Transient modeling and analysis of advanced Pressurized Fluidized Bed Combustion (PFBC) Systems is a research area that is currently under investigation by the United States Department of Energy's Federal Energy Technology Center (FETC). Theobject of the effort is to identify key operating parameters that affect plant performance and then quantify the basic response of major sub-systems to changes in operating conditions. PC-TRAX{sup}(TM), a commercially available dynamic software program,was chosen and applied in this modeling and analysis effort. PC-TRAX's software system includes a library of modular components that describe the dynamic behavior of standard power plant equipment such as pumps, compressors, and gas/steam turbines. Thesemodules are linked together, such that thermodynamic and hydrodynamic information flows between the individual modules to emulate the overall plant configuration. Customized dynamic models have been developed using Advanced Continuous Simulation Language(ACSL) for non-standard components such as carbonizers, fluidized-bed heat exchangers (FBHE), fluidized-bed combustors, solids coolers, and other near-term components found in PFBC power plant systems. These customized ACSL-based modules have beeninterfaced with the standard TRAX code and used for on-line transient analysis of complete power plant configurations.This paper describes the development of a series of TRAX-based transient models of advanced PFBC power plants. These power plants burn coal or other suitable fuel in a PFBC, and the high temperature flue gas supports low-Btu fuel gas or natural gascombustion in a gas turbine topping combustor. When it is utilized, the low-Btu fuel gas is produced in a bubbling bed carbonizer. High temperature, high pressure combustion products exiting the topping combustor are expanded in a modified gas turbine togenerate electrical power. Waste heat from the system is used to raise and superheat steam for a reheat steam turbine bottoming cycle that generates additional electrical power. Basic contro1'instrumentation models were developed and modeled in PC-TRAXand used to investigate off-design plant performance. System performance for various transient conditions and control philosophies was studied.
展开▼
