On April 29, 2010, the US Environmental Protection Agency (EPA) proposed three rules to regulate hazardous air emissions from commercial, institutional and industrial boilers, process heaters and incinerators at major and area sources.
One of the proposed rules addresses boilers at area sources – facilities that potentially emit less than 10 tons per year (tpy) of any single hazardous air pollutant or 25 tpy of combined air toxics. The rule will apply to facilities with boilers that burn coal, oil or biomass (i.e., wood), but not waste materials. New boilers that burn coal would need to meet emission standards for mercury, particulates and carbon monoxide. New boilers burning oil or biomass will need to meet emission limits for particulates and carbon monoxide. Existing large boilers (heat input of 10 million Btu/hr or greater) that burn coal will be required to meet emission limits for mercury and carbon monoxide; existing large boilers that are oil or biomass-fired will have an emission limit for carbon monoxide, only. The rule requires that all facilities with large boilers conduct an energy assessment to identify practicable conservation measures. Facilities with small boilers will be required only to conduct a boiler tune-up at least once every two years.
The second rule applies to boilers and process heaters at major source facilities. The rule will apply to boilers that burn natural gas, fuel oil, coal, biomass or other gas, but not waste, and to process heaters (which heat raw or intermediate materials in an industrial process).
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