BIOETHANOL GREENHOUSE GAS CALCULATOR - HGCA

226.2 Farming Inputs and YieldsFor calculation of default GHG emissions from the farming component of thebioethanol production chain, the values in Table 6are used.Table 6: Default farming inputs and yieldsInputs Straw ploughed back All straw removedDiesel fuel, l/ha 141 141K fertilizer (as K), kg/ha 46 164P fertilizer (as P), kg/ha 41 53N fertilizer (as N), kg/ha 185 253Pesticides (as active ingredient), 2 2Seed material, kg/ha 185 185YieldsWheat grain, t/ha 8.0 8.0Wheat Straw, t/ha 1.42 1.426.3 Pre-processing (Drying and Storage)For the default case, wheat grain is assumed to be harvested at 16% mass moisture anddried to 3% mass moisture before delivery to the ethanol plant. The drying and storageof the wheat consumes 18.5 litres of diesel fuel and 11.7 kWh of electricity per tonneof dried grain produced.6.4 Transport to ProcessingIn all default production chains, dried wheat grain is assumed to be transported byroad in diesel-fuelled trucks over an average distance of 50 km from the farm toethanol plant.6.5 ProcessingThe default processing plant yields 416 litres of anhydrous ethanol per tonne of driedwheat grain delivered to the plant. Additionally, 1.14 tonne of distiller’s dried grainsand solubles is produced for every tonne of anhydrous ethanol produced. The entireproduction process at the plant requires 9.75 GJ of heat and 1.45 GJ (403 kWh) ofelectricity per tonne of anhydrous ethanol produced.The first energy supply option in the calculator simply generates the necessary heatusing a natural-gas fired boiler and imports the necessary electricity from the grid.The other options use combined heat and power (CHP) equipment sized to match theheat requirements of the plant, and produce varying amounts of surplus electricity.