Abstract
Secure and cost-effective power generation has become very important
nowdays. Care must be taken while designing and operating modern steam
power plants. There are regulations such as German boiler regulations
(Technische Regeln für Dampfkessel 301) or European Standards that guide
the user how to operate the steam power plants. However, those regulations
are based on the quasi-steady state assumption and one dimensional
temperature distribution in the entire element. This simplifications may
not guarantee that the heating and cooling operations are conducted in the
most efficient way. Thus, it was important to find an improved method that
can allow to establish optimum parameters for heating and cooling
operations. The optimum parameters should guarantee that the maximum total
stresses in the construction element are in the allowable limits and the
entire process is conducted in the shortest time. This paper summarizes
mathematical descriptions how to optimize shut down process of power block
devices. The optimization formulation is based on the assumption that the
maximum total stresses in the whole construction element should be kept
within allowable limits during cooling operation. Additionally, the
operation should be processed in the shortest time possible.
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