Chemical Looping Combustion Power Plant Research Articles

Chemical looping combustion oxygen carrier production cost study

The objective of this study was to estimate the cost of commercial production of oxygen carriers (OCs) for large-scale application in a mature, chemical looping combustion (CLC) power generation industry. Estimates of cost were made for two production facility scenarios: (1) build and operate an on-site, OC production facility located at a 550 MW CLC power plant site; and (2) build and operate a central production facility to produce and distribute OCs to the U.S. CLC power generation industry. Two OC production techniques were addressed: mechanical mixing and co-precipitation. Representative OCs that have production raw materials with sufficient commercial availability to support a CLC industry are ilmenite, a natural OC, and four engineered OC types, Fe2O3-based, CuO-based, NiO-based, and CuFeAlO4-based, with candidate OC support materials Al2O3 and TiO2. The costs of the OC production raw materials represent the major portion of the OC product cost; the OC production cost, in dollars per kg, has been found to be nearly a linear function of the OC raw materials cost, in dollars per kg. The estimated OC product costs can be used to estimate the maximum OC loss rate yielding a designated CLC power plant cost-of-electricity (COE) target as a development guide, and it has been found that the maximum OC makeup rate, in kg per hour, achieving a designated COE reduction goal relative to a conventional pulverized coal (PC) power plant, will be nearly inversely proportional to the OC production raw materials cost, in dollars per kg.

Numerical analysis of a solar assisted chemical looping combustion combined power and sea water desalination plant

Chemical looping combustion (CLC) with solar integration for power generation is viewed as a technology that would have many economic and environmental benefits. This is because the use of solar systems to provide heating for the CLC process could lead to improved power plant performance and significant reduction of emissions. The performance of energy resources for CLC systems can be further improved via poly-generation. In this study, a novel solar assisted, methane fired CLC power plant with CO2 capture combined with waste heat utilization for sea water desalination is proposed. The plant receives a total thermal energy input of 20 MW. Ni based oxygen carrier is used for the oxygen transfer cycle. The proposed model is developed using Aspen plus software with the consideration of the conservation of mass, momentum and energy. In the study, the effect of using solar energy for the provision of the required heating for the endothermic reaction process in CLC is thoroughly examined by varying the solar share. The results show that an efficiency of 60.56% for the system can be obtained when the solar energy contributes 15–20% of total thermal energy. The system performance is relatively poor for solar share values below 15%. The system performance is further improved (approximately three percentage points) by integrating it with a desalination unit. A parametric study was conducted to ensure that the operating parameters are at their optimum levels. The study also examines the effect of certain key operational parameters for the desalination system such as sea water temperature, sea water salinity and the top brine temperature. The water production is increased with the decrease of top brine temperature and the increase of sea water temperature and salinity.

Techno-economic assessment of biomass and coal co-fueled chemical looping combustion unit integrated with supercritical CO2 cycle and Organic Rankine cycle

This study evaluates the effect of co-combustion of woody biomass and coal on the techno-economic performance of a 300 MWth in-situ gasification chemical looping combustion power plant. The circulating fluidized bed reactor system was designed and a modified macroscopic model was applied to predict the fuel conversion and the CO2 capture efficiency. The supercritical CO2 cycle and the Organic Rankine cycle were integrated with the heat sources for power generation. The results showed that increasing biomass share in the input thermal power, in addition to enhancing the CO2 capture efficiency, improves the coal conversion. Moreover, negative CO2 emissions are achieved as the biomass share exceeds 50 MWth. The net electrical efficiency of the plant is about 43.89% and grows slightly for higher biomass shares. For biomass share of 150 MWth, the CO2 capture efficiency increases from 79.27% to 90.87%. Also, the levelized cost of electricity (LCOE) rises by 15.9%–108.262 $/MWh due to higher biomass price. Despite this increased fuel cost, the LCOE is still lower than that value for the coal-fired power plant with conventional CO2 capture technology. Biomass utilization becomes more cost-effective than coal if the carbon tax is above 30 $/tCO2.

Modeling and Simulation of an Industrial-Scale 525 MWth Petcoke Chemical Looping Combustion Power Plant

This paper presents the modeling and simulation of an industrial-scale chemical looping combustion (CLC) power plant, including all process units (reactors, flue gas treatment units, heat integration, steam cycle, and CO2 compression train). A model of a 525 MWth CLC power plant was built using a rigorous representation of the solid fuel and oxygen carrier. Petcoke was considered the main fuel of interest in this study, and it is compared with other solid fuels. The flue gas compositions obtained with the model show that cleanup units are mandatory to comply with CO2 quality requirements. High levels of flue gas treatment, including 97.1% deNOx and 99.4% deSOx, are needed to achieve typical specifications for captured CO2. This is mainly due to the high level of contaminants in the fuel, but also to the absence of nitrogen in the CLC flue gas, thus resulting in higher concentrations for all substances. The high level of flue gas treatment is thus one of the important challenges for solid fuel combustion in CLC. The overall CO2 capture efficiency of the plant is estimated to be as high as 94%. Regarding the energy balance, a process net efficiency of 38% is obtained. Comparing the results with other available technologies shows that CLC exhibits one of the highest net plant efficiencies and carbon capture rates. CLC is thus a promising technology to produce clean energy from solid fuels. Finally, based on a sensitivity analysis, it is shown that process efficiency is mainly affected by the design and performance of the CLC furnace, the steam injection rate in the fuel reactor, the char separation efficiency, and the excess oxygen in the air reactor.

Process modelling and techno-economic analysis of a 550MWe chemical looping power plant with victorian brown coal

This study compares the process and economic performance of a 550 MWe chemical looping combustion (CLC) based power plant and a pulverized coal-fired power plant (CFPP), both fuelled by Victorian brown coal. Process simulation was conducted using Aspen Plus® to quantify mass and energy balances and performance indicators. Performance and economic parameters of the simulated CLC plant and conventional supercritical CFPP without CO2 capture were also compared to DOE/NETL's 550 MWe base power plant (case 12A) and Babcock & Wilcock's 550 MWe coal-direct chemical looping (CDCL) power plant. CLC plant with VBC provided 32.11% net efficiency (based on HHV) with 93% CO2 capture efficiency while the conventional CFPP showed 37.78%. Deep integration of utility heat from multistage CO2 compression unit restricted the energy penalty of CLC to 15% compared to conventional CFPP with Victorian brown coal. Levelised cost of electricity (LCOE) of chemical looping combustion-based plant was calculated to be 146 $/MWh, which is 28.08% higher than the conventional CFPP with VBC. Cost of CO2 avoided for CLC plant was calculated to be 45.25 $/ton of CO2. This study showed that a 550 MWe commercial-scale CLC power plant with VBC can achieve DOE's goal of 90% CO2 capture at a less than 35% increase in the levelised cost of electricity.

CO2 capture and utilization from supercritical coal direct chemical looping combustion power plant – Comprehensive analysis of different case studies

Carbon dioxide utilization has gained much attention as a greenhouse gas (GHG) abatement strategy complementary to carbon dioxide storage. Fossil fuel (including coal) based power plants are the large emitters of carbon dioxide as a single sector. Chemical looping combustion is an inherent CO2 capture technology and can also be used for hydrogen production. The captured CO2 and H2 can be used as reactants for synthesis of various products. Present study explores the carbon dioxide utilization (CDU) from the coal direct chemical looping (CDCL) combustion plant with power and hydrogen co-generation to produce four valuable products as four different cases. These case studies include formic acid (FA), methane, methanol, and dimethyl ether (DME) synthesis plants. The performance of these integrated plants is evaluated based on a comprehensive assessment including energy, exergy, ecological, economic and life cycle (4-E&L) analyses. Levelised cost of the products (LCOP) of CDU plants are estimated and compared. Results of 4-E&L analyses show that the CDCL plant with formic acid synthesis is the most favourable option with 100% CO2 utilization efficiency. At the end, the LCOPs estimated from the proposed CDU integrated CLC based power plant are compared against the LCOPs obtained from two different approaches using hydrogen production from solid oxide electrolysis cell (SOEC). The proposed approach is found to be resulting in less LCOP compared to the other approaches.

Pinch combined with exergy analysis for heat exchange network and techno-economic evaluation of coal chemical looping combustion power plant with CO2 capture

A coal chemical looping combustion (CLC) power plant (600 MW) with CO2 capture was established and validated. The key operation parameters and conditions for the coal chemical looping combustion process were tested and optimized. Heat exchange network (HEN) was established and optimized using the combined pinch and exergy analysis method for matching and integrating different levels or grade energy, from flue gas and exhaust steam waste heat, in coal chemical looping combustion power plant to maximize the energy efficiency output. Followed by conducting a techno-economic evaluation and exergy distribution analysis which showed that the net energy efficiency of the CLC power plant (34.8 %, improved by 1.9 %) is 2.4 % higher than the monoethanolamine (MEA)-based ultra-supercritical coal power plant (32.4 %) with the same CO2 capture ratio (90 %). The CLC power plant also provides a lower cost of electricity (0.088–0.127 $/kWh) and less coal consumption (381 g/kWh), compared to the MEA-based power plant (0.143 $/kWh, 408 g/kWh). The cost and energy penalty of CO2 enrichment and separation are less when compared to traditional MEA-based ultra-supercritical coal power plants due to the intrinsic nature of in-suit CO2 capture, the lower exergy destruction in the chemical looping combustion process, and sufficient energy integration and recovery from HEN.

Coupling chemical looping combustion of solid fuels with advanced steam cycles for CO2 capture: A process modelling study

Chemical looping combustion is a cost-competitive solution for producing low carbon electricity. In this paper, we investigate by means of a process modelling study, the coupling of chemical looping combustion of solid fuels with advanced steam-based power cycles, viz. supercritical, ultra-supercritical and advanced ultra-supercritical Rankine cycles. The energy and exergy efficiencies of the various chemical looping combustion power plant configurations are compared against the reference plants without carbon capture. Our models incorporate practical considerations for reactor design. With an upper operating temperature limit of 950 °C, the maximum efficiencies achievable by integrated gasification combined cycle chemical looping combustion (IGCC–CLC) and in situ gasification chemical looping combustion power plants (iG-CLC) are 41.3% and 41.5%, respectively. Overall, iG-CLC emerges as the most efficient CLC configuration. Comparing to an integrated gasification combined cycle without carbon capture, the energy efficiency penalties for capturing CO2 from iG-CLC coupled with subcritical, supercritical, ultra-supercritical or advanced ultra-supercritical steam cycles are 5.1%, 5.0%, 5.2% or 13.0%, respectively. The biomass-fired chemical looping combustion power plants also show low energy efficiency penalties (<2.5%) compared to the reference biomass power plants without CO2 capture. Our modelling results suggest that chemical looping combustion will remain an attractive carbon capture technology for solid fuel power plants, in a future when supercritical steam turbines become the norm.

4-E and life cycle analyses of a supercritical coal direct chemical looping combustion power plant with hydrogen and power co-generation

Present work evaluates hydrogen and power co-generation of a supercritical (SuperC) steam based coal direct chemical looping combustion (CDCLC) power plant using high ash coal. Different cases of hydrogen co-generation have been considered with 0–900 MW of hydrogen production and 462-157 MW of electric power generation. In this study, CDCLC plant using iron based bimetallic oxygen carrier with co-generation is compared with CDCLC plant without co-generation and conventional SuperC coal fired plant without CO2 capture. The overall performance of all cases is compared based on 4-E (energy, exergy, ecological, economic) and life cycle analyses (LCA). A sensitivity analysis is conducted to optimise the operating conditions of CLC reactors. The levelised cost of hydrogen from CDCLC plant with 50% hydrogen and 50% power co-generation is estimated to be 1.94 €/kg. Further, the LCA conducted on the cogeneration plant by considering important stages reveals that the CDCLC plant stage is the highest contributor in greenhouse gas emissions (GHG) emissions and primary fossil energy consumption (PFEC). The key outcome of the study is that the CDCLC power plant configuration with higher hydrogen co-generation is energetically, exergetically, environmentally and economically efficient.

Formic acid synthesis – a case study of CO2 utilization from coal direct chemical looping combustion power plant

ABSTRACT Chemical looping combustion (CLC) is an encouraging technology for hydrogen and power co-generation with efficient CO2 capture. Utilization of the captured CO2 is a much more important task to realize negative CO2 emissions. The objective of the work is to explore a case study of carbon dioxide utilization (CDU) in the form of formic acid synthesis using the captured CO2 and co-generated H2 from coal direct chemical looping (CDCL) power plant. Steady-state simulations are performed on the power and H2 co-generation CDCL plant integrated with formic acid synthesis and presented a comparison of overall performance of the CDCL plants with and without CDU integration. The simulation results revealed that the formic acid synthesis integrated CDCL plant avoids release of 62.49 kg.CO2/GJ of fuel input into the environment and utilizes the captured CO2 completely with the net electrical efficiency penalty of 5.8%.

Environmental impacts of a chemical looping combustion power plant

Chemical Looping Combustion (CLC) is a promising CO2 capture option since it inherently separates CO2 from other flue components, theoretically with low energy penalty. Here, a Life Cycle Assessment model was developed of a theoretical hybrid CLC (HCLC) power plant facility utilising experimental data for CuO based oxygen carrier (OC) production and oxygen capacity. Power plant models with and without post-combustion CO2 capture, recognised as the most mature capture technology, acted as environmental performance targets. Results show that when OC is produced at lab-scale without optimisation, almost all (>99.9%) lifecycle impacts per kWh electricity from an HCLC plant derive from the specific OC material used, giving a total of ˜700 kg CO2eq/kWh. This is related to high electrical input required for OC processing, as well as high OC losses during production and from plant waste. Only when processing parameters are optimised and OC recycling from plant waste is implemented - reducing fresh OC needs – is the environmental impact lower than the conventional technologies studied (e.g. 0.2 kg CO2 eq/kWh vs. ˜0.3-1 kg CO2 eq/kWh, respectively). Further research should thus focus on identifying OCs that do not require energy intensive processing and can endure repeated cycles, allowing for recycling.

Design and techno-economic optimization of a rotary chemical looping combustion power plant with CO2 capture

The rotary chemical looping combustion reactor design - which utilizes oxygen carriers in a matrix of micro channels for indirect fuel conversion - provides a viable path for fossil-based electric power generation with CO2 capture. Its thermally integrated matrix of micro channels minimizes irreversibilities associated with heat transfer in the reactor, and establishes multiscale coupling between oxygen carrier kinetics, reactor geometry and plant operating conditions. In this study, we implement an optimization framework that exploits this multiscale coupling for simultaneous reactor design and power plant economic optimization. Results for the methane-fueled power plant reveal optimized thermal efficiencies of 54–56% for a rotary chemical looping recuperative Brayton cycle plant, with compressor pressure ratio in the 3–7 range. By switching from an efficiency to an economic objective, we identified solutions that reduced electricity cost by about 11%; by performing scaling and technology maturity projections, we show competitive economics for the rotary chemical looping plant with CO2 capture.

Techno-economic analysis of a poly-generation solar-assisted chemical looping combustion power plant

Chemical looping combustion (CLC) is a promising technique for CO2 capture with low energy penalty and low cost. In addition to capturing CO2, the solar-assisted CLC process results in the production of significant amount of exhaust waste heat which could be utilized for a variety of purposes. This paper outlines a detailed techno-economic analysis of a solar-assisted natural gas fired CLC power plant with waste heat utilization for absorption chilling purpose. This is particularly important for hot regions such as the United Arab Emirates (UAE) where a significant amount of energy is used for cooling purposes. The power plant studied is about 550 MWe net output power. The study was conducted by developing an Aspen Plus system model. The model was used to calculate the heat recovery efficiency, the absorption chilling system coefficient of performance and the plant efficiency. The economic performance of the plant was analyzed by calculating the cost of electricity, the return on investment and the cost of CO2 capture. The analysis shows that the poly-generation solar-assisted CLC system had a plant efficiency of 63.4%, waste heat utilization of 49%, electricity cost of 4.9 cents/kWh and the return on investment of 3.98 years at prevalent prices of the plant input materials and a capacity factor of 85 percent.

Power Generation Based on Chemical Looping Combustion: Will It Qualify To Reduce Greenhouse Gas Emissions from Life-Cycle Assessment?

The aim of this study is to disclose the relationship between the global warming impact (GWI) of chemical looping combustion (CLC) and four essential factors to investigate the environmental sustainability of this technology, namely, the types of oxygen carrier (OC), the lifetime of the OC, the global warming potential (GWP) of the OC, and thermodynamic performances of the CLC power facility. At designed conditions, the GWI of the CLC power plant is expected to be 63.4 kg of CO2 eq/(MW h) by using a Ni-based OC. The lifetime of the OC has a major influence on the GWI before it reaches 4000 h, and a further increment of OC lifetime presents a tender influence on reducing the GWI, whereas, at such a condition, the GWP of the OC presents obvious influences. A higher CLC system efficiency contributes to lower GWI; thus, integrating CLC with a more efficient combined cycle rather than the steam cycle and screening high-temperature resistance OCs should be focused on for future research needs.

Tech-economic assessment of second-generation CCS: Chemical looping combustion

Chemical looping combustion (CLC) is regarded as the most promising technology for CO2 capture to mitigate greenhouse gas effect. In this work, a technical and economic performance of CH4-feed CLC power plant by means of utilizing promising nickel-, copper-, and ilmenite-based oxygen carriers is studied. Nickel-based CLC power plant has the highest net power efficiency of 50.14%, followed by 48.02% for ilmenite-based case and 45.59% for copper-based case. By contrast nickel-based case has a specific CO2 emission of 1.44 kg/MW h, which is dramatically lower than the referenced NGCC with CCS system (40.10 kg/MW h). The economic analyse reveal nickel-based case is most economic-benefits due to the lowest cost of electricity (COE) of 71.66€/MW h, approximately 0.32 €/MW h and 13.06 €/MW h COE reduction benefits have been increased in comparison with ilmenite-based and copper-based case, respectively. The natural gas price has an important influence on COE, as approximately 49.73%, 48.60% and 56.30% of COE enhancement is expected with the natural gas price ranging in 4–8 €/GJ for nickel-based, copper-based, and ilmenite-based case, respectively. Finally a comparison between NGCC and CLC-related power system in terms of economic performance further demonstrates the feasibility of the latter system.

Achieving Negative Emissions with the Most Promising Business Case for Bio-CCS in Power and CHP Production

The urgency for significant reductions in global greenhouse gas (GHG) emissions highlights the importance of carbon sinks, i.e. solutions that can remove CO2 from the atmosphere, and the possibility for offsetting historical emissions. The later the global GHG emissions turn to decline, the greater is the need for sinks or so called “negative emissions”. Achieving negative CO2 emissions is possible by applying carbon capture in processes using biomass as feedstock (bio-CCS).Electricity production efficiency of chemical looping combustion (CLC) power plant is higher than in power plants based on solid fuel and other CO2 capture technologies. The higher efficiency of CLC in comparison to other CCS technologies emphasizes the cost benefit of bio-CLC in terms of both, merit order and overall economic feasibility. The advantage of combined heat and power production (CHP) over the sole power production has been recognised also in the case of CCS applications. By CHP, process efficiencies over 90% (on LHV basis) are possible and efficiency penalties of the CCS processes can be minimised as decreased efficiency in power production can be compensated by additional heat production.In this paper, the most feasible concept for bio-CCS in power and CHP production is presented based on improved efficiency, negative emissions and benefits of CHP within Nordic bioenergy context. Techno-economic analyses of industrial scale CLC power plant and CHP plant are presented in different market situations. Feasibility of CLC investment and the utilization of such plants are investigated and compared to oxy-fuel and air combustion references in a fictive energy system. In general, the smaller scale is often limiting biomass applications, CLC, CHP and utilisation of CO2. In the presented bio-CLC concept, all of these advantages are combined in a scale which is realistic for commercial application.

Fuel reactor modelling for chemical looping combustion: From micro-scale to macro-scale

Chemical looping combustion (CLC) is a promising technology able to convert energy whilst managing CO2 emissions. The CLC system is composed of two fluidised bed reactors working in different hydrodynamic regimes. Transition metal particles circulate between the two reactors to carry out the oxidation and reduction reactions with air and fuel, respectively. This technology, which might be embedded into a fuel power plant for electricity generation, would lead to higher thermal plant efficiency than other technologies for carbon capture. The main concern about the technology is related to the total solid inventory needed to achieve full gas conversion which is believed to count for most of the cost of a CLC power plant. Thus, noteworthy attention is given to the modelling of the reactors to optimise the solid inventory and thus the plant’s cost. In this work, a 2D computational fluid dynamics (CFD) analysis of the fuel reactor is carried out. The results, in terms of the effect of the different kinetic and hydrodynamic conditions on the outlet gas conversion, are compared with the results using a macro-scale model implemented in Aspen Plus. Based on the micro scale (CFD) outcomes, the macro scale model is enhanced to capture the main physics influencing the performance of the fuel reactor. The latter is considered more suited as power plant simulator for thermal efficiency and cost estimations.

Techno-economic investigation of a chemical looping combustion based power plant.

Among the well-known state-of-the-art technologies for CO2 capture, Chemical Looping Combustion (CLC) stands out for its potential to capture CO2 efficiently from a fuel power plant. CLC involves the combustion of carbonaceous fuel such as coal-derived syngas or natural gas via a redox chemical reaction with a solid oxygen carrier circulating between two fluidised beds. Avoided NOx emissions, high CO2 capture and thermal efficiency are the key concepts that make worth the investigation of this technology. One of the main issues about CLC might concern the impact of the solid metal oxides price and lifetime on the Levelised Cost Of the Electricity (LCOE). A natural gas fired power plant embedding a CLC unit is presented in this work. Detailed fluidised bed models are implemented in Aspen Plus software. Kinetics and hydrodynamics are taken into account to evaluate their effect on the total solid inventory required for full fuel conversion. The models are incorporated into a power plant and a detailed economic evaluation is undertaken by varying two relevant parameters: fuel price and lifetime of the solid particles. The effect of these parameters on the LCOE is investigated and a comparison between CLC and a post-combustion technology employing amines (e.g. monoethanolamine, MEA) is presented. It is shown that the CLC power plant under study leads to a lower LCOE compared to the current MEA post-combustion solution.

Reactor design and operation strategies for a large-scale packed-bed CLC power plant with coal syngas

This paper deals with the design and operation strategies of dynamically operated packed-bed reactors (PBRs) of a chemical looping combustion (CLC) system included in an integrated gasification combined cycle (IGCC) for electric power generation with low CO2 emission from coal. The CLC reactors, that employ ilmenite as oxygen carrier, are operated sequentially across the following phases: oxidation, purge, reduction and heat removal.Two different layout configurations have been considered: in the first configuration, all the inlet streams are fed to the PBRs from the same side (“co-current”), while in the second configuration the coal syngas for the reduction and the N2-rich stream for the heat removal phases are fed from the opposite side (“counter-current”). The number of reactors required for continuous operation of a large-scale power plant has been assessed to comply with an 8% maximum pressure drop across the reactor for different internal reactor diameters and reactor lengths. A sensitivity analysis on the number of reactors has been carried out by varying the particle size, while accounting for the effect of internal mass transfer limitations. A novel strategy for the dynamic operation of the reactors is proposed to reduce gas temperature fluctuations at the inlet of turbomachines and heat exchangers by switching the reactors in parallel with a proper phased displacement. A comprehensive analysis has been carried out on the dynamic reactor behaviour by using a one-dimensional adiabatic reactor model.The outcomes from the reactor model have been used to calculate the resulting conditions of the gases that are leaving the reactors operated in parallel. The results obtained indicated that 14–16 units (for the co-current and counter-current configuration respectively) with 5.5m of internal diameter and 11m of length are required for continuous operation of a 350–400MWe coal-fired power plant. Although packed-bed reactors are dynamically operated, the gases released by the CLC units do not exhibit significant transient temperature changes (only about 6°C for the gas turbine) and the system seems promising for future large-scale power plant applications with integrated CO2 capture.

Feasibility of Solid Fuel CLC Plant Investment in the Future Energy Systems Including High Share of Solar and Wind

It is predicted that share of solar and wind energy will be increased in the future energy systems. The competitiveness of these technologies is further improved if strict climate policy and for example consequent high costs for CO2 emissions or emission performance standards will be applied, leading to increased electricity prices. This will bring demand for more flexible large scale energy production and/or energy storages due to the intermittency of solar and wind energy production at different timeframes, for example between day and night and different seasons. In addition, it is notable that future integration of electricity markets and grids will expand the area impacted by intermittent renewables. Possible and predicted high economic value for CO2 emissions and emission standards are also a rationale for the development of CCS technologies. After the investment, variable operational expenditures of solar and wind power are low in comparison with other low carbon technologies and therefore these plants are utilised before others. This will impact also on the utilisation rates of plants equipped with CCS. In this paper techno-economic analyses of industrial scale Chemical Looping Combustion (CLC) power plant are presented in different market situations. Feasibility of CLC investment and the utilization of such plant is investigated and compared to oxyfuel and air combustion references in energy system which contain high share of solar and wind power. The CC-Skynet™ toolkit, created by VTT during Finnish CCS projects, enables comparison of economic feasibility of different CCS technologies in different market scenarios, including varying prices for electricity, CO2 emission allowances, fuels, plant utilisation rates, etc. In addition, in the case of CLC, sensitivity analysis are possible also for example for prices of different oxygen carriers, investments etc. The toolkit is highly versatile but it does not include modelling of any physical phenomena which are required as inputs. The economics of CCS are evaluated from investor's (local energy company) point of view including the effects on the existing energy system. Effect of CCS on greenhouse gas (GHG) emissions and operation economics of the CCS cases are compared to the reference energy system with varying parameters of operation. Electricity production efficiency of CLC power plant is higher than in power plants based on solid fuel and other CO2 capture technologies, because CLC does not require large air separation unit or solvent regeneration. Higher net efficiency in electricity production by CLC results lower specific production costs in comparison to other CCS technologies. This probably leads to higher utilisation rate for CLC which is important for example in terms of payback time for the investment or required break- even price for CO2 emissions. Results show that CLC may be more competitive in comparison to other CCS technologies due to higher electrical efficiency. Economic feasibility is dependent on several factors which are uncertain in the case of future energy system. However, it is probable that high CO2 prices lead to increased electric price such that electrical efficiency has large dominant effect on feasibility. Investment costs do not dominate in comparison between CCS technologies. Feasibility of CCS is different between geographical locations due sensitivity of transport and storage.