Abstract
In the present work, in order to investigate and solve the issue associated with the circulation ratio (CR) for naturally assisted utility boilers, analysis of the boiler riser downcomer circuit has been performed for the whole range of operating pressure that supports natural circulation. This is done by developing a two phase flow model suitable for thermosyphon circuit analysis. The model is well validated with available numerical and experimental data for thermosyphon loop and practical boiler. In compliance with the industrial need, the tubes of boiler system are chosen based on the ASME boiler code. A set of case study of practical boilers has been conducted to determine the minimum possible safe circulation ratio for each separate case. Finally the computed circulation ratios are plotted against the operating pressure ranging from 5 to 180 bar. The trend of variation is discussed along with the discussion of safe operating range, considering the issue of vulnerability of tube overheating. The overheating of tube wall is correlated with the critical circulation ratio. The range of minimum safe CR is identified for low, medium and high operating pressure natural circulation boilers.
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