title: Pyrolysis and oxy-fuel combustion characteristics and kinetics of petrochemical wastewater sludge using thermogravimetric analysis.
abstract: The pyrolysis and oxy-fuel combustion characteristics of petrochemical wastewater sludge (PS) were studied in air (O2/N2) and oxy-fuel (O2/CO2) atmospheres using non-isothermal thermogravimetric analysis (TGA). Pyrolysis experiments showed that the weight loss profiles were almost similar up to 1050K in both N2 and CO2 atmospheres, while further weight loss took place in CO2 atmosphere at higher temperatures due to char-CO2 gasification. Compared with 20%O2/80%N2, the drying and devolatilization stage of PS were delayed in 20%O2/80%CO2 due to the differences in properties of the diluting gases. In oxy-fuel combustion experiments, with O2 concentration increasing, characteristic temperatures decreased, while characteristic combustion rates and combustion performance indexes increased. Kinetic analysis of PS decomposition under various atmospheres was performed using Coats-Redfern approach. The results indicated that, with O2 concentration increasing, the activation energies of Step 1 almost kept constant, while the values of subsequent three steps increased.
authors.affiliation: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China.
authors.forename: Jianbiao
authors.initials: J
authors.lastname: Chen
authors.affiliation: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China; Key Laboratory of Industrial Ecology and Environmental Engineering of Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Mu
authors.affiliation: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China.
authors.forename: Jingcheng
authors.initials: J
authors.lastname: Cai
authors.affiliation: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China.
authors.forename: Pikai
authors.initials: P
authors.lastname: Yao
authors.affiliation: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China.
authors.forename: Xigeng
authors.initials: X
authors.lastname: Song
authors.affiliation: School of Energy and Power Engineering, Dalian University of Technology, Dalian 116023, Liaoning, China. Electronic address: hcyin@dlut.edu.cn.
authors.forename: Hongchao
authors.initials: H
authors.lastname: Yin
authors.affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering of Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning, China.
authors.forename: Aimin
authors.initials: A
authors.lastname: Li
mesh_terms: D001272:Atmosphere; D002245:Carbon Dioxide / Q000494:pharmacology; D005740:Gases / Q000737:chemistry; D006358:Hot Temperature; D007700:Kinetics; D010100:Oxygen / Q000494:pharmacology; D012722:Sewage / Q000737:chemistry*; D013818:Thermogravimetry / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D002245:Carbon Dioxide; D005740:Gases; D010100:Oxygen; D012722:Sewage; D062065:Wastewater
keywords: Kinetics; O(2) concentration; Oxy-fuel combustion; Pyrolysis; Sludge