Sealing arrangement with a segmented seal and pressure relief
View Patent ↗A sealing apparatus adapted for use in a pressure vessel such as a synthesis gas cooler. The sealing apparatus is of a segmented plate construction formed around an outer wall section of a conduit means of the pressure vessel that defines at least part of a passage for receiving effluent from a gasification process. Pressure responsive mechanisms are provided on the plate segments to maintain the pressure difference across the sealing apparatus within the acceptable operating limits as well as to permit instantaneous pressure release to prevent damage to the pressure part assembly or cage. The seal is also maintained continuously through the differential growth movement between the conduit means and the pressure vessel during heat up and cool down cycles.
1. A sealing apparatus for accommodating pressure differential between opposite sides of a conduit member contained within a pressure vessel, the sealing apparatus comprising:
seal ring segments located on and extending around a lower outer surface portion of the conduit member in a plane perpendicular to a central conduit axis;
a plurality of spaced retaining rods located on and extending outwardly from a peripheral surface of the seal ring segments;
a flange member having a slot formed on one end thereof for receiving the seal ring segments and at least one fastening bore opening into the slot for receiving one of the retaining rods therein, each seal ring segment being movably mounted on at least one ring retaining rod, the neighboring seal ring segments being joined to each other to form first fluid tight connections, the seal ring segments being arranged around and overlapping at least part of the conduit member along a lengthwise direction as an elongated body;
a first fastening member mounted on and adapted to retain the one end of each seal ring segment on the retaining rod; and
a first resilient member disposed between each first fastening member and the respective seal ring segment to resiliently load the seal ring segments against the conduit member to form second fluid tight connections;
a plurality of pressure relief openings formed in the flange member; and
a resiliently biased door located over and covering the pressure relief opening,
wherein the other end of the flange member is attached to a seal plate spaced at a distance from the conduit member to form third fluid tight connections,
wherein the first, second and third fluid tight connections form a fluid tight seal between opposite sides of the conduit member, and
wherein the resiliently biased door is adapted to close the pressure relief opening when the pressure differential is below a predetermined threshold pressure value and to open and reduce the pressure differential when the pressure differential is equal to or exceeds the predetermined threshold pressure value.
2. The sealing apparatus of claim 1 , wherein the pressure vessel is a synthesis gas cooler and the conduit member is adapted to receive an effluent produced by a gasification process.
3. The sealing apparatus of claim 1 , wherein the conduit member has a circular cross sectional shape and wherein the seal ring segments have an arcuate configuration to conform to the surface of the conduit member.
4. The sealing apparatus of claim 1 , wherein the seal ring segments have substantially the same width.
5. The sealing apparatus of claim 1 , wherein the seal ring segments have different widths.
6. The sealing apparatus of claim 1 , wherein the seal ring segments have an arcuate configuration with a rectangular configuration in cross-section.
7. The sealing apparatus of claim 1 , wherein the seal ring segments have a circular arcuate configuration.
8. The sealing apparatus of claim 1 , wherein the first fastening member is axially displaceable along the retaining rod for adjusting biasing force exerted by the first resilient member against the seal ring segments.
9. The sealing apparatus of claim 1 , further comprising a tension adjusting member disposed on the retaining rod for adjusting biasing force exerted by the first resilient member against the plate member.
10. The sealing apparatus of claim 2 , wherein at least one seal ring segment further comprises a port hole for providing a flow path for purge gas when the at least one seal ring segment is displaced outward from the flange member due to a relative movement between the conduit member and the pressure vessel.
11. The sealing apparatus of claim 1 , wherein the neighboring seal ring segments are joined via a tongue and groove interlocking structure.
12. The sealing apparatus of claim 1 , wherein the resiliently biased door is mounted on the flange member via at least one pair of spaced apart mounting assemblies each having a rod member, a second resilient member and a second fastening member,
wherein one end of the rod member is attached to and extends outwardly from the flange member,
wherein the resiliently biased door is movably mounted on each rod member of the mounting assemblies,
wherein the second fastening member is mounted on the other end of the rod member to retain the resiliently biased door and the second resilient member on the rod member, and
wherein the mounting assemblies of each pair are positioned opposite each other on opposite sides of the pressure relief opening.
13. The sealing apparatus of claim 1 , wherein the resiliently biased door overlaps an edge extending around the pressure relief opening.
14. The sealing apparatus of claim 1 , wherein the second resilient member is a coil spring.
15. The sealing apparatus of claim 12 , wherein the first resilient member is a coil spring.
16. The sealing apparatus of claim 1 , wherein the resiliently biased door is arranged in intimate surface contact with the outer surface of the flange member.
17. The sealing apparatus of claim 12 , further comprising a guide sleeve axially disposed between the second resilient member and the rod member to permit even movement of the resiliently biased door.
18. The sealing apparatus of claim 16 , wherein the resiliently biased door comprises a guide sleeve opening adapted to receive the guide sleeve.
19. The sealing apparatus of claim 11 , further comprising a sleeve member disposed on a side of the resiliently biased door facing the plate segment and abutting against at least part of an inner surface of the pressure relief opening, to permit even movement of the resiliently biased door.
20. The sealing apparatus of claim 19 , wherein the sleeve member abuts against the entire inner surface of the pressure relief opening.
21. The sealing apparatus of claim 2 , wherein a purge gas is selectively introduced into a cavity defined by the conduit member and the pressure vessel to remove any effluent that has entered the cavity.
22. The sealing apparatus of claim 1 , wherein the predetermined threshold pressure value is selected such that the pressure differential does not impair the structural integrity of the conduit member or the seal plate.
23. The sealing apparatus of claim 1 , wherein the predetermined threshold pressure value is selected such that the pressure differential does not cause the seal plate to fail and release the effluent into the cavity.
24. The sealing apparatus of claim 1 , wherein the elongated body comprises 2-10 seal ring segments, and wherein each seal ring segment is mounted on at least one retaining rod.
25. The sealing apparatus of claim 2 , wherein the seal ring segments remain in contact with the conduit member.