液化ガス運搬船の加圧揚荷中の凝縮現象について

概要

論文の詳細を見る
Unloading of the liquefied gas of helium and hydrogen is done by pressurizing the tank without utilizing the submerged pump due to the structural, material and electrical problems under the cryogenic temperature. Since the spherical tank of MOSS type LNGC has a function of pressure vessel, pressure unloading could be adopted as an effective means of an emergency discharge in case of pump failure. In this procedure the condensation of vapor will consequently occur on the surface of dry tank wall and liquid/vapor interface due to the positive difference of temperature induced by the high supplied vapor pressure and low suturated vapor pressure corresponding to the surface temperature. Designer and operator of cargo handling should take this phenomena into consideration when designing and before entering into operation of cargo unloading. In this paper author induced the analytical solution of condensation on the dry surface and wet surface from the view point of heat transfer of vapor/liquid interface and vaper/wall interface and R-11 experimental test was done for the evaluation of the theory and the actual configuration of wall surface properties. The theory has applied to the spherical tank of LNGC and LHGC and the practical figures were indicated for the design and the operation purpose.
社団法人日本船舶海洋工学会の論文
1990-03-15