The pyrolysis and gasification of digestate from agricultural biogas plant

• Autorzy: Wiśniewski D. , Gołaszewski J. , Białowiec A.

Identyfikatory

DOI

10.1515/aep-2015-0032

Warianty tytułu

PL

Piroliza i gazyfikacja pofermentu z biogazowni rolniczych

• Języki publikacji: EN

Abstrakty

EN

Anaerobic digestion residue represents a nutrient rich resource which, if applied back on land, can reduce the use of mineral fertilizers and improve soil fertility. However, dewatering and further thermal processing of digestate may be recommended in certain situations. Limited applicability of digestate as fertilizer may appear, especially in winter, during the vegetation period or in areas where advanced eutrophication of arable land and water bodies is developing. The use of digestate may be also governed by different laws depending on whether it is treated as fertilizer, sewage sludge or waste. The aim of this paper is to present the effects of thermal treatment of solid fraction of digestate by drying followed by pyrolysis and gasification. Pyrolysis was carried out at the temperature of about 500°C. During this process the composition of flammable gases was checked and their calorific value was assessed. Then, a comparative analysis of energy parameters of the digestate and the carbonizate was performed. Gasification of digestate was carried out at the temperature of about 850°C with use of CO₂ as the gasification agent. Gasification produced gas with higher calorific value than pyrolysis, but carbonizate from pyrolysis had good properties to be used as a solid fuel.

PL

Pozostałości z biogazowni rolniczych stanowią bogaty w substancje nawozowe surowiec, w przypadku którego, jego rolnicze wykorzystanie, może zmniejszyć stosowanie nawozów mineralnych i poprawić właściwości gleby. Jednakże poferment powinien być wcześniej odwodniony i przetworzony termicznie. Ograniczona stosowalność w środowisku przyrodniczym pofermentu może szczególnie wystąpić w okresie zimowym oraz na terenach zagrożonych eutrofizacją. Wykorzystanie pofermentu podlega także ograniczeniom prawnym w zależności od tego czy jest traktowany jako nawóz, osad lub odpad. Celem artykułu jest przedstawienie efektów zastosowania termicznego przetwarzania odwodnionego pofermentu w procesach pirolizy i zgazowania. Proces pirolizy pofermentu prowadzono w temperaturze 500°C. Monitorowano skład i kaloryczność gazu pirolitycznego. Wykonano porównawcze analizy kaloryczności odwodnionego pofermentu i uzyskanego w wyniku pirolizy karbonizatu. Gazyfikację prowadzono w temperaturze 850°C w atmosferze CO₂. Wykazano, iż uzyskany w procesie gazyfikacji gaz syntezowy posiadał wyższą kaloryczność, jednak dodatkowy produkt procesu pirolizy karbonizat posiadał dobre właściwości do wykorzystania jako paliwo stałe.

Słowa kluczowe

EN

anaerobic digestion; digestate; fertilizer; drying; pyrolysis; gasification

PL

fermentacja beztlenowa; poferment; odwodnienie pofermenetu; biogazownia; nawóz; piroliza; gazyfikacja

• Wydawca: Institute of Environmental Engineering, Polish Academy of Sciences
• Czasopismo: Archives of Environmental Protection
• Rocznik: 2015
• Tom: Vol. 41, no. 3
• Strony: 70--75
• Opis fizyczny: Bibliogr. 23 poz., rys., tab.

Twórcy

autor

Wiśniewski D.

• University of Warmia and Mazury, Poland Research Center for Renewable Energy

autor

Gołaszewski J.

• University of Warmia and Mazury, Poland Research Center for Renewable Energy

autor

Białowiec A.

• University of Environmental and Life Sciences Faculty of Life Sciences and Technology Institute of Agricultural Engineering

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