常减压装置的先进控制? THE USE OF FIRST-PRINCIPLES INFERENCE MODELS FOR CRUDE SWITCHING CONTROL Crude units (CDU) advance process control (APC) is one of the most lucrative refinery control application, and it would have been even more profitable if not hindered by the performance of such controllers during crude switch disturbances. If a CDU APC application cannot work during crude switches – economic penalties ensue: • Throughput reduction • Product downgrading • Occasional pump cavitation and other equipment problems Why then are many CDU control applications turned off during crude switches? To control the unit during crude switches the APC must have a reliable inferential package that would be robust enough to work through the switch. Most inferential packages rely on regression analysis of steady state data. Such statistical packages have reliability problems even at steady state, and dynamically they are simply not designed to cope with the crude switch disturbance. Appendix A Provides more information about the draw backs of regression analyses. This paper describes how Petronas has successfully integrated crude switch capability into their CDU APC application by using first principles inferential modeling.查看更多0个回答 . 3人已关注