Flap valve device for accurately controlling pressure in coke oven

Abstract

The utility model relates to a flap valve device for accurately controlling the pressure in a coke oven, and belongs to the technical field of mechanical structures of coke oven equipment. According to the technical scheme, three flap valves and a connecting rod mechanism (3) are arranged in a barrel (1), a first side flap valve (21) and a second side flap valve (23) are arranged on the two sides of a middle flap valve (22) respectively, every two adjacent flap valves are connected through the connecting rod mechanism, and flap plates of the flap valves are hinged to the connecting rod mechanism; a stepping motor (4) is installed on the outer surface of the cylinder body, an output shaft of the stepping motor is connected with the middle flap valve, power is output through the stepping motor, and a connecting rod mechanism acts cooperatively to control the three flap valves to be adjusted to be opened and closed. According to the utility model, the stepping motor is adopted as a power source, and the flap valve structure is combined, so that the pressure of each coke oven ascension pipe is accurately regulated and controlled, the positive pressure in the oven is kept in a reasonable range, the pressure change requirements of each coking stage are met, and the problems of smoking, air backflow and the like caused by abnormal pressure are avoided.

Description

Technical Field

[0001] This utility model relates to a flap valve device for precise control of pressure inside a coke oven, which is particularly suitable for fully utilizing the heat inside the oven and for stabilizing the pressure inside the oven under complex operating conditions. It belongs to the field of mechanical structure technology of coke oven equipment. Background Technology

[0002] In coke oven production, precise control of internal pressure, efficient utilization of heat, and addressing coking issues are key challenges. The coke oven interior maintains a slightly positive pressure that varies with the coking stage, and existing carbonization chamber pressure control methods have shortcomings. On the one hand, some control methods are costly, requiring the purchase of complex equipment and high-precision sensors, increasing operating costs that many companies cannot afford. On the other hand, even with high investment, it is still difficult to accurately control the pressure in the riser pipe of each coke oven, leading to unstable internal pressure.

[0003] Uncontrolled pressure can cause significant harm. Excessive pressure leads to smoke and environmental pollution, failing to meet environmental standards; insufficient pressure causes air backflow, triggering adverse chemical reactions, accelerating the erosion of the furnace's refractory materials, shortening the coke oven's lifespan, increasing maintenance and replacement costs, and affecting coke yield and quality, thus reducing the company's economic benefits and competitiveness. Furthermore, insufficient heat recovery from the high-temperature gases inside the furnace wastes energy; severe coking can easily lead to glue and coke buildup on the equipment, interfering with production; and some existing control devices are complex in structure, costly, and difficult to maintain, failing to meet production needs. Utility Model Content

[0004] The purpose of this invention is to provide a flap valve device for precise control of pressure inside a coke oven. It precisely drives the flap opening through mechanical transmission, has a simple structure, reduces raw material and manufacturing costs, and ensures system stability and reliability, thus solving the problems existing in the background technology.

[0005] The technical solution of this utility model is:

[0006] A precise pressure control device for a coke oven includes a cylinder, flap valves, a linkage mechanism, and a stepper motor. The cylinder contains three flap valves: a first side flap valve, a middle flap valve, and a second side flap valve. The first and second side flap valves are located on either side of the middle flap valve. Adjacent flap valves are connected by a linkage mechanism, and the flaps of the flap valves are hinged to the linkage mechanism. A stepper motor is mounted on the outer surface of the cylinder. The output shaft of the stepper motor is connected to the middle flap valve. Power is output from the stepper motor, and the linkage mechanism works in tandem to control the opening and closing of the three flap valves.

[0007] The first side flap valve consists of a first side flap and a first side valve shaft, with the first side flap fixedly mounted on the first side valve shaft; the second middle flap valve consists of a second middle flap and a second middle valve shaft, with the second middle flap fixedly mounted on the second middle valve shaft; the second side flap valve consists of a second side flap and a second side valve shaft, with the second side flap fixedly mounted on the second side valve shaft; the first side flap, the second middle flap, and the second side flap are respectively hinged to the linkage mechanism; both ends of the first side valve shaft, the second middle valve shaft, and the second side valve shaft are all mounted on the cylinder and rotatably connected to the cylinder; the second middle valve shaft is connected to the output shaft of the stepper motor.

[0008] An overflow box is also provided on the outer surface of the cylinder.

[0009] The overflow box is provided with an inner overflow port and an inner overflow port. The overflow box is connected to the cylinder body through the inner overflow port and the inner overflow port. The inner overflow port is located above the inner overflow port.

[0010] A vertical partition is installed inside the overflow box. The top and sides of the partition are fixedly connected to the inner wall of the overflow box. A gap is provided between the bottom of the partition and the bottom of the overflow box. The overflow box is divided into a connected left overflow box and a right overflow box by the partition. The overflow outlet in the cylinder and the overflow outlet in the box are respectively located on the left overflow box and the right overflow box. The overflow outlet in the cylinder and the overflow outlet in the box are respectively located above and below the closed position of the flap valve. The overflow box contains ammonia water. The height of the ammonia water in the overflow box is the overflow box water level. The overflow box water level is greater than the height of the gap.

[0011] A motor mounting base is provided on the outer surface of the cylinder, and the stepper motor is mounted on the outer surface of the cylinder through the motor mounting base.

[0012] Each of the three flap valves (side flap one, middle flap, and side flap two) is equipped with a sealing ring between itself and the cylinder body; when the three flap valves are closed, the sealing rings greatly improve the sealing performance of the structure.

[0013] The space between the stepper motor and the cylinder is filled with heat-insulating filler, which is a heat-insulating material such as rock wool. Rock wool has good heat insulation performance, which can effectively block heat transfer, prevent the motor from being damaged by excessive ambient heat, ensure the normal operation and service life of the stepper motor, and further improve the stability and reliability of the entire system.

[0014] There are two linkage mechanisms, namely linkage mechanism one and linkage mechanism two. The side flap valve one and the middle flap valve are connected by linkage mechanism one, and the middle flap valve and the side flap valve two are connected by linkage mechanism two. Linkage mechanism two and linkage mechanism one are respectively located on the upper and lower sides of the middle flap valve. The two ends of linkage mechanism one are hinged to the side flap valve one and the middle flap valve respectively, and the two ends of linkage mechanism two are hinged to the middle flap valve and the side flap valve two respectively.

[0015] A latent heat exchanger is installed above the cylinder, inside the riser pipe. Above the latent heat exchanger is a ring-shaped spray cleaning device connected to a hot ammonia storage device. Hot ammonia is used as the cleaning fluid, as it has good solubility for adhesives. Multiple fine nozzles are evenly arranged on the ring-shaped spray cleaning device. The hot ammonia sprayed from these nozzles cleans the inner wall of the riser pipe and the surface of the flapper. The cleaned ammonia flows above the flapper to form a water seal, further preventing backflow of gas from the gas collecting pipe and ensuring that the equipment surface is free of tar and coke, thus ensuring smooth flapper operation. If the ammonia level rises, an overflow box can drain excess ammonia, ensuring the effectiveness and stability of the water seal and achieving reasonable ammonia recovery and reuse.

[0016] A pressure sensor is installed at one end of the riser pipe near the furnace body. The pressure sensor can quickly and accurately detect changes in pressure inside the furnace and convert these changes into mechanical displacement signals, which are then transmitted to this invention. Even under complex conditions of severe coking and large temperature differences, the furnace can maintain a slightly positive pressure state through the linkage of a stepper motor, a linkage mechanism, and a flap valve, and the pressure can be adjusted reasonably according to the coking stage.

[0017] The linkage mechanism, stepper motor, latent heat generator, pressure sensor, and gas collection pipe are all devices known and commonly used in the field.

[0018] The beneficial effects of this utility model are: by using a stepper motor as a power source and combining it with a three-flap valve structure, the pressure of each coke oven riser pipe can be precisely controlled, so that the positive pressure inside the furnace is kept within a reasonable range, meeting the pressure change requirements of each stage of coking, and avoiding problems such as smoke and air backflow caused by abnormal pressure; the structure is simple, the cost is low, and it is easy to promote and apply on a large scale. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the installation position of this utility model;

[0020] Figure 2 This is a schematic diagram of the structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the flip panel in the open state of this utility model;

[0022] Figure 4 This is a top view of the flip panel of this utility model in the open state;

[0023] Figure 5 This is a bottom view of the flip panel of this utility model in the open state;

[0024] Figure 6 This is a schematic diagram of the flap in the closed state of this utility model;

[0025] Figure 7 for Figure 6 BB-direction diagram;

[0026] Figure 8 for Figure 7 A schematic diagram of direction AA;

[0027] Figure 9 This is a schematic diagram of the overflow box structure of this utility model;

[0028] In the figure: 1. Cylinder body; 2. This utility model; 3. Side flap valve 1; 4. Side flap 1; 5. Side valve shaft 1; 6. Middle flap valve; 7. Middle flap 2; 8. Middle valve shaft 2; 9. Middle flap valve; 10. Middle valve shaft 2; 11. Middle flap 2; 12. Middle valve shaft 2; 12. Side flap valve 2; 13. Side flap valve 2; 14. Sealing ring; 15. Linkage mechanism; 16. Linkage mechanism 1; 17. Linkage mechanism 2; 18. Stepper motor; 19. Overflow box; 20. Cylinder overflow port; 21. Box overflow port; 22. Overflow box water level; 23. Partition plate; 24. Ammonia water level inside the cylinder; 25. Flap valve closed position; 26. Gap; 27. Motor mounting base; 28. Heat insulation packing; 29. ​​Ascending pipe; 20. Latent heat exchanger; 20. Annular spray cleaning device; 21. Pressure sensor; 22. Gas collection pipe; 23. Walkway platform. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and examples.

[0030] A precise pressure control flap valve device for a coke oven includes a cylinder 1, flap valves, a linkage mechanism 3, and a stepper motor 4. The cylinder 1 is equipped with flap valves and the linkage mechanism 3. There are three flap valves: a first side flap valve 21, a middle flap valve 22, and a second side flap valve 23. The first side flap valve 21 and the second side flap valve 23 are respectively located on both sides of the middle flap valve 22. Adjacent flap valves are connected by the linkage mechanism 3, and the flaps of the flap valves are hinged to the linkage mechanism 3. The stepper motor 4 is installed on the outer surface of the cylinder 1. The output shaft of the stepper motor 4 is connected to the middle flap valve 22. Power is output by the stepper motor 4, and the linkage mechanism 3 works in coordination to control the opening and closing of the three flap valves.

[0031] The first side flap valve 21 is composed of a first side flap 211 and a first side valve shaft 212, with the first side flap 211 fixedly mounted on the first side valve shaft 212; the second middle flap valve 22 is composed of a second middle flap 221 and a second middle valve shaft 222, with the second middle flap 221 fixedly mounted on the second middle valve shaft 222; the third side flap valve 23 is composed of a second side flap 231 and a second side valve shaft 232, with the second side flap 231 fixedly mounted on the second side valve shaft 232; the first side flap 211, the second middle flap 221, and the second side flap 231 are respectively hinged to the linkage mechanism 3; both ends of the first side valve shaft 212, the second middle valve shaft 222, and the second side valve shaft 232 are mounted on the cylinder 1 and rotatably connected to the cylinder 1; the second middle valve shaft 222 is connected to the output shaft of the stepper motor 4.

[0032] An overflow box 5 is also provided on the outer surface of the cylinder 1.

[0033] The overflow box 5 is provided with an inner overflow port 51 and an inner overflow port 52. The overflow box 5 is connected to the cylinder 1 through the inner overflow port 51 and the inner overflow port 52. The inner overflow port 51 is located above the inner overflow port 52.

[0034] A partition 54 is vertically installed inside the overflow box 5. The top and both sides of the partition 54 are fixedly connected to the inner wall of the overflow box 5. A gap 57 is provided between the bottom of the partition 54 and the bottom of the overflow box. The overflow box 5 is divided into a connected left overflow box and a right overflow box by the partition 54. The overflow port 51 in the cylinder and the overflow port 52 in the box are respectively provided on the left overflow box and the right overflow box. The overflow port 51 in the cylinder and the overflow port 52 in the box are respectively located above and below the closed position 56 of the flap valve. The overflow box contains ammonia water. The height of the ammonia water in the overflow box is the overflow box water level 53. The overflow box water level 53 is greater than the height of the gap 57. When the three flap valves are closed, a sealed valve is formed, allowing the ammonia water level inside the cylinder to rise. A certain water seal level is maintained above the flap valves inside the cylinder, which is the ammonia water level 55. When the ammonia water level inside the cylinder reaches the overflow port 51, the excess ammonia water enters the overflow box 5 through the overflow port 51, ensuring that the ammonia water level 55 is always level with the bottom of the overflow port 51, guaranteeing a stable ammonia water level and achieving a complete seal of the channel by the flap valves. When the ammonia water in the overflow box increases, the ammonia water in the lower part of the overflow box enters the right overflow box through the gap 57 from the left overflow box. When the water level 53 in the overflow box is higher than the overflow port 52, the ammonia water flows out through the overflow port 52 and enters the cylinder below the closed position 56 of the flap valve, maintaining the water level 53 in the overflow box level with the bottom of the overflow port 52. The ammonia water then enters the gas collecting pipe through the cylinder, thus achieving reasonable recovery and utilization of ammonia water. The overflow box will also store a certain water level, which submerges the lower part of the partition, thus playing a sealing role. When the flap is opened, the ammonia water seal liquid level in the overflow box can prevent the raw coal gas from entering the overflow port 52 of the box from the overflow port 51 inside the cylinder, and prevent the raw coal gas from passing through the overflow box, thereby interfering with the flap's regulation of the raw coal gas flow.

[0035] A motor mounting base 6 is provided on the outer surface of the cylinder 1, and the stepper motor 4 is mounted on the outer surface of the cylinder 1 through the motor mounting base 6.

[0036] Each of the three flap valves, including the first side flap 211, the middle flap 221, and the second side flap 231, is equipped with a sealing ring 24 between itself and the cylinder 1. When the three flap valves are closed, the sealing rings greatly improve the sealing performance of the structure. This sealing performance allows the ammonia water injected above the flaps to form a water seal more effectively, preventing gas backflow into the gas collection pipe 12 below the walkway platform 13.

[0037] The stepper motor 4 and the cylinder 1 are filled with heat insulation filler 7, which is a heat insulation material such as rock wool. Rock wool has good heat insulation performance, which can effectively block heat transfer, prevent the motor from being damaged due to excessive ambient heat, ensure the normal operation and service life of the stepper motor, and further improve the stability and reliability of the entire system.

[0038] A gap is provided between the motor mounting base 6 and the cylinder 1, and the gap is filled with heat insulation filler 7.

[0039] There are two linkage mechanisms 3, namely linkage mechanism one 31 and linkage mechanism two 32. The side flap valve one 21 and the middle flap valve 22 are connected by linkage mechanism one 31, and the middle flap valve 22 and the side flap valve two 23 are connected by linkage mechanism two 32. Linkage mechanism two 32 and linkage mechanism one 31 are respectively located on the upper and lower sides of the middle flap valve 22. The two ends of linkage mechanism one 31 are hinged to the side flap valve one 211 and the middle flap valve 221 respectively, and the two ends of linkage mechanism two 32 are hinged to the middle flap valve 221 and the side flap valve two 231 respectively.

[0040] A latent heat exchanger 9 is installed above the cylinder 1. An annular spray cleaning device 10 is located above the latent heat exchanger 9 inside the riser pipe 8. This annular spray cleaning device is connected to a hot ammonia water storage device, using hot ammonia water as the cleaning fluid, which has good solubility for adhesives. Multiple fine nozzles are evenly distributed on the annular spray cleaning device. The hot ammonia water sprayed from these nozzles cleans the inner wall of the riser pipe and the surface of the flapper. The cleaned ammonia water flows above the flapper to form a water seal, further preventing backflow of gas from the gas collecting pipe and ensuring that the equipment surface is free of tar and coke, thus ensuring flexible flapper operation. If the ammonia water level rises, an overflow box can drain excess ammonia water, ensuring the effectiveness and stability of the water seal and achieving reasonable recycling of ammonia water.

[0041] A pressure sensor 11 is installed at one end of the riser pipe 8 near the furnace body. The pressure sensor 11 can quickly and accurately sense changes in the pressure inside the furnace and convert these changes into mechanical displacement signals, which are then transmitted to this invention. Even under complex conditions of severe coking and large temperature differences, the furnace can maintain a slightly positive pressure state through the linkage of the stepper motor, linkage mechanism, and flap valve, and the pressure can be adjusted reasonably according to the coking stage.

[0042] This invention uses a stepper motor as the transmission mechanism to provide power, driving three flaps through two sets of linkage mechanisms. The stepper motor can precisely control the output power, working in conjunction with the two sets of linkage mechanisms to precisely adjust the opening of the three flaps through simple mechanical transmission. The linkage mechanism and the flaps are hinged together by simple rod-shaped components, eliminating complex electronic components and cumbersome transmission mechanisms, reducing raw material and manufacturing costs while ensuring system stability and reliability. By adjusting the flap opening, this invention can control the furnace pressure and ensure full contact between the flue gas and the heat exchange structure. The heat exchange structure adopts a compact design with a large heat exchange area and good thermal conductivity, which can fully recover the heat from the flue gas and preheat the cold air or other media entering the system, improving energy utilization efficiency and reducing energy waste.

[0043] The pressure sensor is installed at a suitable position near the furnace body on the coke oven riser pipe to ensure accurate sensing of the furnace pressure. According to design requirements, the stepper motor, two sets of linkage mechanisms, and three flaps are assembled, ensuring a secure connection between the stepper motor and the linkage mechanisms, and between the linkage mechanisms and the opening and closing components of the flaps. Simultaneously, sealing rings are installed to ensure the structure's airtightness. Considering the high-temperature environment inside the furnace, filler such as rock wool is placed between the motor and the cylinder to provide insulation and protect the motor for normal operation.

[0044] Advantages of this utility model:

[0045] 1. Precise pressure control: Using a stepper motor as the power source, combined with a unique three-flap valve structure, it can achieve precise control of the pressure of each coke oven riser pipe, keep the positive pressure in the furnace within a reasonable range, meet the pressure change requirements of each stage of coking, and avoid problems such as smoke and air backflow caused by abnormal pressure. It is highly efficient and environmentally friendly.

[0046] 2. Anti-coking and equipment maintenance: The cleaning structure works in conjunction with the flap valve to clean the equipment regularly, solving the problems of glue accumulation and coking, ensuring normal equipment operation, reducing maintenance costs, and using hot ammonia water to form a water seal and recycle it in a reasonable way to optimize resource utilization;

[0047] 3. Simple structure and low cost: It adopts a simple and reliable linkage mechanism and flap mechanical structure, which is simple, stable and reliable, and has a low cost, making it easy to promote and apply on a large scale. The sealing ring enhances the sealing performance of the structure.

[0048] 4. System stability assurance: The rationally designed water seal and ammonia overflow structure ensure a stable ammonia level during system operation, guaranteeing normal system operation;

[0049] 5. Precise power control: The stepper motor provides power, which can precisely control the flap movement, improving the accuracy and reliability of the pressure regulation of the entire system;

[0050] 6. Effective motor protection: Rock wool insulation is filled between the motor and the cylinder, effectively protecting the motor from high-temperature environments, extending the motor's service life, and ensuring stable system operation;

[0051] 7. Excellent sealing performance: The sealing rings installed when the three flap valves are closed significantly improve the structural sealing performance, help to form a stable water seal, and effectively prevent gas backflow in the gas collection pipe.

Claims

1. A flap valve device for precise control of pressure inside a coke oven, characterized in that: The device includes a cylinder (1), a flap valve, a linkage mechanism (3), and a stepper motor (4). The cylinder (1) is equipped with a flap valve and a linkage mechanism (3). There are three flap valves: a side flap valve one (21), a middle flap valve (22), and a side flap valve two (23). The side flap valve one (21) and the side flap valve two (23) are respectively located on both sides of the middle flap valve (22). The two adjacent flap valves are connected by the linkage mechanism (3), and the flap of the flap valve is hinged to the linkage mechanism (3). The stepper motor (4) is installed on the outer surface of the cylinder (1). The output shaft of the stepper motor (4) is connected to the middle flap valve (22). The stepper motor (4) outputs power, and the linkage mechanism (3) works in coordination to control the opening and closing of the three flap valves.

2. The coke oven pressure precision control flap valve device according to claim 1, characterized in that: The first side flap valve (21) consists of a first side flap (211) and a first side valve shaft (212), with the first side flap (211) fixedly mounted on the first side valve shaft (212); the second middle flap valve (22) consists of a second middle flap (221) and a second middle valve shaft (222), with the second middle flap (221) fixedly mounted on the second middle valve shaft (222); the third side flap valve (23) consists of a second side flap (231) and a second side valve shaft (232). Side flap 2 (231) is fixedly mounted on side valve shaft 2 (232); side flap 1 (211), middle flap 2 (221) and side flap 2 (231) are respectively hinged to the linkage mechanism (3); both ends of side valve shaft 1 (212), middle valve shaft (222) and side valve shaft 2 (232) are mounted on the cylinder (1) and rotatably connected to the cylinder (1); middle valve shaft (222) is connected to the output shaft of stepper motor (4).

3. A flap valve device for precise control of pressure inside a coke oven according to claim 1 or 2, characterized in that: The outer surface of the cylinder (1) is also provided with an overflow box (5).

4. The coke oven pressure precision control flap valve device according to claim 3, characterized in that: The overflow box (5) is provided with an inner overflow port (51) and an inner overflow port (52). The overflow box (5) is connected to the cylinder (1) through the inner overflow port (51) and the inner overflow port (52). The inner overflow port (51) is located above the inner overflow port (52).

5. The coke oven pressure precision control flap valve device according to claim 4, characterized in that: The overflow box (5) is vertically equipped with a partition (54). The top and sides of the partition (54) are fixedly connected to the inner wall of the overflow box (5). A gap (57) is provided between the bottom of the partition (54) and the bottom of the overflow box. The overflow box (5) is divided into a connected left overflow box and a right overflow box by the partition (54). The overflow port (51) in the cylinder and the overflow port (52) in the box are respectively provided on the left overflow box and the right overflow box. The overflow port (51) in the cylinder and the overflow port (52) in the box are respectively provided above and below the closed position (56) of the flap valve. The overflow box is filled with ammonia water. The height of the ammonia water in the overflow box is the overflow box water level (53). The overflow box water level (53) is greater than the height of the gap (57).

6. A flap valve device for precise control of pressure inside a coke oven according to claim 1 or 2, characterized in that: A motor mounting base (6) is provided on the outer surface of the cylinder (1), and the stepper motor (4) is mounted on the outer surface of the cylinder (1) through the motor mounting base (6).

7. The coke oven pressure precision control flap valve device according to claim 2, characterized in that: The first side flap (211), the middle flap (221) and the second side flap (231) are all provided with sealing rings (24) between themselves and the cylinder (1).

8. A flap valve device for precise control of pressure inside a coke oven according to claim 1 or 2, characterized in that: The stepper motor (4) and the cylinder (1) are filled with heat-insulating filler (7).

9. The coke oven pressure precision control flap valve device according to claim 7, characterized in that: There are two linkage mechanisms (3), namely linkage mechanism one (31) and linkage mechanism two (32). The side flap valve one (21) and the middle flap valve (22) are connected by linkage mechanism one (31), and the middle flap valve (22) and the side flap valve two (23) are connected by linkage mechanism two (32). Linkage mechanism two (32) and linkage mechanism one (31) are respectively set on the upper and lower sides of the middle flap valve (22). The two ends of linkage mechanism one (31) are respectively hinged to the side flap valve one (211) and the middle flap valve (221), and the two ends of linkage mechanism two (32) are respectively hinged to the middle flap valve (221) and the side flap valve two (231).

10. A flap valve device for precise control of pressure inside a coke oven according to claim 1 or 2, characterized in that: A latent heat generator (9) is installed above the cylinder (1). The latent heat generator (9) is located inside the riser pipe (8). An annular spray cleaning device (10) is installed above the latent heat generator (9). The annular spray cleaning device is connected to the hot ammonia water storage device.

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