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Thermodynamic analysis of cycle arrangements of the coal-fired thermal power plants with carbon capture

Kindra Vladimir Olegovich, Milukov Igor Alexandrovich, Shevchenko Igor Vladimirovich, Shabalova Sofia Igorevna, Kovalev Dmitriy Sergeevich

Archives of Thermodynamics

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2021

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Vol. 42, no. 4

103--121

EN

The electricity production by combustion of organic fuels, especially coal, increases the atmospheric CO2 content, which contributes to global warming. The greenhouse gas emissions by the power production industry may be reduced by the application of CO2 capture and storage systems, but it remarkably decreases the thermal power plant (TPP) efficiency because of the considerable increase of the auxiliary electricity requirements. This paper describes the thermodynamic analysis of a combined cycle TPP with coal gasification and preliminary carbon dioxide capture from the syngas. Utilization of the heat produced in the fuel preparation increases the TPP net efficiency from 42.3% to 47.2%. Moreover, the analysis included the combined cycle power plant with coal gasification and the CO2 capture from the heat recovery steam generator exhaust gas, and the oxy-fuel combustion power cycle with coal gasification. The coal-fired combined cycle power plant efficiency with the preliminary CO2 capture from syngas is 0.6% higher than that of the CO2 capture after combustion and 9.9% higher than that with the oxy-fuel combustion and further CO2 capture. The specific CO2 emissions are equal to 103 g/kWh for the case of CO2 capture from syngas, 90 g/kWh for the case of CO2 capture from the exhaust gas and 9 g/kWh for the case of oxy-fuel combustion.

2

Thermodynamic analysis of an innovative steam turbine power plant with oxy-methane combustors

Kindra Vladimir Olegovich, Osipov Sergey Konstantinovich, Zlyvko Olga Vladimirovna, Shcherbatov Igor Alexandrovich, Sokolov Vladimir Petrovich

Archives of Thermodynamics

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2021

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Vol. 42, no. 4

123--140

EN

The Rankine cycle steam turbine power plants make a base for world electricity production. The efficiency of modern steam turbine units is not higher than 43–45%, which is remarkably lower compared to the combined cycle power plants. However, an increase in steam turbine power plant efficiency could be achieved by the rise of initial cycle parameters up to ultra-supercritical values: 700–780˚C, 30–35 MPa. A prospective steam superheating technology is the oxy-fuel combustion heating in a sidemounted combustor located in the steam pipelines. This paper reviews thermal schemes of steam turbine power plants with one or two side-mounted steam superheaters. An influence of the initial steam parameters on the facility thermal efficiency was identified and primary and secondary superheater parameters were optimized. It was found that the working fluid superheating in the side-mounted oxy-methane combustors leads to an increase of thermal efficiency higher than that with the traditional boiler superheating in the initial temperature ranges of 700–780˚C and 660–780˚C by 0.6% and 1.4%, respectively.

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Thermodynamic analysis and profitability study of a power unit with an added CO2 capture plant

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

Journal of Power Technologies

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2016

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Vol. 96, nr 4

276--284

EN

Concerns over greenhouse gas emissions are driving a requirement for newly built coal power units to satisfy the so-called “capture ready” conditions. This paper presents the a thermo-economic analysis supplemented by a cost evaluation of a power unit for ultra-supercritical parameters expanded by an amine-based CO2 capture plant. The analysis was performed with the use of an integrated package containing the IPSEpro, MATLAB and Revenue Requirement Method implemented in MOExcel. The 0D model of a post combustion capture installation was developed based on complex CFD calculations of the absorber and stripper. A number of CFD simulations were conducted to create a large database, which was then utilized to develop suitable correlations describing the process Thermodynamic and economic calculations were performed in respect of a power plant coupled with a CO2 separation unit for a varying ratio of amine solvent to the exhaust gas stream (L/G). A local minimum for reboiler heat duty was found for L/G≈3.5 revealing the optimal post combustion capture configuration. It was observed that complementing the power unit with a post-combustion capture (PCC) installation causes a slight increase in the investment costs due to the drop in efficiency, but more important is the rise in total cost due to the investment associated with the CO2 capture plant. It was found that about 14 years is required to compensate the investment cost of the PCC installation.

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Absorpcja CO₂ w roztworach amin szansą obniżenia emisji krajowych elektrowni węglowych

Krótki A., Tatarczuk A., Więcław-Solny L., Stec M., Sobolewski A., Tokarski S.

Przemysł Chemiczny

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2014

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T. 93, nr 12

2241-2245

PL

Przedstawiono najbardziej zaawansowaną pod względem technologicznym metodę absorpcji chemicznej CO2 w procesach PCC (post combustion capture). Program badawczy w obszarze technologii CCS obejmujący kompleksowe badanie sorbentów aminowych oraz procesów absorpcji i desorpcji został zrealizowany w skali laboratoryjnej, półtechnicznej i pilotowej przez Instytut Chemicznej Przeróbki Węgla we współpracy z Tauron Polska Energia SA i Tauron Wytwarzanie SA. Przedstawiono niektóre zagadnienia projektowe pierwszej w Polsce przewoźnej instalacji pilotowej aminowego usuwania CO2 ze spalin. Zaprezentowano wybrane wyniki badań sprawności procesu i zapotrzebowania cieplnego procesu desorpcji.

EN

A process for absorption of CO2 in aq. solns. of NH2 C2 H4 OH (20 or 30% by mass) was developed and checked under lab. and semi-tech. scale conditions. The knowledge and experience about the process allowed to design and build the CO2 capture mobile pilot plant. Some operational problems (corrosion, sepn. of residues) were also dissolved.

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Numerical analysis of CO2 capture efficiency in post combustion CCS technology in terms of varying flow conditions

Niegodajew P., Asendrych D., Drobniak S.

Archives of Thermodynamics

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2013

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Vol. 34, no. 4

123--136

EN

The paper deals with the computational fluid dynamics modelling of carbon dioxide capture from flue gases in the post combustion-capture method, one of the available carbon capture and storage technologies. 30% aqueous monoethanolamine solution was used as a solvent in absorption process. The complex flow system including multiphase countercurrent streams with chemical reaction and heat transfer was considered to resolve the CO2 absorption. The simulation results have shown the realistic behaviour and good consistency with experimental data. The model was employed to analyse the influence of liquid to gas ratio on CO2 capture efficiency.