ZhaoZhi,LiuJinxin,HuangZhaowei,et al.Synergistic Regulation of Sludge Thermal Drying Efficiency and Fuel Properties by Temperature and Carbon-based Skeleton[J].China Water & Wastewater,2026,42(13):1-8.
温度与碳基骨架协同调控污泥热干化效能与燃料特性
- Title:
- Synergistic Regulation of Sludge Thermal Drying Efficiency and Fuel Properties by Temperature and Carbon-based Skeleton
- Keywords:
- sludge; carbon?based skeleton; thermal drying; water release; fuel properties
- 摘要:
- 在污泥热干化过程中，水分蒸发消耗大量能量，污泥黏附设备内壁后传热效率下降，甚至引发运行中断，存在高能耗与运行不稳定的问题。为此，在80~250 ℃宽温度区间内进行污泥热干化实验，探究温度与碳基骨架对污泥热干化效能与燃料特性的协同调控机制。结果表明，温度升高会加速水分蒸发，碳基骨架通过构建多孔“水分通道”与提供“刚性支撑”使污泥初始内聚应力和黏附应力分别降低43%和37%，提高了运行稳定性，在130 ℃条件下实现干化时间缩减53.5%、干化效果提升17%、干化能耗降低77.8%。温度超过190 ℃将引发脂类与蛋白质的显著热分解，导致C、H元素损失，使燃料热值下降高达44%。因此，对污泥进行碳基骨架调质并在130 ℃下进行热干化，可实现污泥的高效脱水和能源化利用的双重目标。
- Abstract:
- In the sludge thermal drying process, water evaporation consumes a large amount of energy, and the sludge adheres to the inner wall of the equipment, which reduces the heat transfer efficiency and even triggers the interruption of operation, resulting in high energy consumption and unstable operation. To this end, sludge thermal drying experiments were carried out in a wide temperature range of 80-250 ℃ to investigate the synergistic control mechanism of temperature and carbon?based skeleton on the sludge thermal drying efficiency and fuel properties. The results showed that the temperature increase accelerated water evaporation, and the carbon?based skeleton reduced the initial cohesive stress and adhesion stress of sludge by 43% and 37% respectively through the construction of porous water channels and the provision of rigid support, and improved the stability of the operation. The drying time was reduced by 53.5%, the drying efficiency was increased by 17%, and the drying energy consumption was reduced by 77.8% under the condition of 130 ℃. Temperatures exceeding 190 ℃ will lead to significant thermal decomposition of lipids and proteins, resulting in the loss of C and H elements and a decrease in the calorific value of the fuel by up to 44%. Therefore, carbon?based skeleton conditioning of sludge and thermal drying at 130 ℃ can achieve the dual goals of efficient dewatering and energy utilization of sludge.
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