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The measurement of the heterogeneous particles in the steam
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SYSNO ASEP 0522234 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title The measurement of the heterogeneous particles in the steam Author(s) Bartoš, Ondřej (UT-L) RID
Hrubý, Jan (UT-L) RID, ORCID
Ždímal, Vladimír (UCHP-M) RID, ORCID, SAI
Kolovratník, Michal (UT-L)
Jiříček, I. (CZ)
Moravec, Pavel (UCHP-M) RID, ORCID, SAI
Zíková, Naděžda (UCHP-M) RID, ORCID, SAINumber of authors 7 Source Title Sborník XX. výroční konference České aerosolové společnosti,. - Praha : Česká aerosolová společnost, 2019 / Vlčková L. - ISBN 978-80-270-6416-8 Pages s. 82-87 Number of pages 6 s. Publication form Print - P Action Výroční konference České aerosolové společnosti /20./ Event date 30.10.2019 - 01.11.2019 VEvent location Velké Bílovice Country CZ - Czech Republic Event type EUR Language eng - English Country CZ - Czech Republic Keywords heterogeneous nucleation ; steam turbine ; ultrafine aerosol particles Subject RIV BJ - Thermodynamics OECD category Mechanical engineering Subject RIV - cooperation Institute of Chemical Process Fundamentals - Air Pollution ; Quality R&D Projects GA17-19798S GA ČR - Czech Science Foundation (CSF) TN01000007 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) Institutional support UT-L - RVO:61388998 ; UCHP-M - RVO:67985858 Annotation The aim of this extended abstract is to reveal the work done as cooperation between several institutions which was presented and published in recent years (Kolovratník, 2014). The formation of droplets in low-pressure steam turbines has a significant impact on the efficiency of energy conversion due to the strongly nonequilibrium nature of this process . The condensed water also erodes the turbine blades. A very important question is to what extent heterogeneous nucleation contributes to the phase transition process . In the case of heterogeneous nucleation , the number of droplets depends only on the number of h eterogeneous particles in the system, whereas in the case of homogeneous nucleation, the number of created droplets is determined rather by the expansion rate - in a faster expansion, greater supersaturation and more droplets are formed until the released condensation enthalpy quenches the nucleation.
The specific number of droplets (number of droplets per unit mass of steam) formed in the turbine can be determined by optical probes, developed first by Walters and later in the Czech Republic improved by Petr and Kolovratník. Until recently, no information was available on the relative importance of heterogeneous nucleation in forming these droplets.Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2020 Electronic address http://cas.icpf.cas.cz/download/Sbornik_VKCAS_2019.pdf
Number of the records: 1