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    Assessing thermal behaviors and kinetics of (co-)combustion of textile dyeing sludge and sugarcane bagasse
    (Pergamon-Elsevier Science Ltd, 2018) Xie, Wenhao; Huang, Jianli; Liu, Jingyong; Zhao, Yongjiu; Chang, Kenlin; Kuo, Jiahong; He, Yao; Büyükada, Musa; Evrendilek, Fatih
    Thermogravimetric and mass spectrometric (TG-MS) experiments were carried out using textile dyeing sludge (TDS), sugarcane bagasse (SB) and their blends with different ratios. (Co-)combustion kinetic parameters of each sample were calculate by using TG-derivative curves. CO2, NOx, NH3 and SO2 emissions were also quantified. The addition of SB to TDS lowered SO2 but enhanced NOx, NH3 and CO2 emissions. Calculated activation energies (E) of the pure TDS and SB, and their blend (TB64) according to the Flynn-Wall-Ozawa method were on average in the range of 185.6-253.9 kJ.mol(-1), 152.9-235.9 kJ.mol(-1) and 111.1-161.8 kJ.mol(-1), respectively. Based on the Kissinger-Akahira-Sunose method, E estimates of the pure TDS and SB, and the blend ranged from 183.1 to 251.0 kJ.mol(-1), 152.1 to 237.2 kJ.mol(-1) and 108.2 to 160.1 kJ.mol(-1), respectively. Our results indicated that the blend E was affected by the interactions between TDS and SB. (C) 2017 Elsevier Ltd. All rights reserved.
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    Comparative thermogravimetric analyses of co-combustion of textile dyeing sludge and sugarcane bagasse in carbon dioxide/oxygen and nitrogen/oxygen atmospheres: Thermal conversion characteristics, kinetics, and thermodynamics
    (Elsevier Sci Ltd, 2018) Xie, Wenhao; Wen, Shaoting; Liu, Jingyong; Xie, Wuming; Kuo, Jiahong; Lu, Xingwen; Sun, Shuiyu; Büyükada, Musa; Evrendilek, Fatih
    Thermodynamic and kinetic parameters of co-combustion of textile dyeing sludge (TDS) and sugarcane bagasse (SB) were studied using thermogravimetric analysis in CO2/O-2 and N-2/O-2 atmospheres. Our results showed that the comprehensive combustion characteristic index (CCI) of the blends was improved by 1.71-4.32 times. With the increased O-2 concentration, co-combustion peak temperature decreased from 329.7 to 318.2 degrees C, with an increase in its maximum weight loss rate from 10.04 to 14.99%/min and its CCI by 1.31 times (beta = 20 degrees C.min(-1)). To evaluate the co-combustion characteristics, thermodynamic and kinetic parameters (entropy, Gibbs free energy and enthalpy changes, and apparent activation energy) were obtained in the five atmospheres. The lowest apparent activation energy of the TB64 blend was obtained in oxy-fuel atmosphere (CO2/O-2 = 7/3).
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    Thermochemical behaviorsof textile dying sludge, paper mill sludge, and their blends during (co -)combustion
    (Elsevier Science Bv, 2017) Liu, Jingyong; Xie, Wenhao; Zhuo, Zhongxu; Büyükada, Musa; Evrendilek, Fatih
    This study aimed at the quantification of thermochemical behaviors of textile dye sludge (TDS), paper mill sludge (PMS), and their various blend ratios during (co -)combustion. Changes in Mass loss percentage (MLP) and rate (MLR) were estimated as a function of temperature, heating rate, and blend ratio. Our results pointed to a direct influence of blend ratios on mass loss percentage. Stochastic uncertainties and sensitivities associated with best -fit predictions of MLP and MLR responses were detected using all-at-once versus one-at-a-time Monte Carlo simulations. Co -combustion of TDS and PMS provided more flame stability owing to their volatile matter contents than did the combustion of pure TDS or PMS. The high C and H contents of TDS relative to those of PMS led to high lower heating value (higher energy). Effect of increased temperature on the co -combustion manifested itself in the breakdown of (hemi-)cellulose initially and lignin progressively in TDS and PMS. The increasing TDS of the blend ratio increased both MLP and MLR. Stochastic uncertainty analysis of the deterministic empirical models pinpointed overestimation by 15.6% in mean MLP and by 50% in mean MLR. Sensitivity analysis pointed to blend ratio as the most influential predictor on both MLP and MLR.