Influence of ash composition on high temperature CO2 sorption

Miklová, Barbora; Staf, Marek; Kyselová, Veronika

doi:10.1016/j.jece.2019.103017

Cited by 9 publications

(3 citation statements)

References 20 publications

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“…An experimental apparatus for the adsorption experiments was built on the basis of a former hightemperature fluidized bed system [25]. Details are listed in Table 1 and Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

2022

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This paper focuses on the laboratory experiments of low-temperature adsorption of CO2 at elevated pressure and on the validation of our mathematical model with the data obtained. The numerical approach uses fitting of adsorption isotherm parameters and sensitivity analysis of parameters influencing the breakthrough curve shape and onset time. We first evaluate the results of breakthrough experiments for zeolite 13X. Then, we use the results obtained to design a dynamic mathematical model to predict the breakthrough curve profile. Experimental results show that zeolite 13X possesses high adsorption capacities (over 10 % of its weight at adsorption temperatures of 293 K and below), as expected. The mathematical simulation was accurate at predicting the breakthrough onset time; however, this prediction accuracy declined with the outlet CO2 concentration exceeding 75 %, which is discussed. The sensitivity analysis indicated that the choice of different estimates of mass transport and bed porosity, as well as the choice of numerical scheme, can lead to a more accurate prediction, but the same set of parameters is not suitable for all process conditions.

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“…An experimental apparatus for the adsorption experiments was built on the basis of a former hightemperature fluidized bed system [25]. Details are listed in Table 1 and Figure 1.…”

Section: Methodsmentioning

confidence: 99%

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

2022

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“…Shahtalebi et al [15] point out that the costs in coalbed methane thermal production limit the economic effectiveness. Only when the price of natural gas is comparatively higher and the demand for clean energy is stronger, the method of thermal production can become an economically attractive option.CBM thermal recovery benefits a lot from the enhanced gas adsorption behavior [16][17][18]. Sakurovs et al [19] presented three sets of experimental sorption evolutions at variable temperature.…”

mentioning

confidence: 99%

“…CBM thermal recovery benefits a lot from the enhanced gas adsorption behavior [16][17][18]. Sakurovs et al [19] presented three sets of experimental sorption evolutions at variable temperature.…”

mentioning

confidence: 99%

Mathematical Modeling and Simulation on the Stimulation Interactions in Coalbed Methane Thermal Recovery

Teng

Wang

et al. 2019

Processes

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Heat stimulation of coalbed methane (CBM) reservoirs has remarkable promotion to gas desorption that enhances gas recovery. However, coalbed deformation, methane delivery and heat transport interplay each other during the stimulation process. This paper experimentally validated the evolutions of gas sorption and coal permeability under variable temperature. Then, a completely coupled heat-gas-coal model was theoretically developed and applied to a computational simulation of CBM thermal recovery based on a finite element approach of COMSOL with MATLAB. Modeling and simulation results show that: Although different heat-gas-coal interactions have different effects on CBM recovery, thermal stimulation of coalbed can promote methane production effectively. However, CBM thermal recovery needs a forerunner heating time before the apparent enhancement of production. The modeling and simulation results may improve the current cognitions of CBM thermal recovery.Processes 2019, 7, 526 2 of 16 that the reservoir temperature increases 30 • C in twelve years to finally expand the methane production by 58% compared to the conventional method of direct recovery. Li et al.[12] established a mathematical model before demonstrating the complicated couplings among coalbed, methane and temperature. The model was then applied to a CBM thermal recovery of microwave heating. Research results show that thermal stimulation with microwave expands methane recovery more than 40% due to the deformation induced by gas sorption. Khoshnevis et al. [13] investigated the synergy type of gas production by injecting geothermal water. They established a three-dimension model to discuss the production potential of gas field and the influences of injection rate, reservoir permeability, saturation condition on the ultimate methane production. Lu [14] proposed a numerical simulation of heat injection into a three-dimensional temperature field by ANSYS to evidence the increasing production of CBM with temperature due to the easier desorption with higher temperature. Shahtalebi et al. [15] point out that the costs in coalbed methane thermal production limit the economic effectiveness. Only when the price of natural gas is comparatively higher and the demand for clean energy is stronger, the method of thermal production can become an economically attractive option.CBM thermal recovery benefits a lot from the enhanced gas adsorption behavior [16][17][18]. Sakurovs et al. [19] presented three sets of experimental sorption evolutions at variable temperature. The results show that the methane adsorption capacity has great dependency with coal temperature. The sorption of coal to methane at different temperature ranges may indicate different behaviors, and a traditional Langmuir equation cannot describe the different trends. For example, Guan et al. [20,21] estimated the adsorption isotherms at temperatures from 283 K to 343 K. They find that the adsorption capacity of CBM decreases linearly with increasing temperature at the range of 283 K to 323 K, and keeps...

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Modification of waste sugarcane bagasse fly ash for CO2 capture application

Sukkathanyawat

Bampenrat

Jarunglumlert

et al. 2022

Mater Renew Sustain Energy

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CO2 capture is a promising approach to aid in the mitigation of the global environmental crisis caused by greenhouse gas emissions. The efficiency of adsorbents is critical to the success of this approach. Sugarcane bagasse fly ash (SBA) was used in this study as a support to increase the CO2 adsorption capacity of CaO. The physical and chemical characteristics of SBA treated with various reagents (HCl, H3PO4, CH3COOH, NaOH, NH3, and H2O2) were investigated. The CaO was then loaded at 10–50 wt% on the support surface, and the modified adsorbent was tested for its potential to adsorb CO2. According to the results of the experiments, the acidic reagent increased the surface area of SBA, whereas the base reagents provided SBA with a higher pore volume and a larger pore size. The different surface characteristics of the modified SBA had a direct impact on its CO2 adsorption capacity. The adsorbent with NaOH-pretreated SBA and 50% CaO loading had the highest CO2 adsorption capacity, which was 27% higher than that of unsupported CaO due to the decent distribution of CaO found on the NaOH-treated SBA surface. For a better understanding, a graphical model was finally proposed to describe the aforementioned changes in surface characteristics and adhesion of CaO on the SBA support. These findings show that SBA, a valueless bagasse-incinerating waste material, can be used as a support to increase the CO2 adsorption capacity of adsorbents, transforming it into a more valuable and environmentally sustainable material. Graphical abstract

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Influence of ash composition on high temperature CO2 sorption

Cited by 9 publications

References 20 publications

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

Experimental and simulation study of CO2 breakthrough curves in a fixed-bed adsorption process

Mathematical Modeling and Simulation on the Stimulation Interactions in Coalbed Methane Thermal Recovery

Modification of waste sugarcane bagasse fly ash for CO2 capture application

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