Sun Jianguo, Liu Qian, Peng Fei, Gu Yonghua
State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, School of Energy and Environment, Southeast University, Nanjing, 210096, China.
State Key Laboratory of Low-carbon Smart Coal-fired Power Generation and Ultra-clean Emission, School of Energy and Environment, Southeast University, Nanjing, 210096, China.
J Environ Manage. 2025 Jan;373:123582. doi: 10.1016/j.jenvman.2024.123582. Epub 2024 Dec 5.
Finding alternative energy sources and reducing the impact of waste on the environment are pressing global challenges. Crab shells possess the dual characteristics of a pollutant and a resource; therefore, transforming them into clean energy is an urgent issue that needs to be addressed for reducing environmental pollution. This study uses microwave torrefaction to treat crab shell waste efficiently and optimizes the torrefaction conditions through response surface methodology to rapid prepare derived fuel. At a microwave power of 2500 W, temperature of 225 °C, and a treatment duration of 11 min, the specific surface area of the crab shell derived fuel increased by 21.2%; furthermore, its high heating value increased from 14.41 to 18.18 MJ/kg and combustion and desulfurization performances improved considerably. As a proof-of-concept, these derived fuels were utilized as substitutes for fossil fuels and as desulfurization agents to capture SO in situ during coal combustion. Results indicated that after microwave torrefaction, the desulfurization capability of the crab shell derived fuel increased by 16.6%. At a derived fuel and coal blending ratio of 35%, SO emissions were reduced by 85.27%, with more desulfurization efficiency compared with conventional calcium-based dry desulfurization. To the best of our knowledge, this is the first report on using crab shell waste as derived fuel to achieve in situ SO capture. Given the low cost and renewability of crab shell, our study provides a promising strategy for the large-scale utilization of solid waste and its harmless disposal.
寻找替代能源以及减少废物对环境的影响是全球面临的紧迫挑战。蟹壳具有污染物和资源的双重特性；因此，将其转化为清洁能源是减少环境污染亟待解决的问题。本研究采用微波烘焙法高效处理蟹壳废弃物，并通过响应面法优化烘焙条件以快速制备衍生燃料。在微波功率2500W、温度225℃、处理时间11min的条件下，蟹壳衍生燃料的比表面积增加了21.2%；此外，其高位发热量从14.41MJ/kg提高到18.18MJ/kg，燃烧和脱硫性能也有显著改善。作为概念验证，这些衍生燃料被用作化石燃料的替代品，并作为脱硫剂在煤炭燃烧过程中原位捕获SO。结果表明，经过微波烘焙后，蟹壳衍生燃料的脱硫能力提高了16.6%。在衍生燃料与煤炭的混合比例为35%时，SO排放量减少了85.27%，与传统钙基干法脱硫相比具有更高的脱硫效率。据我们所知，这是首次关于利用蟹壳废弃物作为衍生燃料实现原位SO捕获的报道。鉴于蟹壳成本低廉且可再生，我们的研究为大规模利用固体废物及其无害化处理提供了一种有前景的策略。
