Preventing circulating fluidised bed agglomeration and deposition during biomass combustion

• Autorzy: Nowak W. , Kruk W. , Dunajski Ł.
• Języki publikacji: EN

Abstrakty

EN

According to a fuel flexibility, fluidized bed boilers are considered as appropriate for biomass combustion as cofiring. But the burning of fuels such as forest and agricultural biomass raises a number of operational problems. Most important of these problems are bed agglomeration and deposition. Deposition appears when biomass contains significant amounts of alkali elements, such as sodium and potassium. The purpose of the work is to select a fuel additive to overcome these operational problems. Investigations were conducted in two stages at a pilot scale 0.1 MW_th laboratory circulating fluidized bed reactor. As the fuel, the mixture of biomass contained forest residues, sunflower husks, straw and wood pellets from mixed woods was selected. In the first stage biomass was burnt without any additives, while in the second one the fuel was enriched with some additive. The additive (liquid mixture of chemicals) was added to the fuel in amounts of 1 dm³ per 5–10 Mg of fuel. The following operational parameters were examined: temperature profiles along the height of the circulating fluidized bed column, pressure profiles, emissions. After the tests, the laboratory reactor was inspected inside. Its results enables expression of the following conclusions: there was no agglomeration during fuel additive testing, and the deposition was reduced as well. Moreover, the parts (heating surfaces, separator) of the laboratory reactor were coated with a protective layer. The layer covered microcracks and protected the parts from deposition for a long period after the operation.

Słowa kluczowe

EN

biomass combustion

PL

spalanie biomasy

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2013
• Tom: Vol. 34, no. 1
• Strony: 3--18
• Opis fizyczny: Bibliogr. 6 poz., il.

Twórcy

autor

Nowak W.

• Department of Heating, Ventilation and Air Protection, Faculty of Environmental Engineering and Biotechnology, Częschochowa University of Technology, J.H. Dąbrowskiego 73, 42-200 Częstochowa, Poland

autor

Kruk W.

• Department of Heating, Ventilation and Air Protection, Faculty of Environmental Engineering and Biotechnology, Częschochowa University of Technology, J.H. Dąbrowskiego 73, 42-200 Częstochowa, Poland

autor

Dunajski Ł.

• Department of Heating, Ventilation and Air Protection, Faculty of Environmental Engineering and Biotechnology, Częschochowa University of Technology, J.H. Dąbrowskiego 73, 42-200 Częstochowa, Poland

Bibliografia

• 1. Bartels M.,Lin W., Nijenhuis J., Kapteijn F., Ommen J.R.:Agglomeration in fluidized beds at high temperatures: Mechanisms, detection and prevention.
• 2. Wisz J.,Matwiejew A.: Biomass – for energetic burnt. Energopomiar Sp. z o.o.
• 3. Kubica K.: Biomass energetic usage – technical – technological conditions. ITC Politechnika Śląska, Polski Klub Ekologiczny Okręg Górnośląski.
• 4. Garcia-Galindo D., Sebastian F.: Current Spanish biomass co-firing potential in coal power stations.
• 5. Lorenz U., Grudzinski Z.: Companion burning of coal and biomass in energetics - prices and costs on the basic on lignite. Instytut Gospodarki Surowcami Mineralnymi i Energią PAN, Krakow.
• 6. Kubica K.: Biomass burning and companion burning with coal – techniques, benefits and barriers. Instytut Chemicznej Przeróbki Węgla Zabrze.