EL GAS NATURAL COMO COMBUSTIBLE INDUSTRIAL
4.3. QUEMADORES A GAS NATURAL 1 Funciones y Condiciones Básicas
The results presented are for selected environmental impacts of heat and power
production from short rotation wood. Although typical examples for SRC cultivation and combustion were chosen for modeling, the results vary according to the underlying assumptions. Power plant efficiency, plant operation and the amount of heat used have a strong influence. Impact values are also determined by allocation, which depends on the inherent exergy which represents the importance of both products. Heat production per MJ of electricity produced varies according to the operational management of the CHP. When emissions from the total energy produced are compared per MJ it becomes apparent that the emissions rise with decreasing overall plant efficiency. Because of adjusted
assumptions about CHP plant efficiencies, the results presented here differ from those in a previous paper (Rödl, 2010). 0 20 40 60 80 100 120 140 160 180 200
Fuel mix, grid SRC 70% SRC 34% SRC 70% fert. SRC 34% fert.
g CO 2 -‐e q. M Jel -‐1
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Life cycle impacts are also sensitive to changes in rotation length and biomass growth rates. If more biomass were produced per hectare, impacts per functional unit would decrease. If soil carbon changes in agricultural soils were included in the assessment, CO2-
emissions from biomass production and distribution would be overcompensated by this carbon uptake. The impacts of short rotation plantation cultivation on a large scale have not been assessed within this study. Plantation scale could have an influence on water balance, species composition, biodiversity and nutrient cycling at the landscape level. Comparison of GWP scores for SRC to those for electricity from the grid helps quantify the relationship of bioenergy to conventional energy production. However, it provides no information on marginal effects of bringing SRC electricity onto the market. Reductions in GHG emissions will be greater if inefficient fossil power plants with high CO2 emissions are
replaced. Such reductions might be less if cleaner technologies would be replaced.
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