title: Nitrogen oxides emissions from the MILD combustion with the conditions of recirculation gas.
abstract: The nitrogen oxides (NOx) reduction technology by combustion modification which has economic benefits as a method of controlling NOxemitted in the combustion process, has recently been receiving a lot of attention. Especially, the moderate or intense low oxygen dilution (MILD) combustion which applied high temperature flue gas recirculation has been confirmed for its effectiveness with regard to solid fuel as well. MILD combustion is affected by the flue gas recirculation ratio and the composition of recirculation gas, so its NOxreduction efficiency is determined by them. In order to investigate the influence of factors which determine the reduction efficiency of NOxin MILD coal combustion, this study changed the flow rate and concentration of nitrogen (N2), carbon dioxide (CO2) and steam (H2O) which simulate the recirculation gas during the MILD coal combustion using our lab-scale drop tube furnace and performed the combustion experiment. As a result, its influence by the composition of recirculation gas was insignificant and it was shown that flue gas recirculation ratio influences the change of NOxconcentration greatly.
  
  
  
  We investigated the influence of factors determining the nitrogen oxides (NOx) reduction efficiency in MILD coal combustion, which applied high-temperature flue gas recirculation. Using a lab-scale drop tube furnace and simulated recirculation gas, we conducted combustion testing changing the recirculation gas conditions. We found that the flue gas recirculation ratio influences the reduction of NOxemissions the most.
authors.affiliation: a Department of Environmental Engineering , Chungbuk National University , Cheongju , Korea.
authors.forename: Min
authors.initials: M
authors.lastname: Park
authors.affiliation: b Research Division for Environment and Energy Systems , Korea Institute of Machinery & Materials , Daejeon , Korea.
authors.forename: Sung Hoon
authors.initials: SH
authors.lastname: Shim
authors.affiliation: b Research Division for Environment and Energy Systems , Korea Institute of Machinery & Materials , Daejeon , Korea.
authors.forename: Sang Hyun
authors.initials: SH
authors.lastname: Jeong
authors.affiliation: c Department of Environmental Engineering , Pusan National University , Busan , Korea.
authors.forename: Kwang-Joong
authors.initials: KJ
authors.lastname: Oh
authors.affiliation: a Department of Environmental Engineering , Chungbuk National University , Cheongju , Korea.
authors.forename: Sang-Sup
authors.initials: SS
authors.lastname: Lee
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide; D003031:Coal; D006358:Hot Temperature; D009584:Nitrogen; D009589:Nitrogen Oxides / Q000032:analysis*; D010100:Oxygen; D013672:Technology / Q000379:methods*
chemical_list: D000393:Air Pollutants; D003031:Coal; D009589:Nitrogen Oxides; D002245:Carbon Dioxide; D009584:Nitrogen; D010100:Oxygen