SYSTEMS AND METHODS FOR ON-LINE PIGGING AND SPALLING OF COKER FURNACE OUTLETS

• US 20170174996A1
• Filed: 03/09/2017
• Published: 06/22/2017
• Est. Priority Date: 10/22/2013
• Status: Active Grant

• Current Assignee: Bechtel Energy Technologies & Solutions Incorporated
• Original Assignee: Bechtel Hydrocarbon Technology Solutions, Inc. (Bechtel Group Incorporated)
• Inventors: Doerksen, Brian, Ward, John, Heniford, Rick, Alexander, Scott, Von Brecht, Richard, Gonzalez, Jorge
• Granted Patent: US 10,457,872 B2
• Time in Patent Office: Days
• CPC Class Codes: B08B 7/0071 by heating B08B7/0035 takes precedence
• CPC Class Codes: B08B 9/032 by the mechanical action of a moving fluid, e.g. by flushing B08B9/04 takes precedence ; by fluid jets mounted on cleaning devices B08B9/0433
• CPC Class Codes: B08B 9/0325 Control mechanisms therefor
• CPC Class Codes: B08B 9/0328 by purging the pipe with a gas or a mixture of gas and liquid
• CPC Class Codes: B08B 9/055 the cleaning devices conforming to, or being conformable to, substantially the same cross-section of the pipes, e.g. pigs or moles pigs or moles per se F16L55/26; their launching and detection F16L55/46; separating pigs in pipelines F17D3/00
• CPC Class Codes: B08B 9/0551 Control mechanisms therefor
• CPC Class Codes: C10B 33/006 Decoking tools, e.g. hydraulic coke removing tools with boring or cutting nozzles
• CPC Class Codes: C10B 43/06 from conduits, valves or the like
• CPC Class Codes: C10B 55/00 Coking mineral oils, bitumen, tar, and the like or mixtures thereof with solid carbonaceous material cracking oils C10G
• CPC Class Codes: C10G 75/00 Inhibiting corrosion or fouling in apparatus for treatment or conversion of hydrocarbon oils, in general C10G7/10, C10G9/16 take precedence
• CPC Class Codes: C10G 9/16 Preventing or removing incrustation
• CPC Class Codes: G05D 16/16 derived from the controlled fluid
• CPC Class Codes: G05D 7/0635 by action on throttling means G05D7/0688, G05D7/0694 take precedence

Abstract

Systems and methods for safe on-line pigging decoking of a coker furnace tubes and which also permits on-line spalling operations.

Claims

1. A system for on-line pigging of a tube coil for a furnace in a delayed coking system, which comprises:

a first pressurized steam source in fluid communication with the tube coil at a tube coil first end;

a main line in fluid communication with the tube coil at a tube coil second end and in fluid communication with an additional drum input line, the main line having a first isolation valve between the tube coil second end and the additional drum input line, the main line having a second isolation valve between the first isolation valve and the additional drum input line;

a third valve on a second line between a fourth valve and the main line, the fourth valve in fluid communication with the main line via the second line, the second line in fluid communication with the main line at a point between the tube coil second end and the first isolation valve;

a second pressurized steam source in fluid communication with the second line at a point between the third valve and the main line;

a third pressurized steam source in fluid communication with the fourth valve,

a fifth valve in fluid communication with the second line at a point between the fourth valve and the third valve and in fluid communication with a vent;

a third line in fluid communication with the main line between the first isolation valve and the second isolation valve and in fluid communication with a sixth valve;

a fourth line in fluid communication with the sixth valve and a closed blowdown system header;

a seventh valve between the closed blowdown system header and the sixth valve; and

a fifth pressurized steam source in fluid communication with an eighth valve, the eighth valve in fluid communication with the fourth line between the sixth valve and the seventh valve.

2. The system of claim 1, further comprising a ninth valve between the second pressurized steam source and second line.

3. The system of claim 2, further comprising a flow controller between the second pressurized steam source and the ninth valve.

4. The system of claim 3, further comprising a pressure controller between the third line and the fourth pressurized steam source.

5. The system of claim 4, wherein the first isolation valve is a ball valve and the high pressure end is the spring-loaded seat end of the valve and the second isolation valve is a ball valve and the high pressure end is the spring-loaded seat end of the valve.

6. The system of claim 4, wherein the flow controller comprises a flow orifice.

7. The system of claim 4, wherein the seventh valve is a flow regulating valve.

8. The system of claim 4, wherein the seventh valve is a globe valve.

9. The system of claim 4, wherein the furnace includes a plurality of coils.

10. The system of claim 4, wherein the pressure controller comprises a flow meter and a pressure regulator, the flow meter in fluid communication with a flow indicator, the pressure regulator in fluid communication with a pressure indicator.

11. The system of claim 4, wherein the flow controller further comprises a flow indicator.

12. The system of claim 4, wherein the first isolation valve, the second isolation valve and the main line are capable of withstanding the several thermal transients and time at elevated temperature of 1250°

F. or so during an on-line spalling.