Hydrothermal carbonization (HTC) is a promising and effective technology for upgrading the fuel quality of high-moisture organic wastes. However, a large amount of energy is required to heat the feedstock to high temperature for HTC. Therefore, the maximum waste heat should be recovered to increase the energy efficiency of the HTC process. In this work, a flash-organic Rankine cycle (FSPG-ORC) system was coupled after HTC to recover the heat contained in the HTC slurry product. Various operating factors including the flashing temperature, the HTC temperature, the solid-water ratio (S/W) of the feedstock, and the organic working fluids in the ORC section were studied to obtain their influences on thermodynamic performance of the coupled system. Results indicated that the net power (W_net) of the FSPG-ORC system increased from 185.64 to 774.30 kW through the increase of the HTC temperature from 160 to 280°C. In addition, the W_net and exergy efficiency of the FSPG-ORC system also increased with increasing the flashing temperature of HTC slurry product. The coupled FSPG-ORC system converted waste heat to electric energy and increased the energy efficiency of the HTC process.

中文翻译：

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闪蒸和有机朗肯循环耦合过程从水热碳化浆液产品中回收热量：热力学分析

水热碳化（HTC）是一种有前景的有效技术，可用于提高高水分有机废物的燃料质量。然而，为了将原料加热到高温，HTC 需要大量的能量。因此，应最大限度地回收余热，以提高 HTC 工艺的能源效率。在这项工作中，在 HTC 之后耦合了闪蒸有机朗肯循环 (FSPG-ORC) 系统，以回收 HTC 浆料产品中包含的热量。研究了闪蒸温度、HTC温度、原料固水比(S/W)和ORC段有机工质等各种操作因素对耦合系统热力学性能的影响。结果表明，净功率（W _net) 通过将 HTC 温度从 160 增加到 280°C，FSPG-ORC 系统的功率从 185.64 增加到 774.30 kW。此外，FSPG-ORC 系统的W_净值和火用效率也随着 HTC 浆料闪蒸温度的升高而增加。耦合的 FSPG-ORC 系统将废热转化为电能，并提高了 HTC 工艺的能源效率。