Article
Thermodynamics
Yang Bai, Hai-Fei Lin, Shu-Gang Li, Min Yan, Hang Long
Summary: The study found that CO2 and N-2 primarily displace methane gas by occupying adsorption sites, leading to a lower total energy in the CH4-CO2 model. With an increase in temperature, the concentration and motion velocity of CH4 in the vacuum layer increased, with a reduction in the diffusion activation energy of CH4 in different models by 20.53% under conditions of injecting CO2.
Article
Engineering, Chemical
Ran Yang, Shilin Liu, Haitao Wang, Zengmin Lun, Xia Zhou, Chunpeng Zhao, Chungang Min, Han Zhang, Yi Xu, Dengfeng Zhang
Summary: The presence of H2O in coal influences the adsorption of CO2 and CH4, with coal containing oxygenic functional groups and mesopores being positively correlated with H2O. The impact of H2O on CO2 adsorption depends on its dissolution capability and competitive adsorption. Injecting CO2 promotes desorption of adsorbed CH4 from coal, with a lower CO2 adsorption amount at equilibrium state for displacement at equilibrium pressures below 3 MPa.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Thermodynamics
Yang Bai, Hai-Fei Lin, Shu-Gang Li, Hang Long, Min Yan, Yong Li, Lei Qin, Bin Zhou
Summary: Research has shown that gas injection displacement, especially using N-2 injection, can effectively enhance gas extraction in coal seams and promote the mechanism of gas desorption.
Article
Thermodynamics
Gang Bai, Jun Su, Zunguo Zhang, Anchang Lan, Xihua Zhou, Fei Gao, Jianbin Zhou
Summary: Injecting CO2 into coal seams is an effective way to increase methane recovery. Research shows that when the CO2 injection amount is below the critical value, the desorption amount of CH4, CO2 storage, and gas content all increase; when the injection amount exceeds the critical value, all parameters except for the CH4 desorption amount increase.
Article
Thermodynamics
Gang Bai, Jun Su, Xueming Li, Chunsheng Guo, Mingxu Han, Xihua Zhou, Chaojun Fan
Summary: The study proposes an SBS-CO2 method that gradually increases the CO2 injection pressure, which can improve the total recovery rate of methane and reduce the risk of CO2 consumption and outburst compared to the traditional constant CO2 injection pressure method.
Article
Geosciences, Multidisciplinary
Long Wang, Zhiliang Deng, Xinlei Wang, Zhaofeng Wang, Longsheng Hu, Pengtao Zhao
Summary: This paper investigates the displacement of CH4 in tectonic coal under different gas-driving modes. The results show that the displacement of CH4 is influenced by changes in CH4 partial pressure and multi-gas competitive adsorption. The displacement effect of CO2 injection is generally more significant than that of N-2 injection due to the interaction between CO2 and the anthracite molecule.
NATURAL RESOURCES RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Jianchi Hao, Hu Wen, Li Ma, Jinbiao Fei, Lifeng Ren
Summary: This study analyzes the adsorption characteristic curves of three coal samples for CO2, finding that the curves are independent of temperature and have a negative correlation between adsorption potential and adsorbed phase volume. A prediction model for CO2 adsorption by coal is derived based on the adsorption potential theory, showing accurate and reliable results. The model can predict adsorption capacity under different temperature and pressure conditions with a strong correlation to experimental data, making it a valuable tool for practical applications.
Article
Nanoscience & Nanotechnology
Xuefeng Wang, Cunbao Deng, Ling Qiao, Ge Chu, Rui Jing, Yanlei Kang
Summary: The study found that moisture, pH value, and coal rank all affect the adsorption capacity of coal for CO2. Acid treatment and alkaline treatment can enhance the adsorption capacity of coal, while the presence of moisture inhibits the adsorption process.
Article
Chemistry, Multidisciplinary
Theodora Noely Tambaria, Yuichi Sugai, Ferian Anggara
Summary: Understanding the inhibitory factors affecting CO(2) adsorption on low-rank coal from shallow depths is important for CO(2) sequestration. Experimental data showed that dry coal had higher CO(2) adsorption capacity compared to raw coal. Statistical analysis showed that Langmuir and Freundlich models fit the data well. Coal with high huminite content had higher CO(2) adsorption potential, while coal with high inertinite content inhibited CO(2) adsorption. Drying process improved CO(2) adsorption.
Article
Geochemistry & Geophysics
Mingyang Liu, Hu Wen, Shixing Fan, Zhenping Wang, Jinbiao Fei, Gaoming Wei, Xiaojiao Cheng, Hu Wang
Summary: This study investigates the gas drainage under different injection pressures through displacement and in situ experiments. The results show that increasing pressure can enhance methane production but decrease displacement ratio. Medium-pressure injection has better sweep efficiency and higher gas drainage purity compared to low-pressure injection.
Article
Energy & Fuels
Shuaifang Guo, Yunxing Cao, Junsheng Zhang, Xinsheng Zhang, Bingbing Meng, Shimin Liu
Summary: High-pressure CO2 gas fracturing is a novel technology to improve coal-seam permeability and increase gas extraction efficiency. However, the understanding of the pore-microfracture evolution characteristics and damage mechanism induced by CO2-Frac is still limited.
Article
Thermodynamics
Wansheng Mi, Hu Wen, Shixing Fan, Shibin Wang, Xueming Wu, Gaoming Wei, Bocong Liu, Rijun Li, Xiaojiao Cheng, Mingyang Liu
Summary: A combination of theoretical analysis and a downhole pilot test was used to study the injection parameters of liquid CO2 for displacing CH4 in a coal seam. The results showed that the higher the injection pressure, the greater the effective displacement radius of CO2 and the longer the influence period of CO2 pressure injection, resulting in increased CH4 extraction. The optimal injection pressure and volume for low-medium pressure injection of liquid CO2 were determined to be 7.5 MPa and 7.4 m3, respectively.
Article
Energy & Fuels
Min Hao, Zhen Qiao, Heng Zhang, Yilin Wang, Yanlong Li
Summary: The study revealed the adsorption properties and thermodynamic parameters of different gases on a coal surface using molecular simulation method. The results showed that gas adsorption is heterogeneous, thermodynamically spontaneous and exothermic. The adsorption capacity of the gases on a coal surface follows the sequence of CO2 > CH4 > N-2.
Article
Chemistry, Multidisciplinary
Hu Wen, Jianchi Hao, Li Ma, Xuezhao Zheng
Summary: The study revealed that the process of CO2 replacing CH4 can be divided into different stages, with desorption amount varying with time and temperature, and replacement ratio showing a positive correlation with replacement time. Overall, an increase in CO2 injection pressure would result in higher cumulative displacement ratio.
Article
Energy & Fuels
Bin Shi, Yunxing Cao, Lin Tian, Junsheng Zhang, Shimin Liu
Summary: This study conducted a CO2 gas fracturing (CO2-Frac) experiment in an area with steeply inclined multicoal seam formations. The results showed that using CO2 fracturing in in-seam boreholes and penetration boreholes significantly improved the efficiency of gas drainage. The fractures radius of CO2-Frac in the penetrating borehole was larger than in the in-seam boreholes, which may be related to the developing property of bedding and cleat system in coal seam.
Article
Thermodynamics
Hao Luo, Zhimin Lu, Peter Arendt Jensen, Peter Glarborg, Weigang Lin, Kim Dam-Johansen, Hao Wu
Summary: The impact of gasification reactions on biomass char conversion was studied through single particle experiments and modeling. It was found that char oxidation is limited by mass transfer, while char gasification is controlled by both mass transfer and gasification kinetics. Sensitivity analysis revealed that CO oxidation and gasification kinetics significantly influence char conversion time.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Green & Sustainable Science & Technology
Yifan Du, Weigang Lin, Peter Glarborg
Summary: The study explored the influence of potassium chloride (KCl) on fine particle emissions from wood burning. It was found that the presence of KCl led to a decrease in ultrafine particle emissions and an increase in emissions of larger particles. Additionally, the emission factors of organic compounds and soot particles increased with higher KCl content.
Article
Thermodynamics
Yifan Du, Peter Glarborg, Weigang Lin
Summary: The experimental study on the influence of potassium chloride (KCl) and potassium hydroxide (KOH) in the fuel-rich oxidation of methane showed that the addition of both potassium salts can promote the formation of acetylene and benzene, especially at lower temperatures.
COMBUSTION AND FLAME
(2021)
Article
Engineering, Chemical
Mohamadali Mirzaei, Peter Arendt Jensen, Mohammadhadi Nakhaei, Hao Wu, Sam Zakrzewski, Haosheng Zhou, Weigang Lin
Summary: This study developed a hybrid multiphase model (Dense Discrete Phase Model, DDPM) coupled with an agglomeration model and a sub-grid drag model to simulate industrial-scale cyclones with high solid loading. The model was validated using experimental results from a pilot-scale cyclone with a diameter of 1.6 m, and it successfully captured key trends such as improvement in separation efficiency and reduction in pressure drop with increased particle load. The study concluded that including the agglomeration model is crucial for accurate predictions of pressure drop and separation efficiency, especially for cases involving very fine particles (d < 15 μm), while the sub-grid drag modification improves the prediction of separation efficiency.
Article
Thermodynamics
Haiwei He, Lifang Hao, Chuigang Fan, Songgeng Li, Weigang Lin
Summary: This study investigates the reaction mechanism of CaS oxidation into CaO with CO2 in a two-step phosphogypsum decomposition process. Several side reactions were observed at low temperatures during non-isothermal tests, while full conversion was achieved in isothermal tests. The presence of impurities from phosphogypsum may have a catalytic effect on the reaction temperature.
THERMOCHIMICA ACTA
(2022)
Article
Engineering, Chemical
Casper S. Svith, Weigang Lin, Kim Dam-Johansen, Hao Wu
Summary: The Selective Non-Catalytic Reduction (SNCR) process was investigated in a bench scale cyclone reactor through experiments and modelling. The results showed that high NO reduction and NH3/NO ratios can be achieved under specific operating conditions. The models were able to qualitatively predict the trends of NO reduction and ammonia slip, although the ammonia slip was over-predicted in most cases. Temperature and kinetics had a significant impact on the outlet concentrations. The compartment model accurately reproduced the cyclone's NO concentration profiles and provided a qualitative prediction of the NH3 profiles. The choice of bypass fractions had a significant influence on the ammonia profiles.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2022)
Article
Engineering, Chemical
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: This study utilizes the Eulerian-Lagrangian multiphase particle-in-cell method to simulate the injection of a gas-liquid spray into a gas-solid fluidized bed. The model accurately predicts the gas temperature distribution within the injection region, but discrepancies may arise due to the presence of wet particle agglomerates in the spray region.
CHEMICAL ENGINEERING SCIENCE
(2022)
Article
Engineering, Chemical
Mohamadali Mirzaei, Peter Arendt Jensen, Mohammadhadi Nakhaei, Hao Wu, Sam Zakrzewski, Haosheng Zhou, Weigang Lin
Summary: The Dense Discrete Phase Model coupled with an agglomeration model is developed and validated for the simulation of industrial cyclones with high solid loads. The performance of the model is influenced by sub-models, model parameters, and numerical parameters. A sensitivity analysis was conducted to optimize the model's performance, identifying the turbulence model and particle-particle restitution coefficient as having the strongest influence. The study recommends a set of sub-models, model parameters, and numerical parameters for accurately predicting the hydrodynamics of large-scale highly loaded cyclones.
Article
Thermodynamics
Hao Luo, Xinyan Liu, Lukasz Niedzwiecki, Xiaoqin Wu, Weigang Lin, Bona Lu, Wei Wang, Hao Wu
Summary: This study analysed the effects of model dimensionality, particle shrinkage, and boundary layer reactions on particle-scale modelling of biomass char conversion under pulverized fuel combustion conditions using six models. The 1D_SPM_BH model with consideration of intra-particle heat and mass transfer, particle shrinkage, and boundary layer reactions was found to be the most appropriate model for biomass char conversion. The 0D_Cons model provided a good approximation for small particle size at specific temperatures, while the 0D_SPM model overestimated the char conversion rate. Considering intra-particle heat and mass transfer improved the model prediction of char conversion time and reaction contributions, and boundary layer reactions had a significant effect on char conversion prediction for large particles and high temperatures.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Engineering, Environmental
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Sonnik Clausen, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: The cracking of sugars to glycolaldehyde and other oxygenates shows potential in lab-scale fluidized beds. This study adopts a gas-phase kinetics model and implements it into the Computational Particle Fluid Dynamics (CPFD) framework to simulate sugar cracking in a pilot-scale circulating fluidized bed riser. The results show good agreement with experimental data and suggest the need for more accurate predictions of product yields.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Mohamadali Mirzaei, Sonnik Clausen, Hao Wu, Sam Zakrzewski, Mohammadhadi Nakhaei, Haosheng Zhou, Kasper Martin Jonck, Peter Arendt Jensen, Weigang Lin
Summary: A hybrid multiphase model (Dense Discrete Phase Model, DDPM) coupled with a k-omega sst turbulence model, which includes gas-solid heat exchange, was developed to simulate industrial-scale cyclone preheaters with high solid loadings. The model was validated by experimental measurements, including pressure drop, gas and particle exit temperature, local gas velocity profiles (measured using LDA), and gas temperature profiles (measured using thermocouple and FTIR). The model showed reasonable agreement with the experimental data and accurately captured major trends caused by changes in operating parameters.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Haiwei He, Chuigang Fan, Songgeng Li, Weigang Lin
Summary: This study proposes a reductive decomposition method for phosphogypsum to produce CaO under a CO2 atmosphere, aiming to avoid the presence of CaS in the product. Thermogravimetric tests combined with thermodynamic analysis reveal three reaction stages: CaSO4 reduction, reaction between CaS and CaSO4, and CaS oxidation by CO2. The reaction path is influenced by the C/CaSO4 molar ratio and temperature. Experiments conducted in a fluidized bed reactor show that over 96.2% of CaSO4 in phosphogypsum can be decomposed into CaO at 1000°C and a C/CaSO4 molar ratio of 1.0 within 83.7 minutes. Phosphogypsum decomposition in air or nitrogen leads to lower CaO production. Additionally, kinetic analyses of CaS oxidation with CO2 in the presence of CaSO4 are performed to understand the effect of the CaS-CaSO4 reaction on the CaS-CO2 reaction.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Review
Engineering, Chemical
Frederik Zafiryadis, Anker Degn Jensen, Weigang Lin, Elisabeth Akoh Hove, Morten Boberg Larsen, Hao Wu
Summary: This paper provides a thorough and up-to-date review of experimental and numerical investigations of gas-liquid sprays into gas-solid fluidized beds. It presents a phenomenological description of the prevalent mechanisms of gas-liquid injection under different operating conditions and identifies suitable computational fluid dynamic models for simulating the mechanisms involved in gas-liquid-solid interactions, along with recommendations for future work.
Article
Engineering, Chemical
Mohamadali Mirzaei, Sonnik Clausen, Hao Wu, Mohammadhadi Nakhaei, Haosheng Zhou, Kasper Jonck, Peter Arendt Jensen, Weigang Lin
Summary: The Dense Discrete Phase Model (DDPM) was used with Oka's erosion model to investigate erosion caused by solid particle impacts in an industrial cyclone preheater. The model's predictions of flow pattern and temperature profile were validated with measurements in an industrial cyclone preheater, as well as against results from a lab-scale cyclone in the literature. The model also successfully predicted the erosion patterns observed in the industrial cyclone preheater, and parametric studies showed that gas flow rate and inlet temperature had the greatest impact on erosion.
Article
Engineering, Environmental
Yuan Chen, Lin Du, Songgeng Li, Wenli Song, Peter Arendt Jensen, Weigang Lin
Summary: This study comprehensively investigated the pyrolysis of antibiotic mycelial dreg (AMD), focusing on the impact of pyrolysis temperature on product yields and characteristics, as well as the release and distribution of nitrogen and phosphorus, and residue of antibiotics. The results showed that a low pyrolysis temperature is recommended for efficient recycling of nitrogen and phosphorus during the treatment of AMD.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
