To reduce CO emissions from coal-fired power plants, the development of low-carbon or carbon-free fuel combustion technologies has become urgent. As a new zero-carbon fuel, ammonia (NH) can be used to address the storage and transportation issues of hydrogen energy. Since it is not feasible to completely replace coal with ammonia in the short term, the development of ammonia–coal co-combustion technology at the current stage is a fast and feasible approach to reduce CO emissions from coal-fired power plants. This study focuses on modifying the boiler and installing two layers of eight pure-ammonia burners in a 300-MW coal-fired power plant to achieve ammonia–coal co-combustion at proportions ranging from 20% to 10% (by heat ratio) at loads of 180- to 300-MW, respectively. The results show that, during ammonia–coal co-combustion in a 300-MW coal-fired power plant, there was a more significant change in NO emissions at the furnace outlet compared with that under pure-coal combustion as the boiler oxygen levels varied. Moreover, ammonia burners located in the middle part of the main combustion zone exhibited a better high-temperature reduction performance than those located in the upper part of the main combustion zone. Under all ammonia co-combustion conditions, the NH concentration at the furnace outlet remained below 1 parts per million (ppm). Compared with that under pure-coal conditions, the thermal efficiency of the boiler slightly decreased (by 0.12%–0.38%) under different loads when ammonia co-combustion reached 15 t·h. Ammonia co-combustion in coal-fired power plants is a potentially feasible technology route for carbon reduction.

中文翻译：

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300MW燃煤电站锅炉氨与煤混烧减碳试验研究


为了减少燃煤电厂的二氧化碳排放，开发低碳或无碳燃料燃烧技术已刻不容缓。氨（NH）作为一种新型零碳燃料，可用于解决氢能的储存和运输问题。由于短期内不可能完全用氨替代煤炭，现阶段发展氨煤混燃技术是减少燃煤电厂CO排放的快速可行的途径。本研究重点对某300MW燃煤电厂锅炉进行改造，安装两层8个纯氨燃烧器，实现20%~10%（热比）的氨煤混燃。负载分别为 180 至 300 MW。结果表明，300MW燃煤电厂氨煤混燃时，随着锅炉含氧量的变化，炉膛出口NO排放量较纯煤燃烧时有更显着的变化。 。此外，位于主燃烧区中部的氨燃烧器比位于主燃烧区上部的氨燃烧器表现出更好的高温还原性能。在所有氨共燃条件下，炉出口处的 NH 浓度保持在百万分之一 (ppm) 以下。与纯煤工况相比，当氨混燃达到15 t·h时，不同负荷下锅炉热效率略有下降（下降0.12%~0.38%）。燃煤电厂氨混燃是一种潜在可行的减碳技术路线。