Stoichiometric Firing Damage in Claus Unit 2016 LAURANCE REID GAS - - PowerPoint PPT Presentation

Porter McGuffie, Inc.

Engineering Measurement and Analysis Services

Stoichiometric Firing Damage in Claus Unit

2016 LAURANCE REID GAS CONDITIONING CONFERENCE Dennis Martens & Mike Porter Porter McGuffie, Inc. www.pm-engr.com

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Porter McGuffie, Inc.

Engineering Measurement and Analysis Services

Stoichiometric Firing “WHEN?”

 Main Claus TR burner

 Normal Operation sub-stoichiometric H2S  Abnormal Operation OFF RATIO’s

 Hydrocarbon in feed  Incorrect 2 zone operation

 Starting up Near Stoichiometric fuel gas  Hot Standby Near Stoichiometric fuel gas

 Inline Burners

 Same Sub Set as Main Burner above

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WHAT DAMAGE????

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Refractory Damage White Hot Pile Of Fallen Refractory (> 3000 F)

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WHAT DAMAGE????

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Ferrule Damage Melted Ferrules (>3000 F)

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Near 100% Stoichiometric Firing Temperatures can get real hot ESPECIALLY IF OXYGEN FIRED

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3550°F

Normal Operating 2400°F

89% 103%

STOICHIOMETRY (Air Fired)

Hydrogen LPG Natural Gas H2S

(@ 100%)

Best Practice Refractory And Ferrule Material Maximum Operating Temperature

2800°F

3600 3500 2800 3400

Porter McGuffie, Inc.

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So what do you do to keep from destroying the equipment? Temper the combustion temperature with inerts; steam or nitrogen or recycled tail gas/process gas Example graph of a Natural Gas steam tempered combustion temperature

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LBS OF STEAM M / LB OF NATURAL GAS

AIR / NATURAL GAS, VOLUME RATIO

FLAME ME TEMPE MPERATURE, F

Porter McGuffie, Inc.

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Excessive Temperature

Moral OF THIS STORY!! KEEP YOUR COOL BY TEMPERING!!

References:

 Burner Flame Temperature During Warm Up And Hot

Standby by Alan D. Mosher Presented at 2011 Brimstone Vail Conference

 Designing A Robust Waste Heat Boiler by Dennis

Martens and Mike Porter Presented at 2015 Laurance Reid Gas Conditioning Conference Both of these papers have additional references listed

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