Conical spouted bed combustor to obtain clean energy from avocado waste

The advantages of spouted bed technology for waste treatment are linked to the high excess of renewable biomass waste generated by the large worldwide consumption of avocado. Therefore, the applicability of avocado waste as fuel in a novel conical spouted bed combustor was investigated. The solid cyclic movement in this reactor innovatively promotes better mass and heat transfer, as well as better energy exploitation of the waste. Local heat transfer coefficients were experimentally determined in the beds of avocado waste in the combustor to assess their heat transfer and determine their value as biofuels. The combustion of the avocado beds in the spouted bed regime was performed at 300–600 °C in a conical reactor at the minimum spouting velocity. The exhaust gas evolution was monitored over time, and the emission ratios were calculated. The combustion efficiencies of avocado seeds, skin, and their binary mixtures, determined from flue gas concentrations, were compared, and the effects of temperature and bed composition on combustion efficiency were analyzed. [Display omitted] •Renewable biomass, avocado waste was used as biogenic fuel: seeds, skin and mixtures.•The use of avocado waste as fuel was assessed in a conical spouted bed combustor.•Previous drying of avocado waste reduces weight and speeds up combustion.•Conical spouted bed combustor is highly efficient for avocado waste combustion.•Emissions ratios of pollutants gases obtained were low.