IMPLICATIONS OF NATURAL GAS INTERCHANGABILITY FOR CALIFORNIA GAS CUSTOMERS Industrial and Commercial Burners – GTI lead Appliances – LBNL lead David Rue, GTI, August 9, 2005

Interchangeability is Defined As - The ability to substitute one gaseous fuel for another in a combustion application without materially changing operational safety or performance and without materially increasing air pollutant emissions Source – NGC+ Working Group on Interchangeability White Paper presented to FERC, Feb. 2005

What Needs to be Learned? ApplicationConcernStatusNeed AppliancesMillions of unregulated units Studies made, results must be compared Testing of old, maladjusted, new units, emissions Commercial/ Industrial Burners Widest range of use, efficiency, emissions Not yet addressed Extensive testing Engines and Boilers Knock, efficiency, emissions, stable combustion Mobile engines studied, others not yet addressed Review mobile engine data and testing Turbines/ Microturbines Efficiency, emissions, turbine life FL study with full- scale turbines, DOE project? Collect turbine maker data and testing Non-combustion Uses Added process cost, plant modification Not yet addressed Market analysis and data collection

Industrial and Commercial Burners Often much high capacity than appliance burners Much more tightly controlled – air/fuel ratio is in range where small differences change performance Burners are always part of a combustion system Quest for efficiency and low emissions produces burner types sensitive to fuel gas changes Interchangeability indices will be different from those relevant to appliance burners

Industrial Burner Interchangeability Commercial and industrial combustion systems to be evaluated –Most process sensitivity with changing flame conditions –tightest emissions regulations will be identified –Greatest concern with stable operation Effects of fuel changes will be measured for –Operating characteristics – gases, blending, switching, air/fuel ratio, turn down. –Performance characteristics – flame length and shape, flame temperature, heat flux, flame stability, etc. –Regulatory characteristics – emissions, opacity, air quality, etc.

Project Tasks 1Planning for Industrial and Commercial Burner Interchangeability Study 2Organization of Study Activities 3Laboratory Equipment Set-Up 4Industrial/Commercial Burner and Control System In-Furnace Testing 5Industrial/Commercial Burner and Control System Chamber Testing 6Exposure Testing 7Analysis and Modeling

Task 1 The objective is to prepare for industrial and commercial burner interchangeability studies emphasizing burners of importance in California Work period – 3 months Start date – by Sept. 1, 2005 Participants – GTI.

Task 1 Activities Literature review – burner studies, protocols, indices proposed, etc. Review of industrial burners and control systems in common use –Review previous listing – including SoCalGas –Discuss with major burner makers Protocol selection, modification, and development Natural gas, LNG, unconventional gas ranges of composition and heating value for testing

Protocols Gas preparation, metering, blending, etc. Test procedures for burner operating conditions, test order, gas switching, control system operation, etc. Monitoring procedures to track flame characteristics and heat transfer Means to track emissions including NO x, CO, unburned hydrocarbons, particulates, and trace species

Collecting Information Gas data collected from gas industry sources, LNG suppliers, blending calculations Summarize and document available techniques for monitoring combustion equipment, suggest modifications as needed Monitoring procedures selected from available methods, then listed, modifications proposed as needed List standard emissions data collection methods and equipment that can be used

Final Product From Task 1 Final report containing Literature review on industrial burner interchangeability Burners and combustion systems with proposed sensitivity to interchangeability and prevalence in California Protocols and suggested modifications documented and ranked by proposed priority Natural gases, LNGs, and unconventional gases described along with basis for choices

Tasks 2 Through 7 Oversight committee of sponsors and experts will be formed Task 2 will –review Task 1 report and finalize ranking of burners, protocols, and gases, –Select tests and test methods –Define reporting needs Tasks 3-5 will involve testing and reporting Task 6 will focus on exposure testing and will include validation by LBNL Task 7 will involve analysis and modeling of industrial burners relative to interchangeability