Flue baffle door device

Abstract

The utility model provides a flue baffle door device, and belongs to the technical field. According to the technical scheme, the flue baffle door device is installed between a boiler and a flue gas desulfurization mechanism and comprises a sliding plate door shell, the sliding plate door shell is provided with a first end face, a second end face and a door opening, the first end face and the second end face are oppositely arranged, and the door opening penetrates through the first end face and the second end face. The second end face is in sealed connection with the gas inlet end of the flue gas desulfurization mechanism, the sliding plate door shell is movably connected with at least two sliding plate door bodies, the two sliding plate door bodies are both connected with the driving mechanism, and the driving mechanism is at least used for driving the two sliding plate door bodies to move on the sliding plate door shell so as to jointly close or open the door opening. According to the sliding plate gate, the two sliding plate gate bodies are arranged to jointly close or open the door opening, the moving stroke of the single sliding plate gate body is reduced, the moving stability of the sliding plate gate bodies is improved, and the phenomena of shaking and jamming are effectively avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of baffle type flue gas isolation door, especially to a flue baffle door device. BACKGROUND

[0002] In the case of normal operation of the desulfurization system, the flue gas from the tail of the boiler electric precipitator passes through the inlet baffle door of the flue gas desulfurization system to the booster fan, and then enters the absorption tower by the flue gas heat exchanger for cooling, the flue gas after desulfurization is heated to about 80 DEG C by the flue gas heat exchanger, and then enters the chimney through the outlet desulfurization baffle door of the flue gas desulfurization system. The isolation and connection between the boiler chimney and the desulfurization tower are realized by the opening and closing of the desulfurization baffle door in the flue gas system, and the baffle door plays a crucial role in ensuring the normal and stable operation of the boiler and the desulfurization system and the safety of the system equipment.

[0003] However, the current baffle door is usually driven by an oil cylinder to move to close or open the door hole. Since the baffle door is a single plate structure, the stroke is long during movement, and thus the baffle door is prone to shaking and jamming during opening and closing, which in turn easily causes flue gas leakage. UTILITY MODEL CONTENT

[0004] The utility model discloses a flue baffle door device to solve the problem of flue gas leakage caused by shaking and jamming of the baffle door during movement.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The utility model provides a kind of flue baffle door device, it is installed between boiler and flue gas desulfurization mechanism, including plug-in door casing, plug-in door casing is equipped with oppositely arranged first end face and second end face, and the door hole that passes through first end face and second end face, first end face is sealingly connected with the gas outlet end of boiler, and second end face is sealingly connected with the gas inlet end of flue gas desulfurization mechanism, plug-in door casing is movably connected with at least two plug-in door door bodies, two plug-in door door bodies are connected with driving mechanism, and driving mechanism is at least used to drive two plug-in door door bodies to move on plug-in door casing, to jointly close or open door hole. The device is closed or opened by two plug-in door door bodies, the stroke of single plug-in door door body is reduced, the moving stability of plug-in door door body is improved, and the phenomenon of shaking and jamming is effectively avoided.

[0007] Further, the two plug door bodies are arranged oppositely, the driving mechanism comprises two driving assemblies which are identical in structure, the two driving assemblies are connected with the two plug door bodies one by one, the driving assembly is provided with a screw rod, a moving block and a pull rod, the moving block is connected with the screw rod in a matched mode, one end of the pull rod is fixedly connected with the moving block, the other end of the pull rod is fixedly connected with the plug door body, the screw rod is driven to rotate around its own axis by external force to drive the moving block to move along the axial direction of the screw rod, and then the pull rod and the plug door body are driven to move, and the moving directions of the two plug door bodies are opposite. The device drives the plug door body to move through the screw rod and the moving block structure, and the stability and accuracy of movement are improved.

[0008] Further, the pull rod is provided with an accommodating groove which can accommodate the screw rod along the axial direction of the pull rod, and the axial direction of the pull rod is consistent with the axial direction of the screw rod. Part of the screw rod can extend into the accommodating groove, so that the space can be saved, and the guiding and limiting effects can be achieved.

[0009] Further, the pull rod is provided with a first limiting block along the circumferential direction of the pull rod, the plug door shell is provided with a second limiting block, and the first limiting block and the second limiting block abut against each other during the movement of the pull rod, so that the movement of the pull rod is limited. The continuous rotation of the screw rod is avoided, the screw rod is not easy to be stuck, and the safety is improved.

[0010] Further, the plug door body is provided with a guide wheel at both ends which are perpendicular to the moving direction of the plug door body, the plug door shell is provided with a sliding groove at opposite ends, the guide wheel is connected with the sliding groove in a matched mode, and the guide wheel can move in the sliding groove. The phenomenon that the plug door body is easy to deviate during the movement due to the accumulation of soot on the side of the plug door body is effectively avoided.

[0011] Further, the plug door shell is provided with a fixed beam which extends along the direction perpendicular to the moving direction of the plug door body, and the fixed beam is arranged between the two plug door bodies, opposite ends of the fixed beam are provided with receiving grooves, at least part of the plug door bodies are inserted into the receiving grooves in the state that the plug door bodies close the door hole, the receiving grooves are provided with first sealing strips, and the first sealing strips are movably sealed with the plug door bodies. The structural strength of the plug door shell is further improved by arranging the fixed beam, and the sealing performance in the state that the door hole is closed is improved by arranging the receiving grooves and the first sealing strips on the fixed beam, and the smoke is effectively prevented from escaping.

[0012] Further, the plug door shell is provided with a pressing plate along the periphery of the door hole, and a second sealing strip is arranged between the pressing plate and the plug door body, and the second sealing strip is movably sealed with the plug door body. The sealing effect is further improved.

[0013] Further, the plug door shell is provided with a pressing wheel at both ends perpendicular to the moving direction of the plug door body, and the plug door body is provided with a slope block at both ends perpendicular to the moving direction of the plug door body, and the pressing wheel is in abutment with the slope block in the state that the plug door body closes the door hole, thereby further ensuring the stability of the plug door body.

[0014] Further, the first end surface is provided with a first partition plate along the circumference of the door hole, the first partition plate is provided with a first reverse flange at one end away from the first end surface, the first reverse flange is in sealing connection with the gas outlet end of the boiler, the second end surface is provided with a second partition plate along the circumference of the door hole, and the second partition plate is provided with a second reverse flange at one end away from the second end surface, and the second reverse flange is in sealing connection with the gas inlet end of the flue gas desulfurization mechanism. By arranging the flange structure, installation and disassembly are facilitated, and subsequent maintenance is facilitated.

[0015] It can be seen from the above technical scheme that the utility model has the advantages that:

[0016] 1. The utility model discloses a structure that two plug door bodies jointly close or open the door hole, thereby reducing the stroke of the single plug door body, improving the moving stability of the plug door body, and effectively avoiding the shaking and jamming phenomenon.

[0017] 2. The utility model discloses a structure that the fixed beam further improves the structural strength of the plug door shell, and the receiving groove and the first sealing strip are arranged on the fixed beam, thereby improving the sealing property in the state that the door hole is closed and effectively avoiding the flue gas from escaping.

[0018] 3. The utility model discloses a structure that the pressing wheel and the slope block improve the stability of the plug door body in the state that the door hole is closed and avoid the shaking phenomenon caused by the impact of the flue gas on the plug door body. DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the utility model, the drawings needed in the description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0020] Figure 1 is a structure schematic view of the door hole in the open state in an embodiment of the utility model;

[0021] Figure 2 is a structure schematic view of the door hole in the closed state in an embodiment of the utility model;

[0022] Figure 3 is a partial structure sectional view of the device in an embodiment of the utility model;

[0023] Figure 4is Figure 3 Enlarged view at A in Fig.

[0024] Explanation of reference numerals:

[0025] 100, plug door shell; 111, first partition plate; 112, first reverse flange piece; 121, second partition plate; 122, second reverse flange piece; 130, door hole; 140, second limiting block; 150, sliding groove; 160, fixed beam; 161, first sealing strip; 170, pressing plate; 171, second sealing strip; 180, pressing wheel; 200, plug door door body; 210, guide wheel; 220, slope block; 300, driving assembly; 310, lead screw; 320, moving block; 330, pull rod; 340, first limiting block. DETAILED DESCRIPTION

[0026] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the technical solutions of the present application will be described clearly and completely in combination with the drawings in the specific embodiments. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present patent, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present patent.

[0027] Please refer to Figures 1-4 A flue baffle door device is installed between a boiler and a flue gas desulfurization mechanism, comprising a plug door shell 100, the plug door shell 100 is provided with oppositely arranged first and second end faces and a door hole 130 penetrating through the first and second end faces, the first end face is sealingly connected with the gas outlet end of the boiler, the second end face is sealingly connected with the gas inlet end of the flue gas desulfurization mechanism, the plug door shell 100 is movably connected with at least two plug door door bodies 200, the two plug door door bodies 200 are connected with a driving mechanism, the driving mechanism is used for driving the two plug door door bodies 200 to move on the plug door shell 100, so as to jointly close or open the door hole 130.

[0028] In the present embodiment, as Figure 1 , 2As shown, the plug door shell 100 is horizontally placed, the lower end surface of which forms a first end surface and is sealingly connected with the gas outlet end of the boiler, and the upper end surface of the plug door shell 100 forms a second end surface and is sealingly connected with the gas inlet end of the flue gas desulfurization mechanism, the plug door shell 100 is provided with a door hole 130, and the gas outlet end of the boiler and the gas inlet end of the flue gas desulfurization mechanism can be communicated through the door hole 130, wherein the plug door shell 100 is a rectangular cuboid structure, and the corresponding door hole 130 is also a rectangular opening structure, and two plug door bodies 200 are movably connected on the plug door shell 100, and a driving mechanism is connected with the two plug door bodies 200, when the boiler and the flue gas desulfurization mechanism need to be communicated, the driving mechanism is controlled to drive the two plug door bodies 200 to move, so as to open the door hole 130, and when the boiler and the flue gas desulfurization mechanism need to be blocked, the driving mechanism is controlled to drive the two plug door bodies 200 to move reversely, so that the two plug door bodies 200 jointly close the door hole 130, and in addition, when the opening size of the door hole 130 is needed, the driving mechanism can be controlled to control one plug door body 200 to move.

[0029] In the above structure, the two plug door bodies 200 are arranged oppositely to jointly close or open the door hole 130, the stroke of the movement of a single plug door body 200 is reduced, the movement stability of the plug door body 200 is improved, and the phenomena of shaking and jamming are effectively avoided, and in addition, the two plug door bodies 200 are connected with the driving mechanism to drive the movement thereof, and the control ability of the opening size is improved.

[0030] As shown in the specific structure of the driving mechanism, Figure 1 , 2 two plug door bodies 200 are arranged oppositely, the driving mechanism includes two driving assemblies 300 which are the same in structure, the two driving assemblies 300 are connected with the two plug door bodies 200 one by one, the driving assembly 300 is provided with a lead screw 310, a moving block 320 and a pull rod 330, the moving block 320 is movably connected with the lead screw 310, one end of the pull rod 330 is fixedly connected with the moving block 320, and the other end of the pull rod 330 is fixedly connected with the plug door body 200, the lead screw 310 is driven to rotate around its own axis to drive the moving block 320 to move along the axial direction of the lead screw 310, and then drive the pull rod 330 and the plug door body 200 to move, and the moving directions of the two plug door bodies 200 are opposite. The pull rod 330 is provided with an accommodating groove along its own axial direction, which can accommodate the lead screw 310, and the axial direction of the pull rod 330 is consistent with the axial direction of the lead screw 310. The pull rod 330 is provided with a first limiting block 340 along its own circumferential direction, and the plug door shell 100 is provided with a second limiting block 140, and the first limiting block 340 and the second limiting block 140 abut each other during the movement of the pull rod 330, so as to limit the movement of the pull rod 330.

[0031] In the embodiment, the plug door body 200 is in a rectangular plate structure, and the two plug door bodies 200 are horizontally placed, wherein the two plug door bodies 200 are oppositely arranged along the width direction, the width direction of the plug door body 200 is consistent with the length direction of the plug door shell 100, the driving mechanism drives the plug door body 200 to move along the length direction of the plug door shell 100, and the ends of the two plug door bodies 200 along the width direction abut or separate during the movement, so as to realize closing or opening the door hole 130, wherein the two plug door bodies 200 are respectively connected with one driving assembly 300, and the two driving assemblies 300 are oppositely arranged, the driving assembly 300 comprises a lead screw 310 extending along the length direction of the plug door shell 100, a moving block 320 is connected with the lead screw 310 in a matched mode, a lead screw nut structure matched with the lead screw 310 is arranged on the moving block 320, a pull rod 330 is fixedly connected to one end of the moving block 320 close to the plug door body 200, the other end of the pull rod 330 is fixedly connected with the plug door body 200, and the extension direction of the pull rod 330 is also the length direction of the plug door body 200. The lead screw 310 is driven to rotate around its axis by an external force, so that the moving block 320 drives the pull rod 330 to move along the axial direction of the lead screw 310, and then drives the plug door body 200 to move, so as to realize closing or opening the door hole 130. Since the two plug door bodies 200 are oppositely arranged, the driving assembly 300 drives the two plug door bodies 200 to move in opposite directions. The external force can be a motor.

[0032] In the above structure, the two plug door bodies 200 are oppositely arranged, and the plug door body 200 is driven to move by the structure of the lead screw 310 and the moving block 320, so as to improve the stability and accuracy of the movement.

[0033] In addition, in order to further save space and improve the compactness of the structure of the device, the axis of the pull rod 330 is consistent with the axis of the lead screw 310, a containing groove extending along the axial direction of the pull rod 330 is arranged in the pull rod 330, part of the lead screw 310 can extend into the containing groove during the movement of the moving block 320 and the pull rod 330 driven by the lead screw 310, so as to save space and protect the lead screw 310, and the matched connection of the lead screw 310 and the pull rod 330 plays a guiding and limiting role during the movement of the plug door body 200.

[0034] Specifically, the first limiting block 340 is arranged on the pull rod 330, and the first limiting block 340 can be a ring structure and is arranged in the circumferential direction of the pull rod 330. A second limiting block 140 is arranged at a corresponding position on the plug-in door shell 100. When the lead screw 310 drives the moving block 320 and the pull rod 330 to move to open the door hole 130, the first limiting block 340 on the pull rod 330 abuts against the second limiting block 140 when the pull rod 330 moves to a predetermined position, thereby limiting the continuous movement of the pull rod 330, effectively avoiding the continuous rotation of the lead screw 310 and the easy occurrence of the lead screw 310 being stuck, and improving safety.

[0035] In addition, as shown in Figure 3 、 4 , the plug-in door body 200 is provided with a guide wheel 210 at both ends in the direction perpendicular to the moving direction of the plug-in door body 200. The plug-in door shell 100 is provided with a sliding groove 150 at opposite ends. The guide wheel 210 is connected with the sliding groove 150 in a matched mode, and the guide wheel 210 can move in the sliding groove 150.

[0036] In the embodiment, the guide wheel 210 is arranged at both ends of the plug-in door body 200 in the length direction of the plug-in door body 200. The axial direction of the guide wheel 210 is the thickness direction of the plug-in door body 200, that is, the vertical direction. Correspondingly, the plug-in door shell 100 is provided with the sliding groove 150 at both sides in the width direction of the plug-in door shell 100. The extension direction of the sliding groove 150 is the length direction of the plug-in door shell 100. The guide wheel 210 is connected with the sliding groove 150 in a matched mode. When the pull rod 330 drives the plug-in door body 200 to move, the guide wheel 210 rolls in the sliding groove 150. Therefore, the smoothness of the movement of the plug-in door body 200 is improved, and the movement of the plug-in door body 200 is guided and limited. Through the contact between the guide wheel 210 and the plug-in door shell 100, the phenomenon that the plug-in door body 200 is easily deviated in the movement process due to the accumulation of soot on the side of the plug-in door body 200 is effectively avoided.

[0037] In the specific structure of the plug-in door shell 100, as shown in Figure 2 、 3 , the plug-in door shell 100 is provided with a fixed beam 160. The fixed beam 160 extends in the direction perpendicular to the moving direction of the plug-in door body 200. The fixed beam 160 is arranged between the two plug-in door bodies 200. The opposite ends of the fixed beam 160 are provided with receiving grooves. At least part of the plug-in door body 200 is inserted into the receiving groove in the state that the plug-in door body 200 closes the door hole 130. The receiving groove is provided with a first sealing strip 161. The first sealing strip 161 is in movable sealing with the plug-in door body 200. The plug-in door shell 100 is provided with a pressing plate 170 along the circumference of the door hole 130. The pressing plate 170 is provided with a second sealing strip 171 between the pressing plate 170 and the plug-in door body 200. The second sealing strip 171 is in movable sealing with the plug-in door body 200.

[0038] In the embodiment, the plug door housing 100 is provided with a fixed beam 160 at a position in the middle of the door hole 130, the fixed beam 160 extends along the width direction of the plug door housing 100, and a receiving groove for inserting the plug door body 200 is arranged on both sides of the fixed beam 160, wherein when it is needed to close the door hole 130, the two plug door bodies 200 are driven to move relatively, so that part of the plug door body 200 is inserted into the receiving groove, and the closing of the door hole 130 is completed. In addition, a first sealing strip 161 is arranged on the inner wall of the receiving groove, and when the plug door body 200 is inserted into the receiving groove, the first sealing strip 161 abuts against and seals the plug door body 200. By arranging the fixed beam 160, the structural strength of the plug door housing 100 is further improved, and by arranging the receiving groove and the first sealing strip 161 on the fixed beam 160, the sealing performance in the state of closing the door hole 130 is improved, and the escape of smoke is effectively avoided.

[0039] More specifically, a pressing plate 170 is arranged on the plug door housing 100 along the door circumference, the pressing plate 170 extends towards the door hole 130 and covers the upper part of the plug door body 200, and a second sealing strip 171 is arranged between the pressing plate 170 and the plug door body 200, when the plug door body 200 moves, the plug door body 200 abuts against and seals the second sealing strip 171. By arranging the pressing plate 170 on the circumference of the door hole 130, the path for the escape of smoke is increased, and by arranging the sealing strip, the sealing effect is further improved.

[0040] In addition, as shown in Figure 2 , 3 The plug door housing 100 is provided with a pressing wheel 180 at both ends along the direction perpendicular to the moving direction of the plug door body 200, and the plug door body 200 is provided with a slope block 220 at both ends along the direction perpendicular to the moving direction of the plug door body 200, and in the state of closing the door hole 130 by the plug door body 200, the pressing wheel 180 abuts against and presses the slope block 220.

[0041] In the embodiment, the upper end surface of the sliding door body 200 on both sides along the length direction is further provided with a slope block 220, which can be an elastic structure, sequentially having a first slope surface, a top surface and a second slope surface, wherein the slope block 220 extends along the length direction of the sliding door shell 100, the first slope surface and the second slope surface are opposite in inclination direction, and a pressure roller 180 is further arranged at the corresponding position of the sliding door shell 100, which is axially along the length direction of the sliding door body 200. During the movement of the sliding door body 200, the pressure roller 180 contacts the slope block 220. When the sliding door body 200 moves to close the door hole 130, the pressure roller 180 gradually contacts the second slope surface and moves to the top surface to be pressed, thereby improving the stability of the sliding door body 200 in the closed state of the door hole 130, and avoiding the shaking phenomenon caused by the impact of smoke on the sliding door body 200. In addition, two slope blocks 220 can be arranged on one side of the sliding door body 200, and two pressure rollers 180 are correspondingly arranged. The two slope blocks 220 are arranged at intervals, so that the pressure roller 180 and the slope block 220 are in contact and pressed at two positions of the closed state and the open state, further ensuring the stability of the sliding door body 200.

[0042] More specifically, the first end surface is provided with a first partition plate 111 along the circumference of the door hole 130, the first partition plate 111 is provided with a first reverse flange 112 at the end away from the first end surface, the first reverse flange 112 is sealingly connected with the gas outlet end of the boiler, and the second end surface is provided with a second partition plate 121 along the circumference of the door hole 130, the second partition plate 121 is provided with a second reverse flange 122 at the end away from the second end surface, and the second reverse flange 122 is sealingly connected with the gas inlet end of the flue gas desulfurization mechanism.

[0043] In the embodiment, the first end surface is provided with a first partition plate 111, wherein the first partition plate 111 is arranged around the circumference of the door hole 130, and the height direction of the partition plate is the vertical direction. The first reverse flange 112 is arranged at the bottom of the first partition plate 111. The second end surface is provided with a second partition plate 121, the second partition plate 121 is also arranged around the circumference of the door hole 130, and the height direction of the partition plate is the vertical direction. The second reverse flange 122 is arranged at the top of the second partition plate 121. The first partition plate 111 and the second partition plate 121 are oppositely arranged. During installation, the first reverse flange 112 of the first partition plate 111 is sealingly connected with the flange of the gas outlet end of the boiler, and the second reverse flange 122 of the second partition plate 121 is sealingly connected with the flange of the gas inlet end of the flue gas desulfurization mechanism. By arranging the flange structure connection, it is convenient for installation and disassembly, and subsequent maintenance.

[0044] In the above structure, the first partition plate 111, the first reverse flange 112, the second partition plate 121, the second reverse flange 122 and the fixing beam 160 can be made of 2205 stainless steel material, which is not easy to deform and corrode under a large temperature difference, and in addition, the first sealing strip 161 and the second sealing strip 171 are synthetic fiber packing structures, which have high sealing performance and wear resistance.

[0045] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those of ordinary skill in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A flue damper gate device installed between a boiler and a flue gas desulfurization mechanism, characterized in that, The application relates to a plug door casing, which is provided with oppositely arranged first and second end faces and a door hole penetrating through the first and second end faces, the first end face is sealingly connected with the air outlet end of a boiler, the second end face is sealingly connected with the air inlet end of a flue gas desulfurization mechanism, and at least two plug door bodies are movably connected with the plug door casing, the two plug door bodies are connected with a driving mechanism, and the driving mechanism is used for driving the two plug door bodies to move on the plug door casing so as to jointly close or open the door hole.

2. A flue damper door assembly according to claim 1, wherein, The two plug door bodies are oppositely arranged, the driving mechanism comprises two driving assemblies which are identical in structure and are connected with the two plug door bodies in one-to-one correspondence, the driving assembly is provided with a lead screw, a moving block and a pull rod, the moving block is movably connected with the lead screw, one end of the pull rod is fixedly connected with the moving block, and the other end of the pull rod is fixedly connected with the plug door body; the lead screw is driven to rotate around its own axis by external force so as to drive the moving block to move along the axial direction of the lead screw, and then drive the pull rod and the plug door body to move, and the moving directions of the two plug door bodies are opposite.

3. A flue damper door assembly according to claim 2, wherein, The pull rod is provided with an accommodating groove which can accommodate the lead screw along the axial direction of the pull rod, and the axial direction of the pull rod is consistent with the axial direction of the lead screw.

4. A flue damper door assembly according to claim 3, wherein, The pull rod is provided with a first limiting block along the circumferential direction of the pull rod, the plug door casing is provided with a second limiting block, and the first limiting block and the second limiting block abut against each other during the movement of the pull rod so as to limit the movement of the pull rod.

5. The flue damper door apparatus of claim 2, wherein, The plug door body is provided with a guide wheel at both ends which are perpendicular to the moving direction of the plug door body, the plug door casing is provided with a sliding groove at opposite ends, the guide wheel is movably connected with the sliding groove, and the guide wheel can move in the sliding groove.

6. The flue damper door apparatus of claim 2, wherein, The plug door casing is provided with a fixed beam which extends along the direction perpendicular to the moving direction of the plug door body, the fixed beam is arranged between the two plug door bodies, opposite ends of the fixed beam are provided with receiving grooves, at least part of the plug door body is inserted into the receiving groove in the state that the plug door body closes the door hole, the receiving groove is provided with a first sealing strip, and the first sealing strip movably seals the plug door body.

7. The flue damper door apparatus of claim 2, wherein, The plug door casing is provided with a pressing plate along the periphery of the door hole, a second sealing strip is arranged between the pressing plate and the plug door body, and the second sealing strip movably seals the plug door body.

8. A flue damper door assembly according to claim 7, wherein, The plug door casing is provided with a pressing wheel at both ends which are perpendicular to the moving direction of the plug door body, and the plug door body is provided with an inclined block at both ends which are perpendicular to the moving direction of the plug door body; the pressing wheel abuts against and presses the inclined block in the state that the plug door body closes the door hole.

9. The flue damper door apparatus of claim 1, wherein, The first end surface is provided with a first partition plate along the periphery of the door hole, one end of the first partition plate away from the first end surface is provided with a first reverse flange part, the first reverse flange part is in sealing connection with the gas outlet end of the boiler, the second end surface is provided with a second partition plate along the periphery of the door hole, one end of the second partition plate away from the second end surface is provided with a second reverse flange part, and the second reverse flange part is in sealing connection with the gas inlet end of the flue gas desulfurization mechanism.

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