Abstract This paper offered a synthetic co-hydrothermal carbonization (co-HTC) process to remove the sodium and chloride from high-alkali coal and polyvinyl chloride (PVC) to address the issue of contamination caused by high-alkali coal and chlorinated wastes. This work examined the effect of the mass ratio of PVC to coal (Rp/c) ranging from 0 to 0.20 (g/g) and the co-HTC temperature ranging from 225 to 300 °C on the dechlorination efficiency (DE), the sodium removal efficiency (RE), and the higher heating value (HHV) of hydrochar. Both of the temperature and Rp/c have noteworthy effect on the improvement of DE and RE in the co-HTC process. In this process, the temperature and Rp/c have significant effect on the morphology of hydrochar. Cracks on the surface of hydrochar became more visible with the increase of Rp/c, which could benefit to remove sodium ions from coal matrix. The co-HTC process was conducive to the improvement of HHV. The co-HTC process is cost-effective because sodium and chloride were removed from raw materials simultaneously without chemical additives. Thus, this work presents an innovative insight into the technological development of waste-to-energy and high-alkali-coal cleaner production.

中文翻译：

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高碱煤与聚氯乙烯共水热碳化过程中钠和氯的去向

摘要 本文提出了一种合成共水热碳化（co-HTC）工艺，以去除高碱煤和聚氯乙烯（PVC）中的钠和氯，以解决高碱煤和氯化废物造成的污染问题。这项工作检查了 PVC 与煤的质量比 (Rp/c) 范围从 0 到 0.20 (g/g) 和 co-HTC 温度范围从 225 到 300 °C 对脱氯效率 (DE)、钠去除效率 (RE)，以及氢炭的较高热值 (HHV)。温度和 Rp/c 对 co-HTC 过程中 DE 和 RE 的改善都有显着影响。在此过程中，温度和 Rp/c 对水焦的形貌有显着影响。随着 Rp/c 的增加，水炭表面的裂纹变得更加明显，这有利于从煤基质中去除钠离子。co-HTC工艺有利于HHV的改进。co-HTC 工艺具有成本效益，因为钠和氯化物同时从原材料中去除，无需化学添加剂。因此，这项工作对垃圾发电和高碱煤清洁生产的技术发展提出了创新见解。