Study on a New Solar Thermal Energy Complementary Power Generation System Based on Gas-Steam Combined Cycle

2019 ◽  
Author(s):  
Duan Liqiang ◽  
Lv Zhipeng ◽  
Wang Zhen
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Thermal Efficiency ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Solar Thermal ◽  
Solar Power Generation ◽  
Cycle System ◽  
Solar Energy Utilization ◽  
New System

Abstract The integrated solar energy-driven chiller combined cycle system (SCCC) has a problem of low annual solar energy utilization. The solar thermal efficiency and power output of the traditional integrated solar combined cycle system (ISCC) are limited by the integrated solar mirror field area and Rankine cycle efficiency. This paper presents a new system, on the basis of the combined cycle system with the three pressure HRSG with reheat, the solar energy is integrated into the chiller for cooling the compressor inlet air of gas turbine and the heat recovery steam generator (HRSG) for increasing the power output simultaneously. The Aspen Plus, TRNSYS and EBSILON softwares are applied in this paper to build the models of the overall system. The solar thermal efficiency, annual solar power generation and annual solar thermal efficiency are used to evaluate the performances of the new system, the traditional ISCC system and SCCC system. During the summer solstice, the proportions of solar energy used in cooling and heating are set as 40% and 60% in new system, respectively. The research results show that the new system has a higher power output (406.37MW), thermal cycle efficiency (53.61%) and solar thermal efficiency (48.85%) compared with the traditional ISCC system (385.63MW, 51.67%, and 24.43%, respectively) at the design point. The new system can regulates the proportions of solar energy used in the chiller and HRSG based on the monthly meteorological data, in order to maximize the annual solar energy utilization and annual solar power generation. The new system’s annual solar energy utilization hours (2071h) and solar power generation (25.863GW·h) are far greater than those of SCCC system (1498h, 18.185GW·h, respectively). Therefore, the proposed new system with the simultaneous integrations of solar energy with both the chiller and HRSG not only greatly increases the utilization rate of solar energy, but also has the significant thermodynamic advantages.

scholarly journals Study of an Integrated Tower Solar Energy Combined Cycle System with the Simultaneous Integration Solar Energy with Top and Bottom Cycle

2019 ◽  
Vol 2 (4) ◽  
Keyword(s):  
Solar Radiation ◽  
Solar Energy ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Summer Solstice ◽  
Operating Characteristics ◽  
Cycle System ◽  
Collector System ◽  
Simultaneous Integration ◽  
New System

In this paper, based on a conventional integrated solar combined cycle system (ISCC), a novel integrated tower solar energy combined cycle system (ITSCC) with the simultaneous integration the solar energy with top and bottom cycle of combined cycle system is proposed. The system models are developed and different system performance evaluation indices are proposed. Then in the condition of the same solar radiation the thermal performance of new system is analyzed and compared with the reference ISCC system and gas-steam combined cycle (GTCC) system. Furthermore, the operating characteristics of the new system in the summer solstice are deeply investigated in consideration of the heat variation from direct solar radiation and the effect of the ambient temperature change on the solar collector system. The efficiency of solar energy utilization and the thermodynamic properties of different systems are analyzed. The result shows that, in the summer solstice the natural gas input of new system is less 3.28% than that of GTCC system and the net output power is increased by 1.5%, the solar-to-electric efficiency and the exergy efficiency can achieve 27.3% and 28.4%, respectively. In addition, the annual performance of new system is also better than that of the reference system.

scholarly journals Performance Study of a Novel Integrated Solar Combined Cycle System

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3400 ◽  
Author(s):  
Liqiang Duan ◽  
Zhen Wang
Keyword(s):  
Solar Energy ◽  
Meteorological Data ◽  
Lithium Bromide ◽  
Combined Cycle ◽  
Air Cooling ◽  
Absorption Refrigeration ◽  
Performance Study ◽  
Levelized Cost Of Electricity ◽  
Cycle System ◽  
New System

Based on a traditional integrated solar combined cycle system, a novel integrated solar combined cycle (ISCC) system is proposed, which preferentially integrates the solar energy driven lithium bromide absorption refrigeration system that is used to cool the gas turbine inlet air in this paper. Both the Aspen Plus and EBSILON softwares are used to build the models of the overall system. Both the thermodynamic performance and economic performance of the new system are compared with those of the traditional ISCC system without the inlet air cooling process. The new system can regulate the proportions of solar energy integrated in the refrigerator and the heat recovery steam generator (HRSG) based on the daily meteorological data, and the benefits of the solar energy integrated with the absorption refrigeration are greater than with the HRSG. The results of both the typical day performance and annual performance of different systems show that the new system has higher daily and annual system thermal efficiencies (52.90% and 57.00%, respectively), higher daily and annual solar photoelectric efficiencies (31.10% and 22.31%, respectively), and higher daily and annual solar photoelectric exergy efficiencies (33.30% and 23.87%, respectively) than the traditional ISCC system. The solar energy levelized cost of electricity of the new ISCC system is 0.181 $/kW·h, which is 0.061 $/kW·h lower than that of the traditional ISCC system.

scholarly journals HYDROGEN PRODUCED BY SOLAR ENERGY AND THEIR USE AS CLEAN FUEL FOR POWER GENERATION IN A COMBINED CYCLE POWER PLANT

2016 ◽  
Vol 15 (1) ◽  
pp. 41
Author(s):  
J. C. Restrepo ◽  
O. J. Venturini ◽  
E. E. Silva ◽  
L. A. Cortabarria
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Solar Energy ◽  
Electricity Generation ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Main Process ◽  
Clean Fuel ◽  
Combined Cycle Power Plant ◽  
Production Of Hydrogen

The solar energy is one of the most promising energy sources expected for the future, due at their huge potential and the wide availability around the world. However, nowadays this important source of energy is not being harnessed or even addressed in their full potential. According to the last statements, it is important to develop solar energy conversion systems of high efficiency, as well as spreading its use in other forms besides the traditional systems of electric power generation or heating systems. For this reason, in this paper, it is explored the production of hydrogen through solar energy utilization, and the later electrical energy production by burning the produced hydrogen in a combined cycle power plant. The process was modelled for 3 MWe of electricity generation, and using the organic Rankine cycle. The main process for producing hydrogen from water using solar energy is based on a two steps redox thermochemical cycle, which has a theoretical conversion efficiencies of 54% at 1600 K. It is expected that this paper could contributed to the development of ways to enable a better integration of the solar energy with the current electricity generation technologies, as well as to incentive the use of the hydrogen as a clean fuel.

A Review on Hybrid Solar Power System Technology

2013 ◽  
Vol 281 ◽  
pp. 554-562 ◽  
Author(s):  
Ting Ting Li ◽  
Guo Qiang Xu ◽  
Yong Kai Quan
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Power System ◽  
Solar Power ◽  
Thermal Power ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Cycle System ◽  
Grid Connection ◽  
Power Generation Technology

Solar energy utilization has met some complicated problems in recent years, like energy storage, solar thermal power generation dispatchability and grid connection etc. The concept of hybrid solar power systems proposed in early researches has extended the conditions of exploiting solar power generation technology，this paper reviews hybrid solar power system technologies in the past 40 years. According to different complementary energy resources, hybrid solar/renewable energy and solar/conventional energy systems have been discussed in this paper. Particularly, this article presents the thermal and economic performances of Integrated Solar Combined Cycle System (ISCCS).

scholarly journals Leveraging Energy Storage in a Solar-Tower and Combined Cycle Hybrid Power Plant

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 40 ◽  
Author(s):  
Kevin Ellingwood ◽  
Seyed Safdarnejad ◽  
Khalid Rashid ◽  
Kody Powell
Keyword(s):  
Solar Activity ◽  
Power Plant ◽  
Solar Energy ◽  
Combined Cycle ◽  
Energy Utilization ◽  
Base Case ◽  
Solar Fraction ◽  
Charging Rate ◽  
Solar Energy Utilization ◽  
Collector Temperature

A method is presented to enhance solar penetration of a hybrid solar-combined cycle power plant integrated with a packed-bed thermal energy storage system. The hybrid plant is modeled using Simulink and employs systems-level automation. Feedback control regulates net power, collector temperature, and turbine firing temperature. A base-case plant is presented, and plant design is systematically modified to improve solar energy utilization. A novel recycling configuration enables robust control of collector temperature and net power during times of high solar activity. Recycling allows for improved solar energy utilization and a yearly solar fraction over 30%, while maintaining power control. During significant solar activity, excessive collector temperature and power setpoint mismatch are still observed with the proposed recycling configuration. A storage bypass is integrated with recycling, to lower storage charging rate. This operation results in diverting only a fraction of air flow to storage, which lowers the storage charging rate and improves solar energy utilization. Recycling with a storage bypass can handle larger solar inputs and a solar fraction over 70% occurs when following a drastic peaking power load. The novel plant configuration is estimated to reduce levelized cost of the plant by over 4% compared to the base-case plant.

Solar Energy Utilization in Externally Fired Humidified Air Turbine System

Solar Energy ◽  
2003 ◽  
Author(s):  
Hongbin Zhao ◽  
Hongguang Jin ◽  
Ruixian Cai
Keyword(s):  
Power Generation ◽  
Solar Energy ◽  
Latent Heat ◽  
Thermal Power ◽  
Dew Point ◽  
Energy Utilization ◽  
Heat Utilization ◽  
Solar Energy Utilization ◽  
Air Turbine ◽  
Humidified Air

In this paper we propose a new system of solar energy power generation with an external fired humidified air turbine (EFHAT). In the EFHAT, the latent heat from the exhausts gas of gas turbine can be utilized to increase ability of humidification of air due to no limitation of dew point temperature with clean humid air. Through absorbing the solar energy, the water from the collector is brought to the saturator to enhance air humidification ability with the latent heat being more utilized in the EFHAT system. Through integration with EFHAT and latent heat utilization based on integration of the fossil and the renewable energy utilization, the performance of the new proposed solar energy utilization system might be superior to traditional solar energy power generation systems. As a result, the thermal efficiency of the solar thermal power generation will be 16∼20%, superior to conventional solar power generation system (generally about 13%); while the latent heat utilization ratio gets about 25∼35%. This will be a new way of solar energy utilization.

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