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This study investigates a novel supercritical carbon dioxide Brayton cycle with a bleeding anabranch used in coal-fired power plants. For the proper utilization of the medium-low temperature heat in the boiler, the coupling between the air-preheater and the cycle is concentrated. After analyzing the distribution of heat duty in the boiler, the flow diagram of the Brayton cycle is design. Subsequently,...
This work proposed and analyzed an integrated solar hybrid system for upgrading and utilization of low-rank coals using coal pre-drying, low-temperature pyrolysis and power generation, efficiently converting the low-rank coal into exportable value-added coal while generating electric power locally. The collected solar energy could be utilized in a cascade way to feed coal pre-drying and low-temperature...
Solar aided (coal-fired) power generation (SAPG) which is an efficient way to integrate solar thermal energy into normal coal fired power generation can reduce standard coal consumption rate (SCCR) for the coal fired power station and enhance solar-to-electricity efficiency (SEE) compared with solar alone thermal power generation. A SAPG model has been developed to study the energy and economic benefits...
Solar tower aided coal-fired power generation system (STCG) is able to provide high solar utilization efficiency with low coal consumption rate. This paper compares performances of a solar tower aided coal-fired power plant, a solar tower power plant and a coal-fired power plant under different operative conditions. The comparison includes various solar multiple and thermal energy storage size. According...
The merits of superstructure-free synthesis are demonstrated for bi-objective design of thermal power plants. The design of thermal power plants is complex and thus best solved by optimization. Common optimization methods require specification of a superstructure which becomes a tedious and error-prone task for complex systems. Superstructure specification is avoided by the presented superstructure-free...
The CO2 capture based on the MEA (monoethanolamine) absorption has been proved to be a practical and alternative method for the post-combustion CO2 capture. It is of benefit to the energy conservation of CO2 capture system to clarify the impacts of the absorbing column parameters on the system performance. Based on the representative elementary volume method and pseudo-single-liquid model, the computational...
Solar-aided coal-fired power generation system is the integration of solar energy and conventional coal-fired power system. The first stage extraction from turbines was replaced by solar energy to heat feedwater, so that the replaced high pressure steam can continue to work in Rankine cycle. Thermo-economic structural theory was applied to perform a comparative study between the fuel-saving mode and...
Based on the benchmark MCFC (molten carbonate fuel cell) hybrid system without CO2 capture, a novel ITM (oxygen ion transfer membrane)-integrated MCFC hybrid system with CO2 capture is proposed, which uses ITM to produce the needed oxygen for the oxy-fuel combustion in the afterburner. With the Aspen plus software, the system model is established and then the system performance is investigated. In...
The optimal synthesis and design of thermal power plants is best addressed using mathematical optimization techniques. However, conventional optimization methods require the user to manually define a priori the potential solution space through the modeling of a superstructure, which is a time-consuming, complex, and error-prone task. More importantly, the final superstructure model can not guarantee...
In this paper, a new Integrated Gasification Combined Cycle (IGCC) system with less CO2 emission by integrating a Molten Carbonate Fuel Cell (MCFC) to capture CO2 has been proposed. The performance of the new system is compared with other three systems: a conventional IGCC system without CO2 capture, an IGCC system with pre-combustion capture and an IGCC system with oxy-fuel combustion capture. In...
A two-stage ORC (organic Rankine cycle) is proposed, by which low-grade heat of exhaust flue gas of a 123.5 MW gas-steam combined cycle power generating unit, as well as the cryogenic energy of LNG (liquefied natural gas) can be effectively recovered and utilized. R227ea and R116 are selected as working fluids for the system. Based on the thermodynamic mathematical models, the effects of key design...
Double reheat steam systems have been receiving more attention because of the rapid development of ultra-supercritical power plants. In this study, the thermodynamic analysis and design optimization of a double reheat system in an ultra-supercritical power plant are comprehensively conducted. Besides, thermodynamics calculation, as well as exergy and techno-economic analyses are conducted to reveal...
This paper studies a gas-steam combined cycle system with CO2 capture by integrating the MCFC (molten carbonate fuel cell). With the Aspen plus software, this paper builds the model of the overall MCFC-GT hybrid system with CO2 capture and analyzes the effects of the key parameters on the performances of the overall system. The result shows that compared with the gas-steam combined cycle system without...
This study proposed a polygeneration system based on coal partial gasification, in which methanol and power were generated. This proposed system, comprising chemical and power islands, was designed and its characteristics are analyzed. The commercial software Aspen Plus was used to perform the system analysis. In the case study, the energy and exergy efficiency values of the proposed polygeneration...
Based on a traditional SOFC (solid oxide fuel cell) hybrid power system, three different SOFC hybrid power systems with zero-CO 2 emission are proposed in this paper and their performances are analyzed and compared. The anode outlet gas of SOFC burns with the pure oxygen and the concentration of CO 2 is greatly increased. In order to maintain the appropriate turbine inlet temperature,...
The direct air-cooled power generating units subjected to the environmental natural wind were influenced by the cluster effect of the axial flow fan cluster and the exhaust hot air recirculation simultaneously. The coupling effects would lead to complex variations of fan cooling capacity in different areas of the air-cooled condensers. The divisional regulation experiments were carried out on the...
Based on the Aspen Plus software, MEA-based CO2 capture system, steam cycle system, CO2 compression system, AHT (Absorption Heat Transformer) and AHP (Absorption Heat Pump) models are established. Effects of the key parameters on the MEA regeneration energy consumption are analyzed. Two different integration ways are proposed. The steam supplied for regeneration of the solvent will be extracted before...
In this paper, the phase transition characteristics of CO 2 and CO 2 /H 2 mixture are analyzed, and ideas for improving the cryogenic separation method are drawn. On this basis, a novel CO 2 cryogenic liquefaction and separation system is put forward. In the novel system, two-stage compression, two-stage refrigeration, two-stage separation, and sufficient recovery of...
The growth of power generation in China since the 1980s has been reviewed by analyzing the relationship between demand and supply of power, the increasing in installed capacity, and the variations in power-resource structure. Currently, the power generation from pulverized coal (PC) is dominant in the China's power industry, with relevant PC-power-generation technologies being introduced in the past...
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