Temat: pressure-drop method - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Study on gas holdup characteristics of micro-bubble countercurrent contacting flotation column
Autorzy:: Han, Jikang
Wang, Weizhi
Li, Ran
Powiązania:: https://bibliotekanauki.pl/articles/1449071.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: column flotation
conductance method
pressure drop method
gas holdup
GE-609
Opis:: In order to explore the gas holdup distribution of the microbubble countercurrent contact flotation column in the hematite column cationic reverse flotation process, respectively using conductance method and pressure drop method for air and water as experimental medium characteristics research of flotation column, the research group carries on the gas holdup, examines the aeration quantity, the fill medium and cation collector alkyl polyamine ether (An amine collector―GE609 which consists of four elements: carbon, hydrogen, oxygen and nitrogen)within the column on the influence of the axial and radial gas holdup. The results show that the axial gas holdup from the bottom of the column to the top of the column increases with the increase of height in the range of 0.050.07dm3/s. The radial distribution of gas holdup generally shows the distribution law of “intermediate high, low on both sides”. After the filling medium is added into the column, the radial gas holdup is evenly distributed compared with the empty column, and the gas holdup is increased. Due to the high foaming performance of GE-609, the gas holdup in the column can be increased by changing the amount of aeration and the concentration of the reagent, which can exceed 60% at the maximum. Like other alcohol foaming agents, as time passes, the effect of GE-609 weakens and the gas holdup in the column gradually decreases. The addition of quantitative HCl can improve the foaming performance of GE-609, and the gas holdup in the column is significantly improved and the stability is enhanced.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 4; 665-675
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Risks of boiler operation during slagging and fouling process – a new methods for the determination of ash sintering temperatures
Autorzy:: Urbanek, B.
Szydełko, A.
Czajka, K.
Powiązania:: https://bibliotekanauki.pl/articles/115821.pdf
Data publikacji:: 2013
Wydawca:: Fundacja na Rzecz Młodych Naukowców
Tematy:: mineral matter
sintering
fouling
Leitz test
strength method
pressure-drop method
materia mineralna
proces spiekania
zanieczyszczenia
test Leitz
metoda sił
metoda spadku ciśnienia
Opis:: The properties of mineral matter occurs in coal in the form of inorganic compounds leads to slagging and fouling process on boiler heating surfaces, burners and ash hopper. The deposition of ash cause many undesirable phenomena such as heat transfer deterioration, damage to internal parts of the boiler as a result of detachment of large agglomerates and finally, costly shutdowns of the boiler. Standardized method of risk assessment of agglomerates formation and sintered fly ash is determined by four melting temperatures of ash. This measurement is based on visual appraisal of ash sample deformation which is subjective and strongly depends on the experience of the person conducting the test. Especially is hard predict the first two temperatures: deformation and sintering. An article has to present three non-standardized methods for determining the sintering temperature by using physical parameters: pressure drop and minimum force of probe destruction. This type of measurement allows a quantitative way to obtain reliable and meaningful result. The experiment showed that the results of non-standard methods deviate from those set using the Leitz method. This allows to conclude that sintering processes occur at much lower temperatures and changing the shape of the initial (test method Leitz) is not the first symptom of demonstrating the melting of the ash.
Źródło:: Challenges of Modern Technology; 2013, 4, 2; 47-52
2082-2863
2353-4419
Pojawia się w:: Challenges of Modern Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Application of a modified OxiTop® respirometer for laboratory composting studies
Wykorzystanie zmodyfikowanego systemu OxiTop® do laboratoryjnych badań procesu kompostowania
Autorzy:: Malińska, K.
Powiązania:: https://bibliotekanauki.pl/articles/205060.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: respiration tests
oxygen respiration rate
pressure drop method
OxiTop® respirometer
composting
biodegradation
test oddychania
test respirometryczny
szybkość oddychania tlenem
metoda spadku ciśnienia
system OxiTop®
kompostowanie
biodegradacja
Opis:: This study applied a modified OxiTop® system to determine the oxygen uptake rate during a 2-day respiration test of selected composting materials at different moisture contents, air-filled porosities and composition of composting mixtures. The modification of the OxiTop® respirometer included replacement and adjustment of a glass vessel (i.e. a 1.9-L glass vessel with wide mouth was used instead of a standard 1-L glass bottle, additionally the twist-off vessel lid was adjusted to attach the measuring head) and application of a closed steel mesh cylinder of 5 cm in diameter and 10 cm in height with the open surface area of the mesh of approximately 56.2%. This modification allowed obtaining different bulk densities (and thus air-porosities) of the investigated composting materials in laboratory composting studies. The test was performed for apple pomace and composting mixtures of apple pomace with wood chips at ratios of 1:0.5, 1:1, 1:1.5 (d.w), moisture contents of 60%, 65% and 75% and air-filled porosities ranging from 46% to 1%. Due to diverse biodegradability of the investigated apple pomace and composting mixtures this test allows for the determination of the effects of different air-porosities (due to compaction in a pile) on the oxygen uptake rate for mixtures with a fixed ratio of a bulking agent. The described method allows for laboratory determination of the effects of moisture content and compaction on biodegradation dynamics during composting.
W przedstawionych badaniach wykorzystano zmodyfikowany system OxiTop® do wyznaczenia szybkości oddychania w oparciu o zużycie tlenu podczas 2-dniowego testu respirometrycznego dla wybranych materiałów przeznaczonych do kompostowania o różnym składzie mieszanek, zawartości wody i porowatości. Modyfikacja systemu OxiTop® dotyczyła dostosowania szklanego naczynia oraz jego wyposażenie w cylinder w kształcie walca o średnicy 5 cm i wysokości 10 cm, wykonanego z siatki stalowej (oczka siatki stanowiły ok. 56,2% całkowitej powierzchni). Ta modyfikacja pozwoliła na uzyskiwanie różnych gęstości nasypowych (a tym samym porowatości) badanych materiałów w skali laboratoryjnej. Test respirometryczny został przeprowadzony dla wytłoków jabłkowych i mieszanek wytłoków jabłkowych i ścinek drzewnych w stosunku 1:0,5, 1:1, 1:1,5 (s.m) i zawartości wody 60%, 65% i 75% oraz porowatości w zakresie od ok. 46% do ok. 1%. Z uwagi na różną podatność badanych mieszanek na biodegradację, możliwe było określenie wpływu zmian porowatości powietrznej (spowodowanych kompakcją) na szybkość zużycia tlenu dla mieszanki o stałym udziale czynnika strukturotwórczego. Przedstawiona metoda pozwala na laboratoryjne badanie wypływu zawartości wody i kompakcji na biodegradację podczas kompostowania.
Źródło:: Archives of Environmental Protection; 2016, 42, 1; 56-62
2083-4772
2083-4810
Pojawia się w:: Archives of Environmental Protection
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Heat transfer in helical coil heat exchanger:An experimental parametric study
Autorzy:: Kowalski, Krzysztof
Downarowicz, Dorota
Powiązania:: https://bibliotekanauki.pl/articles/185443.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: helical coil
heat exchanger
condensation
Wilson method
laminar flow
pressure drop
wymiennik ciepła
kondensacja
Metoda Wilsona
przepływ laminarny
Spadek ciśnienia
Opis:: Helical coil heat exchangers are widely used in a variety of industry applications such as refrigerationsystems, process plants and heat recovery. In this study, the effect of Reynolds number and theoperating temperature on heat transfer coefficients and pressure drop for laminar flow conditions wasinvestigated. Experiments were carried out in a shell and tube heat exchanger with a copper coiledpipe (4 mm ID, length of 1.7 m and coil pitch of 7.5 mm) in the temperature range from 243 to 273 K.Air – propan-2-ol vapor mixture and coolant (methylsilicone oil) flowed inside and around the coil,respectively. The fluid flow in the shell-side was kept constant, while in the coil it was varied from 6.6to 26.6 m/s (the Reynolds number below the critical value of 7600). Results showed that the helicalpipe provided higher heat transfer performance than a straight pipe with the same dimensions. Theconvective coefficients were determined using the Wilson method. The values for the coiled pipe werein the range of 3–40 W/m2·K. They increased with increasing the gas flow rate and decreasing thecoolant temperature.
Źródło:: Chemical and Process Engineering; 2019, 40, 1; 101--114
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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