Comparative study of temperature-programmed pyrolysis and two-step fast pyrolysis of oily sludge

被引：0
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作者：
Lin, Riyi [1 ]
Wang, Lijuan [1 ]
Zhang, Jianliang [1 ]
Li, Xuanyu [2 ]
Zheng, Weibo [1 ,3 ]
Zhang, Liqiang [1 ]
机构：
[1] College of New Energy, Qingdao Engineering Research Center of Efficient and Clean Utilization of Fossil Energy, China University of Petroleum (East China), Qingdao,266580, China
[2] Liaohe Therma Mining Machinery Manufacturing Branch of CNPC Bohai Petroleum Equipment Manufacturing Company Limited, Panjin,124209, China
[3] Shengli Oilfield Technical Inspection Center, SlNOPEC, Dongying,257000, China
来源：
Journal of Analytical and Applied Pyrolysis | 2023年 / 173卷
关键词：
Oily sludge (OS) is the main waste produced in the process of crude oil extraction; transportation; and refining. As a promising technology of OS treatment; pyrolysis can reduce pollutant emissions and fully recover resources. In this study; the pyrolysis characteristics and product quality of temperature-programmed pyrolysis (TPP) and two-step fast pyrolysis (TSFP) were investigated. For the TG analysis; the faster heating rate could promote the pyrolysis of OS and increase its weight loss rate. In TPP; the higher final pyrolysis temperature provided more energy; which made the C[sbnd]H bond and C[sbnd]C bond break; increased the gas yield and oil yield; and also increased the hydrogen component in the gas; but reduced the char yield. However; the lower final pyrolysis temperature could improve the calorific value of oil. In TSFP; the oil yield was mainly affected by the first step pyrolysis temperature (T1); and the oil yield was 30.9 % at T1 of 500 ℃. The gas yield was both affected by T1 and the second step pyrolysis temperature (T2); and the gas yield could reach a maximum of 32.5 % at 550 ℃ (T1) × 800 ℃ (T2); which was 46.9 % higher than that of TPP (700 ℃; 22.1 %). This was due to the fact that as the T2 rose; the macromolecular components broke down; promoting the generation of gas. In TSFP; the hydrogen component in the gas was the most at 500 ℃ (T1) × 800 ℃ (T2). Compared with TPP; the total calorific value of the available products (oil and hydrogen) could be increased by TSFP; which increased the energy utilization efficiency. This study is expected to provide a theoretical basis for the industrial application of TSFP. © 2023 Elsevier B.V;
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