Sealing device for connecting boiler and dry bottom hopper

Abstract

The utility model discloses a sealing device for connecting a boiler and a dry bottom hopper, and relates to the technical field of thermal power generation equipment. The device is characterized by comprising an upper connecting plate, the upper connecting plate is welded to a wedge block below a water cooling wall in the boiler, and an inserting plate is fixedly arranged on the outer side of the upper connecting plate; an angle iron flange is coaxially arranged on the upper side of one end, far away from the inserting plate, of the upper ring plate; lower supporting channel steel is arranged below the upper annular plate at intervals, and a skin is arranged between the angle iron flange and the lower supporting channel steel. A non-metal heat insulation assembly is arranged in the space among the lower supporting channel steel, the upper annular plate and the skin and can absorb the deformation of the boiler in the vertical direction when the boiler is heated to expand. The sealing device adapts to deformation generated by the boiler or the dry bottom hopper through deformation of the sealing device, and compared with a water seal tank mode in the prior art, the problems of dust accumulation, corrosion and the like existing in the using process of the water seal tank can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of thermal power generation equipment, and in particular to a sealing device for connecting a boiler and a cold ash hopper. Background Art

[0002] At the bottom of the boiler in a thermal power plant, a water seal groove is usually used to connect the top of the cold ash hopper below it. In actual use, a large amount of slag and ash will fall into the water seal groove after a period of use. The accumulated slag and ash will block the water seal groove after accumulating to a certain extent, causing sewage overflow. The slag and ash cannot be eliminated during the operation of the boiler, which seriously pollutes the environment in which the boiler operates. In addition, the accumulation of slag and ash in the water seal groove will hinder the movement of the water seal plug plate due to the thermal expansion of the boiler during the operation of the equipment. This will also easily cause damage to the internal equipment due to the inability of the water seal plug plate to release the expansion of the furnace body. Since the water seal groove uses water to seal the seam, the water seal plug plate and the water seal groove are in contact with water containing slag and ash for a long time, and they will deform due to corrosion. When the deformation is serious or even damaged, the sealing effect cannot be achieved. Utility Model Content

[0003] The present application provides a sealing device for connecting a boiler and a cold ash hopper, which can effectively solve the problems existing in the actual use of the existing water seal tank.

[0004] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0005] A sealing device for connecting a boiler and a cold ash hopper, comprising an upper connecting plate, the upper connecting plate being welded to a wedge block below a water-cooled wall in the boiler, a plug plate being fixedly arranged on the outer side of the upper connecting plate, and the lower end of the plug plate extending toward the cold ash hopper below;

[0006] An upper ring plate is sleeved on the outer side of the middle position of the plug plate and the two are fixedly connected, an angle iron flange is coaxially arranged on the upper side of one end of the upper ring plate away from the plug plate, and the lower side of the angle iron flange is welded to the upper ring plate;

[0007] A lower supporting channel steel is provided below the upper ring plate at intervals, the lower supporting channel steel is welded to the outer side wall of the upper end of the cold ash hopper, and a skin is provided between the angle iron flange and the lower supporting channel steel;

[0008] A non-metallic heat insulation component is provided in the space between the lower supporting channel steel, the upper ring plate and the skin, and the non-metallic heat insulation component can absorb the deformation of the boiler in the vertical direction when the boiler expands due to heat.

[0009] Furthermore, the non-metallic heat insulation component includes a stainless steel wire mesh, the upper end of the stainless steel wire mesh is fixedly connected to the upper ring plate, the lower end of the stainless steel wire mesh is fixedly connected to the lower vertical plate, and the lower vertical plate is fixedly mounted on the lower supporting channel steel;

[0010] The stainless steel wire mesh, the upper ring plate, the lower support channel steel and the skin can together form a receiving cavity, the receiving cavity is filled with needle felt and fiber cotton, the fiber cotton is close to the skin in the receiving cavity, and the needle felt is close to the fiber cotton and is located on the side of the fiber cotton away from the skin;

[0011] The upper and lower ends of the needle felt and the fiber cotton are respectively fixed to the upper ring plate and the lower vertical plate through a fixing unit.

[0012] Furthermore, the fixing unit comprises a stainless steel nail rod, one end of which is fixedly connected to the upper ring plate or the lower vertical plate, and the other end of which is provided with a locking plate, which is embedded in the fiber cotton.

[0013] Furthermore, a metal isolation net is provided between the needle-punched felt and the fiber cotton, and the upper and lower ends of the metal isolation net are fixedly connected to the upper ring plate and the lower supporting channel steel respectively.

[0014] Furthermore, a metal strip is fixedly connected to both the upper and lower ends of the skin, and the metal strip above the skin and the angle iron flange, as well as the metal strip below the skin and the lower supporting channel steel are fixedly connected by bolts and nuts.

[0015] Furthermore, the skin is made of glass fiber cloth.

[0016] Furthermore, a plurality of reinforcing ribs are welded between the upper ring plate and the insert plate, and the plurality of reinforcing ribs are evenly arranged along the circumference of the upper ring plate.

[0017] Furthermore, a rubber insulation belt is provided between the metal pressure strip and the angle iron flange or between the lower supporting channel steels.

[0018] In summary, the present application includes at least one of the following beneficial technical effects:

[0019] The present application sets a non-metallic insulation component between the boiler and the cold ash hopper to connect the two. The non-metallic insulation component can not only play a sealing role between the boiler furnace bottom and the cold ash hopper, but also because of its elasticity, when the boiler or the cold ash hopper is deformed, the non-metallic insulation component with good heat resistance can adapt to the deformation of the boiler or the cold ash hopper through its own deformation. Compared with the method of setting a water seal groove between the boiler furnace bottom and the cold ash hopper in the prior art, the sealing device of the present application does not need to inject water into the groove, thereby avoiding the problems of dust accumulation and corrosion in the water seal groove during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a structural diagram of a water seal tank installed between a boiler and a cold ash hopper in the prior art;

[0022] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0023] Figure 3 It is a structural schematic diagram of the sealing device of the present application installed between the boiler and the cold ash hopper;

[0024] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 5 yes Figure 3 Cross-sectional view at CC.

[0026] Figure numerals: 1. upper connecting plate; 2. boiler; 3. plug plate; 4. cold ash hopper; 5. upper ring plate; 6. angle iron flange; 7. lower supporting channel steel; 8. skin; 9. non-metallic thermal insulation component; 91. stainless steel wire mesh; 92. lower vertical plate; 93. needle-punched felt; 94. fiber cotton; 95. fixing unit; 951. stainless steel nail rod; 952. locking plate; 10. metal isolation net; 11. metal pressure strip; 12. reinforcing rib; 13. rubber insulation belt; 14. sealing groove; 15. ash baffle; 16. stainless steel baffle. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work also fall within the scope of protection of the present application.

[0028] like Figure 3 and Figure 4 As shown, a sealing device for connecting a boiler and a cold ash hopper disclosed in the present application comprises an upper connecting plate 1, wherein the upper connecting plate 1 is welded to a wedge block below a water-cooled wall in a boiler 2, a plug plate 3 is fixedly arranged on the outer side of the upper connecting plate 1, and the lower end of the plug plate 3 extends toward the direction of the cold ash hopper 4 below; an upper ring plate 5 is sleeved on the outer side of the middle position of the plug plate 3 and the two are fixedly connected, an angle iron flange 6 is coaxially arranged on the upper side of the upper ring plate 5 away from the plug plate 3, and the lower side of the angle iron flange 6 is welded to the upper ring plate 5; lower supporting channel steels 7 are arranged at intervals below the upper ring plate 5, and the lower supporting channel steels 7 are welded to the outer side wall of the upper end of the cold ash hopper 4, and a skin 8 is arranged between the angle iron flange 6 and the lower supporting channel steel 7; a non-metallic heat-insulating component 9 is arranged in the space between the lower supporting channel steel 7, the upper ring plate 5 and the skin 8, and the non-metallic heat-insulating component 9 can absorb the deformation of the boiler 2 in the vertical direction when the boiler 2 expands due to heat.

[0029] In the above embodiments, the water-cooled wall installed in the boiler 2 is a part of the boiler, and the actual connection with the sealing device is mainly the wedge block below the water-cooled wall at the bottom of the boiler 2. The wedge blocks connected together below the water-cooled wall are also called water-cooled wall comb plates. Therefore, the complete shape of the boiler 2 is not shown in the drawings of this application. In order to facilitate the understanding of the scheme, only the middle part of the annular water-cooled wall is used to represent the boiler. Whether it is the prior art or the general connection method between the connecting plate and the wedge block in this application, please refer to Figure 3 and Figure 5 The contents of this part are all prior art and will not be elaborated here.

[0030] like Figure 1 and Figure 2In the prior art shown, the sealing groove 14 for holding water in the water seal groove is arranged on the outside of the cold ash hopper 4 and its lower end is fixedly mounted on the lower supporting channel steel 7 on the outside of the cold ash hopper 4. The ash baffle plate 15 is arranged on the inner side of the inner lining of the cold ash hopper 4 and there is a gap between it and the inner surface of the inner lining of the cold ash hopper 4. There is a stainless steel baffle plate 16 in the sealing groove 14. The upper end of the stainless steel baffle plate 16 is connected to the water-cooled wall in the bottom of the boiler 2. Although the lower end of the stainless steel baffle plate 16 is inserted into the sealing groove 14, there is still a certain distance between the lower end and the bottom of the sealing groove 14. The water seal groove is mainly used to effectively prevent air leakage by inserting the stainless steel baffle plate 16 into the water in the sealing groove 14. When the boiler 2 or the cold ash hopper 4 is deformed due to heat, when the positional relationship between the two changes, the stainless steel baffle plate 16 will change the depth of its insertion into the sealing groove 14. Since the boiler 2 and the cold ash hopper 4 may produce radial deformation in addition to vertical deformation, there is a certain distance between the ash baffle 15, the stainless steel baffle 16 and the cold ash hopper 4, so as to avoid the stainless steel baffle 16 or the ash baffle 15 colliding with the cold ash hopper 4 when the boiler 2 or the cold ash hopper 4 is radially deformed. However, the gap will also cause the slag and ash in the boiler 2 to enter the sealing groove 14. When the slag and ash accumulate in the sealing groove 14, it will not only hinder the movement of the water seal plug plate 3 driven by the thermal expansion of the furnace body, but may also overflow the sealing groove 14 with water flow to affect the operating environment of the boiler 2, and the sealing effect of the water seal groove must rely on water. This will cause the water seal groove and the stainless steel baffle 16 to rust and break after long-term use. When the slag and ash enter the sealing groove 14, the sewage generated will even aggravate the corrosion, thereby affecting the sealing effect.

[0031] In the sealing device of the present application, the plug plate 3 is welded to the upper connecting plate 1, and then the upper ring plate 5 is welded on the outer side of the upper connecting plate 1, and a skin 8 is installed between the end of the upper ring plate 5 away from the plug plate 3 and the lower supporting channel steel 7 on the upper part of the cold ash hopper 4, so that a groove-shaped space can be formed at the connection between the boiler 2 and the cold ash hopper 4, and the space can provide necessary installation conditions for the non-metallic thermal insulation component 9, and the upper ends of the non-metallic thermal insulation component 9 and the skin 8 are in close contact with the upper ring plate 5 at the lower end of the boiler 2, and the lower ends of the non-metallic thermal insulation component 9 and the skin 8 are in close contact with the lower supporting channel steel 7, so that the non-metallic thermal insulation component 9 and the skin 8 can well isolate the space at the connection between the boiler 2 and the cold ash hopper 4 from the outside world, thereby preventing air from entering the boiler 2 and affecting the combustion effect inside the boiler 2. Furthermore, the non-metallic heat-insulating component 9 has good elasticity, so when the connection between the boiler 2 and the cold ash hopper 4 is deformed, the non-metallic heat-insulating component 9 can absorb the deformation between the boiler 2 and the cold ash hopper 4 through its own deformation, so that even if the deformation of the boiler 2 and the cold ash hopper 4 is inconsistent, no gap will be generated at the connection. Compared with the water seal groove structure in the prior art, the sealing device of the present application does not need to inject water into the sealing groove 14, so it can effectively avoid the problems of dust accumulation and corrosion of the water seal groove structure during use.

[0032] Furthermore, if Figure 3 and Figure 4 As shown, the non-metallic heat insulation component 9 includes a stainless steel wire mesh 91, the upper end of the stainless steel wire mesh 91 is fixedly connected to the upper ring plate 5, the lower end of the stainless steel wire mesh 91 is fixedly connected to the lower vertical plate 92, and the lower vertical plate 92 is fixedly mounted on the lower supporting channel steel 7;

[0033] The stainless steel wire mesh 91, the upper ring plate 5, the lower support channel steel 7 and the skin 8 can together form a receiving cavity, and the receiving cavity is filled with needle felt 93 and fiber cotton 94. The fiber cotton 94 is close to the skin 8 in the receiving cavity, and the needle felt 93 is close to the fiber cotton 94 and is located on the side of the fiber cotton 94 away from the skin 8;

[0034] The upper and lower ends of the needle felt 93 and the fiber cotton 94 are fixed to the upper ring plate 5 and the lower vertical plate 92 respectively through a fixing unit 95 .

[0035] In the above embodiments, after the needle felt 93 and the limiting cotton are filled in the groove surrounded by the upper ring plate 5, the lower supporting channel steel 7 and the skin 8, the upper and lower ends of the stainless steel wire mesh 91 are respectively welded to the upper ring plate 5 and the lower vertical plate 92 close to the skin 8, so that a closed accommodating cavity can be formed, thereby preventing the needle felt 93 and the fiber cotton 94 from being deformed and displaced and falling into the cold ash hopper 4 during use. Among them, the needle-punched felt 93 of the present application can preferably be a glass fiber needle-punched felt 93, which is arranged on the side close to the stainless steel wire mesh 91, because the glass fiber needle-punched felt 93 not only has the advantages of glass fiber fabric such as high temperature resistance, corrosion resistance, dimensional stability, and high strength, but also has special advantages such as low price, high temperature resistance, and low thermal conductivity. In this way, the needle-punched felt 93 can not only adapt well to the high temperature environment generated by the boiler 2 and the cold ash hopper 4 during use, but also effectively block the high temperature, thereby reducing the damage of the high temperature to the outer fiber cotton 94 and the skin 8, and the glass fiber needle-punched felt 93 also has certain filtering performance, which can also prevent the dust in the boiler 2 and the cold ash hopper 4 from continuing to penetrate into the fiber cotton 94, affecting the use of the fiber cotton 94. The fiber cotton 94 arranged in the accommodating cavity near the side of the skin 8 of the present application can be ceramic fiber cotton 94. This type of fiber cotton 94 is a high-efficiency thermal insulation material, which has the characteristics of light weight, high strength, anti-oxidation, low thermal conductivity, good softness, corrosion resistance, small heat capacity and sound insulation. It cooperates with the needle-punched felt 93 to not only effectively block the heat in the boiler 2 and the cold ash hopper 4, but also use its own flexibility to timely adapt to the changes in the position between the boiler 2 and the cold ash hopper 4.

[0036] Furthermore, if Figure 3 and Figure 4 As shown, the fixing unit 95 includes a stainless steel nail rod 951 , one end of which is fixedly connected to the upper ring plate 5 or the lower vertical plate 92 , and the other end of the stainless steel nail rod 951 is provided with a locking plate 952 , which is embedded in the fiber cotton 94 .

[0037] In the above embodiment, one end of the stainless steel nail rod 951 near the upper ring plate 5 is welded to the upper ring plate 5, and one end of the stainless steel nail rod 951 passes through the needle felt 93 and is inserted into the fiber cotton 94, and one end of the stainless steel nail rod 951 located in the fiber cotton 94 is connected to a locking piece 952, and the locking piece 952 is embedded in the fiber cotton 94, thereby increasing the contact area between the stainless steel nail rod 951 and the fiber cotton 94, so that the stainless steel nail rod 951 can fix the fiber cotton 94 and the upper ends of the needle felt 93 together through the locking piece 952. One end of the stainless steel nail rod 951 at the lower ends of the needle felt 93 and the fiber cotton 94 is welded to the lower vertical plate 92, and the other end of the stainless steel nail rod 951 passes through the needle felt 93 and is also inserted into the fiber cotton 94 through the locking piece 952, thereby fixing the lower ends of the needle felt 93 and the fiber cotton 94 on the lower vertical plate 92.

[0038] The fiber cotton 94 and the needle felt 93 of the present application are both arranged along the circumference of the connection between the boiler 2 and the cold ash hopper 4. Therefore, the upper and lower ends of the fiber cotton 94 and the needle felt 93 are evenly provided with a plurality of fixing units 95 along the circumference thereof, and the spacing between the fixing units 95 is 10 cm. In this way, when the fiber cotton 94 and the needle felt 93 fixed by the fixing units 95 are in use, the upper ends of the fiber cotton 94 and the needle felt 93 can stably move with the boiler 2 when the boiler 2 is deformed, and the lower ends of the fiber cotton 94 and the needle felt 93 can stably deform with the cold ash hopper 4 when the cold ash hopper 4 is deformed. The area of ​​the fiber cotton 94 and the needle felt 93 is not fixed because it is located between the upper ring plate 5 and the lower vertical plate 92, and therefore has a certain degree of freedom. In this way, this part of the fiber cotton 94 and the needle felt 93 can absorb the deformation between the boiler 2 and the cold ash hopper 4 by changing its position when the boiler 2 and the cold ash hopper 4 are deformed.

[0039] Furthermore, if Figure 3 and Figure 4 As shown, a metal isolation net 10 is provided between the needle felt 93 and the fiber cotton 94, and the upper and lower ends of the metal isolation net 10 are fixedly connected to the upper ring plate 5 and the lower supporting channel steel 7 respectively.

[0040] In the above embodiments, the metal isolation net 10 arranged between the needle felt 93 and the fiber cotton 94 can separate the needle felt 93 and the fiber cotton 94, making the boundary between the two obvious, preventing the contact areas of the needle felt 93 and the fiber cotton 94 from mixing during use, which is inconvenient for subsequent inspection and maintenance.

[0041] Furthermore, if Figure 3 and Figure 4 As shown, a metal strip 11 is fixedly connected to both the upper and lower ends of the skin 8, and the metal strip 11 above the skin 8 and the angle iron flange 6, as well as the metal strip 11 below the skin 8 and the lower supporting channel steel 7 are fixedly connected by bolts and nuts.

[0042] In the above embodiments, the upper and lower ends of the skin 8 can be fixedly connected with the angle iron flange 6 and the lower supporting angle steel by bolts and nuts through the metal pressure strip 11, which is convenient for workers to quickly install the skin 8.

[0043] Furthermore, the skin 8 is made of glass fiber cloth.

[0044] In the above embodiments, the skin 8 made of glass fiber cloth has good covering function and is suitable as the outer surface of the sealing device. It has strong tensile strength, does not accumulate static electricity on the surface, does not produce dead corners for dirt accumulation, and is easy to clean.

[0045] Furthermore, if Figure 3 and Figure 4As shown, a plurality of reinforcing ribs 12 are welded between the upper ring plate 5 and the insert plate 3 , and the plurality of reinforcing ribs 12 are evenly arranged along the circumference of the upper ring plate 5 .

[0046] In the above embodiments, the reinforcing ribs 12 welded between the upper ring plate 5 and the insert plate 3 can improve the stability of the upper ring plate 5 .

[0047] Furthermore, a rubber insulation belt 13 is provided between the metal pressure strip 11 and the angle iron flange 6 or between the lower supporting channel steels 7 .

[0048] In the above embodiments, the rubber insulation belt 13 can act as a gasket. When the metal strip 11 and the angle iron flange 6 or the lower supporting channel steel 7 are fixed together by bolts and nuts, the gap between them can be sealed to improve the sealing performance of the present application.

[0049] The implementation principle of this embodiment is: when in use, when the boiler 2 and the cold ash hopper 4 are heated and expanded, and the distance between the two joints changes, the needle felt 93, the fiber cotton 94, the skin 8 and the metal mesh will all be deformed accordingly to timely adapt to the change in the distance between the boiler 2 and the cold ash hopper 4, so that even if the boiler 2 and the cold ash hopper 4 are not deformed consistently, no gap will be generated at the joint. Compared with the water seal groove structure in the prior art, the sealing device of the present application does not need to inject water into the sealing groove 14, so it can effectively avoid the problems of dust accumulation and corrosion of the water seal groove structure during use.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealing device for connecting a boiler and a cold ash hopper, characterized in that: It comprises an upper connecting plate (1), the upper connecting plate (1) being welded to a wedge block below a water-cooled wall in a boiler (2), a plug plate (3) being fixedly arranged on the outer side of the upper connecting plate (1), the lower end of the plug plate (3) extending in the direction of a cold ash hopper (4) below; An upper ring plate (5) is sleeved on the outer side of the middle position of the plug plate (3) and the two are fixedly connected, an angle iron flange (6) is coaxially provided on the upper side of one end of the upper ring plate (5) away from the plug plate (3), and the lower side of the angle iron flange (6) is welded to the upper ring plate (5); A lower supporting channel steel (7) is provided at intervals below the upper ring plate (5), the lower supporting channel steel (7) is welded to the outer side wall of the upper end of the cold ash hopper (4), and a skin (8) is provided between the angle iron flange (6) and the lower supporting channel steel (7); A non-metallic heat insulation component (9) is provided in the space between the lower supporting channel steel (7), the upper ring plate (5) and the skin (8), and the non-metallic heat insulation component (9) can absorb the deformation of the boiler (2) in the vertical direction when the boiler (2) expands due to heat.

2. The sealing device for connecting a boiler and a cold ash hopper according to claim 1, characterized in that: The non-metallic heat insulation component (9) comprises a stainless steel wire mesh (91), the upper end of the stainless steel wire mesh (91) is fixedly connected to the upper ring plate (5), the lower end of the stainless steel wire mesh (91) is fixedly connected to the lower vertical plate (92), and the lower vertical plate (92) is fixedly mounted on the lower supporting channel steel (7); The stainless steel wire mesh (91), the upper ring plate (5), the lower support channel steel (7) and the skin (8) can together form a receiving cavity, and the receiving cavity is filled with needle felt (93) and fiber cotton (94), the fiber cotton (94) is located on a side of the receiving cavity close to the skin (8), and the needle felt (93) is close to the fiber cotton (94) and is located on a side of the fiber cotton (94) away from the skin (8); The upper and lower ends of the needle felt (93) and the fiber cotton (94) are fixed to the upper ring plate (5) and the lower vertical plate (92) respectively through a fixing unit (95).

3. The sealing device for connecting a boiler and a cold ash hopper according to claim 2, characterized in that: The fixing unit (95) comprises a stainless steel nail rod (951), one end of which is fixedly connected to the upper ring plate (5) or the lower vertical plate (92), and the other end of which is provided with a locking plate (952), and the locking plate (952) is embedded in the fiber cotton (94).

4. The sealing device for connecting a boiler and a cold ash hopper according to claim 2, characterized in that: A metal isolation net (10) is provided between the needle-punched felt (93) and the fiber cotton (94), and the upper and lower ends of the metal isolation net (10) are fixedly connected to the upper ring plate (5) and the lower supporting channel steel (7) respectively.

5. The sealing device for connecting a boiler and a cold ash hopper according to any one of claims 1 to 4, characterized in that: A metal strip (11) is fixedly connected to both the upper and lower ends of the skin (8); the metal strip (11) above the skin (8) and the angle iron flange (6), and the metal strip (11) below the skin (8) and the lower supporting channel steel (7) are fixedly connected by bolts and nuts.

6. The sealing device for connecting a boiler and a cold ash hopper according to any one of claims 1 to 4, characterized in that: The skin (8) is made of glass fiber cloth.

7. The sealing device for connecting a boiler and a cold ash hopper according to any one of claims 1 to 4, characterized in that: A plurality of reinforcing ribs (12) are welded between the upper ring plate (5) and the insert plate (3), and the plurality of reinforcing ribs (12) are evenly arranged along the circumference of the upper ring plate (5).

8. The sealing device for connecting a boiler and a cold ash hopper according to claim 5, characterized in that: A rubber insulation belt (13) is provided between the metal pressure strip (11) and the angle iron flange (6) or between the lower supporting channel steel (7).

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