高速空气冷却单管管壁温度理论计算模型与实验验证

Theoretical Model for Wall Temperature of the High-speed Air-cooled Single-tube and the Experimental Verification

建立了空气冷却单管受热面外壁温度理论计算模型,并在高温烟气与空气冷却单管传热特性研究实验台上进行了验证。通过调整流经单管内的空气流速可实现在高温烟气环境中单管受热面外壁温度的连续可调可控,所得研究结果为空气冷却方式应用于高钠煤对单管沾污结渣特性研究提供了理论和实验依据。

the theoretical model for wall temperature of air-cooled single-tube was established, and the experiment of the wall temperature of air-cooled single-tube was done in the heat transfer test rig with high temperature flue gas. The experimental results show that the wall temperature of the air-cooled single-tube in the high temperature flue gas could be adjusted and controlled continuously by changing the air velocity, and have a good agreement with the calculating results of the theoretical model. The results of the theoretical model and experiment show that the high-speed air-cooled single tube could be used to simulate the wall temperature of the heat exchanger tubes of the coal fired boilers, and it could be used to investigate the characteristics of fouling and slagging in the heat exchangers of the high- sodium coal fired boilers.