Wyniki wyszukiwania - BazTech

1

Selecting the configuration of inter-stage coolers for a CO2 compressor

Rulik S., Witkowski A.

Journal of Power Technologies

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2015

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Vol. 95, nr 3

228--237

EN

The compression process is one of the most energy-consuming stages of the entire cycle of the carbon dioxide capture and storage. a reduction in the energy consumption of this process may have a significant impact on the overall net efficiency of electricity generation. One method to improve the efficiency of the compression process is to introduce inter-stage cooling, which makes it possible to cause compression to resemble an isothermal process. This paper presents an analysis of the operation of a cooling system of an eight-stage integrally geared compressor working for a 900 MW coal-fired power plant equipped with a CCS system. The research conducted enables rational values of the heat transfer coefficient to be determined for individual inter-stage coolers. a series of calculations is performed in this analysis for different assumptions and for an assumed geometry of the inter-stage coolers. The results obtained allow one to determine both the heat exchange surface area and the pressure drops on the “hot” and “cold” agent sides for individual coolers. Moreover, the presented analysis identifies a number of problems that arise when selecting the configuration and the appropriate parameters of the cooling system.

2

Analysis of the use of cooling heat of compressed gas to supply the Rankine Cycle with a low-boiling medium

Bartela Ł., Brzęczek M.

Rynek Energii

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2014

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Nr 4

130--135

EN

In this paper results of thermodynamic analysis for variants of CO2 compression installation integrated with an Organic Rankine Cycle (ORC) are shown. In the analyzed cases it was assumed that installation is equipped with a compressors with variable number of sections. Gas coolers are used between respective sections, which allows to reduce the work of compression. Conducted analyzes allowed to determine the extent to which the cooling heat can be efficiently transformed into electricity. Analyzes of the respective variants were carried out for three different working media, i.e., two low-boiling media – ethanol, R245ca and water. For the respective media the net efficiencies of electricity production of the ORC module, which can be obtained depending on the applied pressure of steam generated in the heat recovery steam generator were calculated. Also, for all cases, the distribution of power rate of a module were obtained as a function of pressure.

PL

W artykule przedstawiono wyniki analiz termodynamicznych dla wariantów instalacji sprężania dwutlenku węgla separowanego w bloku energetycznym zintegrowanej z organicznym obiegiem Rankine’a (ORC). Założono, że w analizowanych wariantach wykorzystuje się sprężarki o zróżnicowanej liczbie sekcji. Pomiędzy poszczególnymi sekcjami zabudowane są chłodnice mające pozwolić na wychłodzenie gazu, dzięki czemu ogranicza się pracę potrzebną do jego sprężania. Przeprowadzone analizy pozwoliły określić w jakim stopniu ciepło chłodzenia może zostać efektywnie przetransformowane w energię elektryczną. Analizy poszczególnych wariantów przeprowadzono dla trzech różnych czynników obiegowych, tj. dwóch niskowrzących – etanolu i R245ca oraz wody. Dla poszczególnych czynników określono, sprawności wytwarzania energii elektrycznej modułu ORC, jakie są możliwe do uzyskania w zależności od stosowanego ciśnienia pary generowanej w kotle odzyskowym. Również w funkcji ciśnienia dla wszystkich analizowanych przypadków uzyskano rozkłady mocy elektrycznej siłowni ORC.

3

The influence of CO2 capture and compression on the economic characteristics of a combined cycle power plant

Kotowicz J., Brzęczek M.

Journal of Power Technologies

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2013

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Vol. 93, nr 5

314--322

EN

This paper presents the results of an economic analysis of a triple-pressure combined cycle power plant with the steam reheater (3PR). The economic analysis was performed for two variants of the block - with and without the integration of the system with the installation of CO2 capture and compression. The structures of the triple-pressure combined cycle power plant with the steam reheater and CO2 capture and compression installation (CCS) was presented. The characteristic values of systems and the economic assumptions were summarized. An analysis of a break-even point (BEP), which was the minimum selling price for electricity, was performed. A sensitivity analysis of individual components to a break-even price of electricity and the impact of degradation of the efficiency and the power characteristics of the combined cycle power plant was conducted.

4

Optimizing management of the condensing heat and cooling of gases compression in oxy block using of a genetic algorithm

Brzęczek M., Bartela Ł.

Archives of Thermodynamics

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2013

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Vol. 34, no. 4

199--214

EN

This paper presents the parameters of the reference oxy combustion block operating with supercritical steam parameters, equipped with an air separation unit and a carbon dioxide capture and compression installation. The possibility to recover the heat in the analyzed power plant is discussed. The decision variables and the thermodynamic functions for the optimization algorithm were identified. The principles of operation of genetic algorithm and methodology of conducted calculations are presented. The sensitivity analysis was performed for the best solutions to determine the effects of the selected variables on the power and efficiency of the unit. Optimization of the heat recovery from the air separation unit, flue gas condition and CO2 capture and compression installation using genetic algorithm was designed to replace the low-pressure section of the regenerative water heaters of steam cycle in analyzed unit. The result was to increase the power and efficiency of the entire power plant.

5

Procesowe i systemowe wskaźniki energetyczno-ekologiczne zintegrowanego bloku energetycznego - metodyka obliczeń

Ziębik A.

Energetyka

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2010

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nr 1

23-31

PL

Przedstawiono zasady wyznaczania wskaźników procesowych bezpośredniego oraz systemowych skumulowanego zużycia energii dla bloku energetycznego zintegrowanego z instalacją usuwania i sprężania CO2 oraz tlenownią. Zaproponowane podejście obliczania wskaźników skumulowanego zużycia energii bazuje na założeniu, że powiązania między analizowanym blokiem a krajowym systemem energetycznym mają charakter powiązań słabych. To oznacza, że w bilansie skumulowanego zużycia energii można się posłużyć średnimi krajowymi wartościami wskaźników skumulowanego zużycia dla paliw i materiałów dostarczanych do zintegrowanego bloku z zewnątrz. Analogiczne podejście proponuje się w przypadku analizy systemowej skumulowanych emisji i wskaźników kosztu termoekologicznego.

EN

Presented is a methodology of calculation of process and system energy indices, concerning direct and cumulative energy consumption in a pulverised coal power unit integrated with a CO2 capture and compression installation and an oxygen plant. The proposed approach to calculation of cumulative energy consumption indices is based on an assumption that the connections between considered power unit and national energy system are weak. It means that in the balance of a cumulative energy consumption, average national indices of cumulative energy consumption concerning fuels and materials delivered to the power unit from outside can be used. Analogical approach is proposed in the case of cumulative emissions and indices of thermoecological costs system analysis.