system can centrally treat impurities, particulate matter, and acidic components in the condensate, ensuring that wastewater discharge meets environmental protection requirements. The interface between the pipe network and the wastewater treatment system can be equipped with a filter device and leak-proof connection components.

[0051] To better understand the technical solution of this application, a specific example is provided below. The details listed in this example are mainly for ease of understanding and are not intended to limit the scope of protection of this application.

[0052] This invention discloses a condensate collection and discharge device for flue gas in thermal power plants. The device includes multiple collection channels 1, a high-level collection tank 2, a low-level collection tank 3, and multiple discharge pipes 4. Through structural arrangement and fluid optimization design, this device can efficiently collect condensate in the horizontal flue gas duct S and discharge the condensate through a network of interconnected discharge pipes 4, solving the problems of condensate retention and "chimney rain" in the prior art.

[0053] The liquid collection channels 1 are arranged to conform to the top, bottom, and side walls of the horizontal flue S. The top and bottom liquid collection channels 1 are wedge-shaped, with their distance from the flue gas flow direction gradually increasing from the center to both ends; the side wall liquid collection channels 1 are arranged inclined to the horizontal plane, with an inclination angle preferably of 70°. The cross-section of the liquid collection channels 1 and 1 is L-shaped, with the L-shaped opening facing the flue gas flow direction. This allows for efficient capture of entrained condensate using the kinetic energy of the flue gas, pushing it from the apex of the wedge-shaped channels to both ends of the top and bottom liquid collection channels 1, where it flows into the collection box. The condensate on the flue side wall flows downward through the inclined liquid collection channels 1 and finally enters the low-level collection box 3.

[0054] The high-level collection box 2 includes a high-level box body and a high-level baffle 5 disposed therein. The upper end of the high-level baffle 5 is connected to the inner wall of the horizontal flue S, and a gap is left between the lower end and the bottom of the high-level box body to form a high-pressure zone 6. The cavities on both sides of the high-level baffle 5 are low-pressure zones 7. A rectangular opening is provided at the upper part of the far end of the high-level box body to create a high-low pressure difference inside the high-level box body. This high-low pressure zone 7 design is used to release the condensate in a secondary manner, ensuring that the condensate can smoothly enter the drain pipe 4. The bottom of the high-level box body slopes from the near end to the far end. The top liquid collection channel 1 extends from the side wall of the high-level box body into the high-level box body. The condensate gathers along the sloping bottom and is discharged from the near end to the far end through the connection between the high-level box body and the drain pipe 4.

[0055] The low-level collection box 3 similarly includes a low-level box body and a low-level baffle 8. The upper end of the low-level baffle 8 is connected to the top of the low-level box body, and a gap is left between the lower end and the inner wall of the horizontal flue S, forming a high-pressure zone 6. The cavities on both sides of the low-level baffle 8 are low-pressure zones 7. By utilizing the change between high and low pressure, the condensate is ensured to be released in the low-level box body and flow to the drain pipe 4. A rectangular opening is provided at the upper part of the far end of the low-level box body to generate a high-low pressure difference inside the low-level box body. The bottom liquid collection channel 1 extends into the low-level box body from the side wall. The condensate flows through the low-level box body into the drain pipe 4 located at the bottom and is connected to it and finally discharged. The opening direction of the bottom drain pipe 4 is preferably downward.

[0056] The drain pipes 4 of all high-level and low-level collection tanks 3 are interconnected to form a complete drain pipe network 4. The output end of the drain pipe network 4 is connected to the wastewater treatment system of the thermal power plant for centralized treatment of impurities and acidic components in the condensate, ensuring that wastewater discharge meets environmental protection requirements. The modular design of the drain pipe network 4 can adapt to different condensate flow rates and operating conditions, further improving the system's operating efficiency.

[0057] This device allows for the efficient collection and guidance of condensate from the top, bottom, and side walls to their respective collection tanks. The sharp angle design of the L-shaped collection channel 1 and the placement of high and low pressure zones 7 ensure rapid discharge of condensate without secondary re-entrainment by flue gas, significantly reducing the risk of "chimney rain." This invention is particularly suitable for the high humidity and high flow rate flue gas environment in thermal power plants and has significant industrial application value.

[0058] The second embodiment of this application relates to a thermal power plant, comprising interconnected components: a fuel system, a steam cycle system, a power generation system, a flue gas treatment system, and a flue gas condensate collection and discharge device for thermal power plant flue gas as described above, as well as a wastewater treatment system; the wastewater treatment system is used for centralized treatment of the collected condensate.

[0059] The second embodiment is a product implementation that includes the first embodiment. The technical details, structural features, and functional characteristics disclosed in the first embodiment can be applied completely or partially to the second embodiment to achieve the same or complementary technical effects as those described in the first embodiment. Based on the first embodiment, the second embodiment further improves the scope of application and implementation path of the overall technical solution.

[0060] It should be noted that in this patent application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one" does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. In this patent application, if it refers to performing an action according to an element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

[0061] All documents mentioned in this application are considered to be incorporated in their entirety into the disclosure of this application so that they can serve as a basis for modifications if necessary. Furthermore, it should be understood that after reading the foregoing disclosure of this application, those skilled in the art can make various alterations or modifications to this application, and these equivalent forms also fall within the scope of protection claimed in this application.

Claims

1. A device for collecting and discharging condensate from flue gas in a thermal power plant, characterized in that, include: Multiple liquid collection channels (1), a high-level collection tank (2), a low-level collection tank (3), and a drain pipe (4); The plurality of liquid collection channels (1) are fitted to the top, bottom and side walls of the horizontal flue (S). The top liquid collection channel (1) is provided with the high-level collection box (2) on both sides, the bottom liquid collection channel (1) is provided with the low-level collection box (3) on both sides, and the side wall liquid collection channel (1) is arranged in an inclined manner to the horizontal plane. The bottom of the side wall liquid collection channel (1) extends into the condensate collection box located at the bottom of the horizontal flue (S). The horizontal flue (S) is provided with a plurality of drain pipes (4) connected to the condensate collection box. The condensate flows into the condensate collection box from the liquid collection channel (1) and is discharged through the drain pipes (4). The opening direction of the liquid collection channel (1) is directly facing the flue gas flow direction of the thermal power plant. The bottom surface of the liquid collection channel (1) is inclined upward and clamps the vertical surface of the liquid collection channel (1) to form a condensate collection cavity for collecting the condensate.

2. The flue gas condensate collection and discharge device for thermal power plants as described in claim 1, characterized in that, The high-level collection box (2) includes: a high-level box body and a high-level baffle disposed in the high-level box body. The upper end of the high-level baffle (5) is connected to the inner wall of the horizontal flue (S). A gap is left between the lower end of the high-level baffle (5) and the bottom of the high-level box body to form a high-pressure zone (6). The cavities on both sides of the high-level baffle (5) are low-pressure zones (7).

3. The flue gas condensate collection and discharge device for thermal power plants as described in claim 2, characterized in that, The high-level box has an opening at its far end. The top liquid collection channel (1) extends from the side wall of the high-level box into the high-level box. The bottom of the high-level box is inclined from the near end to the far end. The high-level box is connected to the drain pipe (4) located on the side wall of the horizontal flue (S). The condensate in the top liquid collection channel (1) flows from the inclined bottom of the high-level box into the drain pipe (4) and is discharged.

4. The flue gas condensate collection and discharge device for thermal power plants as described in claim 1, characterized in that, The low-level collection box (3) includes: a low-level box body and a low-level baffle disposed in the low-level box body. The upper end of the low-level baffle (8) is connected to the top of the low-level box body. A gap is left between the lower end of the low-level baffle (8) and the inner wall of the horizontal flue (S) to form a high-pressure zone (6). The cavities on both sides of the low-level baffle (8) are low-pressure zones (7).

5. The flue gas condensate collection and discharge device for thermal power plants as described in claim 4, characterized in that, The lower housing has an opening at its far end. The bottom liquid collection channel (1) extends into the lower housing from the side wall of the lower housing. The lower housing is connected to the drain pipe (4) located at the bottom of the horizontal flue (S). The condensate in the bottom liquid collection channel (1) flows from the lower housing into the drain pipe (4) and is discharged.

6. The flue gas condensate collection and discharge device for thermal power plants as described in claim 4, characterized in that, The condensate on the side wall of the horizontal flue (S) is collected in the condensate receiving cavity by the side wall liquid collection channel (1) and flows into the low-level box along the inclined direction of the side wall liquid collection channel (1).

7. The flue gas condensate collection and discharge device for thermal power plants as described in claim 1, characterized in that, The top liquid collection channel (1) and the bottom liquid collection channel (1) are wedge-shaped with sharp corners. The distance between the top liquid collection channel (1) and the bottom liquid collection channel (1) and the flue gas flow direction of the thermal power plant gradually increases from the center to both ends.

8. The flue gas condensate collection and discharge device for thermal power plants as described in claim 1, characterized in that, The liquid collection channel (1) is provided with a reinforcing rib (9) inside, which is used to improve the rigidity of the liquid collection channel (1).

9. The flue gas condensate collection and discharge device for thermal power plants as described in claim 1, characterized in that, Multiple drainage pipes (4) are interconnected to form a drainage pipe (4) network, and the output end of the drainage pipe (4) network is connected to the wastewater treatment system of the thermal power plant.

10. A thermal power plant, characterized in that, It includes interconnected systems: a fuel system, a steam cycle system, a power generation system, a flue gas treatment system, and a condensate collection and discharge device for flue gas from a thermal power plant as described in any one of claims 1-9, as well as a wastewater treatment system; the wastewater treatment system is used for centralized treatment of the collected condensate.

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