Burhanettin Cetin

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.

An Economic Model for the Revamping of a Pulverized Coal-fired Boiler

Equipping existing thermal power plants (TPPs) with newer technologies, such as fluidized bed combustion (FBC), is vital for many countries due to concerns about the economy, the environment, and energy policy. First, this study presents a general model for economic analysis of the revamping of a pulverized coal-fired boiler with FBC. Second, the developed model is applied to a 140 MW pulverized coal-fired TPP. Third, the payback period (PBP) is calculated by using the net present value (NPV) method. Finally, the effects of almost all technical and economic parameters, such as power loss, electricity price, and escalation rate are investigated on PBP and NPV. As a result, the outcomes of this study show that power loss has a significant effect on PBP and NPV.

Economic Analysis for Rebuilding of an Aged Pulverized Coal-Fired Boiler with a New Boiler in an Aged Thermal Power Plant

Fossil-fired thermal power plants (TPP) produce a significant part of electricity in the world. Because of the aging TPPs and so their equipment (especially boiler), thermal power plants also produce less power than their installed capacities, and there has been power loss in time. This situation affects the supply and demand balance of countries. For this reason, aging equipments such as pulverized coal-fired boiler (PCB) must be renewed and power loss must be recovered, instead of building new TPPs. In this study, economic analysis of rebuilding an aged pulverized coal-fired boiler with a new pulverized coal-fired boiler including flue gas desulfurization (FGD) unit and a circulating fluidized bed boiler (FBB) are investigated in an existing old TPP. Emission costs are also added to model, and the developed model is applied to a 200 MWe pulverized coal-fired thermal power plant in Turkey. As a result, the payback period and the net present value are calculated for different technical and economic parameters such as power loss, load factor, electricity price, discount rate, and escalation rate by using the annual value method. The outcomes of this study show that rebuilding of a pulverized coal-fired boiler with a new one is amortized itself in a very short time.