A positive pressure seal for a flue gas jacket

Abstract

The application discloses a positive pressure sealing structure for a flue gas jacket, which comprises a tensioning rope and a plurality of sealing assemblies, the sealing assemblies are sequentially connected in series and distributed in a ring shape by the tensioning rope, the sealing assembly comprises a connecting plate, a U-shaped groove and a graphite block, the connecting plate is provided with a connecting ring for connecting the tensioning rope in series at the top, the U-shaped groove is welded at the end of the connecting plate, and the graphite block is arranged in the U-shaped groove and fixed by a bolt; the graphite block is in a Z-shaped form, wedge-shaped grooves are formed at both ends of the graphite block, the graphite blocks are installed in the wedge-shaped grooves in a plug-in mode, and form wedge-shaped slots, high-temperature-resistant rubber blocks are embedded in the wedge-shaped slots, and the graphite blocks and the high-temperature-resistant rubber blocks form a complete sealing ring. The sealing structure has good sealing effect, no obvious leakage channel, and can realize the sealing of the flue gas pressure in the jacket within 1000 Pa.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of external heating rotary furnace equipment, and particularly relates to a positive pressure sealing structure for a flue gas jacket. BACKGROUND

[0002] The rotary furnace is a device for material drying, reaction and other operations, and is widely used in chemical, metallurgical, building material and food industries. According to whether the heat carrier medium directly contacts with the material, the rotary furnace is divided into two types of direct heat transfer type and indirect heat transfer type. The indirect heat transfer type rotary furnace usually has a jacket arranged outside the rotary furnace body, and high-temperature hot flue gas is conveyed in the jacket to provide heat for the reaction or drying process of the material in the furnace. In the working state, the rotary furnace cylinder is rotating, while the outer jacket is usually stationary and fixed due to the need for external pipeline connection. Therefore, a sealing structure needs to be arranged between the fixed outer heating jacket and the rotating furnace body. The sealing structure is a key component in the rotary furnace outer jacket and is also a difficulty in the design of the rotary furnace outer jacket. Because the sealing structure needs to realize the sealing between the moving and stationary parts, it also needs to withstand the high temperature of 500-900 DEG C of the hot flue gas, adapt to the thermal expansion difference between the furnace body and the jacket, and have certain wear resistance.

[0003] At present, the sealing structures commonly used for the rotary furnace outer jacket mainly include labyrinth type, fish scale type and spring-pressed graphite block type. These sealing forms have certain defects, for example, the labyrinth type can only be used for sealing of non-high-temperature medium in the jacket; the fish scale type has poor sealing effect, the fish scale cannot completely fit between the furnace body, and there is a small amount of leakage; and the spring-pressed graphite block type is easy to soften and fail under high temperature. SUMMARY

[0004] The present application aims to provide a positive pressure sealing structure for a flue gas jacket, which has good sealing effect, no obvious leakage channel, and can realize sealing of the flue gas pressure in the jacket within 1000 Pa.

[0005] To achieve the above-mentioned purpose, the present application provides a positive pressure sealing structure for a flue gas jacket, which comprises a tensioning rope and a plurality of sealing assemblies. The plurality of sealing assemblies are connected in series by the tensioning rope and arranged in a ring shape. The sealing assembly comprises a connecting plate, a U-shaped groove and a graphite block. The connecting plate is provided with a connecting ring for connecting the tensioning rope in series. The U-shaped groove is welded to the end of the connecting plate. The graphite block is arranged in the U-shaped groove and fixed by a bolt.

[0006] The graphite block is in Z shape, and wedge-shaped grooves are formed at both ends. The adjacent graphite blocks are installed by inserting the wedge-shaped grooves and form a wedge-shaped groove. A high-temperature-resistant rubber block is embedded in the wedge-shaped groove. The graphite block and the high-temperature-resistant rubber block form a complete sealing ring.

[0007] As a further scheme of the present application: the graphite block is centrally provided with a semicircular groove away from the end face of the connecting plate, the semicircular grooves on all the graphite blocks are butted against each other to form a complete annular groove, and part of the graphite blocks are provided with oil injection holes communicating with the semicircular grooves from the top.

[0008] As a further scheme of the present application: the connecting plate comprises a pressing plate and a flexible plate, the pressing plate is located above the flexible plate and corresponds one by one, the connecting ring is fixed on the pressing plate, the U-shaped groove is fixed on the flexible plate, and a high-temperature-resistant skin covering all the flexible plates, U-shaped grooves and graphite blocks is arranged between the pressing plate and the flexible plate, and the high-temperature-resistant skin connects the flexible plate and the pressing plate through high-temperature-resistant glue.

[0009] Compared with the prior art, the present application has the following beneficial effects:

[0010] The graphite blocks are processed into Z-shaped type and are inserted and installed, meanwhile, the high-temperature-resistant rubber blocks are embedded in the wedge-shaped grooves formed at the insertion positions of the adjacent graphite blocks, the soft rubber blocks block the axial leakage gaps of the sealing structure, and a certain amount of furnace body jump can be used;

[0011] The semicircular grooves are arranged on the graphite blocks, all the graphite blocks are inserted and installed to form an annular lubricating oil groove, lubricating oil is injected through the oil injection holes communicating with the semicircular grooves during operation, an oil film seal is formed on the sealing surface, and the service life of the graphite blocks is improved;

[0012] The whole-piece high-temperature-resistant skin is attached to the flexible plate through high-temperature-resistant glue, the radial leakage gaps of the sealing structure are blocked, therefore, the sealing effect of the sealing structure is good, and the sealing of the flue gas pressure within 1000 Pa can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a structural schematic view of a positive pressure sealing structure for a flue gas jacket.

[0014] Figure 2 It is a structural schematic view of a graphite block.

[0015] Figure 3 It is a bottom view structural schematic view of a graphite block.

[0016] Figure 4 It is a structural schematic view of the insertion position of adjacent graphite blocks.

[0017] In the figure: 1, rotary furnace outer jacket, 2, conical flange, 3, connecting plate, 4, high-temperature-resistant skin, 5, connecting ring, 6, oil injection pipe, 7, tensioning rope, 8, U-shaped groove, 9, graphite block, 10, wear-resistant ring, 11, oil injection hole, 12, semicircular groove, 13, rotary furnace body, 14, wedge-shaped groove, 15, wedge-shaped groove, 16, high-temperature-resistant rubber block;

[0018] 3.1, a pressing plate, 3.2, a flexible plate. DETAILED DESCRIPTION

[0019] The application is further described below with reference to the accompanying drawings.

[0020] As shown in Figure 1 , Figure 3 and Figure 4 , a positive pressure sealing structure for a flue gas jacket, comprising a tensioning rope 7 and a plurality of sealing assemblies, the plurality of sealing assemblies are sequentially connected in series by the tensioning rope 7 and are annularly distributed, installed on the conical flange 2 at the end of the outer jacket 1 of the rotary furnace, and placed on the outer surface of the wear-resistant ring 10 of the rotary furnace body; since the sealing structure is stationary with the outer jacket, the sealing surface of the positive pressure sealing structure always maintains frictional contact with the outer surface of the rotating wear-resistant ring 10; the sealing assembly comprises a connecting plate 3, a U-shaped groove 8 and a graphite block 9, the connecting plate 3 is provided with a connecting ring 5 for the series connection of the tensioning rope 7 above, the U-shaped groove 8 is welded at the end of the connecting plate 3, and the graphite block 9 is arranged in the U-shaped groove 8 and fixed by bolts;

[0021] The graphite block 9 is Z-shaped, and the two ends are processed with wedge-shaped grooves 14, the adjacent graphite blocks 9 are installed by inserting the wedge-shaped grooves 14, and the wedge-shaped grooves 14 form a wedge-shaped groove 15, the high-temperature-resistant rubber block 16 is embedded in the wedge-shaped groove 15, and the graphite block 9 cooperates with the high-temperature-resistant rubber block 16 to form a complete sealing ring, and the contact force between the sealing assembly and the wear-resistant ring 10 is adjusted by the tensioning force of the tensioning rope 7, so as to achieve the effect of adjusting the sealing.

[0022] As shown in Figure 1 and Figure 3 , in order to further improve the sealing effect of the graphite block 9, preferably, a semicircular groove 12 is arranged in the middle of the end face of the graphite block 9 away from the connecting plate 3, the semicircular grooves 12 on all the graphite blocks 9 are butt jointed to form a complete annular groove, and part of the graphite blocks 9 are provided with oil injection holes 11 communicating with the semicircular grooves 12 from the top, and lubricating oil is injected into the oil injection holes 11 through the oil injection pipe 6 during operation, which can be introduced into the semicircular grooves 12 to form an oil film seal on the sealing surface, and at the same time improve the frictional contact between the graphite block 9 and the wear-resistant ring 10, thereby prolonging the service life of the graphite block 9.

[0023] As shown in Figure 1As shown, in order to improve the radial sealing effect, preferably, the connecting plate 3 comprises a pressing plate 3.1 and a flexible plate 3.2, the pressing plate 3.1 is located above the flexible plate 3.2 and one-to-one corresponding, the connecting ring 5 is fixed on the pressing plate 3.1, the U-shaped groove 8 is fixed on the flexible plate 3.2, and the high-temperature-resistant skin 4 covering the entire flexible plate 3.2, U-shaped groove 8 and graphite block 9 is arranged between the pressing plate 3.1 and the flexible plate 3.2, the high-temperature-resistant skin 4 is connected with the flexible plate 3.2 through high-temperature-resistant glue, and the high-temperature-resistant skin 4 is used to block the radial sealing gap, and the whole high-temperature-resistant skin 4 is matched with the divided pressing plate 3.1 and the flexible plate 3.2, which can stably connect the high-temperature-resistant skin 4 and facilitate assembly and installation.

[0024] The working process of the present application: according to the size of the diameter of the rotary furnace outer jacket 1, process the appropriate size and number of sealing assemblies, distribute along the circumferential direction and connect into one body by using the tensioning rope 7, the one end of the connecting plate 3 connected to the rotary furnace outer jacket 1 is higher than the one end of the connecting plate 3 connected to the U-shaped groove 8, which facilitates the adjustment of the fitting force between the sealing assembly and the wear-resistant ring 10 by using the tensioning force of the tensioning rope 7.

[0025] When assembling and using, first, the flexible plate 3.2 cooperates with the U-shaped groove 8 to fix the graphite block 9, the adjacent graphite blocks 9 are inserted and combined by using the wedge-shaped groove 14, and the high-temperature-resistant rubber block 16 is filled in the wedge-shaped groove 15 formed by the wedge-shaped groove 14, to form a complete sealing ring, then one end of the flexible plate 3.2 is fixed on the conical flange 2, high-temperature-resistant glue is brushed on the flexible plate 3.2, and the whole high-temperature-resistant skin 4 covering all the flexible plate 3.2, U-shaped groove 8 and graphite block 9 is bonded, then the divided pressing plate 3.1 corresponding to the flexible plate 3.2 is fixed, and the tensioning force is adjusted by using the tensioning rope 7 to adjust the fitting force of the graphite block 9 and the wear-resistant ring 10, finally, the lubricating oil is injected into the oil injection hole 11 through the oil injection pipe 6, so that the lubricating oil can be introduced into the semicircular groove 12 to form an oil film sealing effect, and during the working process, only the lubricating oil needs to be supplemented through the oil injection hole 11 by using the oil injection pipe 6.

Claims

1. A positive pressure sealing structure for a flue gas jacket, comprising a tensioning rope (7) and a plurality of sealing assemblies, the plurality of sealing assemblies being arranged in a ring shape in series by the tensioning rope (7), mounted on a conical flange (2) at an end of an outer jacket (1) of a rotary furnace, and placed on an outer surface of a wear-resistant ring (10) of a rotary furnace body, characterized in that, The sealing assembly comprises a connecting plate (3), a U-shaped groove (8) and a graphite block (9), the connecting plate (3) is provided with a connecting ring (5) for connecting the tensioning rope (7) in series, the U-shaped groove (8) is welded at the end of the connecting plate (3), and the graphite block (9) is arranged in the U-shaped groove (8) and fixed by bolts; The graphite block (9) is in Z shape, and wedge-shaped grooves (14) are formed at both ends, the adjacent graphite blocks (9) are installed by inserting the wedge-shaped grooves (14) and form wedge-shaped slots (15), the high-temperature-resistant rubber blocks (16) are embedded in the wedge-shaped slots (15), and the graphite blocks (9) and the high-temperature-resistant rubber blocks (16) form complete sealing rings; The graphite block (9) is provided with a semicircular groove (12) in the middle of the end face away from the connecting plate (3), the semicircular grooves (12) on all the graphite blocks (9) are butted to form a complete annular groove, and part of the graphite blocks (9) are provided with oil injection holes (11) communicating with the semicircular grooves (12) from the top; The connecting plate (3) comprises a pressing plate (3.1) and a flexible plate (3.2), the pressing plate (3.1) is located above the flexible plate (3.2) and corresponds to the flexible plate (3.2) one by one, the connecting ring (5) is fixed on the pressing plate (3.1), the U-shaped groove (8) is fixed on the flexible plate (3.2), and the high-temperature-resistant skin (4) covering all the flexible plates (3.2), the U-shaped grooves (8) and the graphite blocks (9) is arranged between the pressing plate (3.1) and the flexible plate (3.2), and the high-temperature-resistant skin (4) is connected with the flexible plate (3.2) by high-temperature-resistant glue.

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