Wyniki wyszukiwania - BazTech

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Wpływ rodzaju drewna na czas zadziałania autonomicznych czujek dymu

Osiński Adrian, Boroń Sylwia

Materiały Budowlane

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2020

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nr 10

54--57

PL

W artykule omówiono badania doświadczalne wpływu rodzaju drewna na czas zadziałania wybranych autonomicznych czujek dymu. Polegały one na pomiarze czasu zadziałania autonomicznych czujek dymu podczas spalania płomieniowego i bezpłomieniowego próbek wybranych gatunków drewna oraz materiałów drewnopodobnych powszechnie stosowanych w budownictwie mieszkaniowym i przemyśle meblarskim. Na podstawie uzyskanych wyników dokonano oceny przydatności i niezawodności działania autonomicznych czujek dymu podczas detekcji pożaru w zależności od rodzaju spalania oraz zastosowanego materiału palnego.

EN

The article examines the influence of the type of wood on the response time of selected autonomous smoke detectors. The conducted experimental studies consisted in measuring the response time of autonomous smoke detectors during flame and flameless combustion of samples of selected wood species and wood-based materials commonly used in housing and furniture industry. On the basis of the obtained results, the usability and reliability of operation of autonomous smoke detectors during fire detection was assessed, depending on the type of combustion and the use of flammable material.

2

Wykorzystanie trwałych izotopów tlenu (16O2 i 18O2) i węgla (12C i 13C) do badania katalitycznego procesu całkowitego utleniania metanu

Rotko M., Machocki A., Stasińska B.

Przemysł Chemiczny

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2009

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T. 88, nr 7

815-818

3

Why does the activity of Pd/Al2O3 catalysts in the reaction of methane oxidation depend on the dispersion of palladium phase?

Machocki A., Stasińska B., Gac W.

Polish Journal of Chemical Technology

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2006

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Vol. 8, nr 2

93-96

EN

The characterization of Pd/Al2O3 catalysts with varied dispersio of palladium phase, prepared with a chlorine-free precursor, with similar palladium loading and on the same support has been performed in order to identify the factors responsible for the variation of their activity in the oxidation of methane. The higher dispersion of the palladium phase decreases the temperatures necessary to achieve desired methane conversions. The rate (turnover number) of the reaction is higher on small crystallites up to 350°C, at higher temperatures the opposite relation is observed. Such dependences can result from the changes in the number of Pd-PdO active sites, and the different activity of the single active site may be attributed to the interaction between palladium phase crystallites and Al2O3 support. This interaction causes different redox properties of the small and large palladium phase crystallites, i.e.: (i) easier oxidation of palladium and stronger bonding of oxygen in small palladium oxide crystallites, (ii) easier donation of lattice oxide ions from the support to small palladium phase crystallites and (iii) their stabilization in a more oxidized state.

4

Flameless oxidation at the GT26 gas turbine: numerical study via full chemistry

Ochrymiuk T., Badur J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

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2001

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Vol. 5, No 2

239-246

EN

Sequential combustion was first applied to gas turbines more than 40 years ago, and almost half of these early machines are still operating. This form of oxidation leads to the flame-less combustion at a second chamber. In GT26, the second stage combustor has 24 SEV burners which are similar in action to the well known ABB EV burner. In this paper, a 3D numerical simulation of the first EV combustor and the second SEV-combustor are performed for normal operating conditions (exhaust mass flow 542 kg/s, exhaust temperature 610 C). Physical modelling of the flame-less oxidation is based on an original implementation of the Gri-Mech mechanism (325 chemical reactions) into the Fluent 5.4. Precise estimation of NOx emission and other pollutants has been done.