基于Aspen Plus模拟WFGD对燃煤烟气有机污染物脱除的影响

Simulation of WFGD on the Removal of Coal-Fired Flue Gas Organic Pollutants Based on Aspen Plus

燃煤锅炉产生的烟气除含有SO_(2)、NO_(x)等常规无机污染物外,还包括多种具有较强毒性的有机污染物。利用Aspen Plus模拟软件建立了某630 MW燃煤锅炉烟气湿法脱硫(WFGD)装置的工艺流程,并基于灵敏度分析模块,研究了烟气温度、烟气流速、浆液温度、浆液pH值、SO_(2)浓度和NO浓度等工艺参数对脱硫反应过程中典型有机污染物脱除的影响。模拟结果表明:在设计工况下WFGD的脱硫效率高达99.41%,NO脱除效率约为10.87%,同时对苯、甲苯、二甲苯、苯酚、萘的脱除效率分别可达约70.56%、88.63%、93.24%、93.68%和67.53%,表明WFGD在高效脱除SO_(2)的同时,能够较好地协同脱除上述典型的燃煤有机污染物。

In addition to conventional inorganic pollutants such as SO_(2) and NO_(x),the flue gas produced by coal-fired boilers also includes a variety of highly toxic organic pollutants.Using Aspen Plus simulation software,the process flow of a 630 MW coal-fired boiler wet flue gas desulfurization device(WFGD)was established.Based on the sensitivity analysis module,effects of process parameters such as the flue gas temperature,flue gas flow rate,slurry temperature,slurry pH,and SO_(2) concentration and NO concentration on the removal of typical organic pollutants during the desulfurization reaction were studied.The simulation results show that under the design conditions,the desulfurization efficiency of WFGD is as high as 99.41%,the removal efficiency of NO is about 10.87%,and the removal efficiency of benzene,toluene,xylene,phenol and naphthalene can reach about 70.56%,88.63%,93.24%,93.68%and 67.53%,respectively,indicating that WFGD can effectively and synergistically remove typical organic pollutants above from coal combustion while efficiently removing SO_(2).