A heat supply backwater device for a thermal power plant

Abstract

This invention discloses a heating return water device for thermal power plants, relating to the field of heating return water equipment for thermal power plants. It includes a return water pipe, one end of which is fixedly fitted with a push ring. A connecting pipe is provided at one end of the return water pipe, and a fixing ring is fixedly fitted at one end of the connecting pipe. Two symmetrical mounting slots are formed at one end of the fixing ring. A mounting box is slidably connected to the inner wall of each mounting slot. A rack is fixedly installed at one end of the inner wall of the mounting box. A fixing plate is fixedly connected to one end of the rack. Two screws are threaded through one end of the fixing plate. A gear meshes with the other end of the rack. In this invention, when the air pressure inside the return water pipe is too high, the air pressure pushes the return water pipe. Through the engagement of the gear and rack, the return water pipe extends from the connecting pipe, increasing the total length of the return water pipe and the connecting pipe, thereby reducing the air pressure in the return water pipe and preventing steam leakage.

Description

Technical Field

[0001] This invention relates to the technical field of heating return water equipment for thermal power plants, specifically a heating return water device for thermal power plants. Background Technology

[0002] my country's energy structure dictates that power generation is currently dominated by coal. With energy becoming increasingly scarce, improving the efficiency of coal-fired power generating units and reducing energy consumption have become the primary tasks of thermal power plants. The steam turbine unit's return water system, which utilizes a portion of the extracted steam from the turbine to heat the boiler feedwater, can significantly increase the average heat absorption temperature of the entire thermodynamic cycle, reduce cold source losses during the cycle, and thus lower overall energy consumption. It is an important component of the thermal power plant's thermal system.

[0003] In the prior art, such as the Chinese patent number CN116282725A, "A heating return water mechanism for a thermal power plant", a ferrode removal box, a cation exchanger and a deaerator are connected in sequence through a return water pipe. The ferrode removal box is provided with a number of movably connected magnetic plates, and a return water channel is provided between the magnetic plates and the inner wall of the ferrode removal box.

[0004] However, in existing technologies, when steam turbine units use a return water device for reheating, the return water pipes are mostly made of sealed steel pipes. When the steam turbine unit operates at excessive intensity, the pressure generated by the steam inside the return water pipes will be too high. The high pressure inside the return water pipes will exert a great force on the pipes, causing gaps to appear at the connection between the return water pipes and the heaters, resulting in steam leakage. The ejected steam will affect the working environment and even endanger the personal safety of the workers. Summary of the Invention

[0005] The purpose of this invention is to provide a heat return water device for thermal power plants, which solves the problem mentioned in the background art that when a steam turbine unit uses a heat return water device for reheating, the return water pipe is mostly made of sealed steel pipe. When the steam turbine unit's working intensity is too high, the pressure generated by the steam inside the return water pipe will be too high. The high pressure inside the return water pipe will exert a great force on the pipe, resulting in gaps at the connection between the return water pipe and the heater, causing steam leakage. The ejected steam will affect the working environment and even endanger the personal safety of the workers.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a heating return water device for a thermal power plant, comprising a return water pipe, a push ring fixedly sleeved at one end of the return water pipe, a connecting pipe provided at one end of the return water pipe, a fixing ring fixedly sleeved at one end of the connecting pipe, two No. 1 mounting slots symmetrically opened at one end of the fixing ring, an mounting box slidably connected to the inner wall of the No. 1 mounting slot, a rack fixedly installed at one end of the inner wall of the mounting box, a fixing plate fixedly connected to one end of the rack, two screws through-mounted at one end of the fixing plate, a gear meshing at the other end of the rack, a No. 1 circular hole through-mounted at the top and middle of the gear, four No. 2 circular holes opened at the top of the gear, a No. 1 cylinder fixedly sleeved on the inner wall of the No. 1 circular hole, a No. 2 cylinder fixedly sleeved on the inner wall of one of the No. 2 circular holes, and a limit spring provided at one end of the mounting box.

[0007] Preferably, the outer surface of the return water pipe is connected to a pressure-dividing pipe, and a sealing baffle is provided at one end of the inner wall of the pressure-dividing pipe. Four venting slots are opened through the top of the sealing baffle. A fixing column is fixedly installed on the inner wall of the venting slot near one edge. A sleeve is movably sleeved on the outer surface of the fixing column. A spring is provided between the fixing column and the sleeve. A rotating block is fixedly installed on the outer surface of the sleeve.

[0008] Preferably, the inner wall of the connecting pipe is provided with multiple No. 2 installation grooves, one end of the return water pipe is fixedly fitted with two sealing gaskets, one end of the connecting pipe is provided with a No. 3 sealing installation component, the other end of the return water pipe is provided with a No. 1 sealing installation component, and one end of the pressure dividing pipe is provided with a No. 2 sealing installation component.

[0009] Preferably, a heating device is provided at one end of the return water pipe and a heating device is provided at the other end of the return water pipe.

[0010] Preferably, one end of the limiting spring is fixedly connected to one end of the inner wall of the mounting box, and the other end of the limiting spring is fixedly connected to the top of the second cylinder. The gear is rotatably connected to the mounting box through the first cylinder set thereon.

[0011] Preferably, the size of the sealing baffle is adapted to the inner wall size of the pressure-distributing pipe, and the outer edge of the sealing baffle is fixedly sleeved with the inner wall of the pressure-distributing pipe.

[0012] Preferably, one end of the spring is fixedly connected to the outer surface of the fixed post, the other end of the spring is fixedly connected to the inner wall of the sleeve, and one end of the rotating block is slidably connected to the inner wall of the venting groove.

[0013] Preferably, the second mounting groove is evenly distributed on the inner wall of the connecting pipe, and the outer surface of the sealing gasket is engaged with the inner wall of the second mounting groove.

[0014] Preferably, the connecting pipe is connected to the return water pipe, one end of the return water pipe is located inside the connecting pipe, and the rack is fixedly installed with the push ring by two screws set thereon.

[0015] Preferably, the connecting pipe is fixedly installed with the heating device via a No. 3 sealing installation component, the return water pipe is fixedly installed with the heating device via a No. 1 sealing installation component, and the pressure dividing pipe is fixedly installed with the heating device via a No. 2 sealing installation component.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In this invention, when the air pressure inside the return water pipe is too high, the air pressure will push the return water pipe. Through the cooperation between the gear and the rack, the return water pipe will extend from the connecting pipe, increasing the total length of the return water pipe and the connecting pipe, thereby reducing the air pressure in the return water pipe and preventing steam leakage from the return water pipe.

[0018] 2. In this invention, by utilizing the pressure-dividing effect of the pressure-dividing pipe on the return water pipe, the steam inside the pipe can enter the heating device body more quickly, which can further reduce the air pressure in the return water pipe and effectively reduce the heat loss in the return water pipe, thereby reducing the overall energy consumption of the device.

[0019] 3. In this invention, by setting a second installation groove and a sealing gasket in the connecting pipe and the return water pipe, and by setting sealing installation components at the connection ports of the connecting pipe, the return water pipe and the pressure dividing pipe, the overall airtightness of the device is further improved and the safety of the device is increased. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a thermal power plant heating return water device according to the present invention;

[0021] Figure 2 This is a cross-sectional schematic diagram of the outlet pipe and pressure-dividing pipe of a heating return water device for a thermal power plant according to the present invention.

[0022] Figure 3 This is a partial structural schematic diagram of a thermal power plant heating return water device according to the present invention;

[0023] Figure 4 This is a cross-sectional internal structural diagram of the mounting box for a thermal power plant heating return water device according to the present invention.

[0024] Figure 5This is an exploded schematic diagram of a gear in a thermal power plant heating return water device according to the present invention.

[0025] Figure 6 This is a partial structural diagram of a pressure-distributing pipeline in a thermal power plant heating return water device according to the present invention.

[0026] Figure 7 This is a cross-sectional schematic diagram of a sealing baffle of a thermal power plant heating return water device according to the present invention.

[0027] Figure 8 This is a cross-sectional view of the outlet pipe and connecting pipe of a thermal power plant heating return water device according to the present invention.

[0028] In the diagram: 1. Heating device; 2. Heating unit; 3. Return water pipe; 301. Push ring; 302. Sealing gasket; 4. Pressure dividing pipe; 5. Connecting pipe; 501. Fixing ring; 502. Mounting slot 1; 503. Mounting slot 2; 6. Mounting box; 7. Rack; 701. Fixing plate; 702. Screw; 8. Gear; 801. Hole 1; 802. Hole 2; 803. Cylinder 1; 804. Cylinder 2; 9. Limiting spring; 10. Sealing baffle; 1001. Vent groove; 11. Fixing column; 12. Spring spring; 13. Sleeve; 14. Rotating block; 15. Sealing installation component 1; 16. Sealing installation component 2; 17. Sealing installation component 3. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0030] Reference Figure 1-8As shown: A heating return water device for a thermal power plant includes a return water pipe 3. A push ring 301 is fixedly sleeved at one end of the return water pipe 3. A connecting pipe 5 is provided at one end of the return water pipe 3. A fixing ring 501 is fixedly sleeved at one end of the connecting pipe 5. Two mounting grooves 502 are symmetrically opened at one end of the fixing ring 501. An installation box 6 is slidably connected to the inner wall of the mounting groove 502. A rack 7 is fixedly installed at one end of the inner wall of the installation box 6. A fixing plate 701 is fixedly connected to one end of the rack 7. Two screws 702 are installed through one end of the fixing plate 701. A gear 8 meshes with the other end of the rack 7. A circular hole 801 is opened through the top and middle part of the gear 8. The top of the wheel 8 has four No. 2 circular holes 802. The inner wall of the No. 1 circular hole 801 is fixedly sleeved with a No. 1 cylinder 803. The inner wall of one of the No. 2 circular holes 802 is fixedly sleeved with a No. 2 cylinder 804. One end of the mounting box 6 is provided with a limit spring 9. One end of the limit spring 9 is fixedly connected to one end of the inner wall of the mounting box 6, and the other end of the limit spring 9 is fixedly connected to the top of the No. 2 cylinder 804. The gear 8 is rotatably connected to the mounting box 6 through the No. 1 cylinder 803 set on it. The connecting pipe 5 is connected to the return water pipe 3. One end of the return water pipe 3 is set inside the connecting pipe 5. The rack 7 is fixedly installed with the push ring 301 through two screws 702 set on it.

[0031] In this embodiment, when the steam pressure in the heating device 1 is too high, the steam pressure will push the inner wall of the return water pipe 3. When the inner wall of the return water pipe 3 is pushed, it will drive the rack 7 connected to it to move through the push ring 301. When the rack 7 moves, it will drive the gear 8 to rotate. The limiting spring 9 will rotate with the gear 8 through the second cylinder 804. The greater the force inside the return water pipe 3, the longer the rack 7 will move, so that the return water pipe 3 inside the connecting pipe 5 will extend out, thereby increasing the total length of the return water pipe 3 and the connecting pipe 5, thereby reducing the pressure inside the return water pipe 3. When the air pressure inside the return water pipe 3 decreases, the limiting spring 9 will pull the gear 8 and reset the return water pipe 3 through the rack 7. When the air pressure is too high, steam will also enter the heating device 2 from the pressure dividing pipe 4, further reducing the air pressure in the return water pipe 3, thereby preventing steam leakage in the return water pipe 3. Example 2

[0032] Figure 1 , Figure 2 , Figure 6 and Figure 7As shown, the outer surface of the return water pipe 3 is connected to the pressure-dividing pipe 4. A sealing baffle 10 is provided at one end of the inner wall of the pressure-dividing pipe 4. Four venting slots 1001 are opened through the top of the sealing baffle 10. A fixing column 11 is fixedly installed on the inner wall of the venting slot 1001 near one edge. A sleeve 13 is movably sleeved on the outer surface of the fixing column 11. A spring-loaded spring 12 is provided between the fixing column 11 and the sleeve 13. A rotating block 14 is fixedly installed on the outer surface of the sleeve 13. The size of the sealing baffle 10 is adapted to the inner wall size of the pressure-dividing pipe 4. The outer edge of the sealing baffle 10 is fixedly sleeved with the inner wall of the pressure-dividing pipe 4. One end of the spring-loaded spring 12 is fixedly connected to the outer surface of the fixing column 11. The other end of the spring-loaded spring 12 is fixedly connected to the inner wall of the sleeve 13. One end of the rotating block 14 is slidably connected to the inner wall of the venting slot 1001.

[0033] In this embodiment, when the air pressure in the return water pipe 3 is too high, the pressure generated inside it will push the rotating block 14 on the sealing baffle 10 in the pressure dividing pipe 4. After being subjected to pressure, the rotating block 14 will rotate downwards, so that the steam in the return water pipe 3 can enter the pressure dividing pipe 4 through the vent 1001. This part of the steam will enter the heating device 2 from the pressure dividing pipe 4 for reheating. This not only further reduces the air pressure in the return water pipe 3, but also improves the steam conduction efficiency in the return water pipe 3, reduces the heat loss in the return water pipe 3, and reduces the energy consumption required for reheating the steam in the return water pipe 3, thereby reducing the overall energy consumption of the device. Example 3

[0034] according to Figure 1 , Figure 2 , Figure 3 and Figure 8 As shown, the inner wall of the connecting pipe 5 is provided with multiple second installation grooves 503. Two sealing gaskets 302 are fixedly sleeved at one end of the return water pipe 3. A third sealing installation component 17 is provided at one end of the connecting pipe 5. A first sealing installation component 15 is provided at the other end of the return water pipe 3. A second sealing installation component 16 is provided at one end of the pressure dividing pipe 4. A heating device 1 is provided at one end of the return water pipe 3. A heating device 2 is provided at the other end of the return water pipe 3. The second installation grooves 503 are evenly distributed on the inner wall of the connecting pipe 5. The outer surface of the sealing gaskets 302 is engaged with the inner wall of the second installation grooves 503. The connecting pipe 5 is fixedly installed with the heating device 1 through the third sealing installation component 17. The return water pipe 3 is fixedly installed with the heating device 2 through the first sealing installation component 15. The pressure dividing pipe 4 is fixedly installed with the heating device 2 through the second sealing installation component 16.

[0035] In this embodiment, when the return water pipe 3 extends from the connecting pipe 5, the sealing gasket 302 on the return water pipe 3 moves with the return water pipe 3. The two sealing gaskets 302 are continuously engaged in the multiple second mounting slots 503. The sealing gaskets 302 ensure good airtightness between the return water pipe 3 and the connecting pipe 5. At the same time, the first sealing mounting component 15, the second sealing mounting component 16, and the third sealing mounting component 17 are existing technologies, which can ensure good sealing of the fixed connection of the pipe. This ensures good airtightness of the entire device, further preventing steam leakage, reducing heat loss in the return water pipe 3, and increasing the safety of the device.

[0036] The operating method and working principle of this device are as follows: When the pressure inside the return water pipe 3 is too high, the steam inside will exert pressure on the bend of the return water pipe 3. This will push the return water pipe 3, thereby driving the rack 7 to move through the push ring 301. When the rack 7 moves, it will drive the gear 8 meshing with it to rotate. When the gear 8 rotates, it will pull the limit spring 9 through the second cylinder 804. The limit spring 9 will follow the rotation of the gear 8 and wrap around the outer surface of the first cylinder 803. The thrust generated by the steam will cause the return water pipe 3 to move, thus increasing the total length of the return water pipe 3 and the connecting pipe 5, thereby increasing the return water... The total amount of steam that pipe 3 and connecting pipe 5 can hold indirectly reduces the internal pressure of return water pipe 3, preventing steam leakage. Since the limit spring 9 is stretched, it will generate elastic force due to elastic deformation. When the internal pressure of return water pipe 3 decreases, the elastic force generated by the limit spring 9 will be greater than the thrust inside return water pipe 3. As a result, the limit spring 9 will pull the gear 8 to rotate in the opposite direction. The gear 8 will then drive the rack 7 to move. The rack 7 will drive the return water pipe 3 to re-enter the interior of connecting pipe 5 through the push ring 301 until the elastic force of the limit spring 9 is balanced with the thrust inside the return water pipe 3.

[0037] When the internal pressure of the return water pipe 3 is too high, the air pressure will push the rotating block 14 on the sealing baffle 10. The rotating block 14 will rotate downward due to the thrust. The steam in the return water pipe 3 will enter the pressure dividing pipe 4 through the vent 1001, and then enter the heating device 2 from the pressure dividing pipe 4 for reheating. When the rotating block 14 is pushed by the air pressure and rotates, the spring 12 on the rotating block 14 will be squeezed and contracted. The spring 12 will generate elastic force due to elastic deformation. When the elastic force generated by the spring 12 is greater than the air pressure thrust on the rotating block 14, the rotating block 14 will gradually rotate in the opposite direction due to the elastic force of the spring 12 until the elastic force and thrust on the rotating block 14 are balanced.

[0038] When the return water pipe 3 moves from the connecting pipe 5, the two sealing gaskets 302 on the return water pipe 3 will move along with it. When the two sealing gaskets 302 move, they will continuously engage with multiple second mounting slots 503. The sealing gaskets 302 are made of rubber, which can provide good airtightness between the connecting pipe 5 and the return water pipe 3. At the connection between the connecting pipe 5 and the heating device 1, the connection between the return water pipe 3 and the heating device 2, and the connection between the pressure dividing pipe 4 and the heating device 2, a third sealing mounting component 17, a first sealing mounting component 15, and a second sealing mounting component 16 are respectively provided. The three sealing mounting components should at least include a sealing joint, which is existing technology and will not be described in detail here.

[0039] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heating return water device for a thermal power plant, comprising a return water pipe (3), characterized in that: One end of the return water pipe (3) is fixedly sleeved with a push ring (301), and one end of the return water pipe (3) is provided with a connecting pipe (5). One end of the connecting pipe (5) is fixedly sleeved with a fixing ring (501). Two first installation slots (502) are symmetrically opened at one end of the fixing ring (501). An installation box (6) is slidably connected to the inner wall of the first installation slot (502). A rack (7) is fixedly installed at one end of the inner wall of the installation box (6). A fixing plate (701) is fixedly connected to one end of the rack (7). Two screws (702) are installed through one end of the fixed plate (701). The other end of the rack (7) is meshed with a gear (8). A first round hole (801) is opened through the top of the gear (8) and in the middle part. Four second round holes (802) are opened at the top of the gear (8). A first cylinder (803) is fixedly sleeved on the inner wall of the first round hole (801). A second cylinder (804) is fixedly sleeved on the inner wall of one of the second round holes (802). A limit spring (9) is provided at one end of the mounting box (6). One end of the limiting spring (9) is fixedly connected to one end of the inner wall of the mounting box (6), and the other end of the limiting spring (9) is fixedly connected to the top of the second cylinder (804). The gear (8) is rotatably connected to the mounting box (6) through the first cylinder (803) set thereon. The connecting pipe (5) is connected to the return water pipe (3), one end of the return water pipe (3) is set inside the connecting pipe (5), and the rack (7) is fixedly installed with the push ring (301) by two screws (702) set on it; When the pressure inside the return water pipe (3) is too high, the steam inside will exert pressure on the bend of the return water pipe (3), and the return water pipe (3) will be pushed by the steam.

2. The heating return water device for a thermal power plant according to claim 1, characterized in that: The outer surface of the return water pipe (3) is connected to a pressure-dividing pipe (4). A sealing baffle (10) is provided at one end of the inner wall of the pressure-dividing pipe (4). Four ventilation slots (1001) are opened through the top of the sealing baffle (10). A fixing column (11) is fixedly installed on the inner wall of the ventilation slot (1001) near one end edge. A sleeve (13) is movably sleeved on the outer surface of the fixing column (11). A spring spring (12) is provided between the fixing column (11) and the sleeve (13). A rotating block (14) is fixedly installed on the outer surface of the sleeve (13).

3. A thermal power plant heating return water device according to claim 2, characterized in that: The inner wall of the connecting pipe (5) is provided with multiple No. 2 installation grooves (503). Two sealing gaskets (302) are fixedly sleeved at one end of the return water pipe (3). A No. 3 sealing installation component (17) is provided at one end of the connecting pipe (5). A No. 1 sealing installation component (15) is provided at the other end of the return water pipe (3). A No. 2 sealing installation component (16) is provided at one end of the pressure dividing pipe (4).

4. A thermal power plant heating return water device according to claim 3, characterized in that: A heating device (1) is provided at one end of the return water pipe (3), and a heating device (2) is provided at the other end of the return water pipe (3).

5. A thermal power plant heating return water device according to claim 2, characterized in that: The size of the sealing baffle (10) is adapted to the inner wall size of the pressure dividing pipe (4), and the outer edge of the sealing baffle (10) is fixedly sleeved with the inner wall of the pressure dividing pipe (4).

6. A thermal power plant heating return water device according to claim 2, characterized in that: One end of the spring (12) is fixedly connected to the outer surface of the fixed post (11), the other end of the spring (12) is fixedly connected to the inner wall of the sleeve (13), and one end of the rotating block (14) is slidably connected to the inner wall of the ventilation groove (1001).

7. A thermal power plant heating return water device according to claim 3, characterized in that: The second mounting groove (503) is evenly distributed on the inner wall of the connecting pipe (5), and the outer surface of the sealing gasket (302) is engaged with the inner wall of the second mounting groove (503).

8. A thermal power plant heating return water device according to claim 4, characterized in that: The connecting pipe (5) is fixedly installed with the heating device (1) by the No. 3 sealing installation component (17) set thereon, the return water pipe (3) is fixedly installed with the heating device (2) by the No. 1 sealing installation component (15) set thereon, and the pressure dividing pipe (4) is fixedly installed with the heating device (2) by the No. 2 sealing installation component (16) set thereon.

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