Evaluation and modification of ASPEN fixed-bed gasifier models for inclusion in an integrated gasification combined-cycle power plant simulation

Abstract

Several Advanced System for Process Engineering (ASPEN) fixed-bed gasifier models have been evaluated to determine which is the most suitable model for use in an integrated gasification combined-cycle (IGCC) power plant simulation. Four existing ASPEN models were considered: RGAS, a dry ash gasifier model developed by Halcon/Scientific Design Company; USRWEN, the WEN II dry ash gasifier model originally developed by C.Y. Wen at West Virginia University; the slagging gasifier model developed by Massachusetts Institute of Technology (MIT) and based on Continental Oil Company's (CONOCO) design study for the proposed Pipeline Demonstration Plant; and the ORNL dry ash gasifier model developed by Oak Ridge National Laboratory for the simulation of the Tri-States Indirect Liquefaction Process. Because none of the models studied were suitable in their present form for inclusion in an IGCC power plant simulation, the SLAGGER model was developed by making significant modifications to the MIT model. The major problems with the existing ASPEN models were most often inaccurate material and energy balances, limitations of coal type, or long run times. The SLAGGER model includes simplifications and improvements over the MIT model, runs quickly (less than 30 seconds of computer time on a VAX-11/780), and gives more accurate mass andmore » energy balances.« less