低沸点液体タンクの圧力上昇について
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概要
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After closing a tank which contains liquids having a low temperature boiling point, tank pressure increases gradually due to the formation of temperature stratification in the liquid below the surface corresponding to the heat energy transferred from an environment. This phenomena of temperature and pressure variation in a tank can be treated as a phase equilibrium of vapor and liquid at the interface based on a heat transmission. Since in this paper liquid is assumed to be governed by one main component (e.g. methane in case of LNG) and pressure varies only a small extent as high as two to three atms, dealing with a conception of fugacity is not necessary, and simple form of equation of state for a saturated liquid and an ideal gas law for vapor phase are adopted. Process of pressure increase was divided into two different phenomena of a rapid initial and a gradual steady pressure increase and heat transfer to the liquid phase were analitically classified into various components for both cases of fully and partially loaded conditions. Differential equations of heat transmission for tank wall, vapor and liquid were established and solved numerically by means of the finite difference equations of explicit form. Some of the heat transfer components which are difficult to get only through analysis were evaluated viewing the correlation with the data of an actual ship tank of LNG and a small experimental tank of R-11, and a good coincidence between measured and calculated figures was obtained.
- 社団法人日本船舶海洋工学会の論文
- 1989-03-15
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