Use of Mixed Integer Programming to Investigate Optimum Running Conditions for a Thermal Power Station and Possible Extension to Capacity

Cavalieri, Federico J.; Roversi, Alice; Ruggeri, Remigio

doi:10.1057/jors.1971.56

Cited by 13 publications

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The effect of steam temperature on the economics of a cogeneration power plant

Ham

Douglas

Fulford³

1988

Can J Chem Eng

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Using steady-state simulation, we have evaluated the effect of boiler superheat and reheat temperatures on the economics of the utility section of a Bayer Alumina Plant. These economics were compared with those of a steam plant which purchased power.Under this study's nominal economic conditions, producing steam and purchasing electricity was the cheaper option. A sensitivity analysis showed that the cogeneration plant became the better choice when the local cost of electricity rose above 10C/kWh. The plant economics improved monotonically with superheat temperature as did the thermo-dynamic efficiency. However, for reheat, the plant economics did not improve monotonically with temperature even though the thermodynamic eficiency did; thus improvement in the thermodynamic efficiency does not always yield improved economics.Nous awns evalue a I'aide d'une simulation en regime permanent I'effet des tempkratures de rkchauffement et de surchauffement d'une chaudiere sur les coats de I'installation des utilitis d'une usine d'alurnine Bayer. Ces coiits ont ete compares a ceux d'une centrale thermique oh I'tlectricite est achetee.Dans les conditions economiques considerees dans I'etude, I'option la meilleure marche consiste a produire de la chaleur et a acheter I'electricite. Une analyse de la sensibilitt montre que la centrale a cogeneration s'avere un meilleur choix lorsque le coat local de I'electricitk depasse 10C/kWh. Les coats de cette centrale s'ameliorent de maniere monotone avec la temperature de surchauffement ainsi que I'efficacite thermodynamique. Neanmoins, pour le rechauffement. les coats ne s'ameliorent pas de maniere monotone avec la tempkrature; I'amelioration dans I'efficacite thermodynamique ne permet donc pas toujours de meilleurs coats.

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