DESIGN â
Last Stage(ÃÖÁ¾´Ü) ÅÇ
Design Heat BalanceÀÇ Condensing TurbineÀÇ Last Stage °è»ê Á¶°ÇÀ» ÀÔ·ÂÇϴ âÀÔ´Ï´Ù.
À̰÷¿¡¼ ¼±ÅÃÇÑ "Condensing Flows" ÄÞº¸ ¹Ú½ºÀÇ ¼±Åà »çÇ×Àº "Start" ÅÇÀÇ ÇØ´ç ÄÞº¸ ¹Ú½º¿¡ ÀÚµ¿À¸·Î ¹Ý¿µµË´Ï´Ù.
Condensing Flows
Àú¾Ð Åͺó ¹è±â(LP Turbine Exhaust) À¯·® ¼ö¸¦ ¼±ÅÃÇÏ´Â ÄÞº¸ ¹Ú½ºÀÔ´Ï´Ù.
¼±ÅÃÇÒ ¼ö ÀÖ´Â À¯·® ¼ö´Â, Single Flow, 2 Flows, 4 Flows, 6 Flows ÀÇ 4°¡Áö °æ¿ìÀÔ´Ï´Ù.
Single Flow¸¦ ¼±ÅÃÇϸé, Àç¿ ÅͺóÀº Áß¾Ð(IP) Åͺó°ú Àú¾Ð(LP) ÅͺóÀÌ ºÐ¸®µÇÁö ¾Ê°í, ÇϳªÀÇ ÁßÀú¾Ð(ILP) ÅͺóÀ¸·Î ÇØ¼®µË´Ï´Ù.
Condensing Flows´Â ÃÖÁ¾ ´Ü(Last Stage Blade)ÀÇ Áõ±â À¯·®¿¡ µû¶ó ÀûÁ¤ÇÑ À¯¼ÓÀ» À¯ÁöÇÒ ¼ö ÀÖµµ·Ï ¼±Á¤µÇ¾î¾ß ÇÕ´Ï´Ù. ÇÏÁö¸¸, Design Heat Balance¸¦ °è»êÇØ º¸±â Àü¿¡´Â ÀûÇÕÇÑ Condensing FlowsÀÇ ¼±ÅÃÀÌ ¾î·Æ½À´Ï´Ù.
ES_Rankine¿¡´Â, Design Heat Balance °è»ê ÈÄ ÃÖÁ¾ ´ÜÀÇ Áõ±â À¯¼ÓÀÌ ÀûÁ¤ À¯¼Ó(200 m/s ~ 300 m/s)À» ¹þ¾î³ª´Â °æ¿ì, ÀûÁ¤ À¯¼ÓÀ» À¯ÁöÇϱâ À§ÇÑ ÃÖÁ¾ ´ÜÀ» ÀÚµ¿ ¼±Á¤ÇØÁÖ´Â ±â´ÉÀÌ ÀÖ½À´Ï´Ù. ±×·¯¹Ç·Î, Ãʱâ ÀÔ·Â ½Ã Condensing Flows ¼±Á¤ÀÌ ¾î·Á¿ì¸é, ÀÏ´Ü ÀûÀýÈ÷ ¼±Á¤ÇÏ¿© °è»êÀ» ½ÇÇàÇÑ ÈÄ, °è»ê ½ÇÇà ÈÄ ÀûÁ¤ À¯¼Ó ¼±Á¤À» ÀÚµ¿À¸·Î ½ÇÇàÇÒ °ÍÀÎÁö¸¦ ¹¯´Â ¸Þ½ÃÁö¿¡ "¿¹"¶ó°í ´äÀ» ÇÏ¿©, ÀûÁ¤ À¯¼ÓÀ» °®´Â ÃÖÁ¾´ÜÀ» ¼ÒÇÁÆ®¿þ¾î°¡ ¼±ÅÃÇϵµ·Ï ÇÏ¸é µÉ °ÍÀÔ´Ï´Ù.
Condensing Flow Total
°è»êµÈ º¹¼ö Åͺó ¹è±â Ãⱸ ÃÑ À¯·®À» Ç¥½ÃÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù. »ç¿ëÀÚ°¡ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½º°¡ ¾Æ´Õ´Ï´Ù.
Condensing Flow Each
°è»êµÈ º¹¼ö ÅͺóÀÇ °¢ ¹è±â ÃⱸÀÇ À¯·®À» Ç¥½ÃÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù. »ç¿ëÀÚ°¡ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½º°¡ ¾Æ´Õ´Ï´Ù.
Blade Length(BL)
º¹¼ö Åͺó ÃÖÁ¾ ´ÜÀÇ Blade Length, Áï Blade Roots ºÎÅÍ Blade Edge ±îÁö ±æÀ̸¦ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù.
Pitch Diameter
Blade Áß°£ ÁöÁ¡À» ¿¬°áÇÑ ¿øÀÇ Á÷°æ(Diameter)ÀÎ Pitch Diameter¸¦ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù.
Rotating Speed
Åͺó RotorÀÇ È¸Àü¼ö¸¦ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù.
Annulus Velocity(Van)
°è»êµÈ Åͺó ÃÖÁ¾ ´ÜÀÇ Áõ±â À¯¼ÓÀ» Ç¥½ÃÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù. »ç¿ëÀÚ°¡ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½º°¡ ¾Æ´Õ´Ï´Ù.
Annulus Velocity, Van = Qa / An / RPM
ÁÖ) |
|
Qa |
: Åͺó ÃÖÁ¾´Ü Ãⱸ Áõ±â üÀû À¯·® |
An |
: Åͺó ÃÖÁ¾´Ü Annulus Area |
RPM |
: Åͺó ÃÖÁ¾´Ü Rotor ȸÀü¼ö |
Annulus Area, An = 3.14 x PD x BL
ÁÖ) |
|
PD |
: Pitch Diameter |
BL |
: Blade Length |
Exhaust Loss
°è»êµÈ Exhaust Loss (¹è±â ¼Õ½Ç) °ªÀ» Ç¥½ÃÇÏ´Â ÅØ½ºÆ® ¹Ú½ºÀÔ´Ï´Ù. »ç¿ëÀÚ°¡ ÀÔ·ÂÇÏ´Â ÅØ½ºÆ® ¹Ú½º°¡ ¾Æ´Õ´Ï´Ù.
Reference Design
ÂüÁ¶¿ë Last Stage µ¥ÀÌÅÍÀÔ´Ï´Ù. ÇöÀç´Â ¹Ì±¹ Åͺó ¾÷üÀÎ General Electric »ç¿¡¼ IssueÇÑ Âü°í ¹®Çå¿¡¼ ȹµæÇÑ ÀÚ·áµé¸¸ ¼ö·ÏµÇ¾î ÀÖ½À´Ï´Ù.
Exhaust Loss Application
ÀÚµ¿À¸·Î °è»êµÈ Exhaust Loss °ªÀ» Àû¿ëÇÒÁö ¾Æ´Ï¸é »ç¿ëÀÚ°¡ Á÷Á¢ ÀÔ·ÂÇÑ °ªÀ» Àû¿ëÇÏ´ÂÁö¸¦ ¼±ÅÃÇÏ´Â ¿É¼Ç ´ÜÃßÀÔ´Ï´Ù.
Apply Constantly ¿É¼Ç ´ÜÃ߸¦ ¼±ÅÃÇØ¼ »ç¿ëÀÚ°¡ Á÷Á¢ ÀÔ·ÂÇÑ °ªÀ» Àû¿ëÇϰíÀÚ ÇÏ´Â °æ¿ì¿¡´Â, Design Load¿¡¼ Àû¿ëÇÒ Exhaust Loss °ª°ú Design Annulus Velocity(Van) °ªÀ» ÀÔ·ÂÇØ¾ß ÇÕ´Ï´Ù.
ÀÔ·ÂÇÑ Design Annulus Velocity´Â Part Load(ºÎºÐ ºÎÇÏ)¿¡¼ÀÇ Exhaust Loss¸¦ °è»êÇϱâ À§ÇÑ ±âÁØÀ¸·Î »ç¿ëµË´Ï´Ù. Exhaust Loss Curve´Â ¼ÒÇÁÆ®¿þ¾î ÀÚü¿¡ ³»ÀåµÈ Loss Curve¸¦ »ç¿ëÇÕ´Ï´Ù.
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