Performance of an iron based oxygen carrier in a 120 kWth chemical looping combustion pilot plant

Relevance of oxygen carrier properties on the design of a chemical looping combustion unit with gaseous fuels

“…For the Fe20γ Al material, methane conversion values in the DCFB-CLC at TUV were widespread in the 40-60% interval with no clear tendency when the oxygen carrier to fuel ratio or the solids inventory in the fuel reactor were varied. 10,15 However, no detailed information about operating conditions are available. The fuel and air reactor models were used in a coupled way to predict the methane conversion for the following operational condition: Power = 120 kW; T = 950°C, P FR = P AR = 7 kPa, φ = 1.9 and λ = 1.2.…”

“…These materials have also been tested in the 120 kW th CLC unit at Vienna University of Technology (TUV). 9,10 This unit is a dual circulating fluidized bed (DCFB) system, which consists of two hydraulically connected circulating fluidized bed reactors. Complete combustion was not reached in any case.…”

“…9 Lower CH 4 conversion values, in the range 40-60%, were achieved using the iron material. 10 These results were unexpected because of the better gas-solid contact in a circulating fluidized bed compared to the bubbling fluidized bed. 11 However, almost complete combustion of CH 4 was achieved in a 150 kW th CLC unit at SINTEF with the impregnated Cu-based material.…”

Study on Preparation of Oxygen Carrier Using Copper Slag as Precursor

“…There have been significant advances in metal oxide OC such as Fe, Ni, Cu, and Mn for chemical looping applications (Kang et al, 2010;Gu et al, 2015;Jiang et al, 2017). Among these materials, Fe-based OC has attracted increasing attention because of its high oxygen release capacity (Cheng et al, 2018), cost benefits (He et al, 2013;Mayer et al, 2018) as well as environmental compatibility (Luo et al, 2014;Chen et al, 2021). In addition, due to their sulfur tolerance, Fe-based oxygen carriers can react with acid gases or even solid sulfur fuels without affecting its reactivity and phase (Garcia-Labiano et al, 2014;Garcia-Labiano et al, 2016).…”

Bauxite waste with low Fe 2 O 3 and high Na concentration as a promising oxygen carrier in chemical looping combustion

“…Hence, commercial applications of CLC is heavily dependent on the availability of high‐performance and cost‐effective OCs. Properties necessary for an effective OC include the following: high oxygen transport capacity, which reduces the demand of bed materials circulating in the CLC unit and, as a result, lowers the unit size and running cost; high redox reactivity, as the OC is supposed to convert fuel and then be re‐oxidized by air alternatively in a short time; durable cyclic stability, as the OC is supposed to be agglomeration resistance and maintain its performance during the circulation as long as possible; high mechanical strength, which is helpful to mitigate the adverse effects of attrition and crushing of the OC particles during the operation; low cost, since the possible commercial applications of CLC have been taken seriously the primary concern is to develop cost‐effective OCs; and environment‐friendly, the OC must be non‐toxic to eliminate the potential hazards for ecological environment as much as possible. Iron‐based OCs have distinguished themselves from the other candidates (eg, Ni, Mn, Cu, and Co based OCs) and been considered as the most competitive OCs as they best meet the above evaluation criteria .…”