摘要
为了对大唐多伦煤制烯烃项目Shell气化炉的稳定运行提供技术支持,根据粉煤气流床气化炉碳转化率高、高温下反应接近平衡的特征,基于Gibbs自由能最小化法,建立了Shell粉煤气化平衡模型。通过对模型进行气化反应限制和热损失修正,计算值与运行值吻合较好。利用建立的模型,研究了碳转化率、不同煤粉输送载气、氧煤比等参数对气化性能的影响。结果表明:碳转化率的升高,可以使有效气组成增加;相同流量条件下,CO2作为载气,气化得到的有效气组成略高于N2;增大氧煤比,导致有效气组成先增加后减小,分析得出研究工况的最佳氧煤比为0.86,并以此为基础,对多种操作负荷条件下的氧煤比进行了优化。
In order to provide technical support for Shell gasifier of Datang Duolun coal to olefin project,a balance model of Shell pulver-ized coal gasification was established based on Gibbs free energy minimization method using Aspen Plus according to the characteristics ofgasification reactions being close to equilibrium at the condition of high temperature and high carbon conversion rate. Through limitation ofmain reactions equilibrium and heat loss modification,the simulation result was consistent with the actual data. The influencing factors ongasification performance was studied with the established model in the paper,such as carbon conversion rate,carrier gas type,oxygen-coalratio. The results showed that the effective gas increased with the increase of carbon conversion rate. Whlie under constant gas flow,carriergas CO2 was beneficial to produce more effective gas comparing with carrier gas N2. Meanwhile,the effective gas firstly increased,then de-creased with the increase of oxygen-coal ratio. The optimal value of oxygen-coal ratio was 0. 86. Furthermore,optimal oxygen-coal ratiowas also concluded at different operation loads.
出处
《洁净煤技术》
CAS
2015年第6期72-75,90,共5页
Clean Coal Technology
关键词
ASPEN
PLUS
粉煤气化
模拟
氧煤比
优化
Aspen Plus
pulverized coal gasification
simulation
oxygen-coal ratio
optimization
