Increasing the efficiency of chemical looping combustion of biomass by a dual-stage fuel reactor design to reduce carbon capture costs

Haus, Johannes; Lindmüller, Lennard; Dymala, Timo; Jarolin, Kolja; Feng, Yuanyue; Hartge, Ernst‐Ulrich; Heinrich, Stefan; Werther, Joachim

doi:10.1007/s11027-020-09917-2

Cited by 8 publications

(6 citation statements)

References 14 publications

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“…From the results, it can be assumed that fuels with an average diameter of under 100 μm show even higher gasification rates in the fuel reactor. This was shown with lignite dust in a previous work . Further, the carbon slip might not be problematic in upscaled facilities as a result of higher temperatures, a longer residence time of the char particles in the fuel reactor, and better gas solid contact.…”

Section: Resultssupporting

confidence: 53%

“…This was shown with lignite dust in a previous work. 16 Further, the carbon slip might not be problematic in upscaled facilities as a result of higher temperatures, a longer residence time of the char particles in the fuel reactor, and better gas solid contact.…”

Section: Carbon Slipmentioning

confidence: 99%

“…As a result of the two-stage design, there is no need for an oxygen polishing step or oxygen carriers with CLOU properties. Previous experiments have shown that even with higher fuel rates complete volatile conversions after the second stage were achieved for biomass and lignite. , Because of that, the standpipe of the upper stage was shortened from 60 to 30 cm which decreases the mass of the needed oxygen carrier in the system. We want to show that the problem of volatile conversion can be solved with a two-stage design.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultssupporting

confidence: 53%

Section: Carbon Slipmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2022

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“…3. Detailed descriptions of the used fuels are found in the previous works for softwood [12], hardwood [13], methane [14], bituminous coal [10].…”

Section: Methodsmentioning

confidence: 99%

Experiments on the Dynamic Behavior of the Chemical Looping Combustion Process

Lindmüller

Haus

Heinrich

2022

Chemie Ingenieur Technik

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The dynamic operation of thermal power plants becomes more and more important due to more diverse and volatile power sources. Load changes of biomass, bituminous coal and methane were conducted during six experimental runs in a chemical looping combustion pilot plant which combines power generation and CO2 capture. The resulting step responses of the hydrodynamics and gas concentrations were compared to each other to understand the transient behavior of the interconnected fluidized bed system. The influence of the fuel rate and solid circulation on the response time and intensity was assessed.

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“…An experimental campaign on a 25 kW th CLC system with a two-staged FR, using lignite and biomass (hardwood pellets) as fuels and CuO supported by Al 2 O 3 as OC, was carried out by Haus and co-workers. 109 The FR was divided into two stages 110 (see Figure 7B), FR1 and FR2, by a gas distributor, which was placed between the two beds operated in bubbling mode. The fuel was injected usually into the FR1.…”

Section: ■ Effect Of Volatiles On Bio-clcmentioning

confidence: 99%

Chemical Looping for Combustion of Solid Biomass: A Review

Coppola¹,

Scala

2021

Energy Fuels

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Chemical looping combustion of solid biomass has the unique potential to generate energy with negative carbon emissions, while entailing an energy penalty compared to traditional combustion that is lower than that of the competing carbon capture technologies. In spite of these attractive features, research is still needed to bring the technology to a fully commercial level. The reason relies on a number of technological challenges mostly related to the oxygen carrier performance, its possible detrimental interaction with the biomass ash components, and the efficiency of the gas–solid contact with the biomass volatiles. This review is focused on these specific challenges which are particularly relevant when firing biomass rather than coal in a solid-based chemical looping combustion process. Special attention will be given to the most recent findings published on these aspects. Related performance evaluation by modeling, system integration, and techno-economic analysis will also be briefly reviewed.

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Increasing the efficiency of chemical looping combustion of biomass by a dual-stage fuel reactor design to reduce carbon capture costs

Cited by 8 publications

References 14 publications

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

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

Experiments on the Dynamic Behavior of the Chemical Looping Combustion Process

Chemical Looping for Combustion of Solid Biomass: A Review

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