Safe and automatic method for preparation of coke for...

Distillation: processes – thermolytic – With cleaning of apparatus

Reexamination Certificate

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Details

C202S241000, C202S242000, C202S270000

Reexamination Certificate

active

07037408

ABSTRACT:
A safe, efficient and repetitively operable coke vessel decoking system is disclosed. In a preferred embodiment the closed system comprises a coker vessel pressure-tightly sealed to a top head system, which includes a closure housing with a laterally moveable horizontal closure member therein and a cutting head enclosure, which further comprises a drill stem guide, an access door, and a cutting assembly mounted therein. A novel feature of the invention is a steam purge/blocking system whereby steam pressure is maintained in the closure housing during the coking cycle to maintain seal integrity. Personnel safety during decoking operations is greatly enhanced by eliminating dangerous manual tasks associated with the prior art such as unbolting and removing top head devices. The system can be remotely and repetitively operated through numerous coking/decoking cycles without removal of any system element.

REFERENCES:
patent: 4995413 (1991-02-01), Torres et al.
patent: 5022799 (1991-06-01), Torres et al.
patent: 5092863 (1992-03-01), Schanzlin
patent: 5139619 (1992-08-01), Schoonover
patent: 5259930 (1993-11-01), Barker et al.
patent: 5417811 (1995-05-01), Malsbury
patent: 5785322 (1998-07-01), Suggs et al.
patent: 6050277 (2000-04-01), Purton et al.
patent: 6228225 (2001-05-01), Meher-Homji
patent: WO 02/072729 (2002-09-01), None

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