用吉布斯自由能最小化方法模拟垃圾气化熔融工艺

基于吉布斯(Gibbs)自由能最小化方法建立了城市生活垃圾气化熔融技术工艺模型，模拟计算结果与已有文献的试验结果吻合良好。通过敏感性分析，获得了垃圾气化气体低位热值和熔融温度的相互关系，在此基础上，讨论了城市生活垃圾低位热值、垃圾含水率和气化炉过量空气系数对气化气体低位热值和气化温度的影响规律。结果表明：在无辅助热源情况下，进入熔融炉的气化气体低位热值必须高于3000kJ/m3，其燃烧绝热火焰温度方能达到1 350℃；气化气体低位热值随垃圾低位热值的增大和气化过量空气系数的减小而显著增高；气化温度随垃圾含水率的降低和过量空气系数的增大呈现线性升高趋势。模拟结果可为确定适合气化熔融技术的垃圾基本特性参数提供有益参考。

Simulation of Gasification and Melting of Municipal Solid Waste by Method of Gibbs Free Energy Minimization

Model of gasification and melting of the municipal solid waste (MSW) was established by the method of Gibbs free energy minimization. Model predictions were compared with published experimental data and the agreement is generally satisfying, therefore, correctness of the proposed model is demonstrated. Sensitivity analyses were carried out in order to investigate the relationship between the fuel gas low heating value (LHV) and melting temperature. On the base, main effects of LHV and moisture content of MSW, excessive air ratios aEAR of gasifying were analyzed on the fuel gas LHV and gasifying temperature. Results show that the fuel gas LHV must be higher than 3000kJ/m3, melting temperature could achieve 1350℃ without the auxiliary heat source. Higher LHV of MSW and lower aEAR cause higher LHV of the fuel gas. Gasifying temperature shows a liner increase along with decreasing of moisture content of MSW and increasing of aEAR . The simulated results offer some useful references to determine MSW characteristic parameters suitable for gasification and melting technology.