Exploring the pyrolysis process of simulated oily sludge: Kinetics, mechanism, product distribution, and S/N elements migration

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2024-11-06 DOI:10.1016/j.joei.2024.101882

Hui Wang , Jinling Li , Geyu Wu , Fang Miao , Bo Yang , Shidong Zhu , Tao Yu

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Abstract

Pyrolysis is an important method for energy recovery and harmless treatment of oily sludge, definite reaction mechanism and the transformation of S and N elements is a key to improve the pyrolysis products. In this paper, a simulated oil sludge (SOS) was pyrolyzed at various temperatures of 400–700 °C in a tube furnace focusing on pyrolysis process, kinetic parameters, reaction mechanisms, S and N element migration patterns and product distributions. Kinetic parameters were deducted by FWO, KAS, Friedman and Starink methods, and the activation energy were 186.23–231.20 kJ/mol (Avg. 210.71 kJ/mol), 190.18–233.80 kJ/mol (Avg. 212.02 kJ/mol), 196.93–242.01 kJ/mol (Avg. 209.88 kJ/mol) and 184.82–230.95 kJ/mol (Avg. 218.67 kJ/mol), respectively, showed high similarity. All the pre-exponential factors were higher than 10⁹ s⁻¹, which indicated high reactivity of SOS during pyrolysis, and the pyrolysis process followed the nucleation growth model (A3). Pyrolysis temperatures had a significant influence on products distribution. The maximum yields of pyrolysis tar and gas were observed at 550 °C and 700 °C, respectively. Pyrolysis tar was dominated by aromatics and acids, while pyrolysis gas was mainly composed of H₂ and CH₄. Additionally, high temperatures could facilitate the transfer of more S and N into tar or gas products, and S and N compounds were mainly thiophene-S, sulfoxide-S, pyridine-N and pyrrole-N in char and CS₂, CH₃SH, COS, SO₂, H₂S, NH₃, HCN and NO_x in gas.

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探索模拟含油污泥的热解过程：动力学、机理、产物分布和信噪比迁移

热解是能源回收和无害化处理含油污泥的重要方法，明确的反应机理和 S、N 元素的转化是改进热解产物的关键。本文在管式炉中对模拟油污泥（SOS）进行了400-700 ℃不同温度的热解，重点研究了热解过程、动力学参数、反应机理、S和N元素迁移规律及产物分布。通过 FWO、KAS、Friedman 和 Starink 方法推导出动力学参数，活化能分别为 186.23-231.20 kJ/mol（平均 210.71 kJ/mol）、190.18-233.80 kJ/mol（平均 210.71 kJ/mol）、190.18-233.80 kJ/mol（平均 210.71 kJ/mol）。80 kJ/mol（平均值为 212.02 kJ/mol）、196.93-242.01 kJ/mol（平均值为 209.88 kJ/mol）和 184.82-230.95 kJ/mol（平均值为 218.67 kJ/mol），显示出高度的相似性。所有前指数都高于 109 s-1，这表明 SOS 在热解过程中具有很高的反应活性，热解过程遵循成核生长模型（A3）。热解温度对产物分布有显著影响。热解焦油和气体的最大产率分别出现在 550 °C 和 700 °C 时。热解焦油主要是芳烃和酸，而热解气体主要由 H2 和 CH4 组成。此外，高温可促进更多的 S 和 N 转移到焦油或气体产物中，焦炭中的 S 和 N 化合物主要是噻吩-S、亚砜-S、吡啶-N 和吡咯-N，气体中的 S 和 N 化合物主要是 CS2、CH3SH、COS、SO2、H2S、NH3、HCN 和 NOx。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.