Study of solar hybrid combined cycle power plant

Pollution and increasing fuel prices are the main focus for governments today. The main cause of pollution is existing electricity power plants that use huge quantities of fossil fuel. A new strategy should be applied in the coming decades based on the integration of existing power plants with renewable energy sources, such as solar and wind energy. Hybridization of existing power plants with solar energy is one proven option to overcome the problems of pollution and increasing fuel prices. In this paper, a review of the previous studies and papers for integrating solar thermal energy with conventional and non-conventional power plants was carried out. The focus on hybrid solar conventional power plants includes: the review of studies of hybrid solar-steam cycle power plants, integrated solar combined-cycle systems (ISCCS) and hybrid solar-gas turbine power plants, while for hybrid solar non-conventional power plants the focus of study is hybrid solar-geothermal power plants. The most successful option is ISCCS due to their advantages and the plans for implementation at various power plants in the world like in Tunisia, Egypt, Spain, and Iran.

SAMRIDDHI : A Journal of Physical Sciences, Engineering and Technology

The present paper reviewed the studies of the hybrid solar-biomass power plants. Based on renewable energy, several configurations of hybrid power cycles are discussed and summarized. It includes the technical, economical, and environmental aspects of the hybrid solar-biomass plant, how the hybrid power plant works, and the essential resources required for the setup and running of the hybrid solar biomass plant. The advantages and disadvantages associated with the single renewable resource-based power plants are also discussed. The hybrid power plants help rectify the disadvantages over single resource plants, improve the power production rate of the plant, and help it run over seasonally. The present paper also discussed the solar and biomass potential in the Indian context and compared the progress of the hybrid solar-biomass power generation system with other countries.

Sustainable Energy Technologies and Assessments, 2020

This paper introduces a new combination of solar fields to reduce LCOE and increase solar share. One Solar Field (PTC or LFR) with molten salt as heat transfer fluid is used to store energy during the day, and two independent LFRs are used for direct steam generation for high-pressure turbines and low-pressure turbines. Due to the low price of natural gas, using solar field is not economical, and using thermal energy storage is affordable only for a higher price of natural gas. The PTC with a lower energy storage than LFR has a higher solar share, but using LFR is more economical. In this paper, the effects of several parameters on the LCOE are investigated, and the key factors are introduced. According to the results, three independent LFRs create the best combination to meet the required energy. The LCOE of a photovoltaic power-plant is less than the LCOE of a solar thermal one, but the photovoltaic power plant cannot supply the energy needed at night. Therefore, in the end, to further increase system performance and reduce the LCOE, the solar thermal power-plant is combined with a photovoltaic system and the effects of using different sizes of photovoltaic power-plant on the hybrid system are investigated.

Solar Energy, 1998

The main results of a feasibility study of a combined cycle electricity generation plant, driven by highly concentrated solar energy and high-temperature central receiver technology, are presented. New developments in solar tower optics, high-performance air receivers and solar-to-gas turbine interface, were incorporated into a new solar power plant concept. The new design features 100% solar operation at design point, and hybrid (solar and fuel ) operation for maximum dispatchability. Software tools were developed to simulate the new system configuration, evaluate its performance and cost, and optimize its design. System evaluation and optimization were carried out for two power levels. The results show that the new system design has cost and performance advantages over other solar thermal concepts, and can be competitive against conventional fuel power plants in certain markets even without government subsidies.

2002

A new concept of small hybrid solar power system (HSPS) has been successfully demonstrated in the context of a project called SPS (Solar Power System). This plant integrates two rows of solar collecûors, two superposed Organic Rankine Cycles (ORC) each equipped with a scroll hermetic expander-generator and a heat engine. In operation with solar energy only, the heat is supplied by a thermal fluid (presently pressurized water) heated in the vacuum insulated focal tubes of sun following, flat concenfrators made of series of thin plate mirrors (CEP). In hybrid mode additional heat is supplied by heat rccovery from the exhaust gases of the engine in series with the solar network and by a separate network recovering heat from the cooling of the engine block at an intermediate temperature level. This paper presents the results of a multi-criteria optimization of a 22 kWe HSPS, including aspects such as energy performance, economic and financial analysis, and environmental aspects. The so called minimaxi methodological approach with genetic algorithm is used considering three principal siteria such as the energy efficiency of the superposed ORCs, the minimal cost of the installation and the minimum emission of COr. Taking into account of the solar radiation time dependence, the electricity supply variation and the change of configuration (night and day operation), the performance analysis is based essentially on the yearly energy simulation in which the offdesign physical models of components are considered. A comparison of HSPS with pure fossil fuelled Plants (DEPU-Diesel Engine Power Unit) is reported for the same electrical power load curve, with an economic sensitivity analysis. Results show that the solar elecnicity costs are still high and depend considerably on the size of the Solar Field (the HSPS laevelized Electicity Cost with 5 to l6Vo of annual solar share is about ITVo to 49Vo higher than a similar size Diesel Engine PowerUni|.However, areduction of CO, emission tp to 26Vo could be obtained when replacing the Diesel Engine Unit by a similar HSPS. Those hybrid solar thermal power systems may already be compettive if a tax of about 42 Swiss cts /kgCO, would be considered.

In today’s world, electricity is mostly generated from coal based thermal power plants that used coal as its primary fuel. In spite of an increase of the renewable power into the grid, Coal based Thermal power plants are going to rule the power generation sector in the future to meet the fast growing power needs of the country. Solar energy is one of the easily available sources of renewable energy and could be used to increase the effectiveness of steam power plants. This paper establishes that the fuel saving in coal-fired Power plant by integrating solar energy to increase the temperature of the feed water entering the boiler. As a result, the amount of fuel required to heat the feed water within the boiler to produce steam is reduced. This plant model incorporates a field with solar Fresnel collectors that directly heats boiler feed water. The proposed plant model modification saves substantial fossil fuel input reduction. The best results can be acquired when the group of high pressure heaters (HPH) is replaced by solar field and feed water temperature exceeds its original design value. So it required less amount of heat input from the boiler. A pulverized coal power plant is one of the main CO2 release resources. The integration of the solar field into a pulverized coal power plant assists it to reduce the coal consumption and CO2 emissions.

The oil shocks of 1970s led to spiraling crude oil prices in the world market which prompted planners to view energy security as an issue of national strategic importance. Energy security has an important bearing on achieving national economic development goals and improving the quality of life of the people. World's dependence on crude oil will continue for most part of the 21st century but the continued dependence on crude oil is loaded against it with inherent price volatility linked to finite global reserves. In addition, global warming, caused largely by greenhouse gas emissions from fossil fuel energy generating systems, is also a major concern. So, there is a need to develop alternate fuels like non-conventional sources, considering the aforesaid two concerns. This paper describes about the hybrid (solar + wind energy) systems, one of the non-conventional sources and different ways of using it to convert to electric energy. This gives energy continuously around the clock. Hybrid systems are use full for all atmospheric conditions for producing energy at moderate cost.

The Integrated Solar Combined Cyclesnow a day themostefficientsystemforconvertingsolarenergyintoelectricityamongallthehybridsolarthermaltechnologiesavaila ble. A parabolic trough solar field is coupled with a conventional combined cycle in this power plant. The performance ofanISCCplantunder southern state of Indiahasbeeninvestigatedinthisarticle. To that end, a thermodynamic model has been created to assess the intensity of solar radiation as well as the overall performance of the hybrid solar power plant.During bright periods, solar to power efficiency could reach 15.4 percent, according to the study. Furthermore, a 60 percent overall thermal efficiency is possible. Several operation characteristics, including as the time of day, the mass flow rate of the heat transfer fluid, and the angle of incidence on the collector surface, have also been discovered to improve the quantity of electricity produced.

Recep Tayyip Erdoğan Üniversitesi Fen ve Mühendislik Bilimleri dergisi, 2022

The importance of solar energy is increasing day by day for humanity, considering the increasing environmental pollution with the intensive use of fossil fuels in recent years. While the importance of solar energy is increasing, the development and effective use of existing solar energy systems are also important. There are many systems in which solar energy is used directly or indirectly. Solar chimney power plants (SCPP) are systems that indirectly generate electricity from the sun by transferring solar energy to the air in its structure. It is promising with its low maintenance costs and environmentally friendly working principles after its installation. This study firstly explains the working principle of the system to the readers and then evaluates the parameters that affect the performance of the system. The effect of the collector and chimney, which are the main elements of the system, on the performance of the system in different geometries and designs is interpreted based on the literature. Then, it refers to the innovative studies carried out in recent years regarding the system. As a hybrid system, studies such as adding PV modules to SCPP systems, adding geothermal and external heat sources, desalination of seawater, and obtaining clean water are included. The effect of hybrid systems on performance is evaluated. It is seen that the power output of the system reaches satisfactory levels with PV, geothermal, and external energy source reinforcement. In addition, its use for different purposes such as obtaining clean water is promising.

Power and Energy Systems, 2010

Botswana currently depends on electricity generated from coal-based power plant or electricity supplied from the border in South Africa. The country has good reserves of coal and the solar radiation is sufficiently high to make solar thermal attractive for generating electricity. The paper presents two conceptual coal-fired power station designs in which a solar subsystem augments heat to the feed heaters or to the boiler. The thermal and economic analyses showed enhanced system performance which indicates that solar power could be embedded into existing fossil fuel plants or new power stations. Integrating solar energy with existing or new fossil fuel based power plants could reduce the cost of stand-alone solar thermal power stations, reduce CO 2 emissions and produce experience necessary to operate a full scale solar thermal electricity generation facility.