Hydrodynamic viability of chemical looping processes by means of cold flow model investigation

Bischi, Aldo; Langørgen, Øyvind; Morin, Jean-Xavier; Bakken, Jørn; Ghorbaniyan, Masoud; Bysveen, Marie; Bolland, Olav

doi:10.1016/j.apenergy.2011.12.051

Cited by 33 publications

(21 citation statements)

References 28 publications

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“…According to this way, the composition of the flue gases is CO 2 and H 2 O, so the CO2 can be separated only by cooling the steam and no energy is needed for CO 2 separation. In recent years, several researchers have investigated and contributed to the development of the CLC technology [7][8][9]. Mattisson and Lyngfelt [10] designed and proposed a 10 kW fluidized-bed CLC boiler.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of chemical-looping hydrogen generation

Zhang

Jin

2013

Applied Energy

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Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of chemical-looping hydrogen generation

Zhang

Jin

2013

Applied Energy

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“…With this fast mode of fluid bed operation, it is necessary to reduce the possible gas/particle wall friction effects, which may have been unavoidable had the model been decreased in scale. This approach of “like‐for‐like” scaling has been successfully employed previously by Bischi et al …”

Section: Methodsmentioning

confidence: 99%

A Hydrodynamic Study of a Fast‐Bed Dual Circulating Fluidized Bed for Chemical Looping Combustion

et al. 2016

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This study explores the use of a dual interconnected circulating fluidized bed (CFB) for chemical looping combustion. This design can enhance gas–solid interactions, but it is difficult to control the solid transfer and circulation rates. With the use of a 1:1 scale cold‐flow model, an investigation determining the hydrodynamic behavior of the dual CFB system has been conducted. The cold‐flow system consists of two identical fast‐bed risers, each with an internal diameter of 100 mm and a height of 7 m. The simplified cold‐flow model is based on the chemical looping Pilot‐Scale Advanced CO2 Capture Technology (PACT) facility at Cranfield. Here, we have determined the minimum fluidization and transport velocities, and we have assessed the solid density profiles, transport capacity, and potential for the dilution by air/N2 leakage into the CO2 stream exiting the fuel reactor. The experimental procedure uses two different bed materials, molochite (ceramic clay) and FE100 (iron particles), and it satisfies the dynamic scaling laws to model the bed inventory within the system. The results indicate that the two fast‐bed risers share similar density and pressure profiles. Stable circulation can be achieved through pneumatic transport. The circulation rate of the system is flexible and can be adjusted by altering the fluidization velocity in the riser and by altering the bed inventory. The gas leakage from the loop seal to the cyclone was found to be sensitive to the bed height and fluidization velocity in the loop seal. However, by maintaining a loop‐seal bed height above 600 mm during operation, the outlet stream remains undiluted.

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“…P 5 , P 10 , P 15 , base case (P 18 ), P 25 and P 30 represent the cases where the pressures at the inlet of the oxidation reactor are 5, 10, 15, 18, 25 and 30 bar, respectively. In cases P 5 , P 10 and P 15 , the air bled from the compressor in the GT system is at 5, 10 and 15 bar, respectively.…”

Section: Different Design Pressures For the Chemical Looping Reformingmentioning

confidence: 99%

“…The methods used in this paper are similar to the methods used by Nazir, Bolland and Amini [10], but the scope and analysis presented in this paper are very different and is focussed on identifying design conditions for the CLR-CC process and improving its net electrical efficiency. The net electrical efficiency reported by Nazir, Bolland and Amini [10] is also In the context of chemical looping processes, numerous studies have been reported in the literature on the choice of oxygen carrier [12,13], reactor scale experimental analysis and reactor modelling [14][15][16][17][18][19][20]. The focus in the mentioned literature was on hydrogen production and reactor performance.…”

Section: Introductionmentioning

confidence: 99%

“…Some practical knowledge of operating high pressure circulating reactors stems from the successful operation of a pressurized fluidized combustion bed power plant in Värtan, Sweden [11]. In the context of chemical looping processes, numerous studies have been reported in the literature on the choice of oxygen carrier [12,13], reactor scale experimental analysis and reactor modelling [14][15][16][17][18][19][20]. The focus in the mentioned literature was on hydrogen production and reactor performance.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Combined Cycle Power Plants with Chemical Looping Reforming of Natural Gas and Pre-Combustion CO2 Capture

2018

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Abstract:In this paper, a gas-fired combined cycle power plant subjected to a pre-combustion CO 2 capture method has been analysed under different design conditions and different heat integration options. The power plant configuration includes the chemical looping reforming (CLR) of natural gas (NG), water gas shift (WGS) process, CO 2 capture and compression, and a hydrogen fuelled combined cycle to produce power. The process is denoted as a CLR-CC process. One of the main parameters that affects the performance of the process is the pressure for the CLR. The process is analysed at different design pressures for the CLR, i.e., 5, 10, 15, 18, 25 and 30 bar. It is observed that the net electrical efficiency increases with an increase in the design pressure in the CLR. Secondly, the type of steam generated from the cooling of process streams also effects the net electrical efficiency of the process. Out of the five different cases including the base case presented in this study, it is observed that the net electrical efficiency of CLR-CCs can be improved to 46.5% (lower heating value of NG basis) by producing high-pressure steam through heat recovery from the pre-combustion process streams and sending it to the Heat Recovery Steam Generator in the power plant.

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Hydrodynamic viability of chemical looping processes by means of cold flow model investigation

Cited by 33 publications

References 28 publications

Thermodynamic analysis of chemical-looping hydrogen generation

Thermodynamic analysis of chemical-looping hydrogen generation

A Hydrodynamic Study of a Fast‐Bed Dual Circulating Fluidized Bed for Chemical Looping Combustion

Analysis of Combined Cycle Power Plants with Chemical Looping Reforming of Natural Gas and Pre-Combustion CO2 Capture

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