Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Polish Journal of Chemical Technology

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Heat transfer investigations in a liquid that is mixed by means of a multi-ribbon mixer

Borowski Tomasz, Sołoducha Dawid, Musik Daniel, Wójcik Krzysztof, Chyla Mariusz, Ziętarska Katarzyna, Friedrich Małgorzata, Kiełbus-Rąpała Anna, Kordas Marian, Konopacki Maciej, Rakoczy Rafał

Polish Journal of Chemical Technology

2021

Vol. 23, nr 2

66--72

The objective of this paper is to present the investigations of the heat transfer process carried out by means of the multi-ribbon mixer. It is shown that the heat transfer process for the synergic effect of the mixing process and the flowing liquid through the mixer has significantly higher values of the heat transfer coefficients than the mixer with motionless impellers. The empirical correlations between the heat transfer coefficient and the operational parameters obtained in this work can provide guidance for the design and operation of an apparatus equipped with the multi-ribbon impeller. These empirical correlations can be used to predict the heat transfer coefficient for the multi-ribbon mixer.

Odour emission from primary settling tanks after air-tightening

Friedrich Małgorzata, Mizerna-Nowotna Paulina, Latzke Filip

Polish Journal of Chemical Technology

2020

Vol. 22, nr 4

22--27

The purpose of the present article was to determine odour emission rate from primary settling tanks after hermetisation. The paper presents the results of the research on odour emission from four settling tanks, covered with self-supporting aluminium domes with a diameter of 52 meters, located on urban wastewater treatment plants, with the planned ﬂow capacity equal to 200 000 m3/day. Altogether, the olfactometry analysis of 189 samples of polluted air pulled from the domes with the use of an air blower which has efﬁciency of 12 000 m3/h was conducted. The results of odour concentration measurements were in a range of approximately 10 800 to 763 600 ouE/m3. Average odour emission rate was equal to 102 ouE/(s · m2). The obtained value is much higher than the literature data, available for non-hermetised settlers only. This rate enables better estimation of the odour stream that has to be deodorised after sealing the settling tanks.