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  PSV Case Study °ü·Ã ÁúÀÇ µå¸³´Ï´Ù.
  ±Û¾´ÀÌ : ¿ÏÀüÃʺ¸ÀÓ¡¦   °íÀ¯ID : pwh303     ³¯Â¥ : 20-03-23 08:00     Á¶È¸ : 8231    
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°è¼ÓÇÏ¿© µé¾î¿À°Ô µÇ³×¿ä

PSV CalculationÀÛ¾÷À» ÇÏ´Â °úÁ¤¿¡¼­ Case¸¦ ¼³Á¤Çϴµ¥ ¾à°£ÀÇ ¾î·Á¿òÀÌ ÀÖ½À´Ï´Ù.

±Ã±ÝÇÑ Á¡Àº 1. power failure case¿Í cooling water failure case´Â º¸Åë µ¿½Ã¿¡ ¹ß»ýÇÏ´Â °ÍÀÎÁö¿ä?
2. Power failure°¡ ÀϾ °æ¿ì¸¦ º¸¸é Column¿¡¼­ reflux°¡ ÀÖ´Â °æ¿ì°¡ ÀÖ´øµ¥ P&ID»óÀ̳ª ÀåÄ¡¸¦ ºÁµµ Àü·Â¿¡ °üÇÑ »çÇ×Àº º¸ÀÌÁö ¾Ê´øµ¥ reflux°¡ ÀÖ´Â °æ¿ì´Â power failure°¡ ´ç¿¬È÷ °í·Á°¡ µÇ¾î¾ß ÇÏ´ÂÁö ¾Ë°í ½Í½À´Ï´Ù.

°¨»çÇÕ´Ï´Ù.

·ÎÁø bless20   20-03-23 09:04
¾È³çÇϼ¼¿ä. Áú¹®ÇϽŠºÎºÐ¿¡ ´ëÇØ ºÎÁ·ÇÏ°Ô³ª¸¶ ´äº¯µå¸³´Ï´Ù.

Q1. power failure case¿Í cooling water failure case´Â º¸Åë µ¿½Ã¿¡ ¹ß»ýÇÏ´Â °ÍÀÎÁö¿ä?\
A1. º¸ÅëÀº µ¿½Ã¿¡ ¹ß»ýÇÏ´Â °æ¿ì°¡ ¸¹Áö¸¸ ¹«Á¶°Ç µ¿½Ã¿¡ ¹ß»ýÇÏÁø ¾Ê½À´Ï´Ù.
    -> Pump trip¿¡ ÀÇÇÑ Cooling medium failureÀÇ °æ¿ì Power failure¿Í µ¿ÀϽà Çϱ⠾î·Á¿ï °Ì´Ï´Ù.
    -> PSVÀÇ LoadÀÇ °æ¿ìµµ µÎ°¡Áö Case°¡ ¹«Á¶°Ç °°Áø ¾Ê½À´Ï´Ù.
    -> Total or Partial power fail¿¡ µû¶ó ´Ù¸£¸ç, º¸ÅëÀº Case study sheet»ó µÎ°¡Áö Power failure¸¦ ±¸º°ÇÕ´Ï´Ù.

Q2. reflux°¡ ÀÖ´Â °æ¿ì´Â power failure°¡ ´ç¿¬È÷ °í·Á°¡ µÇ¾î¾ß ÇÏ´ÂÁö ¾Ë°í ½Í½À´Ï´Ù.
A2. Reflux°¡ ÀÖ´Â °æ¿ì ¹«Á¶°Ç Power failure¸¦ °í·ÁÇÏ´Â °ÍÀº ¾Æ´Õ´Ï´Ù.
    ->  Reflux Pump°¡ ÀÖ´Â °æ¿ì Power failure¸¦ °í·ÁÇÏ°Ô µÇ´Âµ¥ Pump°¡ ¾øÀÌ Gravity·Î Reflux¸¦ ÇÏ´Â Columnµµ Àֱ⠶§¹®ÀÔ´Ï´Ù.
    -> Power failure¿¡ ´ëÇÑ °í·Á´Â Àü·Â¿øÀ» »ç¿ëÇÏ´Â ±â±â¸¦ ÅëÇØ Heat in/outÀÌ ¹ß»ýÇÒ ¿©Áö°¡ ÀÖ´Â °æ¿ì °í·ÁÇÕ´Ï´Ù.
    -> ÀÌ´Â Energy balance¸¦ °ËÅäÇÏ¿© Heat in/outÀÌ ¾î¶² ±â±â¿¡ ÀÇÇØ ÀÌ·ç¾îÁö´ÂÁö °ËÅäÇϽøé Power failure¸¦ °ËÅä°¡ ÇÊ¿äÇÑÁö ¾Ë¼öÀÖ½À´Ï´Ù.
     
¿ÏÀüÃʺ¸ÀÓ¡¦ pwh303   20-03-23 16:02
´äº¯ Á¤¸» °¨»çÇÕ´Ï´Ù~
½ºÅ×Æijë Stefano   20-03-23 17:25
(0) ÀÌÀü ´ä±Û¿¡¼­ Àß ¼³¸íÇØ Áּ̽À´Ï´Ù.  ´äº¯Ã³·³.. ÇØ´ç System¿¡¼­ CondenserÀÇ Cooling Medium°ú RefluxÀÌ ¾î¶»°Ô ±¸¼ºµÇ´À³Ä¸¦ ¾Ë¾Æ¿© PSV ¹èÃ⠽󪸮¿À¸¦ ¾Ë ¼ö ÀÖÀ» °ÍÀÔ´Ï´Ù.  ¿©±â¼­´Â Áõ·ùž¿¡ ´Þ¸° PSVÀÇ ±â´É°ú ¹èÃâ·®, Power Failure½Ã °ü·Ã Utility ¿¡ °üÇØ Ãß°¡ ´ä±ÛÀ» ¿Ã¸³´Ï´Ù.

(1) Áõ·ùž PSV ±â´É°ú ¹èÃâ·®

Áõ·ùž¸¸À» ±âÁØÀ¸·Î Çϰųª Áõ·ùžÀ» Æ÷ÇÔÇÏ´Â ´ÜÀ§°øÁ¤À¸·Î ±âÁØÀ¸·Î Áõ·ùž¿¡ ´Þ·ÁÀÖ´Â PSV´Â ÁÖ·Î ¾Æ·¡ÀÇ »óȲ¿¡¼­ ÀÛµ¿ÇÏ°Ô µË´Ï´Ù.  i) Reflux Failure (Power Failure, CW Failure, or Reflux Pump Failure)  ii) Overhead Pressure Control Failure  iii) Feed Gas or Vapor(Feed Vapor, Stripping Gas or Steam) Flow Control Failure, iv) Reboiler Tube Failure

ÀÌÁß Power Failure³ª Cooling Water(CW) Failure, Reflux Pump Failure´Â °øÈ÷  i)ÀÇ »óȲÀ» ¸¸µé°Ô µÇ´Âµ¥ Feed Áß Vapor, Reboiler Áõ¹ßÁõ±â, »Ó¸¸ ¾Æ´Ï¶ó ÅõÀÔÇÏ´Â Áõ±â´Â ¸ðµÎ ¾î Áõ±â·Î ¿Ã¶ó¿Í Condenser¿¡¼­ ÀÀÃàÇÏÁö ¸øÇÏ´Â ¾çÀ» ¸ðµÎ ¹èÃâÇØ¾ß ÇÕ´Ï´Ù.  ±×·¯³ª Control Valve¿¡ ÀÇÇØ À¯·®ÀÌ Á¶ÀýµÇ´Â ¹ëºêµéÀº ´ëºÎºÐ Failure Close ÇüÅÂÀÇ ¹ëºê·Î ¼±Á¤µÇ±â ¶§¹®¿¡ ´Ù¸¥ Vapor ºÎÇÏ´Â °ÅÀÇ ¾ø°í °ÅÀÇ Á¤È®È÷ Reboiler¿¡¼­ Áõ¹ßµÇ´Â Áõ±â·®ÀÌ  PSV¹èÃâÀ¯·® ÇØ´çÇÕ´Ï´Ù.

(2) Power Failure½Ã °ü·Ã UtilityÀÇ °ø±Þ»óȲ
Power Á¤Áö½Ã¶ó°í Çصµ Instrument Air, Nitrogen, Emergency Steam, Emergency Cooling Medium, µîÀÌ ÀÏÁ¤½Ã°£ °ø±ÞÇÒ ¼ö ÀÖµµ·Ï ÇÒ ¼ö ÀÖ°í,  ¾ÆÁÖ ÁÖ¿ä Controller ÀåÄ¡¿¡ °ø±ÞÇÏ´Â Àü·ÂÀº UPS(Uninterupted Power Supply)¿¡ ÀÇÇØ ÀÏÁ¤½Ã°£ ÀçÅÊÇØ ÁÙ ¼ö°¡ ÀÖµµ·Ï µÇ¾î ÀÖÀ¸¸ç CW, BFW PumpÀÇ °æ¿ì¿¡µµ (Gas, Steam) Turbine Pump 2Áß 3ÁßÀ¸·Î Back-upµÇ¾î ¿îÀüµÇ´Â °æ¿ì°¡ Àֱ⠶§¹®¿¡ Áß¿äÇÑ ½Ã¼³ÀÇ °æ¿ì °ü·Ã½Ã¼³ÀÇ ±¸¼º°ú ½Ã³ª¸®¿À¸¦ Á¶»ç, °ËÅäÇÏ°í À̸¦ °ËÁõÇÏ°í °úÁ¤ÀÌ ÇÊ¿äÇÕ´Ï´Ù.

(3) Control Valve Failure ½Ã ¹èÃâ·®
°øÁ¤À¯Ã¼³ª À¯Æ¿¸®Æ¼ È帧À» Á¦¾îÇÏ°í ÀÖ´Â Control ValveÀÇ °æ¿ì Instrument Air³ª Power Failure½Ã ValveÀÇ PositionÀ» ¼³°è½Ã  ¹Ì¸® Á¤Çصδµ¥ À̵é ValveÀÇ Failure PositionÀ» Âü°íÇÏ¿© Emergency½Ã PSV ¹èÃâ·®À» »êÁ¤ÇØ¾ß ÇÕ´Ï´Ù.

Valve Safe PositionÀº Control Valve°ø±Þ IA ȤÀº Power Failure½Ã Ãë±ÞÀ¯Ã¼¸¦ Â÷´Ü(Fail Close)Á¤ÁöÇϰųª, Áö¼ÓÇϰųª(Fail Locked),  °³¹æ(Fail Open)Çϴµ¥ °¢°¢ÀÇ ¹ëºêµéÀº ±× »ç¿ë Ư¼º¿¡ µû¶ó (1)¹èÃâºÎÇϸ¦ ÁÙÀÌ°í, (2)±â±â¸¦ º¸È£Çϸç (3)°øÁ¤¼Õ½ÇÀ» Àý°¨ÇÏ´Â ¹æÇâÀ¸·Î µ¿ÀÛÇϱ⠶§¹®¿¡ ±×¿¡ µû¸¥ ¹èÃâ·®À» »êÃâÇØ¾ß ÇÏÁö¿ä.
     
·ÎÁø bless20   20-03-24 08:32
¾È³çÇϼ¼¿ä. Ç×»ó ÁÁÀº ´äº¯ °¨»çµå¸³´Ï´Ù.
À§¿¡ ´ä±Û·Î ¾²½Å ³»¿ë Áß ±Ã±ÝÇÑ »çÇ×ÀÌ ÀÖ¾î ÁúÀǵ帳´Ï´Ù.
(3)¹ø »çÇ׿¡¼­ 'À̵é ValveÀÇ Failure PositionÀ» Âü°íÇÏ¿© Emergency½Ã PSV ¹èÃâ·®À» »êÁ¤ÇØ¾ß ÇÕ´Ï´Ù.' ¶ó°í ÇϽŠ¹®±¸¸¦ Çؼ®ÇÏÀÚ¸é Fail position¿¡ µû¸¥ Load°¡ ´Ù¸¥ °Í°°Àº »ý°¢Àε¥ ¸Â°Ô ÀÌÇØÇÑ °ÍÀÎÁö¿ä?
Àú´Â ÀϹÝÀûÀ¸·Î Control valve failure½Ã Failure position¿¡ »ó°ü¾øÀÌ Valve wide openÀ» »êÁ¤ÇÏ¿© Rated Cv¿¡ µû¸¥ À¯·®À» ¹èÃâ¿ë·®À¸·Î »êÁ¤ÇÏ¿´½À´Ï´Ù.
Ȥ½Ã Á¦°¡ ÀÌÇظ¦ À߸øÇÑ °ÍÀÎÁö¿ä?
½ºÅ×Æijë Stefano   20-03-25 00:51
Contol ValveÀÇ Failure PositionÀ» ¼±Á¤ÇÏ´Â ÀÌÀ¯°¡  Process Upset½Ã °øÁ¤ ¾ÈÀüÀ» À§ÇØ °í·ÁÇÏ´Â °ÍÀÔ´Ï´Ù.
¿¹¸¦µé¾î Column¿¡ Stripping SteamÀÌ °ø±ÞµÇ°í ÀÖ´Ù¸é ÀÌ SteamÀº Power Failure³ª IA Failure½Ã ¿ÏÀüÈ÷ ´ÝÈ÷°Ô µÇµµ·Ï ¼³°èµÉ °ÍÀÔ´Ï´Ù.  ÀÌ Valve°¡ Failure½Ã Wide OpenµÇµµ·Ï ¼³°èµÇ¾ú´Ù¸é Upset½Ã Vapor Load´Â Å©°Ô »ó½ÂÇÏ°ÔµÉ °ÍÀ̱⠶§¹®ÀÔ´Ï´Ù. 

¸ðµç ¹ëºê¸¦ Fail OpenÇÑ´Ù¸é ¿Ö  FC, FL, FO·Î ±¸ºÐÇÏ¿© PID¿¡ Ç¥±âÇÒ ÇÊ¿ä°¡ ¾øÁö¿ä.
     
·ÎÁø bless20   20-03-25 08:37
¹°·Ð Fail positionÀ» ÁöÁ¤ÇÏ¿© ¸»¾¸ÇϽŠUpset»óȲ½Ã ´ëºñÇÕ´Ï´Ù¸¸, Á¦°¡ ¿©Â庸°íÀÚ ÇÏ´Â °ÍÀº Control valve failure openÀÌ µÉ °æ¿ì¸¦ »êÁ¤ÇÒ °æ¿ì ±×·¯ÇÑ Fail position¿¡ »ó°ü¾øÀÌ Full openÀÌ µÇ¾ú´Ù°í °¡Á¤ÇÏ°í Rated Cv·Î Load¸¦ »êÁ¤ÇÏ¿´´Âµ¥ ±×°Ô ¸Â´ÂÁö¸¦ ¿©Âã´Â°ÍÀÔ´Ï´Ù.
Fail positionÀ» Âü°íÇÑ´Ù´Â Àǹ̰¡ °¢ Fail position¸¶´Ù ´Ù¸¥ Load»êÁ¤À» Çϴ°ÍÀÎÁö? ¾Æ´Ï¸é Fail positionÀÌ FC·Î µÇ¾îÀÖ´Ù¸é Fail open case´Â °í·ÁÇÏÁö ¾ÊÀ¸½Ã´ÂÁö°¡ ±Ã±ÝÇÕ´Ï´Ù.
½ºÅ×Æijë Stefano   20-03-26 02:42
Q: <..Fail position¿¡ »ó°ü¾øÀÌ Full openÀÌ µÇ¾ú´Ù°í °¡Á¤ÇÏ°í Rated Cv·Î Load¸¦ »êÁ¤ÇÏ¿´´Âµ¥ ±×°Ô ¸Â´ÂÁö..?>
-->A:  ÀüÇô ¸ÂÁö ¾Ê½À´Ï´Ù.  ¼³°èµÈ ±×´ë·Î Áï FC, FL. FO Ç¥½ÃµÈ ´ë·Î »êÁ¤ÇÏ¿©¾ß µË´Ï´Ù.   

(FC¶ó¸é FO´Â °í·ÁÇÏÁö ¾Ê½À´Ï´Ù.  FC¹ëºê´Â IA Failure½Ã ±â°èÀûÀ¸·Î Â÷´ÜµÇµµ·Ï µÇ¾î ÀÖ´Â ±¸Á¶À̱⠶§¹®ÀÔ´Ï´Ù. ¶ÇÇÑ FC ¶Ç´Â FL·Î µÇ¾îÀִµ¥ À̸¦ ÀÓÀÇ·Î FO·Î ¹Ù²Ù¾î °è»êÇÏ·Á¸é PID¸¦ ¼öÁ¤Çؼ­ PID¼öÁ¤ ±ÇÇÑÀ» °¡Áø »ç¶÷ÀÇ ½ÂÀÎÀÌ ¹Ýµå½Ã ÇÊ¿äÇÕ´Ï´Ù. )
   

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