Experimental study on SCR control strategy for a marine diesel engine
In order to reduce marine diesel engines NOxemission,the open-loop and closed-loop control strategies of the diesel selective catalytic reduction aftertreatment system are analyzed,the NOxconversion and NH3 leakage under different strategies and operating conditions are compared.The results show that with the open-loop control,when the load ratio of diesel engine is above 75%,the NOxconversion efficiency can reach 83%,but the fluctuation of NOxconversion is more than 20%.With the closed-loop control strategy,the conversion of NOxis stable at about 85%,and the volume fraction of NH3 leakage is less than 20×10-6 under different operating conditions.The closed-loop control strategy has the advantages of self-adjustment of NOx conversion,high stability and fast response speed,which can reduce NOxemission and NH3 leakage volume fraction within the specified range.
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