在除尘灰中减少和铁的含量,通过煤热解热生成的H2
Zihan Wang1, Jianfeng Dong1, Jing Guo1
1School of Metallurgical Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Heliyon
|November 29, 2023
概括
这项研究利用煤热解来回收气,减少除尘灰中的和铁氧化物. 这一过程显著增加了金属化和脱硫率,为废物利用提供了可持续的解决方案.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 热解技术 热解技术
背景情况:
- 煤热解中的除尘灰含有有价值的和铁氧化物.
- 传统的减排方法往往有高碳消耗.
- 在煤热解过程中产生的 (H2) 是一种潜在的还原剂.
研究的目的:
- 调查使用从煤热解中回收的气来减少除尘灰中的和铁氧化物.
- 优化过程以减少碳消耗和提高回收率.
- 评估这种基于的减少方法的可行性和效率.
主要方法:
- 使用两种不同的方法来研究气体演变,进行了矿热解.
- 使用了热力学分析 (最小自由能原理) 和实验室实验.
- 系统地研究了温度,煤添加和保持时间对减少和挥发的影响.
主要成果:
- 在煤热解过程中释放的气 (H2) 峰值发生在700°C左右,热解在1000°C左右结束.
- 1000°C的热解气体富含H2 (84.4%在H2-H2O系统中) 和CO (74%在CO-CO2系统中),适合氧化物还原.
- 在906°C以上,氧化完全降解为蒸气;在810°C以上,随着H2/CO比率的增加,铁的降解会增加.
- 该工艺实现了超过95%的化率,在优化条件下 (1000°C,10重%碳) 的脱率从19.60%增加到大约98.76%.
结论:
- 从煤热解中回收的是除尘灰中的和铁氧化物的有效减少剂.
- 与传统方法相比,该过程显著降低了碳消耗.
- 高度的金属化和脱率证明了这种可持续的废物利用方法的技术和经济可行性.
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