Analysis of a Two‐Stage Fuel Reactor System for the Chemical‐Looping Combustion of Lignite and Bituminous Coal

Haus, Johannes; Lyu, Kai; Hartge, Ernst‐Ulrich; Heinrich, Stefan; Werther, Joachim

doi:10.1002/ente.201600102

Cited by 25 publications

(17 citation statements)

References 33 publications

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“…The last operations reported in this unit used an oxygen carrier based on CuO supported on -Al 2 O 3 in the temperature range 800-900 ºC to burn two types of coal, i.e. lignite and bituminous coal [149]. These conditions allow work in iG-CLC mode, but with some gaseous oxygen release at the highest temperature.…”

Section: Hamburg University Of Technology (Tuhh Germany)mentioning

confidence: 99%

“…[43]. [115,124,136,137,145,146,148,159,200]; Fe 2 O 3 -based [39,101,127,129,132,140,201]; NiO-based [38,126,202]; CuO-based [149]; CaSO 4 [163]. Fig 28A.csv, Fig 28B.csv).…”

Section: Highlights On the Future Research Of Clc With Solid Fuelsmentioning

confidence: 99%

“…-No unburnt products in FR FR If Ω0  -Oxygen needed in oxygen polishing step with respect to the required to burn the solid fuel converted in the fuel reactor -Depends on elutriation and on carbon capture efficiency [38,126,202]; CuO-based [149]; CaSO 4 [163]. Interactive plots available in the web version of the paper.…”

Section: Ar Frmentioning

confidence: 99%

“…Therefore, the research group is currently working on a new design of the fuel reactor to allow coal feed into both stages [149].…”

mentioning

confidence: 99%

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Chemical looping combustion of solid fuels

Adánez

Abad

Mendiara

et al. 2018

Progress in Energy and Combustion Science

487

321

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Chemical Looping Combustion (CLC) has arisen during last years as a very promising combustion technology for power plants and industrial applications, with inherent CO 2 capture which avoids the energy penalty imposed on other competing technologies. The use of solid fuels in CLC has been highly developed in the last decade and currently stands at a technical readiness level (TRL) of 6. In this paper, experience gained during CLC operation in continuous units is reviewed and appraised, focusing mainly on technical and environmental issues relating to the use of solid fuels. Up to now, more than 2700 hours of operational experience has been reported in 19 pilot plants ranging from 0.5 kW th to 4 MW th. When designing a CLC unit, the preferred configuration for the scale-up of CLC of solid fuels is a two circulating fluidized beds (CFB) system. Coal has been the most commonly used solid fuel in CLC, but biomass has recently emerged as a very promising option to achieve negative emissions using bioenergy with carbon capture and storage (BECCS). Mostly low cost iron and manganese materials have been used as oxygen carriers in the so called in-situ gasification CLC (iG-CLC). The development of Chemical Looping with oxygen uncoupling (CLOU) makes a qualitative step forward in the solid fuel combustion, due to the use of materials able to release oxygen. The performance and environmental issues of CLC of solid fuels is evaluated here. Regarding environmental aspects, the pollutant emissions (SO 2 , NO x , etc.) released into the atmosphere from the air reactor are no cause of concern for the environment. However, the presence of SO 2 , NO x and Hg at the exit of the fuel reactor affects CO 2 quality, which must be taken into account during the later compression and purification stages. The effect of the main variables affecting CLC performance is evaluated for fuel conversion, CO 2 capture rate, and combustion efficiency obtained in different CLC 3 units. Solid fuel conversion is normally not complete during operation, due to the undesired loss of char. A methodology is presented to extrapolate the current information to what could be expected in a larger CLC system. CO 2 capture near 100% has been reported using a highly efficient carbon stripper, highly reactive fuels (such as lignites and biomass, etc.) or by the CLOU process. Operational experience in iG-CLC has showed that it is not possible to reach complete fuel combustion, making an additional oxygen polishing step necessary. For the further scale-up, it is essential to reduce the unburnt compounds at the fuel reactor outlet. Proposals to achieve this reduction already exist and include both improvement to the gas-oxygen carrier contact, or new design concepts based on the current scheme for iG-CLC. In addition, CLOU based on copper materials has shown that complete fuel combustion could be achieved. Main challenges for the future development and scale-up of CLC technology have been also identified. A breakthrough in the future development of CLC technology for ...

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Section: Hamburg University Of Technology (Tuhh Germany)mentioning

confidence: 99%

“…[43]. [115,124,136,137,145,146,148,159,200]; Fe 2 O 3 -based [39,101,127,129,132,140,201]; NiO-based [38,126,202]; CuO-based [149]; CaSO 4 [163]. Fig 28A.csv, Fig 28B.csv).…”

Section: Highlights On the Future Research Of Clc With Solid Fuelsmentioning

confidence: 99%

Section: Ar Frmentioning

confidence: 99%

“…Therefore, the research group is currently working on a new design of the fuel reactor to allow coal feed into both stages [149].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Chemical looping combustion of solid fuels

Adánez

Abad

Mendiara

et al. 2018

Progress in Energy and Combustion Science

487

321

View full text Add to dashboard Cite

show abstract

“…[1] Choosing the right oxygen carrier and better operating conditions are some of the key issues in the chemical-looping gasification process. [2][3][4][5][6] Guo et al suggested that multifunctional oxygen carrier compounds, such as Ca-based oxygen carriers with K or Na pendant groups, coupled with catalytic gasification, could effectively accelerate coal gasification, but the systems suffered alkali metal loss during the recycling process. [7,8] Moreover, Cu-based oxygen carriers usually exhibit greater oxygen donating capacity and much higher reactivity, which can effectively accelerate char gasification.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Chemical-looping Gasification Characteristics of Chinese Western Coals with Hematite-CuO Oxygen Carrier

Yuan

Sun³

et al. 2020

E3S Web Conf.

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In order to realize highly efficient conversion of Chinese western bituminous coals into syngas, a series of chemical-looping gasification experiments was conducted with hematite-CuO oxygen carrier in a laboratory-scale fluidized-bed reactor. The results indicated that the gasification rate of Chinese western bituminous increased by 2-3 times after addition of a hematite-CuO oxygen carrier. Meanwhile, the syngas yields of Chinese western bituminous ranged from 1.84–2.04 m3/kg, three times higher than that of lignite. This shows that the combination of chemical-looping technology and gasification of coal can achieve efficient conversion of Chinese/western bituminous coals. The temperature and the supply oxygen coefficient (O/C) all demonstrated a clear effect on the gasification rates and the gas yields. 10 cycles of redox experiments indicated that the hematite-CuO oxygen carriers have good recycled reaction characteristics. Those results provide theoretical guidance for the efficient conversion of Chinese western bituminous coals into syngas via chemical-looping gasification.

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Modeling Study on Non‐Uniform Lateral Distribution in Large‐Scale Circulating Fluidized Bed Boilers

Deng

Zhang

et al. 2022

Chemie Ingenieur Technik

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Ing. Joachim Werther on the occasion of his 80th birthdayWith the development of the circulating fluidized bed (CFB) combustion technology, the cross-sectional area of the boiler furnace increases gradually, making the lateral non-uniform distribution in the furnace more prominent. To investigate the flow field inhomogeneity in the furnace, a two-dimensional mass balance model was established in this work, and the lateral solid concentration deviation was adopted to evaluate the degree of the flow field inhomogeneity. Afterwards, the effect of four factors on the lateral non-uniform distribution was examined. It turned out that the lateral profile of the primary air flow rate had a much greater influence than that of the coal feeding rate.

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Analysis of a Two‐Stage Fuel Reactor System for the Chemical‐Looping Combustion of Lignite and Bituminous Coal

Cited by 25 publications

References 33 publications

Chemical looping combustion of solid fuels

Chemical looping combustion of solid fuels

Investigation of Chemical-looping Gasification Characteristics of Chinese Western Coals with Hematite-CuO Oxygen Carrier

Modeling Study on Non‐Uniform Lateral Distribution in Large‐Scale Circulating Fluidized Bed Boilers

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