A Study on Direct Carrying Type of Asphalt Tanker

点击翻译按钮获取中文摘要

In the case of ship loading very high temperature liquid (160℃-180℃) such as asphalt, the cargo tank is generally separated from the ship structures by slider supports and thermal insulation materials in order to permit the tank to expand freely and to prevent the heat to transfer to ship structures. In such a case, for example, a 749G/T small ship, the gross tonnage and the construction cost will increase greatly with a separated type tank. In this study, we investigate the feasibility to carry the high temperature liquid cargo with a double hull structure. In the double hull carrier, the cargo tank is integrated with the inner hull to form an integrated hold to carry the high temperature liquid cargo. The, temperature distribution of a hold tank model floating in the sea is measured as it is loaded with the high temperature transmitting oil Some scantlings of the model, such as the breadth of ballast tank, the height of double hull, etc., are taken as the, same as the design ship. The heat transfer among the fluids (transmitting medium, air, etc.) and tank hulls is calculated in the natural convection state. Then the temperature distribution of the model is evaluated by the heat conduction analysis of finite element method. In addition, the numerical results of the model are compared with the measure ones to verify the validity of the numerical analyses. Finally, the thermal stresses of the design ship are computed numerically based on the temperature distribution of the model.