Continuous Improvement in Aluminium Reduction Cell Process Performance using the ALPSYS® ControlrnSystem

摘要

Improving cell productivity through increased current generallyrnleads to higher anode current densities, lower bath to amperagernratios and changed cell dynamics. Up-to-date process control isrnrequired to maintain or improve existing performance under thesernincreasingly challenging conditions.rnThe ALPSYS® control system has been continuously improved torncope with these new constraints. This system provides innovativernsolutions to increase cell productivity while moving towards zerornanode effects.rnThis paper shows how large-scale deployment of the latestrnalumina control developments has resulted in a significantrnreduction in anode effect rate while increasing cell productivity inrnthe Alma smelter. It also shows how sharing of best practices forrnanode effect treatment has halved anode effect duration in all RiornTinto Alcan plants using AP Technology. Hence, even forrnbenchmark cell technology, effective process control can furtherrnimprove current efficiency while reducing greenhouse gasrnemissions.