Hasan Hüseyin Erdem

A Techno-Economical Evaluation for Installation of Suitable Wind Energy Plants in Western Marmara, Turkey

The increasing environmental concerns in recent years about global warming and the harmful effects of carbon emissions have created a new demand for clean and sustainable energy sources, such as wind, solar etc. Turkey has important wind energy potential especially in the Marmara region, coasts of western and southern Anatolia. However, utilization of this potential is still below the desired level. In this study, wind energy potential of Kirklareli province in the northwestern Marmara region of Turkey was analyzed. Economical evaluation of the wind energy in the site was made by using the levelised cost method. The energy production was determined by means of the time-series and Weibull approaches. The selected turbines for investigation are of various rated powers ranging from 300 kW to 2500 kW. The effect of hub height on the energy production was investigated for various hub heights. The results showed that the cost of energy production per kWh for the related site vary between ¢ 5.37 and 11.91. An increase in the escalation rate of the operating and maintenance cost from 0 to 10%, increases the unit energy cost about 6%. For the wind turbine of 2300 kW rated power, as the hub height increases from 80 to 100 m, the cost of energy decreases about 4%.

Determination of economic upper limit of drying processes in coal-fired power plants

ABSTRACT In this study, the economic assessment of coal drying prior to ga rinding mill process in coal-fired thermal power plants was carried out. In the literature, despite the fact that there are studies regarding drying systems, the advantages and disadvantages of these systems in comparison to each other and the benefits that drying will provide, and the economic factors that are the most important determinants in the practice of the drying system, were not adequately analyzed. In this study, on the other hand, a model was developed to determine the necessary critical cost point in order to identify the appropriate drying system. Through the use of this model, the benefits to be gained from the planned drying system and the financial upper limit required for this investment can be specified. As a model application, eight of the thermal power plants in Turkey were examined. The economic upper limit of a drying system to enable coal to be dried at a rate of 10% was determined through a model study carried out for Catalagzi Power Plant.

Effects of Bed Height and Particle Size on Drying of a Turkish Lignite

Drying of coarse lignite particles, because of high inherent moisture content, is very important for the lignite user. An effective drying process is necessary to utilize coarse lignite particles effectively. Fixed-bed drying experiments were carried out for a Turkish lignite (Konya-Ilgın). Effects of bed height and particle size were investigated. Drying experiments were carried out at 80, 130, and 150 mm bed heights and 20, 35, and 50 mm particle sizes. It was found that increasing the bed height increased the drying time and decreased the drying rate, and particles of larger sizes have lower drying rates and higher drying times. Additionally, it was also found that Konya-Ilgın lignite does not show a constant drying rate and has a long falling drying rate. As a result of this study, drying characteristics of Konya-Ilgın lignite were presented for different drying conditions.

Drying Characteristics of Coarse Low-Rank-Coal Particles in a Fixed-Bed Dryer

ABSTRACT In this study, a Turkish lignite (the Konya-Ilgın lignite) was used to study its drying characteristics in a fixed-bed dryer. The drying experiments were conducted with coarse lignite particles for utilization in the heating sector. In this study, the effects of the drying-air temperature and velocity were investigated. The particle sizes inside the bed were kept constant in the experiments, which was different from the previous works cited in the literature. The results showed that the drying-air temperature and velocity significantly influence the drying process. The drying time was reduced by increasing the air temperature and velocity. Additionally, drying of Konya-Ilgın lignite did not show an explicit constant-drying-rate stage. It showed the falling-drying-rate stage only despite containing more than 50% moisture by weight. This situation is different from most of the studies in the coal-drying literature.

Evaporative Drying of Low-Rank Coal

Low-rank coals including the brown and the subbituminous coals are commonly known to contain high moisture content (up to 65%, wet basis), which limits their utilization around the world in spite of their low cost. Today, the most of the drying technolo‐ gies are based on the evaporation of the water from the moist product. In this chapter, the most effective parameters on the evaporative coal-drying process are investigated with the data in the recent literature. The effective parameters are evaluated in three categories as follows: (1) the parameters about the drying media (the type of the media, the temperature, the pressure, the velocity and the relative humidity), (2) the coal parameters (the type of the coal and the size) and (3) the drying method.

Electricity Production Cost Analysis of a Combined Cycle Power Plant

Abstract In this study, thermoeconomic analysis of a combined cycle power plant (CCPP) is investigated. The aim of this study is to find the minimum electricity production cost (EPC). The variable parameters selected for the optimization are the compressor pressure ratio, turbine inlet temperature, isentropic efficiencies, discount rate, etc. In the analysis, all thermodynamic and thermoeconomic expressions are formulated as a function of these decision variables. Consequently, the developed model is solved and the conditions giving minimum unit EPC for each value of variable parameters are determined.

Energy Based Thermoeconomic Analysis of a Combined Cycle System with Steam Extraction (Cogeneration System)

This study presents a thermoeconomic analysis methodology to calculate unit energy (electricity and heat) production cost for a combined cycle system with steam extraction (cogeneration system). The aim of this methodology is to find the minimum energy production cost. Therefore, firstly, minimum electricity production cost is found by using annual levelized cost method for a combined cycle system which only produces electricity. Secondly, minimum heat production cost for a combined cycle system with steam extraction is calculated. Extracted steam causes the power loss in the steam turbine and reduces the income. So, heat energy production cost can be correctly determined. In the model, the fall of the income associated with the power loss is accepted as equal to heat energy cost, and heat energy production cost is formulated as a function of electricity energy production cost. Finally, the effect of different parameters like compressor pressure ratio and steam pressure on heat production cost is investigated. As a result, the outcomes of this study can provide a basis used for determination of the unit energy production costs for different energy production systems.

Thermodynamic and economic assessments of gas turbine inlet air-cooling by evaporative technique

In this study, the effects of gas turbine inlet air-cooling by evaporative technique on work output and thermal end exergy efficiency were analysed. These analyses are performed with the use of per unit volumetric flow, which is fixed regardless of atmospheric air conditions. In addition, a simple and effective model is developed for the economic analysis of evaporative cooling. As a case study, the payback periods of two different gas turbine models are calculated for eight different regions in Turkey. Depending on the technical, economic and environmental conditions, evaporative cooling may be suitable for the regions considered.

Emission Assessment for Cogeneration Systems

Abstract Cogeneration systems are important alternatives in reducing emissions due to the ability of generating both electricity and heat energy simultaneously from the same fuel. In this study, the reduction amounts of the most hazardous emissions such as CO2, NOx and SO2 with using different types of cogeneration systems have been analyzed. The main approach of this analysis determines the emission differences between cogeneration systems and separate power-heat systems in case of generating the same energy. In addition, the parameters affecting this emission reduction have been described. Consequently, limit conditions for emissions reduction have been determined and shown with a case study.

Fragmentation of a Turkish Low Rank Coal During Fixed-bed Evaporative Drying Process

In the present study, a new approach was utilized to investigate the fragmentation of low rank coal during the thermal drying process. Drying experiments were conducted at different drying air temp...