A Study on NOx Removal in Combustion Flue Gas by NH3 Gas Injection (I)
1988 Volume 67 Issue 8 Pages 693-702
Details
1988 Volume 67 Issue 8 Pages 693-702
NH3 gas which is injected into flue gas, decompose NOx selectively in non-catalytic conditions under the presence of oxygen and high temperature (900°C-1100°C).
This. report describes experimental results about the effects of NH3 gas injection conditions on NOR decomposition process by using the combustion test facility. Main results are as follows.
(1) There was an optimum temperature in noncatalytic NOx removal process by NH3 gas injection and it's temperature was about 1050°C.
(2) The optimum temperature which gave maximum NOR removal efficiency decreased linearly by the injection of H2 mixed with NH3 gas.
(3) NOR removal efficiency increased with increasing of NH3 gas injection ratio, however if NH3/NOx mole ratio was over 2, non reacted NH3 was detected in flue gas.
(4) In order to decrease non reacted NH3 and to get high NOR removal efficiency, we recommend NH3 gas injection conditions in which gas temperature at the point of NH3 injection is higher 50°C-60°C than the optimum temperature and NH3/NOR mole ratio is 3-5.
(5) In the application of this method to flue gas contained very high NOR concentration, multi stage NH3 gas injection method will be effective.
