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US 11,697,775 B2Granted
Systems and methods for decoking a coker furnace during a delayed coking process
AssigneeBechtel Energy Technologies & Solutions, Inc.
InventorRimon Vallavanatt
Life of this patent
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Abstract
Systems and methods for efficient on-line pigging of a coker furnace without interruption of the delayed coking process, which will save time and money during the delayed coking process. This system can be retrofitted to existing coker furnaces.
Claims18
A system for on-line pigging, which comprises:
- a first tubular assembly having a first passage, a second passage and a third passage, wherein the first passage of the first tubular assembly is connected at one end to a first end of a tubular segment and each passage includes a respective valve for controlling fluid communication through each passage and the tubular segment;
- a second tubular assembly having a first passage, a second passage and a third passage, wherein the first passage of the second tubular assembly is connected at one end to a second end of the tubular segment and each passage includes a respective valve for controlling fluid communication through each passage;
- a pig for traversing the third passage of the first tubular assembly, cleaning the tubular segment during normal operation of the tubular segment and traversing the third passage of the second tubular assembly when the pig is carried by a fluid under pressure;
- and
- wherein the pig comprises a plurality of wooden discs and a plurality of ceramic cloth discs joined together, or a tightly wound rope with a diameter that is greater than an inside diameter of the third passage of the first tubular assembly, the tubular segment and the third passage of the second tubular assembly.
2 more elements
A method for on-line pigging, which comprises:
- introducing a fluid under pressure through a first passage of a first tubular assembly, a tubular segment and a first passage of a second tubular assembly, wherein the first passage of the first tubular assembly is connected at one end to a first end of the tubular segment and the first passage of the second tubular assembly is connected at one end to a second end of the tubular segment;
- introducing a pig into a third passage of the first tubular assembly that is isolated from the fluid in the first passage of the first tubular assembly by a valve in a second passage of the first tubular assembly and a valve in the third passage of the first tubular assembly;
- wherein the pig comprises a plurality of wooden discs and a plurality of ceramic cloth discs joined together, or a tightly wound rope with a diameter that is greater than an inside diameter of the third passage of the first tubular assembly, the tubular segment and the third passage of the second tubular assembly;
- redirecting the fluid through the third passage of the first tubular assembly behind the pig by closing the valve in the first passage of the first tubular assembly and opening the valves in the second passage and the third passage of the first tubular assembly;
- cleaning the tubular segment with the pig carried by the fluid under pressure during normal operation of the tubular segment;
- redirecting the fluid through a third passage of the second tubular assembly by closing a valve in the first passage of the second tubular assembly and opening a valve in a second passage and a valve in the third passage of the second tubular assembly;
- and
- extracting the pig from the third passage of the second tubular assembly after the pig passes the valve in the third passage of the second tubular assembly by closing the valves in the second passage and the third passage of the second tubular assembly and opening the valve in the first passage of the second tubular assembly.
5 more elements
Dependencies are inferred from the claim text.