Wyniki wyszukiwania - BazTech

1

Fire and explosion characteristics of energy willow biomass during the superheated steam drying process

Siuta Dorota, Kukfisz Bożena, Adamski Robert, Mitkowski Piotr Tomasz

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

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2022

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Nr 82

21--36

EN

In this paper the explosive and fire properties of energy willow dust were experimentally determined before and after drying with superheated steam at temperatures of 120°C, 140°C, 160°C and 180°C. The conducted research has shown that operating parameters of the installation of drying with superheated steam of the energy willow biomass have a decisive impact on the fire-explosive characteristics of the dust produced. The results indicate that the higher the drying temperature, the stronger the probability of ignition of the willow dust cloud, the faster the flame propagation and the higher the explosion intensity. Although the superheated steam drying installation for energy willow biomass is considered to be safe, the probability of occurrence of a fire or explosion events of the biomass dust-air mixture is likely.

PL

W artykule wyznaczono eksperymentalnie właściwości wybuchowe i pożarowe pyłu wierzby energetycznej przed i po suszeniu parą przegrzaną w temperaturach 120°C, 140°C, 160°C i 180°C. Na podstawie przeprowadzonych badań stwierdzono, że parametry pracy instalacji suszenia parą przegrzaną biomasy wierzby energetycznej mają decydujący wpływ na charakterystykę pożarowo- -wybuchową powstającego pyłu. Wyniki wskazują, że im wyższa temperatura suszenia, tym większe prawdopodobieństwo zapłonu chmury pyłu wierzby, tym szybsze rozprzestrzenianie się płomienia i większa intensywność wybuchu. Pomimo, że instalacja suszenia parą przegrzaną biomasy wierzby energetycznej jest uważana za bezpieczną to prawdopodobieństwo wystąpienia zdarzeń pożarowych lub wybuchowych mieszaniny pyłowo-powietrznej biomasy jest prawdopodobne.

2

Dependence of the boiler flue gas losses on humidity of wood biomass

Dzurenda L., Banski A.

Archives of Thermodynamics

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2015

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Vol. 36, no. 4

77--86

EN

The paper analyzes the influence of humidity of combusted wood biomass on the flue gas losses. A mathematical relation between flue gas losses of the boiler on wood biomass humidity is presented as well as temperature of flue gas emitted from the boiler into the atmosphere. The limits of model application for the humidity of wood biomass falls into the interval 10–60% whereas the range of temperatures of flue gases emitted from the boiler to the atmosphere is 120–200°C. The influence of the humidity of wood biomass has an adverse effect on increasing the extent of the boiler flue gas losses and thus inefficiency of the heat production. The increase of the wood biomass humidity from the value of 10% to 60% with the outlet temperature of flue gases from the boiler 120°C causes an increase in flue gas loss of the boiler from the value 8.37% to 12.43%, similarly the increase of flue gas loss by 200°C from 15.19% to 22.55%, or the increase of the flue gas loss by 7.36%.

3

Woody biomass and annual production across a latitudinal gradient in Northern Scots pine (Pinus sylvestris) forests

Nagel L.

Polish Journal of Ecology

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2003

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Vol. 51, nr 4

471-479

EN

To better understand how forest growth might be affected by climate, we observed patterns of forest growth (in terms of basal area, diameter, canopy height, and total biomass) in Scots pine forest ecosystems at nine stands along a northern latitudinal gradient (50 stopni N - 70 stopni N) crossing Poland, Lithuania, Latvia, Estonia and Finland. This gradient is characterized by a northward decline in average annual temperature (delta = c.9 stopni C) and precipitation (delta = c. 300 mm). Basal area, average diameter, canopy height and total biomass appear correlated with average annual temperature (P-values range from <0.002 to 0.096), but were not correlated with average annual precipitation. None of the measures of absolute growth or percent growth rates (averaged over four measurement periods) were correlated with temperature or precipitation. A framework for evaluating recent increases in biomass pools in northern systems is given, but data here are of insufficient power to confirm or refute hypotheses of recent increase in production of northern forests.