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diff --git a/1943/CH5/EX5.4/Ex5_4.sce b/1943/CH5/EX5.4/Ex5_4.sce
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+
+clc
+clear
+//Input data
+O=35;//The output of the fluidized bed combustion system in MW
+n=0.80;//Efficiency of the fluidized bed combustion system 
+H=26;//The heating value of coal in MJ/kg
+S=3.6;//Sulphur content in the coal in %
+C=3;//The calcium sulphur ratio 
+Ca=85;//The amount of calcium carbonate in the limestone in %
+CaCO3=100;//The molecular weight of CaCO3
+
+//Calculations
+Cb=O/(n*H);//Coal burning rate in kg/s
+Cb1=Cb*3600;//Coal burning rate in kg/h
+Sf=(Cb1*(S/100))/32;//Flow rate of sulphur in Kmol/h
+Cf=Sf*C;//The flow rate of calcium in Kmol/h
+Caf=Cf*CaCO3;//Mass flow rate of CaCO3 in kg/h
+L=Caf/(Ca/100);//Mass flow rate of limestone in kg/h
+
+//Output
+printf('The required flow rate of limestone is %3.1f kg/h ',L)