A high-ash plug door for flue gas

Abstract

The application discloses a kind of for high ash content in flue gas plug door, belong to plug door technical field. Including hollow door plate extending along X axis, and the end of door plate is provided with through opening, inside is equipped with the door of linear drive drive. The door has two parallel sealing plates, and the inner side of the door is provided with an outward expansion mechanism. When the door is closed in place, the outward expansion mechanism is triggered to generate a radial expansion force, causing the outer surfaces of the two sealing plates to tightly adhere to the inner side walls of the door plate, achieving a mechanical forced seal. In addition, an air inlet pipe is also provided for delivering high-pressure gas into the door plate to form a gas pressure barrier, and a shaft sealing mechanism is provided on the outside of the push shaft. This mechanism uses multiple layers of graphite rings and an intermediate cooling structure to dynamically seal and actively cool the push shaft. The application effectively solves the problem of easy internal leakage and short service life of the sealing element in high-ash flue gas environment, ensuring long-term stable operation of the equipment.

Description

Technical Field

[0001] This invention belongs to the field of slide gate technology, specifically relating to a slide gate for high ash content flue gas. Background Technology

[0002] Slide gate valves, as an important type of shut-off valve, are widely used in flue gas duct systems in industrial fields such as thermal power plants, cement plants, and steel plants. They are installed in locations such as the primary hot air ducts of coal mills and flue gas ducts with high dust content, with both ends of the gate valve connected to the flue gas duct. When equipment such as coal mills is under maintenance, the slide gate valve needs to be closed to effectively isolate the flue gas duct from the maintenance area. However, in actual operation, the flue gas inside the flue gas duct not only contains a large amount of corrosive and toxic gaseous components, but also carries a high concentration of solid dust particles. During the frequent opening and closing of the slide gate valve, these dust particles easily penetrate and adhere to the sealing surface and the mating surface of the opening, resulting in a poor seal. In this situation, the dust cannot be completely blocked and thus enters the maintenance area, adversely affecting the safety and reliability of maintenance work and triggering a series of chain problems.

[0003] Currently, various types of gate valves are used in power plant flue gas duct systems, but they generally suffer from poor sealing and are prone to internal leakage. Existing gate valves typically consist of a housing, a gate plate, a stroke actuator, and a locking actuator. The gate plate moves along pre-set guide rollers within the housing under the action of the stroke actuator, thus opening and closing. When the gate plate is closed, the locking actuator activates, pressing the gate plate against the sealing packing on the housing via a cam locking mechanism, thereby completing the shut-off action and isolating the upper and lower air ducts. To open, the locking actuator first releases the locking cam, and then the stroke actuator moves the gate plate to the open position, fully opening the flow passage. However, the above structure has several shortcomings in practical applications. Its push rod often uses a circular sealing surface design, with graphite packing installed on the sealing surface between the housing and the gate plate, relying on the pressure of the gate plate to achieve a seal. However, the hot air duct contains a large amount of dust, and the original roller-closing and push-rod pressing method used by the baffle plate has limited and uneven sealing pressure, making it difficult to form a continuous and uniform fit across the entire sealing perimeter. During long-term operation, the packing and other sealing materials are easily worn, hardened, or ablated by the continuous scouring of high-temperature flue gas and dust, leading to a gradual increase in the sealing gap and eventually causing internal leakage.

[0004] Secondly, some improved solutions add elastic clamping mechanisms to the door frame or insert plate movement path, attempting to enhance the seal by applying additional clamping force to the insert plate through energy storage elements such as springs. While such mechanisms improve the sealing effect to some extent, in high-ash environments, their moving parts (such as swing arms, rollers, sliders, etc.) and elastic elements are usually exposed to the flue gas passage. High concentrations of dust can easily penetrate the rotating joints, sliding mating surfaces, and spring chambers, causing movement jamming, spring force attenuation, or even complete failure. Once the clamping mechanism fails, the insert plate cannot be effectively clamped to the sealing surface, and the sealing reliability is actually worse than that of conventional structures. In addition, the dynamic seal between the drive push rod of the insert door and the door body is also a weak point. The push rod reciprocates in the high-temperature flue gas environment. Without effective cooling and dust isolation measures, conventional packing seals are prone to rapid burnout or wear, causing flue gas to leak out along the push rod, which not only pollutes the surrounding environment but may also pose health hazards to on-site maintenance personnel.

[0005] Most of the pressing mechanisms of existing slide gates adopt a one-way pressing method, and the moving parts are exposed in the inner cavity of the door frame. In high ash flue gas environments, dust can easily enter the rotating joint and spring chamber, affecting the reliability of operation. For example, the self-locking mechanism in the patent "A Spring-type Self-locking Pneumatic Sealing Slide Gate" with publication number CN114738505A. At the same time, the existing slide gates lack sealing and cooling measures at the drive shaft, and still face the risk of flue gas leaking out along the push rod under high temperature conditions. Summary of the Invention

[0006] To address the shortcomings of existing slide gates used in high-ash flue gas applications, such as poor sealing and internal leakage caused by dust accumulation on the sealing surface, this invention provides a slide gate for high-ash flue gas applications, achieving a combination of physical compression sealing, air pressure back-sealing to prevent internal leakage, and long-term sealing performance of the drive shaft.

[0007] To achieve this objective, the following solution is provided: This invention provides a high-ash flue gas insertion door, comprising a hollow door panel and a linear actuator. The door panel has an opening extending axially along the Z-axis, and the hollow inner cavity of the door panel is also provided with a sealing door. The linear actuator is connected to one end of the sealing door via a push shaft, and is used to drive the sealing door to slide along the X-axis in the hollow inner cavity of the door panel to open and close the opening. The door sealing includes two parallel sealing plates, which are connected on one side by a connecting plate. An outward expansion mechanism is provided between them. The outward expansion mechanism can generate a radial expansion force from the inside to the outside, causing the outer surfaces of the two sealing plates to fit tightly against the inner wall of the door panel, thus sealing the opening.

[0008] The expansion mechanism includes at least two parallel guide rods extending along the X-axis. One end of each guide rod is elastically connected to the connecting plate via an elastic element, and the other end extends out of the sealing door. At least two pairs of tension elements are symmetrically arranged on each guide rod. A trigger element corresponding to the position of the guide rod is fixed on the door panel.

[0009] Furthermore, the trigger includes a cylindrical rod fixed to the inside of the door panel; the position of the cylindrical rod corresponds to the other end of the guide rod.

[0010] Furthermore, the inner side of the cylindrical rod is threaded with a threaded rod, and one end of the threaded rod facing the guide rod is provided with an adjustable extension length stop, and the other end is provided with a knob.

[0011] Furthermore, the tensioning element includes a sleeve rod sleeved on the guide rod; two force-applying plates are rotatably connected to the sleeve rod, and rotating seats are rotatably connected to the distal ends of the two force-applying plates. The two rotating seats are respectively fixed to the inner side of the two sealing plates and close to the opening position; when the sealing door is in the closed state, the force-applying plates are distributed in a "I" shape.

[0012] Furthermore, the air outlet of the air inlet pipe is also connected inside the door panel.

[0013] Furthermore, a shaft sealing mechanism is fitted outside the drive shaft.

[0014] Furthermore, the shaft sealing mechanism includes a sleeve; one end of the sleeve is installed on the outside of the door panel, and graphite filling ring one, graphite filling ring two, and graphite packing are sequentially arranged inside the sleeve from the side closer to the door panel to the side farther away from the door panel; a pressure cap ring is provided on the side of the sleeve away from the door panel; the pressure cap ring and the sleeve are assembled by bolts to encapsulate graphite filling ring one, graphite filling ring two, and graphite packing inside the sleeve.

[0015] Furthermore, a hood is provided inside the envelope between the first graphite filling ring and the second graphite filling ring, and an air inlet and an air outlet connected to the ventilation hood are provided outside the envelope.

[0016] Furthermore, a sealing gasket is attached to the inner side of the door panel.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The sealing door of the present invention is set as a "C" - shaped structure with a hollow interior, forming an accommodation space inside, and an outward - expanding mechanism is configured on its inner side, with a compact structure. When the sealing door is closed in place, the outward - expanding mechanism is triggered to generate a radially outward expansion force, prompting the outer surfaces of the two sealing plates to actively press against the inner side wall of the door panel,联动 with the closing stroke of the sealing door. This physical pressing method is different from the traditional passive sealing that relies on the elastic deformation of the sealing element, can effectively overcome the adverse influence of dust adhesion on the sealing surface on the fitting degree, and the deformation mechanism of the force - applying piece makes the expansion force stable and controllable, and can actively compensate for the assembly gap between the sealing plate and the inner wall of the door panel, improving the sealing performance between the sealing door and the through - opening. At the same time, the abutting block of the triggering part can adjust the extending length through the threaded rod and the knob, facilitating fine - tuning of the triggering timing and the magnitude of the expansion force according to the actual working conditions.

[0018] 2. The present invention integrally places the outward - expanding mechanism inside the sealing door. Its guide rod, elastic element, and tension element are all in a relatively enclosed space, protected by the self - shielding of the sealing plate, greatly reducing the direct scouring of high - ash - content flue gas on the moving mechanism and the risk of dust intrusion, ensuring the long - term reliability and stability of the pressing action.

[0019] 3. The present invention adds an air inlet pipe inside the door panel, and conveys gas with a pressure higher than the outside to the inside of the door panel in the state of the through - opening being closed, forming an air pressure barrier. This air pressure anti - sealing means cooperates with the mechanical expansion sealing. Even when the external pressure is greater than the internal pressure, the high - pressure gas can effectively block the leakage of dust - containing flue gas to the maintenance side, further reducing the risk of internal leakage.

[0020] 4. The present invention sets an axial sealing mechanism outside the push shaft, adopts a combined seal of multiple graphite rings and graphite packing, and sets a wind hood between the sealing layers to actively cool the push shaft through a circulating air flow. This structure effectively reduces the ablation speed of the sealing element caused by high temperature, extends the service life of the axial seal, and ensures the dynamic sealing reliability of the push shaft during the reciprocating movement.

[0021] 5. Through the coordinated cooperation of the mechanical expansion sealing, air pressure anti - sealing to prevent internal leakage, and drive shaft cooling and sealing, the present invention changes from the traditional passive fitting in the sealing principle to the combination of active pressing and air pressure barrier. In the structural design, the core moving mechanism is placed inside the sealing door to resist dust intrusion, and in the weak link, the drive shaft is subjected to multi - layer sealing and active cooling to extend the life of the components. This improvement enables the plug valve to more effectively adapt to the harsh working conditions of high - ash - content flue gas, reduces the risk of internal leakage and failure rate caused by dust adhesion, mechanism jamming, and shaft seal ablation, and provides a more reliable safety isolation guarantee for the maintenance operations of equipment such as coal mills. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three - dimensional structural schematic diagram of the high - ash - content plug valve for flue gas of the present invention; Figure 2 Schematic diagram of partial cross-section of the door panel in the high-ash plug door in the flue gas of the present invention; Figure 3 Schematic diagram of the structure of the outward expansion mechanism in the high-ash plug door in the flue gas of the present invention; Figure 4 Enlarged schematic diagram of part A of the outward expansion mechanism in the high-ash plug door in the flue gas of the present invention; Figure 5 Enlarged schematic diagram of part B of the outward expansion mechanism in the high-ash plug door in the flue gas of the present invention; Figure 6 Schematic diagram of the structure of the shaft sealing mechanism in the high-ash plug door in the flue gas of the present invention.

[0023] The reference signs in the drawings are shown as: 1, door panel; 11, through-hole; 2, sealing door; 21, outward expansion mechanism; 211, guide rod; 212, elastic member; 213, trigger member; 2131, cylindrical rod; 2132, threaded rod; 2133, abutting block; 2134, knob; 214, tension member; 2141, sleeve rod; 2142, force-applying piece; 2143, rotating seat; 3, linear actuator; 4, pushing shaft; 5, intake pipe; 6, shaft sealing mechanism; 61, sealing sleeve; 62, graphene filling ring I; 63, graphene filling ring II; 64, graphite packing; 65, gland ring; 66, ventilation hood. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] Refer to Figure 1-5 , the present invention is a high-ash plug door for flue gas, including a door panel 1 and a linear actuator 3. The door panel 1 is provided with a hollow inner cavity extending along the X-axis direction. A through-hole 11 extending along the Z-axis is opened on the door panel 1. A sealing door 2 is arranged in the hollow inner cavity. The telescopic end of the linear actuator 3 penetrates into the side of the door panel 1 and is rigidly connected to one end of the sealing door 2 through a pushing shaft 4. Under the stretching / compressing action of the linear actuator 3, the sealing door 2 is driven to perform a reciprocating linear motion along the X-axis direction in the hollow inner cavity, so as to realize the switching of the opening and closing functions of the through-hole 11; the sealing door 2 includes two parallel sealing plates. One side of the two sealing plates is connected by a connecting plate, and the remaining three sides form an opening, having a "C" - shaped structure. An outward expansion mechanism 21 is fixed between the two sealing plates; (to clearly show the specific structure of the outward expansion mechanism 21 and its connection relationship with the sealing plates, Figure 3(It is noted that the two sealing plates of the sealing door 2 are retained as the installation base.) When the sealing door 2 is needed to seal the opening 11, the outward expansion mechanism 21 can generate a radial expansion force from the inside to the outside, causing the outer surfaces of the two sealing plates to fit tightly against the inner sidewall of the door panel 1, thereby sealing the opening 11.

[0026] The expansion mechanism 21 includes two parallel guide rods 211 extending along the X-axis. One end of each guide rod 211 is connected to a connecting plate between the two sealing plates via an elastic element 212, and the other end extends out of the sealing door 2. At least two pairs of tension elements 214 are symmetrically arranged on the sides of the guide rods 211. A trigger element 213 is fixed on the inner side of the door panel 1 near the opening 11, corresponding to the position of the guide rods 211. (It should be noted that...) Figure 3 The trigger 213 and guide rod 211 are drawn in the same view only to show their cooperation when the door is closed. This does not mean that the trigger 213 is installed on the guide rod 211; the two are spatially independent. When the door 2 moves to the opening 11 and is in a closed state, the guide rod 211 and the trigger 213 abut against and compress the elastic element 212. After the door 2 is in place, the elastic element 212 rebounds, driving the tension element 214 to expand from the inside out.

[0027] In a preferred embodiment, the trigger 213 includes a cylindrical rod 2131. A threaded rod 2132 is threadedly connected to the inner side of the cylindrical rod 2131. One end of the threaded rod 2132 facing the guide rod 211 has an adjustable extension block 2133, and the other end has a knob 2134. By rotating the threaded rod 2132 using the knob 2134, the threaded rod 2132 moves along the direction of thread rotation, thereby pressing tightly against the guide rod 211 via the block 2133, preventing the guide rod 211 from loosening, and further improving the sealing between the sealing door 2 and the opening 11.

[0028] As a preferred embodiment, the tension member 214 includes at least two sleeves 2141 sleeved on the guide rod 211; each sleeve 2141 is rotatably connected to two force-applying plates 2142, and the distal ends of the two force-applying plates 2142 are rotatably connected to rotating seats 2143, and the two rotating seats 2143 are respectively fixed to the inner side of the two sealing plates and close to the opening 11; when the sealing door 2 is in the closed state, the elastic member 212 rebounds along the X-axis direction under the abutment of the column rod 2131, causing the two force-applying plates 2142 to unfold from the "eight" shape to the "one" shape. Since the rotating seats 2143 at both ends of the force-applying plate 2142 are fixed inside the sealing plate, the force-applying plates 2142 distributed in a "I" shape will generate outward tension on the two sealing plates, so that the inner side of the sealing door 2 and the edge of the opening 11 are tightly fitted. The tensioning element 214 generates a stable outward tension on the sealing plate, thereby enhancing the sealing performance between the sealing door 2 and the opening 11, effectively avoiding the problem of poor sealing caused by dust and other factors, ensuring reliable isolation between the maintenance area and the flue gas duct, and improving the safety of coal mill maintenance work.

[0029] As a preferred embodiment, the door panel 1 is also connected to the outlet end of the air inlet pipe 5. The air inlet end is connected to an air pump, which is used to deliver gas with a higher pressure than the outside to the inside of the door panel 1 when the opening 11 is closed, so as to avoid the door 2 not sealing properly due to the external pressure being greater than the internal pressure.

[0030] In a preferred embodiment, a shaft sealing mechanism 6 is fitted onto the outside of the drive shaft 4. This mechanism provides a seal when the drive shaft 4 reciprocates along the X-axis.

[0031] As a preferred embodiment, the shaft sealing mechanism 6 includes a sleeve 61; one end of the sleeve 61 is installed on the outside of the door panel 1, and graphite filling ring 62, graphite filling ring 63 and graphite packing 64 are arranged sequentially from the side closer to the door panel 1 to the side farther away from the door panel 1 inside the sleeve 61; a pressure cap ring 65 is provided on the side of the sleeve 61 away from the door panel 1; the pressure cap ring 65 is assembled with the sleeve 61 by bolts to encapsulate the graphite filling ring 62, graphite filling ring 63 and graphite packing 64 inside the sleeve 61.

[0032] In a preferred embodiment, a hood 66 is provided inside the envelope 61 between the graphene-filled ring 62 and the graphene-filled ring 63, and an air inlet and an air outlet connected to the hood 66 are provided on the outside of the envelope 61. The circulating airflow passes through the hood 66 to cool the drive shaft 4, thereby reducing the burn-off rate of the graphene-filled ring 62, the graphene-filled ring 63, and the graphene packing 64 caused by the high temperature.

[0033] As a preferred embodiment, a sealing gasket is attached to the inner side of the door panel 1 to ensure the fit between the sealing plate and the sealing gasket, thereby improving the sealing performance between the door 2 and the door panel 1.

[0034] Refer to the instruction manual appendix Figure 1-5 When using this device, the door panel 1 is installed on the hot primary air of the coal mill, and both ends of its opening 11 are connected to the flue gas duct with high dust content. When the coal mill is running normally, the linear actuator 3 pulls the sealing door 2 back into the receiving cavity on the left side inside the door panel 1, fully opening the opening 11 and allowing normal flue gas flow. When the coal mill needs maintenance, the linear actuator 3 pushes the sealing door 2 to move towards the opening 11 along the X-axis.

[0035] As the sealing door 2 begins to move along the X-axis toward the opening 11, the guide rod 211 extends beyond the front end of the sealing door 2 and contacts the cylindrical rod 2131 on the inner side of the door panel 1. As the sealing door 2 continues to move, the cylindrical rod 2131 exerts a resisting force on the guide rod 211, forcing the guide rod 211 to move away from the sealing door 2 along the X-axis. During this process, the guide rod 211 compresses the elastic element 212, causing the elastic element 212 to deform under force, providing space for the movement of the guide rod 211. At the same time, the tension element 214 on the guide rod 211 moves along with the guide rod. The displacement begins to move in tandem; when the sealing door 2 is fully closed and the opening 11 is closed, the linear actuator 3 stops driving, the resistance force of the cylindrical rod 2131 against the guide rod 211 reaches its maximum, the elastic element 212 rebounds along the X-axis under the resistance and maintains the force state, at this time, the guide rod 211 completes the rebound action under the drive of the elastic element 212, and then drives the sleeve rod 2141 of the tension element 214 to move, so that the two force-applying plates 2142 that were originally in the shape of "eight" gradually unfold and finally form a "one" shape. Since the rotating seats 2143 at both ends of the force-applying plate 2142 are fixed inside the sealing plate, the force-applying plates 2142 distributed in a "I" shape will generate outward tension on the two sealing plates, so that the inner side of the sealing door 2 and the edge of the opening 11 are tightly fitted. The tensioning element 214 generates a stable outward tension on the sealing plate, thereby enhancing the sealing performance between the sealing door 2 and the opening 11, effectively avoiding the problem of poor sealing caused by dust and other factors, ensuring reliable isolation between the maintenance area and the flue gas duct, and improving the safety of coal mill maintenance work.

[0036] Simultaneously, when the sealing door 2 is closed, i.e., the opening 11 is completely sealed, the gas conveyor starts and delivers gas into the door panel 1 through the air inlet pipe 5. During the delivery process, the gas conveyor precisely controls the gas pressure to ensure that the gas pressure inside the door panel 1 is always higher than the pressure of the external flue gas duct and the maintenance area. The design, through the cooperation of the air inlet pipe 5 and the gas conveyor, can provide a higher air pressure environment inside the door panel 1 than outside when the opening 11 is closed. When the external pressure tends to be greater than the internal pressure, the high-pressure gas inside the door panel 1 can form a "pressure barrier" to effectively offset the impact of the external pressure and prevent gaps from appearing between the sealing door 2 and the opening 11 due to pressure difference, thereby avoiding the occurrence of poor sealing. Combined with the tension effect of the expansion mechanism 21 on the door panel 1, this process further enhances the overall sealing performance of the slide door. Even in complex environments with high ash content in the flue gas, it can reduce the risk of dust intrusion into the maintenance area, providing double protection for the safety and reliability of coal mill maintenance work.

[0037] Furthermore, during the reciprocating motion of the push shaft 4 along the X-axis, the sleeve 61, as the basic load-bearing structure, stably constrains the sealing elements such as graphene-filled ring 62, graphene-filled ring 63, and graphite packing 64 within the fitting gap with the push shaft 4. The pressure ring 65 is fastened to the sleeve 61 with bolts, forming continuous axial pressure on the internal sealing elements. This ensures that the graphene-filled ring 62, graphene-filled ring 63, and graphite packing 64 are always in close contact with the surface of the push shaft 4. Utilizing the flexibility of graphene material and the wear resistance of graphite packing 64, the leakage path of high-ash particles in the flue gas is blocked. Simultaneously, the cooling airflow enters the hood 66 through the air inlet outside the sleeve 61, directly acting on the surface of the push shaft 4. After absorbing the heat conducted by the high temperature of the flue gas on the shaft, the airflow is discharged from the air outlet. Through continuous heat exchange, the temperature of the push shaft 4 is reduced, thereby reducing the transfer of heat to the graphene-filled ring 62, graphene-filled ring 63, and graphite packing 64.

[0038] When the coal mill is overhauled and ventilation needs to be restored, the linear actuator 3 pulls the sealing door 2 to move away from the opening 11 along the X-axis. That is, when the sealing door 2 is not closed, the expansion mechanism is in its initial state: two parallel guide rods 211 are elastically connected to the connecting plate through the elastic element 212, and the elastic element 212 is not under force; the two force-applying plates 2142 of the tension element 214 are distributed in a figure-eight shape, and the rotating seat 2143 at the far end of them is fixed on the inner side of the two door plates 1 near the opening 11. One end of the guide rod 211 extends out of the sealing door 2, and the other end does not contact the trigger element 213; at the same time, the air inlet pipe 5 does not transport gas temporarily, and the gas conveyor is in standby state to avoid gas transport interfering with the normal flow of the opening 11.

[0039] This design achieves dynamic sealing of the drive shaft 4 during reciprocating motion through the synergistic effect of multi-layer sealing and active cooling design. This enhances sealing reliability, extends component life, adapts to high ash content conditions, and features a compact and easy-to-maintain structure, ensuring long-term stable operation of the slide gate in complex flue gas environments.

[0040] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A high-ash-content door for flue gas, comprising a hollow door panel (1) and a linear actuator (3), characterized in that, The door panel (1) has an opening (11) extending axially along the Z-axis, and the hollow inner cavity of the door panel (1) is also provided with a sealing door (2); the linear actuator (3) is connected to one end of the sealing door (2) through a push shaft (4) and is used to drive the sealing door (2) to slide along the X-axis in the hollow inner cavity of the door panel (1) to open and close the opening (11). The sealing door (2) includes two parallel sealing plates. One side of the sealing plates is connected by a connecting plate, and an expansion mechanism (21) is provided between them. The expansion mechanism (21) can generate a radial expansion force from the inside to the outside, causing the outer surfaces of the two sealing plates to fit tightly against the inner wall of the door panel (1) and block the opening (11).

2. The expansion mechanism (21) includes at least two parallel guide rods (211) extending along the X-axis. One end of each guide rod (211) is elastically connected to the connecting plate through an elastic element (212), and the other end extends out of the sealing door (2). At least two pairs of tension elements (214) are symmetrically arranged on each guide rod (211). A trigger element (213) corresponding to the position of the guide rod (211) is fixed on the door panel (1) near the opening (11).

3. A high-ash flue gas insertion door according to claim 1, characterized in that, The trigger (213) includes a column rod (2131) fixed to the inside of the door panel (1); the position of the column rod (2131) corresponds to the other end of the guide rod (211).

4. A high-ash flue gas insertion door according to claim 2, characterized in that, The inner side of the cylindrical rod (2131) is threaded with a threaded rod (2132). The threaded rod (2132) has an adjustable extension length stop (2133) at one end facing the guide rod (211), and a knob (2134) at the other end.

5. A high-ash flue gas insertion door according to claim 1, characterized in that, The tensioning element (214) includes a sleeve rod (2141) sleeved on the guide rod (211); two force-applying plates (2142) are rotatably connected to the sleeve rod (2141), and rotating seats (2143) are rotatably connected to the far ends of the two force-applying plates (2142). The two rotating seats (2143) are respectively fixed to the inner side of the two sealing plates and close to the opening (11); when the sealing door (2) is in the closed state, the force-applying plates (2142) are distributed in a "I" shape.

6. A high-ash flue gas insertion door according to claim 1, characterized in that, The door panel (1) is also connected to the air outlet of the air inlet pipe (5).

7. A high-ash flue gas insertion door according to claim 1, characterized in that, The drive shaft (4) is fitted with a shaft sealing mechanism (6).

8. A high-ash flue gas insertion door according to claim 6, characterized in that, The shaft sealing mechanism (6) includes a sleeve (61); one end of the sleeve (61) is installed on the outside of the door panel (1), and graphite filling ring one (62), graphite filling ring two (63) and graphite packing (64) are arranged sequentially from the side closer to the door panel (1) to the side farther away from the door panel (1); a pressure ring (65) is provided on the side of the sleeve (61) away from the door panel (1); the pressure ring (65) and the sleeve (61) are assembled by bolts to encapsulate graphite filling ring one (62), graphite filling ring two (63) and graphite packing (64) inside the sleeve (61).

9. A high-ash flue gas insertion door according to claim 7, characterized in that, The cover (61) is provided with a hood (66) located between the first graphite filling ring (62) and the second graphite filling ring (63) inside the cover (61), and the cover (61) is provided with an air inlet and an air outlet connected to the hood (66).

10. A high-ash flue gas insertion door according to claim 1, characterized in that, A sealing gasket is attached to the inside of the door panel (1).

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