Comparison of thermal behavior for modified calcium magnesium acetate blended separately with peanut shell and sewage sludge at different atmospheres

摘要

Experiments were conducted in a thermogravimetric analyzer to evaluate and compare the thermal behavior for modified calcium magnesium acetate (MCMA) blended separately with peanut shell (PS) and sewage sludge (SS) at different atmospheres. Characteristic temperatures and indices of blended fuels of samples were also investigated. Results indicated that devolatilization indices of blended fuels decrease compared with separate samples because of higher decomposition temperature of MCMA. Comprehensive combustibility index of PS/MCMA-O30 increases at higher mole ratio of calcium to sulfur (Ca/S ratio), while its value of SS/MCMA-O30 increases first as Ca/S ratio increases from 0 to 2, and decreases little at Ca/S ratio of 3. Significant mass loss of blended fuels occurs in the second combustion stage. Combustion performances of PS and SS are enhanced after MCMA addition at higher oxygen ratio due to improved fixed carbon combustion. Characteristic temperatures decrease, while characteristic indices increase with oxygen ratio under O-2/CO2 atmosphere.