现场煤炭燃烧对CO2捕获的CaO颗粒的双重影响:高温烧结和灰稳定
Yun Long1, Changqing Wang1, Ruichang Xu1
1State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
International journal of molecular sciences
|September 13, 2025
概括
高温氧化 (CaO) 吸附剂在煤炭燃烧过程中通过烧结失活. 然而,-灰保护吸附剂,在多个循环中提高稳定性.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
- 环境科学 环境科学
背景情况:
- 基于高温氧化 (CaO) 的二氧化碳 (CO2) 捕获与现场煤炭燃烧相结合,提供了高能效和成熟度.
- 在工业煤炭燃烧条件下,颗粒化CaO吸附剂中的吸附剂失活机制尚不清楚.
研究的目的:
- 研究与不同类型的煤炭共同燃烧时颗粒化CaO吸收剂的失活机制.
- 阐明高温烧结和灰稳定在吸附剂性能中的竞争作用.
主要方法:
- 颗粒化CaO吸附剂与四个不同,硫和灰含量的煤一起燃烧.
- 在单个和多个联合燃烧周期后,分析了吸附剂特性 (特定表面积,孔积) 和二氧化碳捕获能力.
- 通过分析烧结和灰沉积效应来解开机制.
主要成果:
- 在单次联合燃烧过程中,高温烧结 (>900°C) 造成了显著的孔隙崩,减少了表面积 (29%) 和孔隙体积 (50%),导致最初的二氧化碳捕获能力急剧下降.
- - (Si-Al) 灰成分在重复循环 (1-9) 中积聚在吸附剂上,形成一个保护层.
- 这种灰层在20个周期内将二氧化碳捕获能力的损失从17.6%降至3.9%,显著提高了吸附剂的稳定性.
结论:
- 确定了两个相互竞争的停用机制:高温烧结和Si-Al灰稳定.
- 精确控制燃烧温度场对于减轻烧结和优化工业基于CaO的二氧化碳捕获系统至关重要.
- 这些发现为提高CaO吸附剂的长期性能和工业可行性提供了理论基础.
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