Kinetic Analysis of Co-Pyrolysis of Sewage Sludge and Sawdust Based on Double Extrapolation Method
1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao 066004, China；
2. College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;
3. College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
Abstract：The thermogravimetric analysis experiment on sludge, sawdust and their mixture were carried out by thermogravimetric analyzer. Based on the double extrapolation method, the most probabilistic mechanism functions of the co-pyrolysis process of the mixture were obtained by combining several conventional solid pyrolysis mechanism functions. The results showed that there were two weight loss peaks in the DTG curve with mass ratio of sludge to sawdust 9:1. The main decomposition temperature range was 230-500 ℃ with a weight loss of about 47.1 %. The addiction of sawdust reduced the apparent activation energy (E) of the mixture and the peak appeared to shift to the high temperature. The E value of DTG peak varied slightly with the increase of heating rate, and there was a kinetic compensation effect between E and pre-exponential factor (A). The most probable mechanism functions of co-pyrolysis of the mixture before and after the DTG peak (230-350 and 350-500 ℃) were the Nucleation-Growth (n=4) and Chemical reaction (second order), respectively.
Yang Kai1,2,Ding Zhijiang3 et al. Kinetic Analysis of Co-Pyrolysis of Sewage Sludge and Sawdust Based on Double Extrapolation Method[J]. 化学反应工程与工艺, 2017, 33(4): 356-363.
