| Textile dyeing sludge is a solid product for waste-water treatment in textile printing and dyeing industry. At present, dyeing sludge has been used as arbitrarily pouring and misplacing, which will lead to serious harm to the environment. Therefore, search appropriate disposal methods are quite necessary for the industry. The incineration method are of great value to make the organic compounds, heavy metals, pathogens in textile dyeing sludge further reductive, stable and harmless, and make the organic compounds utilized as energy resources.Co-firing of textile dyeing sludge and coal is an effective measure to resource utilization of sludge incineration, which not only be a method for the treatment of textile dyeing sludge, but also make it utilized as energy resources. Co-firing can reach the sustainable development of textile dyeing sludge treatment. However, this study is only just carried it out at home.In this study, we carried out the study on the burning characteristics of the textile dyeing sludge treated by Fe-flocculation reduction through thermal gravimetric analysis. And the co-firing characteristics of textile dyeing sludge and coal have been investigated, the dynamics analysis was done at the maximum burning weightlessness stage, and the weightlessness rate equations were fitted out. The results provided a theoretical basis for calculation of the final weight loss with the reaction time. The best proportion of coal mix with textile dyeing sludge has been explored, which provides a theoretical basis for the factory burned of textile dyeing sludge. The conclusion made in this study as follow,(1) The maximum weight loss stage (escaping and combustion of volatile components) of drying time is 2 h for dyeing sludge incineration process, the activation energy of the reaction in prior to the peak of weight loss is 7.227 kJ/mol, and the reaction is half order-rate-reaction. The reaction of the peak after E= 87.040 kJ/mol, for the second-order-rate reaction. Those results verified by the linear regression equation, correlation coefficients (R) are 0.9936 and 0.9910, respectively. Comparing to activation energy before and after the peak when dyeing sludge incineration, the small molecules in the sludge are easier to escape and burn, while the activation energy is higher when macromolecules burned. Before and after the peak, weight loss rate equation showed as following, the equation ahead of the peak is y=9.00318-0.09968x, correlation coefficient R2 is 0.9981; and after the peak is y=5.576+2.105/(l+exp ((x-18.076)/1.349)), and R2 is 0.9978, respectively. The results provided a theoretical basis for calculation of the final weight loss on the reaction time.(2) According to the calorific value of a mixed sample and the case of coke of incineration slag, the results were obtained. Mixed coal quality percent of 33%, and calorific value is 20.662 kJ/kg, which is the optimized mixed proportion. In the third stage (493.8-700℃) of the incineration of the mixed proportion of 33%, before and after the peak, the reaction pattern is second-order-rate reaction, the activation energy E=268.542 kJ/mol. And the weight loss equation is y= 4.540+2.460/(l+exp((x-7.898)/2.021)), the correlation coefficient is 0.9998. This equation can express the weight loss rate in this stage of the incineration process perfectly.It provides the theoretical basis for industrial applications in incineration of textile dyeing sludge and coal in the research. |
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