A novel coal purification-combustion system: Effects of activation atmosphere on product characteristics and system efficiency

IF 6.1 2区工程技术 Q2 ENERGY & FUELS

Applied Thermal Engineering Pub Date : 2025-05-09 DOI:10.1016/j.applthermaleng.2025.126768

Ruifang Cui , Qiangqiang Ren , Shaobo Yang , Shaobo Han , Yujie Hu

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引用次数: 0

Abstract

To support the goal of carbon neutrality, a novel coal purification-combustion technology has been developed to enhance the clean and efficient utilization of coal. In this study, experiments were conducted on a 200 kW coal purification-combustion platform to systematically investigate the impact of activation atmospheres on fuel performance and process irreversibility. Thermodynamic analyses and physicochemical characterizations were employed to correlate microstructural evolution with macroscopic performance. Under a 29 % O₂/CO₂ activation atmosphere, the semi-coke produced with the most active sites and the lowest gasification activation energy. Moreover, during the high-temperature reduction (HTR) stage, enhanced gasification rates and increased yields of CO and H₂ effectively reduced irreversible losses. The highest exergy efficiency of 74.47 % was achieved during the purification process under 25 % O₂/CO₂ activation. By optimizing the exergy distribution of purified fuel and improving the combustion characteristics of purified fly ash, the irreversibility in the mild combustion unit was significantly reduced. Overall, under 25 % O₂/CO₂ condition, the purification-combustion system achieved a peak exergy efficiency of 54.5 %. In summary, this study provides valuable insights into enhancing coal utilization efficiency, advancing clean coal technology and promoting sustainable energy conversion.

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一种新型煤净化燃烧系统：活化气氛对产品特性和系统效率的影响

为了实现碳中和的目标，一种新型的煤净化燃烧技术被开发出来，以提高煤的清洁和高效利用。本研究在一个200kw的煤净化燃烧平台上进行了实验，系统研究了活化气氛对燃料性能和过程不可逆性的影响。采用热力学分析和物理化学表征将微观结构演变与宏观性能联系起来。在O2/CO2浓度为29%的活化气氛下，半焦的活性位点最多，气化活化能最低。此外，在高温还原（HTR）阶段，气化速率的提高和CO和H2产率的增加有效地减少了不可逆损失。在25% O2/CO2活化条件下，净化过程的最高火用效率为74.47%。通过优化纯化燃料的火用分配和改善纯化粉煤灰的燃烧特性，显著降低了轻度燃烧装置的不可逆性。总体而言，在25%的O2/CO2条件下，净化燃烧系统的最高火用效率为54.5%。综上所述，本研究为提高煤炭利用效率、推进清洁煤技术、促进可持续能源转换提供了有价值的见解。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.