Analysis of thermally coupled chemical looping combustion-based power plants with carbon capture

Iloeje, Chukwunwike O.; Zhao, Zhijun; Ghoniem, Ahmed F.

doi:10.1016/j.ijggc.2015.01.013

Cited by 17 publications

(15 citation statements)

References 36 publications

(50 reference statements)

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“…The required high quality heat and large temperature swing could be replaced by an isothermal redox operation, hence leading to a much reduced cost, enhanced stability [23][24][25][26] , and improved system efficiency [27][28] . In contrast to TCWS, the net reaction, combining eqs.…”

Section: Introductionmentioning

confidence: 99%

Redox Kinetics Study of Fuel Reduced Ceria for Chemical-Looping Water Splitting

Zhao¹,

Uddi

Цветков³

et al. 2016

J. Phys. Chem. C

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Chemical-looping water splitting is a novel and 8 promising technology for hydrogen production with CO 2 separation. that the reduction is the rate-limiting step, and it determines the total amount of hydrogen produced in the following oxidation 22 step. The redox kinetics is modeled using a two-step surface chemistry (an H 2 O adsorption/dissociation step and a charge-23 transfer step), coupled with the bulk-to-surface transport equilibrium. Kinetics and equilibrium parameters are extracted with 24 excellent agreement with measurements. The model reveals that the surface defects are abundant during redox conditions, and 25 charge transfer is the rate-determining step for H 2 production. The results establish a baseline for developing new materials and 26 provide guidance for the design and the practical application of water splitting technology (e.g., the design of OC characteristics, 27 the choice of the operating temperatures, and periods for redox steps, etc.). The method, combining well-controlled experiment 28 and detailed kinetics modeling, enables a new and thorough approach for examining the defect thermodynamics in the bulk and 29 at the surface, as well as redox reaction kinetics for alternative materials for water splitting.

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Section: Introductionmentioning

confidence: 99%

Redox Kinetics Study of Fuel Reduced Ceria for Chemical-Looping Water Splitting

Zhao¹,

Uddi

Цветков³

et al. 2016

J. Phys. Chem. C

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“…The concept was proposed by Richter and Knoche [4] and a first-of-its-kind CLC-based power generation cycle was presented by Ishida and Jin [5], Ishida, et al [6]. CLC converts the chemical energy of the fossil fuel into heat at relatively low temperatures (T ≈ 800-1100 • C) [7][8][9]. On the other hand, CLR converts the chemical energy of fossil fuel into a H 2 rich fuel, which combusts and results in streams of higher temperature (T ≈ 1400-1500 • C) [10].…”

Section: Introductionmentioning

confidence: 99%

“…CLC converts the chemical energy of the fossil fuel into heat at relatively low temperatures (T ≈ 800-1100 °C) [7][8][9]. On the other hand, CLR converts the chemical energy of fossil fuel into a H2 rich fuel, which combusts and results in streams of higher temperature (T ≈ 1400-1500 °C) [10].…”

Section: Introductionmentioning

confidence: 99%

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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“…Currently, most reports on the process integration of power plants with CLC are limited to steady‐state analysis . In these studies, the CLC system is modeled on the basis of simplifications of the reactor hydrodynamics and gas–solid kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Currently,m ost reports on the process integration of powerp lants with CLC arel imited to steady-state analysis. [23][24][25][26] In these studies,t he CLC system is modeled on the Chemical-looping combustion (CLC)i sapromising and efficient method for power generation with in situ CO 2 capture. In this work, we focus on high-pressure fixed-bed CLCr eactors integrated with combined cycle (CC) power plants.…”

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confidence: 99%

Dynamic Simulation of Fixed‐Bed Chemical‐Looping Combustion Reactors Integrated in Combined Cycle Power Plants

2016

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Chemical‐looping combustion (CLC) is a promising and efficient method for power generation with in situ CO2 capture. In this work, we focus on high‐pressure fixed‐bed CLC reactors integrated with combined cycle (CC) power plants. Specifically, the dynamic nature of fixed‐bed chemical‐looping reactors and the many kinetically controlled reactions necessitate the use of dynamic modeling to evaluate power plant performance, efficiency, stability, and feasibility under transient operation. We present a dynamic model for an integrated CLC–CC power plant and transient analyses of the integrated plant performance. A network of dynamically operated fixed‐bed reactors fed with natural gas comprises the CLC plant component. A dynamic model is developed and tuned to match the performance of a commercial combined cycle power plant. The transient variations of the integrated plant in terms of power, temperature, and pressure profiles are presented. The simulation results show that despite the inherent batch‐type operation of the CLC reactor, the operation of the combined cycle is relatively unaffected, and there are small oscillations of approximately 2 % around the desired steady‐state conditions.

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Analysis of thermally coupled chemical looping combustion-based power plants with carbon capture

Abstract: Abstract

Cited by 17 publications

References 36 publications

Redox Kinetics Study of Fuel Reduced Ceria for Chemical-Looping Water Splitting

Redox Kinetics Study of Fuel Reduced Ceria for Chemical-Looping Water Splitting

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

Dynamic Simulation of Fixed‐Bed Chemical‐Looping Combustion Reactors Integrated in Combined Cycle Power Plants

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