ASPEN Simulations of Fluidized-Bed and Entrained-Flow Integrated Gasification Combined-Cycle Power Plants

摘要

A fluidized-bed, integrated gasification combined-cycle (IGCC) power plant simulation was developed by METC using the Advanced System for Process Engineering (ASPEN) process simulator. The ASPEN simulation is based on a conceptual design of a 570 megawatt (MW) IGCC plant using Kellogg-Rust-Westinghouse (KRW) ash agglomerating pressurized fluid-bed gasifiers and conventional cold gas cleanup processes. The conceptual design was completed by Bechtel as part of the Design of Advanced Fossil Fuel Systems (DAFFS) study (Bechtel 1983). In this process, Illinois No. 6 coal is converted into a medium-Btu gas to fuel a combined-cycle power generation system. The system employs advanced gas turbines having a firing temperature of 2150 deg F. Heat recovery steam generators (HRSGs) produce high pressure steam for expansion through steam turbines. ASPEN performs a steady-state computer simulation of this process. The simulation flowsheet contains 83 unit operation blocks (models of unit operations, such as pumps, reactors, and compressors), plus user routines to calculate ash enthalpy and to decompose coal. The KRW-IGCC simulation was developed to provide accurate mass and energy balances and to track major environmental species (SOx, NOx, and particulates). This level of detail is appropriate for scoping, sensitivity, and trade-off studies. Operating conditions for any of the unit operation blocks can be modified to conduct sensitivity studies. Simulation results agree well with the Bechtel study. A study was carried out to determine how the overall plant efficiency would be affected by changes in the gas turbine firing temperature. 6 refs., 19 figs., 4 tabs. (ERA citation 10:048027)