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Conventional two-drum marine boilers much used today have many generating tubes, so called main tube bank, where the heat is absorbed by convectional heat transfer. The vibration problems of these tubes, however, should become much more serious matters as the marine boiler become larger. Therefore if we could cut off all these convectional generating tubes and the energy should be absorbed at the economizer parts, it is possible to design such a boiler as permits evaporation at its economizer. In this paper, steaming economizer feasibility has been studied within the limits of the standard design conditions of conventional marine boilers and an investigation has been made about the effects of a steaming economizer upon the responses of pressure and water level in the steam drum, comparing with the conventional type boilers. An experiment was carried out with the steaming economizer type boiler installed for turbine test in workshop, and the results of the experiment have been studied for comparison with theoretical analysis. is. As a result the steaming economizer will present no operating problem and the following have been found. 1. The outlet steam quality of a steaming economizer is less than 25 percent, within the limits of the standard design condition of conventional type marine boilers. The response of steam drum pressure and water level, therefore, are not very different from those of the conventional type boilers, and the partial modification of the analysis for the conventional type boiler makes it possible to analyze and explain relatively well about the dynamic response obtained from the experiments. 2. The fluctuations of water level, however, are smaller in the case of steaming economizer for reasons such as its smaller volume of a boiler with two-phase flow region and possibility of its design at a high void fraction. 3. The pressure response in the steaming economizer type boiler is faster than the conventional one, because the heat quantity in the evaporating tubes is much reduced. 4. The equation to give pressure response can be most suitably arranged on the basis of evaporation in which the heat quantity absorbed at the steaming economizer is as well taken into consideration.
公益社団法人日本マリンエンジニアリング学会の論文

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