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

Abstract

The invention 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 efficiently collect condensate in the flowing direction of the condensate on the inner wall of a flue of the thermal power plant and prevent chimney rain formed by discharging chimney outlet smoke carrying liquid drops out of a chimney. The device comprises a plurality of liquid collecting runners, a high-position collecting box, a low-position collecting box and a liquid discharging pipe. The plurality of liquid collection flow channels are attached to the top, the bottom and the side wall of the horizontal flue, high-position collection boxes are arranged on the two sides of the top liquid collection flow channel, low-position collection boxes are arranged on the two sides of the bottom liquid collection flow channel, and the side wall liquid collection flow channels are arranged in a mode of inclining to the horizontal plane. And the bottom of the side wall liquid collecting flow channel extends into a condensate collecting box located at the bottom of the horizontal flue. A plurality of liquid discharging pipes communicated with the condensate collecting box are 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 discharging pipes. 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] The present application relates to the field of thermal power generation, and in particular to a thermal power plant and a device for collecting and discharging flue condensate from the thermal power plant. Background Art

[0002] With the increasing demand for environmental protection and energy saving and efficiency improvement, thermal power plants generally adopt wet flue gas desulfurization process, and no longer configure GGH (flue gas-flue gas reheater). Under this condition, the flue gas temperature is low, and serious condensation is likely to occur in the chimney. The flue gas discharged by the wet flue gas desulfurization process contains a large amount of saturated water vapor. When the ambient temperature is low, these water vapors will condense into droplets on the inner wall of the chimney, resulting in the accumulation of condensate. This condensate is often accompanied by gypsum droplets produced by wet flue gas desulfurization and adheres to the inner wall of the chimney, making the inner wall of the chimney susceptible to corrosion.

[0003] In addition, the condensate forms a liquid film on the inner wall of the chimney, and the airflow inside the smoke exhaust pipe is uneven, with a large number of turbulent areas, and the local airflow velocity may be high, causing the droplets to enter the airflow again. When the flue gas velocity is high, the droplets will be discharged from the chimney along with the flue gas, forming a "chimney rain" phenomenon at the outlet, polluting the environment and increasing the risk of corrosion of surrounding equipment and buildings.

[0004] The current condensate collection system usually includes a bidirectional inclined liquid collection ring on the inner wall of the chimney, multiple high and low collection ports and a condensate discharge pipe, which is designed to collect the condensate and guide it to the discharge port. However, this system has design limitations. The T-shaped profile of the collection ring is arranged along the annular tilt, but due to factors such as turbulent airflow on the inner wall of the chimney and uneven airflow velocity, the condensate is often not effectively collected. Especially in the case of uneven wall surface or discontinuous airflow, droplets are easily brought into the airflow for a second time, thereby exacerbating the formation of chimney rain.

[0005] In summary, the existing technology has deficiencies in the comprehensive collection and discharge of condensate, which makes it difficult to effectively solve the risk of condensate corrosiveness to the inner wall of the chimney and the chimney rain problem. Summary of the invention

[0006] The purpose of the present application is to provide a thermal power plant and a device for collecting and discharging condensate from the flue of the thermal power plant, which can efficiently collect condensate in accordance with the flow direction of condensate on the inner wall of the flue of the thermal power plant, and avoid the chimney outlet flue gas carrying droplets to be discharged from the chimney to form chimney rain.

[0007] The present application discloses a device for collecting and discharging flue condensate in a thermal power plant, comprising: a plurality of liquid collecting flow channels 1, a high-position collecting box 2, a low-position collecting box 3, and a liquid discharge pipe 4;

[0008] The multiple liquid collecting flow channels 1 are arranged in contact with the top, bottom and side walls of the horizontal flue S, wherein the high-position collecting boxes 2 are arranged on both sides of the top liquid collecting flow channel 1, the low-position collecting boxes 3 are arranged on both sides of the bottom liquid collecting flow channel 1, and the side wall liquid collecting flow channel 1 is arranged in a form inclined to the horizontal plane, and the bottom of the side wall liquid collecting flow channel 1 extends into the condensate collecting box located at the bottom of the horizontal flue S;

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

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

[0011] In a preferred example, the high-position collecting box 2 includes: a high-position box body and a high-position baffle 5 arranged in the high-position box body, the upper end of the high-position baffle 5 is connected to the inner wall of the horizontal flue S, and a gap is left between the lower end of the high-position baffle 5 and the bottom of the high-position box body to form a high-pressure area 6, and the cavities on both sides of the high-position baffle 5 are low-pressure areas 7.

[0012] In a preferred example, an opening is provided at the distal end of the high-level box, and the top liquid collecting channel 1 extends from the side wall of the high-level box into the high-level box, and the bottom of the high-level box is inclined from the proximal end to the distal end, and the high-level box is connected to the drain pipe 4 located on the side wall of the horizontal flue S, and the condensate in the top liquid collecting channel 1 flows into the drain pipe 4 from the inclined bottom of the high-level box and is discharged.

[0013] In a preferred example, the low-level collection box 3 includes: a low-level box body and a low-level baffle 8 arranged 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 area 6, and the cavities on both sides of the low-level baffle 8 are low-pressure areas 7.

[0014] In a preferred example, an opening is provided at the far end of the low-level box, and the bottom liquid collecting channel 1 extends into the low-level box from the side wall of the low-level box. The low-level box is connected to the drain pipe 4 located at the bottom of the horizontal flue S, and the condensate in the bottom liquid collecting channel 1 flows from the low-level box into the drain pipe 4 and is discharged.

[0015] In a preferred example, the condensate on the side wall of the horizontal flue S is collected in the condensate containing chamber by the side wall liquid collecting channel 1 and flows into the low-position box along the inclined direction of the side wall liquid collecting channel 1 .

[0016] In a preferred example, 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 bottom liquid collecting 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 example, the angle between the side wall liquid collecting channel 1 and the horizontal plane is 70°.

[0018] In a preferred example, a reinforcing rib plate 9 is provided inside the liquid collecting channel 1 , and the reinforcing rib plate 9 is used to improve the rigidity of the liquid collecting channel 1 .

[0019] In a preferred example, a plurality of the 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 a wastewater treatment system of a thermal power plant.

[0020] The present application also discloses a thermal power plant, comprising: a fuel system, a steam circulation system, a power generation system, a flue gas treatment system, and a thermal power plant flue condensate collection and discharge device as described in any one of the above, and a wastewater treatment system; the wastewater treatment system is used to centrally treat the collected condensate.

[0021] In the implementation mode of the present application, a plurality of liquid collecting flow channels are arranged on the top, bottom and side walls to realize comprehensive collection of condensate, thereby preventing condensate from being retained on the flue wall and causing corrosion problems. The side wall liquid collecting flow channels are arranged at an inclination, and the bottom is connected to a condensate collection box, which can guide the condensate to gather along the direction of gravity, thereby ensuring efficient collection of condensate. The opening direction of the liquid collecting flow channel is opposite to the flue gas flow direction, and the condensate can be captured in the direction of the airflow. The bottom surface is tilted upward to form an angled collection cavity, which can prevent the condensate from re-entering the main airflow due to airflow disturbance, significantly reducing the "chimney rain" phenomenon. The collection box is connected to the drain pipe, which further ensures that the condensate can be discharged quickly to avoid liquid accumulation problems. The comprehensive structure of the device of the present application can effectively overcome the problems of the prior art in condensate collection and discharge.

[0022] Furthermore, the interior of the collection box is designed to be separated by a high-pressure area and a low-pressure area, and the pressure difference is used to push the condensate to flow steadily from the low-pressure area at the proximal end to the high-pressure area, and then flow from the high-pressure area to the low-pressure area at the distal end and finally be discharged through the drain pipe. The high-pressure area provides power for the liquid flow, and the low-pressure area guides the liquid to be discharged steadily to prevent the occurrence of backflow. This structure achieves efficient collection and rapid discharge of condensate through pressure difference, avoiding condensate from being retained in the system and causing corrosion. At the same time, the high- and low-pressure separation design reduces the risk of liquid being disturbed by turbulence, helps to stabilize fluid behavior, and reduces the probability of droplets entering the airflow for the second time, thereby effectively reducing the "chimney rain" phenomenon and improving the operating efficiency and stability of the entire system.

[0023] Furthermore, the reinforcing ribs enhance the rigidity of the liquid collecting channel, improve the durability and stability of the overall structure, and avoid affecting performance due to deformation during long-term operation. In addition, the interconnected design of the drainage pipe network makes the discharge of condensate smoother and is connected to the wastewater treatment system, realizing the centralized treatment and resource utilization of condensate, further improving the environmental performance and operation efficiency of the system.

[0024] A large number of technical features are recorded in the specification of this application, which are distributed in various technical solutions. If all possible combinations of technical features of this application (i.e., technical solutions) are to be listed, the specification will be too long. In order to avoid this problem, the various technical features disclosed in the above-mentioned invention content of this application, the various technical features disclosed in the various embodiments and examples below, and the various technical features disclosed in the accompanying drawings can be freely combined with each other to form various new technical solutions (these technical solutions are all deemed to have been recorded in this specification), unless the combination of such technical features is technically infeasible. For example, in one example, feature A+B+C is disclosed, and in another example, feature A+B+D+E is disclosed, and features C and D are equivalent technical means that play the same role. Technically, only one can be used, and it is impossible to use them at the same time. Feature E can be combined with feature C technically. Then, the solution of A+B+C+D should not be deemed to have been recorded because it is technically infeasible, and the solution of A+B+C+E should be deemed to have been recorded. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic structural perspective view of a device for collecting and discharging flue condensate in a thermal power plant according to one embodiment of the present application.

[0026] Figure 2 It is a schematic AA cross-sectional view of a flue condensate collection and discharge device for a thermal power plant according to one embodiment of the present application.

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

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

[0029] Figure 5 It is a schematic diagram of the partial structure of a flue condensate collection and discharge device for a thermal power plant according to one embodiment of the present application.

[0030] Figure 6 It is a schematic diagram of the structure of a high-level collection box of a flue condensate collection and discharge device in a thermal power plant according to an embodiment of the present application.

[0031] Figure 7 It is a schematic cross-sectional view of a high-level collection box structure DD of a flue condensate collection and discharge device for a thermal power plant according to an embodiment of the present application.

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

[0033] Fig. 9 It is a schematic diagram of the structure of a low-level collection box of a flue condensate collection and discharge device in a thermal power plant according to an embodiment of the present application.

[0034] Fig.10 It is a partial FF cross-sectional schematic diagram of a low-level collection box of a flue condensate collection and discharge device for a thermal power plant according to an embodiment of the present application.

[0035] Fig.11 It is a partial GG cross-sectional schematic diagram of a flue condensate collection and discharge device for a thermal power plant according to one embodiment of the present application.

[0036] Description of reference numerals:

[0037] 1-liquid collecting channel, 2-high-position collecting box, 3-low-position collecting box, 4-liquid discharge pipe, 5-high-position baffle, 6-high-pressure area, 7-low-pressure area, 8-low-position baffle, 9-reinforced rib plate, S-horizontal flue DETAILED DESCRIPTION

[0038] In the following description, many technical details are provided to help readers better understand the present application. However, those skilled in the art can understand that the technical solution claimed in the present application can be implemented even without these technical details and various changes and modifications based on the following embodiments.

[0039] As used herein, the term "proximal end" refers to the starting position where the flue gas enters the horizontal flue, that is, the position close to the flue gas exhaust device (such as a desulfurization tower or other flue gas treatment equipment); the term "distal end" refers to the end position where the flue gas is discharged from the horizontal flue, that is, the position close to the chimney or other emission devices.

[0040] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0041] The first embodiment of the present application relates to a device for collecting and discharging flue condensate in a thermal power plant, and its structure diagram is as follows: Figure 1 As shown, it includes: a plurality of liquid collecting channels 1, a high-position collecting box 2, a low-position collecting box 3, and a liquid drain pipe 4.

[0042] A plurality of liquid collecting channels 1 are arranged to fit the top, bottom and side walls of the horizontal flue S, wherein high-position collecting boxes 2 are arranged on both sides of the top liquid collecting channel 1, low-position collecting boxes 3 are arranged on both sides of the bottom liquid collecting channel 1, and the side wall liquid collecting channel 1 is arranged in a form inclined to the horizontal plane, and the bottom of the side wall liquid collecting channel 1 extends into the condensate collecting box located at the bottom of the horizontal flue S. A plurality of drain pipes 4 connected to the condensate collecting box are arranged on the outside of the horizontal flue S, and the condensate flows into the condensate collecting box from the liquid collecting channel 1 and is discharged through the drain pipe 4. The opening direction of the liquid collecting channel 1 faces the flue gas flow direction of the thermal power plant, and the bottom surface of the liquid collecting channel 1 is inclined upward and clamped with the vertical surface of the liquid collecting channel 1 to form a condensate collecting chamber for collecting condensate.

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

[0044] In an optional embodiment, an opening is provided at the distal end of the high-level box, and the top liquid collecting 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 proximal end to the distal 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 collecting 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 arranged 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 area 6, and the cavities on both sides of the low-level baffle 8 are low-pressure areas 7.

[0046] In an optional embodiment, an opening is provided at the far end of the low-level box, and the bottom liquid collecting channel 1 extends into the low-level box from the side wall of the low-level box. The low-level box is connected to the drain pipe 4 located at the bottom of the horizontal flue S, and the condensate in the bottom liquid collecting channel 1 flows from the low-level box into the drain pipe 4 and is discharged.

[0047] In an optional embodiment, the condensate on the side wall of the horizontal flue S is collected in the condensate receiving chamber by the side wall liquid collecting flow channel 1, and flows into the low-level box along the inclined direction of the side wall liquid collecting flow channel 1. The inclination angle of the side wall liquid collecting flow channel 1 is designed according to the flue gas flow rate and the flow characteristics of the condensate, preferably 70°, so that the condensate can flow smoothly into the low-level collection box 3 at the bottom of the horizontal flue S by gravity, and the vertical surface of the side wall liquid collecting flow channel 1 is closely fitted with the flue side wall. A slow flow groove can be provided in the condensate receiving chamber to reduce the flow rate when the condensate enters the receiving chamber to prevent the liquid from splashing out of the receiving chamber due to high-speed impact. The structure of the slow flow groove can be trapezoidal, wavy or graded from a microscopic perspective to adapt to different condensate flow characteristics. The trapezoidal slow flow groove reduces the flow rate by expanding the liquid flow cross section, the wavy slow flow groove uses a curved surface design to extend the liquid path, and the graded slow flow groove alleviates the liquid impact in stages through a multi-step structure.

[0048] In an optional embodiment, the top liquid collecting flow channel 1 and the bottom liquid collecting flow channel 1 are wedge-shaped with sharp corners, and the distance between the top liquid collecting flow channel 1 and the bottom liquid collecting flow 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 flow channel 1 allows the droplets condensed from the flue gas to quickly gather in the flow channel, preventing the droplets from diffusing in the flow channel or being brought back into the airflow due to turbulence, and the sharp corners can guide the condensate to flow to both ends of the liquid collecting flow channel 1 through the action of airflow dynamics, thereby preventing liquid retention.

[0049] In an optional embodiment, a reinforcing rib plate 9 is provided inside the liquid collecting channel 1, and the reinforcing rib plate 9 is used to improve the rigidity of the liquid collecting channel 1. The reinforcing rib plate 9 in the present application is vertically connected inside the liquid collecting channel 1, one side of which has an inclined angle, and the other side is fixed to the inner side of the cylinder wall of the horizontal flue S or the bottom of the liquid collecting channel 1.

[0050] In an optional embodiment, a plurality of drain pipes 4 are interconnected to form a drain pipe 4 network, and the output end of the drain pipe 4 network is connected to the wastewater treatment system of the thermal power plant. The drain pipe 4 network can be composed of branch pipes, a main drain pipe 4 and a connecting node. The branch pipes are respectively connected to each condensate collection box or a low-level box, and are collected to the main drain pipe 4 through the connecting node, and finally the condensate is transported to the wastewater treatment system. The connecting node of the drain pipe 4 network can be modularly designed, equipped with a one-way valve and a dynamic flow control device to prevent condensate backflow and cross contamination. The output end of the drain pipe 4 network is connected to the wastewater treatment system of the thermal power plant through a pipeline. The wastewater treatment system can centrally treat impurities, particulate matter and acidic components in the condensate to ensure that the wastewater discharge meets environmental protection requirements. The interface between the pipe network and the wastewater treatment system can be equipped with a filtering device and a leak-proof connection component.

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

[0052] The present invention discloses a device for collecting and discharging flue condensate in a thermal power plant, the device comprising a plurality of liquid collecting channels 1, a high-position collecting box 2, a low-position collecting box 3 and a plurality of liquid discharge pipes 4. Through structural arrangement and fluid optimization design, the device can efficiently collect condensate in a horizontal flue S, and discharge the condensate through a network of connected liquid discharge pipes 4, thereby solving the problems of condensate retention and "chimney rain" in the prior art.

[0053] The liquid collecting channel 1 is arranged to fit the top, bottom and side wall of the horizontal flue S. The top and bottom liquid collecting channels 1 are wedge-shaped, and their distance from the flue gas flow direction gradually increases from the center to both ends; the liquid collecting channel 1 on the side wall is arranged in a form inclined to the horizontal plane, and the inclination angle is preferably 70°. The cross-sections of the liquid collecting channel 1 and the liquid collecting channel 1 are L-shaped, and the L-shaped opening direction faces the flue gas flow direction. The kinetic energy of the flue gas can be used to efficiently capture the entrained condensate, and push it from the sharp corners of the wedge-shaped channel to the two ends of the top liquid collecting channel 1 and the bottom liquid collecting channel 1, and merge into the collection box. The condensate on the side wall of the flue flows downward through the inclined liquid collecting channel 1 and finally enters the low-level collection box 3.

[0054] The high-position collecting box 2 includes a high-position box body and a high-position baffle 5 disposed therein. The upper end of the high-position 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-position box body to form a high-pressure area 6; the cavities on both sides of the high-position baffle 5 are low-pressure areas 7, and a rectangular opening is provided at the upper distal end of the high-position box body to generate a high-low pressure difference inside the high-position box body. The design of this high-low pressure area 7 is used to release the condensate for a second time to ensure that the condensate can smoothly enter the drain pipe 4. The bottom of the high-position box body is inclined from the proximal end to the distal end, and the top liquid collecting channel 1 extends from the side wall of the high-position box body into the high-position box body. The condensate is gathered along the inclined bottom and discharged from the proximal end to the distal end through the connection between the high-position 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 to form a high-pressure area 6; the cavities on both sides of the low-level baffle 8 are low-pressure areas 7, and the changes in high and low pressures are used to ensure that the condensate is released in the low-level box body and flows to the drain pipe 4. A rectangular opening is provided at the upper far end of the low-level box body to generate a high and low pressure difference inside the low-level box body. The bottom liquid collection channel 1 extends from the side wall of the low-level box body into the low-level box body. The condensate flows through the low-level box body into the drain pipe 4 at the bottom connected thereto and is finally discharged. The opening direction of the drain pipe 4 at the bottom is preferably downward.

[0056] The drainage pipes 4 of all high-level and low-level collection boxes 3 are interconnected to form a complete drainage pipe 4 network. The output end of the drainage pipe 4 network is connected to the wastewater treatment system of the thermal power plant to centrally treat impurities and acidic components in the condensate to ensure that the wastewater discharge meets environmental protection requirements. The modular design of the drainage pipe 4 network can adapt to different condensate flows and operating conditions, further improving the operating efficiency of the system.

[0057] Through this device, the condensate on the top, bottom and side walls can be efficiently collected and guided to the corresponding collection boxes respectively. The sharp angle design of the L-shaped liquid collection channel 1 and the setting of the high and low pressure areas 7 ensure that the condensate can be discharged quickly without being carried out by the flue gas for a second time, which significantly reduces the risk of "chimney rain". The present invention is particularly suitable for high humidity and high flow rate flue gas environments in thermal power plants and has important industrial application value.

[0058] The second embodiment of the present application relates to a thermal power plant, comprising: a fuel system, a steam circulation system, a power generation system, a flue gas treatment system, and a thermal power plant flue condensate collection and discharge device as described above, and a wastewater treatment system, which are interconnected; the wastewater treatment system is used to centrally treat the collected condensate.

[0059] The second embodiment is a product embodiment that includes the first embodiment, wherein the technical details, structural features, and functional characteristics disclosed in the first embodiment can be fully or partially applied to the second embodiment to achieve the goal of being consistent with or complementary to the technical effects described in the first embodiment. The second embodiment further improves the scope of application and implementation path of the overall technical solution based on the first embodiment.

[0060] It should be noted that in the application documents of this patent, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one" do not exclude the existence of other identical elements in the process, method, article or device including the elements. In the application documents of this patent, if it is mentioned that an action is performed according to an element, it means that the action is performed at least according to the element, which includes two situations: performing the action only according to the element, and performing the action according to the element and other elements. Expressions such as multiple, multiple, and multiple include 2, 2 times, 2 kinds, and more than 2, more than 2 times, and more than 2 kinds.

[0061] All documents mentioned in this application are considered to be included in the disclosure of this application as a whole, so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure of this application, those skilled in the art can make various changes 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 flue condensate in a thermal power plant, characterized in that: include: A plurality of liquid collecting channels (1), a high-position collecting box (2), a low-position collecting box (3), and a liquid drain pipe (4); The plurality of liquid collecting flow channels (1) are arranged in contact with the top, bottom and side walls of the horizontal flue (S), wherein the high-position collecting boxes (2) are arranged on both sides of the top liquid collecting flow channel (1), and the low-position collecting boxes (3) are arranged on both sides of the bottom liquid collecting flow channel (1), and the side wall liquid collecting flow channel (1) is arranged in a form inclined to a horizontal plane, and the bottom of the side wall liquid collecting flow channel (1) extends into a condensate collecting box located at the bottom of the horizontal flue (S); The outside of the horizontal flue (S) is provided with a plurality of drain pipes (4) connected to the condensate collection box. After the condensate flows from the liquid collecting channel (1) into the condensate collection box, it is discharged through the drain pipes (4); the opening direction of the liquid collecting channel (1) faces the flue gas flow direction of the thermal power plant, and the bottom surface of the liquid collecting channel (1) is inclined upward and clamped with the vertical surface of the liquid collecting channel (1) to form a condensate collection chamber for collecting the condensate.

2. The device for collecting and discharging flue condensate of a thermal power plant according to claim 1, characterized in that: The high-position collecting box (2) comprises: a high-position box body and a high-position baffle plate arranged in the high-position box body, the upper end of the high-position baffle plate (5) is connected to the inner wall of the horizontal flue (S), a gap is left between the lower end of the high-position baffle plate (5) and the bottom of the high-position box body to form a high-pressure area (6), and the cavities on both sides of the high-position baffle plate (5) are low-pressure areas (7).

3. The device for collecting and discharging flue condensate of a thermal power plant according to claim 2, characterized in that: The far end of the high-position box is provided with an opening, and the top liquid collecting flow channel (1) extends from the side wall of the high-position box into the high-position box. The bottom of the high-position box is inclined from the proximal end to the distal end. The high-position box is connected to a drain pipe (4) located on the side wall of the horizontal flue (S). Condensate in the top liquid collecting flow channel (1) flows into the drain pipe (4) from the inclined bottom of the high-position box and is discharged.

4. The device for collecting and discharging flue condensate of a thermal power plant according to claim 1, characterized in that: The low-level collecting box (3) comprises: a low-level box body and a low-level baffle plate arranged in the low-level box body, the upper end of the low-level baffle plate (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 plate (8) and the inner wall of the horizontal flue (S) to form a high-pressure area (6), and the cavities on both sides of the low-level baffle plate (8) are low-pressure areas (7).

5. The device for collecting and discharging flue condensate of a thermal power plant according to claim 4, characterized in that: An opening is provided at the far end of the low-level box, and the bottom liquid collecting channel (1) extends into the low-level box from the side wall of the low-level box. The low-level box is connected to a drain pipe (4) located at the bottom of the horizontal flue (S), and the condensate in the bottom liquid collecting channel (1) flows from the low-level box into the drain pipe (4) and is discharged.

6. The device for collecting and discharging flue condensate of a thermal power plant according to claim 1, characterized in that: The condensate on the side wall of the horizontal flue (S) is collected in the condensate containing chamber by the side wall liquid collecting channel (1), and flows into the low-position box along the inclined direction of the side wall liquid collecting channel (1).

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

8. The device for collecting and discharging flue condensate of a thermal power plant according to claim 1, characterized in that: A reinforcing rib plate (9) is provided inside the liquid collecting channel (1), and the reinforcing rib plate (9) is used to increase the rigidity of the liquid collecting channel (1).

9. The device for collecting and discharging flue condensate of a thermal power plant according to claim 1, characterized in that: A plurality of the 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 a wastewater treatment system of a thermal power plant.

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

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