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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Perfluorocarbon Generation and Emissions from Industrial Processes
Presentation Title New Algorithm for Calculating CF4 Emissions from High Voltage Anode Effects
Author(s) Jerry Marks, Pernelle Nunez
On-Site Speaker (Planned) Jerry Marks
Abstract Scope Current Tier 2 algorithms calculate CF4 emission factors based on average anode effect minutes or average millivolts Overvoltage per cell day. Both the “slope” and “overvoltage” algorithms are based on the assumption that CF4 emission rates remain constant for anode effect durations ranging from less than one second to more than 1000 seconds. Detailed analysis of PFC measurements made over the past decade has shown conclusively that CF4 emission rates decrease rapidly with increasing reported anode effect duration. This study analyzes measurement data from individual anode effects from more than 2000 individual anode effects from more than 30 different measurements to develop a new exponential algorithm that better reflects changes in emission rate with anode effect duration. The exponential calculation should prove to be more robust resulting in more accurate calculation of PFC emissions than previous models.
Proceedings Inclusion? Planned: Light Metals


An Estimation of PFC Emission by Rare Earth Electrolysis
Attributing PFC Emissions to Different Industries: How Bottom-up Trends Can Complicate Top-down Analyses
Challenges in Estimating Global CF4 and C2F6 Emissions
Conditions and Mechanisms of Gas Emissions from Didymium Electrolysis and Its Process Control
Evaluation of Time Consistency when Quantifying Emissions of Perfluorocarbons Resulting from Low Voltage Anode Effects
Fluorinated Gas Production: Underestimated Source of PFCs?
Low Voltage PFC Measurements and Potential Alternative to Reduce Them at Alcoa Smelters
Methodologies to Measure Greenhouse Gas (GHG) Emissions from Industrial Processes and Determine the GHG Emission Factors
New Algorithm for Calculating CF4 Emissions from High Voltage Anode Effects
New Approach for Quantification of Perfluorocarbons Resulting from High Voltage Anode Effects
Perfluorocarbon Formation during Rare Earth Electrolysis
PFC Emission Reduction in the Semiconductor Industry
PFC Evolution Characteristics during Aluminium and Rare Earth Electrolysis
PFCs from the Chinese Aluminium Sector – Challenges in Emissions Accounting and Further Characteristics
Updated Factors for Calculating PFC Emissions from Primary Aluminum Production
Validation of Online Monitoring of PFC by QCL with FTIR Spectroscopy

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