Ren Lachun, Shang Xinxin, Xie Jingjing, Chen Jiechao, Gu Yanan
Power China Construction Group Urban Planning and Design Research Institute Corporation Limited, Guangdong Provincial Engineering Research Center for Advanced Energy Systems, Guangzhou 510000, China.
Guangdong Provincial Key Laboratory of Distributed Energy System, Dongguan University of Technology, Dongguan 523820, China.
ACS Omega. 2024 Dec 5;9(50):49387-49396. doi: 10.1021/acsomega.4c06787. eCollection 2024 Dec 17.
To comprehensively explore syngas cocombustion technology, gasification experiments in a bench-scale circulating fluidized bed (CFB) and three-dimensional (3D) numerical simulations of a coal-fired boiler furnace have been conducted. In the amplification experiment of biomass gasification, sawdust has been gasified using air, oxygen-enriched air, and steam. The highest heating value of the syngas products reaches 12.3 MJ/m when the equivalence and steam/biomass ratios are adjusted in the ranges of 0.21-0.31 and 0.1-0.5, respectively. Subsequently, 3D numerical simulation has been performed with several kinds of syngas product to analyze the cocombustion characteristics of the boiler furnace. Results demonstrate that the velocity field of the boiler furnace exhibits a well-formed tangential velocity circle and full degree of streamlines. Syngas cocombustion in the coal-fired furnace reduces the temperature extremum in the combustion zone. Radiant heat flux accounts for >88% of the total heat flux in the furnace. The outlet NO concentration in the case of syngas cocombustion is less than that of pure coal combustion, and it is reduced approximately 25 and 40 mg/m at cocombustion ratios of 0.1 and 0.15, respectively.
为全面探索合成气共燃技术，开展了实验室规模循环流化床（CFB）气化实验以及燃煤锅炉炉膛的三维（3D）数值模拟。在生物质气化放大实验中，使用空气、富氧空气和蒸汽对锯末进行了气化。当当量比和蒸汽/生物质比分别在0.21 - 0.31和0.1 - 0.5范围内调整时，合成气产物的最高热值达到12.3 MJ/m³。随后，对几种合成气产物进行了三维数值模拟，以分析锅炉炉膛的共燃特性。结果表明，锅炉炉膛的速度场呈现出良好形成的切向速度环和流线完整度。合成气在燃煤炉中共燃降低了燃烧区的温度极值。辐射热流占炉膛总热流的比例大于88%。合成气共燃情况下的出口NO浓度低于纯煤燃烧，在共燃比为0.1和0.15时，分别降低了约25和40 mg/m³。
