基于Runge-Kutta法的船舶湿法脱硝过程的建模与分析

Modeling and analysis of ship wet denitration process based on Runge-Kutta method

为了准确预测过硫酸盐去除NO的反应过程与最终效率,在MATLAB数学软件中使用四阶Runge-Kutta方法对Yusuf G.Adewuyi提出的湿法脱硝反应途径与反应动力学进行建模并求解,将模拟结果与其实验值进行拟合,对比后表明该模型有很好的拟合度,得出了温度的升高对整个反应起到促进作用,且过硫酸盐浓度越高对温度的变化越敏感,同时温度越高反应到达稳定的时间越短;在所有温度条件下过硫酸盐的消耗呈线性降低,且直至反应达到稳定状态,过硫酸盐的消耗量均小0.02 mol/L,当过硫酸盐浓度升高到一定值后,其对反应的促进作用变得缓慢;Fe2+在反应初期就会被快速消耗,且它的存在会将整体脱硝反应的效率提升约10%。

In order to accurately predict the reaction process and the final persulfate removal efficiency of NO,the fourth-order Runge-Kutta method was used to model and solve the wet denitration reaction pathway and the reaction kinetics proposed by Yusuf G.Adewuyiin MATLAB mathematical software.The simulation results were fitted with their experimental values.The comparison shows that the model has a good fit,and the increase intemperature canpromote the entire reaction.Besides,the persulfateis more sensitive to temperature changes whenits concentration is higher.At the same time,the higher the temperature,the shorter the reaction time to reach its stabilization.Under all temperature conditions,the consumption of persulfate decreases linearly and is less than 0.02 mol/L until the reaction reaches a stable state.Moreover,the promoting effect of persulfate on the reaction become slow when its concentration increases to a certain value.Finally,Fe2+is quickly consumed in the early stage of the reaction,while it also increases the efficiency of the overall denitration reaction by about 10%.