Material balance calculations produced the following expected flue gas compositi
ID: 1816824 • Letter: M
Question
Material balance calculations produced the following expected flue gas composition: N2 = 71%, CO2 = 11%, H2O = 10%, O2 = 8%, The calculated temperature and pressure are 300 deg F and 1 atm. A combustion model indicates that the HCl concentration will be 35 ppm. Will this flue gas meet the standard of 25 ppm, dry volume, corrected to 7% O2?I know it must be corrected to dry standard conditions, I know first I should remove the moisture and correct the volume to standard conditions.....however, I am not sure whether to assume a volume say 1 m^3 or whether the volume can be calculated from the percentages. After that, I assume I will use this equation......
C.corr= C.dcsm * (21-7)/(21-Y)
where C.corr is the concentration corrected to 7% oxygen.
C.dscm is the concentration corrected to dry standard conditions
Y is the percent oxygen in the flue gas, dry conditions
Explanation / Answer
How could it? You are removing H2O which will increase the fraction of HCl and you are removing O2, which will also increase the fraction of HCl. Both factors increase the ppm of HCl. The only way ppm HCl would decrease is if HCl combines with the water vapor and HCL is removed along with the water during the drying process.