Investigation the Integration of Heliostat Solar Receiver to Gas and Combined Cycles by Energy, Exergy, and Economic Point of Views

Abstract

Due to the high amount of natural gas resources in Iran, the gas cycle as one of the main important power production system is used to produce electricity. The gas cycle has some disadvantages such as power consumption of air compressors, which is a major part of gas turbine electrical production and a considerable reduction in electrical power production by increasing the environment temperature due to a reduction in air density and constant volumetric airflow through a gas cycle. To overcome these weaknesses, several methods are applied such as cooling the inlet air of the system by different methods and integration heat recovery steam generator (HRSG) with the gas cycle. In this paper, using a heliostat solar receiver (HSR) in gas and combined cycles are investigated by energy, exergy, and economic analyses in Tehran city. The heliostat solar receiver is used to heat the pressurized exhaust air from the air compressor in gas and combined cycles. The key parameter of the three mentioned analyses was calculated and compared by writing computer code in MATLAB software. Results showed the use of HSR in gas and combined cycles increase the annual average energy efficiency from 28.4% and 48.5% to 44% and 76.5%, respectively. Additionally, for exergy efficiency, these increases are from 29.2% and 49.8% to 45.2% and 78.5%, respectively. However, from an economic point of view, adding the HRSG increases the payback period (PP) and it decreases the net present value (NPV) and internal rate of return (IRR).

Energy, Exergy, Economic, and Exergoenvironmental Analyses of a Novel Hybrid System to Produce Electricity, Cooling, and Syngas

“…The efficiency of the ORC turbine and pumps are considered to be 85% [39,41] • For the heat exchanging components such as the condenser and the evaporator, energy effectiveness is assumed to be 85% [1,39] •…”

“…Heat loss of components is assumed around 3% of the energy released by the hottest steam at these components [1,39] The solar radiation and wind turbine modelling are presented in Appendix A.…”

“…The performance of the electrolyzer can be obtained from the following equation [42][43][44]: Terminol VP-1 passes through a solar dish collector to absorb the solar radiation heat (1). A thermal energy storage tank is used to attenuate the fluctuations of solar radiation and for the system's operating even during the night and to the operating fluid reach the desired temperature.…”

“…Increasing energy demand, fossil fuel depletion, and environmental concerns with the use of fossil fuels drive the present society towards renewable energy use [1][2][3][4][5]. Abundant in nature and renewable, solar energy has been increasingly used in recent decades [3,[6][7][8].…”

Thermodynamic Optimization of a Geothermal Power Plant with a Genetic Algorithm in Two Stages

“…Several studies have been reported in recent years on energy, exergy, economic and environmental analyses, and optimization of various power generation systems, including combined heat and power, renewable energy, and other plants [19][20][21][22][23][24][25][26][27].…”