The use of petroleum coke as fuel in chemical-looping combustion

Leion, Henrik; Mattisson, Tobias; Lyngfelt, Anders

doi:10.1016/j.fuel.2006.11.037

Cited by 273 publications

(295 citation statements)

References 20 publications

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“…The H 2 and CO removal from the gasification products reduced the inhibition effect that both gases, especially H 2 , could have on the gasification process [51]. Similar conclusions were reached before in previous studies using Fe-based oxygen carriers [21,38,52]. The decrease in the inhibition of char gasification can be observed in Figure 5 (B), where the char conversion evolution with time is represented for both sand and bauxite waste experiments.…”

Section: Char Gasification In the Presence Of Bauxite Wastesupporting

confidence: 85%

“…The time to convert 95% of the char present in the bed, (t 95 ), was determined, as an estimation of the residence time to mostly convert the char in the reactor [21,27,38]. In order to calculate this value it was assumed that the gasification reaction can be represented using the homogeneous model:…”

Section: Data Evaluationmentioning

confidence: 99%

“…Leion et al [27] observed that the coal gasification reaction was slow when compared to the reaction of the oxygen-carrier with the gasification products (CO and H 2 ). Actually, other batch fluidized-bed studies with coal also pointed to a high reactivity of different Fe-based oxygen-carriers to H 2 and CO generated in coal gasification [21,[37][38]. Therefore, the gasification of the fuel can be considered as the limiting step of the process [21,27].…”

Section: Introductionmentioning

confidence: 99%

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Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

Mendiara

Gayán

Abad

et al. 2013

Fuel Processing Technology

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In the recently developed Chemical-Looping Combustion (CLC) technology, the oxygen needed for the oxidation of the fuel is provided by an oxygen-carrier. Today, there is an increasing interest on CLC application to solid fuels, especially coal. One of the possibilities to process coal in a CLC system is the in situ gasification and subsequent combustion of the product gases (iG-CLC). Potential CLC oxygen-carriers should comply with some chemical and mechanical requirements but it would be interesting that the carrier is as inexpensive as possible, as some losses are expected accompanying the coal ashes. In the present work, a residue from alumina production mainly constituted by Fe 2 O 3 has been tested as oxygencarrier in CLC of coal. Batch experiments were carried out in a fluidized-bed reactor using a bituminous coal as fuel. The effect of operating conditions, such as temperature and gasification agent on the char conversion and combustion efficiency of gasification products were evaluated. Several H 2 O/CO 2 mixtures were tested as gasifying agents. After 50 hours of cycling operation in a batch fluidized bed, no defluidization or agglomeration problems were observed. A gain in the reactivity of the bauxite waste was observed with the number of redox cycles. The carrier showed high combustion efficiencies at all temperatures tested meaning that the bauxite waste was capable of burning the gases generated during the gasification of the char. The percentage of CO 2 in the feeding should be limited in order to maintain high gasification rates and combustion efficiencies. The present results indicate that this bauxite waste is a promising oxygen-carrier for the iG-CLC of coal.

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Section: Char Gasification In the Presence Of Bauxite Wastesupporting

confidence: 85%

Section: Data Evaluationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

Mendiara

Gayán

Abad

et al. 2013

Fuel Processing Technology

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“…In the literature it was found that the temperature in the fuel reactor is one of the parameters with most influence on coal conversion [10,12,16] because of its effect on the gasification rate. Indeed, the gasification step has high influence on the performance of this process [24][25][26][27]. In this work an evaluation of the iG-CLC process performance with different coals was made for increasing fuel reactor temperature.…”

Section: Resultsmentioning

confidence: 99%

“…The gasification process has been identified as the controlling step in this process [24][25][26][27].…”

Section: Solid Fuelmentioning

confidence: 99%

Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

Cuadrat

Abad

Gayán

et al. 2012

Chemical Engineering Journal

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In this work the CLC process for solid fuels using ilmenite as oxygen carrier was evaluated in a continuous CLC unit. In this process, gasification of solid fuel happens in the fuel reactor which is fluidized by a gasifying agent, i.e, H 2 O. This process has been referred as in-situ Gasification CLC, iG-CLC. The feasibility of using fuels ranging from lignite to anthracite and the effect of the coal rank on the process performance was evaluated. The carbon capture efficiency followed the trend of the coal rank, as it was higher for lignite, then for the bituminous coals and it was lower for anthracite. Special attention was put on the combustion of the volatile matter of the different fuels. In all cases oxygen demands lower than 10% were found; for anthracite the oxygen demand values were 3.5% because of the lower volatile content of this fuel. A temperature increase was proven to be advantageous to reach high carbon capture and combustion efficiencies for all the fuels tested. Also, the feasibility of using H 2 O:CO 2 mixtures as gasification agent with each type of fuel was also assessed and it was seen that in case of bituminous coals and lignite some of H 2 O can be replaced by CO 2 .

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Introduction

Fan

2010

Chemical Looping Systems for Fossil Energy Conversions

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The use of petroleum coke as fuel in chemical-looping combustion

Cited by 273 publications

References 20 publications

Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

Performance of a bauxite waste as oxygen-carrier for chemical-looping combustion using coal as fuel

Relevance of the coal rank on the performance of the in situ gasification chemical-looping combustion

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