▁and ▁calc iner ▁can ▁use ▁fluid ized ▁bed ▁technology , ▁due ▁to ▁the ▁good ▁gas - sol id ▁contact ing ▁and ▁uniform ▁bed ▁temperature . ▁Fl uid ized ▁bed ▁technology ▁has ▁already ▁been ▁demonstrated ▁at ▁large ▁scale : ▁large ▁( 4 6 0 M We ) ▁atmos pher ic ▁and ▁press ur ized ▁systems ▁exist , ▁and ▁there ▁is ▁not ▁a ▁need ▁for ▁int ensive ▁scaling ▁up ▁as ▁there ▁is ▁for ▁the ▁sol vent ▁scr ub bing ▁to wers ▁used ▁in ▁am ine ▁scr ub bing . ▁ ▁Also , ▁the ▁calci um ▁looping ▁process ▁is ▁energy ▁efficient . ▁ ▁The ▁heat ▁required ▁for ▁the ▁end oth erm ic ▁calc ination ▁of ▁Ca CO 3 ▁and ▁the ▁heat ▁required ▁to ▁raise ▁the ▁temperature ▁of ▁fresh ▁lim estone ▁from ▁ambient ▁temperature , ▁can ▁be ▁provided ▁by ▁in - s itu ▁o xy - f ired ▁comb ust ion ▁of ▁fuel ▁in ▁the ▁calc iner . ▁ ▁Although ▁additional ▁energy ▁is ▁required ▁to ▁separate ▁O 2 ▁from ▁N 2 , ▁the ▁majority ▁of ▁the ▁energy ▁input ▁can ▁be ▁recovered ▁because ▁the ▁carbon ator ▁reaction ▁is ▁ex oth erm ic ▁and ▁CO 2 ▁from ▁the ▁calc iner ▁can ▁be ▁used ▁to ▁power ▁a ▁steam ▁cycle . ▁A ▁solid ▁pur ge ▁heat ▁ex ch anger ▁can ▁also ▁be ▁util ized ▁to ▁recover ▁energy ▁from ▁the ▁de activ ated ▁Ca O ▁and ▁coal ▁as hes ▁from ▁the ▁calc iner . ▁As ▁a ▁result , ▁a ▁relatively ▁small ▁efficiency ▁penalty ▁is ▁im posed ▁on ▁the ▁power ▁process , ▁where