水煤浆气化装置扩能改造方案研究

A study of expansion and renovation scheme for coal water slurry gasification unit

为了解决宁夏能化醋酸装置的瓶颈,增加CO供给量,对气化装置的扩能改造方案进行了研究。采用Aspen Plus建立了全流程的水煤浆气化计算模型,获得了扩能后的物料及能量平衡数据,并在此基础上对气化装置的设备、管道、仪表进行了全面核算。核算结果表明,大部分设备、管道、仪表均能满足扩能要求,仅需要通过更换气化炉内件、更换真空泵、增加低压灰水泵及更换少部分仪表等改造措施即可满足扩能要求。改造方案实施后,气化装置实际有效气产量达到了225 600 m3/h,实现了改造的预期效果,既验证了设备、仪表核算的准确性,也验证了Aspen Plus全流程水煤浆气化模型的可靠性。

In order to overcome the bottleneck of Ningxia Energy and Chemical Corporation’s acetic acid plant and increase the supply of CO,the expansion revamping scheme for gasification unit is studied.The whole coal water slurry gasification process simulation model is established by using Aspen Plus software,and the material and energy balance data after expansion are obtained.Based on these data,the comprehensive accounting is performed on the facilities,pipelines and instruments of the gasification unit.The results show that most of the facilities,pipelines and instruments can meet the requirements of expansion.Only by replacing some internal parts of gasifier,replacing vacuum pump,adding a low-pressure ash pump and replacing a small number of instruments,the expansion requirements can be met.After the renovation scheme is implemented,the actual effective gas output of the gasification unit reaches 225 600 Nm3·h-1,achieving the expected effect of renovation.These achievements not only verify the accuracy of accounting on facilities and instruments,but also verify the reliability of Aspen Plus simulation model of coal water slurry gasification.