Speaker Van der Schaaf - EnergyDays - 27 October 2016
Information on speakers
dr.ir. J. (John) van der Schaaf
Production of Metals in the Future: Opportunities for Spinning Disc Technology
Production processes of metals are extremely energy intensive and are largely directly or indirectly fossil fuel based with a large CO2 footprint. If we want to revert to a renewable economy with energy originating from wind and solar plants, we need to change our ways of making metals. A solution to this is electrodeposition from salt solutions. However, the availability of renewable energy can be highly variable. Common practice in (chemical) industrial processes is to operate as close to steady state conditions as possible, which does not match the highly variable energy supply.
Spinning disc technology can solve this problem. Equipment based on this technology typically has low volume and high production rates, because of the exceptionally high mass and heat transfer rates that are obtained. Because of the low volume of the equipment, response times to operating conditions is extremely fast and highly fluctuating production capacities are easily accommodated.
The application of spinning disc technology to electrochemical zinc production and iron production is discussed. Additionally, a design in which the technology is used in an energy storage and release system based on hydrogen/oxygen is discussed.
John van der Schaaf did his PhD-study from 1994-1998 at Delft University of Technology on the J.M. Burgers Centre project "Dynamics of Gas-Solids Fluidized Beds - analysis of pressure fluctuations". Parallel to writing his thesis, he did postdoctoral research from 1998-2000 on the validation of computational fluid dynamics codes for gas-solid fluidized beds. He joined the Glass Technology group of Prof.dr.ir. R.G.C. Beerkens in 2000, where he did postdoctoral research on the formation of foam in glass melting furnaces, in cooperation with TNO. During this period he coached four PhD-students working on sulphur chemistry of glasses, foam production from waste incinerator fly-ash, and model-based predictive control of glass furnaces. He developed a thermodynamic model for prediction of activities in glass-melts, a physicochemical model for foam production and a physical model for foam build-up and breakdown. He started working as assistant professor (tenure track) in the group of Prof.dr.ir. J.C. Schouten in March 2003. Currently, he coaches PhD-students working on catalyst particle design and modeling and hydrodynamics and mass transfer in slurry bubble columns, foam structured packings, and multiphase flow in (structured) microreactors. His expertise is in multiphase flow physics, dynamic behavior of (multiphase) reactors and chemical engineering in general.