Abstract:

A Chinese bituminous coal was firstly separated into three density fractions, heavy (>2.0 g·cm-3), medium (1.4—2.0 g·cm-3) and light (<14 g·cm-3) by using the floatsink methodNext,the combustion and pyrolysis of each density fraction were carried out in a laboratoryscale drop tube furnace to understand the emission, elemental composition and formation mechanism of inhalable particulate matter (PM10)PM10 was collected with a 13 stages low pressure impactor (LPI) having aerodynamic cutoff diameter ranging from 10.0 μm to 0.03 μm for a sizesegregated collectionThe experimental results indicated that density affected PM10 emission significantly in combustion,and decreasing coal density led to the formation of more PM10The mineral particle size of the light fraction was the smallest and that of the heavy fraction was the largestThe swelling ratio, total pore volume and BET surface area of char produced from each fraction were differentThose from the light fraction were the largest and those from the heavy fraction were the smallest.The elemental composition of PM10 collected from each density fraction had the same trendIn the submicron particulate matter (PM1): element S+alkali metals+others>refractory metals， in the supermicron particulate matter (PM1—10): the mass percent of refractory metals were greater than 80% and exceeded other three types of element.