Experimental evaluations of solid-fueled pressurized chemical looping combustion – The effects of pressure, solid fuel and iron-based oxygen carriers

Chen, Liangyong; Kong, Liang; Bao, Jinhua; Combs, Megan; Nikolic, Heather; Fan, Zhen; Liu, Kunlei

doi:10.1016/j.apenergy.2017.03.085

Cited by 23 publications

(17 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fewer studies were reported for the kinetic of solid-fuel chemical looping combustion/gasification at elevated pressure [25,33,49]. In a typical coal-based CLC system, the reactions between coal, oxygen carrier and the gasification agent (H2O or CO2) occurs as a results of various reactions as following: (6) Coal pyrolysis (Equ.…”

Section: A)mentioning

confidence: 99%

“…The overall reaction rate was found to be increasing with increasing the pressure up to 5 bar then decreased at 10 bar, which was attributed to the negative effect of pressure on the coal pyrolysis stage [25]. Chen et al, [33] studied the effects of pressure on the reactivity of ilmenite and red mud OCs (red mud is a bauxite residue contains ~50% Fe2O3) on char gasification reactions using a fluidized-bed system. Fig.…”

Section: A)mentioning

confidence: 99%

“…5. The average gasification rate of PCLC and external gasification at various pressures [33],…”

Section: A)mentioning

confidence: 99%

See 2 more Smart Citations

Review of pressurized chemical looping processes for power generation and chemical production with integrated CO2 capture

Osman

Khan

Zaabout

et al. 2021

Fuel Processing Technology

View full text Add to dashboard Cite

Chemical looping has great potential for reducing the energy penalty and associated costs of CO2 capture from fossil fuel-based power and chemical production while maintaining high efficiency. However, pressurized operation is a prerequisite for maximizing energy efficiency in most proposed chemical looping configurations, introducing significant complexities related to system design, operation and scale-up. Understanding the effects of pressurization on chemical looping systems is therefore important for realizing the expected cost reduction of CO2 capture and speed up the industrial deployment of this promising class of technologies.This paper reviews studies that investigated three key aspects associated with pressurized operation of chemical looping processes. First, the effect of pressure on the kinetics of the various reactions involved in these processes was discussed. Second, the different reactor configurations proposed for chemical looping were discussed in detail, focusing on their suitability for pressurized operation and highlighting potential technical challenges that may hinder successful operation and scale-up. Third, techno-economic assessment studies for these systems were reviewed, identifying the process configuration and integration options that maximize the energy efficiency and minimize the costs of CO2 avoidance.Prominent conclusions from the review include the following. First, the frequently reported negative effect of pressure on reaction kinetics appears to be overstated, implying that pressurization is an effective way to intensify chemical looping processes. Second, no clear winner could be identified from the six pressurized chemical looping reactor configurations

show abstract

Section: A)mentioning

confidence: 99%

Section: A)mentioning

confidence: 99%

See 1 more Smart Citation

Review of pressurized chemical looping processes for power generation and chemical production with integrated CO2 capture

Osman

Khan

Zaabout

et al. 2021

Fuel Processing Technology

View full text Add to dashboard Cite

show abstract

“…One kilogram of mixture is enough to provide oxygen for 6.5 man-hours [47,48,49,50]. Chemical oxygen generators are the most used methods to supply oxygen in confined spaces, especially because of their long shelf life and reliability.…”

Section: How To Recycle and Produce Breathable Gases?mentioning

confidence: 99%

Water and air consumption aboard interstellar arks

Marin,

Beluffi

2020

Preprint

View full text Add to dashboard Cite

The architecture of a large interstellar spaceship, which is capable of serving as a living environment for a population over many generations, is mainly dictated by the needs of said population in terms of food, water and breathable gases. These resources cannot be stored for the entire duration of a journey that goes on for several centuries, so they must be produced in situ. In order to determine the quantities necessary for the survival of the population, it is imperative to precisely estimate their needs. In this article, we focus on accurate simulations of the water and air (oxygen) requirements for any type of population in order to be able to provide precise constraints on the overall architecture of an interstellar ark (the requirements in terms of food having already been studied in a previous publication). We upgrade our agent-based, numerical, Monte Carlo code HERITAGE to include human physiological needs. Our simulations show that, for a crew of about 1 100 crew members (each characterized with individual anthropometric and biological data), 1.8 × 10 8 litres of oxygen are annually required, together with 1.1 × 10 6 litres of water. Those results do not account for oxygen and water used in growing plants, but they give us an insight of how much resources are needed in the spaceship. We also review the best methods for generating water from waste gases (namely carbon dioxide and dihydrogen) and how such system could complement the oxygen-supplying biospheres inside multi-generational spaceship to form a closed and controlled environment.

show abstract

“…As a consequence, the studies on pressurized chemical looping operations are still very limited. 40 − 43…”

Section: Introductionmentioning

confidence: 99%

Combined Syngas and Hydrogen Production using Gas Switching Technology

Ugwu

Zaabout

Donat

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

This paper focuses on the experimental demonstration of a three-stage GST (gas switching technology) process (fuel, steam/CO 2 , and air stages) for syngas production from methane in the fuel stage and H 2 /CO production in the steam/CO 2 stage using a lanthanum-based oxygen carrier (La 0.85 Sr 0.15 Fe 0.95 Al 0.05 O 3 ). Experiments were performed at temperatures between 750–950 °C and pressures up to 5 bar. The results show that the oxygen carrier exhibits high selectivity to oxidizing methane to syngas at the fuel stage with improved process performance with increasing temperature although carbon deposition could not be avoided. Co-feeding CO 2 with CH 4 at the fuel stage reduced carbon deposition significantly, thus reducing the syngas H 2 /CO molar ratio from 3.75 to 1 (at CO 2 /CH 4 ratio of 1 at 950 °C and 1 bar). The reduced carbon deposition has maximized the purity of the H 2 produced in the consecutive steam stage thus increasing the process attractiveness for the combined production of syngas and pure hydrogen. Interestingly, the cofeeding of CO 2 with CH 4 at the fuel stage showed a stable syngas production over 12 hours continuously and maintained the H 2 /CO ratio at almost unity, suggesting that the oxygen carrier was exposed to simultaneous partial oxidation of CH 4 with the lattice oxygen which was restored instantly by the incoming CO 2 . Furthermore, the addition of steam to the fuel stage could tune up the H 2 /CO ratio beyond 3 without carbon deposition at H 2 O/CH 4 ratio of 1 at 950 °C and 1 bar; making the syngas from gas switching partial oxidation suitable for different downstream processes, for example, gas-to-liquid processes. The process was also demonstrated at higher pressures with over 70% fuel conversion achieved at 5 bar and 950 °C.

show abstract

Experimental evaluations of solid-fueled pressurized chemical looping combustion – The effects of pressure, solid fuel and iron-based oxygen carriers

Cited by 23 publications

References 30 publications

Review of pressurized chemical looping processes for power generation and chemical production with integrated CO2 capture

Review of pressurized chemical looping processes for power generation and chemical production with integrated CO2 capture

Water and air consumption aboard interstellar arks

Combined Syngas and Hydrogen Production using Gas Switching Technology

Contact Info

Product

Resources

About