In order to ensure consistent argon flow in the stopper gas channel and improve argon bubble performance in the slab casting mould,two patented new technologies CSC（Clean Stream Cartridge） and SHP（Slot Hole Plug） ...In order to ensure consistent argon flow in the stopper gas channel and improve argon bubble performance in the slab casting mould,two patented new technologies CSC（Clean Stream Cartridge） and SHP（Slot Hole Plug） were applied in the argon purging stopper designs.The novel stopper designs can maintain a stable back pressure and argon flow in the argon line during long sequence casting,eliminate pressure increasing at the start of the casting,even distribute gas bubbles in the mould leading to improved mould flux melting and lubrication,reduce mould level fluctuation and so on.展开更多
A particle sub-model describing the bed characteristics of a bubbling fluidised bed is presented. Atomisation air, applied at high pressures via a nozzle positioned above the bed for spray formation, is incorporated i...A particle sub-model describing the bed characteristics of a bubbling fluidised bed is presented. Atomisation air, applied at high pressures via a nozzle positioned above the bed for spray formation, is incorporated in the model since its presence has a profound influence on the bed characteristics, though the spray itself is not yet considered. A particle sub-model is developed using well-known empirical relations for particle drag force, bubble growth and velocity and particle distribution above the fluidised-bed surface. Simple but effective assumptions and abstractions were made concerning bubble distribution, particle ejection at the bed surface and the behaviour of atomisation air flow upon impacting the surface of a bubbling fluidised bed, The model was shown to be capable of predicting the fluidised bed characteristics in terms of bed heights, voidage distributions and solids volume fractions with good accuracy in less than 5 min of calculation time on a regular desktop PC. It is therefore suitable for incorporation into general process control models aimed at dynamic control for process efficiency and product quality in top-spray fluidised bed coating processes.展开更多
文摘In order to ensure consistent argon flow in the stopper gas channel and improve argon bubble performance in the slab casting mould,two patented new technologies CSC（Clean Stream Cartridge） and SHP（Slot Hole Plug） were applied in the argon purging stopper designs.The novel stopper designs can maintain a stable back pressure and argon flow in the argon line during long sequence casting,eliminate pressure increasing at the start of the casting,even distribute gas bubbles in the mould leading to improved mould flux melting and lubrication,reduce mould level fluctuation and so on.
基金the financial support of the Special Research Fund (BOF) of the Ghent University
文摘A particle sub-model describing the bed characteristics of a bubbling fluidised bed is presented. Atomisation air, applied at high pressures via a nozzle positioned above the bed for spray formation, is incorporated in the model since its presence has a profound influence on the bed characteristics, though the spray itself is not yet considered. A particle sub-model is developed using well-known empirical relations for particle drag force, bubble growth and velocity and particle distribution above the fluidised-bed surface. Simple but effective assumptions and abstractions were made concerning bubble distribution, particle ejection at the bed surface and the behaviour of atomisation air flow upon impacting the surface of a bubbling fluidised bed, The model was shown to be capable of predicting the fluidised bed characteristics in terms of bed heights, voidage distributions and solids volume fractions with good accuracy in less than 5 min of calculation time on a regular desktop PC. It is therefore suitable for incorporation into general process control models aimed at dynamic control for process efficiency and product quality in top-spray fluidised bed coating processes.
