Filter holder and gasket assembly for candle tube filters

• US 6,123,746 A
• Filed: 03/04/1999
• Issued: 09/26/2000
• Est. Priority Date: 03/04/1999
• Status: Expired due to Term

• Current Assignee: Siemens Energy Incorporated (Siemens AG)
• Original Assignee: Siemens Westinghouse Power Corporation
• Inventors: Alvin, Marry Anne, Atkian, Thomas K.
• Primary Examiner(s): Simmons, David A.
• Assistant Examiner(s): PHAM, MINH CHAU THI
• Application Number:
  US09/263,436
• Time in Patent Office: 572 Days
• Field of Search: 55/341.1, 55/378, 55/484, 55/502, 55/508, 55/523, 277/528, 277/529, 277/633, 277/644, 277/610, 277/910
• US Class Current: 55/502
• CPC Class Codes: B01D 2265/05 Special adapters for the connection of filters or parts of filters
• CPC Class Codes: B01D 2271/02 Gaskets, sealings
• CPC Class Codes: B01D 2273/20 High temperature filtration
• CPC Class Codes: B01D 46/0009 Tray-like arrangements of filters in a vessel
• CPC Class Codes: B01D 46/2407 Filter candles
• CPC Class Codes: B01D 46/58 connected in parallel

Abstract

A candle filter holder and gasket assembly for holding a candle filter element within a hot gas cleanup system pressure vessel contians a filter housing (62), a candle filter attached to the filter housing and at least one associated gasket (74) and/or (76) where at least the one associated gasket has a construction that is selected from a single end rolled single spiral (75) or a two end rolled double spiral (71), both constructions having no separate center element and where the at least one gasket (74) and/or (76) functions to provide a seal between filtered gas and dirty or contaminated unfiltered gas within the gas cleanup system.

Claims

1. A candle filter holder and gasket assembly for holding a candle filter element within a hot gas cleanup system pressure vessel, the filter element including a body having two opposing ends, one defining a flange open end and the other defining a closed end;

the filter element body having a smaller inner diameter surface and a larger inner diameter surface, said candle holder and gasket assembly comprising;

a. a filter housing, said filter housing having a peripheral sidewall, said sidewall defining an interior chamber;

b. at least one compliant gasket separate and apart from the filter housing, said compliant gasket positioned next to the filter element and effective to provide a seal between filtered gas and unfiltered gas and to cushion the filter element; and

c. means for coupling the filter element, filter housing, and gaskets within the pressure vessel;

where the at least one compliant gasket has a circular sleeve construction that consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a configuration selected from (1) a single end rolled single spiral or (2) a two end rolled double spiral, both constructions with no separate center element, said gaskets consisting of ceramic sheet or sleeving.

2. The assembly of claim 1, where the assembly contains an individual top complaint gasket and an individual bottom compliant gasket and where at least one of the gaskets has a construction that consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a configuration selected from (1) a single end rolled single spiral or (2) a two end rolled double spiral, both constructions with no separate center element.

3. The assembly of claim 2, where the top gasket has a construction that consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a configuration selected from (1) a single end rolled single spiral or (2) a two end rolled double spiral, both constructions with no separate center.

4. The assembly of claim 2, where both the top gasket and bottom gasket have a construction that consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a configuration selected from (1) a single end rolled single spiral or (2) a two end rolled double spiral, both constructions with no separate center element.

5. The assembly of claim 1, where the at least one complaint gasket consists of a single end rolled single spiral configuration, with no separate center element.

6. The assembly of claim 1, where the at least one complaint gasket consists of a two end rolled single spiral configuration, with no separate center element.

7. A filter holder and gasket assembly for holding a thick walled candle filter element within a hot gas cleanup system pressure vessel, the filter element including a body having two opposing ends, one defining a flange open end and the other defining a closed end;

the flange open end having a top surface, an outer flange diameter surface and a flange inner diameter surface;

the filter element body having a smaller inner diameter surface and a larger inner diameter surface, said filter element body inside diameter surface being equal to or less than the flange inner diameter surface;

said filter holder assembly comprising;

a. a filter housing, said filter housing having a peripheral sidewall, said sidewall defining an interior chamber;

b. a generally annular spacer ring within said interior chamber;

c. at least one individual gasket sock separate and apart from the filter housing, said gasket sock formed to be positioned completely around the filter flange outer diameter surface and at least a portion of the filter body to provide a seal between the filter flange outer diameter surface, a portion of the filter body, and said filter housing;

d. at least one individual top compliant gasket separate and apart from the filter housing, said top compliant gasket formed to be positioned on the filter flange end top surface for providing a seal between said spacer ring and the filter flange top surface;

e. at least one individual bottom compliant gasket separate and apart from the filter housing, said bottom gasket formed to be positioned between said gasket sock and said filter housing sidewall to provide a seal between a portion of the filter body and said filter housing sidewall; and

f. a means for coupling the filter element, filter housing, and gaskets within the pressure vessel;

where both top and bottom gaskets have a circular sleeve construction which consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a configuration selected from (1) a single end rolled single spiral or (2) a two end rolled double spiral, both constructions with no separate center element said gaskets consisting of ceramic sheet or sleeving.

8. The assembly of claim 7 where said spacer ring is welded within said housing interior chamber.

9. The assembly of claim 7, where both top and bottom gaskets have a construction which consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a single end rolled single spiral, with no separate center element.

10. The assembly of claim 7, where both top and bottom gaskets have a construction which consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a two end rolled double spiral, with no separate center element.

11. A filter holder and gasket assembly for holding a thin-walled candle filter element within a hot gas cleanup system pressure vessel, the filter element including a body having two opposing ends, one defining a flange open end and the other defining a closed end;

the flange open end having a relatively thin wall outer diameter surface and flange inner diameter surface, said flange smaller inner diameter surface having a smaller diameter than said outer flange diameter;

the filter element body having a smaller inner diameter surface and a larger outer diameter surface, said filter holder assembly comprising;

a. a filter housing, said filter housing having a peripheral sidewall, said sidewall further defining an interior chamber;

b. a generally annular spacer ring within said filter housing interior chamber, said spacer ring further including a top surface and a bottom surface;

c. at least one individual gasket sock separate and apart from the filter housing, said gasket sock formed to be positioned completely around the thin wall filter flange outer diameter surface and at least a portion of the filter body to provide a seal between the filter flange outer diameter surface, a portion of the filter body, and said filter housing;

d. at least one individual top compliant gasket separate and apart from the filter housing, said gasket formed to be positioned adjacent to the inner surface of the thin wall filter element flange to provide a seal between the thin walled candle filter flange inner diameter surface and the spacer ring;

e. at least one individual bottom compliant gasket separate and apart from the filter housing, said bottom gasket formed to be positioned between said gasket sock and said filter housing sidewall to provide a seal between the filter body and said filter housing sidewall; and

f. a means for coupling the filter element, filter housing, and gaskets within the pressure vessel;

where both top and bottom gaskets have a circular sleeve construction which consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a configuration selected from (1) a single end rolled single spiral or (2) a two end rolled double spiral, both constructions with no separate center element, said gaskets consisting of ceramic sheet or sleeving.

12. The assembly of claim 11 wherein said spacer ring is welded within said filter housing interior chamber.

13. The assembly of claim 11, where both top and bottom gaskets have a construction which consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a single end rolled single spiral, with no separate center element.

14. The assembly of claim 11, where both top and bottom gaskets have a construction which consists of a single element made of a braided or woven sheet or sleeving rolled within itself to form a two end rolled double spiral, with no separate center element.