Effect of low-temperature oxidation on the bonding and combustion characteristics of asphalt rock

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-02-01 DOI:10.1016/j.joei.2024.101926

Jiatao Xiang , Xiong Zhang , Han Zhang , Anmin Dong , Shaohui Ren , Shihong Zhang , Jing'ai Shao , Xianhua Wang , Haiping Yang , Hanping Chen

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引用次数: 0

Abstract

Asphalt rock, characterized by high viscosity and low grade, poses challenges in fuel feeding and is prone to ash deposition and slagging in boilers. Low-temperature oxidation (LTO) is a promising method for modifying and upgrading inferior fuels. In this study, orthogonal experiments were conducted to determine the optimal LTO conditions and assess its effects on the bonding and combustion characteristics of asphalt rock. The results indicate that the optimal LTO conditions are an oxidation temperature of 240 °C, oxidation time of 20 min, and particle size of 1.0–1.4 mm. Under these conditions, the initial bonding temperature (IBT) of asphalt rock increases to 255 °C, a 35 °C improvement over the untreated sample (220 °C) of the control group (CG), while the weight loss ratio (WLR) is 2.52 %. The oxidation temperature has the most significant impact on both IBT and WLR. When subjected to LTO at 240 °C, the asphalt rock exhibits improved combustion characteristics, with better values for DTG_max, DTG_mean, ignition temperature (T_i), peak temperature (T_p), ignition index (D_i), and comprehensive combustion index (CCI), compared to the CG. However, the burnout temperature (T_b) and burnout index (D_b) are slightly lower than those of CG. Furthermore, both the activation energy (E_a) and frequency factor (A) of asphalt rock increase after LTO, suggesting a significant enhancement in its combustion characteristics. Therefore, LTO proves to be an effective and promising method for improving the bonding and combustion characteristics of asphalt rock.

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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.