Minimizing gas leakages in a system of coupled fluidized bed reactors for chemical looping combustion

Lindmüller, Lennard; Haus, Johannes; Nair, Arun Ramesh Kumar; Heinrich, Stefan

doi:10.1016/j.ces.2021.117366

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…The authors indicate the bed agglomeration, oxygen carrier deactivation, fouling, and corrosion as the most harmful effects associated with biomass alkali release. The problem of gas leakages between fluidized bed reactors via a loop seal was investigated by Lindmuller et al [80] on a 25 kWth CLC facility. Loop seal design ideas and operation condition proposals are suggested in this work.…”

Section: Dual Fluidized-bed Reactormentioning

confidence: 99%

Chemical Looping Combustion: A Brief Overview

et al. 2022

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The current development of chemical looping combustion (CLC) technology is presented in this paper. This technique of energy conversion enables burning of hydrocarbon fuels with dramatically reduced CO2 emission into the atmosphere, since the inherent separation of carbon dioxide takes place directly in a combustion unit. In the beginning, the general idea of the CLC process is described, which takes advantage of solids (so-called oxygen carriers) being able to transport oxygen between combustion air and burning fuel. The main groups of oxygen carriers (OC) are characterized and compared, which are Fe-, Mn-, Cu-, Ni-, and Co-based materials. Moreover, different constructions of reactors tailored to perform the CLC process are described, including fluidized-bed reactors, swing reactors, and rotary reactors. The whole systems are based on the chemical looping concept, such as syngas CLC (SG-CLC), in situ Gasification CLC (iG-CLC), chemical looping with oxygen uncoupling (CLOU), and chemical looping reforming (CLR), are discussed as well. Finally, a comparison with other pro-CCS (carbon capture and storage) technologies is provided.

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Section: Dual Fluidized-bed Reactormentioning

confidence: 99%

Chemical Looping Combustion: A Brief Overview

et al. 2022

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“…With the implementation of these measures, the leakage flow could be decreased up to 0.3 vol % of the air reactor volumetric flow. A detailed analysis of the pressure situation and minimization of gas leakages is described in a previous publication …”

Section: Experimental Overviewmentioning

confidence: 99%

“…A detailed analysis of the pressure situation and minimization of gas leakages is described in a previous publication. 22 Table 6 summarizes the 25 operation points and includes the CO 2 capture (η CC ), combustion efficiency in the fuel reactor (η comb,FR ), and oxygen demand after either one (Ω T,FR1 ) or both (Ω T,FR2 ) fuel reactor stages. Each horizontal line indicates a new experimental run.…”

Section: Experimental Overviewmentioning

confidence: 99%

High Volatile Conversion in a Chemical Looping Combustion System with Three Different Biomasses

2022

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Chemical looping combustion (CLC) is a combustion process with CO2 sequestration without direct contact between air and fuel. The produced pure CO2 stream can be recycled for further usage in carbon capture and utilization or carbon capture and storage. In this work, the performance of a 25 kWth CLC facility is investigated by firing three types of ground wood pellets with CuO/Al2O3 as the oxygen carrier. The unit consists of two fluidized beds, an air reactor, a two-stage fuel reactor, two loop seals, and a cyclone. As a result of the high volatile content of the biomass, fuel gases often bypass the oxygen carrier and leave the system unconverted. Therefore, the volatile conversion of the two-stage fuel reactor is investigated, especially after the shortening of the overflow pipe in the upper stage. The fuel was introduced in the lower stage, where it is only partly converted. The remaining combustible gases flow into the upper stage, where they are further converted. This way combustion efficiencies of up to 98% could be achieved. It shows that shortening the upper stage in the fuel reactor has no negative impact on the performance. Oxygen demands of <1% could be reached under stable operating conditions, with CO2 capture efficiencies of up to 98%. The carbon slip to the air reactor was examined for different biomass particle sizes and types. Lower carbon slips were achieved with smaller particles.

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“…For the drying and devolatilization of the biomass, the Volatile Manager of BARRACUDA VR ® 21.0 is used which, is based on a single step first-order Arrhenius equation, as commonly applied in the literature [1,45,46]. The mechanism is given in Equation (10), where T represents the temperature, m i the mass, A i the pre-exponential factor, and E i the activation energy of the release of volatiles and the moisture, respectively.…”

Section: Pyrolysismentioning

confidence: 99%

“…A similar carbon capture technology, namely the chemical looping combustion (CLC), can be applied to combust fuels such as biomass or coal to generate power. A product gas mainly composed of CO 2 and steam is obtained [9,10] in contrast to BCLG, where the produced syngas can be used for a wide range of applications. A schematic representation of the chemical looping gasification (CLG) principle is shown in Figure 1 and a detailed description of the CLG process is given in the work of Ge et al [11].…”

Section: Introductionmentioning

confidence: 99%

MP-PIC Simulation of Biomass Steam Gasification Using Ilmenite as an Oxygen Carrier

et al. 2022

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Biomass chemical looping gasification (BCLG) is a complex process for the conversion of biomass using an oxygen carrier, which is influenced by various operating parameters. For a better understanding of this process, biomass steam gasification using ilmenite as an oxygen carrier is numerically investigated in this work using the multiphase particle-in-cell (MP-PIC) method, which is a modified Euler–Lagrange approach. As a first step, a reduced reaction network for biomass gasification is investigated in a spouted bed. As a second step, the reaction network is coupled with oxygen carrier kinetics of ilmenite for the simulation of BCLG in a lab-scale fluidized bed. For both steps, the influence of the main operating parameters, such as reactor temperature, steam-to-biomass ratio, and oxidation degree of the oxygen carrier, are investigated and compared with experimental data from the literature. In general, the simulations show satisfying results and the predicted syngas compositions with varied operating parameters are in good agreement with the experimental data. Furthermore, the main trends for the syngas composition are predicted correctly and the oxidation degree of the oxygen carrier has a significant influence on the resulting syngas composition confirming the experimental results.

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Minimizing gas leakages in a system of coupled fluidized bed reactors for chemical looping combustion

Cited by 11 publications

References 12 publications

Chemical Looping Combustion: A Brief Overview

Chemical Looping Combustion: A Brief Overview

High Volatile Conversion in a Chemical Looping Combustion System with Three Different Biomasses

MP-PIC Simulation of Biomass Steam Gasification Using Ilmenite as an Oxygen Carrier

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