Monthly Archives for July 2013

Corrosion Inhibitor

To clean up amine, the rate of particulate generation must be slowed and the iron sulfide already in the amine filtered out. Reducing corrosion rates is the way to do this. In one Midwestern refinery, the amine solution was thick … Continue reading

19. July 2013 by Jack
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Cleaning Up Amine

The iron sulfide particulates circulating in a dirty amine system have built up from a combination of factors. Foremost among these is inadequate filtering. There are three common types of filters: rotary precoat filters, cartridge filters, and stacked paper plates. … Continue reading

19. July 2013 by Jack
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Dirty Amine Ruins Operation

Running a sulfur recovery operation with dirty amine is analogous to deficit spending. You are borrowing against the future, but the day of reckon­ing will surely come. The insidious aspect of circulating dirty amine is its erosive nature. Carbon steel … Continue reading

19. July 2013 by Jack
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Dirty Amine

Symptoms of a dirty, corrosive amine system are: Carry-over of amine from the scrubbers. Dilution of the amine system with water due to reboiler leaks. Plugging of instrument taps with particulates in the amine. Loss of amine to the sewer … Continue reading

19. July 2013 by Jack
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Amine regeneration flowsheet

Figure 4-1 is a process flowsheet showing how amine solution is circu­lated to various refinery scrubbers to absorb H2S. The lean amine chemically combines with H2S (and unavoidably some C02) in the scrubbers. The resulting rich amine is stripped in … Continue reading

19. July 2013 by Jack
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Retrofitted combination tower to save energy

The hot coke drum vapors are a valuable source of high-level heat. This energy, which is partially recovered in the combination tower heavy gas-oil pumparound section, can be used for generating steam, preheating coker feed, or reboiling a gas plant. … Continue reading

19. July 2013 by Jack
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Explosion-Proof Trays

Coker fractionators are subject to damaging pressure surges due to accidental flashing of water. The pressure surges results in the tray decks “ripping” away from the tray support rings. Actually, the tray decks are not ripped away from the support … Continue reading

19. July 2013 by Jack
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Combination Tower

A delayed coker combination tower is similar in design and function to an ordinary crude distillation tower; heat is removed and products are fractionated. Referring to Figure 3-1, four products are made: wet gas, unstabilized naphtha or wild gasoline, furnace … Continue reading

19. July 2013 by Jack
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Vapor Line Restriction

Coke that builds up in the coke drum overhead vapor line is responsible for most of the back-pressure incidents. Operators find that tearing the insulation off these lines slows the rate at which coke deposits. A better method is to … Continue reading

19. July 2013 by Jack
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Wet Gas Compressor

Vapors from the coke drum must pressure their way through to the combination tower reflux drum. Any restriction to their flow will increase the operating pressure of the coke drum. To avoid exceeding the coke drum relief valve pressure, some … Continue reading

19. July 2013 by Jack
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