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以清华大学专利技术“卧式循环流化床锅炉”为研究对象,用数值模拟的方法计算了炉内的流动和燃烧。以RNG k-ε模型模拟炉内湍流流动,用气固阻力分析模型描述气固两相相互作用,用单收缩核模型模拟炉内燃烧反应,并将数值计算结果与试验数据进行了比较,验证了所用模型的适用性及兼容性。数值模拟结果表明:1.5∶1的一二次风比率较适宜锅炉运行,床温的变化滞后于给料量的变化。该研究可以指导卧式循环流化床锅炉的设计和运行。
Taking Tsinghua University’s patented technology “Horizontal Circulating Fluidized Bed Boiler” as the research object, the flow and combustion in the furnace were calculated by numerical simulation. The RNG k-ε model was used to simulate the turbulent flow in the furnace. The gas-solid resistance analysis model was used to describe the gas-solid interaction. The single-contracted nuclear model was used to simulate the combustion in the furnace. The numerical results were compared with the experimental data to verify The applicability and compatibility of the model used. The numerical simulation results show that the ratio of primary to secondary air of 1.5:1 is more suitable for boiler operation, and the change of bed temperature lags behind the change of feeding amount. This study can guide the design and operation of horizontal circulating fluidized bed boilers.