The circulating fluidized bed (CFB) units, with their robust combustion stability under low load conditions, are poised to play a significant role in future deep peak shaving of power grids. However, issues such as NOx emissions exceedance arise when the CFB unit operates for deep peak shaving. To mitigate these problems, this paper innovatively proposes a CFB coal blended with the high-temperature activated gas-solid binary fuel combustion mode to reduce the NOx emissions of the CFB across a wide load range. The wide load operation characteristics of the CFB under the action of high-temperature activated gas-solid binary fuel were initially examined on a 2 MW experimental platform. A comparison between the conventional combustion mode and the CFB coal blended with high-temperature activated gas-solid binary fuel combustion mode revealed that the latter improved the uniformity of temperature distribution within the CFB across a wide load range, particularly at lower loads. Furthermore, the CFB coal blended with high-temperature activated gas-solid binary fuel significantly reduced the original NOx emissions, decreasing from 136.9 mg/m3, 37.5 mg/m3, and 38.8 mg/m3 to 92.0 mg/m3, 24.7 mg/m3 and 20.6 mg/m3 at 100 %, 50 %, and 30 % load respectively, thereby achieving ultralow original NOx emissions during deep peak shaving operations. However, there is room for improvement in enhancing combustion efficiency using this combustion mode.

中文翻译：

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高温活化气固二元燃料作用下循环流化床宽载运行特性的实验研究


循环流化床 （CFB） 装置在低负载条件下具有强大的燃烧稳定性，有望在未来电网的深调峰中发挥重要作用。然而，当 CFB 装置进行深峰调峰时，会出现 NOx 排放超标等问题。为了缓解这些问题，本文创新性地提出了一种CFB煤与高温活化气-固二元燃料混合燃烧模式，以减少CFB在宽负荷范围内的NOx排放。在 2 MW 实验平台上初步研究了 CFB 在高温活性气固二元燃料作用下的宽负载运行特性。传统燃烧模式与循环流化床煤与高温活化气固二元燃料混合燃烧模式的比较表明，后者在较宽的负载范围内提高了循环流化床内温度分布的均匀性，尤其是在较低负载下。此外，在100 %、50 %和30 %负荷下，CFB煤与高温活性气-固二元燃料混合显著降低了原始NOx排放，从136.9 mg/m3、37.5 mg/m3和38.8 mg/m3下降到92.0 mg/m3、24.7 mg/m3和20.6 mg/m3，从而在深调峰作业中实现了超低的原始NOx排放。然而，使用这种燃烧模式提高燃烧效率还有改进的空间。