A flue gas connection device for thermal power plants

Abstract

This utility model discloses a flue gas connection device for thermal power plants, including a base plate. Boilers are fixedly connected to the top of the base plate at both the front and rear. The boiler's flue gas outlet is connected to a denitrification device, the denitrification device's flue gas outlet is connected to an air preheater, the air preheater's flue gas outlet is connected to a dust collector, and the dust collector's flue gas outlet is connected to an induced draft fan. An absorption tower is installed outside the induced draft fan. This utility model relates to the field of flue gas connection technology for thermal power plants. Through the cooperation between a first flue, a first electric valve, and a second flue, when one absorption tower malfunctions or when the flue gas from two boilers can be absorbed by one absorption tower, simply opening the first electric valve allows the flue gas to be transferred through one first flue, the second flue, and a connecting flue to the interior of another first flue, and finally to the interior of the absorption tower. This avoids the situation where, when one absorption tower malfunctions, the flue gas from the boiler on the side of the malfunctioning absorption tower cannot be discharged.

Description

Technical Field

[0001] This utility model relates to the field of flue gas connection technology in thermal power plants, specifically a flue gas connection device for thermal power plants. Background Technology

[0002] A thermal power plant, or coal-fired power plant for short, is a factory that uses combustible materials as fuel to produce electricity. Its basic production process is as follows: when the fuel is burned, it heats water to generate steam, which converts the chemical energy of the fuel into heat energy. The steam pressure drives the turbine to rotate, converting the heat energy into mechanical energy. Then, the turbine drives the generator to rotate, converting the mechanical energy into electrical energy.

[0003] Existing flue gas connection devices in thermal power plants use flanges and bolts to connect and fix flue gas to each other, thereby enabling the transport of generated flue gas.

[0004] However, existing flue connection devices in thermal power plants make it inconvenient to disassemble the flue when connecting it with flanges and bolts. Furthermore, the vibrations generated by the operation of various equipment in thermal power plants can easily loosen the bolts, potentially leading to flue gas leakage. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a flue gas connection device for thermal power plants, which solves the problems of inconvenience in disassembling the flue gas when connecting it with flanges and bolts, and the potential for flue gas leakage due to the vibration generated by the operation of various equipment in thermal power plants that can easily loosen the bolts.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a flue gas connection device for a thermal power plant, comprising a base plate, with boilers fixedly connected to the top of the base plate at both the front and rear. The boiler's flue gas outlet is connected to a denitrification device, the denitrification device's flue gas outlet is connected to an air preheater, the air preheater's flue gas outlet is connected to a dust collector, and the dust collector's flue gas outlet is connected to an induced draft fan. An absorption tower is installed outside the induced draft fan. The denitrification device, air preheater, dust collector, and induced draft fan are all fixedly connected to the top of the base plate. The thermal power plant flue gas connection device also includes a conveying device, which is positioned between the induced draft fan and the absorption tower. A fixing device is installed on the wall of the conveying device. The induced draft fan provides power to sequentially introduce the flue gas generated by boiler combustion into the denitrification device, air preheater, dust collector, and absorption tower, ultimately discharging it into the atmosphere through a chimney. The conveying device connects the flue gas generated by the two boilers, and the fixing device secures the conveying device.

[0007] Preferably, the conveying device includes two first flues, each connected to the output end of one of the two induced draft fans; a first electric valve is connected to the top of the first flue near the induced draft fan; a second flue is connected to the end of the first electric valve away from the first flue; a connecting flue is connected to the ends of the two second flues away from the first electric valve; and a connecting device is disposed between the second flues and the connecting flue. The flue gas drawn from the induced draft fans is introduced into the absorption tower through the first flues, and the flow direction of the flue gas inside the two first flues is controlled by the first electric valve, the second flues, and the connecting flue. The connecting device connects the second flues and the connecting flue.

[0008] Preferably, the connecting device includes a connecting ring, which is fixedly connected to the outer wall of the second flue; two connecting cylinders are provided, which are respectively fixedly connected to the outer walls of both ends of the connecting flue; a connecting sleeve is fixedly connected to the outer wall of the connecting cylinder and fits against the top of the connecting ring; a fixing ring is threadedly connected to the outer walls of the connecting ring and the connecting sleeve; wherein, by inserting the connecting cylinder into the inner wall of the connecting ring and moving the fixing ring on the connecting ring and the connecting sleeve, the connecting flue and the second flue are connected.

[0009] Preferably, an elastic sealing ring is fixedly connected to the top of the second flue.

[0010] Preferably, the fixing device includes a mounting component, which is fixedly connected to the outer wall of the fixing ring; a fixing strip is rotatably connected to the inner wall of the mounting component via a pin; a mounting plate is fixedly connected to the outer wall of the connecting cylinder; and a fixing rod is inserted into the inner wall of the mounting plate; wherein the fixing strip rotates on the inner wall of the mounting component, so that the fixing strip is placed on the inner wall of the mounting plate, and the fixing rod fixes the fixing strip and the mounting plate.

[0011] Preferably, a second electric valve connects the first flue and the absorption tower.

[0012] Beneficial effects

[0013] This utility model provides a flue gas connection device for thermal power plants. It offers the following advantages: Through the coordination of a first flue, a first electric valve, and a second flue, when a certain absorber tower malfunctions or when the flue gas from two boilers can be adequately absorbed by one absorber tower, simply opening the first electric valve allows the flue gas to be transferred through one first flue, the second flue, and a connecting flue to the interior of another first flue, ultimately reaching the absorber tower. This avoids the situation where, when one absorber tower malfunctions, the flue gas from the boiler on the side of the malfunctioning absorber tower cannot be discharged.

[0014] Through the cooperation of the connecting ring, connecting cylinder, and fixing ring, when it is necessary to connect the second flue and the connecting flue, the personnel move the connecting flue downwards, and the connecting cylinder is inserted into the inner wall of the connecting ring. At this time, the end faces of the connecting flue and the second flue are in contact, and the outer wall of the connecting cylinder is provided with a sealing gasket. After being inserted into the inner wall of the connecting ring, the sealing between the two is ensured. When the end faces of the connecting flue and the second flue are in contact, the bottom of the connecting sleeve and the top of the connecting ring are in contact, and the outer walls of both the connecting sleeve and the connecting ring are threaded, and the threads at the connection point are in a continuous state. The personnel can then fix the connecting sleeve and the connecting ring through the fixing ring. When it is necessary to disassemble the connecting flue, the fixing ring is moved downwards, which facilitates the disassembly of the connecting flue. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 for Figure 1 Structural diagram of the bottom plate, boiler, and air preheater;

[0017] Figure 3 for Figure 1 A schematic diagram of the structure of the central connecting flue, induced draft fan and fixed ring;

[0018] Figure 4 for Figure 2 A schematic diagram of the central connecting flue, the first electric valve, and the induced draft fan;

[0019] Figure 5 for Figure 3 A structural schematic diagram of the second flue, mounting components, and fixing strips;

[0020] Figure 6 for Figure 4 A structural diagram of the central connecting flue, mounting plate, and fixing rod;

[0021] Figure 7 for Figure 4 A schematic diagram of the structure of the fixed ring, connecting ring, and connecting sleeve.

[0022] In the diagram: 1. Base plate; 11. Boiler; 12. Denitrification device; 13. Air preheater; 14. Dust collector; 15. Exhaust fan; 16. Absorption tower; 2. Conveying device; 21. First flue; 22. First electric valve; 23. Second flue; 24. Connecting flue; 25. Connecting device; 251. Connecting ring; 252. Connecting cylinder; 253. Connecting sleeve; 254. Fixing ring; 3. Elastic sealing ring; 4. Fixing device; 41. Mounting component; 42. Fixing strip; 43. Mounting plate; 44. Fixing rod; 5. Second electric valve. Detailed Implementation

[0023] 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 protection scope of the present utility model.

[0024] Existing flue connection devices in thermal power plants make it inconvenient to disassemble the flue when connecting it with flanges and bolts. Furthermore, the vibrations generated by the operation of various equipment in thermal power plants can easily loosen the bolts, potentially leading to flue gas leakage.

[0025] In view of this, the present invention provides a flue gas connection device for thermal power plants. Through the cooperation between the first flue gas duct, the first electric valve and the second flue gas duct, when a certain absorption tower malfunctions or when the flue gas generated by two boilers can be absorbed by one absorption tower, the first electric valve is opened. The flue gas is then transferred to the interior of the other first flue gas duct through one first flue gas duct, the second flue gas duct and the connecting flue gas duct, and finally to the interior of the absorption tower. This avoids the situation where the flue gas generated by the boiler on the side of the malfunctioning absorption tower cannot be discharged when one absorption tower malfunctions.

[0026] Those skilled in the art can connect the components in this case sequentially. The specific connection and operation sequence should refer to the working principle described below. The detailed connection methods are well-known technologies in the field. The working principle and process are mainly described below.

[0027] Example 1: By Figure 1-7 It is known that a flue gas connection device for a thermal power plant includes a base plate 1. A boiler 11 is fixedly connected to the top of the base plate 1 at both the front and rear. The flue gas outlet of the boiler 11 is connected to a denitrification device 12. The flue gas outlet of the denitrification device 12 is connected to an air preheater 13. The flue gas outlet of the air preheater 13 is connected to a dust collector 14. The flue gas outlet of the dust collector 14 is connected to an induced draft fan 15. An absorption tower 16 is installed outside the induced draft fan 15. The denitrification device 12, air preheater 13, dust collector 14, and induced draft fan 15 are all fixedly connected to the top of the base plate 1. The power plant flue gas connection device also includes a conveying device 2 and a fixing device 4. The conveying device 2 is located between the induced draft fan 15 and the absorption tower 16; the fixing device 4 is located on the wall of the conveying device 2. The induced draft fan 15 provides power to sequentially introduce the flue gas generated by the combustion of the boiler 11 into the denitrification device 12, the air preheater 13, the dust collector 14, and the absorption tower 16, and finally discharges it into the atmosphere through the chimney. The conveying device 2 connects the flue gas generated by the two boilers 11, and the fixing device 4 fixes the conveying device 2.

[0028] In the specific implementation process, it is worth noting that the boiler 11 burns fuel to release heat, and the flue gas generated by the combustion of the boiler 11 is sequentially introduced into the denitrification device 12, air preheater 13, dust collector 14, and absorption tower 16 by the induced draft fan 15. After that, the nitrogen oxides in the flue gas are removed by the denitrification device 12, and the flue gas enters the air preheater 13, where the waste heat of the high-temperature flue gas heats the air required for combustion, improving combustion efficiency and reducing exhaust heat loss. The flue gas continues to flow into the dust collector 14 to remove dust from the flue gas, and finally enters the absorption tower 16. After the flue gas enters the absorption tower 16, sulfur dioxide is removed from the flue gas. The flue gas generated by the two boilers 11 is connected by the conveying device 2, and the fixing device 4 fixes the conveying device 2. The working process of the denitrification device 12, air preheater 13, dust collector 14, induced draft fan 15 and absorption tower 16 is well known to those skilled in the art, and the specific models are not described here.

[0029] Furthermore, the conveying device 2 includes a first flue 21, a first electric valve 22, a second flue 23, a connecting flue 24, and a connecting device 25. Two first flues 21 are provided, each connected to the output end of one of the two induced draft fans 15. The first electric valve 22 is connected to the top of the first flue 21 near the induced draft fan 15. The second flue 23 is connected to the end of the first electric valve 22 away from the first flue 21. The connecting flue 24 is connected to the ends of the two second flues 23 away from the first electric valve 22. The connecting device 25 is located between the second flues 23 and the connecting flue 24. The flue gas drawn from the induced draft fan 15 is introduced into the absorption tower 16 through the first flue 21. The flow direction of the flue gas inside the two first flues 21 is controlled by the first electric valve 22, the second flue 23, and the connecting flue 24. The connecting device 25 connects the second flue 23 and the connecting flue 24.

[0030] In the specific implementation process, it is worth noting that when one of the absorption towers 16 fails, or when the flue gas generated by the two boilers 11 only needs to pass through one absorption tower 16 to complete the work, the first electric valve 22 can be opened. The flue gas introduced by the induced draft fan 15 can then enter the connecting flue 24 through the first electric valve 22, and be transmitted to the other first flue 21 through the connecting flue 24 and the second flue 23. Finally, it is transmitted to the absorption tower 16 through the first flue 21, ensuring that when one of the absorption towers 16 fails, the flue gas generated by the boiler 11 on this side can still be absorbed by the absorption tower 16 as usual. The model of the first electric valve 22 is Z941H-16C.

[0031] Furthermore, the connecting device 25 includes a connecting ring 251, a connecting cylinder 252, a connecting sleeve 253, and a fixing ring 254. The connecting ring 251 is fixedly connected to the outer wall of the second flue 23. Two connecting cylinders 252 are provided and fixedly connected to the outer walls of both ends of the connecting flue 24, respectively. The connecting sleeve 253 is fixedly connected to the outer wall of the connecting cylinder 252 and fits against the top of the connecting ring 251. The fixing ring 254 is threadedly connected to the outer walls of the connecting ring 251 and the connecting sleeve 253. The connecting cylinder 252 is inserted into the inner wall of the connecting ring 251, and the fixing ring 254 moves on the connecting ring 251 and the connecting sleeve 253 to connect the connecting flue 24 and the second flue 23.

[0032] In the specific implementation process, it is worth noting that when it is necessary to connect the connecting flue 24 and the second flue 23, the personnel move the connecting flue 24 downwards. The top of the connecting ring 251 has an annular sealing groove. When the connecting flue 24 moves downwards, the connecting cylinder 252 can be inserted into the inner wall of the annular sealing groove at the top of the connecting ring 251. When the connecting cylinder 252 is inserted into the inner wall of the connecting ring 251, the bottom of the connecting flue 24 and the top of the second flue 23 are in contact, and the bottom of the connecting sleeve 253 is in contact with the top of the connecting ring 251. Then, the personnel move the fixing ring 254 upwards until it is fitted onto the outer wall of the connecting ring 251 and the connecting sleeve 253, thus fixing them together. When it is necessary to disassemble the connecting flue 24... At 4 o'clock, the fixing ring 254 can be moved downward to facilitate the disassembly of the connecting flue 24. The outer wall of the connecting cylinder 252 is provided with a sealing gasket. When it is inserted into the inner wall of the connecting ring 251, the sealing gasket ensures the sealing between the connecting flue 24 and the second flue 23. The outer walls of the connecting ring 251 and the connecting sleeve 253 are both threaded. When the connecting sleeve 253 is in contact with the connecting ring 251, the threads of the two are better connected, ensuring that the fixing ring 254 can be effectively threadedly connected on the connecting ring 251 and the connecting sleeve 253. The materials of the first flue 21, the second flue 23, the connecting flue 24, the connecting ring 251, the connecting cylinder 252, the connecting sleeve 253 and the fixing ring 254 are all made of high temperature resistant alloy.

[0033] Furthermore, an elastic sealing ring 3 is fixedly connected to the top of the second flue 23;

[0034] In the specific implementation process, it is worth noting that when the bottom of the connecting flue 24 and the top of the second flue 23 are in contact, the elastic sealing ring 3 at the top of the second flue 23 will be inserted into the inner wall of the annular sealing groove opened on the end face of the connecting flue 24. The elastic sealing ring 3 is made of high temperature resistant rubber and is trapezoidal, which produces a good sealing effect and prevents flue gas leakage.

[0035] Example 2: From Figure 1-7It is known that the fixing device 4 includes a mounting component 41, a fixing strip 42, a mounting plate 43, and a fixing rod 44. The mounting component 41 is fixedly connected to the outer wall of the fixing ring 254; the fixing strip 42 is rotatably connected to the inner wall of the mounting component 41 via a pin; the mounting plate 43 is fixedly connected to the outer wall of the connecting cylinder 252; and the fixing rod 44 is inserted into the inner wall of the mounting plate 43. The fixing strip 42 rotates on the inner wall of the mounting component 41, so that the fixing strip 42 is placed on the inner wall of the mounting plate 43, and the fixing rod 44 fixes the fixing strip 42 and the mounting plate 43.

[0036] In the specific implementation process, it is worth noting that after the fixing ring 254 is rotated to the appropriate position, the personnel rotate the fixing strip 42 on the inner wall of the mounting part 41 so that it rotates to the inner wall of the mounting plate 43. Then, the fixing strip 42 and the mounting plate 43 are fixed by the fixing rod 44 to prevent the fixing ring 254 from moving due to vibration generated when the thermal power plant equipment is operating. The fixing strip 42 has a hole on its front side, and the fixing rod 44 is inserted into the inner wall of the hole. The outer wall of the fixing rod 44 is provided with a rubber sealing sleeve to increase the friction between it and the hole. Without external force, the fixing rod 44 will not fall off the inner wall of the hole. Through the setting of the threads on the outer wall of the connecting ring 251 and the connecting sleeve 253, and the setting of the position of the fixing ring 24, when the fixing ring 24 is rotated to cover the connecting ring 251 and the connecting sleeve 253, the fixing strip 42 can just rotate to the inner wall of the mounting plate 43.

[0037] Furthermore, a second electric valve 5 is connected between the first flue 21 and the absorption tower 16;

[0038] In the specific implementation process, it is worth noting that when one of the absorption towers 16 malfunctions, it is necessary to open the two first electric valves 22 and close the second electric valve 5 on the side of the malfunctioning absorption tower 16. The flue gas can then flow into the other absorption tower 16 through the connecting flue 24. The model of the second electric valve 5 is J941H-25C.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flue gas connection device for a thermal power plant, comprising a base plate (1), characterized in that: Boilers (11) are fixedly connected to the top of the base plate (1) at both the front and back. The flue gas outlet of the boiler (11) is connected to a denitrification device (12). The flue gas outlet of the denitrification device (12) is connected to an air preheater (13). The flue gas outlet of the air preheater (13) is connected to a dust collector (14). The flue gas outlet of the dust collector (14) is connected to an induced draft fan (15). An absorption tower (16) is installed outside the induced draft fan (15). The denitrification device (12), air preheater (13), dust collector (14), and induced draft fan (15) are all fixedly connected to the top of the base plate (1). The power plant flue gas connection device also includes: A conveying device (2) is disposed between the induced draft fan (15) and the absorption tower (16); A fixing device (4) is disposed on the wall surface of the conveying device (2); The induced draft fan (15) provides power to sequentially introduce the flue gas generated by the combustion of the boiler (11) into the denitrification device (12), air preheater (13), dust collector (14), and absorption tower (16), and finally discharges it into the atmosphere through the chimney. The flue gas generated by the two boilers (11) is connected by the conveying device (2), and the fixing device (4) fixes the conveying device (2).

2. A flue gas connection device for a fossil fuel power plant according to claim 1, characterized in that: The conveying device (2) includes: Two first flues (21) are provided, each connected to the output end of one of the two induced draft fans (15); The first electric valve (22) is connected to the top of the first flue (21) on the side near the induced draft fan (15); The second flue (23) is connected to the end of the first electric valve (22) away from the first flue (21); Connecting flue (24), which connects to the end of the two second flues (23) away from the first electric valve (22); A connecting device (25) is disposed between the second flue (23) and the connecting flue (24); The flue gas drawn by the induced draft fan (15) is introduced into the absorption tower (16) through the first flue (21). The flow direction of the flue gas inside the two first flues (21) is controlled by the first electric valve (22), the second flue (23) and the connecting flue (24). The connecting device (25) connects the second flue (23) and the connecting flue (24).

3. A flue gas connection device for a fossil fuel power plant according to claim 2, characterized in that: The connecting device (25) includes: A connecting ring (251) is fixedly connected to the outer wall of the second flue (23); Two connecting cylinders (252) are provided and are respectively fixedly connected to the outer walls of both ends of the connecting flue (24); The connecting sleeve (253) is fixedly connected to the outer wall of the connecting cylinder (252) and fits against the top of the connecting ring (251); A retaining ring (254) is threadedly connected to the outer wall of the connecting ring (251) and the connecting sleeve (253); The connecting cylinder (252) is inserted into the inner wall of the connecting ring (251), and the fixing ring (254) moves on the connecting ring (251) and the connecting sleeve (253) to connect the connecting flue (24) and the second flue (23).

4. A flue gas connection device for a fossil fuel power plant according to claim 3, characterized in that: An elastic sealing ring (3) is fixedly connected to the top of the second flue (23).

5. A flue gas connection device for a fossil fuel power plant according to claim 3, characterized in that: The fixing device (4) includes: Mounting component (41) is fixedly connected to the outer wall of the fixing ring (254); The fixing strip (42) is rotatably connected to the inner wall of the mounting component (41) by a pin; Mounting plate (43) is fixedly connected to the outer wall of the connecting cylinder (252); A fixing rod (44) is inserted into the inner wall of the mounting plate (43); The fixing strip (42) rotates on the inner wall of the mounting component (41) so that the fixing strip (42) is placed on the inner wall of the mounting plate (43), and the fixing rod (44) fixes the fixing strip (42) and the mounting plate (43).

6. A flue gas connection device for a thermal power plant according to claim 2, characterized in that: A second electric valve (5) is connected between the first flue (21) and the absorption tower (16).

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