FGD increases particulate emissions in one study
This is an 8-year old study showing increases in particulate emission through
the FGD. The U.S. experience is that well operated FGD systems aid in
particulate reduction and that condensibles are not increased but that they can
occur in the stack and be measured by the PM monitor rather than forming after
they leave the stack. In either case the net effect is the same. We will
contact the authors including Ping.
Particulate matter emissions of filterable particulate matter (FPM), condensible
PM (CPM), PM10, and PM2.5 at FGD inlet and stack in a coal-fired power plant
were measured by EPA method 201A and method 202. The results indicated that
emissions of total particulate matter (TPM) are 40.99mg/m3 and 120.58mg/m3, and
the filterable PMs are the highest emissions at both sampling locations which
accounted for 76.3% and 75.4% of TPM, the PM10 are 14.73mg/m3 and
88.23 mg/m3, the PM2.5 are 3.17mg/m3 and 52.15mg/m3
at FGD inlet and stack, respectively. The concentration of PMs in flue gas
increases significantly after the flue gas passes through the FGD unit. The
increase values of PM10/FPM and PM2.5/FPM ratios are 106% and 266%,
respectively, but the CPM/TPM ratio is almost at the same level (23.7~24.6mg/m3)
after the flue gas passes through the FGD. The test indicated that FGD operation
has a significant effect on particulate matters emission due to releasing finer
particles and part volatile metals in FGD slurry. Some measures should be taken
to control PM emissions for a utility boiler equipped with an FGD unit.