Preparation and performance evaluation of sludge incineration residue/potassium nitrate phase-change composites

doi:10.19799/j.cnki.2095-4239.2024.0253

Abstract

Abstract:

Improperly treated municipal sludge can lead to significant ecological damage, making it essential to find effective mitigation strategies. Incineration offers a viable solution to reduce this harm, but the resulting residue may still contain heavy metals that are difficult to stabilize. To effectively address this issue and develop low-cost and environmentally friendly composite phase change thermal storage materials, a novel approach proposes using municipal sludge incineration residue as the skeleton material and potassium nitrate as the phase change thermal storage material. Five different mass ratios of sludge incineration residue to potassium nitrate were prepared using cold-pressing and sintering methods. The materials were evaluated based on their macroscopic and microscopic appearances, compressive strength, thermal stability, chemical compatibility, heat transfer, and thermal storage properties. Economic feasibility and CO₂ emissions were also analyzed. The results show that within the temperature range of 100—380 ℃, the optimal mass ratio of sludge incineration residue to potassium nitrate is 5∶5 (sample SC3). This composition achieves a heat storage density of 322.45 J/g, latent heat of 41.75 J/g, and maximum thermal conductivity of 1.04 W/(m∙K). The compressive strength reaches 153.78 MPa, indicating that the materials exhibit good chemical compatibility and are evenly distributed in sample SC3. Additionally, sample SC3 shows good high-temperature thermal stability, maintaining performance after 1000 heating/cooling cycles. The thermal storage cost is calculated at 63.06 CNY/MJ, and the total CO₂ emissions are 1083.53 kg/t, which are lower than those associated with traditional skeleton material-based composite phase change thermal storage materials. This suggests that the approach offers both environmental benefits and practical feasibility.

Key words: municipal sludge, skeleton materials, thermal energy storage, thermal stability, chemical compatibility

CLC Number:

TB 34

Yaxuan XIONG, Xincheng YIN, Chaoyu SONG, Jing REN, Cancan ZHANG, Yuting WU, Yulong DING. Preparation and performance evaluation of sludge incineration residue/potassium nitrate phase-change composites[J]. Energy Storage Science and Technology, 2024, 13(10): 3357-3368.

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样品编号	SC1	SC2	SC3	SC4	SC5
污泥焚烧炉渣质量分数/%	55.0	52.5	50.0	47.5	45.0
硝酸钾质量分数/%	45.0	47.5	50.0	52.5	55.0

样品	比表面积/(m²/g)	孔体积/(mL/g)	平均孔径/nm
污泥焚烧炉渣	8.8046	0.1438	41.2054
SC2	0.3148	0.0025	7.8604
SC3	0.4108	0.0020	4.9222
SC4	0.1897	0.0027	6.7449

设备	干燥箱	球磨机	压力机	马弗炉	总计
工作时长/min	360	30	5	360	755
CO₂排放量/(kg/t)	135.63	10.36	104.55	372.99	623.53

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