Exergy analysis and thermodynamic optimization of a bioenergy with carbon capture and storage gas power plant using Monte Carlo simulation of sewage sludge composition

Kamil Stasiak; Ivar Ståle Ertesvåg; Paweł Ziółkowski; Dariusz Mikielewicz

doi:10.1016/j.applthermaleng.2024.125312

Exergy analysis and thermodynamic optimization of a bioenergy with carbon capture and storage gas power plant using Monte Carlo simulation of sewage sludge composition

Abstract

An exergy analysis is performed on the negative CO2 emission gas power plant (nCO2PP), which integrates the fuel preparation, power generation and carbon capture process sections. The cycle is modeled in Aspen Plus coupled with REFPROP, combining deterministic and Monte Carlo stochastic approaches, the latter being a novelty in this work. In all cases studied, the simulations maintain the complex thermodynamic relationships. Exergy losses with areas of potential improvement are identified, while Monte Carlo simulation in Python generates sewage sludge composition, improving cycle realism. In the deterministic approach, the exergies are calculated for a single sewage sludge composition under ambient air conditions with relative humidity of 40 %, 50 % (base case) and 60 % and CO2 air concentration of 375 ppm, 417 ppm (base case) and 1000 ppm, representing a worst case scenario of CO2 increase until the year 2100. For the deterministic base case nCO2PP, the largest exergy losses are observed in the wet combustion chamber (127 kW, 62 % efficiency), gasification process (43 kW, 89 % efficiency), and water condensation in the gas scrubber (43 kW, 87 % efficiency), while the nCO2PP exergy efficiency, related to the chemical exergy of the sewage sludge, is 33.3 %. Sensitivity analysis on turbine vacuum and spray-ejector condenser suction pressure results in an increase of the nCO2PP efficiency by 0.3 % to 33.6 %. Monte Carlo results are incorporated into the Aspen Plus model after the base case optimization. These yield in a range of nCO2PP exergy efficiencies from 33.6 % to 39.7 % with a mean of 37.5 %.

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Authors (4)

Kamil Stasiak mgr inż.
Ivar Ståle Ertesvåg
- NTNU Norwegian University of Science and Technology
Paweł Ziółkowski dr inż.
Dariusz Mikielewicz prof. dr hab. inż.

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Articles

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artykuły w czasopismach

Published in:

APPLIED THERMAL ENGINEERING no. 264,
ISSN: 1359-4311

Language:

English

Publication year:

2025

Bibliographic description:

Stasiak K., Ertesvåg I. S., Ziółkowski P., Mikielewicz D.: Exergy analysis and thermodynamic optimization of a bioenergy with carbon capture and storage gas power plant using Monte Carlo simulation of sewage sludge composition// APPLIED THERMAL ENGINEERING -Vol. 264, (2025), s.125312-

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