专业外语第九组.ppt

Mechanisms of Evaporation Losses Group 10 Class 7 Catalog Introduction Words Phrases Important Sentences Method of reducing losses Summary of the article What is Evaporation? During the evaporation process, water turns to a vapor. Introduction of the Evaporation 1701年，普鲁士国王腓特烈一世想拥有一件珍品 ——一个壁上嵌满琥珀的房间 Variation of temperature inside the tank Evaporation loss Evaporation losses 蒸发损耗 Evaporation [??v?p??re??n] n.蒸发，发散;消失;汽化;蒸发法 Breathing losses(standing storages losses) 静止储存损耗/呼吸损耗 Filling and emptying operations 收发油作业 Emission sources 发散源 emission [??m???n] n.排放，辐射;排放物，散发物（尤指气体）;（书刊）发行，发布（通知） Utilization rate of the tank 储罐利用率 utilization[?jut?la??ze??n] n.利用，使用，效用 Words Phrases Atmospheric conditions 大气条件 atmospheric [??tm??sf?r?k, ] adj 大气的;大气引起的 Vapor balancing 蒸汽平衡 Gasoline station 加油站 be expelled from 排出；被驱逐 Be subjected to 遭受.受到…控制 Vapor recovery systems 蒸汽回收系统 Words Phrases Important Sentences External and internal floating-roof tanks are emission sources because of evaporative losses that occur result from standing storage and withdrawal of liquid from the tank.（P167,paragraph 2） 由于储罐储存和发油期间产生蒸发损耗，故内、外浮顶罐也是发散源。 emission sources 发散源 result from 产生于…， 由…引起; Evaporative loss during empting occurs when air drawn into the tank during liquid removal becomes saturated with organic vapor and expands, thus exceeding the capacity of the vapor space.(3.5.1.1) 在发油期间，随液体流出，空气被抽入罐内， 空气为油品蒸汽所饱和以及气体膨胀，超过了 蒸汽空间容纳能力时就产生蒸发损耗。 Important Sentences The control efficiency of this method ranges from 60 to 99 percent, depending on the type of roof and seals installed and on the type of organic liquid stored. (3.5.1.1) 根据所安装内浮顶和密封以及所处油品的类型，这种方法的控制效率在60%-99%范围内。