CAJ | 학술논문

采用Euler-Lagrange方法建立了双循环湿法烟气脱硫塔内气液两相流体动力学模型，并基于双膜理论建立了SO2传质模型。通过相应的用户自定义函数模块将SO2吸收程序嵌入FLUENT软件，对中试双循环湿法烟气脱硫塔进行了模拟计算，模拟结果由对应的中试试验进行了验证。分析了主要运行参数对脱硫效率的影响，讨论了上、下循环回路中的气液膜传质阻力。结果表明：液气比和截面气速增大有利于提高脱硫效率；塔内气液传质过程整体为液膜控制，下循环气液膜阻力比约为0.35，上循环约为0.65。模拟结果同试验数据相比误差在5％以内，说明该数值模拟方法可以用来指导大型双循环塔的优化设计和预测塔内SO2分布及脱硫效率。
채용Euler-Lagrange방법건립료쌍순배습법연기탈류탑내기액량상류체동역학모형，병기우쌍막이론건립료SO2전질모형。통과상응적용호자정의함수모괴장SO2흡수정서감입FLUENT연건，대중시쌍순배습법연기탈류탑진행료모의계산，모의결과유대응적중시시험진행료험증。분석료주요운행삼수대탈류효솔적영향，토론료상、하순배회로중적기액막전질조력。결과표명：액기비화절면기속증대유리우제고탈류효솔；탑내기액전질과정정체위액막공제，하순배기액막조력비약위0.35，상순배약위0.65。모의결과동시험수거상비오차재5％이내，설명해수치모의방법가이용래지도대형쌍순배탑적우화설계화예측탑내SO2분포급탈류효솔。
A gas-liquid hydrodynamic model was established by the Euler-Lagrange method to simulate a pilot-scale double-loop wet flue-gas desulfurization (WFGD)reactor.The SO2 absorption mass-transfer model was primarily built on the dual-film theory,and the SO2 absorption procedure was implemented in the commercial software FLUENT through a user-defined function (UDF).The relationship between main operation parameters and the SO2 removal effi-ciency was analyzed,and the gas and liquid side mass transfer resistance was also discussed.Results showed that the desulfurization efficiency rised by increasing liquid-to-gas ratios and reduced with the improving of superficial gas veloc-ity.Gas film resistance to liquid film resistance ratio was about 0.35 in the lower-loop,while 0.65 in the upper-loop. Studies on the pilot-scale double-loop WFGD tower showed that the simulated SO2 removal efficiency agreed well with the experimental data,with an error of less than 5%.Therefore,the mathematical model can be used to optimize full-size double-loop WFGD structures,as well as to predict the SO2 distribution and desulfurization efficiency.