BGL碎煤熔渣气化炉气化过程模拟

摘要

为进一步研究BGL碎煤熔渣气化技术的气化性能,探寻BGL气化炉的最佳操作参数,采用Aspen Plus工业系统流程模拟软件,遵循Gibbs自由能最小化方法以及反应平衡模型建立BGL气化炉模型;通过对3种不同煤种的气化模拟,对模型进行检验,结果表明:该模型与BGL气化炉的实际运行的结果吻合程度比较高,可应用于一些反应机理复杂的气化工艺的化学和热力学平衡计算,并研究了不同操作参数对BGL气化炉气化性能的影响.以安徽淮北烟煤为例,模拟不同氧气预热温度、氧煤比及汽煤比对出口有效产气率的影响.模拟结果表明:出口产气率随着氧煤比与氧气预热温度的升高而增加,而氧煤比增加到一个特定值时则下降,在氧煤比(质量比)为0.36时,有效产气率最高;产气率随汽煤比升高而下降.%To further study the gasification performance of BGL gasification technology,the optimal operating parameters of BGL gasifier were explored.Based on Aspen Plus,the BGL gasifier gasification model was established by using the reaction balance model and the minimizing method of the Gibbs free energy ; and the model established was tested through the simulation for three kinds of coal.The results show that the gasifier model is in much good agreement with the actual running of BGL gasifier,and can be applied to the chemical and thermodynamic equilibrium calculation of some complex gasification processes.A series of calculations were carried out to reveal the effects of different operation parameters on the performance of gasifier.Taking Huaibei bituminous coal as example,the different oxygen preheating temperature,oxygen/coal mass ratio,steam/coal mass ratio were simulated to reveal the effects on the coal gas composition at exit of gasifier.The results show that the gas production rate increases with the rise of oxygen/coal mass ratio and oxygen preheating temperature,and drops at a specific value of oxygen/coal mass ratio,which achieves the highest when the oxygen/coal mass ratio is 0.36 ; the gas production rate decreases with the increase of steam/coal mass ratio.