The use of renewable energy sources is imposed as an imperative for the competitiveness and stable energy policy of companies. The basic production equipment in the "Kreka" coal mine in Tuzla has electrical plants with a total peak load of 12 MW, and the costs for electrical energy exceed €3.5 million annually. The paper analyzes the suitability of infrastructure facilities and devastated areas of the Kreka Coal Mine in Tuzla for the construction of photovoltaic power plants and the effects of such plants. The results of the analysis show a significant resource for the installation of photovoltaic power plants with a capacity of 230 MW. The production of electricity from these photovoltaic power plants enables a reduction of emissions into the air by 190 t/year of particle emissions, by 316.2 •103 t/year of CO2 emissions, by 58.15 t/year of SO2 emissions and by 251.9 t/year of emissions NOx. With the subsidized purchase of electricity, it is possible to return the investment within 6 years.

Determination of multiphase flow inside PC boiler plant is of particular importance for the process control of the boiler and its efficient operation. Nowadays numerical modeling is used as an advanced tool in improvement of this or similar process. Separation of coal particle in aero-mixture channel, after pulverization, represent an important process which has a big effect on boiler efficiency, and its determination represents an important step. In this paper, numerical modeling of multiphase flow inside aero-mixture channel and low emission burner of boiler OB-650 are exposed in several steps from 3D modeling, discretization of fluid domain, setting the physical and mathematical model to validation of same model. Main goals of the same process is to obtain valid numerical model of observed problematic, that will give us data about model parameters that can be used for modeling of the same process with different inlet boundary conditions, and also to obtain appropriate specific process parameters that can be used for rising of level of efficiency and utility of boiler plant in some steady operating modes.

The modern project solution, which has been implemented on the coal combustion system in Thermal Power Plant Tuzla Unit 6, has enabled the application of low emission concept of combustion and reduction of ash slugging on walls of combustion furnace, but analysis of the operation of boiler has shown significant deviations of the characteristic operating parameters obtained by the exploitation measurements compared to their design values. Previous CFD analysis that has been conducted on the aero-mixture channel and low emission burner has shown that current system of aero-mixture separation has a complex impact on combustion process inside the furnace. In order to determine the scope of the proper coal distribution in the specific boiler furnace on the combustion process, results of previous CFD analysis in combination with data obtained with classical mathematical models, have been used as inlet data for CFD simulation of combustion process. Obtained results in this paper should enable better understanding of combustion process, determination of critical process parameters that have main impact on efficiency of the boiler and its service life. From CFD results it’s clear that shape and position of flame depends on operating mills configuration and coal rate distribution per coal burner height.

Velocity of solid particles in aero-mixture channel has been recognized as the most significant factor that has an influence on erosion. In this paper, numerical study of particle erosion in aero-mixture channel was conducted due to the main parameters that have the greatest impact. Pulverised coal boiler OB650 is supplied with an aero-mixture (pulverised coal and flue gases) through distribution channels, 2358 Amel Mešić et al. where the distribution of the same aero-mixture is regulated with a tilt of regulation dumper. These types of regulation cause the problems that have greater impact on the internal structure of the same distribution channels. It is concluded that the best way to determinate that problems is with CFD tool. In this case CFD tool was used to simulate the flow field inside the channel, using EulerLagrangian mathematical approach.

The article shows cognitive-behavioral therapy of depressive disorder. Cognitive-behavioral treatment of depression is highly structural, practical and successful intervention which treats depression through finding out of behaviour and patterns of thoughts which cause depression. Interventions which are generally used in the treatment of depression involve planning of the chart of activities, prediction of joy and gradual tasks, training of social skills and assertiveness, consolidation, asking about and changing of negative automatic thoughts, assumptions and schemata, deduction and changing of plans, examination of disfunctional thoughts connected with despair. Some of techniques used in this case are: abdominal breathing, keeping a diary of activities with notes of programme of activity and mood in a week, planning of programme in a week: prediction of pleasure and achievements, self-observation of food taking in and making of plan for meals, psychoeducation, cognitive restructuring, reduction of self-critic and increase of self-respect, then construction of affirmation and writing them down.

The dryer in which drying of material is being done by rotation moving of the drying stands around which hot air is streaming represents an innovative technical solution. Counter-streaming movement of the rotor with drying stands through the stream of hot air enables a higher drying intensity. In order to get a clearer picture of the hot air streaming among the drying stands and the effects of the individual components on the streaming of fluid through rotary dryer, it is necessary to perform a detailed CFD analysis.