Development of a modular software system for the dynamic simulation of coal conversion plants. Quarterly report
The variable-order, variable-step size integration algorithm of C. W. Gear as implemented by A. C. Hindmarsh has been installed as the first-line temporal integrator of the DSS/2 dynamic simulation code. This algorithm is implicit for stiff systems, and the implementation by Hindmarsh is based on a banded specification of the ODE system Jacobian matrix. Several options of the integrator may easily be called, but the diagonal approximation (Hindmarsh MF = 23) has been implemented within DSS/2 as integrators 15 and 16 (integrators 1 to 14 are classical Runge Kutta algorithms). The diagonal approximation has been used successfully on a series of test problems, and then applied to the methanation section simulation consisting of 126 ODEs. The results of this simulation are discussed in some detail. The physical properties package was received from the Purdue University Group and was modified, as required, to be implemented on the Lehigh CDC computer. The data base alone was tested successfully with the steady-state methanation simulation. Results were identical with those utilizing the special purpose package built into the methanator model. The data base, data-loading subroutine, and all the subroutines associated with heat capacity, heat of reaction, and chemical equilibrium constant were tested successfully with the steady-state methanation simulation. The results were similar to those using the built-in, ideal-gas-thermodynamics, special-purpose package. Computation time was longer, but that is to be expected from a general-purpose package.
- Research Organization:
- Lehigh Univ., Bethlehem, Pa. (USA)
- DOE Contract Number:
- EX-76-C-01-2338
- OSTI ID:
- 5295132
- Report Number(s):
- FE-2338-6
- Country of Publication:
- United States
- Language:
- English
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Development of a modular software system for the dynamic simulation of coal conversion plants. Annual report, June 1, 1976--June 30, 1977
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