Design and operational performance evaluation of an integrated hydrothermal carbonization waste heat recovery and solar energy collection system

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-03-07 DOI:10.1016/j.energy.2025.135472

Ruikun Wang , Yukun Wu , Jiandong Jia , Jichao Wei , Lichao Ge , Yue Zhang , Peng Gao

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引用次数: 0

Abstract

Hydrothermal carbonization is a promising technology to convert sludge into solid fuel. However, a high energy consumption is required because the hydrothermal carbonization is operated at high temperature. Therefore, an integrated system of hydrothermal carbonization waste heat recovery and solar energy collection was proposed. This system recovered energy from the slurry product through a two-stage flash evaporation process, in which the steam from the first stage and the second stage were used for drying the semi-dry hydrochar and heating the raw sludge material, respectively. In addition, solar energy was collected to heat the sludge material. When 1 ton of sludge was treated under an hydrothermal carbonization temperature of 220 °C, 49.6 kg steam with energy of 127.31 MJ was recovered in the first stage flash evaporation, which could cover the heat required for drying the semi-dry hydrochar. Moreover, 147.3 kg of steam with energy of 426.97 MJ was recovered at the second stage flash evaporation, which was used to heat the raw sludge material, as well as the collected solar energy of 302.80 MJ. The exergy efficiency of the system was 54.84 %, and the exergy loss was caused mainly due to filtrate discharge, which accounted for 72.2 % of the total exergy loss.

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.