Chemical-looping combustion using combined iron/manganese/silicon oxygen carriers

Källén, Malin; Rydén, Magnus; Lyngfelt, Anders; Mattisson, Tobias

doi:10.1016/j.apenergy.2015.03.136

Cited by 29 publications

(5 citation statements)

References 32 publications

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“…It shall be noted that combined Fe-Mn-Si oxides are among the more interesting combined oxide systems for oxygen-carrying purposes (Rydén et al 2014a;Källén et al 2015). LD slag has previously been examined as oxygen carriers in experiments involving combustion (Wang et al 2017) and tar reforming (Keller et al 2014).…”

Section: Oxygen Carrier Materialsmentioning

confidence: 99%

Avoiding CO2 capture effort and cost for negative CO2 emissions using industrial waste in chemical-looping combustion/gasification of biomass

Moldenhauer

Linderholm

Rydén

et al. 2019

Mitig Adapt Strateg Glob Change

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Chemical-looping combustion (CLC) is a combustion process with inherent separation of carbon dioxide (CO 2), which is achieved by oxidizing the fuel with a solid oxygen carrier rather than with air. As fuel and combustion air are never mixed, no gas separation is necessary and, consequently, there is no direct cost or energy penalty for the separation of gases. The most common form of design of chemical-looping combustion systems uses circulating fluidized beds, which is an established and widely spread technology. Experiments were conducted in two different laboratory-scale CLC reactors with continuous fuel feeding and nominal fuel inputs of 300 W th and 10 kW th , respectively. As an oxygen carrier material, ground steel converter slag from the Linz-Donawitz process was used. This material is the second largest flow in an integrated steel mill and it is available in huge quantities, for which there is currently limited demand. Steel converter slag consists mainly of oxides of calcium (Ca), magnesium (Mg), iron (Fe), silicon (Si), and manganese (Mn). In the 300 W unit, chemical-looping combustion experiments were conducted with model fuels syngas (50 vol% hydrogen (H 2) in carbon monoxide (CO)) and methane (CH 4) at varied reactor temperature, fuel input, and oxygen-carrier circulation. Further, the ability of the oxygen-carrier material to release oxygen to the gas phase was investigated. In the 10 kW unit, the fuels used for combustion tests were steam-exploded pellets and wood char. The purpose of these experiments was to study more realistic biomass fuels and to assess the lifetime of the slag when employed as oxygen carrier. In addition, chemical-looping gasification was investigated in the 10 kW unit using both steam-exploded pellets and regular wood pellets as fuels. In the 300 W unit, up to 99.9% of syngas conversion was achieved at 280 kg/MW th and 900°C, while the highest conversion achieved with methane was 60% at 280 kg/MW th and 950°C. The material's ability to release oxygen to the gas phase, i.e., CLOU property, was developed during the initial hours with fuel operation and the activated material released 1-2 vol% of O 2

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Section: Oxygen Carrier Materialsmentioning

confidence: 99%

Avoiding CO2 capture effort and cost for negative CO2 emissions using industrial waste in chemical-looping combustion/gasification of biomass

Moldenhauer

Linderholm

Rydén

et al. 2019

Mitig Adapt Strateg Glob Change

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“…Guideline values are 22 wt% Fe 2 O 3 , 3 wt% MnO, 10 wt% SiO 2 , 43 wt% CaO, 9 wt% MgO with oxides of aluminium, titanium and vanadium being the main impurities. It should be noted that combined Fe-Mn-Si oxides are among the more interesting combined oxide systems for oxygen carrying purposes [17,19].…”

Section: Ld-slag As Oxygen Carriermentioning

confidence: 99%

“…By mixing LD-slag with a certain percentage of silica sand, it should be possible to utilize the well-documented ability of silica sand to bind ash components, while potentially still achieving benefits from the oxygen carrying properties of LD-slag. Mixing of oxygen carrier and silica sand in A detailed analysis of bed and ash samples from the campaign described in this paper is provided elsewhere [23], where it is shown that the concentration of potassium and sulphur in fly ash samples increased greatly when ammonium sulphate was added to the vortex finder (K by a factor of 5-6 and S by a factor of [12][13][14][15][16][17][18][19]. The increase in potassium should be due to formation of K 2 SO 4 .…”

Section: Mixing Of Ld-slag With Sandmentioning

confidence: 99%

Oxygen Carrier Aided Combustion (OCAC) of Wood Chips in a 12 MWth Circulating Fluidized Bed Boiler Using Steel Converter Slag as Bed Material

2018

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The novel combustion concept Oxygen Carrier Aided Combustion (OCAC) is realized by addition of an active oxygen-carrying bed material to conventional fluidized bed boilers. The active bed material is meant to become reduced in fuel-rich parts of the boiler and oxidized in oxygen-rich parts, thus potentially providing advantages such as new mechanisms for oxygen transport in space and time. In this study, oxygen-carrier particles prepared from so called Linz-Donawitz (LD)-slag are examined as active bed material in a 12 MWth Circulating Fluidized Bed (CFB) boiler. LD-slag is the second largest by-product in steel making and is generated in the basic LD oxygen converter process. The experimental campaign lasted for two full weeks. The fuel was wood chips. LD-slag worked well from an operational point of view and no problems related to handling, agglomeration or sintering were experienced, albeit the production of fly ash increased. The boiler temperature profile suggested that fuel conversion in the main boiler body was facilitated, but the effect did not readily translate into reduced emissions from the stack. Spraying an aqueous solution of ammonium sulphate directly into the cyclone outlet with the aim of rejecting alkali metals as alkali suphates was found to solve the problems related to carbon monoxide emissions, suggesting that the problems could be due to the poor ability of LD-slag to absorb certain ash components. Use of a mixed bed consisting of 10–50 wt% LD-slag, with the remaining part being silica sand for ash absorption, also worked well. It is concluded that LD-slag could be a very cheap and readily available oxygen-carrying bed material for use in fluidized bed applications.

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“…An iron ore modified with cement/CaO was used in combustion of coal in a 1 kW unit in Nanjing, [5], Vienna University of Technology presented results from operation under varying conditions with four different oxygen carriers in a 120 kW th using natural gas, [6] Two calcium manganite materials were able to fully convert the fuel. Finally, operation of a small 300 W chemical-looping with novel oxygen carrier materials of combined manganese/iron/silicon oxides has been presented, [7].…”

Section: Pilot Operation Of Chemical Looping Combustion Of Solid and mentioning

confidence: 99%

The 3rd International Conference on Chemical Looping 2014

et al. 2015

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Chemical-looping combustion using combined iron/manganese/silicon oxygen carriers

Cited by 29 publications

References 32 publications

Avoiding CO2 capture effort and cost for negative CO2 emissions using industrial waste in chemical-looping combustion/gasification of biomass

Avoiding CO2 capture effort and cost for negative CO2 emissions using industrial waste in chemical-looping combustion/gasification of biomass

Oxygen Carrier Aided Combustion (OCAC) of Wood Chips in a 12 MWth Circulating Fluidized Bed Boiler Using Steel Converter Slag as Bed Material

The 3rd International Conference on Chemical Looping 2014

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