Analysis of supercritical coal fired oxy combustion power plant with cryogenic oxygen unit and turbo-compressor

Hnydiuk-Stefan, Anna; Składzień, J.

doi:10.1016/j.energy.2017.04.021

Cited by 17 publications

(7 citation statements)

References 24 publications

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“…These regenerable sorbents could be located in a power plant at the end of the cycle and would avoid the generation of waste contaminated with mercury. Therefore, they could be used in conventional coal combustion plants and also in other processes such as oxy-coal combustion, CO 2 purification or natural gas production [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Carbon-based sorbents impregnated with iron oxides for removing mercury in energy generation processes

Trobajo

Antuña-Nieto

Rodríguez

et al. 2018

Energy

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Gaseous phase mercury emissions into the atmosphere from fossil fuel combustion processes for energy production are a matter of serious environmental concern. Several technologies have been studied and proposed to address this problem, but none of them is mature enough from a commercial point of view. This study aims to provide new insights into the interaction between mercury and iron oxides in order to enable the design of cost-effective mercury capture technology based on regenerable sorbents. Different iron oxides supported on an activated carbon were prepared and tested for the removal of elemental mercury (Hg 0 ) under different experimental conditions. It was found that 1) maghemite promoted the removal of mercury to a greater extent than goetite/hematite achieving 100% efficiencies and 2) the mercurysorbent interaction is determined by the oxygen vacancies present in the iron oxide. The mercury retention efficiency is maintained after the sorbent is regenerated and it is not deactivated by the presence of acid gases. The results obtained with the sorbent loaded with maghemite open new perspectives for the retention of gaseous Hg 0 , combining high efficiency, good regenerability and lower price in comparison with sorbents developed to date. Once the regeneration capacity is assessed, the adsorption process will be scaled.

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Section: Introductionmentioning

confidence: 99%

Carbon-based sorbents impregnated with iron oxides for removing mercury in energy generation processes

Trobajo

Antuña-Nieto

Rodríguez

et al. 2018

Energy

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“…Each of those variants results in layout reorganization of the remaining plant parts, usually including changes in boiler feedwater train [55,56], boiler air and flue gas fans, and in flue gas and ash handling equipment [57] to boost the energy efficiency even further and to meet the tightening limits of pollutant emissions set by legislation [58]. Steam boiler retrofitting for alternative fuel as well as refitting to oxycombustion are relevant in large units, especially in thermal power plants where the effect of scale plays an important role [59,60]. Cheap fuels of reasonable quality (such as dry biomass or waste fraction) can, however, be used in smaller boilers after a cheap retrofit or boiler replacement [61][62][63].…”

Section: Repowering Of Thermal Power Plants and Industrialmentioning

confidence: 99%

Repowering Industrial Combined Heat and Power Units: a Contribution to Cleaner Energy Production

Variny¹,

Kšiňanová²

2022

Pol. J. Environ. Stud.

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Repowering of industrial combined heat and power units allows reducing industrial greenhouse gases emissions. An existing industrial unit served as model in the gas turbines-based repowering study, aiming at fuel consumption and carbon dioxide emissions reduction. Following unit's model setup and verification, two conservative repowering options (hot windbox and separate gas turbine + heat recovery steam generator) were assessed from economic, energetic, and environmental point of view, including seasonal impact. Hot windbox option leads to annual power production increase by 14.3% (72.8 GWh/year), accompanied by carbon dioxide emissions reduction by 3.9 % (29.5 ktons/year) compared to the base case. The second option delivered more significant power production increase (+261.9 to +298.6 GWh/year) with CO 2 emissions, either slightly higher (+1.5 %) or modestly lower (-4.0%), than in base case depending on heat recovery efficiency from gas turbine exhaust. Both options show feasible economics with simple payback period as low as four years under favorable combination of fuel and electricity prices and CO 2 costs. External CO 2 emissions change due to the change in unit's power production further reduces the total CO 2 emissions, strongly depending on the applied power production emission factor.

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“…Air separation in cryogenic plants is a well-established technology enabling production of pure gases from air [ 32 , 33 ] with an oxygen production capacity above 5000 Nm 3 h −1 [ 34 ]. Its basic layout includes double- or triple-stage air compression with intercooling, compressed air cooling, and removal of residual moisture together with carbon dioxide on a suitable adsorbent [ 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

“…Dry, compressed air is then routed to the cryogenic part of the plant, where a single- to triple-column design is usually adopted to obtain one or more gases of over 95 (99) % purity [ 34 ]. Thermal coupling of the columns, as well as incorporation of expanders for pressure energy recovery, help reduce the plant’s energy demand [ 32 , 37 ]. Likewise, air pre-treatment by membranes [ 38 , 39 ] or adsorbers [ 40 ] can reduce both capital and operational costs of the cryogenic part.…”

Section: Introductionmentioning

confidence: 99%

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Cutting Oxygen Production-Related Greenhouse Gas Emissions by Improved Compression Heat Management in a Cryogenic Air Separation Unit

Variny

Jediná

Rimár

et al. 2021

IJERPH

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Oxygen production in cryogenic air separation units is related to a significant carbon footprint and its supply in the medicinal sphere became critical during the recent COVID-19 crisis. An improved unit design was proposed, utilizing a part of waste heat produced during air pre-cooling and intercooling via absorption coolers, to reduce power consumption. Variable ambient air humidity impact on compressed air dryers’ regeneration was also considered. A steady-state process simulation of a model 500 t h−1 inlet cryogenic air separation unit was performed in Aspen Plus® V11. Comparison of a model without and with absorption coolers yielded an achievable reduction in power consumption for air compression and air dryer regeneration by 6 to 9% (23 to 33 GWh year−1) and a favorable simple payback period of 4 to 10 years, both depending on air pressure loss in additional heat exchangers to be installed. The resulting specific oxygen production decrease amounted to EUR 2–4.2 t−1. Emissions of major gaseous pollutants from power production were both calculated by an in-house developed thermal power plant model and adopted from literature. A power consumption cut was translated into the following annual greenhouse gas emission reduction: CO2 16 to 30 kilotons, CO 0.3 to 2.3 tons, SOx 4.7 to 187 tons and NOx 11 to 56 tons, depending on applied fossil fuel-based emission factors. Considering a more renewable energy sources-containing energy mix, annual greenhouse gas emissions decreased by 50 to over 80%, varying for individual pollutants.

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Analysis of supercritical coal fired oxy combustion power plant with cryogenic oxygen unit and turbo-compressor

Cited by 17 publications

References 24 publications

Carbon-based sorbents impregnated with iron oxides for removing mercury in energy generation processes

Carbon-based sorbents impregnated with iron oxides for removing mercury in energy generation processes

Repowering Industrial Combined Heat and Power Units: a Contribution to Cleaner Energy Production

Cutting Oxygen Production-Related Greenhouse Gas Emissions by Improved Compression Heat Management in a Cryogenic Air Separation Unit

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