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1

The influence of selected parameters on the efficiency and economic charactersistics of the oxy-type coal unit with a membrane-cryogenic oxygen separator

Kotowicz J., Berdowska S.

Archives of Thermodynamics

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2016

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Vol. 37, no. 1

73--85

EN

In this paper a 600 MW oxy-type coal unit with a pulverized bed boiler and a membrane-cryogenic oxygen separator and carbon capture installation was analyzed. A membrane-cryogenic oxygen separation installation consists of a membrane module and two cryogenic distillation columns. In this system oxygen is produced with the purity equal to 95%. Installation of carbon capture was based on the physical separation method and allows to reduce the CO2 emission by 90%. In this work the influence of the main parameter of the membrane process – the selectivity coefficient, on the efficiency of the coal unit was presented. The economic analysis with the use of the break-even point method was carried out. The economic calculations were realized in view of the break-even price of electricity depending on a coal unit availability.

2

The characteristics of the possibility of the use of polymer membranes in production of oxygen for energy processes

Kotowicz J., Berdowska S.

Archiwum Energetyki

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2012

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T. 42, nr 3/4

57--70

EN

In this paper, different methods of oxygen production are characterized. The main attention is focused on the use of polymer membranes. Hybrid method is proposed in the process of oxygen production. Membrane is used in the first stage of this method, while in the second one, the cryogenic process is chosen. The calculations of the membrane parameters have been made in Aspen software. The characteristic values for the membrane separation process such as oxygen recovery rate and permeate purity have been determined. Various systems have been analyzed. It has been calculated that energy consumption in the process of cryogenic oxygen production reaches 0.2 kWh/kgO2 or even 0.19 kWh/kgO2 in the membrane process using a vacuum pump, and in the near future, with the improvement of the membrane properties it will be limited to 0.15 kWh/kgO2.

PL

W artykule scharakteryzowano różne metody produkcji tlenu. Główną uwagę skupiono na wykorzystaniu membran polimerowych. W procesie produkcji tlenu zaproponowano metodę hybrydową, w której w pierwszym stopniu stosuje się membranę, zaś w drugim proces kriogeniczny. Obliczenia membran wykonano przy wykorzystaniu programu Aspen. Wyznaczono charakterystyczne wielkości dla procesu separacji membranowej takie jak stopień odzysku tlenu i czystość permeatu. Analizowano różne układy. Obliczono, że przy zastosowaniu pompy próżniowej w procesie membranowym energochłonność kriogenicznego procesu wytwarzania tlenu może wynieść 0,2 kWh/kgO2 lub nawet 0,19 kWh/kgO2, zaś w najbliższej przyszłości wraz z polepszeniem się właściwości membran może być ograniczona do 0,15 kWh/kgO2.

3

Technology of oxygen production in the membrane-cryogenic air separation system for a 600 MW oxy-type pulverized bed boiler

Berdowska S., Skorek-Osikowska A.

Archives of Thermodynamics

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2012

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Vol. 33, no. 3

65-76

EN

In this paper the results of the thermodynamic analysis of the oxy-combustion type pulverized bed boiler integrated with a hybrid, membrane-cryogenic oxygen separation installation are presented. For the calculations a 600 MW boiler with live steam parameters at 31.1 MPa /654.9[degrees]C and reheated steam at 6.15 MPa/672.4[degrees]C was chosen. In this paper the hybrid membrane-cryogenic technology as oxygen production unit for pulverized bed boiler was proposed. Such an installation consists of a membrane module and two cryogenic distillation columns. Models of these installations were built in the Aspen software. The energy intensity of the oxygen production process in the hybrid system was compared with the cryogenic technology. The analysis of the influence of membrane surface area on the energy intensity of the process of air separation as well as the influence of oxygen concentration at the inlet to the cryogenic installation on the energy intensity of a hybrid unit was performed.