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Performance of cryogenic oxygen production unit with exhaust gas bleed for sewage sludge gasification and different oxygen purities

Kaszuba Maja, Ziółkowski Paweł, Mikielewicz Dariusz

Archives of Thermodynamics

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2023

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Vol. 44, no 3

63--81

EN

The paper presents a thermodynamic analysis of the integration of a cryogenic air separation unit into a negative CO2 emission gas power plant. The power cycle utilizes sewage sludge as fuel so this system fits into the innovative idea of bioenergy with carbon capture and storage. A cryogenic air separation unit integrated with the power plant was simulated in professional plant engineering and thermodynamic process analysis software. Two cases of the thermodynamic cycle have been studied, namely with the exhaust bleed for fuel treatment and without it. The results of calculations indicate that the net efficiencies of the negative CO2 emission gas power plant reach 27.05% (combustion in 95.0% pure oxygen) and 24.57% (combustion in 99.5% pure oxygen) with the bleed. The efficiencies of the cycle without the bleed are 29.26% and 27.0% for combustion in 95.0% pure oxygen and 99.5% pure oxygen, respectively. For the mentioned cycle, the calculated energy penalty of oxygen production was 0.235 MWh/kgO2 for the lower purity value. However, for higher purity namely 99.5%, the energy penalty of oxygen production for the thermodynamic cycle including the bleed and excluding the bleed was indicated 0.346 and 0.347 MWh/kgO2, respectively. Additionally, the analysis of the oxygen purity impact on the carbon dioxide purity at the end of the carbon capture and storage installation shows that for the case with the bleed, CO2 purities are 93.8% and 97.6%, and excluding the bleed they are 93.8% and 97.8%, for the mentioned oxygen purities respectively. Insertion of the cryogenic oxygen production installation is required as the considered gas power plant uses oxy-combustion to facilitate carbon capture and storage method.

2

Analiza sprawności elektrowni na parametry nadkrytyczne z cyrkulacyjnym kotłem fluidalnym typu oxy

Dryjańska A.

Rynek Energii

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2013

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Nr 1

11--15

PL

W artykule zaprezentowano układ bloku energetycznego na parametry nadkrytyczne o mocy elektrycznej brutto: 600 MW. Jest to blok pracujący w technologii spalania tlenowego, z instalacją separacji kriogenicznej tlenu z powietrza oraz z instalacją wychwytu dwutlenku węgla. W kotle fluidalnym na parametry nadkrytyczne pary 29MPa/600˚C, zastosowano recyrkulację spalin wilgotnych. Omówiono poszczególne moduły znajdujące się w strukturze układu oxy, tj. opisano założenia przyjęte do obliczeń układu, a także przedstawiono metodologię wyznaczania sprawności wytwarzania energii elektrycznej bloku. Podczas obliczeń określono sprawność termiczną kotła, wskaźniki potrzeb własnych oraz sprawność wytwarzania energii elektrycznej netto. Wyniki porównano z elektrownią odniesienia o mocy 600 MW, pracującą w technologii spalania powietrznego.

EN

This paper presents the supercritical power unit of gross electrical equal to: 600 MW. This is a power plant working in the oxy-combustion technology, with a cryogenic air separation unit and a carbon capture and storage installation. In the fluidized bed boiler on the supercritical steam parameters 29 MPa/600 °C, a wet flue gas recirculation was applied. Each module, located in the structure of oxy plant was discussed. The assumptions used for the calculations and a methodology quantifying of the efficiency of electricity generation block was described. Values of energetic indices such as the boiler thermal efficiency, auxiliary power rates, and net efficiency of electricity generation, were specified. The results were compared with a reference power plant with a gross capacity of 600 MW, operating in the air-fired combustion.

3

Supercritical power plant 600 MW with cryogenic oxygen plant and CCS installation

Kotowicz J., Dryjańska A.

Archives of Thermodynamics

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2013

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Vol. 34, no. 3

123--137

EN

This article describes a thermodynamic analysis of an oxy type power plant. The analyzed power plant consists of: 1) steam turbine for supercritical steam parameters of 600°C/29 MPa with a capacity of 600 MW; 2) circulating fluidized bed boiler, in which brown coal with high moisture content (42.5%) is burned in the atmosphere enriched in oxygen; 3) air separation unit (ASU); 4) CO2 capture installation, where flue gases obtained in the combustion process are compressed to the pressure of 150 MPa. The circulated fluidized bed (CFB) boiler is integrated with a fuel dryer and a cryogenic air separation unit. Waste nitrogen from ASU is heated in the boiler, and then is used as a coal drying medium. In this study, the thermal efficiency of the boiler, steam cycle thermal efficiency and power demand were determined. These quantities made possible to determine the net efficiency of the test power plant.

4

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.