Modeling And Simulation For A Texaco Coal Water Slurry Gasifier

The CCT (Cleaning Coal Technique) has been developed to a strategic degree naturally so as to save energy, to increase the efficiency of generating electricity and to solve the atmospheric pollution in China. TGP technique that is one of high-efficiency clean coal technique, not only has been widely used in chemical industry, but also was popularized in IGCC gradually. The process of Texaco coal water slurry gasification is a very complex physical and chemistry process; and the study of modeling and simulation for TGP has become a new type subject, which work has important value for fundamental study and engineering technique study.A large-scale Texaco coal water slurry gasifier is taken as study subject in this paper. Based on the analyzing of study status about modeling and simulation for Texaco gasifier in the domestic and international, a mathematical model for Texaco coal water slurry gasifier is established. Cell model is employed to divide the gasifier into many segments and the mass balance equation of eight gas components such as CO, CO2, H2, O2, N2, CH4, H2S, H2O, solid flow rate, carbon flow rate and total energy balance equation are set up respectively. More than eight heterogeneous and homogeneous kinetic chemical reactions that include the pyrolysis and combustion reactions of volatile, the combustion and gasification reaction of carbon, water gas reaction, are taken into account in detail. Thus the primary physical and chemical process of Texaco gasifier gasification can be comprehensive analyzed. Based on the established dynamic mathematical model, a dynamic simulation model has developed by using ACSL simulation tool. Firstly, the steady calculation for model is carried on. The calculation results are in accord with relative experiment data. and provide a basis for next simulation experiment. Based on the established dynamic simulation model, a series of dynamic simulation experiment have been done by using this simulation model, which include the simulation experiment of step disturbance about CWS density, disturbance the ratio of O2 and CO2 and so on. The simulation results current is correct. The analyzed results indicate that the established dynamic mathematical model for Texaco gasifier in this paper is accurate and credible, and proved that the simulation model is practical.This model is applicable to the basic study for Texaco coal water slurry technique, and to steady and dynamic performance study for Texaco gasification, and can provide aacademic reference for the design, operation, technics and parameter optimization study for a Texaco gasifier.