<prompt> Translate the following text to EnglishReagents ni pamoja na: Chalk kwa ajili ya FGD mifumo, SCR catalyst, Ammonium, urea, na AC kwa ajili ya ACI mifumo.  <response>: The major groups of reagents considered in this Section include limestone for FGD systems, SCR catalyst, AmmoniaUrea, and AC for ACI systems. 