Publication detail
ANALYSIS OF HELICAL HEAT EXCHANGER WATER - SLUDGE BY CFD
PISKOVSKÝ, M. HÁJEK, J. KILKOVSKÝ, B. ELSAESSER, T. STEHLÍK, P.
Czech title
Analýza šroubovicového výměníku Voda-Kal pomocí CFD
English title
ANALYSIS OF HELICAL HEAT EXCHANGER WATER - SLUDGE BY CFD
Type
conference paper
Language
en
Original abstract
Thermal treatment of sludge represents a renewable energy source, which is presently widely investigated. However, thermal utilization of sludge requires some pre-treatment. The sludge has to be preheated and de-watered before combustion. The preheating has a significant effect on flocculation and consequently de-watering efficiency. In this work, we used a helical heat exchanger for the sludge preheating. Process water was used as the hot stream. Correlations necessary for design calculation of the helical heat exchanger were adopted from literature, in spite of some slight differences in the heat exchanger geometry. In order to validate and tune the design correlations, CFD simulations of the heat exchanger have been performed. Commercial code FLUENT 6.3 was used for all computations.
Czech abstract
Tepelné zpracování kalu představuje obnovitelný zdroj energie. Nicméně před vlastní utilizací kalu je nutné ho předběžně upravit. Kal musí být předehřát a odvodněn před jeho spalováním. Předehřev je důležitý pro flokulaci a s tím související účinnost odvodnění. V této práci jsme pro tento předehřev použili šroubovicový výměník tepla. Jako horký proud byla použita procesní voda. Vztahy nutné pro návrh zařízení byly převzaty z literatury Correlations necessary for design calculation of the helical heat exchanger were adopted from literature. Jelikož geometrie zařízení neodpovídá zcela předpokladům pro zvolené vztahy, byl použity metody CFD pro ověření vhodnosti těchto vztahů při dané aplikaci. Pro veškeré simulační výpočty byl použit FLUENT 6.3.
English abstract
Thermal treatment of sludge represents a renewable energy source, which is presently widely investigated. However, thermal utilization of sludge requires some pre-treatment. The sludge has to be preheated and de-watered before combustion. The preheating has a significant effect on flocculation and consequently de-watering efficiency. In this work, we used a helical heat exchanger for the sludge preheating. Process water was used as the hot stream. Correlations necessary for design calculation of the helical heat exchanger were adopted from literature, in spite of some slight differences in the heat exchanger geometry. In order to validate and tune the design correlations, CFD simulations of the heat exchanger have been performed. Commercial code FLUENT 6.3 was used for all computations.
Keywords in English
CFD, Helix heat exchanger, Sludge, Waste to energy
RIV year
2007
Released
18.04.2007
Location
Chambery, FR
Book
Proceedings of Heat-SET 2007
Pages from–to
471–482
Pages count
11
BIBTEX
@inproceedings{BUT22449,
author="Martin {Piskovský} and Jiří {Hájek} and Bohuslav {Kilkovský} and Thomas {Elsässer} and Petr {Stehlík},
title="ANALYSIS OF HELICAL HEAT EXCHANGER WATER – SLUDGE BY CFD",
booktitle="Proceedings of Heat-SET 2007",
year="2007",
month="April",
pages="471--482",
address="Chambery, FR"
}