A double-drive and double-sealing device for the flue gas at the tail of a cement kiln and its control method

Abstract

The present invention belongs to the technical field of flue gas pipeline sealing, and provides a double-drive and double-sealing device for the flue gas at the tail of a cement kiln, which is used to control the flue gas emission at the tail of a cement rotary kiln. The device includes: a housing, a valve plate, a valve plate mounting seat and a driving mechanism. The valve plate mounting seat is arranged inside the housing. The number of the valve plates is 2 and is used to seal the flue gas. One side of each valve plate is rotatably connected to the corresponding side of the valve plate mounting seat. A valve retainer ring is arranged inside the housing, and flexible graphite is arranged on the valve retainer ring. In the closed state of the housing, the flexible graphite contacts the valve plate. The number of the driving mechanisms is 2, and the driving mechanisms are used to drive the valve plates to turn over. The present invention uses flexible graphite to fill the gap between the valve plate and the valve retainer ring to ensure the sealing performance.

Description

Technical Field

[0001] The invention belongs to the technical field of flue gas pipeline sealing, and particularly relates to a double-drive double-sealing device for cement kiln tail flue gas and a control method thereof. Background Art

[0002] Cement production mainly relies on a rotary kiln (cement kiln). Specifically, raw material powder is fed into the kiln cylinder from the high end of the kiln tail barrel. Due to the slow rotation of the inclined kiln cylinder, the material generates a combined movement of rolling along the circumference and moving from high temperature to low temperature along the axis. The raw materials are decomposed and fired in the kiln. The soot generated during the cement firing process is discharged through the flue at the cement kiln tail. A flue valve (sealing device) is provided in the flue, and the flue valve can effectively cut off the flue, cold air, combustion air, combustion gas and other pipelines. When the hot blast stove burns, the flue valve is opened to allow the waste gas to be discharged through the flue; when the hot blast stove supplies air, the flue valve is closed to cut off the passage of the flue.

[0003] Existing flue valves generally use butterfly valves. In the closed state, the butterfly valve is in close contact with the valve retaining ring on the inner wall of the flue to close the flue and seal the cement kiln tail. During use, due to the excessively high temperature of the flue gas and the impact of the flue gas on the valve plate, it is easy to cause slight deformation of the valve plate. After the edge of the valve plate fits with the valve retaining ring, there will still be small gaps, resulting in smoke leakage.

[0004] Therefore, we provide a double-drive double-sealing device for cement kiln tail flue gas and a control method thereof.

[0005] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0006] The invention provides a double-drive double-sealing device for cement kiln tail flue gas and a control method thereof, aiming to solve the problem that there are still small gaps after the edge of the valve plate fits with the valve retaining ring, resulting in smoke leakage.

[0007] The invention is implemented as follows. A double-drive double-sealing device for cement kiln tail flue gas is used to control the flue gas emission at the tail of a cement rotary kiln, and includes: a housing, a valve plate, a valve plate mounting seat and a driving mechanism. The valve plate mounting seat is arranged inside the housing. The number of the valve plates is 2 and is used to seal the flue gas. One side of each valve plate is rotatably connected to the corresponding side of the valve plate mounting seat. A valve retaining ring is arranged inside the housing, and flexible graphite is arranged on the valve retaining ring. In the closed state of the housing, the flexible graphite contacts the valve plate. The number of the driving mechanisms is 2, and the driving mechanisms are used to drive the valve plate to flip.

[0008] Optionally, a filling bladder is provided on the flexible graphite. The interior of the filling bladder is filled with a fluid. The filling bladder is connected to a water inlet pipe and a water outlet pipe. A pressure valve is provided on the water outlet pipe, and a check valve is provided on the water inlet pipe. The valve plate is semi-circular and has an arc-shaped edge. A limiting portion is provided at the arc-shaped edge of the valve plate. The cross-section of the limiting portion is L-shaped. A storage bladder groove is formed between the limiting portion and the valve plate. In the closed state of the housing, the filling bladder contacts the arc-shaped edge of the valve plate.

[0009] Optionally, in the closed state of the valve plate, the edge of the valve plate extends towards the inner wall of the housing perpendicular to the valve retainer ring. The arm portion of the limiting portion parallel to the edge of the valve plate is disposed opposite to the valve retainer ring, and a slit is formed between the arm portion and the valve retainer ring. The extension length P of the edge is greater than the extension length Q of the arm portion.

[0010] Optionally, the fluid filled in the interior of the filling bladder is water. In the closed state of the valve plate, a space capable of squeezing the filling bladder is formed inside the storage bladder groove, and the volume of the space is smaller than the volume of the filling bladder in the non-squeezed state.

[0011] Optionally, the driving mechanism includes: a driving device, a driving rod, a transmission rod, a driven rod, a rotating shaft, a first swing arm, and a connecting rod. Among them, the rotating shaft passes through the housing and is rotatably connected to the side wall of the housing. One end of the rotating shaft is fixedly connected to the driven rod. The end of the driven rod away from the rotating shaft is hinged to the transmission rod. The end of the transmission rod away from the driven rod is hinged to one end of the driving rod. The end of the driving rod away from the transmission rod is hinged to the output end of the driving device. One end of the first swing arm is fixedly connected to the rotating shaft. The other end of the first swing arm is hinged to one end of the connecting rod. The end of the connecting rod away from the first swing arm is hinged to the surface of the valve plate.

[0012] Optionally, the number of the first swing arms is at least 2, and the number of the connecting rods corresponds to the number of the first swing arms.

[0013] Optionally, the driving device is fixedly connected to the outer wall of the housing through a mounting seat.

[0014] Optionally, the drive mechanism includes: a drive device, a drive rod, a transmission rod, a driven rod, a rotating shaft, and a second swing arm. Wherein, the rotating shaft passes through the housing and is rotatably connected to the side wall of the housing. One end of the rotating shaft is fixedly connected to the driven rod. The end of the driven rod away from the rotating shaft is hinged to the transmission rod. The end of the transmission rod away from the driven rod is hinged to one end of the drive rod. The end of the drive rod away from the transmission rod is hinged to the output end of the drive device. One end of the second swing arm is fixedly connected to the rotating shaft, and the side surface of the second swing arm is fixedly connected to the valve plate.

[0015] Optionally, the number of the second swing arms is at least 2.

[0016] The present invention also provides a control method for a double-drive and double-sealing device for cement kiln tail gas, including:

[0017] S1. Receiving an instruction to open or close the flue.

[0018] S2. When receiving an instruction to open or close the flue, controlling the drive mechanism to drive the valve plate to open or close the flue for discharging the gas.

[0019] S3. When the valve plate closes the flue, the valve plate squeezes the flexible graphite on the valve retaining ring to fill the gap between the valve plate and the valve retaining ring through the flexible graphite.

[0020] The beneficial effects achieved by the present invention. According to the double-drive and double-sealing device for cement kiln tail gas and its control method of the present invention, when the flue is closed, the valve plate and the valve retaining ring face each other, and the flexible graphite is squeezed. Since the flexible graphite is soft, after being squeezed, the flexible graphite can fill the gap between the valve plate and the valve retaining ring to ensure the sealing performance. It solves the problem that there are still small gaps after the edge of the valve plate fits with the valve retaining ring, resulting in smoke leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings. The drawings do not constitute a proportional limitation, and among them:

[0022] Figure 1 is the overall structural schematic diagram of the double-drive and double-sealing device for cement kiln tail gas provided by the present invention;

[0023] Figure 2 is the internal structural schematic diagram of the housing of the double-drive and double-sealing device for cement kiln tail gas provided by the present invention;

[0024] Figure 3 It is a schematic front sectional view structure of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention;

[0025] Figure 4 It is a schematic front sectional view structure of the double-drive double-sealing device for the flue gas at the tail of a cement kiln in the open state provided by the present invention;

[0026] Figure 5 It is a schematic view of the structure at the valve plate of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention;

[0027] Figure 6 It is a schematic view of the valve retainer and the filling bladder structure of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention;

[0028] Figure 7 It is a sectional view of the valve plate and the filling bladder fitting of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention;

[0029] Figure 8 It is a schematic view of the structure of the second embodiment of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention;

[0030] Figure 9 It is a schematic view of the structure of the third embodiment of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention;

[0031] Figure 10 is Figure 4 the enlarged schematic view at A in

[0032] Figure 11 It is a sectional view of the valve plate and the flexible graphite fitting of the double-drive double-sealing device for the flue gas at the tail of a cement kiln provided by the present invention.

[0033] The reference numerals are as follows:

[0034] 1 - housing, 11 - valve retainer, 12 - flexible graphite, 13 - graphite fixing bracket, 2 - valve plate, 21 - limiting part, 22 - storage bladder groove, 3 - valve plate mounting seat, 4 - driving mechanism, 41 - driving device, 42 - driving rod, 43 - transmission rod, 44 - driven rod, 45 - rotating shaft, 46 - first swing arm, 47 - connecting rod, 48 - mounting seat, 49 - second swing arm, 5 - filling bladder, 51 - water inlet pipe, 52 - water outlet pipe, 53 - pressure valve, 54 - check valve. Detailed implementation manners

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0036] The terms "first" and "second" etc. in the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps, operations, components or modules is not limited to the listed steps, operations, components or modules, but may optionally further include steps, operations, components or modules not listed, or may optionally further include other steps, operations, components or modules inherent to these processes, methods, products or devices.

[0037] Referring to "embodiments" herein means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0038] When the valve plate closes the flue, the valve plate squeezes the filling bladder on the valve retainer, and the filling bladder deforms to fill the gap between the valve plate and the valve retainer, solving the problem that there will be small gaps between the edge of the valve plate and the valve retainer, resulting in smoke leakage.

[0039] Embodiment 1

[0040] As Figures 1 to 11As shown, a double-drive and double-seal device for the flue gas at the tail of a cement kiln according to an exemplary embodiment is used to control the flue gas emission at the tail of a cement rotary kiln, and includes: a housing 1, a valve plate 2, a valve plate mounting seat 3, and a driving mechanism 4. The valve plate mounting seat 3 is arranged inside the housing 1. The number of the valve plates 2 is 2 and is used to seal the flue gas. One side of each valve plate 2 is rotatably connected to the corresponding side of the valve plate mounting seat 3. A valve retainer ring 11 is arranged inside the housing 1, flexible graphite 12 is arranged on the valve retainer ring 11, and a graphite fixing bracket 13 is arranged on the valve retainer ring 11. The graphite fixing bracket 13 fixes the flexible graphite 12. When the housing 1 is in a closed state, the flexible graphite 12 contacts the valve plate 2. The number of the driving mechanisms 4 is 2, and the driving mechanism 4 is used to drive the valve plate 2 to flip. The driving mechanism 4 drives the valve plate 2 to rotate relative to the valve plate mounting seat 3. When the plate surface of the valve plate 2 is perpendicular to the radial direction of the housing 1, the housing 1 is in a completely open state at this time. When the valve plate 2 is in close contact with the valve retainer ring 11, the housing 1 is in a closed state at this time, and the valve plate 2 intercepts the soot in the flue pipe. Please refer to Figure 11 , when the valve plate 2 is in close contact with the valve retainer ring 11, the flexible graphite 12 on the valve retainer ring 11 is extruded. Since the flexible graphite 12 is soft, after being extruded, the flexible graphite 12 can fill the gap between the valve plate 2 and the valve retainer ring 11 to ensure the sealing performance. It solves the problem that there are still small gaps after the edge of the valve plate fits with the valve retainer ring, resulting in the phenomenon of smoke leakage.

[0041] Among them, the main view cross-section of the housing 1 is a parallelogram, and the two valve plates 2 flip outwards relatively when flipping. At the same time, the two driving mechanisms 4 drive the two valve plates 2 respectively. Compared with the traditional electric butterfly valve, the opening and closing torque of the valve plate 2 of the double-drive and double-seal device for the flue gas at the tail of a cement kiln is smaller, so as to reduce the driving force generated by the driving mechanism 4 to drive the valve plate 2. The two valve plates 2 seal the housing 1 respectively to achieve the function of "double drive and double seal".

[0042] As an example, a filling bladder 5 is provided on the flexible graphite 12. The interior of the filling bladder 5 is filled with a fluid. The filling bladder 5 is connected to a water inlet pipe 51 and a water outlet pipe 52. A pressure valve 53 is provided on the water outlet pipe 52, and a one-way valve 54 is provided on the water inlet pipe 51. The water inlet pipe 51 is connected to a fluid source (not marked in the figure. The fluid source refers to the source of the fluid inside the filling bladder 5, which can be a water source). The water outlet pipe 52 is connected to a collection device (not marked in the figure. The collection device can be a water tank or other container for collecting the discharged fluid, which can be reused after cooling to avoid waste of resources). The water inlet pipe 51 conveys the fluid into the interior of the filling bladder 5. The one-way valve 54 can prevent the fluid inside the filling bladder 5 from flowing back through the water inlet pipe 51. When the internal pressure of the filling bladder 5 reaches the threshold of the pressure valve 53, the pressure valve 53 opens, and the fluid flows out through the water outlet pipe 52. In this way, it can be ensured that the internal pressure of the filling bladder 5 remains constant. In addition, the replacement of the fluid inside the filling bladder 5 can prevent the filling bladder 5 from bursting due to the heating of the fluid inside the filling bladder 5 by high-temperature soot. The driving mechanism 4 drives the valve plate 2 to rotate relative to the valve plate mounting seat 3. When the plate surface of the valve plate 2 is perpendicular to the radial direction of the housing 1, the housing 1 is in a completely open state at this time. When the valve plate 2 is in close contact with the valve retainer ring 11, the housing 1 is in a closed state at this time, and the valve plate 2 intercepts the soot in the smoke pipe. Please refer to Figure 7 , when the valve plate 2 is in close contact with the valve retainer ring 11, the filling bladder 5 is squeezed. The filling bladder 5 is soft, and the interior of the filling bladder 5 is filled with a fluid. Therefore, after the filling bladder 5 is squeezed, it can fill the gap between the valve plate 2 and the valve retainer ring 11 to ensure the sealing performance. It solves the problem that there will still be small gaps after the edge of the valve plate fits with the valve retainer ring, resulting in smoke leakage. The valve plate 2 is semi-circular and has an arc-shaped edge. A limiting portion 21 is provided at the arc-shaped edge of the valve plate 2. The cross-section of the limiting portion 21 is L-shaped. A storage bladder groove 22 is formed between the limiting portion 21 and the valve plate 2. In the closed state of the housing 1, the filling bladder 5 contacts the arc-shaped edge of the valve plate 2. After the filling bladder 5 is squeezed by the valve retainer ring 11 and the valve plate 2, the filling bladder 5 will fill the storage bladder groove 22. The limiting portion 21 plays a limiting role on the filling bladder 5, prompting the filling bladder 5 to wrap the inner edge of the valve retainer ring 11, further improving the filling rate of the filling bladder 5 for the gap, and further improving the sealing performance of the valve plate 2 for the housing 1.

[0043] As an example, in the closed state of the valve plate 2, the edge of the valve plate 2 extends towards the inner wall of the housing 1 that is perpendicular to the valve retainer 11. The arm portion of the limiting portion 21 that is parallel to the edge of the valve plate 2 is disposed opposite to the valve retainer 11, and a slit is formed between the arm portion and the valve retainer 11. The extending length P of the edge is greater than the extending length Q of the arm portion. After the filling bladder 5 is squeezed, due to the volume compression effect of the storage bladder groove 22 on the filling bladder 5, the filling bladder 5 will be squeezed out through the slit. By virtue of the characteristics of the fluid, it can be ensured that the filling bladder 5 fills the internal structure of the storage bladder groove 22 including the slit.

[0044] As an example, the fluid filled inside the filling bladder 5 is water. Under standard atmospheric pressure, the boiling point of water is 100 °C. The reciprocating entry and exit of water into and out of the filling bladder 5 can effectively protect the filling bladder 5 and prevent the filling bladder 5 from being damaged by the high temperature of the high-temperature flue gas. In the closed state of the valve plate 2, a space capable of squeezing the filling bladder 5 is formed inside the storage bladder groove 22, and the volume of this space is smaller than the volume of the filling bladder 5 in the non-squeezed state. This kind of structural design can ensure that the filling bladder 5 fills the storage bladder groove 22. After the filling bladder 5 fills the gap between the valve plate 2 and the valve retainer 11, it will also form a wrapped state on the inner edge of the valve retainer 11, minimizing the generation of gaps as much as possible to avoid the leakage of soot through the gaps.

[0045] As an example, the driving mechanism 4 includes: a driving device 41, a driving rod 42, a transmission rod 43, a driven rod 44, a rotating shaft 45, a first swing arm 46, and a connecting rod 47. Among them, the rotating shaft 45 passes through the housing 1 and is rotatably connected to the side wall of the housing 1. One end of the rotating shaft 45 is fixedly connected to the driven rod 44. The end of the driven rod 44 away from the rotating shaft 45 is hinged to the transmission rod 43. The end of the transmission rod 43 away from the driven rod 44 is hinged to one end of the driving rod 42. The end of the driving rod 42 away from the transmission rod 43 is hinged to the output end of the driving device 41. One end of the first swing arm 46 is fixedly connected to the rotating shaft 45. The other end of the first swing arm 46 is hinged to one end of the connecting rod 47. The end of the connecting rod 47 away from the first swing arm 46 is hinged to the surface of the valve plate 2. The output end of the driving device 41 is used to drive the driving rod 42 to rotate. The driving rod 42 drives the transmission rod 43 to move. The transmission rod 43 drives the driven rod 44 to rotate around the axis of the rotating shaft 45. The rotating shaft 45 rotates following the driven rod 44. The rotating shaft 45 drives the first swing arm 46 to swing. The end of the first swing arm 46 away from the rotating shaft 45 drives the valve plate 2 to flip through the connecting rod 47, thereby realizing the driving of the valve plate 2. When the plate surface of the valve plate 2 is perpendicular to the radial direction of the housing 1, the housing 1 is in a completely open state at this time. When the valve plate 2 is in close contact with the valve retaining ring 11, the housing 1 is in a closed state at this time. The valve plate 2 intercepts the soot in the smoke pipe.

[0046] As an example, the number of the first swing arms 46 is at least 2, and the number of the connecting rods 47 corresponds to the number of the first swing arms 46. Compared with the setting of one first swing arm 46, the setting of two first swing arms 46 can improve the stability of the valve plate 2 during the flipping process.

[0047] As an example, the driving device 41 is fixedly connected to the outer wall of the housing 1 through a mounting seat 48. The mounting seat 48 is used to install and fix the driving device 41, ensure the stability of the driving device 41, and thus ensure the full utilization of the driving force of the driving device 41.

[0048] The present invention also provides a control method for a double-drive and double-seal device for the flue gas at the tail of a cement kiln, including:

[0049] S1. Receiving an instruction to open or close the flue;

[0050] S2. When receiving an instruction to open or close the flue, controlling the driving mechanism 4 to drive the valve plate 2 to open or close the flue for discharging the flue gas;

[0051] S3. When the valve plate 2 closes the flue, the valve plate 2 squeezes the flexible graphite 12 on the valve retainer 11 to fill the gap between the valve plate 2 and the valve retainer 11 through the flexible graphite 12.

[0052] In the above method, the gap between the valve plate 2 and the valve retainer 11 can be further filled by the filling bladder 5 to ensure the sealing performance. This solves the problem that there are still small gaps after the edge of the valve plate fits with the valve retainer, resulting in smoke leakage.

[0053] Embodiment 2

[0054] As Figure 8 shown, a double-drive and double-sealing device for the flue gas at the tail of a cement kiln in an exemplary embodiment, the driving mechanism 4 includes: a driving device 41, a driving rod 42, a transmission rod 43, a driven rod 44, a rotating shaft 45 and a second swing arm 49. Among them, the rotating shaft 45 passes through the housing 1 and is rotatably connected to the side wall of the housing 1. One end of the rotating shaft 45 is fixedly connected to the driven rod 44. The end of the driven rod 44 away from the rotating shaft 45 is hinged to the transmission rod 43. The end of the transmission rod 43 away from the driven rod 44 is hinged to one end of the driving rod 42. The end of the driving rod 42 away from the transmission rod 43 is hinged to the output end of the driving device 41. The difference between this embodiment and Embodiment 1 is that one end of the second swing arm 49 is fixedly connected to the rotating shaft 45, and the side surface of the second swing arm 49 is fixedly connected to the valve plate 2. In this structure, when the rotating shaft 45 rotates, it directly drives the second swing arm 49 to swing, and the second swing arm 49 directly drives the valve plate 2 to flip. When the plate surface of the valve plate 2 is perpendicular to the radial direction of the housing 1, the housing 1 is in a completely open state at this time. When the valve plate 2 is in close contact with the valve retainer 11, the housing 1 is in a closed state at this time, and the valve plate 2 intercepts the soot in the flue pipe.

[0055] As an example, the number of the second swing arms 49 is at least 2. The setting of two second swing arms 49 can make the valve plate 2 more stable during the flipping process compared to the setting of one second swing arm 49.

[0056] Embodiment 3

[0057] As Figure 9 shown, a double-drive and double-sealing device for the flue gas at the tail of a cement kiln in an exemplary embodiment, the difference compared to Embodiment 1 is that the main view cross-section of the housing 1 is rectangular. When the driving mechanism 4 drives the valve plate 2 to flip, the two valve plates 2 flip and open in the same direction.

[0058] The exemplary embodiments of the present application can be combined with each other, and the exemplary embodiments obtained by combination also fall within the scope of the present application.

[0059] This application uses specific examples to elaborate on the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core idea of this application; at the same time, for those skilled in the art, according to the idea of this application, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be construed as a limitation to this application.

Claims

1. A double-drive and double-sealing device for the flue gas at the tail of a cement kiln, which is used to control the flue gas emission at the tail of a cement rotary kiln, and is characterized in that, Comprising: A housing (1), a valve plate (2), a valve plate mounting seat (3) and a drive mechanism (4). The valve plate mounting seat (3) is arranged inside the housing (1). The number of the valve plates (2) is 2 and they are used to seal the flue gas. One side of each valve plate (2) is rotatably connected to the corresponding side of the valve plate mounting seat (3). A valve retainer ring (11) is arranged inside the housing (1), and flexible graphite (12) is provided on the valve retainer ring (11). In the closed state of the housing (1), the flexible graphite (12) contacts the valve plate (2). The number of the drive mechanisms (4) is 2, and the drive mechanism (4) is used to drive the valve plate (2) to flip. A filling bladder (5) is provided on the flexible graphite (12). The interior of the filling bladder (5) is filled with a fluid. The filling bladder (5) is connected with a water inlet pipe (51) and a water outlet pipe (52). A pressure valve (53) is provided on the water outlet pipe (52), and a check valve (54) is provided on the water inlet pipe (51). The valve plate (2) is semi-circular and has an arc-shaped edge. A limiting portion (21) is provided at the arc-shaped edge of the valve plate (2). The cross-section of the limiting portion (21) is L-shaped. A storage bladder groove (22) is formed between the limiting portion (21) and the valve plate (2). In the closed state of the housing (1), the filling bladder (5) contacts the arc-shaped edge of the valve plate (2). In the closed state of the valve plate (2), the edge of the valve plate (2) extends towards the inner wall of the housing (1) perpendicular to the valve retainer ring (11). The arm portion of the limiting portion (21) parallel to the edge of the valve plate (2) is arranged opposite to the valve retainer ring (11), and a slit is formed between the arm portion and the valve retainer ring (11). The extension length P of the edge is greater than the extension length Q of the arm portion. The fluid filled in the interior of the filling bladder (5) is water. In the closed state of the valve plate (2), a space capable of squeezing the filling bladder (5) is formed inside the storage bladder groove (22), and the volume of the space is smaller than the volume of the filling bladder (5) in the non-squeezed state.

2. The double-drive and double-seal device for the flue gas at the tail of a cement kiln according to claim 1, wherein The driving mechanism (4) includes: a driving device (41), a driving rod (42), a transmission rod (43), a driven rod (44), a rotating shaft (45), a first swing arm (46) and a connecting rod (47). Among them, the rotating shaft (45) passes through the housing (1) and is rotatably connected to the side wall of the housing (1). One end of the rotating shaft (45) is fixedly connected to the driven rod (44). The end of the driven rod (44) away from the rotating shaft (45) is hinged to the transmission rod (43). The end of the transmission rod (43) away from the driven rod (44) is hinged to one end of the driving rod (42). The end of the driving rod (42) away from the transmission rod (43) is hinged to the output end of the driving device (41). One end of the first swing arm (46) is fixedly connected to the rotating shaft (45). The other end of the first swing arm (46) is hinged to one end of the connecting rod (47). The end of the connecting rod (47) away from the first swing arm (46) is hinged to the surface of the valve plate (2).

3. The double-drive and double-sealing device for the flue gas at the tail of a cement kiln according to claim 2, characterized in that, The number of the first swing arms (46) is at least 2, and the number of the connecting rods (47) corresponds to the number of the first swing arms (46).

4. The double-drive and double-sealing device for the tail gas of a cement kiln according to claim 2, characterized in that, The driving device (41) is fixedly connected to the outer wall of the housing (1) through a mounting seat (48).

5. The double-drive and double-sealing device for the tail gas of a cement kiln according to claim 1, characterized in that, The driving mechanism (4) includes: a driving device (41), a driving rod (42), a transmission rod (43), a driven rod (44), a rotating shaft (45) and a second swing arm (49). Among them, the rotating shaft (45) passes through the housing (1) and is rotatably connected to the side wall of the housing (1). One end of the rotating shaft (45) is fixedly connected to the driven rod (44). The end of the driven rod (44) away from the rotating shaft (45) is hinged to the transmission rod (43). The end of the transmission rod (43) away from the driven rod (44) is hinged to one end of the driving rod (42). The end of the driving rod (42) away from the transmission rod (43) is hinged to the output end of the driving device (41). One end of the second swing arm (49) is fixedly connected to the rotating shaft (45). The side surface of the second swing arm (49) is fixedly connected to the valve plate (2).

6. The double-drive and double-sealing device for the tail gas of a cement kiln according to claim 5, wherein The number of the second swing arms (49) is at least 2.

7. A control method for a double-drive and double-sealing device for cement kiln tail gas according to any one of claims 1 to 6, characterized in that, It includes: S1. Receive an instruction to open or close the flue. S2. When receiving an instruction to open or close the flue, control the driving mechanism (4) to drive the valve plate (2) to open or close the flue for discharging the flue gas. S3. When the valve plate (2) closes the flue, the valve plate (2) squeezes the flexible graphite (12) on the valve retainer ring (11) to fill the gap between the valve plate (2) and the valve retainer ring (11) through the flexible graphite (12).

Images