Pilot Study On A New Solid Sorbent For Nitric Oxide Removal

Exhaust gas emitted from coal-fired boilers has always been one of the key management targets,and NO is one of the major pollutants in boiler flue gas.In previous study of our research group,a new sorbent(A)was found having a good removall effect on NO.Therefore,this method was further tested with a pilot experimental equipment.Firstly,the optimal operation condition for the removal of NO by the sorbent was determined in the laboratory,which includes the temperature range and gas retention time.After the experiment,we found that the optimal operation condition is in a temperature range of 70 ??90 ?,with the gas residence time of 1?2 s.It was found the adsorption of NO wass up to 81%.When the temperature was lower than 50 ? there is no significant on NO removal,and while the temperatures was above 100 ? the NO adsorbed by the sorbent will begin to release.Based on the experiment,we designed a pilot devices and conducted a field test,.It was found that the removal of NO was about 66%.The solid sorbent before and after the reaction was analyzed by infrared spectroscopy(FTIR)and Raman spectroscopy.And we found that there was no difference in FTIR patterns.It is thought that the adsorption of NO escaped when the preparation of the sample after the reaction by grinding process..Raman was also used to analysis the solid products of the reaction.By comparison we found that the NO was adsorbed on the surface of sorbent.An UV spectrophotometry was also used to prove the product by the sorbent.