<prompt> Translate the following text to EnglishUpgrades kwa mifumo ya sasa ya FGD itajumuisha uchunguzi wa kesi kwa kesi ya mnara wa absorber, mlango wa gesi ya flue, kasi ya gesi ya absorber, maandalizi ya reagent, kuboresha pampu, na mabadiliko ya uwezekano wa baadhi ya mambo ya ndani, aina ya reagent, na mchakato wa kemikali ili kuongeza utendaji.  <response>: Upgrades to existing FGD systems would include a case-by-case examination of the absorber tower, flue gas inlet, absorber gas velocity, reagent preparation, upgrade pumps, and potential changes to some internals, the type of reagent, and to the chemical processes to increase performance. 