LNG儲罐首船預冷

1、Fujian LNG Cooldown Presentation福建液化天然氣冷卻演示福建液化天然氣冷卻演示Option 4.方案方案4Cooldown Unloading System & T-0202冷卻卸載系統(tǒng)冷卻卸載系統(tǒng)&T-0202Cooldown Steps冷卻步驟冷卻步驟1. Displace Nitrogen from T-0202 & Unloading System Piping before cooldown冷卻前將氮氣抽離出T-0202和卸載系統(tǒng)管道2. Cooldown Unloading and T-0202 only僅冷卻卸載系統(tǒng)和T-02023. Displac

2、e LNG from unloading into T-0202將液化天然氣從卸載系統(tǒng)運至T-02024. Re-cooldown the facility with a second ship用另一艘船只再次冷卻設備Cooldown Description冷卻說明冷卻說明nDisplace the Nitrogen from T-0202 with vapor from the ship vaporizer用船只汽化器中的蒸汽置換T-0202中的氮氣nCooldown the Unloading and LP sendout systems with cold vapor from ship

3、用船上的冷蒸汽冷卻卸載和LP輸出系統(tǒng)nCooldown T-0202 until design temperature將T-0202冷卻至設計溫度nUnload all cargo into T-0202 將船上所有氣體卸載到T-0202nShip departs船只駛離nRecover unloading system LNG to T-0202將卸載系統(tǒng)中的液化天然氣運回T-0202Preparation準備階段準備階段nA valve lineup will be done for each step安排每一步的閥門開關順序nMonitoring of all cooldown inst

4、ruments will be on the DCS trends由集散控制系統(tǒng)監(jiān)視所有的冷卻設備nMonitoring of the unloading lines movement will be by a team of engineers將由一隊工程師監(jiān)視卸載管線作業(yè)nCommunication with the ship will be from the CBI focal point in the CCR與船只的聯(lián)系將由CBI中央控制室精英人員執(zhí)行Step 1: Nitrogen Displacement步驟步驟1：氮氣置換：氮氣置換nValve line up to direct

5、 the ship vapor to T-0202 bottom fill line.執(zhí)行閥門開關順序，引導船上蒸汽進入T-0202底部的充液管線nDirect the Nitrogen through the BOG system to the Flare Stack引導氮氣通過BOG系統(tǒng)進入火炬塔nControl the Tank pressure on 06-PV-0004控制06-PV-0004上的儲罐壓力nNitrogen target is 30%所需氮氣量為30nEstimated time for 12 hrs估計所需時間為12個小時Step 2: Unloading Syst

6、em Cooldown步驟步驟2：卸載系統(tǒng)冷卻：卸載系統(tǒng)冷卻nVapor Cooldown of the unloading system卸載系統(tǒng)的蒸汽冷卻 nCooldown will be controlled by the ship on instructions from the DCS operator冷卻作業(yè)由船只根據(jù)集散控制系統(tǒng)操作員的指令進行控制nCooldown rate will be 10 to 20 deg / hr冷卻速率為10-20/小時nCooldown can start during the Nitrogen displacement from T-0202在

7、氮氣抽離T-0202的期間可以開始冷卻nTarget temperature -100C at T-0202 riser T-0202立管目標溫度為-100nTime for this step.16 hrs.這一步所需時間為16個小時Step 3: Filling the Unloading Lines步驟步驟3：卸載管線充液：卸載管線充液nLNG can be introduced to the unloading arm when -100C is reached at T-0202 riser on 02-TIT-2021 / 02-TIT-2022當02-TIT-2021/02-TI

8、T-2022上的T-0202立管達到-100時，可以將液化天然氣裝入卸載臂nTwo ship stripping pumps can be started to fill the unloading system.啟動兩個船只掃艙泵對卸載系統(tǒng)進行充液nApproximate volume of LNG required 850m3 所需液化天然氣容積約為850m3nFilling rate 150 m3/hr from ship充液速率為每小時150m3nEstimated time for this step is. 10 hrs.這一步所需時間為10個小時Step 4: LNG Coold

9、own of T-0202步驟步驟4：T-0202的液化天然氣冷卻的液化天然氣冷卻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檢測到液化天然氣時必須關閉儲罐上的02-HV-2002BnOne stripping pump stopped and 02-HV-2001 Spray valve opened停止一臺掃艙泵，打開02-HV-2001噴射閥nSpray cooling of the tank can begin at 3 to

10、5C /hr.以每小時3到5的速度開始對儲罐進行噴淋冷卻nEstimated cooldown time is 50 hrs.估計冷卻時間為50個小時 nCooldown is finished when50 mm of LNG is measured on tank floor儲罐底上的液化天然氣達到50mm時結束冷卻.Step 5 Tank T-0202 Filling步驟步驟5：T-0202充液充液nFilling of the tank can begin when all floor thermocouple are reading -156C and at 50mm level當所

11、有的底面熱電偶讀數(shù)為-156并達到50mm時可以開始儲罐充液.nRequest the ship to start a cargo pump要求船只啟動裝卸油泵.nPumps can be started to the maximum limit of two unloading arms (8000m3/hr).可以以兩個卸載臂的最大速率（8000m3/hr）運轉(zhuǎn)油泵.nEstimated time for this step16 hrs. (depends on ship cargo size).估計所需時間為16個小時（取決于船只液量）Ship Departure船只駛離船只駛離nWhe

12、n cargo transfer is complete, the unloading arms can be disconnected following vendor procedure.充液完成后，可以根據(jù)供應商程序拆下卸載臂.nThe V-0102 Drain Drum emptied.排空V-0102干燥滾筒.nThe Unloading system LNG allowed to weather off.卸載系統(tǒng)使液化天然氣不受天氣影響.nThe unloading system purged by Nitrogen.用氮氣吹掃卸載系統(tǒng).Fig 1 Cooldown Diag. Overview圖圖1 冷卻圖總覽冷卻圖總覽Fig: 2 Nitrogen Displacement圖圖2：氮氣置換：氮氣置換LNG Vapor Cooldown液化天然氣蒸汽冷卻液化天然氣蒸汽冷卻Filling Unloading System卸載系統(tǒng)充液卸載系統(tǒng)充液Cooldown of T-0202T-0202冷卻冷卻Filling T-0202T-0202充液充液Displacing LNG to T-020