THE NEW TARGETS OF 2020 FOR THE CONSTRUCTION OF RENEWABLE ENERGY POWER PLANTS IN SERBIA

At the end of 2012 and the beginning of 2013, the Serbian Government issued the new national regulations in order to provide an acceptable legislation framework to achieve 2020 targets of 27% increase of total renewable energy sources share in the gross final energy consumption, relative to 2009. The target of a 37% increase relates to participation of renewable energy sources in electricity production. It requires construction of new significant capacities of renewable energy power plants as clearly defined in the National Action Plan for Renewable Energy Sources.This paper comprises critical analyses of targeted new installed capacity of renewable energy power plants for electricity production from different point of views, such as: new national energy policy, new national regulations, renewable energy sources potential in Serbia, efficiency of power plants and the investment financial models.According to the new national energy policy identified in the National Action Plan for Renewable Energy Sources, it is concluded that the new regulations related to the construction of new renewable energy power plants is completed, particularly concerning the investment security, provision of green electricity market, status of green electricity producer, and significant reduction of time for administrative procedures required to obtain a building permit. Particularly, the real wind potential in Serbia, based on the measured data over the past ten years of measurement campaigns at more than thirty locations, has been used to correct the targeted installed capacity of wind power plants.At the end of 2012 and the beginning of 2013, the Serbian Government issued the new national regulations in order to provide an acceptable legislation framework to achieve 2020 targets of 27% increase of total renewable energy sources share in the gross final energy consumption, relative to 2009. The target of a 37% increase relates to participation of renewable energy sources in electricity production. It requires construction of new significant capacities of renewable energy power plants as clearly defined in the National Action Plan for Renewable Energy Sources.This paper comprises critical analyses of targeted new installed capacity of renewable energy power plants for electricity production from different point of views, such as: new national energy policy, new national regulations, renewable energy sources potential in Serbia, efficiency of power plants and the investment financial models.According to the new national energy policy identified in the National Action Plan for Renewable Energy Sources, it is concluded that the new regulations related to the construction of new renewable energy power plants is completed, particularly concerning the investment security, provision of green electricity market, status of green electricity producer, and significant reduction of time for administrative procedures required to obtain a building permit. Particularly, the real wind potential in Serbia, based on the measured data over the past ten years of measurement campaigns at more than thirty locations, has been used to correct the targeted installed capacity of wind power plants

Comparative analyses of built environment exposures relevant to health of greenhouse gas emissions reduction strategies in Serbia

Paper presents comparative analysis of residential indoor air pollutant concentration change over future specified time horizon, implementing building physical and thermal retrofit measures, thus creating pollution mitigation scenarios for existing Belgrade and Nis housing stock followed by greenhouse gas emission reduction scenarios up to 2050. Regarding specified mitigation scenarios, the set of typical housing unit models has been generated which define existing housing stock of Belgrade and Nis. Extensive monitoring of physical and thermal parameters as well as detailed socio-technical survey of selected households was performed and used as an initial modeling input. Relationship between environment pollution and building performances was investigated, with respect to indoor-outdoor sources of pollution, thermal and physical properties of the stock samples and occupant's behavior. As a final output, indoor pollutant concentrations for each of the modelled cases was obtained and validated against the available data. This housing modelling framework has been created in order to develop an assessment of present and future exposure and health impact quantity regarding single/multiple scenario interventions introduced to the housing stock. This paper provides each strategy guidelines for taking measures towards achieving the healthier indoor environments

Research in the fluidized bed combustion in the Laboratory for thermal engineering and energy - Part A: Achievements in targeted fundamental research

The paper gives a review of the most important results of extensive targeted fundamental research program on fluidized bed combustion in the Laboratory for Thermal Engineering and Energy of the VINCA Institute of Nuclear Sciences. The paper presents a detailed overview of research activities from the beginning in the second half of the 1970'' up to present days. Starting with the motives for initiating the investigations in this field, the paper highlights various phases of research and points out the main results of all research activities, not only the ones that are focused in this paper. Targeted fundamental research topics that are overviewed in this paper are heat and mass transfer, coal particle fragmentation, char particle combustion, sulfur self-retention by coal ash itself, as well as circulating fluidized bed modeling

Research in the fluidized bed combustion in the Laboratory for thermal engineering and energy - Part B: Achievements in technology implementation

Paper gives a review of the most important results of extensive and wide-ranging research program on R&D of fluidized bed combustion technology in the Laboratory for Thermal Engineering and Energy of the VINCA Institute of Nuclear Sciences. Paper presents detailed overview of R&D activities from the beginning in the second half of the 1970's up to present days. These activities encompass applied research achievements in the field of characterization of limestones and bed agglomeration and sintering and modeling of overall processes during fluidized bed combustion, all of which have facilitated the R&D of the fluidized bed combustion technology. Attention is also given to steady-state combustion testing of a wide-range of fuels (coals, liquid fuels, biomass, waste solid and liquid materials, etc.) in our fluidized bed combustor and development of original methodology for testing the suitability of fuels for fluidized bed combustion, as well as specific achievements in the area of technology application in Serbia

Three phase eulerian-granular model applied on numerical simulation of non-conventional liquid fuels combustion in a bubbling fluidized bed

The paper presents a 2-D CFD model of liquid fuel combustion in bubbling fluidized bed. The numerical procedure is based on the two-fluid Euler-Euler approach, where the velocity field of the gas and particles are modeled in analogy to the kinetic gas theory. The model is taking into account also the third liquid phase, as well as its interaction with the solid and gas phase. The proposed numerical model comprise energy equations for all three phases, as well as the transport equations of chemical components with source terms originated from the component conversion. In the frame of the proposed model, user sub-models were developed for heterogenic fluidized bed combustion of liquid fuels, with or without water. The results of the calculation were compared with experiments on a pilot-facility (power up to 100 kW), combusting, among other fuels, oil. The temperature profiles along the combustion chamber were compared for the two basic cases: combustion with or without water. On the basis of numerical experiments, influence of the fluid-dynamic characteristics of the fluidized bed on the combustion efficiency was analyzed, as well as the influence of the fuel characteristics (reactivity, water content) on the intensive combustion zone

Influence of non-uniformity of coal and distribution of active calcium on sulfur self-retention by ash - A case study of lignite Kolubara

Self-retention Of SO2 by ash of different grades of Kolubara lignite was experimentally investigated in a laboratory furnace. The peculiarity of this type of coal is that in the open pit there are distinct layers of coal and ballast matter, which complicates the formation of representative samples. Two grades of this coal (differing in ballast matter content) were investigated using 3 sieved fractions: 1-1.6 mm, 2.5-3.15 mm, and 4.76-7 mm. It was found that particle size had no significant effect on the sulfur self-retention efficiency (etaSO(2)). The effect of ballast matter content on etaSO(2) was investigated by classifying two sieved fractions into classes with different density ranging from LT 1000 kg/m(3) to GT 1600 kg/m(3). It was found that most of sulfur self-retention occurs in less dense particles., For this coal only 60% of the total calcium was found to be active in relation to sulfur self-retention capability. Most of the active calcium and sulfur were found to be present in particles of lower density, which explains their dominant contribution to overall sulfur self-retention

Correlation for the total sulfur content in char after devolatilization

The overall process of coal combustion takes place in two successive steps: devolatilization and char combustion. The fate of sulfur during the devolatilization of coal of different rank was investigated. The significance of the investigation is in fact that a major part of sulfur release occurs during devolatilization of coal, (i.e., emission of sulfur oxides during combustion of coal largely depends on sulfur release during devolatilization). The experimental investigations were conducted to obtain the data about the quantitative relation between sulfur content in the coal and sulfur content in the char. Standard procedures were used for obtaining the chars in a laboratory oven and determining the sulfur forms in the coal and char samples. The experiments were done with grounded coal samples ( LT 0.2 mm), at the temperatures in the range of 500-1000 degrees C. We showed that the amount of sulfur remaining in the char decreases, but not significantly in the temperature range 600-900 degrees C. On the basis of the theoretical consideration of behavior of sulfur forms during devolatilization, certain simplifying assumptions, and obtained experimental data, we propose two correlations to associate the content of sulfur in the coal and in the char. The correlations are based on the results of the proximate analysis and sulfur forms in coal. Good agreement was found when the proposed correlations were compared with the experimental results obtained for investigated coals. Moreover, the correlations were verified by results found in the literature for numerous Polish, Albanian, and Turkish coals. Significant correlations (P LT 0.05) between observed and calculated data with correlation coefficient, R GT 0.9, were noticed in the case of all coals