Efficiency improvements for the coal-fired power plant retrofit with CO 2 capture plant using chilled ammonia process

Hanak, Dawid P.; Biliyok, Chechet; Manović, Vasilije

doi:10.1016/j.apenergy.2015.04.059

Cited by 76 publications

(26 citation statements)

References 46 publications

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“…A process model of a 580 MWel supercritical coal-fired power plant, which is considered as a benchmark in this study, was developed in Aspen Plus and described in detail by Hanak et al [25,54]. The prediction of this model was found to be in close agreement with data provided in the revised NETL report [55], confirming the efficacy of the modelling approach and high fidelity of the model.…”

Section: Supercritical Coal-fired Power Plantsupporting

confidence: 70%

Calcium looping with supercritical CO2 cycle for decarbonisation of coal-fired power plant

Hanak

2016

Energy

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State-of-the-art integration scenarios of calcium looping (CaL), which is an emerging CO2 capture technology, assume that excess heat is used to raise steam for the steam cycle and result in a net efficiency penalty of 6.0-8.0% points. In this study, a concept using the supercritical CO2 cycle (s-CO2) instead of the conventional steam cycle is proposed. Retrofit of CaL with recompression s-CO2 cycle to the 580 MWel coal-fired power plant was found to result in a net efficiency penalty of 6.9%HHV points. This is 1%HHV point lower than that for the same system linked with the steam cycle having the same turbine inlet conditions (593.3°C/242.3 bar). A further reduction of the net efficiency penalty to 5.8%HHV points was achieved through considering a pump instead of a first CO2 compression stage and increasing the turbine inlet temperature to 620°C and pressure to 300 bar. As the s-CO2 cycle's specific capital cost is up to 27% lower than that of the equivalent steam cycle, CaL with s-CO2 cycle is a viable option for the coal-fired power plant decarbonisation. Moreover, it can be expected that this cycle can be successfully implemented in other high-temperature looping cycles, such as chemical looping combustion.

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Section: Supercritical Coal-fired Power Plantsupporting

confidence: 70%

Calcium looping with supercritical CO2 cycle for decarbonisation of coal-fired power plant

Hanak

2016

Energy

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“…Solvent performance comparison for a large scale pulverized coal power plant was reported by Sharifzadeh et al [14]. Hanak et al [15] reported efficiency improvements for the coal-fired power plant retrofit with CO2 capture plant using chilled ammonia process showing efficiency penalty reduced to 8.7% Also Zhao et al [16] using mixed solvent for 650 MW power plant reported that the net power efficiency penalty was reduced from 9.13% to 7.66%. Approaches such as heat integration, inter-cooling among others could reduce the operating cost slightly.…”

Section: Introductionmentioning

confidence: 91%

Modelling, simulation and analysis of intensified regenerator for solvent based carbon capture using rotating packed bed technology

et al. 2017

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Intensified regenerator/stripper using rotating packed bed (RPB) for regeneration of rich-MEA solvent in post-combustion CO2 capture with chemical absorption process was studied through modelling and simulation in this paper. This is the first systematic study of RPB regenerator through modelling as there is no such publication in the open literature. Correlations for liquid and gas mass transfer coefficients, heat transfer coefficient, liquid holdup , interfacial area and pressure drop which are suitable for RPB regenerator were written in visual FORTRAN as subroutines and then dynamically linked with Aspen Plus ® rate-based model to replace the default mass and heat transfer correlations in the Aspen Plus ®. The model now represents intensified regenerator/stripper. Model validation shows good agreement between model predictions and experimental data from literature. Process analyses were performed to investigate the effect of rotor speed on the regeneration efficiency and regeneration energy (including motor power). The rotor speed was varied from 200 to 1200 rpm, which was selected to cover the validation range of rotor speed. Impact of reboiler temperature on the rate of CO2 stripping was also investigated. Effect of rich-MEA flow rate on regeneration energy and regeneration efficiency was studied. All the process analyses were done for wide range of MEA concentration (32.6 wt%, 50 wt% and 60 wt%). Comparative study between regenerator using packed column and intensified regenerator using RPB was performed and the study shows a size reduction of 9.691 times. This study indicates that RPB process has great potential in thermal regeneration application.

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“…The 580 MWel supercritical coal-fired power plant, which has a net thermal efficiency of 38.0%HHV, is used as a reference in this study. A process model of this unit has been previously developed in Aspen Plus ® [39,40] based on, and validated with data presented in, the revised NETL report [41]. The considered coal-fired power plant train.…”

Section: Supercritical Coal-fired Power Plantmentioning

confidence: 99%

Economic feasibility of calcium looping under uncertainty

Hanak

2017

Applied Energy

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An emerging calcium looping process has been shown to be a promising alternative to solvent scrubbing, which is regarded as the most mature CO2 capture technology. Its retrofits to coal-fired power plants have the potential to reduce both energy and economic penalties associated with the mature CO2 capture technologies. However, these conclusions have been made based on the deterministic outputs of the economic models that have not considered uncertainties in the model inputs. Therefore, this study incorporates a stochastic approach into the economic analysis of the retrofit of such emerging CO2 capture technology to the coal-fired power plant. The stochastic analysis revealed that levelised cost of electricity (LCOE) and specific total capital requirement were highly affected by the uncertainty in the input variables to the process and economic models. The most probable values for these key economic performance indicators were shown to fall between 75 and 115 €/MWelh, and 2100 and 2300 €/kWel,gross, respectively. Interestingly, the most probable LCOE values for the coal-fired power plant will fall between 50 and 150 €/MWelh. This indicated that the calcium looping retrofit scenario can become economically favoured, mainly due to the high economic penalties incurred by unabated coal-fired power plant associated with carbon tax. Importantly, the outputs of the stochastic economic assessment aligned well with the deterministic results reported in the literature. As the latter were generated using different sets of assumptions regarding the process and economic models, the stochastic approach to the economic assessment can minimise the impact of the model assumptions on estimates of the key economic parameters. Moreover, by indicating the probability of particular outputs, as well as ranking the model input variables according to their influence on the key economic performance, such analysis would allow making more insightful decisions regarding further funding 2 and development of the calcium looping process. Finally, use of the stochastic approach in the economic feasibility assessment enables a more profound and reliable comparison of the different calcium looping retrofit configurations, as well as benchmarking different CO2 capture technologies.

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Efficiency improvements for the coal-fired power plant retrofit with CO 2 capture plant using chilled ammonia process

Cited by 76 publications

References 46 publications

Calcium looping with supercritical CO2 cycle for decarbonisation of coal-fired power plant

Calcium looping with supercritical CO2 cycle for decarbonisation of coal-fired power plant

Modelling, simulation and analysis of intensified regenerator for solvent based carbon capture using rotating packed bed technology

Economic feasibility of calcium looping under uncertainty

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