加湿热空气对流冷凝换热冷凝液量的实验研究

Experimental Research of Condensate Flow Rate of Convection-condensation Heat Exchange of Humidified Hot Air Flow

以冷凝式燃气锅炉的冷凝受热面为原型 ,采用加湿热空气模拟燃气锅炉的尾部烟气 ,通过单列光管间壁式换热器进行冷凝换热 ,在较宽广的加湿热空气温度 (10 0～ 2 0 0℃ )和水蒸气体积分数 (4 %～ 16 % )范围内研究了冷凝液量的生成规律。实验结果表明 :水蒸气分压力、冷却水流量和加湿热空气流量是影响水蒸气冷凝液量的主要因素 ,水蒸气的凝结率为 4 0 %～ 75 %。由实验数据进行多元线性回归分析 。

The condensing heating surfaces of a condensing-type gas-fired boiler were used to serve as a prototype. On this basis a simulation of the flue gases in the above-mentioned boiler tail section was conducted by using humidified hot air. Through a single-row bare-tube recuperater a condensation heat exchange was carried out. Within a relatively wide range of humidified hot air temperature (100-200°) and vapor volumetric factor (4% - 16%) a study was conducted of the generation law of condensate flow rate. The result of tests indicate that vapor partial pressure, cooling water flow rate and humidified hot airflow rate are major influencing factors of vapor condensate flow rate. Vapor condensation rate is 40% - 75%. After a multivariate linear regression analysis of experimental data a new empirical relation was proposed to calculate the condensate flow rate.