深冷液体存贮与输送的实现讲解.ppt

Cryogenic Storage and DeliveryWhy it Works深冷液体存贮与输送的实现;Overview概述;What a storage Tanks Does贮罐可以做到;Understanding a Liquefied Gas理解液化气体;Intuitive Material Properties物质特性参数;Heat (Energy) Property能量参数;Page *;Page *;Page *;Page *;水的蒸发过程;Page *;Page *;Page *;Page *;Page *;PVT/PET Surface压力/体积（能量）/温度;The most critical area of the surface is the vapor dome. In this region we define the transition from liquid to gas.P-T曲线中关键区域是饱和区域（饱和液相线及饱和汽相线以下），此区域内液体 汽化为气体。 Above the dome, the fluid acts in a predictable manner and follows a linear relationship between pressure and density.曲线以上，流体在压力和密度之间存在线性关系 Pure liquid is essentially incompressible due to pressure, yet its density will change with increasing energy纯液体是不可压缩的，但随着能量的变化它的密度会产生变化。 ;Saturation/Equilibrium饱和/平衡;Saturation饱和;Stores the Liquid, keeping it cold液体存贮及保温;Allows for Refilling重新充装;Maintains Pressure压力保持;PB Circuit增压回路;Allows for Level Measurement液位测量;Allows for Level Measurement液位测量;Allows for Withdrawal Liquid Applications液体使用;To maintain sub-cool, a PB system is employed. The amount of flow through he PB is very small. The liquid through the PB is expanded from the liquid density to the vapor density. Typically the PB flow rate only needs to be about 5% of the liquid flow rate from the tank.使用增压系统以维持过冷。通过增压系统的流量极小，它从液体膨胀为气体。一般而言通过增压系统的流量仅为液体使用流量的5% A thermo-Siphon tank maintains sub-cool at the inlet of the pump by continuously flowing cold liquid from the bottom of the tank across the pump inlet and back to the bottom of the tank. This flow is induced by the inefficiency heat of the pump. As the heat warms the cold liquid, its density is reduced. This difference in density creates a small pressure difference and a convective flow. As long as the convective flow exceeds the pump speed, the tanks will keep a small amount of sub cool on the liquid from the liquid head of the tank. If the pump speed greatly exceeds this convective flow, a PB system may need to be employed.热虹吸罐通过不断地从罐底部抽取冷的液体通过泵入口并回