Oxy-combustion Conditions Research Articles

Flow, combustion and species fields of premixed CH4/H2/CO syngas oxy-flames on a swirl burner: Effects of syngas composition

Addressing burning characteristics of syngas under oxy-combustion conditions in substantially CO2-diluted combustion environment for gas turbine combustion applications has rarely been reported. A detailed modeling study was performed over a broad range of syngas compositions at fixed inlet flow velocity of 6 m/s, fixed equivalence ratio of 0.42, and fixed oxygen fraction (OF) of 60% (by vol.). For validating the numerical model, the calculated results were compared against experimental results recorded from the same physical combustion setup. The effects of syngas composition on flow field, laminar flame speed (LFS), flame thickness, adiabatic flame temperature (AFT), combustor power density (PD), thermal power (TP), and species distributions were investigated. Adiabatic flame temperature increased from 2312 to 2388 K, LFS increased from 0.53 to 1.32 m/s, PD reduced from 2854 to 2672 kW/m3, and TP decreased from 4.0 to 3.7 kW when the hydrogen fraction (HF) was changed from 0 to 80%.When the HF was reduced from 90% to 10%, with excluding CH4, the AFT increased from 2447 to 2560 K, the LFS decreased from 2.01 to 0.46 m/s, the TP increased from 3.64 to 4.1 kW, and the PD increased from 2620 to 2923 kw/m3.

Investigation of thermal radiation under pressurized oxy-combustion conditions

Investigation of thermal radiation under pressurized oxy-combustion conditions

NOx formation from ammonia, and its effects on oxy-combustion of hydrocarbon fuels under supercritical-CO2 conditions

NOx formation from ammonia impurities and its effects on fuel oxidation is not well understood for high-pressure supercritical CO2 oxy-combustion conditions. This effect is investigated computationally and experimentally in the present work. A chemical kinetic analysis revealed that the reaction between NH radical and CO2 plays an important role in determining the rate of NOx formation at these conditions. It was also found that a significant reduction in the NOx formation from ammonia oxidation occurs with sCO2 oxy-combustion at 300 atm when compared to traditional gas turbine conditions. A chemical reactor network simulation of realistic sCO2 cycle conditions confirmed the reduced NOx emissions. Monte Carlo simulations used to study the sensitivity of model input variables on the emissions showed that CO2 cooling impacts the CO emissions while most of the NOx are generated in the flame zone. Uncertainty analysis showed that the reaction between NH and CO2 to form HNO radical is an important contributor to the model uncertainty under sCO2 oxy-combustion conditions.The presence of combustion-generated NOx in the recycled-CO2 can impact the fuel oxidation in the primary zone of the combustor. Hence, to understand the effect of NOx on ignition, high-pressure shock tube ignition delay time experiments were performed at conditions relevant to sCO2 oxy-combustion. The ignition delay time measurements were made for syngas and CH4 fuels with and without NO addition under supercritical conditions using CO2 as the bulk diluent at nominal pressures around 100 atm. Experimental data showed that the presence of NO promotes ignition at these conditions. The effect is more pronounced for CH4 compared to syngas. Nitric oxide acts as a chemical catalyst to promote ignition by increasing the combustion radical pool. The catalytic cycle involves the conversion of NO to NO2 which also contributes to CH4 oxidation by H-atom abstraction to generate CH3 radical.

Thermal performance and heat transfer characteristics analyses of oxy-biogas combustion in a swirl stabilized boiler under various oxidizing environments

The present study deals with the numerical simulation of biogas diffusion flame in swirl stabilized boiler under different oxy-combustion conditions. The current study aims to investigate the impacts of O2/CO2 and O2/H2O oxidizer mixtures on the thermal and combustion characteristics of biogas flame in the boiler. Accordingly, the combustion simulation process is performed by the k-ω SST turbulence, DO radiation, and Flamelet Generated Manifold (FGM) combustion models. Results showed that by the increasing swirl angle, heat flux uniformity factor (UF) enhances by 26.8% and 129.9% for O2/CO2 and O2/H2O combustion modes, respectively. Also, by raising O2%, the flame peak temperature increases from 1832 K to 2171 K in O2/CO2 mode and from 2053 K to 2283 K in O2/H2O case. It was observed that the maximum of UF on the boiler wall could be achieved to be 0.81 at SA 60° in oxy-steam mode. Moreover, the UF value significantly increases by 39.42% on the boiler wall by transitioning from O2/CO2 to O2/H2O combustion mode at higher O2 content. Finally, results imply that there is no need to increase O2 content beyond 50% to reach higher heat transfer rate in O2/H2O mode because this would result in additional costs.

Economic, environmental and exergy analysis of the decarbonisation of cement production cycle

The aim of this study is to analyze the exergetic, environmental, and economic impact of the use of alternative fuels (Plasmix), instead of coal on the clinker production to valorise a non-recyclable waste and to limit global CO2 emissions. The cement production process was implemented in AspenPlus® environment, simulating different scenarios with the possibility to conduct the non recyclable plastic waste incineration in oxy-combustion conditions. Three scenarios were considered: without and with flue gas recirculation from the pre-heating tower and the oxy-combustion layout. Sensitive analyses were carried out to optimize cyclonic pre-heater tower working. Exergetic and economic analyses were performed, and the relevant impacts on economic profitability were analysed. The study reports the advantages and disadvantages of the different scenarios in terms of exergy efficiency, energy requirements, economic impact and pollutants emissions savings. Oxy-combustion layout resulted in 18.4% savings in terms of CO2 emissions but, at the same time, a lower Return of Investment (11.79%) with respect to the scenario with flue gas recirculation (11.82%). The exergy analysis of third scenario re returned the maximum obtainable value of the exergy efficiency (58.4%).

Volatile Releasing Characteristics of Pulverized Coals under Moderate or Intense Low-Oxygen Dilution Oxy-Combustion Conditions in a Flat-Flame Assisted Entrained Flow Reactor

There has been little research on volatile releasing characteristics of pulverized coals under moderate or intense low-oxygen dilution (MILD) oxy-combustion (MO) conditions. For the first time, volatile releasing characteristics of bituminous coal and semi-anthracite under both MILD air-combustion (MA) and MO conditions were investigated using a flat-flame assisted entrained flow reactor. Both heating rate (~105 K/s) and residence time (65 ms) were carefully selected to mimic the conditions in typical industrial boilers. The combustion processes and properties of the volatiles were characterized through direct observation and char analysis. The results showed that the lower diffusion rate of the volatile in CO2 resulted in the decreasing of the volatile envelope flame size and a longer volatile burnout time (more than 20%). For bituminous coal (volatile content of 25%), the lower amount of apparent volatile yield under MO conditions reduced the heating value of the volatile. For semi-anthracite coal (volatile content of 7%), the short devolatilization time led to char-CO2 gasification reaction, which increased the apparent volatile yield and the heating value of the volatile by 47% and the volatile-N by 19%. This paper indeed provided new insight into the MILD oxy-combustion of solid fuels.

Effectiveness of bed additives in abating agglomeration during biomass air/oxy combustion in a fluidised bed combustor

In this study, molochite (calcined kaolin) and dolomite with particle sizes (ca.1 mm) similar to those of the sand bed materials of industrial-scale fluidised beds, rather than powders which were normally used by previous studies, were investigated as the bed additives to counter agglomeration with the combustion of wheat straw and miscanthus pellets in a 20 kWth bubbling fluidised bed combustor under both conventional air combustion and oxy-fuel combustion conditions. The performance of the additives in abating agglomeration was compared to that achieved with another agglomeration countermeasure, lime addition to fuel. Dolomite was found to be superior to molochite in terms of prolonging defluidisation time when firing wheat straw. When firing miscanthus, similar effects of these two bed additives on defluidisation time were observed. The most significant improvement to the combustion performance was achieved by lime addition to fuel for both fuels. Moreover, the oxy-fuel combustion atmosphere showed a great impact on the effectiveness of dolomite but little influence on the effectiveness of molochite. The agglomeration samples were analysed by CAMSIZER, XRD and SEM/EDX and the results were used to derive the possible anti-agglomeration mechanisms of the additives under both air and oxy combustion conditions.

The Role of Alkaline/alkaline Earth Metal Oxides in CO2 Capture: A Concise Review

Reducing the concentration of CO2 from the atmosphere has attracted a lot of attention given the rapid level of industrialization in the world. Process Industries are one of the major contributors to this pollution in terms of the incessant release of CO2 from flue gas streams. In recent times metal oxides have received a lot of attention as potential adsorbents for solving this problem.They find application in post-, pre-, and oxy-combustion conditions. Their basic sites plus a lower charge to radius ratio increase their ionic nature and site basicity and facilitate the capture of this pernicious gas from flue gas streams by reacting to form carbonates, which when heated liberates an almost pure stream of CO2 which can be sequestered, thereby, aiding the release of environmentally benign flue gas streams to the atmosphere. This work takes a concise review of these metal oxides that have been widely studied.

Exergy analysis of municipal solid waste incineration processes: The use of O2-enriched air and the oxy-combustion process

This work provides a complete exergy analysis of municipal solid waste incineration process. The work was based on a previous study, and was enriched considering the possibility to increase the O2 %mol in the combustion air, up to oxy-combustion conditions. Two configurations have been considered, with and without flue gas recirculation, and the environmental aspects of oxy-combustion were taken into account, as well as its exergetic cost. The flue gas was used in a boiler for high pressure steam production, expanded in three turbines for power generation. The exergy analysis allowed to identify the process units characterized by major irreversibility and exergy loss as waste. The results showed that the flue gas recirculation led to an exergy efficiency increase of the whole process of about 3% (from 31.1% up to 34% at adiabatic flame temperature equal to 1200 °C). The O2 %mol increase in the combustion air allowed to reduce the flue gas flowrate, leading to environmental benefits. Oxygen-enriched air adoption led to limited exergetic improvements, due to the exergy cost of the air separation unit. The specific energy generation of the plant increased at fixed combustion chamber temperature adopting flue gas recirculation.

Computational investigation of oxy-combustion of pulverized coal and biomass in a swirl burner

Swirling pulverized coal and biomass flames are computationally investigated for oxy-combustion. The two-phase flow is described by a Eulerian-Eulerian approach. For radiation, the absorption coefficient is approximated by superposing particle and gas contributions, considering oxy-combustion conditions for the latter. Turbulence is modelled within a URANS framework, using the standard k-ε model and Reynolds Stress Model (RSM). It is observed that RSM captures the unsteady dynamics of the coherent structures, whereas they are not captured by k-ε model. Predicted velocities are compared with measurements. It is observed that the RSM predictions are in a better agreement with the measurements compared to the k-ε model. The discrepancy between the predictions and measurements can most clearly be quantified in terms of the peak values of the axial velocity in the forward flow region enveloping the inner recirculation zone. The calculations constantly underpredict the measurements. On the average, this is about 32% for the RSM and 52% for the k-ε model, for both flames. The biomass flame is predicted nearly twice as long compared to the coal flame. As means of verification, the coal flame is additionally calculated using a classical Eulerian-Lagrangian two-phase formulation, leading to quite similar results to the Eulerian-Eulerian formulation.

Performance study on Ca-based sorbents for sequential CO2 and SO2 capture in a bubbling fluidised bed

High temperature CO2 and SO2 sequential capture in a bubbling fluidised bed was investigated using a natural limestone and synthetic composite pellets. Calcination was conducted under oxy-combustion conditions, while carbonation and sulphation occurred in an air-combustion atmosphere. The goal of sequential capture of CO2/SO2 is to desulphurise the flue gas first, followed by cyclic carbonation and calcination. Here, fresh sorbent is first used in the cyclic calcination/carbonation process and then the spent sorbent is sent for sulphation.The pellet carrying capacity is 0.29 g CO2/g sorbents for the first cycle, while that of natural limestone is about 0.45 g CO2/g sorbents. The carrying capacity first fell and then finally plateaued around 0.10 and 0.12 g CO2/g sorbents for limestone and pellets respectively. The SO2 carrying capacity for limestone and pellets after 20 cycles of CO2 capture was 0.17 and 0.22 g SO2/g sorbents respectively. This indicates that the sorbent spent in CO2 capture can be effectively reused for SO2 removal. Abrasion was observed to be the main mode of attrition, but some agglomeration was also found with increasing number of cycles and this may be a concern in the use of Ca-based sorbent for CO2 or SO2 fluidised bed capture.

Influence of potassium carbonate catalysis and pre-treatment atmosphere on the textural, structural, and chemical properties of high and low rank coals blended with biomass and their reactivity under conventional and oxy-combustion processes

The structural, textural, and chemical properties of coal/biomass char blends obtained under N2 and CO2 atmospheres at 700 °C were evaluated when potassium carbonate (K2CO3) catalyst was added at 2, 5 and, 10 wt%. Char blend properties were investigated by N2 adsorption, Raman spectroscopy, and X-ray photoelectron spectroscopy. Reactivity under oxy-combustion (21% O2 + 79% CO2) and conventional combustion (21% O2 + 79% N2) conditions was studied by thermogravimetry. Significant differences in characteristics and reactivity were evident between blends containing high rank anthracite coal (AC/B) and low rank lignite coal (LC/B). For AC/B chars, K2CO3 loading up to 10 wt% raised the combustion rate and decreased the activation energy over the entire conversion range under both combustion processes. However, for LC/B chars, K2CO3 loading above 2 wt% resulted in lower combustion rate and higher activation energy. The oxy-combustion process facilitated lower activation energies for both char blends compared with conventional combustion. When CO2 was used during the devolatilization process, activation energies were lower than with a N2 atmosphere, which is attributed to the gasification reaction in the blends favoring the subsequent combustion process. These results demonstrate the positive role of CO2 (the balance gas during oxy-combustion) in the thermochemical transformation of char blends.

Hot corrosion behaviors of TP347H and HR3C stainless steel with KCl deposit in oxy-biomass combustion

Oxy-combustion is one of the most promising technologies for carbon capture and sequestration. When CO2-neutral biomass is burned under oxy-combustion conditions, named “oxy-biomass combustion” a negative CO2 emission can be achieved. However, the high content of potassium and chlorine in biomass results in sever ash deposition and corrosion in air fired furnaces, which are further aggravated in oxy-combustion mode due to the enrichment of corrosive species by flue gas recycle. In this paper, the hot corrosion behaviors and mechanism of two representative materials (TP347H, HR3C) used for superheaters in furnaces are studied. The effects of oxy-combustion atmosphere, KCl deposition, effect of SO2, effect of water vapor, and temperature on the corrosion kinetics at the starting stage are investigated. The corrosion severity of the materials was determined using the weight gain method, and the microstructures and chemical compositions of corrosion layers were characterized by the scanning electron microscopy with energy dispersive spectroscopy, and X-ray diffraction. The results show that the hot corrosion rate is significantly sped up by KCl deposition, more than five times the gas corrosion rate under the same gas composition and temperature. HR3C with higher Cr and Ni contents is more likely to form Cr enrichment on the interface between the corrosion layer and the substrate than TP347H, resulting in stronger resistance to the hot corrosion than TP347H. When the corrosion atmosphere is changed from air-combustion to oxy-combustion, the hot corrosion rate is reduced with a denser Cr oxide film and less metal sulfides. The increase of temperature in the presence of KCl deposition significantly affects the hot corrosion rate, e.g. the corrosion rate at 650 °C is 16 times higher than that at 450 °C. Water vapor and SO2 concentrations have opposite influences on the hot corrosion, respectively. Compared to the dry environment, a high-humidity environment decreases the hot corrosion rate; however, a higher SO2 concentration facilitates the sulfation of KCl deposits, leading to stronger damage to the chromium oxide film and thereby an increased hot corrosion rate.

High-temperature corrosion of water-wall tubes in oxy-combustion atmosphere

Oxy-combustion is one of the most promising technology for CO2 capture in coal-fired power plants. However, under oxy-combustion conditions, the concentrations of acid gas species are significantly increased due to the introduction of the flue gas recycle, which aggravates the high-temperature corrosion of heat exchanger materials in boilers. In this study, the early-stage high-temperature corrosion (0–16 h) of two representative water-wall tube materials (20G, 12Cr1MoV) is experimentally tested in a lab-scale furnace with the simulated oxy-combustion atmosphere. The effects of material, temperature, CO2, H2O, SO2, H2S and CO atmospheres on high-temperature corrosion behaviors is investigated. The micro-morphologies and compositions of corrosion layers are characterized by scanning electron microscope with energy dispersive X-ray spectra (SEM-EDS) and X-ray diffraction (XRD). Kinetic analysis shows that the high concentration of CO2 accelerates high-temperature corrosion of water wall materials. In the simulated oxy-fuel combustion atmosphere (CO2/O2/SO2), the mass gain rate can be enhanced by 10%–30% compared to the conventional air combustion atmosphere (N2/O2/SO2), and the major composition of oxide scale is magnetite. In a reducing oxy-fuel atmosphere (CO2/CO/SO2/H2S), the major components of oxide scale are magnetite and ferrous sulfide. The high concentration of moisture in the atmosphere accelerated the corrosion rate by 10–30%. For both model alloys, the corrosion kinetics obey the parabolic law. Water-wall tube material 12Cr1MoV appears superiority in corrosion resistance compared with 20G material.

Soot formation and combustion characteristics in confined mesoscale combustors under conventional and oxy-combustion conditions (O2/N2 and O2/CO2)

This work investigated soot formation and combustion characteristics in confined mesoscale combustors of two diameters 4 and 6 mm between conventional and oxy-combustion conditions using high resolution transmissions electron microscopy, thermogravimetric analysis and exhaust gases analysis. Results demonstrated that by increasing O2 concentration, the combustion performance can be improved significantly. In 4 mm combustor, both ethylene conversion and mean wall temperature for N2 diluted flame were larger for higher O2 concentration because the reduction of inert diluted gas decreased the heat loss and more O2 content contributed to reactions of more fuel. For N2 diluted flames in 6 mm combustor, soot nanostructure under 21% O2 exhibited amorphous structures but typical fullerene-like structures with more organized fringes could be observed under 30% and 40% O2. The soot carbonization degree increased notably with higher O2 concentration. For the same O2 concentration and combustor, ethylene conversions and temperatures for CO2 diluted flames were always less than those from N2 diluted flames due the larger specific capacity of CO2 than N2. Higher CO concentrations were also detected in exhaust gas from the flame with CO2 dilution than with N2 because CO2 directly participated in the reaction CO2+H⇄CO+OH.

Second law analysis of premixed and non-premixed oxy-fuel combustion cycles utilizing oxygen separation membranes

Two basic oxy-combustion cycles were investigated under premixed and non-premixed combustion conditions and the results were compared in terms of exergy destruction and first and second law efficiencies. An air separation unit (ASU) was used for oxygen separation from the feeding air in the premixed combustion cycle. In the non-premixed combustion cycle, CO2/H2O splitting membrane reactors were utilized, where oxygen separation and in situ oxy-combustion processes occur within the reactor. A gas turbine cycle, working on conventional air combustion of methane, was selected as the reference base case. Commercial process simulator Aspen Hysys V7.3 was used to model and simulate the different systems. The work proposed novel cycle designs for higher cycle efficiency under oxy-combustion conditions. Cycle performance using ion transport membrane (ITM) and ASU was evaluated and compared. Losses in the ASU and the condenser were identified to be the main reason for lower efficiencies and, hence, the systems were modified to include heat recuperation cycles. Additional two modified oxy-combustion cycle designs were proposed. First law and second law efficiencies of the modified premixed cycle were found to be 34.1% and 47%, compared to 35.1% and 44% for the reference air-combustion cycle. The overall thermal and second law efficiencies of the modified non-premixed cycle were the highest among all cycles with 37.8% and 50.4% efficiencies. The effects of hydrogen addition on the efficiencies of the premixed system were evaluated. It was found that hydrogen addition results in increased first and second law efficiencies of the cycle; however, the increase is only marginal.

Ash aerosol partitioning and ash deposition during the combustion of petroleum coke/natural gas mixtures

This paper is concerned with the formation of ash aerosols and their subsequent deposition on a heat transfer surface during the combustion of petroleum coke. The subject is of interest for two reasons: first, petroleum coke is a good alternate fuel for power plants, and fouling has been identified as a challenging problem, especially under fuel rich conditions; second, this work sheds light on ash aerosol partitioning and subsequent deposition mechanisms as these relate to the fate of organically bound metals in solid fuels in general. In this work, which did not focus on ignition but on ash transformations and deposition, a 100 kW rated down-fired laboratory combustor was employed and natural gas was co-fired with the coke in order to facilitate ignition. Two conditions were considered: 1) air combustion (denoted as Air); 2) oxy combustion with 70% O2 in the inlet oxidant gas (denoted as OXY70). Experimental data presented here consist of particle size distributions (PSD’s), size segregated ash aerosol compositions and information on deposit compositions on a temperature controlled deposit probe. Experimental aerosol size distributions differ between air- and oxy-combustion conditions and are in good agreement with aerosol coagulation theory. The submicron mode in the ash aerosol PSD is proportionately several orders of magnitude greater (on a per kg total ash basis) for petroleum coke than it is for coal. Surprisingly, compositions of the ash deposits are dominated by Fe even though the Fe content in raw petroleum coke ash is low.

Experimental and numerical study of oxy‐methane flames in a porous‐plate reactor mimicking membrane reactor operation

The work investigates the reacting flow field, oxy-methane flame characteristics and location, and the species distributions in a porous-plate reactor mimicking the operation of oxygen transport membrane reactors (OTMRs). The study was performed experimentally and numerically considering ranges of operating equivalence ratio, from 0.5 to 1.0, and CO2 concentrations in the total oxidizer flow (O2 and CO2), from 0% to 55% (by Vol). Oxygen was supplied through a slightly pressurized top and bottom chambers to cross the two porous plates to the central chamber, where a premixed mixture of CH4 and CO2 is introduced. ANSYS Fluent 17.1 software was used to solve for conservation and radiative transfer equations in the full three-dimensional (3-D) domain. The modified Westbrook-Dryer (Oxy-WD) two-step reduced mechanism for oxy-methane combustion was adapted for the calculations of chemical kinetics. The captured flame shapes using a high-speed camera were compared with the calculated ones, and the results showed good agreements. At fixed equivalence ratio, elongated flames were obtained at higher CO2 concentrations due to the increase in the mainstream Reynolds number and reduction in reaction rates, which delays the completeness of combustion. At fixed CO2 concentration, the increase in equivalence ratio resulted in more compact and intense flames. The effective mixing and flame stability resulted in complete fuel conversion under stoichiometric condition. Stable flames were located between the two porous plates at reasonable distance. This perfect flame location prevents the thermal fracture of the membranes and improves their oxygen permeation flux, resulting in better combustion characteristics when the results are projected on the case of OTMRs. This implies efficient and safe applicability of the OTMRs by the condition that membranes can provide sufficient oxygen flux for complete combustion. A warm outer recirculation zone (ORZ) was created beside each porous plate, which helps anchoring the flame at the leading edge of the porous plate. The range of temperature within the ORZ was 800 to 1600 K, which lies in the operability limits of membranes for the case of OTMRs. The effective complete mixing and flame stability resulted in complete fuel conversion under stoichiometric condition. The temperature and species distributions within the reactor are presented in detail over wide ranges of operating conditions. The results recommended the reactor operation under stoichiometric combustion condition based on performance and economic points of views. The results are promising when projected on the application of the OTMRs under oxy-combustion conditions for clean and efficient energy production.

Numerical analysis of turbulence radiation interaction effect on radiative heat transfer in a swirling oxyfuel furnace

With the application of oxyfuel combustion technology, the status of radiative heat transfer in oxyfuel flames is prominent, and accurate description of it is essential. This study simulates the turbulence radiation interaction (TRI) in a swirling gas-fired furnace to understand the thermal radiation behavior under oxycombustion conditions. Employing the non-gray weighted sum of gray gases model calculates the radiative properties of the participating media and the TRI is modeled. The effects of TRI on the radiative heat transfer in the furnace under different oxycombustion conditions and swirl numbers are analyzed. The results show that the effects of thermal radiation on temperature fields are critical in the gas-fired furnace, especially for oxycombustion condition with high oxygen concentration, and the same is true for TRI effect. With the increase of O2 concentration in O2/CO2 oxidizer, the radiative heat flux on the chamber wall, the radiative heat flux contribution to total heat flux, and the net radiative heat loss are increased. Increasing swirl number can weaken the TRI effect. It is observed that with 35% O2 in oxidizer, the radiation contribution to heat flux along the entire wall and local increase of radiative heat flux due to TRI effect are almost than 45% and 18%, respectively.

Partial oxy-combustion technology for energy efficient CO2 capture process

Partial oxy-combustion is considered a promising carbon capture and storage technology that can lead to further energy penalty reductions. The presence of large amounts of CO2 in the flue gas should enhance the driven force in the bulk gas and hence the absorption performance. A novel concept known as Shift to Low Temperature configuration has been developed in order to strengthen the potentialities of partial oxy-combustion. This novel configuration aims at relaxing the operating conditions in the stripper based on the benefits – kinetics and driven force – observed in the absorption unit by means of shifting the operational CO2 cyclic capacity of the solvents towards lower energy requirements for solvent regeneration. In this work, three partial oxy-combustion operating conditions were tested in an experimental bench-scale CO2 capture facility. Results from the test campaign were further compared with both post-combustion and partial oxy-combustion at conventional operating conditions. The energy requirements were further improved as this novel configuration was applied, particularly using 118 °C as stripping temperature in combination with 60%v/v CO2 in the flue gas. Under these operating conditions, the energy penalty was reduced by 11% with respect to conventional partial oxy-combustion operation using the same flue gas composition – from 4.55 to 4.05 GJ/t CO2 using MEA 30 wt% as solvent. The energy penalty was further decreased by up to 64% in comparison with the post-combustion test. The results endorse the use of large CO2 cyclic capacity solvents to enhance the potentialities of the Shift to Low Temperature configuration for carbon capture applications.