Community Research and Development Information Service - CORDIS

Use of agricultural waste instead of petroleum in a lime kiln

Research was carried out on the use of agricultural wastes to feed a lime kiln, using new technologies in order to save energy, reduce ground and underground pollution from agricultural wastes and recycle exhaust gases in order to improve working parameters and expand the lifespan of the installation. The project consists of a biomass storage, from where a feeding silo is filled by a spade. Through a conveyor screw the biomass goes to a grinding machine. A blower conveys the biomass to four dosimetrical feeding systems. Each of them has a primary air blower. Hot gases go into the vertical lime kiln. Exhaust gases are filtered and partially recycled to the biomass conveying duct.

The project has been successfully completed. The factory is now running on 100% agricultural waste as combustion fuel. The combustion yield is near to the theoretical value and no emission of dust and noxious gases is made to the atmosphere. The implementation of innovative technologies such a closed type burners, pneumatical transport and a sophisticated control system have contributed to reaching the following goals:
no pollutant emissions;
improvement of the working environment;
increase in the quality of the product by eliminating the dust produced in the biomass combustion;
energy substitution of 2000 t of energy /y (5400 t/y biomass);
only 1 kg biomass per 3.7 kg calcium oxide produced;
economic success with a 2.2 year pay-back;
reduction of production cost by 50%.

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