Influence of structural and operating parameters on thermal and gas dynamic characteristics of the vessel's compact exhaust boiler
The work is devoted to the continuation of the research of the new design vessel's compact exhaust boiler. The research is carried out in order to study the influence of the operating and structural parameters of the developed exhaust boiler on its main operational indicators. The research stage described in the article includes a description of the preparation process, results and analysis of the results of the screening experiment according to the Plakett-Berman plan, conducted using a previously developed and tested numerical model of heat transfer and gas movement in the channels of a compact exhaust boiler. It explains how the analysis' data is selected from the resulting set. The results of the analysis of variance with a confidence probability of 0.95 suggest that all the selected factors are significant. The assessment of the factors' significance by the determination coefficient determines the level of relationship between each factor and the response, and the curves of the graphs of the "factor-response" dependencies qualitatively confirm the adequacy of these dependencies. The study showed that the parameters of the exhaust boiler, which can influence its operational characteristics, are chosen correctly, which allows to start preparing for an optimization experiment. The analysis of the screening experiment data confirmed the correspondence of the simulated gas-dynamic and thermal processes to the physical processes occurring in the exhaust boiler. It turned out that of all the selected factors, the operating parameter (change in the coolant velocity) has the greatest influence on the pressure drop in the exhaust boiler, and the geometric parameter (change in the length of the heat exchange section) has the greatest influence on the output temperature of the coolant.