A 30-kWth moving-bed chemical looping system for hydrogen production

Chen, Cetera; Chen, Chien‐Hua; Chang, Ming Chau; Lee, Hsiu-Hsia; Chang, Yu‐Cheng; Wen, Tzeng-Wen; Shen, Cheng-Hsien; Wan, Hou‐Peng

doi:10.1016/j.ijggc.2019.102954

Cited by 13 publications

(7 citation statements)

References 19 publications

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“…The oxygen carrier conversion rate of 9.6% indicated that almost all iron oxide was in the Fe 3 O 4 state, with less in the FeO and Fe states. As FeO was cooled down from the reaction temperature to room temperature, it decomposed into Fe and Fe 3 O 4 . Therefore, Fe was detected in the sample of test 1.…”

Section: Resultsmentioning

confidence: 99%

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Reaction Properties of Basic Oxygen Furnace Slag and Methane in a Fluidized-Bed Chemical Looping System

Chen,

Wu,

Kao

2023

ACS Omega

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In the conventional steelmaking process, slag is the second-largest byproduct. Although most slags have ways to be reused, the demand for small BOF (basic oxygen furnace) slag is still limited. This study aimed to develop a fluidized-bed chemical looping system using BOF slag as an oxygen carrier and methane as a fuel to produce heat for the steelmaking process. The results of the BOF slag reaction test on a batch fluidization and reaction test facility indicated that the methane conversion rate increased with an increase in the methane concentrations and the reaction temperature. As methane concentration increased from 5 to 15 v/v % at the reaction temperature of 950 °C and the fluidized velocity of 5.1 times the minimum fluidized velocity of BOF slag, the methane conversion rate increased from 65.8 to 76.6%. By setting 10 v/v % as the referenced methane concentration, the methane conversion rate corresponded to 71.6%, and as the reaction temperature increased to 980 °C, the methane conversion rate of 85.7% was achieved. The fluidized gas velocity influenced the fluidized state of the oxygen carrier and the gas residence time in the reactor. As the gas velocity was 1.9 times the minimum fluidization velocity of BOF, the methane and oxygen carrier conversion rates reached 83.3 and 13.0% at the referenced methane concentration and reaction temperature of 950 °C. The experimental results could offer the required design and operation parameters for the methane fluidized bed chemical looping system using BOF slag as the oxygen carrier.

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Section: Resultsmentioning

confidence: 99%

“…As FeO was cooled down from the reaction temperature to room temperature, it decomposed into Fe and Fe 3 O 4 . 29 Therefore, Fe was detected in the sample of test 1. Test 3 was performed with a 15% methane concentration, and it exhibited a higher methane conversion rate compared with that in test 1.…”

Section: Effect Of Methane Concentrationmentioning

confidence: 99%

Reaction Properties of Basic Oxygen Furnace Slag and Methane in a Fluidized-Bed Chemical Looping System

Chen,

Wu,

Kao

2023

ACS Omega

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“…(2) The FR is a turbulent fluidized bed (TFB); a carbon stripper (CS) is located on the top of FR; and a riser is used to connect the FR and CS. (3) The solid circulation rate is primarily controlled by the lifter gas velocity. (4) OCs from the AR first enter the FR riser and react with the unconverted gas from the TFB to improve the syngas conversion efficiency.…”

Section: Methodsmentioning

confidence: 99%

“…1,2 To achieve this target, the global greenhouse gas emissions in 2050 should be reduced to 40−70% of the emission level of the 2010s. 3 It is of great social significance and economic benefit to develop efficient CO 2 separation technology to achieve the target of CO 2 emission reduction. Therefore, some CO 2 capture technologies including pre-combustion capture, post-combustion capture, oxy-fuel combustion, and chemical looping combustion (CLC) were demonstrated.…”

Section: Introductionmentioning

confidence: 99%

“…According to the Paris Agreement, the global temperature rise should be below 2 °C in 2100. , To achieve this target, the global greenhouse gas emissions in 2050 should be reduced to 40–70% of the emission level of the 2010s . It is of great social significance and economic benefit to develop efficient CO 2 separation technology to achieve the target of CO 2 emission reduction.…”

Section: Introductionmentioning

confidence: 99%

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Controlling the Solid Circulation Rate and Residence Time in Whole Loops of a 1.5 MW_th Chemical Looping Combustion Cold Model

et al. 2022

Energy Fuels

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Autothermal operation is a big challenge for a chemical looping combustion (CLC) demonstration plant. One of the key points of CLC autothermal operation is to achieve a high solid circulation rate and enough solid residence time. To address this challenge, a dedicated lifter is proposed to control the solid circulation rate and residence time in the dual fluidized bed reactor system. This dedicated lifter is integrated into a 1.5 MWth CLC cold flow model to evaluate the control of the solid circulation rate and residence time of this new CLC scheme. Continuous and stable circulation of solid particle operation is achieved in the cold flow model, and it has been demonstrated that the dedicated lifter can effectively control the solid circulation rate. The effect of gas velocity, bed inventory, and particle size on the fluidization in the whole loops is studied. The dedicated lifter can control the solid circulation rate in the range of 20–68 kg m–2 s–1, and residence time in the fuel reactor is maintained in the range of 180–610 s. The solid circulation rate and residence time obtained in this work satisfy the theoretical requirements of CLC autothermal and char gasification, respectively, which indicates that the autothermal operation of the CLC unit as well as high carbon capture efficiency can be realized in this new CLC scheme.

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Storing solar energy in continuously moving redox particles – Experimental analysis of charging and discharging reactors

et al. 2022

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A 30-kWth moving-bed chemical looping system for hydrogen production

Cited by 13 publications

References 19 publications

Reaction Properties of Basic Oxygen Furnace Slag and Methane in a Fluidized-Bed Chemical Looping System

Reaction Properties of Basic Oxygen Furnace Slag and Methane in a Fluidized-Bed Chemical Looping System

Controlling the Solid Circulation Rate and Residence Time in Whole Loops of a 1.5 MW_th Chemical Looping Combustion Cold Model

Storing solar energy in continuously moving redox particles – Experimental analysis of charging and discharging reactors

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A 30-kWth moving-bed chemical looping system for hydrogen production

Cited by 13 publications

References 19 publications

Reaction Properties of Basic Oxygen Furnace Slag and Methane in a Fluidized-Bed Chemical Looping System

Reaction Properties of Basic Oxygen Furnace Slag and Methane in a Fluidized-Bed Chemical Looping System

Controlling the Solid Circulation Rate and Residence Time in Whole Loops of a 1.5 MWth Chemical Looping Combustion Cold Model

Storing solar energy in continuously moving redox particles – Experimental analysis of charging and discharging reactors

Contact Info

Product

Resources

About

Controlling the Solid Circulation Rate and Residence Time in Whole Loops of a 1.5 MW_th Chemical Looping Combustion Cold Model