Determination of transient fluid temperature and thermal stresses in pressure thick-walled elements using a new design thermometer / Magdalena Jaremkiewicz, Dawid Taler, Piotr Dzierwa, Jan Taler // Energies ... więcej

Determination of transient fluid temperature and thermal stresses in pressure thick-walled elements using a new design thermometer / Magdalena Jaremkiewicz, Dawid Taler, Piotr Dzierwa, Jan Taler // Energies [Dokument elektroniczny]. – 2019, Vol. 12, Iss. 2, 21 s. : schem., wykr. – Tryb dostępu: https://www.mdpi.com/1996-1073/12/2/222. – Bibliogr. 22 poz., Abstr. – Mat. konf.: XI International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018), Cracow, Poland , 21-24.05.2018. – doi: 10.3390/en12020222. – ISSN 1996-1073

In both conventional and nuclear power plants, the high thermal load of thick-walled elements occurs during start-up and shutdown. Therefore, the thermal stresses should be determined on-line during plant ... więcej

In both conventional and nuclear power plants, the high thermal load of thick-walled elements occurs during start-up and shutdown. Therefore, the thermal stresses should be determined on-line during plant start-up to avoid shortening the lifetime of critical pressure elements. It is necessary to know the fluid temperature and heat transfer coefficient on the internal surface of the elements, which vary over time to determine transient temperature distribution and thermal stresses in boilers critical pressure elements. For this reason, accurate measurement of transient fluid temperature is very significant, and the correct determination of transient thermal stresses depends to a large extent on it. Unfortunately, thermometers used in power plants are not able to measure the transient fluid temperature with adequate accuracy due to their massive housing and high thermal inertia. The article aims to present a new technique of measuring transient superheated steam temperature and the results of its application on a real object. The experimental research consisted in measuring the temperature of superheated steam after the second stage of superheater using the proposed measuring technique and commonly applied conventional industrial thermometers. By the steam temperature measurements carried out, thermal stresses occurring in the pipeline have been determined.