Temat: waterwall - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The influence of manual metal arc multiple repair welding of long operated waterwall on the structure and hardness of the heat affected zone of welded joints
Autorzy:: Pikuła, J.
Łomozik, M.
Pfeifer, T.
Powiązania:: https://bibliotekanauki.pl/articles/353851.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: repair welding
waterwall
manual metal arc welding
power engineering
HAZ
Opis:: Welded installations failures of power plants, which are often result from a high degree of wear, requires suitable repairs. In the case of cracks formed in the weld bead of waterwall, weld bead is removed and new welded joint is prepared. However, it is associated with consecutive thermal cycles, which affect properties of heat affected zone of welded joint. This study presents the influence of multiple manual metal arc welding associated with repair activities of long operated waterwall of boiler steel on properties of repair welded joints. The work contains the results of macro and microscopic metallographic examination as well as the results of hardness measurements.
Źródło:: Archives of Metallurgy and Materials; 2017, 62, 1; 327-333
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Rate of corrosion of waterwalls in supercritical pulverised fuel boilers
Autorzy:: Pronobis, M.
Litka, R.
Powiązania:: https://bibliotekanauki.pl/articles/185539.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: kurtyna wodna
kotły nadkrytyczne
kotły podkrytyczne
korozja
waterwall
subcritical boilers
supercritical boilers
corrosion
Opis:: This paper presents an analysis of the corrosion hazard in the burner belt area of waterwalls in pulverised fuel (PF) boilers that results from low-NOx combustion. Temperature distributions along the waterwall tubes in subcritical (denoted as SUB) and supercritical (SUP) boilers were calculated and compared. Two hypothetical distributions of CO concentrations were assumed in the near-wall layer of the flue gas in the boiler furnace, and the kinetics of the waterwall corrosion were analysed as a function of the local temperature of the tubes. The predicted rate of corrosion of the boiler furnace waterwalls in the supercritical boilers was compared with that of in the subcritical boilers.
Źródło:: Chemical and Process Engineering; 2012, 33, 2; 263-277
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Simulation of heat transfer in combustion chamber waterwall tubes of supercritical steam boilers
Autorzy:: Grądziel, S.
Majewski, K.
Powiązania:: https://bibliotekanauki.pl/articles/185848.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: waterwall tube
supercritical steam boiler
mathematical model
energy balance
thermal load
rura ekranowa
kocioł parowy
model matematyczny
balans energetyczny
obciążenie cieplne
Opis:: The paper presents the results of numerical computations performed for the furnace chamber waterwalls of a supercritical boiler with a steam output of 2400 x 10[3] kg/h. A model of distributed parameters is proposed for the waterwall operation simulation. It is based on the solution of equations describing the mass, momentum and energy conservation laws. The aim of the calculations was to determine the distribution of enthalpy, mass flow and fluid pressure in tubes. The balance equations can be brought to a form where on the left-hand side space derivatives, and on the right-hand side – time derivatives are obtained. The time derivatives on the right-hand side were replaced with backward difference quotients. This system of ordinary differential equations was solved using the Runge-Kutta method. The calculation also takes account of the variable thermal load of the chamber along its height. This thermal load distribution is known from the calculations of the heat exchange in the combustion chamber. The calculations were carried out with the zone method.
Źródło:: Chemical and Process Engineering; 2016, 37, 2; 199-213
0208-6425
2300-1925
Pojawia się w:: Chemical and Process Engineering
Dostawca treści:: Biblioteka Nauki

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