Sealing box for multi-row tube bundle at water cooling wall pipe penetrating portion of dry quenching coke boiler

Abstract

The application provides a multi-row pipe bundle sealing box at a pipe penetrating position of a water cooling wall of a dry quenching coke boiler, which comprises a fixed box and a sealing cover, the fixed box is fixedly installed at the pipe penetrating position of the water cooling wall and surrounds the outside of the pipe bundle, a comb plate (5) is arranged in the fixed box, a plurality of comb teeth located between the pipe bundles are arranged on the comb plate (5), a sealing folding plate (3) is further arranged in the fixed box, the sealing cover (2) surrounds the outside of the pipe bundle, one end of the sealing cover (2) is connected to the fixed box, and the other end is welded and fixed to a header, and heat insulation cotton (1) is further filled in the sealing cover (2). The application can guarantee the sealing property and does not affect the deformation and expansion of the pipe bundle, and solves the technical problem of the conflict between thermal expansion and sealing property in the prior art.

Description

Technical Field

[0001] This invention relates to the field of waste heat boiler technology, specifically to a multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall of a dry quenching coke boiler. Background Technology

[0002] Dry quenching coke waste heat boilers utilize high-temperature circulating gas that has absorbed the sensible heat of red-hot coke. This high-temperature circulating gas exchanges heat with the heating medium in the boiler's heating surface, thereby generating steam with rated parameters and quality to supply steam to generators or users. It is a highly efficient and energy-saving waste heat boiler under current environmental protection requirements.

[0003] After passing through the superheater, reheater, and evaporator, the hot flue gas from the waste heat boiler enters the economizer area in the tail flue. During normal operation of the dry quenching waste heat boiler, the wall temperature of the superheater and reheater is approximately 200°C higher than the water-cooled wall temperature. Under operating conditions, there is a significant expansion difference between the superheater and reheater at the water-cooled wall tube penetration points. Because dry quenching boilers have strict control requirements for CO and H2 content, they also have stringent requirements for sealing. Ordinary superheater seals, to accommodate the thermal expansion difference between the superheater and water-cooled wall, typically use a welded structure of expansion joints and sealing boxes at the water-cooled wall tube penetration points. However, when multiple rows of tube bundles are present, the small spacing between the tube bundles makes it impossible to weld the comb-shaped plate to the intermediate layer of tube bundles during installation, resulting in numerous air leaks in the seal.

[0004] Based on this, the present invention proposes a novel sealing solution that can reduce the conflict between the thermal expansion and sealing performance of the boiler sealing box. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall in a dry quenching coke boiler, which can ensure sealing performance without affecting the deformation and expansion of the tube bundle. This is achieved through the following technical solution:

[0006] A sealing box for multi-row tube bundles at the tube penetration point of a dry quenching coke boiler water-cooled wall includes a sealing cover and a fixing box, wherein:

[0007] The fixing box is fixedly installed at the pipe penetration point of the water-cooled wall and surrounds the outside of the tube bundle;

[0008] The fixing box is provided with a comb plate, and the comb plate is provided with multiple comb teeth located between the tube bundles; the fixing box is also provided with a sealing folding plate;

[0009] The sealing cover is installed outside the tube bundle. One end of the sealing cover is connected to the fixing box, and the other end is welded and fixed to the header. The sealing cover is also filled with thermal insulation cotton.

[0010] Optionally or preferably, the fixing box includes a pre-welded water-cooled wall component, a clamping plate, and a connecting plate; one end of the pre-welded water-cooled wall component is welded and fixed to the water-cooled wall, and the other end is fixedly connected to the sealing cover through the clamping plate and the connecting plate.

[0011] Optionally or preferably, the fixing box is a square box structure, and the sealing folding plate inside the fixing box can cooperate with the clamping plate to allow the water-cooled wall to expand along the depth direction of the furnace while maintaining a seal.

[0012] Optionally or preferably, the insulation cotton is aluminum silicate fiber cotton, which can effectively prevent high-temperature flue gas from damaging the header and sealing cover.

[0013] Optionally or preferably, the cover of the sealing cover adopts a welded folded plate splicing structure, which can absorb the expansion difference between the boiler water-cooled wall and the sealing cover along the width direction of the furnace.

[0014] Optionally or preferably, the comb teeth of the comb plate are in close fit with the tube bundle, and the comb teeth and the tube bundle are in non-fixed metal-to-metal hard contact.

[0015] Based on the above technical solution, the present invention provides a multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall in a dry quenching coke boiler. This box provides a seal for the serpentine tubes with multiple rows of tube bundles in the superheater, reheater, etc., of a dry quenching coke waste heat boiler at the tube penetration point in the water-cooled wall or flue liner. Its beneficial effects include:

[0016] (1) The combination structure of the sealing box and the sealing folding plate in this invention can effectively absorb the expansion difference between the water-cooled wall and the tube bundle along the depth direction of the furnace.

[0017] (2) The comb plate in this invention can increase the resistance to the entry of flue gas and reduce the amount of flue gas entering the sealing cover;

[0018] (3) The present invention includes a two-stage sealing structure of comb plate sealing and sealing cover sealing, which not only solves the problem of the difference in expansion between the furnace width direction and depth direction between the superheater and the water-cooled wall during boiler operation, but also avoids the problem of difficulty in welding the multi-row tube bundle of the superheater to the comb plate.

[0019] (4) The sealing cover of the present invention is filled with heat insulation cotton, which can prevent high temperature flue gas from damaging the header and sealing cover, and does not affect the bending deformation of the tube bundle to adapt to expansion. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is the front view (sectional view) of the present invention;

[0022] Figure 2 This is a sectional view along line AA of the present invention;

[0023] Figure 3 This is a BB-direction sectional view of the present invention;

[0024] Figure 4 This is a schematic diagram of the comb teeth structure on the comb plate in this invention;

[0025] Figure 5 This is a schematic diagram of the folded structure of the sealing cover in this invention;

[0026] Figure 6 This is a partially enlarged schematic diagram of structure C in this invention;

[0027] In the diagram: 1-Insulation cotton, 2-Sealing cover, 3-Sealing folding plate, 4-Clamping plate, 5-Comb plate, 6-Connecting plate, 7-Water-cooled wall pre-welded parts, 501-Comb teeth. Detailed Implementation

[0028] It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Example 1:

[0031] This embodiment provides a multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall in a dry-quenching coke boiler, such as... Figures 1-3 As shown, it includes a fixing box and a sealing cover 2, wherein:

[0032] The fixing box is fixedly installed at the pipe penetration point of the water-cooled wall and surrounds the outside of the tube bundle;

[0033] like Figure 4 As shown, a comb plate 5 is provided inside the fixing box, and the comb plate 5 has multiple comb teeth located between the tube bundles; a sealing folding plate 3 is also provided inside the fixing box;

[0034] The sealing cover 2 is installed outside the tube bundle. One end of the sealing cover 2 is connected to the fixing box, and the other end is welded and fixed to the header. The sealing cover 2 is also filled with heat insulation cotton 1, which can prevent high temperature flue gas from damaging the header and sealing cover, and does not affect the bending deformation and expansion of the serpentine tube.

[0035] In this embodiment, the fixing box includes a water-cooled wall pre-welded component 7, a clamping plate 4, and a connecting plate 6; one end of the water-cooled wall pre-welded component 7 is welded and fixed to the water-cooled wall, and the other end is fixedly connected to the sealing cover 2 through the clamping plate 4 and the connecting plate 6.

[0036] In this embodiment, as Figure 2 As shown, the fixing box is a quadrilateral structure that fits together, which can absorb the expansion difference between the water-cooled wall and the superheater serpentine tube along the depth direction of the furnace; the sealing baffle 3 inside the fixing box can cooperate with the clamping plate 4, so that the water-cooled wall can also expand along the depth direction of the furnace while maintaining a seal.

[0037] In this embodiment, the insulation cotton 1 is aluminum silicate fiber cotton, which has the advantages of high temperature resistance, good thermal stability, low thermal conductivity, small heat capacity, good resistance to mechanical vibration, small thermal expansion, and good thermal insulation performance. It can effectively prevent high temperature flue gas from damaging the header and sealing cover.

[0038] In this embodiment, as Figure 5 and Figure 6 As shown, the cover of the sealing cover 2 adopts a welded folded plate splicing structure, which can absorb the expansion difference between the boiler water-cooled wall and the sealing cover along the width of the furnace.

[0039] In this embodiment, the comb teeth of the comb plate 5 are tightly fitted with the tube bundle, and the comb teeth and the tube bundle are in a non-fixed metal-metal hard contact. The comb plate 5 with this structure can increase the flue gas resistance, reduce the amount of flue gas entering the sealing cover, and avoid welding the tube bundle and the sealing plate on the construction site, thus ensuring good construction quality of the heated surface and reducing on-site heat treatment work.

[0040] The working principle of this embodiment is as follows:

[0041] like Figure 1 As shown, a multi-row tube bundle sealing box is installed at the tube penetration point of the superheater. The sealing baffle 3 is fixed to the water-cooled wall pre-welded component 7. The sealing baffle 3 and the water-cooled wall pre-welded component 7 are fixed to the secondary sealing cover 2 of the outlet tube by the clamping plate 4 and the connecting plate 6. The comb plate 5 blocks the gap between the tube rows, forming a primary seal that is tightly welded except for the tube rows. The water-cooled wall pre-welded component 7 is welded to the sealing cover 2 by the clamping plate 4 and the connecting plate 6. One end of the sealing cover 2 is fixed to the header, forming a tightly welded secondary seal. At the same time, when installing the outlet tube baffle, aluminum silicate fiber cotton 1 is filled inside the sealing cover to prevent high-temperature flue gas from damaging the header and the sealing cover.

[0042] The structures, functions, and connection forms disclosed herein can be implemented in other ways. For example, the embodiments described above are merely illustrative and other installation methods are possible, such as multiple components being combined or integrated into another component; furthermore, the functional components in the various embodiments herein can be integrated into one functional component, or each functional component can exist physically separately, or two or more functional components can be integrated into one functional component.

[0043] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention should be within the protection scope of the appended claims.

Claims

1. A sealing box for multiple rows of tube bundles passing through the tubes of a dry-quenching coke boiler water-cooled wall, characterized in that: Includes a retaining box and a sealing cover, wherein: The fixing box is fixedly installed at the pipe penetration point of the water-cooled wall and surrounds the outside of the tube bundle; The fixing box is provided with a comb plate (5), and the comb plate (5) is provided with a plurality of comb teeth located between the tube bundles; the fixing box is also provided with a sealing folding plate (3). The sealing cover (2) is installed outside the tube bundle. One end of the sealing cover (2) is connected to the fixing box, and the other end is welded and fixed to the header. The sealing cover (2) is also filled with thermal insulation cotton (1). The fixing box is a square box structure. The sealing folding plate (3) inside the fixing box can cooperate with the card plate (4) so ​​that the water-cooled wall can expand along the depth direction of the furnace while maintaining the seal. The cover of the sealing cover (2) adopts a welded folded plate splicing structure, which can absorb the expansion difference between the boiler water-cooled wall and the sealing cover along the width of the furnace.

2. The multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall of a dry quenching coke boiler according to claim 1, characterized in that: The fixing box includes a water-cooled wall pre-welded component (7), a clamping plate (4), and a connecting plate (6); one end of the water-cooled wall pre-welded component (7) is welded and fixed to the water-cooled wall, and the other end is fixedly connected to the sealing cover (2) through the clamping plate (4) and the connecting plate (6).

3. A multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall of a dry quenching coke boiler according to claim 1, characterized in that: The insulation cotton (1) is aluminum silicate fiber cotton, which can effectively prevent high-temperature flue gas from damaging the header and sealing cover.

4. A multi-row tube bundle sealing box at the tube penetration point of the water-cooled wall of a dry quenching coke boiler according to claim 1, characterized in that: The comb teeth of the comb plate (5) are tightly fitted with the tube bundle, and the comb teeth and the tube bundle are in non-fixed metal-metal hard contact.

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