Comparative Evaluation of Biomass Power Generation Systems in China Using Hybrid Life Cycle Inventory Analysis

Table 8

Major parameters for biomass feedstock supply.

Items	Value
Straw/grain ratio	0.75
Corn production (kg/mu)	422.4
Lower heating value (LHV) of corn stover (MJ/kg, dry basis)	15.6
Moisture content of corn stover (wt%)	10
Sulfur content of corn stover^a (wt%)	0.21
Distribution density of biomass^b (t/km)	103.3
Average transport distance from straw-receiving station to the plant^c (km)	30
CO2 emission factor of diesel^d (g/GJ)	74100
SO2 emission factor of diesel^e (g/GJ)	93.78
NO emission factor of diesel^f (g/GJ)	643.19

Note: ^aan average value of sulfur content of corn stover from Cuiping et al. [26] was adopted to ensure that the BPG systems were comparable.
^bThe transport distance for centralized pattern was calculated using a farmland coverage rate of 0.7 and a availability factor of 0.4 in the model [22]. It was assumed that the collection area is assumed to be a circle centered at the straw-receiving station and the centralized storage site, where the straw is evenly distributed [22].
^cThe average transport distance is used for the distributed pattern in the cases of 25 MW biomass-only fired and 140 MW cofiring.
^dCO₂, CH₄, and N₂O emission factors for diesel utilization were adopted from IPCC road transport default values, the latter two of which are 3.9 g/GJ [18].
^eThe Chinese specific value for sulfur content of diesel was taken from Song [27]. And the emission rate of sulfur was assumed to be 100%.
^fThe Chinese specific value of NO emission for diesel vehicles is 27.4 kg/t [28].