Experimental research on wide load operation characteristics of circulating fluidized bed under the action of high-temperature activated gas-solid binary fuels

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 x 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 x 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 x emissions, decreasing from 136.9 mg/m3, 3 , 37.5 mg/m3, 3 , and 38.8 mg/m3 3 to 92.0 mg/m3, 3 , 24.7 mg/m3 3 and 20.6 mg/m3 3 at 100 %, 50 %, and 30 % load respectively, thereby achieving ultralow original NOx x emissions during deep peak shaving operations. However, there is room for improvement in enhancing combustion efficiency using this combustion mode.