While coal–biomass cocombustion has gained considerable attention as a climate-sensitive power generation strategy, the detrimental impact of inorganic species present in low-rank fuels can lead to counterproductive outcomes in combustion systems. Low-rank solid fuels negatively affect heat transfer efficiency and energy conversion during steam generation, resulting in adverse environmental consequences. However, a combination of improved combustion technology and fuel quality improvements can enable the safe utilization of these fuels. This review highlights the pressing need for research in fuel quality improvement as an effective climate change mitigation strategy during the global transition to renewable energy sources. Identifying the problematic species in solid fuels and understanding the mechanisms of ash formation are critical steps toward designing effective strategies to control ash aerosol-induced fouling. The paper discusses methods for promoting clean combustion, including fuel pretreatment and cocombustion. Additionally, the review examines recent advancements in fuel improvement strategies, such as CFD-targeted-in-furnace injection (CFD-TIFI), intelligent soot blowing, and fuel additive technology, with a focus on mineral additives. Due to its high efficiency, low cost, and minimal retrofit requirements, additive technology holds promise for large-scale applications, paving the way for fuel flexibility in utility-scale power generation. The current study emphasizes the importance of fuel ash mineral transformation and characterization techniques for evaluating the effectiveness of fuel additives. Assessing the viability of utility-scale applications economically and the feasibility of a large-scale demonstration requires further research.

中文翻译：

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燃煤和生物质燃烧系统中低阶燃料高效利用的进展：综合综述


虽然煤-生物质共燃作为一种气候敏感的发电策略受到了相当多的关注，但低级燃料中存在的无机物质的有害影响可能会导致燃烧系统产生适得其反的结果。低阶固体燃料会对蒸汽产生过程中的传热效率和能量转换产生负面影响，从而导致不利的环境后果。然而，改进的燃烧技术和燃料质量的改进相结合可以实现这些燃料的安全利用。本次审查强调了在全球向可再生能源转型期间，迫切需要对改善燃料质量进行研究，作为有效的气候变化缓解策略。识别固体燃料中的问题物种并了解灰烬形成机制是设计有效策略控制灰气溶胶引起的污垢的关键步骤。本文讨论了促进清洁燃烧的方法，包括燃料预处理和混合燃烧。此外，该综述还探讨了燃料改进策略的最新进展，例如 CFD 定向炉内喷射 (CFD-TIFI)、智能吹灰和燃料添加剂技术，重点关注矿物添加剂。由于其高效率、低成本和最小的改造要求，增材技术有望大规模应用，为公用事业规模发电的燃料灵活性铺平道路。目前的研究强调了燃料灰分矿物转化和表征技术对于评估燃料添加剂有效性的重要性。评估公用事业规模应用的经济可行性和大规模示范的可行性需要进一步研究。