Pyrolysis of high ash sewage sludge: Kinetics and thermodynamic analysis using Coats-Redfern method

RENEWABLE ENERGY

卷:131

Article

Naqvi, Salman Raza^1,2  Tariq, Rumaisa²  Hameed, Zeeshan²  Ali, Imtiaz³  Naqvi, Muhammad⁴  Chen, Wei-Hsin⁵  Ceylan, Selim⁶  Rashid, Harith⁷  Ahmad, Junaid⁸  Taqvi, Syed A.^9,11  Shahbaz, Muhammad¹⁰ 

[1] Univ Twente, Fac Engn Technol, Thermal Engn Grp, NL-7500 AE Enschede, Netherlands

[2] Natl Univ Sci & Technol, Sch Chem & Mat Engn, H-12, Islamabad, Pakistan

[3] King Abdulaziz Univ, Dept Chem & Mat Engn, Rabigh, Saudi Arabia

[4] Karlstad Univ, Dept Engn & Chem Sci, Karlstad, Sweden

[5] Natl Cheng Kung Univ, Dept Aeronaut & Astronaut, Tainan, Taiwan

[6] Ondokuz Maw Univ, Dept Chem Engn, TR-55139 Samsun, Turkey

[7] Eindhoven Univ Technol, Dept Chem Engn & Chem, Eindhoven, Netherlands

[8] Free Univ Bolzano, Fac Sci & Technol, Piazza Univ 5, I-39100 Bolzano, Italy

[9] NED Univ Engn & Technol, Dept Chem Engn, Karachi 75270, Pakistan

[10] Univ Gujrat, Dept Chem Engn, Gujrat, Pakistan

[11] Univ Teknol PETRONAS, Dept Chem Engn, Seri Iskandar, Malaysia

关键词: Sewage sludge;    Pyrolysis;    Kinetics;    Thermodynamic parameters;    Thermogravimetric analysis;   

DOI  :  10.1016/j.renene.2018.07.094

来源: Elsevier

【 摘 要 】

This study aims to investigate the thermo-kinetics of high-ash sewage sludge using thermogravimetric analysis. Sewage sludge was dried, pulverized and heated non-isothermally from 25 to 800 degrees C at different heating rates (5, 10 and 20 C/min) in N-2 atmosphere. TG and DTG results indicate that the sewage sludge pyrolysis may be divided into three stages. Coats-Redfern integral method was applied in the 2nd and 3rd stage to estimate the activation energy and pre-exponential factor from mass loss data using five major reaction mechanisms. The low-temperature stable components (LTSC) of the sewage sludge degraded in the temperature regime of 250-450 degrees C while high-temperature stable components (HTSC) decomposed in the temperature range of 450-700 degrees C. According to the results, first-order reaction model (F1) showed higher Ea with better R-2 for all heating rates. D3, N1, and S1 produced higher Ea at higher heating rates for LTSC pyrolysis and lower Ea with the increase of heating rates for HTSC pyrolysis. All models showed positive Delta H except F1.5. Among all models, Diffusion (D1, D2, D3) and phase interfacial models (S1, S2) showed higher Delta G as compared to reaction, nucleation, and power-law models in section I and section II. (C) 2018 Elsevier Ltd. All rights reserved.

【 授权许可】

Free