复合喷动塔内蒸发特性的数值模拟与实验研究.pdfVIP

环 　境 　工 　程 2009 年 12 月第 27 卷第 6 期 79 复合喷动塔内蒸发特性的数值模拟与实验研究 陈国庆 　高继慧 　龚泽儒 　高建民　秦裕琨 ( 哈尔滨工业大学燃烧工程研究所 ,哈尔滨 150001) 摘要 :分析了描述喷动塔内气液流动 、雾化 、蒸发 、碰壁的数学模型 ,运用上述模型模拟脱硫塔内蒸发特性 ,得到了入 口 介质条件对塔内蒸发特性及液相水含量的影响 ,通过与实验值比较验证了模型的可靠性 。模拟结果表明:液滴蒸发强 度呈现先升高后降低趋势 ,在距离喷嘴300 mm处达到最大值 ;在一 、二级塔体交界处 , 由于受多级喷动结构影响 ,液滴 蒸发速率明显升高 ;液滴截面质量流率沿塔体轴向逐渐降低 ,在1 500 m处基本蒸发完毕 ;蒸发强度与喷嘴雾化压力呈 非单调关系 ,烟气温度和含湿量对一级塔内液态水含量有 3 倍～5 倍的影响 ;数值模拟结果与实验值基本一致 ,可以 作为研究塔内液滴蒸发特性的有效工具 。 关键词 :截面蒸发速率 ;蒸发特性 ;复合喷动 ;脱硫反应塔 ;数值模拟 NUMERICAL SIMULATION AND EXPERIMENTAL STUDY ON EVAPORATION CHARACTERISTICS IN MUL TISPOUTED BED Chen Guoqing 　 Gao Jihui 　Gong Zeru 　Gao Jianmin 　Qin Yukun ( Institute of Combustion Engineering , Harbin Institute of Technology , Harbin 150001 ,China) Abstract : The mathematic models of gas and droplet flow , droplet atomization , evaporation , and impingement were analysed. The evaporation characteristics were got under different medium conditions , such as flue gas temperature , atomization pressure and flue gas relative humidity. In order to validate the reliability of the models used , the experiment was done . The simulation results indicate that evaporating intensity reaches its peak value in the area of 300 mm away from the sprayer . Due to the multispouted configuration , droplet concentration increases obviously in the intersecting region between the first and second reaction region . Droplet intersection mass flow rate reduces along the axis , and droplets are completely evaporated at 1 500 mm away from the sprayer . The re