Wyniki wyszukiwania - BazTech

1

Evaluation of IPSEpro extended by MATLAB applied to steam turbine cycle analysis

Elsner W., Kowalczyk Ł., Marek M.

Journal of Power Technologies

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2015

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Vol. 95, nr 3

192--200

EN

This paper investigates thermodynamic optimization of a supercritical coal fired power plant. The main goal of the study was to assess IPSEpro software combined with MATLAB environment, aimed at multiobjective optimization of the thermal cycle in a relatively short timeframe. To verify the methodology, calculations were carried out using the IPSEpro (standalone) approach and IPSEpro-MATLAB with fmincon function. The decision functions were: thermal efficiency, gross power efficiency and total power load. It was shown that the results obtained with the IPSEpro standalone approach are similar to those obtained with the IPSEpro- MATLAB package. This means that the IPSEpro-MATLAB approach can be successfully used in future calculations. The evident benefit of the newly developed methodology is a significant reduction in computational time compared to the referenced method. It was shown that the computational time depends on both the methodology and the chosen objective function. The results show that the detected optimal point also depends on the shape of the objective function distribution. Optimization of the thermodynamic parameters of the sample ultra-supercritical power plant enables an increase in output power from 900 MW to 909.44 MW.

2

Comparative analysis of optimisation methods applied to thermal cycle of a coal fired power plant

Kowalczyk Ł., Elsner W.

Archives of Thermodynamics

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2013

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Vol. 34, no. 4

175--186

EN

The paper presents a thermodynamic optimization of 900 MW power unit for ultra-supercritical parameters, modified according to AD700 concept. The aim of the study was to verify two optimisation methods, i.e., the finding the minimum of a constrained nonlinear multivariable function (fmincon) and the Nelder-Mead method with their own constrain functions. The analysis was carried out using IPSEpro software combined with MAT-LAB, where gross power generation efficiency was chosen as the objective function. In comparison with the Nelder-Mead method it was shown that using fmincon function gives reasonable results and a significant reduction of computational time. Unfortunately, with the increased number of decision parameters, the benefit measured by the increase in efficiency is becoming smaller. An important drawback of fmincon method is also a lack of repeatability by using different starting points. The obtained results led to the conclusion, that the Nelder-Mead method is a better tool for optimisation of thermal cycles with a high degree of complexity like the coal-fired power unit.

3

Thermodynamic analysis of a thermal cycle of supercritical power plant

Elsner W., Kowalczyk Ł., Niegodajew P., Drobniak S.

Mechanics and Mechanical Engineering

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2011

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Vol. 15, nr 3

217-225

EN

The study presented in this paper deals with the analysis of operating conditions of a modern supercritical power plant. The 460 MW reference thermal cycle, which is based on the Łagisza supercritical, coal fired power plant was selected for this study. The thermodynamic analysis was performed with the use of the industrial software package IPSEpro, designed for power plant engineering. The main objective was to demonstrate the role of supercritical parameters in enhancing the efficiency of the thermodynamic process. It was done among the others by the comparative analysis of two thermal cycles, one working with standard and the other with supercritical parameters. Apart from nominal operating conditions part load operation was analyzed.

4

Thermo-economic study of a free gas turbine-absorption cogeneration cycle

Betelmal E., Agnew B.

Archives of Thermodynamics

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2005

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Vol. 26, no. 2

73-85

EN

This paper discusses the benefits of using the cogeneration system for power and cooling in the form of the combined free turbine gas turbine-absorption cycle generation and finds the variations of performance of the gas turbine with different ambient conditions ranging from 2°C to 40°C (off-design). An energy analysis of a gas turbine cycle combined with an absorption refrigeration unit has been presented. The commercial package IPSEpro was used to model this cycle. It is a highly flexible computer method for thermodynamic power cycle calculations. A thermo-economic analysis and pay back period of a combined cycle have been examined and has shown that cogeneration can be considered to be an effective way to save electric energy cost, since the primary source of energy for an absorption chillier is natural gas or waste heat, these chillers require very little electric energy.

5

Analiza pracy bloku 120 MW przy wykorzystaniu programu IPSEpro

Moryń-Kucharczyk E., Tarnowski T.

Energetyka

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2003

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nr 3

165-168

PL

Wyniki zastosowania programu IPSEpro do analizy wpływu wybranych parametrów obiegu na jego ogólną sprawność cieplną potwierdziły przydatność pakietu do tego celu. Wprawdzie program IPSEpro nie uwzględnia szeregu zmian zachodzących w rzeczywistym obiegu, ale mimo to w wyniku symulacji pracy bloku przy jego wykorzystaniu uzyskuje się wyniki zbliżone do rzeczywistych. Można podkreślić,że komputerowa symulacja pracy obiegów cieplnych jest o wiele bardziej ekonomiczna i mniej czasochłonna niż badania na obiektach rzeczywistych,dlatego też warto polecać programy narzędziowe typu IPSEpro, zarówno do projektowania jak i analizy pracy obiegów cieplnych siłowni.

EN

Results of use of the IPSEpro programme for analysis of chosen parameters of the thermal cycle efficiency. Results of the programme application has proved it usefulness for this purpose. Although the IPSEpro programme does not take into consideration many changes in the thermal cycle, nevertheless as simulation result of the power unit operation with it use achieved results are near real ones. Therefore,one can underline that computer simulation of the thermal cycles is more economic and less time-consuming than investigations at real objects,so it is worth to recommend such programmes as IPSEpro,as for designing,as for analysis of the thermal cycles of the power plant as well.