College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Shanghai Tire Craftsman Technology Co., Ltd., Shanghai 201400, China.
Sci Total Environ. 2021 Jun 10;772:145507. doi: 10.1016/j.scitotenv.2021.145507. Epub 2021 Feb 1.
Environmental problems caused by waste tires have become so glaring that it has attracted wide attention. This case study seeks to examine the properties of carbon black from waste tires continuous commercial scale pyrolysis. This work aims to contribute to this growing area of research by exploring the difference between the properties of products under the condition of mass production and those under the condition of laboratory scale or pilot scale production. A pyrolysis prototype, with a waste tire mass flow rate of 50-60 t d was constructed and introduced. Steel-included tire granulates were pyrolyzed in micro-negative pressure furnace at about 420 ± 20 °C. This kind of nonstripping, micro-negative pressure and low-temperature continuous thermal pyrolysis technology can reduce the stripping process between rubber and steel wire, reduce the requirement of equipment sealing, and improve the utilization rate of resources. All three products including pyrolytic carbon black (CBp), tire pyrolysis oil (TPO) and pyrolysis gas showed good characteristics. Pyrolysis gas had been successfully re-used for pyrolysis furnaces and dryers. The higher heating value of TPO estimated to 37-40 MJ/ kg, which was comparable to diesel fuel through further treatment. Results of proximate analysis, element analysis, XPS, FTIR, XRD and surface structure confirmed that CBp with commercial scale production showed no apparent data difference with those in other small scale research cases. The morphological changes of carbon black particles were suggested, revealing a possible internal structure of CBp aggregates in commercial scale pyrolysis. This study is an attempt to push the existing research in this field to commercial production. This work generates fresh insight into the viability of continuous commercial pyrolysis and demonstrates the feasibility of the operation, providing reference for many researchers and units who study the pyrolysis technology of waste tires with the feasibility of industrial production.
废轮胎造成的环境问题已经变得十分突出，引起了广泛关注。本案例研究旨在考察商业规模连续热解废轮胎中炭黑的性能。这项工作旨在通过探索大规模生产条件下产品性能与实验室规模或中试规模生产条件下产品性能的差异，为这一日益增长的研究领域做出贡献。构建并引入了一种热解原型，其废轮胎质量流速为 50-60 t/d。在微负压炉中，在约 420±20°C 的温度下对含钢轮胎颗粒进行热解。这种无剥离、微负压和低温连续热解技术可以减少橡胶和钢丝之间的剥离过程，降低设备密封要求，提高资源利用率。热解碳黑（CBp）、轮胎热解油（TPO）和热解气这三种产品均表现出良好的特性。热解气已成功用于热解炉和干燥器。TPO 的高热值估计为 37-40 MJ/ kg，通过进一步处理可与柴油燃料相媲美。工业分析、元素分析、XPS、FTIR、XRD 和表面结构的结果表明，具有商业规模生产的 CBp 与其他小规模研究案例的数据差异不明显。研究还揭示了炭黑颗粒形态的变化，提出了在商业规模热解中 CBp 团聚体可能存在的内部结构。本研究旨在推动该领域的现有研究进入商业生产阶段。这项工作为连续商业热解的可行性提供了新的见解，并展示了操作的可行性，为许多研究废轮胎热解技术的研究人员和单位提供了参考，为工业生产的可行性提供了参考。
