What type of emission control measures are currently in place at Boswell Unit 3?
Boswell Unit 3 has a tangentially-fired boiler burning low sulfur, low mercury sub-bituminous coal. PM emissions are currently controlled by a wet particulate scrubber which also removes approximately 30 percent of boiler SO2 emissions. In addition, as operating conditions allow, Minnesota Power operates the top burner level as a combustion air port to lower NOx emissions.
