Flange leak-proof sealing structure for pulverized coal pipeline of gasifier burner

Abstract

This disclosure discloses a leak-proof sealing structure for a gasifier burner pulverized coal pipeline flange, comprising: a female end of the burner pulverized coal pipeline flange, made of a high-temperature resistant alloy material, with an annular sealing groove machined on the sealing surface for installation and positioning of a metal sealing assembly; a male end of the burner pulverized coal pipeline flange, made of the same high-temperature resistant alloy material as the female end of the burner pulverized coal pipeline flange, with a conical sealing boss machined on the sealing end to match the annular sealing groove, the taper of the conical sealing boss being consistent with the guide slope at the bottom of the annular sealing groove; and a metal sealing assembly, which is generally T-shaped, including a base section that mates with the annular sealing groove and a sealing line section that fits against the conical sealing boss, the top of the sealing line section being machined into a sharp edge of 0.8-1.5mm to form a tight line contact with the conical sealing boss; the base section of the metal sealing assembly is embedded in the annular sealing groove of the female end of the burner pulverized coal pipeline flange, and the conical sealing boss of the male end of the burner pulverized coal pipeline flange is aligned with the sealing line section of the metal sealing assembly.

Description

Technical Field

[0001] This disclosure generally relates to the field of gasifier technology. More specifically, this disclosure relates to a leak-proof sealing structure for a pulverized coal pipeline flange for a gasifier burner. Background Technology

[0002] The pulverized coal pipeline flange of the gasifier burner is a key component connecting the burner and the pulverized coal pipeline. It needs to operate under harsh conditions for extended periods, including high temperatures of 1400-1700℃, high pressures of 4.0MPa, and frequent thermal cycling, placing extremely stringent requirements on its sealing performance. Currently, most existing gasifier burner pulverized coal pipeline flanges in the industry use O-ring seals. These O-rings are mostly made of rubber or flexible graphite, which have significant technical drawbacks, primarily their susceptibility to leakage and short service life. Currently, there is a lack of dedicated sealing optimization solutions for gasifier burner pulverized coal pipeline flanges operating under high temperature, high pressure, and thermal cycling conditions. A technical solution is urgently needed to address the core problems of traditional O-ring seals.

[0003] In view of this, there is an urgent need to provide a leak-proof sealing structure for the pulverized coal pipeline flange of the gasifier burner, so as to solve the problems of easy leakage and short service life of traditional O-ring seals. Summary of the Invention

[0004] In order to at least address one or more of the technical problems mentioned above, this disclosure proposes a leak-proof sealing structure for a gasifier burner pulverized coal pipeline flange.

[0005] This disclosure provides a leak-proof sealing structure for a gasifier burner pulverized coal pipeline flange, comprising: a female end of the burner pulverized coal pipeline flange, which is made of a high-temperature resistant alloy material and has an annular sealing groove machined on its sealing surface for installation and positioning of a metal sealing assembly; a male end of the burner pulverized coal pipeline flange, which is made of the same high-temperature resistant alloy material as the female end of the burner pulverized coal pipeline flange, and has a conical sealing boss machined on its sealing end to match the annular sealing groove, the taper of the conical sealing boss being consistent with the guide slope at the bottom of the annular sealing groove; and a metal sealing assembly, which is made of Hastelloy C276 material and is integrally shaped as… The T-shaped structure includes a base section that mates with the annular sealing groove and a sealing line section that fits against the conical sealing boss. The top of the sealing line section is machined into a sharp edge of 0.8-1.5mm to form a tight line contact with the conical sealing boss. The base section of the metal sealing assembly is embedded in the annular sealing groove of the female end of the burner pulverized coal pipeline flange. The conical sealing boss of the male end of the burner pulverized coal pipeline flange is aligned with the sealing line section of the metal sealing assembly. The flange bolts are pre-tightened in a diagonal sequence using a torque wrench to ensure uniform contact pressure between the sealing line and the conical sealing boss, forming a stable sealing surface.

[0006] In some embodiments, the annular sealing groove at the female end of the burner pulverized coal pipeline flange has a groove depth of 8-12mm, a groove width of 5-8mm, and a guide slope angle of 15°-20°.

[0007] In some embodiments, the guide ramp at the bottom of the annular sealing groove is configured to guide the base section of the metal sealing assembly into the sealing groove, while ensuring the coaxiality of the metal sealing assembly and the conical sealing boss.

[0008] In some embodiments, a metal sealing line with a width of 1-2 mm is formed at the top of the tapered sealing boss of the male end of the burner pulverized coal pipeline flange, and the metal sealing line is tightly fitted with the sharp edge of the sealing line segment of the metal sealing assembly.

[0009] In some embodiments, the high-temperature resistant alloy material used for the female end of the burner pulverized coal pipeline flange and the male end of the burner pulverized coal pipeline flange is 310S alloy or S31603 alloy.

[0010] In some embodiments, the preload torque of the flange bolts is set according to the flange specification. When the flange specification is DN65, the preload torque is 343 N·m.

[0011] In some embodiments, the dimensions of the base section of the metal sealing assembly are matched with the groove depth and groove width of the annular sealing groove.

[0012] In some embodiments, the sharp edge at the top of the sealing segment of the metal sealing assembly has a thickness of 0.8-1.5 mm, and the surface of the sharp edge is polished.

[0013] The leak-proof sealing structure for pulverized coal pipeline flanges of gasifier burners provided above, in this embodiment, by setting the flange female and male ends made of high-temperature alloy material, and matching them with the "T" type metal sealing assembly made of Hastelloy C276 material, and by using diagonally pre-tightened bolts for assembly, can solve the problems of easy leakage and short service life of traditional O-ring seals. Attached Figure Description

[0014] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0015] Figure 1 An exemplary side view of the female end of a gasifier burner pulverized coal pipeline flange with a leak-proof sealing structure for some embodiments of this disclosure is shown. Figure 2 An exemplary top view of the female end of a gasifier burner pulverized coal pipeline flange with a leak-proof sealing structure for some embodiments of this disclosure is shown. Figure 3 An exemplary perspective view of the female end of a gasifier burner pulverized coal pipeline flange with a leak-proof sealing structure for some embodiments of this disclosure is shown. Detailed Implementation

[0016] The technical solutions in the embodiments of this disclosure 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 this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0017] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0018] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0019] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0020] This disclosure provides a leak-proof sealing structure for a pulverized coal pipeline flange of a gasifier burner. It features a flange female and male end made of high-temperature alloy, paired with a "T"-shaped metal sealing assembly made of Hastelloy C276, and assembled using diagonally pre-tightened bolts. This structure can be applied to high-temperature conditions of 1400-1700℃, high-pressure conditions of 4.0MPa, and thermal cycling. It solves the problems of easy leakage and short lifespan of traditional O-ring seals, improving sealing reliability, extending service life, reducing maintenance frequency and downtime, and lowering safety risks.

[0021] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0022] See Figures 1 to 3 , Figure 1 An exemplary side view of the female end of a gasifier burner pulverized coal pipeline flange with a leak-proof sealing structure for some embodiments of this disclosure is shown. Figure 2 An exemplary top view of the female end of a gasifier burner pulverized coal pipeline flange with a leak-proof sealing structure for some embodiments of this disclosure is shown. Figure 3 An exemplary perspective view of the female end of a gasifier burner pulverized coal pipeline flange with a leak-proof sealing structure for some embodiments of this disclosure is shown.

[0023] A leak-proof sealing structure for a gasifier burner pulverized coal pipeline flange includes a female end of the burner pulverized coal pipeline flange, a male end of the burner pulverized coal pipeline flange, and a metal sealing assembly. The female end of the burner pulverized coal pipeline flange is made of a high-temperature resistant alloy, and its sealing surface 12 is machined with an annular sealing groove 11 for positioning the metal sealing assembly. The male end of the burner pulverized coal pipeline flange is made of the same high-temperature resistant alloy as the female end, and its sealing end is machined with a conical sealing boss that matches the annular sealing groove 11. The taper of the conical sealing boss matches the guide slope 13 at the bottom of the annular sealing groove 11. The metal sealing assembly is made of Hastelloy C276 and has an overall "T"-shaped structure, including a base section that mates with the annular sealing groove 11 and a sealing line section that fits against the conical sealing boss. The top of the sealing line section is machined with a sharp edge of 0.8-1.5mm to form a tight line contact with the conical sealing boss. The base section of the metal sealing assembly is embedded in the annular sealing groove 11 of the female end of the burner pulverized coal pipeline flange. The conical sealing boss of the male end of the burner pulverized coal pipeline flange is aligned with the sealing line section of the metal sealing assembly. The flange bolts are pre-tightened in a diagonal sequence using a torque wrench to ensure that the sealing line and the conical sealing boss are evenly pressed together, forming a stable sealing surface 12.

[0024] The high-temperature resistant alloy material can be used in gasifiers operating at high temperatures of 1400-1700℃ and high pressures of 4.0MPa, preventing flange deformation from affecting the seal. The annular sealing groove 11 and the base section of the metal sealing assembly have a clearance fit, enabling rapid positioning and stable installation of the sealing assembly. The guide slope 13 at the bottom of the annular sealing groove 11 has the same taper as the conical sealing boss, ensuring precise alignment during assembly. In the "T"-shaped structure of the metal sealing assembly, the base section is used for limiting and fixing, while the sharp edge design of the sealing line reduces the contact area and increases the contact pressure, achieving metal-to-metal line contact sealing. Compared to traditional technology, this avoids the problem of O-ring leakage due to high-temperature aging. The corresponding multiple fastening bolts adopt a diagonal pre-tightening bolt connection method to avoid uneven flange stress causing the sealing surface 12 to shift, ensuring uniform sealing pressure, and thus achieving stable sealing under high-temperature, high-pressure, and thermal cycling conditions, improving sealing reliability.

[0025] In some embodiments, the annular sealing groove 11 of the female end of the burner pulverized coal pipeline flange has a groove depth of 8-12mm, a groove width of 5-8mm, and a guide slope 13 angle of 15°-20°. The dimensions of the annular sealing groove 11 and the angle of the guide slope 13 are configured as follows: groove depth 8-12mm, groove width 5-8mm, and guide slope 13 angle 15°-20°. This ensures that the metal sealing component base section is fully embedded without loosening, while also reserving a reasonable assembly gap for easy installation. It guides the metal sealing component base section to accurately embed into the sealing groove, avoiding sealing gaps caused by assembly deviations.

[0026] In some embodiments, the guide slope 13 at the bottom of the annular sealing groove 11 guides the base segment of the metal sealing assembly to accurately embed into the sealing groove, while ensuring the coaxiality of the metal sealing assembly and the conical sealing boss. The guide slope 13 fits against the bottom surface of the base segment of the metal sealing assembly, serving as a guide and positioning element to prevent the metal sealing assembly from shifting during assembly. Simultaneously, because the taper of the guide slope 13 matches the taper of the conical sealing boss, after assembly, it ensures that the metal sealing assembly and the conical sealing boss are coaxial, allowing the sharp edge of the sealing line segment to fully fit against the metal sealing line at the top of the boss, avoiding potential leakage due to partial loose fit and ensuring the sealing effect of the sealing structure.

[0027] In some embodiments, a 1-2mm wide metal sealing line is formed at the top of the tapered sealing boss on the male end of the burner pulverized coal pipeline flange. This metal sealing line is tightly fitted with the sharp edge of the sealing segment of the metal sealing assembly. The 1-2mm wide metal sealing line at the top of the tapered sealing boss is the core contact area with the sharp edge of the metal sealing assembly. This ensures stable contact while further reducing the contact area and increasing the contact pressure, thus enhancing the line contact sealing effect. The tight fit between the metal sealing line and the sharp edge of the sealing segment forms a double metal line contact sealing structure, preventing gaps caused by thermal expansion and contraction and improving the reliability of the sealing structure.

[0028] In some embodiments, the high-temperature resistant alloy material used for the female and male ends of the burner pulverized coal pipeline flanges is either 310S alloy or S31603 alloy. Both 310S and S31603 alloys are commonly used high-temperature resistant and corrosion-resistant alloy materials, applied in the high-temperature and high-pressure conditions of gasifiers. Their high-temperature resistance can meet the operating requirements of 1400-1700℃, and their corrosion resistance can resist the wear and erosion of pulverized coal media. As the material for the female and male ends of the flanges, it ensures that the flanges themselves do not age, deform, or become damaged under harsh operating conditions, avoiding the impact of flange structural failure on the sealing effect.

[0029] In some embodiments, the preload torque of the flange bolts is set according to the flange specifications. When the flange specification is DN65, the preload torque is 343 N·m. The flange bolt preload torque is matched with the flange specifications to ensure uniform contact pressure on the sealing surface 12. The corresponding preload torque can prevent excessive torque from causing flange deformation and insufficient torque from causing loose contact. When the flange specification is DN65, the preload torque of 343 N·m has been verified under operating conditions to ensure uniform contact pressure between the sealing line and the conical sealing boss, forming a stable sealing surface 12.

[0030] In some embodiments, the dimensions of the base section of the metal sealing assembly are matched with the depth and width of the annular sealing groove 11. The matching of the base section dimensions with the groove depth and width ensures that the height and width of the base section are consistent with the groove depth and width, allowing the base section to be fully embedded within the annular sealing groove 11. This achieves stable installation of the metal sealing assembly and prevents loosening or displacement of the sealing assembly due to vibration, thermal cycling, or other operating conditions during operation. Simultaneously, the tight fit reduces the gap between the sealing assembly and the sealing groove, preventing media from seeping into the gap and causing seal failure, further ensuring the stability of the sealing structure.

[0031] In some embodiments, the sharp edge at the tip of the sealing segment of the metal sealing assembly has a thickness of 0.8-1.5 mm, and the surface of the sharp edge is polished. The 0.8-1.5 mm thick sharp edge design at the tip of the sealing segment maximizes the reduction of contact area and increases the contact pressure, thereby enhancing the sealing effect, while ensuring structural strength and preventing sharp edge breakage. The polishing treatment of the sharp edge surface reduces frictional loss when it contacts the tapered sealing boss metal sealing line, reducing wear during assembly and operation, extending the service life of the metal sealing assembly, and ensuring a smooth and tight contact surface, preventing leakage due to gaps caused by surface roughness.

[0032] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A leakage-proof sealing structure for a pulverized coal pipeline flange of a gasifier burner, characterized by, include: The female end of the burner pulverized coal pipeline flange is made of high temperature resistant alloy material, and the sealing surface (12) is machined with an annular sealing groove (11). The male end of the burner pulverized coal pipeline flange has the same high-temperature resistant alloy material as the female end of the burner pulverized coal pipeline flange. The sealing end is machined with a conical sealing boss that matches the annular sealing groove (11). The taper of the conical sealing boss is consistent with the guide slope at the bottom of the annular sealing groove (11). A metal sealing assembly, made of Hastelloy C276, has an overall "T"-shaped structure, including a base section that mates with the annular sealing groove (11) and a sealing line section that fits against the conical sealing boss. The top of the sealing line section is machined into a sharp edge of 0.8-1.5 mm to form a tight line contact with the conical sealing boss; and The base section of the metal sealing assembly is embedded in the annular sealing groove (11) of the female end of the burner pulverized coal pipeline flange. The conical sealing boss of the male end of the burner pulverized coal pipeline flange is aligned with the sealing line section of the metal sealing assembly. The flange bolts are pre-tightened in a diagonal sequence using a torque wrench to ensure that the sealing line and the conical sealing boss are evenly pressed together, forming a stable sealing surface (12).

2. The gasification furnace burner coal powder pipeline flange leak-proof sealing structure according to claim 1, characterized in that, The annular sealing groove (11) at the female end of the burner pulverized coal pipeline flange has a depth of 8-12mm and a width of 5-8mm, and the angle of the guide slope is 15°-20°.

3. The gasification furnace burner coal powder pipeline flange leak-proof sealing structure according to claim 2, characterized in that, The guide slope (13) at the bottom of the annular sealing groove (11) is configured to guide the base section of the metal sealing assembly into the sealing groove, while ensuring the coaxiality of the metal sealing assembly and the conical sealing boss.

4. The gasification furnace burner coal powder pipeline flange leak-proof sealing structure according to claim 3, characterized in that, The top of the tapered sealing boss at the male end of the burner pulverized coal pipeline flange forms a metal sealing line with a width of 1-2mm, and the metal sealing line is tightly fitted with the sharp edge of the sealing line segment of the metal sealing assembly.

5. The leak-proof sealing structure for the pulverized coal pipeline flange of the gasifier burner according to any one of claims 1 to 4, characterized in that, The high-temperature resistant alloy material used for the female end of the burner pulverized coal pipeline flange and the male end of the burner pulverized coal pipeline flange is 310S alloy or S31603 alloy.

6. The leak-proof sealing structure for the pulverized coal pipeline flange of the gasifier burner according to any one of claims 1 to 4, characterized in that, The preload torque of the flange bolts is set according to the flange specifications. When the flange specification is DN65, the preload torque is 343 N·m.

7. The leak-proof sealing structure for the pulverized coal pipeline flange of the gasifier burner according to any one of claims 1 to 4, characterized in that, The dimensions of the base section of the metal sealing assembly are matched with the groove depth and groove width of the annular sealing groove (11).

8. The leak-proof sealing structure for the pulverized coal pipeline flange of the gasifier burner according to any one of claims 1 to 4, characterized in that, The sharp edge at the top of the sealing segment of the metal sealing assembly has a thickness of 0.8-1.5mm, and the surface of the sharp edge is polished.

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