Wyniki wyszukiwania - Biblioteka Nauki

1

Influence of the environment on the operational safety of a fluidized bed boiler

100%

Dudek A. , Kobyłecki R.

System Safety : Human - Technical Facility - Environment

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2019

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tom Vol. 1, nr 1

678--683

EN

The use of fluidized bed boilers in modern power engineering is a promising solution for clean and economically acceptable combustion of various fuels, including coal, biomass and waste, for the generation of electricity. The fluidized bed boilers are nowadays technically advanced and complex combustion facilities where all individual boiler elements are subjected to withstand continuous structural and thermal loads during their operation. Intensive loading of boiler elements can be quite easily linked with boiler operational safety and is quite often one of the main reasons for emergency shutdowns followed by necessary replacements of the damaged items. In case of industrial large-scale circulating fluidized bed boilers the frequency of unplanned shutdowns is also quite often affected by the hydrodynamics of the fluidized bed and some other parameters, such as the intensity of solids circulation, temperature, solids concentration, flue gas composition and velocity, solids accumulation and deposition, as well as the corrosion or erosion of heat transfer surfaces. The present paper briefly reports the results of authors investigation focused on the morphology and structure of some chosen elements (steel anchors) sampled from one of Polish circulating fluidized bed boilers. The anchors were degraded during boiler operation and lost their mechanical durability. In order to determine the reasons of anchors’ degradation chemical composition of the elements was determined with the use of a spark spectrometer SPECTROLAB and sample morphology was investigated with JEOL JSM-6610LV scanning microscope equipped with LaB6 cathode.

2

Modelowanie termicznego przetwarzania paliw w przepływie zawirowanym

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Zarzycki R. , Kobyłecki R.

Przemysł Chemiczny

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2020

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tom T. 99, nr 4

620--623

PL

Przedstawiono konstrukcję paleniska cyklonowego pozwalającego na prowadzenie procesów spalania i zgazowania paliw stałych w silnie zawirowanym przepływie. Przeprowadzone obliczenia numeryczne procesu spalania i zgazowania pyłu węglowego wykazały, że możliwe jest uzyskanie na wylocie z paleniska cyklonowego stężenia CO wynoszącego 78,6%. Sposób prowadzenia procesu zgazowania paliwa pozwala na kontrolę temperatury wewnątrz paleniska cyklonowego.

EN

Anal. of the combustion and gasification of coal dust in the designed cyclone furnace was carried out on the basis of numerical calcn. The temp. control in the furnace chamber was adjusted by means of an endothermic Boudouard reaction (gasification of a carbonizate). The design of the lower part of the furnace and the arrangement of the gas supply nozzles allowed to control the residence time of the fuel grains in the furnace. Coal gasification products showed CO concn. of about 78.6%.

3

Modelowanie numeryczne – przydatne narzędzie inżynierskie dla poprawy eksploatacji urządzeń energetycznych

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Kobyłecki R. , Zarzycki R.

Energetyka

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2022

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tom nr 3

135--137

PL

W artykule przedstawiono kilka wybranych aspektów zastosowania modelowania numerycznego w realizacji prac naukowo-badawczych. Zaproponowane podejście i metodyka postępowania mogą być zastosowane w obliczeniach i ocenie warunków pracy rzeczywistych elementów, układów, bądź urządzeń energetycznych, a wyniki obliczeń posłużyć mogą zwłaszcza dla ułatwienia analizy bieżącej pracy, jak i optymalizacji wydajności oraz wydłużenia trwałości i czasu eksploatacji analizowanych urządzeń.

EN

Some chosen aspects associated with the application of numerical modeling for the investigation of numerous scientific and research works are presented in the current paper. The proposed approach and methodology may be used for the calculations and assessment of the operating conditions of real power generating systems or devices. The modelling results can be used especially to diagnose and facilitate the analysis of the operating conditions of the analyzed devices, as well as to optimize the efficiency and extend the durability and operation time of power generating facilities.

4

The effect of porosity on the reactivity of calcium sorbents

100%

Wichliński M. , Kobyłecki R.

Mineralogia

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2020

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tom Vol. 51, iss. 1

37--45

EN

The current work presents the results of seven sorbent samples investigated with respect to SO2 capture. The sorbents’ reactivity and capacity indexes were determined, and the tests were carried out in accordance with the ‘classical’ procedure for limestone sorbents. The reactivity indexes (RIs) of the tested samples were in the range of 2.57 and 3.55 (mol Ca)/(mol S), while the absolute sorption coefficients as determined by the capacity index (CI) varied between 87.9 and 120.6 (g S)/(kg of sorbent). Porosimetric analysis was also carried out and the specific surface area of the samples was found to be between 0.2 and 1.7 m2 /g. The number of micro-, meso- and macro-pores in individual samples was determined from the corresponding pore size distribution histograms, and the values of sorbent RIs and CIs were correlated with the samples’ total porosity and specific surface.