Increase of power and efficiency of the 900 MW supercritical power plant through incorporation of the ORC (original) (raw)
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2012
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A conventional exergy analysis can highlight the main components having high thermodynamic inefficiencies, but cannot consider the interactions among components or the true potential for the improvement of each component. By splitting the exergy destruction into endogenous/exogenous and avoidable/unavoidable parts, the advanced exergy analysis is capable of providing additional information to conventional exergy analysis for improving the design and operation of energy conversion systems. This paper presents the application of both a conventional and an advanced exergy analysis to a supercritical coal-fired power plant. The results show that the ratio of exogenous exergy destruction differs quite a lot from component to component. In general, almost 90% of the total exergy destruction within turbines comes from their endogenous parts, while that of feedwater preheaters contributes more or less 70% to their total exergy destruction. Moreover, the boiler subsystem is proven to have a large amount of exergy destruction caused by the irreversibilities within the remaining components of the overall system. It is also found that the boiler subsystem still has the largest avoidable exergy destruction; however, the enhancement efforts should focus not only on its inherent irreversibilities but also on the inefficiencies within the remaining components. A large part of the avoidable exergy destruction within feedwater preheaters is exogenous; while that of the remaining components is mostly endogenous indicating that the improvements mainly depend on advances in design and operation of the component itself.
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Energy and exergy efficiencies of a supercritical power plant have been studied in this paper. The effect of ambient weather condition was considered on the condenser pressure. It was shown that high ambient temperature has more adverse effect on the exergy efficiency than the energy efficiency. As ambient temperature increases, the exergy efficiency of the boiler, condenser, heaters and feed water pump decrease, while the exergy efficiency of the turbine improves slightly. The analysis showed that exergy efficiency of the supercritical boiler is considerably higher than the conventional boiler but it is still the main source of total irreversibility.
System Design and Analysis of a "Supercritical Thermal Power Plant" with a capacity of 800 MW.
Supercritical steam power plants meet notably the requirements for high efficiencies to reduce both fuel costs and emissions as well as for a reliable supply of electric energy at low cost. Recent developments in steam turbine technology and high-temperature materials allowed for significant efficiency gains. Introduction of the advanced technology has led to the current expansion of supercritical power plants worldwide. Therefore, In order to cope with the growing demand of power within India, a fundamental understanding of these power plants and implications are necessary. The aim of this report is to provide an analysis of plant and operational features of a Super Critical Power Plant along with impact of coal quality on operational issues.
International Journal of Design & Nature and Ecodynamics, 2022
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Performance analysis of supercritical ORC utilizing marine diesel engine waste heat recovery
Alexandria Engineering Journal, 2020
Marine diesel engine is widely used in merchant ships as a propulsion system. The wasted heat of the diesel engines is one of the main drawbacks in this system. The aim of this paper is to recover this wasted heat to be used in designing combined heat and power plant. A bulk carrier WADI SAFAGA has been investigated as a case study. Power and electricity from Supercritical Organic Rankine Cycle will be produced as wasted heat recovery of the main engine. Maximum power, thermal efficiency and specific fuel consumption have been investigated according to the change of the evaporating pressure of organic fluid from 50 bar to 75 bar with increment of 5 bar. Heat exchangers must be redesigned due to the replacement of cooling water by refrigerant (R34a and R245fa). Also, parametric and economic studies will be taken into account. A comparison between diesel generator and SORC generator will be studied from economic and weight dimensions together with the specific power of generator point of view. The results showed that using SORC with R134a at working pressure of 50 bar have a satisfied performance with respect to the saving in specific fuel consumption, lubrication oil and cooling water. In addition, replacing three diesel generators by one SORC generator would decrease the weight by 12 tons, and would also decrease fuel consumption by 2.1 ton/day, shrinking the heat exchangers size, specific fuel consumption was decreased by 61 g/kW-h. Finally, the wasted heat of the main engine will decrease by 18%.
Energy, 2014
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 the energy-saving effects of various systems. Through comprehensive system optimization, an optimized double reheat system adopting 10-stage extractions and two outer steam coolers is proposed, whose heat rate can be further reduced by 80.7 kJ/kWh (1.04%) based on conventional double reheat system. Considering that the additional investment of the optimized double reheat system is only increased by 0.76%, the cost of electricity of the optimized system is only 55.89 USD/MWh. This cost is not only less than the conventional double reheat system, but also even less than the single reheat system. This result indicates that system optimization can improve both thermal and economic performance. The research of this paper may provide an effective method for the optimization of a double reheat system in ultra supercritical power plants.
Thermodynamic and economic analysis of a 900 MW ultra-supercritical power unit
Archives of Thermodynamics, 2000
The paper presents a thermal-economic analysis of different variants of a hard coal-fired 900 MW ultra-supercritical power unit. The aim of the study was to determine the effect of the parameters of live and reheated steam on the basic thermodynamic and economic indices of the thermal cycle. The subject of the study was the cycle configuration proposed as the "initial thermal cycle structure" during the completion of the project "Advanced Technologies for Energy Generation" with the live and reheated steam parameters of 650/670 o C. At the same time, a new concept of a thermal cycle for ultra-supercritical parameters with live and reheated steam temperature of 700/720 o C was suggested. The analysis of the ultra-supercritical unit concerned a variant with a single and double steam reheat. All solutions presented in the paper were subject to a detailed thermodynamic analysis, as well as an economic one which also included CO2emissions charges. The conducted economic analysis made it possible to determine the maximum value of investment expenditures at which given solutions are profitable.