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Optymalizacja parametrów technologicznych filtra z granulowanym złożem polistyrenowym do uzdatniania wody kotłowej (studium przypadku)

Trach Yuliya, Wichowski Piotr

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2019

Vol. 28, No. 3

476--487

W artykule przedstawiono badania mające na celu określenie optymalnych parametrów technologicznych filtra wstępnego oczyszczania wody gorącej dla analizowanego obiegu wody kotłowej. Dla analizowanego przypadku optymalne parametry wynoszą: uziarnienie złoża polistyrenowego d = 1,25 mm, prędkość filtracji V = 7,0 m·h–1, wysokość warstwy filtracyjnej H = 1,2 m. Zastosowanie polistyrenowego złoża filtracyjnego pozwala na uzyskanie porównywalnej efektywności uzdatniania wody w stosunku do tradycyjnie stosowanego piasku kwarcowego. Analiza kinetyki usuwania zanieczyszczeń wykazała, że przy fi ltracji wody przez złoże polistyrenowe w kierunku od dołu do góry występują dwie strefy: w dolnej dominuje proces mechanicznego osadzania utlenionego żelaza, w górnej obniżanie stężenia ChZT.

The article presents research to determine the optimal technological parameters of the hot water pre-treatment filter for the analyzed boiler water cycle. For the analyzed case, the optimal parameters are: the grain size of the polystyrene bed d = 1.25 mm, the filtration speed V = 7.0 m·h–1, the height of the filtration layer H = 1.2 m. The use of a polystyrene filter bed allows obtaining comparable efficiency of water treatment in relation to the traditionally used quartz sand. Analysis of the kinetics of pollution removal showed that during filtration of water through the polystyrene bed in the direction from the bottom up there are two zones: the lower zone is dominated by the process of mechanical deposition of oxidized iron, the upper by reduction of the COD concentration.

Experimental determination of the kinetics of sorption and gas filtration in coal

Gawor M.

Studia Geotechnica et Mechanica

2018

Vol. 40, nr 4

254--262

The paper presents tests set-ups for experiments on sorption kinetics and gas filtration kinetics in a porous medium. It was observed that two phenomena occur in these processes: transportation of gas into the porous solid and settling of gas molecules on the walls of the solid or within its volume. An experiment was carried out in which a thin resistance thermometer was quickly taken out of an argon stream and placed in carbon dioxide or the other way round. The measurement made it possible to determine the sorption time constant. It was demonstrated that the sorption rate is much higher than the filtration rate. Thus, filtration is the process describing the rate at which gas molecules penetrating the porous substance are adsorbed or desorbed. The sorption time constant is not >50 m. In the second experiment, the author determined the rate at which gas is liberated from coal grains. The measurement method was based on measurement of the pressure of desorbing gas in constant volume. The experiment involved measurement of the pressure of the gas liberated from the coal grains in a closed chamber. The kinetic curves obtained in this way were used to determine the carbon dioxide coefficient in coal grains. During the experiment, particular focus was put on the initial stage of gas liberation (up to 0.4 s). The slower process of gas transporting in the porous structure of coal is the transporting of gas through a coal briquette. Experimentally implemented variety of boundary conditions allowed for a more complete verification of the assumed theoretical model and possibly for the exact determination of filtration parameters. The experimental set-up built for this purpose, allows for pressure and temperature measurement on the briquette side surface.