循环流化床二次风射流穿透规律的试验研究

Experimental Study on Secondary Air Jet Penetration in Circulating Fluidized Bed

在一个截面尺寸为0.3 m×0.3 m×4 m的循环流化床冷态试验台上,以热空气作为示踪气体,对二次风射流穿透深度规律进行了试验研究.利用热电偶测量试验段温度场得到二次风射流轨迹,基于交叉射流动量比建立了二次风射流穿透深度的模型.利用该模型对1台465 t/h循环流化床锅炉二次风射流进行预测,并与热态测试结果进行了对比,从而验证了模型的正确性.

To investigate the penetration depth of the secondary air jet in circulating fluidized bed boiler, experimental study was carried out on a cold model test rig of 0.3 m × 0.3 m × 4 m by use of the hot air as the tracer gas. The secondary air jet pathways were obtained from the temperature field measured by the thermocouples in the test section. The penetration depth model of the secondary air jet was set up based on the momentum ratio of the cross jets. The model was applied to a 465 t/h circulating fluidized bed boiler to predict the secondary air jet penetration, and compared with the hot state test reults, which verifies the validity of the model.