Abstract
In cogeneration and combined cycle plants, the presence of a by-pass stack has a great importance since it allows the modulation of heat-to-power generation to follow variable daily demand and thus the optimal management of the heat and power production. Hence, among the various aspects that have to be analysed in a plant design, the exhaust gas stack design can represent a critical aspect, in particular when a by-pass stack is present, since it may influence the entire system working condition. To properly take into account the large number of the different requirements (economic, structural, geometrical, acoustic, etc.) which enter in a stack design, a multidisciplinary analysis involving CAD/CFD/FEM integrated approaches can be adopted in order to obtain an optimally designed stack system. In this paper, the design of the exhaust gas stack in a cogeneration plant is performed numerically. In the considered plant, a single stack, in which the gases coming from both the utility heat exchangers and the by-pass at the gas turbine exit are mixed, is used. Different design solutions of the by-pass system are simulated through a three-dimensional integrated numerical code and the results discussed in detail.
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