Abstract H2-rich gas has been widely regarded as a promising energy to substitute fossil energy in iron ore sintering process for CO2 reduction. This investigation mainly focused on researching the influences of H2-rich gas injection parameters over sintering bed on sintering performance, and elucidated the potential function mechanism through both experiment and numerical simulation. Results indicated that increasing injection concentration and prolonging injection time within a proper range improved sinter quality, and the recommended value was 0.6∼0.8 % and 8 min, respectively. Injecting H2-rich gas at earlier sintering stages achieved greater improvement in sintering quality compared with the ones injecting at later sintering stages, and the recommended injection area was 5∼13min. Both experiment and numerical simulation results indicated that injecting H2-rich improved the thermal patterns of sintering bed, with extended high-temperature areas for increasing the generation of high-strength calcium ferrite. Especially when injecting H2-rich gas under the recommended parameters, the heat distribution in sintering bed was optimized and the sintering quality of upper sintering layer was obviously improved. Finally, an injection method for guiding the industrial application with its essence to inject H2-rich at earlier sintering stages was proposed. The research findings provide a promising way for the efficient utilization of clean energy in iron ore sintering plants.

中文翻译：

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富氢能源在铁矿石烧结中的应用洞察：参数优化及作用机理

摘要 富H2 气体被广泛认为是替代化石能源用于铁矿石烧结过程中CO2 还原的一种很有前景的能源。本研究主要研究烧结床上富H2气体注入参数对烧结性能的影响，并通过实验和数值模拟阐明其势函数机制。结果表明，在适当范围内增加注入浓度和延长注入时间可以提高烧结质量，推荐值分别为0.6～0.8%和8min。与烧结后期注入富H2气体相比，烧结前期注入富H2气体对烧结质量有较大的改善，推荐注入面积为5～13min。实验和数值模拟结果表明，注入富氢改善了烧结床的热模式，扩大了高温区域以增加高强度铁酸钙的生成。特别是在推荐参数下注入富H2气体时，优化了烧结床内的热量分布，上层烧结层的烧结质量明显提高。最后，提出了一种指导工业应用的注入方法，其本质是在早期烧结阶段注入富氢。研究成果为铁矿石烧结厂清洁能源的高效利用提供了一条有前景的途径。具有扩展的高温区域，以增加高强度铁酸钙的生成。特别是在推荐参数下注入富H2气体时，优化了烧结床内的热量分布，上层烧结层的烧结质量明显提高。最后，提出了一种指导工业应用的注入方法，其本质是在早期烧结阶段注入富氢。研究成果为铁矿石烧结厂清洁能源的高效利用提供了一条有前景的途径。具有扩展的高温区域，以增加高强度铁酸钙的生成。特别是在推荐参数下注入富H2气体时，优化了烧结床内的热量分布，上层烧结层的烧结质量明显提高。最后，提出了一种指导工业应用的注入方法，其本质是在早期烧结阶段注入富氢。研究成果为铁矿石烧结厂清洁能源的高效利用提供了一条有前景的途径。提出了一种指导工业应用的注入方法，其本质是在早期烧结阶段注入富氢。研究成果为铁矿石烧结厂清洁能源的高效利用提供了一条有前景的途径。提出了一种指导工业应用的注入方法，其本质是在早期烧结阶段注入富氢。研究成果为铁矿石烧结厂清洁能源的高效利用提供了一条有前景的途径。