Research of the usable facilities of alternative fuels in the cogeneration power - station

With fossil fuel and supply of centralized energy getting more expensive combined electricity and heating production is spreading in the European Union using cogeneration plants. Such distributed energy generation has a range of advantages: a possibility to use local fuel rationally including fuel of biological nature, lower costs of energy production and distribution, lower environmental pollution and creation of new work places in rural areas. The carried aut analysis showed, that good perspectives are forecasted for using diesel engines in cogeneration plants, if they run on plant oil produced locally. The investigations proved that comparative consumption of mineral diesel fuel made 205š1.4 g/kWh, that of rape seed methyl ester - 225š2.6 g/kWh and plant oil - 230š1.8 g/kWh. The analysis of emissions showed that after changing mineral diesel fuel with pure RME or rape seed oil, a larger amount of NOx is emitted into the environment - 10% and 13% respectively. A comparative amount of CO in oxides while using pure RME decreases by 5.7%, compared with mineral diesel fuel, and using rape seed oil - by 6.3%. Economic calculations showed that capital investments for the erection of a cogeneration plant of 340 kW power would make 480 thou Lt. The operation of such plant would give 448.8 thou Lt of annual income for sold electric power and the production cost of produced heating energy would be 0.18 Lt/kWh

Chemical composition and total phenols content of tartary buckwheat (fagopyrum tataricum gaertn) grown in different vegetation seasons

Tartary buckwheat (Fagopyrum tataricum Gaertn) is an annual plant that is classified as a pseudocereal with high nutritional values. It is mainly cultivated in Asia, where grain and other parts of plants are used in traditional diet. In recent years, tartary buckwheat is grown on smaller areas and mostly in a mixture with common buckwheat in Bosnia and Herzegovina. The aim of this research was to determine the chemical composition and total phenols content of tartary buckwheat grown in different vegetation seasons. Field experiments were conducted in Donje Selo, near Ilijaš during 2011, 2012 and 2013 vegetation seasons. The results show that weather in some vegetation seasons have statistically significant effect on contents of protein and starch in kernel. The largest contents of protein were found in vegetation season with a lack of precipitation (2012 year), while the largest content of starch was recorded in years with relatively higher precipitation levels (2011 and 2013 years). Results show that total phenols content depended on the plant organ and vegetation season. The highest content was found in the flower (63.63 mg GAE g−1), while the smallest content was found in the kernel (5.03 mg GAE g−1)