Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water–gas shift (SE–WGS) reaction for hydrogen production

Živković, Luka A.; Pohar, Andrej; Likozar, Blaž; Nikačević, Nikola M.

doi:10.1016/j.apenergy.2016.06.071

Cited by 44 publications

(6 citation statements)

References 35 publications

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“…(1) A two dimensional model is sufficient to describe the reaction bed (a previous study showed that the 3D effects of geometry and flow profile for reaction beds with a porosity greater than 0.8 can be neglected [26]) (2) There is a symmetry plane in the middle of the air channel (despite the single-sided steam inlet, pressure probes indicate isobaric conditions on the surface of both bulks) (3) The CaO/Ca(OH) 2 bulk can be considered as a continuum which fills the whole space between heat exchanger plate and filter plate (4) Effective heat conductivities of CaO and Ca(OH) 2 bulks are the same and constant (independent of the temperature, steam pressure and cycle number) (5) Heat transfer based on thermal radiation is negligible for the used small particles (based on [20]) (6) The thermal mass of the steam can be neglected compared to the much higher reaction enthalpy. It was calculated that the sensible heating up of the steam to equilibrium temperature, requires between 2 % and a maximum of 5 % of the released enthalpy of reaction.…”

Section: Governing and Kinetic Equationsmentioning

confidence: 99%

“…Systems based on the reaction of CaO with steam are promising for thermochemical energy storages as both reactants are cost-efficient [1] and non-toxic [2]. Besides energy storage, the application of CaO is also under development for heat pumps [3], carbon capture and storage [4] and sorption-enhanced hydrogen production [5,6]. The reaction 𝐶𝑎𝑂 (𝑠) + 𝐻 2 𝑂 (𝑔) ⇌ 𝐶𝑎(𝑂𝐻) 2(𝑠) + Δ𝐻 was already addressed by several studies.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of the hydration of calcium oxide in a fixed bed reactor based on lab-scale experiments

et al. 2020

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Section: Governing and Kinetic Equationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the hydration of calcium oxide in a fixed bed reactor based on lab-scale experiments

et al. 2020

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“…During carbonation, CaCl 2 from HCl and CaS from H 2 S were formed. After injecting air during calcination, CaCl 2 reacted with O 2 to form Cl 2 as given in reaction (7). Similarly, CaClOH as a chlorination product of CaO also reacted with O 2 in the calcination environment and enhanced Cl 2 release by reaction (8).…”

Section: Effect Of Hcl On Contaminant Removal Efficiencies and Releas...mentioning

confidence: 99%

“…The low costs and readily availability of Ca-based material makes the calcium-looping (CaL) process very promising for CO 2 capture from combustion flue gas and gasification producer gas [1][2][3][4]. Recently, the calcium looping technology has been studied to improve the producer gas quality and increase the producer gas energy content when the CO 2 sorbent material is applied to the biomass gasification process [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

Dashtestani

Nusheh²,

Siriwongrungson

et al. 2021

Energies

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This study investigated the effect of HCl in biomass gasification producer gas on the CO2 capture efficiency and contaminants removal efficiency by CaO-Fe2O3 based sorbent material in the calcium looping process. Experiments were conducted in a fixed bed reactor to capture CO2 from the producer gas with the combined contaminants of HCl at 200 ppmv, H2S at 230 ppmv, and NH3 at 2300 ppmv. The results show that with presence of HCl in the feeding gas, sorbent reactivity for CO2 capture and contaminants removal was enhanced. The maximum CO2 capture was achieved at carbonation temperatures of 680 °C, with efficiencies of 93%, 92%, and 87%, respectively, for three carbonation-calcination cycles. At this carbonation temperature, the average contaminant removal efficiencies were 92.7% for HCl, 99% for NH3, and 94.7% for H2S. The outlet contaminant concentrations during the calcination process were also examined which is useful for CO2 reuse. The pore structure change of the used sorbent material suggests that the HCl in the feeding gas contributes to high CO2 capture efficiency and contaminants removal simultaneously.

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“…As an innovative approach to this problem, the application of membrane technology for separation has begun to develop in recent years [ 6 ]. An advantage of membrane separation of the CO 2 is that a similar system could be applied not only for the flue gas treatment, but also in enriching the hydrogen produced by the water gas shift reaction [ 7 , 8 ]. Research in the modeling of membrane systems for carbon-dioxide/hydrogen separation in hydrogen production was conducted as well [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of the Temperature and Moisture to the Permeation Properties of PEO-Based Membranes for Carbon-Dioxide Separation

Nedeljković

2021

Polymers

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An increased demand for energy in recent decades has caused an increase in the emissions of combustion products, among which carbon-dioxide is the most harmful. As carbon-dioxide induces negative environmental effects, like global warming and the greenhouse effect, a decrease of the carbon-dioxide emission has emerged as one of the most urgent tasks in engineering. In this work, the possibility for the application of the polymer-based, dense, mixed matrix membranes for flue gas treatment was tested. The task was to test a potential decrease in the permeability and selectivity of a mixed-matrix membrane in the presence of moisture and at elevated temperature. Membranes are based on two different poly(ethylene oxide)-based polymers filled with two different zeolite powders (ITR and IWS). An additive of detergent type was added to improve the contact properties between the zeolite and polymer matrix. The measurements were performed at three different temperatures (30, 60, and 90 °C) under wet conditions, with partial pressure of the water equal to the vapor pressure of the water at the given temperature. The permeability of carbon-dioxide, hydrogen, nitrogen, and oxygen was measured, and the selectivity of the carbon-dioxide versus other gases was determined. Obtained results have shown that an increase of temperature and partial pressure of the vapor slightly increase both the selectivity and permeability of the synthesized membranes. It was also shown that the addition of the zeolite powder increases the permeability of carbon-dioxide while maintaining the selectivity, compared to hydrogen, oxygen, and nitrogen.

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Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water–gas shift (SE–WGS) reaction for hydrogen production

Cited by 44 publications

References 35 publications

Numerical analysis of the hydration of calcium oxide in a fixed bed reactor based on lab-scale experiments

Numerical analysis of the hydration of calcium oxide in a fixed bed reactor based on lab-scale experiments

Effect of the Presence of HCl on Simultaneous CO2 Capture and Contaminants Removal from Simulated Biomass Gasification Producer Gas by CaO-Fe2O3 Sorbent in Calcium Looping Cycles

The Effect of the Temperature and Moisture to the Permeation Properties of PEO-Based Membranes for Carbon-Dioxide Separation

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