Development of a Modular Software System for the Dynamic Simulation of Coal Conversion Plants. Quarterly Report,April--June 1978.

摘要

Development of the general DSS/2code continued in three directions: (1) a manual was completed for the application of DSS/2to partial differential equations (PDEs) in cylindrical and spherical coordinates, (2) alternative methods for approximating the first-order spatial derivatives in PDEs describing flow-through systems, e.g.,tubular reactors,heat exchangers have been programmed and given a preliminary test,and (3) the Harwell and Yale sparse matrix codes are being implemented on the Lehigh computer in case an implicit integrator based on sparse matrix methods is later required. New coding has been added to the methanator model to readjust the reaction conversions if one or more of the reactants are consumed in a reactor. The new steady-state condition was confirmed to be accurate by an independent program. Simulation of the hydrogen plant has been initiated. The first unit to be modeled is the steam reformer in which reactions are limited not by kinetics but by heat transfer. A dynamic model of a fired steam generator driving three steam turbines is being tested. The centrifugal compressors have been selected,and their static configuration and parameters have been specified;but, a dynamic model has not yet been formulated. The pyrolyzer model has been coded and successfully run. The model includes seven pyrolysis reactions accounting for the formation of H sub 2 ,CO,CO sub 2 , H sub 2 O,CH sub 4 , C sub 2+ ,and oil. The thermodynamic section of the hydrotreator was expanded to include the heats of reaction for heteroatom removal and for hydrocracking. (ERA citation 04:025199)