Abstract
In this paper, a novel scheme of a solar-biomass integrated Fluidized Bed Drying (FBD) system has been proposed for drying of agricultural food-grains. During the hours of sunshine, ambient air passes through a solar air-heater and gets heated to the required drying temperature. When solar heating becomes inadequate or unavailable such as during cloudy days or at night, a biomass furnace assisted backup heat exchanger is used for heating the incoming air. This ensures continuous operation of the drying system all through the day and night (24h). Surplus heat from the biomass furnace after meeting the in-house requirements is utilized in an Organic Rankine Cycle (ORC) to generate electricity. A thermal model has been developed for the proposed system for drying of paddy grains. The performance of the system has been analyzed for representative days of January, May and September for the city Kolkata (22°34’N 88°22’E), located in the plains of India. The study reinforces the viability of development of a solar-biomass powered FBD for drying of grains of paddy in rural areas of the country and at the same time has potential for power generation that can meet the utility requirements of rural population.
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