Process simulation and thermodynamic evaluation for chemical looping air separation using fluidized bed reactors

Deng, Zhikai; Jin, Bo; Zhao, Yunlei; Gao, Hongxia; Yong, Hu; Luo, Xiao; Liang, Zhiwu

doi:10.1016/j.enconman.2018.01.039

Cited by 28 publications

(12 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“… However, the energy loss associated with the high operating temperature was not considered. Deng et al studied CLAS using a Cu-Mg mixed oxide system to determine how reduction reactor temperature, oxidation reactor temperature, and air flowrate affect the overall energy consumption . They concluded that varying the reduction temperature has the most significant impact on the overall energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Chemical Looping Air Separation Using a Perovskite-Based Oxygen Sorbent: System Design and Process Analysis

Krzystowczyk

Haribal

Dou

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Oxygen is a critical industrial gas whose global market is projected to reach $48 billion/year within this decade. However, oxygen production is highly energy-intensive because of the limited efficiency of the commercial cryogenic air separation technology. The present study systematically investigated a chemical looping air separation (CLAS) approach as an alternative to cryogenic distillation. In particular, a Sr0.8Ca0.2Fe0.4Co0.6O3−δ (SCFC) oxygen sorbent was used as the basis for both experimental and simulation studies. To demonstrate the sorbent robustness, experimental studies were carried out over 10,000 redox cycles in a bench-scale testbed. Excellent sorbent stability and >90% oxygen purity were achieved using steam as the purge gas. Oxygen purity can be further increased to >95% by optimizing the operating conditions and pressure swing absorption cycle structure. Based on the experimental results, a CLAS system design and a process model were established. The process model estimates a base case CLAS energy consumption of 0.66 MJ/kg O2. This represents a 15% decrease compared to cryogenic air separation (0.78 MJ/kg O2). It is noted that most of the thermal energy consumed by CLAS is at relatively low temperatures (∼120 °C). When accounting for the quality of this low-grade heat, an energy consumption as low as 0.40 MJ/kg O2 can be anticipated for a practical system. Sensitivity analysis was also performed on the various CLAS operational and design parameters such as reactor sizes, pressure drop, thermodynamic driving forces, oxygen uptake and release rates, heat loss, and the energy consumption for steam generation. It was determined that CLAS has excellent potential to be an efficient oxygen production technology. This study also highlights the importance of developing advanced sorbents with suitable redox thermodynamics and fast redox kinetics for improved efficiency and smaller reactor sizes.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemical Looping Air Separation Using a Perovskite-Based Oxygen Sorbent: System Design and Process Analysis

Krzystowczyk

Haribal

Dou

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…This is, however, a very complex and costly process, making it only suitable for large-scale production [122][123][124]. Chemical looping with air separation or shortly chemical looping air separation (CLAS) is a separate chemical looping derived concept, which is considered as a promising method for providing an alternative efficient and economic oxygen supply for integration into oxy-fuel combustion power plants [125,126]. In this process, an oxygen carrier is used to separate pure oxygen from the air.…”

Section: Chemical Looping Air Separationmentioning

confidence: 99%

“…Essential to the CLAS technology is the specific performance of the oxygen carrier for executing CLOU. Therefore, Cu-based, Mn-based, and Co-based materials are usually selected [125,[128][129][130]. Compared to conventional cryogenic air separation units, which are used in oxy-fuel combustion, the oxygen supply from the CLAS process can decrease the power demand and thermal energy efficiency penalty of oxy-fuel combustion, reducing its economic costs [125].…”

Section: Chemical Looping Air Separationmentioning

confidence: 99%

Development of Stable Oxygen Carrier Materials for Chemical Looping Processes—A Review

et al. 2020

View full text Add to dashboard Cite

This review aims to give more understanding of the selection and development of oxygen carrier materials for chemical looping. Chemical looping, a rising star in chemical technologies, is capable of low CO2 emissions with applications in the production of energy and chemicals. A key issue in the further development of chemical looping processes and its introduction to the industry is the selection and further development of an appropriate oxygen carrier (OC) material. This solid oxygen carrier material supplies the stoichiometric oxygen needed for the various chemical processes. Its reactivity, cost, toxicity, thermal stability, attrition resistance, and chemical stability are critical selection criteria for developing suitable oxygen carrier materials. To develop oxygen carriers with optimal properties and long-term stability, one must consider the employed reactor configuration and the aim of the chemical looping process, as well as the thermodynamic properties of the active phases, their interaction with the used support material, long-term stability, internal ionic migration, and the advantages and limits of the employed synthesis methods. This review, therefore, aims to give more understanding into all aforementioned aspects to facilitate further research and development of chemical looping technology.

show abstract

“…The mass and energy balances produced by simulation were then used to quantify the performance indicators. As main design assumptions used to build the ChemCAD simulations, Table 1 presents the most important model assumptions [14,[20][21][22][23]. Regarding the power block configurations and main parameters, the oxy-combustion concepts were evaluated considering the same super-critical steam conditions (290 bar/582 • C and two steam reheats at 75 bar/580 • C and 20 bar/580 • C) in line with current technological development.…”

Section: Assessing the Technical Performances Of Clas System Using Comentioning

confidence: 99%

Techno-Economic Evaluations of Copper-Based Chemical Looping Air Separation System for Oxy-Combustion and Gasification Power Plants with Carbon Capture

Cormoş

2018

Energies

View full text Add to dashboard Cite

Energy and economic penalties for CO2 capture are the main challenges in front of the carbon capture technologies. Chemical Looping Air Separation (CLAS) represents a potential solution for energy and cost-efficient oxygen production in comparison to the cryogenic method. This work is assessing the key techno-economic performances of a CLAS system using copper oxide as oxygen carrier integrated in coal and lignite-based oxy-combustion and gasification power plants. For comparison, similar combustion and gasification power plants using cryogenic air separation with and without carbon capture were considered as benchmark cases. The assessments were focused on large scale power plants with 350–500 MW net electricity output and 90% CO2 capture rate. As the results show, the utilization of CLAS system in coal and lignite-based oxy-combustion and gasification power plants is improving the key techno-economic indicators e.g., increasing the energy efficiency by about 5–10%, reduction of specific capital investments by about 12–18%, lower cost of electricity by about 8–11% as well as lower CO2 avoidance cost by about 17–27%. The highest techno-economic improvements being noticed for oxy-combustion cases since these plants are using more oxygen than gasification plants.

show abstract

Process simulation and thermodynamic evaluation for chemical looping air separation using fluidized bed reactors

Cited by 28 publications

References 46 publications

Chemical Looping Air Separation Using a Perovskite-Based Oxygen Sorbent: System Design and Process Analysis

Chemical Looping Air Separation Using a Perovskite-Based Oxygen Sorbent: System Design and Process Analysis

Development of Stable Oxygen Carrier Materials for Chemical Looping Processes—A Review

Techno-Economic Evaluations of Copper-Based Chemical Looping Air Separation System for Oxy-Combustion and Gasification Power Plants with Carbon Capture

Contact Info

Product

Resources

About