LNG储罐首船预冷

1、Fujian LNG Cooldown Presentation福建液化天然气冷却演示福建液化天然气冷却演示Option 4.方案方案4Cooldown Unloading System & T-0202冷却卸载系统冷却卸载系统&T-0202Cooldown Steps冷却步骤冷却步骤1. Displace Nitrogen from T-0202 & Unloading System Piping before cooldown冷却前将氮气抽离出T-0202和卸载系统管道2. Cooldown Unloading and T-0202 only仅冷却卸载系统和T-02023. Displac

2、e LNG from unloading into T-0202将液化天然气从卸载系统运至T-02024. Re-cooldown the facility with a second ship用另一艘船只再次冷却设备Cooldown Description冷却说明冷却说明nDisplace the Nitrogen from T-0202 with vapor from the ship vaporizer用船只汽化器中的蒸汽置换T-0202中的氮气nCooldown the Unloading and LP sendout systems with cold vapor from ship

3、用船上的冷蒸汽冷却卸载和LP输出系统nCooldown T-0202 until design temperature将T-0202冷却至设计温度nUnload all cargo into T-0202 将船上所有气体卸载到T-0202nShip departs船只驶离nRecover unloading system LNG to T-0202将卸载系统中的液化天然气运回T-0202Preparation准备阶段准备阶段nA valve lineup will be done for each step安排每一步的阀门开关顺序nMonitoring of all cooldown inst

4、ruments will be on the DCS trends由集散控制系统监视所有的冷却设备nMonitoring of the unloading lines movement will be by a team of engineers将由一队工程师监视卸载管线作业nCommunication with the ship will be from the CBI focal point in the CCR与船只的联系将由CBI中央控制室精英人员执行Step 1: Nitrogen Displacement步骤步骤1：氮气置换：氮气置换nValve line up to direct

5、 the ship vapor to T-0202 bottom fill line.执行阀门开关顺序，引导船上蒸汽进入T-0202底部的充液管线nDirect the Nitrogen through the BOG system to the Flare Stack引导氮气通过BOG系统进入火炬塔nControl the Tank pressure on 06-PV-0004控制06-PV-0004上的储罐压力nNitrogen target is 30%所需氮气量为30nEstimated time for 12 hrs估计所需时间为12个小时Step 2: Unloading Syst

6、em Cooldown步骤步骤2：卸载系统冷却：卸载系统冷却nVapor Cooldown of the unloading system卸载系统的蒸汽冷却 nCooldown will be controlled by the ship on instructions from the DCS operator冷却作业由船只根据集散控制系统操作员的指令进行控制nCooldown rate will be 10 to 20 deg / hr冷却速率为10-20/小时nCooldown can start during the Nitrogen displacement from T-0202在

7、氮气抽离T-0202的期间可以开始冷却nTarget temperature -100C at T-0202 riser T-0202立管目标温度为-100nTime for this step.16 hrs.这一步所需时间为16个小时Step 3: Filling the Unloading Lines步骤步骤3：卸载管线充液：卸载管线充液nLNG can be introduced to the unloading arm when -100C is reached at T-0202 riser on 02-TIT-2021 / 02-TIT-2022当02-TIT-2021/02-TI

8、T-2022上的T-0202立管达到-100时，可以将液化天然气装入卸载臂nTwo ship stripping pumps can be started to fill the unloading system.启动两个船只扫舱泵对卸载系统进行充液nApproximate volume of LNG required 850m3 所需液化天然气容积约为850m3nFilling rate 150 m3/hr from ship充液速率为每小时150m3nEstimated time for this step is. 10 hrs.这一步所需时间为10个小时Step 4: LNG Coold

9、own of T-0202步骤步骤4：T-0202的液化天然气冷却的液化天然气冷却nWhen LNG is detected at PIT on T-2020 riser the 02-HV-2002B on the tank must be closed.在T-2020立管上的PIT检测到液化天然气时必须关闭储罐上的02-HV-2002BnOne stripping pump stopped and 02-HV-2001 Spray valve opened停止一台扫舱泵，打开02-HV-2001喷射阀nSpray cooling of the tank can begin at 3 to

10、5C /hr.以每小时3到5的速度开始对储罐进行喷淋冷却nEstimated cooldown time is 50 hrs.估计冷却时间为50个小时 nCooldown is finished when50 mm of LNG is measured on tank floor储罐底上的液化天然气达到50mm时结束冷却.Step 5 Tank T-0202 Filling步骤步骤5：T-0202充液充液nFilling of the tank can begin when all floor thermocouple are reading -156C and at 50mm level当所

11、有的底面热电偶读数为-156并达到50mm时可以开始储罐充液.nRequest the ship to start a cargo pump要求船只启动装卸油泵.nPumps can be started to the maximum limit of two unloading arms (8000m3/hr).可以以两个卸载臂的最大速率（8000m3/hr）运转油泵.nEstimated time for this step16 hrs. (depends on ship cargo size).估计所需时间为16个小时（取决于船只液量）Ship Departure船只驶离船只驶离nWhe

12、n cargo transfer is complete, the unloading arms can be disconnected following vendor procedure.充液完成后，可以根据供应商程序拆下卸载臂.nThe V-0102 Drain Drum emptied.排空V-0102干燥滚筒.nThe Unloading system LNG allowed to weather off.卸载系统使液化天然气不受天气影响.nThe unloading system purged by Nitrogen.用氮气吹扫卸载系统.Fig 1 Cooldown Diag. Overview图图1 冷却图总览冷却图总览Fig: 2 Nitrogen Displacement图图2：氮气置换：氮气置换LNG Vapor Cooldown液化天然气蒸汽冷却液化天然气蒸汽冷却Filling Unloading System卸载系统充液卸载系统充液Cooldown of T-0202T-0202冷却冷却Filling T-0202T-0202充液充液Displacing LNG to T-020