Application Of Denitration Aid In Flue Gas Treatment Of K Petrochemical 1.4Mt/a Heavy Oil Catalytic Cracking Unit

In order to carry out the low load production requirements of catalyticcracking device,K petrochemicalenterprise changed the components of crude oil from 1.6 Mt/a waxoil to 1.4 Mt/a heavy oil.The existing technologies of desulfurizationanddenitrification could not take the high emission of NOx.The increasing numbers of NOx in flue gas was far more than its permissiblevalue,and the treated gases turned yellow.Besides,with the scurviness of our environment,we were strictly required to purify the emission of flue gas.Then,K petrochemicalenterprise had to put forward some measures on the optimization of desulfurizationanddenitrification technologies.Compared with the technologies at home and abroad,we decided to use the denitrification additives to reduce the content of NOx in the FCC flue gas.The specific optimizationprocedures were as follows:(1)The possibility usage exploration of the denitrification additives.Under the desulfurizationanddenitrification technology of LoTOxTM/EDV(?),we manually added the denitrification additives.The removal of NOx was obvious.(2)To optimizethe amount of the denitrification additives.During manual operation,we gradually changed the number of the denitrification additives.(3)To explore the automatical addition of the mixed catalyst and the denitrification additives.When we put the denitrification additives into the reaction containers one-off,the unevenness of the catalyst were increased,as well as the unevenness of C component.The intermediateproduct-CO were burned again.And the dilute temperature of the regenerator was increased.So we decided to put the mixed catalyst and the denitrification additives into the reactor atomatically to optimize the operation parameters ofdenitrification.And the results showed that this technology is feasible.By using this technology,the 1.4 Mt/a FCC flue gas could reach the emission limit and achieve the goal of under load production.Recently,K petrochemical enterprise used the optimisation of denitrification additives by automical addition,and the amount of the denitrification additives was 25.2 kg/d.