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This might be a stupid question but...

I am looking over this document for allowable emissions for PM particles in biomass furnaces.

They are given in lbs/MBTU, pounds per million British Thermal Units of heat input

How is this converted into concentration values? I know BTU is easily converted to joules.

Don't I have to know the composition of my biomass to convert? For one kg of biomass I get a certain amount of PM, but is this generally converted to concentration levels, e.g. mg/cc

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Each type of fuel has its own heat content (expressed in BTU/lb or J/kg), usually listed under typical fuel/air mix percentages. Also the type and age of furnace, presence of filters/scrubbers would influence generation of particulate matter. –  Deer Hunter May 2 '13 at 9:25
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