Study And Modellingfor ASU Of IGCC Plant

ASU, especially the configuration between the ASU and gas turbine has great impact, which concentrates on the power consumption by the ASU, on the IGCC power output, overall efficiency and the net cost of power generation of the IGCC plant. Therefore, it is significant to make a study on the relationship between the ASU and gas turbine and the factors which influence the power consumption by the ASU.Besides, the dynamical characteristics of the ASU also have great influence on those of the overall IGCC plant. It's long start-up time and off-design regulation time have great restriction on flexibility and reliability of the overall plant. So the study on the dynamical characteristics of the ASU is important to the dynamical characteristics and control system of the overall IGCC plant.In this article, the law of power consumption by the ASU, the factors affecting the consumption and the dynamical characteristics of the ASU will be profoundly discussed by means of theoretical study and simulation as well.In the first place, with the comparison among several sorts of configurations between the ASU and gas turbine, EP-ASU is theoretically proved to have better overall IGCC power output, overall efficiency and net cost of power generation than LP-ASU. Furthermore, the pressure ratio of the ASU and the temperature diffenrence of the main reboiler/condencer are found to be the two key factors which affect the power consumption by the ASU.In the second place, based on the ASU of Buggenum IGCC plant in Netherlands, both static and dynamical model for distillation tower of the ASU are created and some valuable conclusions are gained as well.Finally, a compartmental simplified model is created for distillation tower of the ASU, in order to reduce the simulation time and increase the simulation efficiency. The new model will be helpful to the further simulation and on-line optimal control for the ASU of the IGCC plant.