ABSTRACT
The "large-size" steam generators are defined as the main steam generators installed in fossil fueled thermal electric power plants or in large industrial plants devoted to a mixed production of electric power and technologic steam. The wide range of modern steam generators for an electric power plant is from 75 to 1300 MW. The industrial plants only use steam generators having lower power, from 50 MW to 160 MW. The need to realize the large-size steam generator has been due to the wish to lower the cost of electric power. In fact, with the increase of the total power required for a power plant, it has been found to be less costly to build up the same with a few large units than with a lot of small units, because of the less total dimension and exposed surface. Furthermore, the large-size steam generators allow for the achievement of higher efficiencies, from 94 to 95 percent.
