Effects of dehumidification drying parameters on physical and chemical properties of biomass brick

Abstract

Abstract In order to solve the environmental pollution caused by stalk burning, poplar wood and corn stalk fibers are molded into biomass brick with calcium hydroxide adhesive. Biomass brick is dried by dehumidification drying method which is energy-saving. Moisture content of brick is affected extremely significantly by drying temperature, relative humidity and time. Density and drying shrinkage rate of brick in length are affected extremely significantly by drying temperature and time. Compressive strength of brick is affected extremely significantly by relative humidity. There are 3643 cm−1 and 872 cm−1 for Ca(OH)2, 3400–3450 cm−1 and 1550–1660 cm−1 for OH and H O H, 2926 cm−1 for C H bond, 1425 cm−1 for lignin and 1030 cm−1 for C O bond in brick FTIR. The reaction extent between Ca(OH)2 and fiber, which is reflected by the weight loss segment between 100 °C and 200 °C in TG curve, is affected critically by the integration of air temperature, relative humidity and time. The endothermic process in DSC curve is affected by degradation extent of fiber. The essences of biomass brick with different properties are explained by the research results.