Valorização energética de resíduos industriais por gasificação

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Publications

Co-gasification of glycerol/fat mixtures in a downflow fixed bed reactor: Preliminary results

Publication . Almeida, A.; Pilão, Rosa Maria; Ramalho, Elisa; Ribeiro, A.M.; Pinho, Carlos

The aim of this work was to assess the technical viability of glycerol/fat co-gasification. The gasification performance was studied in a downflow fixed bed reactor using steam as oxidizing agent. Tests were performed with a mixture of 10% of fat and 52% of water, and the effect of temperature was evaluated in the 800 ºC to 950 ºC range. Samples of dry gas from the gasifier were collected and analysed by gas chromatography in order to determine the CO, CO2, CH4 and H2 content. The results revealed that the co-gasification of glycerol/fat mixtures seems to be a feasible technical option. Best results of the gasification parameters were obtained at the highest tested temperature, 950 °C.

2019Conference object

Open access

Energy and exergy analysis of co-gasification of crude glycerol and animal fat mixtures

Publication . Almeida, Ana; Pilão, Rosa Maria; Ramalho, Elisa; Pinho, Carlos

This work presents an energy and exergy analysis of co-gasification tests of crude glycerol and animal fat mixtures, in order to obtain first and second law efficiencies, the last ones representing a novelty in the field of gasification technology. Mixtures with 5% (w/w) of dry animal fat, 57% (w/w) of dry treated crude glycerol and 38% (w/w) of water were studied in a fixed bed down flow gasification reactor at 800°C and 900°C. The increase of gasification temperature seems not to affect the energy and exergy yields of the overall process.

2022Journal article

Restricted access

Catalytic co-gasification of glycerol/fat mixtures: A preliminary study

Publication . Cruz, A. C.; Ramalho, M.E.; Pilão, Rosa Maria

In this work, the co-gasification of treated crude glycerol and animal fat was studied using steam as the gasifying agent. Tests were performed in a downflow fixed bed reactor with a bed composed of catalyst particles of dolomite. The gasification process was studied using a mixture with 59% of glycerol, 3% of fat and 38% of water and tests were carried out at 700 ºC and 750 ºC. The producer gas was quantified and analysed by gas chromatography obtaining, for the tested temperatures, between 48% and 47% of H2, about 13% of CO, 11% of CH4 and CO2 content between 30% and 27%. The results showed that the use of dolomite as a catalyst promotes the production of a gas rich in H2 and CO2. The results also show that the gasification parameters increase with temperature having obtained at the maximum working temperature a gas production yield of 0.92 m3/kg at 750ºC, a cold gas production efficiency of 70.6% and for the carbon and hydrogen conversion efficiencies the values obtained were 58.0 % and 40.9% respectively.

2021Conference object

Open access

Co-Gasification of Crude Glycerol/Animal Fat Mixtures

Publication . Almeida, Ana F.; Pilão, Rosa Maria; Ribeiro, Albina; Ramalho, Elisa; Pinho, Carlos

The aim of this work was to assess the technical viability of glycerol/fat co-gasification. The gasification performance was studied in a downflow fixed bed reactor using activated alumina particles as bed material and steam as oxidizing agent. The effect of gasification temperature, from 800 to 950 °C was studied with a feed mixture with 10% (w/w) of animal fat. The influence of fat incorporation on the feedstock in the overall gasification process was also performed, using 3% (w/w) and 5% (w/w) of fat in feed mixtures. Samples of dry gas from the gasifier were collected and analyzed by gas chromatography in order to determine the CO, CO2, CH4, and H2 content. The best results were obtained using the highest tested temperature, 950 °C, and using 3% (w/w) of animal fat in the feed mixture. The overall results revealed that the co-gasification of glycerol/animal fat mixtures seems to be a feasible technical option

2020Journal article

Open access