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Investigation of flow behaviour of homogeneous and heterogeneous ash slurries: fly and bottom ash Porici
Chára, Zdeněk ; Vlasák, Pavel ; Konfršt, Jiří
The flow behaviour of fly ash and bottom ash from fluidic combustion slurries was experimentally investigated for laminar, transitional and turbulent regimes with respect to the effect of solid concentration, particle size distribution and time and intensity of shearing in smooth stainless steel pipes of inner diameter of 26.8 and 36 mm. Volumetric concentration ranges from 20 to 32 %, slurry velocity reach value up to 5 m/s. It was demonstrated that turbulent shearing or addition of bottom ash results in the significant decrease of the apparent viscosity; also laminar/turbulent transition region was reached for lower flow velocity.
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Transition Phenomena in Trickle Bed Reactor under Steady Stay Gas/liquid Downflow. Part 1
Jiřičný, Vladimír ; Staněk, Vladimír ; Ondráček, Jakub ; Vychodilová, Hana ; Křišťál, Jiří ; Stavárek, Petr ; Vlček, Dalibor ; Karfík, David ; Lederer, J. ; Šimek, J.
Experimental measurement of co current gas/liquid downflow under conditions of steady state. Measurement of the effect of liqud physical properties and type od packing on pressure drop profile along the packed bed layer.
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The Rating of the Relation between the Composition of Solid Matter in the Atmosphere and Their Sources in Selected Areas of Prague
Tydlitát, Vratislav ; Pekárek, Vladimír ; Schwarz, Jaroslav ; Šyc, Michal ; Vosecký, Martin
From eght chemical composition of aerosols PM10 and PM2,5 from two areas in Prague on the end of winter and in sommer in analogy with statistical analyses of other authors it was concluded which are possible sources of aerosols in the areas of measurement. For chemical analysis AAS, iont chromatography and X-ray fluorescence methods were used..Soil dust and fine silicates there are a very probable source of aerosols . In connection with realisation of a few measurements the existence of other sources (heating, traffic, cment kiln, industry, ammonium sulphate, nitrate iont) is discussed.
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Asessment of the Relation between the Composition of Aerosols of Solids in Air and Their Sources on Selected Places in Prague
Tydlitát, Vratislav ; Pekárek, Vladimír ; Šyc, Michal ; Vosecký, Martin
Results of the twentyfour hour sampling of aerosols at two posts in Prague: on a street with large traffic and at a post near to cement plant are presented. In aerosols PM10 a PM2,5 adsorbed from 500 to 1000 m3 of air (20 to 40 mg) were determined contents of As,Cd, Cr,Cu, Mn, Ni, Pb, Al, Ca, Fe, K, Mg, Na, Zn by the method of atomic absorption spectrometry. From x-ray fluorescence analyze were assesed contents of Si, S and Cl.. The winter traffic is the source of aerosol wth content of NaCl and SiO2 , Fe, Ca. In the vicinity of cement plant the aerosol contents elements, which are in cement and elements fom combustion: K, Ca, Al and S.
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