Abstract: When load reduced to a certain degree,compressor will produce dramatic surge phenomena.This will seriously damage the machine and lead to a serious consequence.In order to avoid the compressor surge of fluid catalytic cracking unit,high-power compressor is usually chosed to make its stable work,and the same time the problem of high fixed investment and lots of operating cost will bring.Active control can expand the stable work region of the compressor,and make compressor work in high performance areas,so this paper chooses a small-power compressor to work.The result of it maybe the compressor can not work in the steady areas in most time,but through the active control function the idea not only can make the compressor work in steadily,but also achieve the purpose of reducing the investment cost and operating cost.It respectively describes the control scheme and control algorithm. Finally,it proves the effectiveness of the proposed scheme by simulation of the actual cases.

Key words: FCCU, compressor, surging, active control

摘要： 压缩机工作时,当负荷降低到一定程度时,会产生剧烈的喘振现象。喘振会严重损坏机体,产生严重后果。催化裂化装置中,为避免压缩机的喘振,通常采用大功率压缩机使其稳定工作,常带来固定投资高、操作费用大等问题。通过采用主动控制,可以扩大压缩机的稳定工作范围,并使压缩机工作在高性能区,因此本文在选型时选择一个比实际较小的压缩机来实现压缩机的工作,虽然其结果可能使压缩机大部分时间工作于喘振区,但通过主动控制作用可以使其稳定工作,同时还可以达到减小压缩机的投资费用和操作费用的目的。文中分别对控制方案、控制算法进行了详细的描述,最后通过实际案例验证了该方案的可行性和有效性。

关键词: 催化裂化, 压缩机, 喘振, 主动控制