ColumnÀÇ turndown ratio¸¦ ÀϹÝÀûÀ¸·Î feedÀÇ load¸¦ ±âÁØÀ¸·Î ¾Æ·¡¿Í °°ÀÌ ±¸ÇÏ´Â °ÍÀ¸·Î ¾Ë°í ÀÖ½À´Ï´Ù.
turndown rate/design rate = turndown ratio
Ç㳪, columnÀÇ top, bottom¿Ü¿¡ sideÀÇ Á¦Ç°ÀÌ ÀÖ´Â °æ¿ì turndownÇÏ¿© ¿îÀü ½Ã, feedÀÇ ºñ¿Í side productsÀÇ ºñ°¡ ´Ù¸¥ °æ¿ì°¡ ¹ß»ýÇÕ´Ï´Ù. ÀÌ·±°æ¿ì¿¡´Â ¾î¶² °÷À» ±âÁØÀ¸·Î ratio¸¦ ¼±Á¤ÇÏ´Â °ÍÀÎÁö ±Ã±ÝÇÕ´Ï´Ù.
°¡·É, ¾Æ·¡ÀÇ load¶ó¸é feed±âÁØÀ¸·Î´Â (70/100*100=70%)°¡ µÇ´Â °ÍÀÌ°í, side product ±âÁØÀ̸é (10/20*100=50%)°¡ µË´Ï´Ù. ¼·Î ´Ù¸¥ °üÁ¡À¸·Î ÀÎÇÏ¿© ¿ÀÇØ°¡ ¹ß»ýÇÒ ¼ö Àִµ¥ ¸¹Àº ¼±ÈĹè´ÔµéÀÇ ÀÇ°ßÀ» ºÎŹµå¸³´Ï´Ù.
(kg/hr) normal turndown
feed = 100 70
top = 40 30
bottom = 40 30
side = 20 10