CO2 supply to a greenhouse from the combustion of vegetal waste

J.C. López, J.V. Reinoso, M.D. Fernández, F.G. Acién, J.A. Sánchez-Molina, M. David, C. Pérez, J.C. Gázquez
The use of biomass boilers to heat greenhouses is increasing due to the lower biomass cost compared to other fuels such as gasoil or gas. Furthermore biomass fuels are considered environmentally suitable to have a zero balance for CO2. Moreover, in addition to heat, biomass combustion produces CO2 that can be used to enhance the production of crops. The aim of this work was to develop a system for recovering CO2 from the flue gases of biomass combustion and its supply into the greenhouse. The CO2 capture was performed by adsorption on activated carbon that has the capability of selectively retaining the CO2 at high pressures and low temperatures. The investigation was carried out at Fundación Cajamar in Almería in a 'parral' greenhouse with an area of 887 m2. During the daytime hours, the CO2 greenhouse dose was 9 g CO2 h-1 m-2, and it was necessary to use the heating system for 4 h day-1 to capture the CO2 required. Both the biomass boiler and the CO2 capture system, resulted in a 2°C increase in air greenhouse night temperature and a mean CO2 concentration around 600 ppm during the daytime hours. This system can improve yield and reduce CO2 emissions to the atmosphere with the corresponding environmental benefit.
López, J.C., Reinoso, J.V., Fernández, M.D., Acién, F.G., Sánchez-Molina, J.A., David, M., Pérez, C. and Gázquez, J.C. 2017. CO2 supply to a greenhouse from the combustion of vegetal waste. Acta Hort. (ISHS) 1170:547-554
CO2 enrichment, climate, waste, crop, greenhouse, yield, CO2 capture, biomass combustion

Acta Horticulturae