Wyniki wyszukiwania - BazTech

1

Rock transport after an outburst and the fluidisation phenomenon – can it occur during a dolomite and gas outburst?

Kozieł Katarzyna, Skoczylas Norbert

Archives of Mining Sciences

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2023

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Vol. 68, no. 4

621--638

EN

Rock and gas outburst is a phenomenon in which fragmented rock material is transported deep into a pit. The transport of rock material by gas is a two-phase process. The article deals with the fluidisation of rock material. Considerations on the fluidisation phenomenon were carried out, and experiments were performed to help clarify whether the fluidisation of dolomite is possible. In the last chapter, a discussion was carried out, and the results obtained were analysed regarding the possibility of occurrence in mine conditions.

2

The hydrodynamics of a fluidised bed reactor

Rybak Anna, Jankowski Dawid

Technical Transactions

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2019

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Vol. 116, iss. 5

55--70

EN

This article presents results concerning the hydrodynamics of a reactor with a porous fluidised bed (group D according to Geldart). Pressure drops were experimentally determined by gas flow through the bed and empty column. Using equations from literature flow resistance on the bed and gas distributor, critical velocity and terminal velocity were calculated and the obtained results were compared with experimental data. The equation which best described the work of the tested fluidised bed was identified through a process of trial and error. The influence of sieve being operated on pressure drops occurring during the process was determined and its applicability in the other conditions was verified.

PL

W pracy zaprezentowano wyniki dotyczące hydrodynamiki reaktora z porolitową warstwą fluidalną (grupa D wg Geldarta). Eksperymentalnie wyznaczono spadki ciśnienia przy przepływie gazu przez złoże i pustą kolumnę. Korzystając z równań literaturowych, obliczono opory przepływu na złożu, dystrybutorze gazu, prędkość krytyczną i prędkość wywiewania oraz porównano otrzymane wyniki z danymi doświadczalnymi. Metodą prób i błędów znaleziono równanie najlepiej przedstawiające pracę badanego układu fluidalnego, określono wpływ eksploatowanego sita na spadki ciśnienia występujące w trakcie procesu oraz zweryfikowano jego stosowalność w innych warunkach.

3

The co-combustion of rubber waste with LPG fuel in a fluidised bed reactor

Migas P., Baron J.

Technical Transactions

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2018

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Vol. 115, iss. 8

73--85

EN

This paper presents experimental results relevant to the thermal utilisation of rubber wastes. The investigation employed a laboratory-scale bubbling fluidised bed combustor, (BFBC) running on liquefied petroleum gas with quartz sand as the inert bed material. When rubber samples (tyre fragments) were added, the reactor temperature and flue gas concentrations of CO, VOC, SO2, NOx and HCl were monitored. Tests were performed with bed temperatures of 800-1000°C and two different masses of the bed. It has been found that the emitted quantities of NOx and CO were dependent not only on the sample mass but also on the mass (depth) and temperature of the fluidised bed and dropped whilst the bed depth was increased and its temperature was raised.

PL

W artykule przedstawiono rezultaty eksperymentu termicznej utylizacji odpadów gumowo-kompozytowych w pęcherzowym złożu fluidalnym zasilanym paliwem gazowym LPG. Podczas procesu dokonywano pomiaru temperatury złoża oraz analizy składu spalin jak CO, VOC, SO2, NOx oraz HCl. Proces współspalania materiałów gumowych prowadzony był przy zmiennej masie (250 i 500g) i temperaturze złoża 800–1000°C. Bazując na bilansie masowym węgla, przeprowadzono obliczenia kinetyczne termicznej utylizacji próbki. Stwierdzono, że ilości emitowanych NOx oraz CO zależą nie tylko od masy próbki, ale również od masy i temperatury złoża fluidalnego, i zmniejszają się one wraz ze wzrostem wartości wspomnianych zmiennych.

4

Modelling of Cyclic Combustion of Coal

Gajewski W., Kijo-Kleczkowska A.

Archivum Combustionis

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2004

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Vol. 24 nr 1-2

101-117

EN

The cyclic combustion of coal results from the mevement of a granular material in a flow contour of the furnace with a circulating fluidised bed (CFB): combustion chamber, cyclone, loop system [1]. It can be stated, on the basis of observation of combustion in CFB, that the coal particles, after introducing into a loop system, break the combustion process due to the deficiency of oxygen. Continuation of the combustion takes place after re-input of the coal into the combustion chamber. In such a way the combustion of the coal particles becomes a cyclic process in CFB conditions. The above process relies on multiple heating, ignition, combustion and extinguishing. The results of theoretical and experimental investigations, related to the circular combustion of char particles, are presented in this paper. Elaborated mathematical model allows the wide analysis of combustion in CFB. It enables the prognosis of the combustion course during cyclic interruptions of process and repeated firing up of fuel particles at different intervals of time. It was stated that the cyclic character of the process leads to significant extension of real time combustion of the coal particle.