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Three-dimensional modeling of biomass fuel flow in a circulating fluidized bed furnace
(Lappeenranta University of Technology, 2015-06-25)
The reduction of greenhouse gas emissions in the European Union promotes the
combustion of biomass rather than fossil fuels in energy production. Circulating fluidized
bed (CFB) combustion offers a simple, flexible and ...
Design and Simulation of High-Speed Rotating Electrical Machinery
(Lappeenranta University of Technology, 2016-01-22)
Global energy consumption has been increasing yearly and a big portion of it
is used in rotating electrical machineries. It is clear that in these machines
energy should be used efficiently. In this dissertation the aim ...
AMB system for high-speed motors using automatic commissioning
(Lappeenranta University of Technology, 2012-12-18)
The general trend towards increasing e ciency and energy density drives the industry to
high-speed technologies. Active Magnetic Bearings (AMBs) are one of the technologies
that allow contactless support of a rotating ...
Development of hydrometallurgical reactor leaching for recovery of zinc and gold
(Lappeenranta University of Technology, 2016-12-16)
Hydrometallurgical methods offer promising techniques for resolving the challenge of producing
metals essential to modern life in an environmentally and economically sustainable manner.
Leaching has a central role in ...
EDTA- and DTPA-functionalized silica gel and chitosan adsorbents for the removal of heavy metals from aqueous solutions
(Lappeenranta University of TechnologyLaboratory of Green Chemistry, 2011-08-05)
Adsorbents functionalized with chelating agents are effective in removal of heavy metals from aqueous solutions. Important properties of such adsorbents are high binding affinity as well as regenerability. In this study, ...
Fusion weld metal solidification:Continuum from weld interface to centerline
(Lappeenranta University of Technology, 2008-03-07)
We present a brief résumé of the history of solidification research and key factors affecting the solidification of fusion welds. There is a general agreement of the basic solidification theory, albeit differing - even ...
Broadband excitation in the system identification of active magnetic bearing rotor systems
(Lappeenranta University of Technology, 2011-11-04)
One of the targets of the climate and energy package of the European Union is to increase the energy efficiency in order to achieve a 20 percent reduction in primary energy use compared with the projected level by 2020. ...
Modeling of non-isothermalvapor membrane separation with thermodynamic models and generalized mass transfer equations
(2002-05-30)
A rigorous unit operation model is developed for vapor membrane separation. The new model is able to describe temperature, pressure, and concentration dependent permeation as wellreal fluid effects in vapor and gas separation ...
Modeling and Parameter Estimation of Double-Star Permanent Magnet Synchronous Machines
(Lappeenranta University of Technology, 2014-03-05)
The power rating of wind turbines is constantly increasing; however, keeping the voltage rating at
the low-voltage level results in high kilo-ampere currents. An alternative for increasing the power
levels without raising ...
Applying the principles of life cycle assessment and costing in process modeling to examine profit-making capability
(2007)
Static process simulation has traditionally been used to model complex processes for various purposes. However, the use of static processsimulators for the preparation of holistic examinations aiming at improving profit-making ...