Drainage heat recovery device for steam turbine of power plant

Abstract

The utility model discloses a power plant steam turbine drainage heat recovery device, and relates to the technical field of steam turbine drainage heat recovery. The device comprises a recycling box, an annular bottom shell is fixedly connected to the bottom of the recycling box, a plurality of air inlet pipes are fixedly connected to the bottom of the annular bottom shell, the device further comprises a filtering mechanism, the filtering mechanism is arranged on the top of the recycling box, and the filtering mechanism comprises two filtering boxes fixedly connected to the top of the recycling box. According to the utility model, the filtering mechanism is arranged, specifically, after waste heat of waste gas is utilized, the waste gas enters the filtering box through the flowing port, the ceramic-based composite material in the ceramic-based composite material placing box can filter and intercept the waste gas for the first time, and then the waste gas is finely filtered through the double-layer high-molecular polymer filter element; by means of the mode, finer filtration can be achieved, good adsorption and purification effects are achieved, finally filtered waste gas is exhausted from the exhaust pipe, and the influence on the surrounding environment can be greatly reduced by means of the mode.

Description

TECHNICAL FIELD

[0001] The utility model belongs to steam turbine drainage heat recovery technical field, especially, relate to a power plant steam turbine drainage heat recovery device. BACKGROUND

[0002] The steam turbine (abbreviation "steam turbine") after work enters the condenser and is cooled into water (that is, drainage), this part of high temperature and high pressure liquid carries a large amount of energy that is not fully utilized, and the steam turbine drainage heat recovery device of power plant is an important energy-saving equipment, which aims at effectively utilizing the waste heat of low-pressure steam or condensate that is originally wasted, and improving the economy and energy efficiency of the whole unit.

[0003] When recovering heat, the exhaust steam waste heat is usually reused to achieve the effect of recovery, but the exhaust gas needs to be discharged to the outside after heat recovery, and the exhaust gas contains a large amount of particulate matter and impurities, etc., which will directly affect the surrounding environment, and with long-term emission, it will seriously pollute the surrounding environment and have a certain impact on human health. UTILITY MODEL CONTENTS

[0004] The utility model discloses a power plant steam turbine drainage heat recovery device, which is characterized by setting a filtering mechanism, specifically, after the exhaust gas waste heat is utilized, it enters one of the filtering boxes through the flow port, the ceramic matrix composite in the ceramic matrix composite placing box can filter and intercept the exhaust gas for the first time, and then fine filtering is carried out through the double-layer high molecular polymer filter element, which can achieve more fine filtering, has good adsorption and purification effect, and the filtered exhaust gas is discharged from the exhaust pipe, which can greatly reduce the impact on the surrounding environment, and solves the problem that the exhaust gas needs to be discharged to the outside after heat recovery, and the exhaust gas contains a large amount of particulate matter and impurities, which will directly affect the surrounding environment.

[0005] To solve the above technical problems, the utility model is realized by the following technical schemes:

[0006] The utility model discloses a power plant steam turbine drainage heat recovery device, which is characterized by setting a filtering mechanism, specifically, after the exhaust gas waste heat is utilized, it enters one of the filtering boxes through the flow port, the ceramic matrix composite in the ceramic matrix composite placing box can filter and intercept the exhaust gas for the first time, and then fine filtering is carried out through the double-layer high molecular polymer filter element, which can achieve more fine filtering, has good adsorption and purification effect, and the filtered exhaust gas is discharged from the exhaust pipe, which can greatly reduce the impact on the surrounding environment, and solves the problem that the exhaust gas needs to be discharged to the outside after heat recovery, and the exhaust gas contains a large amount of particulate matter and impurities, which will directly affect the surrounding environment.

[0007] The filtering mechanism is arranged at the top of the recycling box, comprises two filtering boxes fixedly connected at the top of the recycling box, two flow openings are formed in the top of the recycling box, a ceramic matrix composite placing box is positioned and arranged at the inner bottom of the filtering box, a mesh cover is arranged at the top of the ceramic matrix composite placing box through bolt mounting, two layers of frames are arranged above the mesh cover, a high polymer filter core is arranged in the frame, the frame and the high polymer filter core are inserted into the filtering box, and openings are formed in the sides away from each other of the two filtering boxes.

[0008] The recycling mechanism is arranged in the recycling box, and comprises a plurality of S-shaped pipelines arranged in the recycling box.

[0009] The ceramic matrix composite placing box is used for adding ceramic matrix composite, the bottom of the ceramic matrix composite placing box and the mesh cover are arranged in a honeycomb shape, and the flow opening corresponds to the bottom of the filtering box.

[0010] Further, the recycling box is provided with a notch at the bottom, a valve is arranged on the air inlet pipe, an electric push rod is fixedly connected to the back of the recycling box, and the air inlet pipe is used for connecting the waste gas conveying pipe.

[0011] Further, the filtering box is provided with an opening at the outer side, a cover plate is inserted into the opening, the cover plate is fixedly connected to the filtering box through bolts, an exhaust pipe is fixedly connected to the top of the filtering box through bolts, and the bottom of the exhaust pipe is provided with a square plate.

[0012] Further, the recycling mechanism is provided with a connecting pipe fixedly connected to one end of the top and one end of the bottom, the connecting pipe penetrates through the recycling box and extends to the outside, a speed reduction pipe is fixedly connected to the front of the lower connecting pipe, a plurality of partition strips are fixedly connected to the inner wall of the speed reduction pipe, supports are fixedly connected to the top and the bottom of the S-shaped pipeline, and the front and the back of the supports are fixedly connected to the inner wall of the recycling box.

[0013] The upper connecting pipe is connected with a water conveying pipeline, and the speed reduction pipe is connected with a drain pipe.

[0014] Further, the inside top of the recycling box is provided with a sealing plate, the top of the sealing plate is in contact with the inside wall top of the recycling box, the left side and the right side of the sealing plate are provided with a limiting seat, the back of the sealing plate is fixedly connected with the output end of the electric push rod, a dust cover is arranged on the outside of the upper output rod of the electric push rod, the front of the dust cover is fixedly connected with the back of the sealing plate, and the back of the dust cover is fixedly connected with the inside wall of the recycling box; the sealing plate is driven to move by starting the electric push rod, so that another flow port is opened, at this time, the filtering channel can be switched, and the demand of continuous filtering is met.

[0015] Further, the limiting seat is L-shaped, the top of the limiting seat is fixedly connected with the inside wall top of the recycling box, a limiting groove is arranged in the inside of the limiting seat, an extrusion plate is slidably connected in the limiting groove, the top of the extrusion plate is in contact with the bottom of the sealing plate, and a plurality of springs are fixedly connected with the bottom of the extrusion plate; the extrusion plate pushes the sealing plate upward through the elastic force of the springs, so that the sealing plate is tightly attached to the inside wall top of the recycling box, and a better sealing effect is achieved.

[0016] The utility model has the advantages of the following beneficial effects:

[0017] 1、The utility model discloses a filtering mechanism is set up, specifically is waste heat after being utilized, will enter one of the filtering case through the flow port, the ceramic matrix composite in the ceramic matrix composite placing box will carry out first filtration interception to waste gas, then again through double -layer high molecular polymer filter element fine filtration, this mode can reach more fine filtration, has good adsorption and purifying effect, and the waste gas after filtering finally is discharged from the exhaust pipe, and this mode can greatly reduce the influence on the surrounding environment.

[0018] 2、The utility model discloses a recycling mechanism is set up, specifically is waste heat will heat the water flow in S -shaped pipeline, because S -shaped pipeline is S -shaped setting, therefore can increase the contact area with waste gas, and is provided with multiple S -shaped pipelines can improve the utilization of waste heat again, and is provided with a plurality of partition strips in the speed reducer of the drain, will reduce the discharge speed of water flow, makes the water flow stay in S -shaped pipeline longer, reaches better heating, thereby reduces energy use.

[0019] Of course, any product implementing the utility model does not necessarily need to achieve all the advantages described above. DRAWINGS

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a front view cross-sectional structural diagram of the recycling bin of this utility model;

[0023] Figure 3 This is a schematic diagram of the bottom structure of the recycling bin of this utility model;

[0024] Figure 4 This is a schematic diagram of the exploded internal structure of the filter box of this utility model;

[0025] Figure 5 This is a schematic diagram of the top structure of the recycling bin of this utility model;

[0026] Figure 6 This is a bottom view sectional structural diagram of the recycling bin of this utility model;

[0027] Figure 7 This utility model Figure 6 A magnified structural diagram of A in the middle;

[0028] Figure 8 This is a schematic diagram of the overall structure of the sealing plate and the limiting seat of this utility model.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Recycling bin; 11. Annular bottom shell; 12. Air inlet pipe; 13. Groove; 14. Electric push rod; 141. Dust cover; 15. Flow port; 2. Filtration mechanism; 21. Filter box; 211. Opening; 212. Ceramic matrix composite material placement box; 213. Mesh cover; 214. Frame; 215. Polymer filter element; 22. Cover plate; 23. Exhaust pipe; 24. Sealing plate; 25. Limiting seat; 251. Extrusion plate; 252. Spring; 3. Recycling mechanism; 31. S-shaped pipe; 311. Connecting pipe; 32. Support; 33. Deceleration pipe; 34. Divider strip. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0032] Please see Figures 1-8 As shown, this utility model is a heat recovery device for steam turbine condensate in a power plant, including a recovery box 1, an annular bottom shell 11 fixedly connected to the bottom of the recovery box 1, and several air inlet pipes 12 fixedly connected to the bottom of the annular bottom shell 11, and also including:

[0033] The filtration mechanism 2 is located on top of the recovery box 1. The filtration mechanism 2 includes two filter boxes 21 fixedly connected to the top of the recovery box 1. Two flow ports 15 are opened on the top of the recovery box 1. A ceramic matrix composite material placement box 212 is positioned at the bottom inside the filter box 21. A mesh cover 213 is bolted to the top of the ceramic matrix composite material placement box 212. Two frames 214 are arranged above the mesh cover 213. A polymer filter element 215 is installed inside the frame 214. Both the frame 214 and the polymer filter element 215 are inserted into the interior of the filter box 21. Openings 211 are opened on the opposite sides of the two filter boxes 21. After the waste heat is utilized, it enters one of the filter boxes 21 through the flow ports 15. The ceramic matrix composite material in the ceramic matrix composite material placement box 212 will first filter and intercept the exhaust gas, and then it will be finely filtered through the double-layer polymer filter element 215. This method can achieve more refined filtration and has good adsorption and purification effects. Finally, the filtered exhaust gas is discharged from the exhaust pipe 23. This method can significantly reduce the impact on the surrounding environment. There is also a recycling mechanism 3, which is located inside the recycling box 1. The recycling mechanism 3 includes several S-shaped pipes 31 located inside the recycling box 1. The ceramic matrix composite material placement box 212 is used to add ceramic matrix composite material. The bottom of the ceramic matrix composite material placement box 212 and the mesh cover 213 are both honeycomb-shaped. The flow port 15 corresponds to the bottom of the filter box 21.

[0034] The bottom of the recycling bin 1 has a slot 13, and a valve is installed on the air inlet pipe 12. An electric push rod 14 is fixedly connected to the back of the recycling bin 1, and the air inlet pipe 12 is used to connect to the waste gas conveying pipe.

[0035] An opening 211 is provided on the outside of the filter box 21. A cover plate 22 is inserted into the opening 211. The cover plate 22 is fixedly connected to the filter box 21 by bolts. An exhaust pipe 23 is fixedly connected to the top of the filter box 21 by bolts. The bottom of the exhaust pipe 23 is a square plate.

[0036] The top and bottom ends of the recycling mechanism 3 are fixedly connected to connecting pipes 311. The front of the connecting pipes 311 penetrates the recycling box 1 and extends to the outside. The front of the lower connecting pipe 311 is fixedly connected to a deceleration pipe 33. Several partition strips 34 are fixedly connected to the inner wall of the deceleration pipe 33. The top and bottom of the S-shaped pipe 31 are fixedly connected to supports 32. The front and back of the supports 32 are fixedly connected to the inner wall of the recycling box 1. The waste heat of the exhaust gas will heat the water flow in the S-shaped pipe 31. Since the S-shaped pipe 31 is S-shaped, it can increase the contact area with the exhaust gas. The multiple S-shaped pipes 31 can further improve the utilization of waste heat of the exhaust gas. The deceleration pipe 33 at the drainage point is equipped with multiple partition strips 34, which will reduce the drainage speed of the water flow and make the water flow stay in the S-shaped pipe 31 for a longer time, achieving better heating and thus reducing energy consumption. The upper connecting pipe 311 is connected to the water supply pipe, and the deceleration pipe 33 is connected to the drainage pipe.

[0037] A sealing plate 24 is provided on the top of the inner side of the recycling bin 1. The top of the sealing plate 24 contacts the top of the inner wall of the recycling bin 1. Limit seats 25 are provided on the left and right sides of the sealing plate 24. The back of the sealing plate 24 is fixedly connected to the output end of the electric push rod 14. A dust cover 141 is sleeved on the outer side of the output rod of the electric push rod 14. The front of the dust cover 141 is fixedly connected to the back of the sealing plate 24, and the back of the dust cover 141 is fixedly connected to the inner wall of the recycling bin 1.

[0038] The limiting seat 25 is L-shaped. The top of the limiting seat 25 is fixedly connected to the top of the inner wall of the recycling bin 1. A limiting groove is opened inside the limiting seat 25. A squeezing plate 251 is slidably connected inside the limiting groove. The top of the squeezing plate 251 contacts the bottom of the sealing plate 24. Several springs 252 are fixedly connected to the bottom of the squeezing plate 251. The bottom of the springs 252 is fixedly connected to the inner wall of the limiting groove.

[0039] One specific application of this embodiment is:

[0040] In use, the upper connecting pipe 311 is connected to the water pipe, and the deceleration pipe 33 is connected to the drain pipe, thereby transporting the water flow into several S-shaped pipes 31. The air inlet pipe 12 is connected to the exhaust gas conveying pipe. By opening the valve on the air inlet pipe 12, the exhaust gas is transported into the annular bottom shell 11. The exhaust gas transported into the annular bottom shell 11 will enter the recovery box 1 through the slot 13. At this time, the waste heat of the exhaust gas will heat the water flow in the S-shaped pipes 31. Since the S-shaped pipes 31 are S-shaped, the contact area with the exhaust gas can be increased, thereby improving the utilization rate of the waste heat of the exhaust gas. The multiple S-shaped pipes 31 can further improve the utilization of the waste heat of the exhaust gas. In the deceleration pipe 33 at the drain, multiple partitions 34 are set to reduce the opening size, thereby reducing the discharge speed of the water flow, so that the water flow stays in the S-shaped pipes 31 for a longer time, achieving better heating. Finally, the heated hot water is transported into the boiler, thereby reducing energy consumption.

[0041] The waste gas after heat recovery moves upward and enters one of the filter boxes 21 through the flow port 15. The ceramic matrix composite material placed in the box 212, such as silicon carbide (SiC) and boron nitride (BN), is used to intercept submicron particles. Then, it is finely filtered through the double-layer polymer filter element 215. Finally, the filtered waste gas is discharged from the exhaust pipe 23. This method can significantly reduce the impact on the surrounding environment and achieve finer filtration through the ceramic matrix composite material and polymer filter element 215, with good adsorption and purification effects.

[0042] Because the top of the recycling bin 1 has two flow ports 15, and one of the flow ports 15 is folded by the sealing plate 24, only one of the two filter boxes 21 on the top of the recycling bin 1 is used. When the material in the filter box 21 needs to be replaced, the sealing plate 24 is moved by activating the electric push rod 14, thereby opening the other flow port 15 and sealing the flow port 15 corresponding to the area to be replaced. Since the compression plate 251 pushes the sealing plate 24 upward by the elastic force of the spring 252, the sealing plate 24 can be tightly attached to the top of the inner wall of the recycling bin 1, thereby achieving a better sealing effect without affecting the movement of the sealing plate 24. The output rod of the electric push rod 14 is covered with a dust cover 141 to protect the output rod. The dust cover 141 is made of silicone rubber and has good high temperature resistance. After the sealing plate 24 is replaced, another filter box 21 can be used to filter the exhaust gas. The exhaust pipe 23 on the filter box 21 that needs to be replaced is removed, and the cover plate 22 is removed. The polymer filter element 215 and the frame 214 can be taken out together, and the ceramic matrix composite material placement box 212 can be taken out. The material in the ceramic matrix composite material placement box 212 and the polymer filter element 215 can be replaced. This method can meet the needs of continuous filtration of exhaust gas.

[0043] It should be noted that the control of the electric actuator 14 and the water flow in this application can both be achieved by using a program set in the control panel and inputting relevant parameters as needed for automated control. This control method can be achieved using existing technology.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present 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.

[0045] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A heat recovery device for steam turbine condensate in a power plant, comprising a recovery box (1), wherein an annular bottom shell (11) is fixedly connected to the bottom of the recovery box (1), and a plurality of air inlet pipes (12) are fixedly connected to the bottom of the annular bottom shell (11), characterized in that, Also includes: A filtration mechanism (2) is located on the top of a recycling bin (1). The filtration mechanism (2) includes two filter boxes (21) fixedly connected to the top of the recycling bin (1). The top of the recycling bin (1) has two flow ports (15). A ceramic matrix composite material placement box (212) is positioned at the bottom inside the filter box (21). A mesh cover (213) is bolted to the top of the ceramic matrix composite material placement box (212). Two frames (214) are provided above the mesh cover (213). A polymer filter element (215) is installed inside the frame (214). The frame (214) and the polymer filter element (215) are both inserted into the filter box (21). An opening (211) is provided on the side of each filter box (21) that is far away from each other. The recycling mechanism (3) is located inside the recycling bin (1) and includes several S-shaped pipes (31) located inside the recycling bin (1). The ceramic matrix composite material placement box (212) is used to add ceramic matrix composite material. The bottom of the ceramic matrix composite material placement box (212) and the mesh cover (213) are both honeycomb-shaped. The flow port (15) corresponds to the bottom of the filter box (21).

2. The heat recovery device for steam turbine condensate drain in a power plant according to claim 1, characterized in that, The bottom of the recycling bin (1) is provided with a slot (13), a valve is installed on the air inlet pipe (12), an electric push rod (14) is fixedly connected to the back of the recycling bin (1), and the air inlet pipe (12) is used to connect to the waste gas conveying pipe.

3. The heat recovery device for steam turbine condensate drain in a power plant according to claim 2, characterized in that, The filter box (21) has an opening (211) on the outside. A cover plate (22) is inserted into the opening (211). The cover plate (22) is fixedly connected to the filter box (21) by bolts. An exhaust pipe (23) is fixedly connected to the top of the filter box (21) by bolts. The bottom of the exhaust pipe (23) is a square plate.

4. The heat recovery device for steam turbine condensate drain in a power plant according to claim 3, characterized in that, The recycling mechanism (3) is fixedly connected to a connecting pipe (311) at one end of the top and one end of the bottom. The front of the connecting pipe (311) passes through the recycling box (1) and extends to the outside. The front of the connecting pipe (311) located below is fixedly connected to a deceleration pipe (33). Several partition strips (34) are fixedly connected to the inner wall of the deceleration pipe (33). The top and bottom of the S-shaped pipe (31) are fixedly connected to a bracket (32). The front and back of the bracket (32) are fixedly connected to the inner wall of the recycling box (1). The upper connecting pipe (311) is connected to the water supply pipe, and the deceleration pipe (33) is connected to the drain pipe.

5. The heat recovery device for steam turbine condensate drain in a power plant according to claim 4, characterized in that, The top of the inner side of the recycling bin (1) is provided with a sealing plate (24). The top of the sealing plate (24) is in contact with the top of the inner wall of the recycling bin (1). Limit seats (25) are provided on the left and right sides of the sealing plate (24). The back of the sealing plate (24) is fixedly connected to the output end of the electric push rod (14). A dust cover (141) is provided on the outer side of the output rod of the electric push rod (14).

6. The heat recovery device for steam turbine condensate drain in a power plant according to claim 5, characterized in that, The limiting seat (25) is L-shaped. The top of the limiting seat (25) is fixedly connected to the top of the inner wall of the recycling bin (1). A limiting groove is opened inside the limiting seat (25). A squeezing plate (251) is slidably connected inside the limiting groove. The top of the squeezing plate (251) contacts the bottom of the sealing plate (24). Several springs (252) are fixedly connected to the bottom of the squeezing plate (251). The bottom of the springs (252) is fixedly connected to the inner wall of the limiting groove.

7. A heat recovery device for steam turbine condensate drains in a power plant according to claim 5, characterized in that, The front of the dust cover (141) is fixedly connected to the back of the sealing plate (24), and the back of the dust cover (141) is fixedly connected to the inner wall of the recycling bin (1).

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