科研之友
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摘要
Experimental studies of moisture migration of typical municipal solid waste (MSW) matrices with high initial moisture content at so-called medium drying temperatures of 100 degrees, 120 degrees, 140 degrees, 160 degrees, 180 degrees, and 200 degrees C were carried out in a muffle furnace. The drying kinetics were studied based on experimental results of typical MSW matrices (i.e., quasi-isotropy biological waste matrices, strong anisotropy biological matrices, and weak-anisotropy a biological matrices). The values of effective moisture diffusivity Deff were obtained between 1.183x109 and 2.766x108m2/s within the medium temperature range. Temperature dependence of the effective moisture diffusivity was found to agree with the Arrhenius relationship, and the value of activation energy (Ea) was found to vary from 17.64 to 28.07kJ/mol. The results show that lower activation energies are required during the moisture migration of MSW matrix; activation energies of the biologic waste matrices are higher than those of a biological matrices, which can occur at lower drying temperature, and effective moisture diffusivity of the biologic waste matrices is higher than that of a biological matrices. Drying kinetics formulas of the matrices were determined, and consequently the effect of temperature on effective moisture diffusivity was acquired.
- 出版日期2013-5-1
- 单位北京交通大学
