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 1

Stoichiometric Firing “WHEN?”  Main Claus TR burner  Normal Operation sub-stoichiometric H 2 S  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 Porter McGuffie, Inc. Engineering Measurement and Analysis Services 2

WHAT DAMAGE???? Refractory Damage White Hot Pile Of Fallen Refractory (> 3000 F ) Porter McGuffie, Inc. Engineering Measurement and Analysis Services 3

WHAT DAMAGE???? Ferrule Damage Melted Ferrules (>3000 F) Porter McGuffie, Inc. Engineering Measurement and Analysis Services 4

Near 100% Stoichiometric Firing Temperatures can get real hot ESPECIALLY IF OXYGEN FIRED Porter McGuffie, Inc. Engineering Measurement and Analysis Services 5

3550°F 3600 3500 3400 LPG H2S Hydrogen (@ 100%) Natural Gas 2800°F 89% 103% 2800 Best Practice Refractory STOICHIOMETRY And Ferrule Material (Air Fired) Maximum Operating Temperature Normal Operating 2400°F Porter McGuffie, Inc. Engineering Measurement and Analysis Services 6

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 Porter McGuffie, Inc. Engineering Measurement and Analysis Services 7

M / LB OF NATURAL GAS MPERATURE, F ME TEMPE FLAME LBS OF STEAM AIR / NATURAL GAS, VOLUME RATIO Porter McGuffie, Inc. Engineering Measurement and Analysis Services 8

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 Porter McGuffie, Inc. Engineering Measurement and Analysis Services 9