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Unraveling the disparity of CO2 sorption on alkali carbonates under high humidity

JOURNAL OF CO2 UTILIZATION 2021年 53卷

作者： Cai, Tianyi Chen, Xiaoping Tang, Hongjian Zhou, Wu Wu, Ye Zhao, Chuanwen Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Southeast Univ Sch Energy & Environm Minist Educ Key Lab Energy Thermal Convers & Control Nanjing 210096 Peoples R China Natl Univ Singapore Dept Chem & Biomol Engn Singapore Singapore Nanjing Univ Sci & Technol Sch Energy & Power Engn MIIT Key Lab Thermal Control Elect Equipment Nanjing 210094 Peoples R China Nanjing Univ Sci & Technol Sch Energy & Power Engn Adv Combust Lab Nanjing 210094 Peoples R China Nanjing Normal Univ Sch Energy & Mech Engn Engn Lab Energy Syst Proc Convers & Emiss Control Nanjing 210042 Peoples R China

CO2 emissions from fossil fuel combustion have been closely associated with the rapid climate change and potential crisis on human society. Na2CO3-based and K2CO3-based solid sorbents have been demonstrated as promising candidates for post-combustion CO2 capture. Despite their physicochemical similarities in many respects, the rationale that endows Na2CO3 and K2CO3 with disparate performance in CO2 sorption is still indeterminate, which motivates us to unravel from the atomic level. Herein, taking moisture effect on carbonation as a starting point, different hydrophilicity and deliquescence between Na2CO3 and K2CO3 are investigated by integrating experimental investigations and theoretical verifications. The results manifest a bigger radius of K+ renders higher cationic hydration on K2CO3 surface, leading to its stronger H2O affinity and easier deliquescence than that of Na2CO3. Under identical humid settings, K+ is observed to diffuse remarkably faster than Na+, accordingly, facilitating a desirable CO2 carbonation performance over K2CO3 sorbents. In this regard, amelioration strategies on Na2CO3 by tuning hydrophilicity are proposed and further demonstrated experimentally. This work provides a fresh perspective to comprehend the carbonation mechanism by solid alkali carbonates as well as practical guidelines for rational sorbents design to boost post-combustion CO2 reduction.

关键词： CO2 reduction Alkali carbonates Deliquesce Density functional theory Molecular simulation

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RECENT ADVANCES OF SURFACE WETTABILITY EFFECT ON flow BOILING heat transfer PERFORMANCE

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Frontiers in heat and Mass transfer 2021年 17卷

作者： Cao, Shuang Yang, Hui Zhao, Luxing Wang, Tao Xie, Jian School of Energy and Power Engineering Zhengzhou University of Light Industry Zhengzhou450002 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China

flow boiling heat transfer is an effective way to fulfill the energy transfer. The wettability of boiling surface influences the liquid spreading ability and the growth, departure, and release frequency of bubbles, which determines the heat transfer performance. According to the wettability and combination forms, boiling surface are classified into weak wetting surface, strong wetting surface, and heterogeneous wetting surface. Fabricating by physical, chemical method or coating the original surface with a layer of low surface energy, the weak wetting surface has more effective activation point and nucleation center density to improve heat transfer performance at low heat flux. The strong wetting surface always formed by physical or chemical treatment to enhance the rapid rewetting of the wall surface. It has a smaller bubble separation diameter, higher separation frequency and higher CHF. The heterogeneous wetting surface, having the synthetic effects of the strong and weak surface wettabilities, is a hot issue of recent study. But its composition and heat transfer enhancement mechanism are very complicated which need to study thoroughly. Furthermore, the intelligent wetting surface, having the dynamics wettability function, is also briefly analyzed in this paper. Despite the advances in this aspect, the boiling surfaces can be further optimized by fabricate effective wettability to achieve a strong stability, high heat transfer performance and realize the synergistic effect of flow pattern and heat transfer. © 2021, Global Digital Central. All rights reserved.

关键词： Wetting

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Lattice Boltzmann simulation of non-Fourier heat conduction with phase change

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NUMERICAL heat transfer PART A-APPLICATIONS 2019年第1期76卷 19-31页

作者： Liu, Yi Li, Ling Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

The lattice Boltzmann method (LBM) combined with the enthalpy method is a very effective method to solve the solid-liquid phase transition problem. However, when the heat flux is very high or the time of the process is in the same order of magnitude as the relaxation time, it is necessary to consider the non-Fourier effect in heat conduction. At this time, whether the LBM-BGK format based on Bhatnagar-Gross-Krook (BGK) approximation is still valid remains to be discussed. In this paper, the hyperbolic lattice Boltzmann method (HLBM) is combined with the enthalpy method to solve the non-Fourier solid-liquid phase change problem. By solving the non-Fourier heat conduction problem and the Fourier solid-liquid phase change problem, the numerical solution is compared with the analytical solution to verify the accuracy of the algorithm. The effect of different relaxation times on the solid-liquid phase transition is analyzed. In addition, the effect of changes in thermal diffusivity due to state changes on the non-Fourier solid-liquid phase transition is discussed.

关键词： Relaxation time

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Understanding effect of phosphorus-based additive on ash deposition characteristics during high-sodium and high-calcium Zhundong coal combustion in drop-tube furnace

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FUEL 2021年 287卷

作者： Yu, Zhihao Jin, Jing Hou, Fengxiao Zhang, Yunpeng Wang, Guangxu Liu, Bojianzhi Zhai, Zhongyuan Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shanghai Boiler Works Co Ltd 250 Huangning Rd Shanghai 200245 Peoples R China

Zhundong coal as a high quality steam coal has not been widely utilized due to severe fouling and slagging problems during combustion. To promote clean utilization of Zhundong coal, combustion experiments of Zhundong coal were carried out in the drop tube furnace (DTF). The influence of novel phosphorus-based additive on ash deposition characteristics of Zhundong coal was studied. The appearance and phase composition of the raw coal and mixed coal ash deposits at different flue gas temperatures were researched respectively. The new prediction index of slagging tendency containing phosphorus was proposed, and the balance calculation were performed by FactSage thermodynamic software in different flue gas temperatures, including experimental temperatures selected. The results showed that the values of new indexes for predicting slagging tendency had obvious changes, and the phosphorus-based additive had a significant effect on the ash deposition behavior during the combustion process of Zhundong coal in DTF. Compared with the raw coal, the mixed coal with additive had higher ash fusion points and were in the form of loose, crisp, and porous powder, which was beneficial for soot blowing. When the flue gas temperature was 1000 degrees C or 1150 degrees C, there was much phosphate complex salt as the skeleton in the ash deposits of the mixed coal, such as Na2CaMg7(PO4)(6). Phosphate captured Na and Ca, and effectively inhibited the low temperature eutectic mixtures of Ca with Si and Al, indicating that phosphorus-based additive had good effect on improving ash deposition characteristics of Zhundong coal.

关键词： Zhundong coal Phosphorus-based additive DTF Ash deposition FactSage

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Spray drop measurements using depth from defocus

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MEASUREMENT SCIENCE AND TECHNOLOGY 2020年第7期31卷

作者： Zhou Wu Tropea, Cameron Chen Benting Zhang Yukun Luo Xu Cai Xiaoshu Univ Shanghai Sci & Technol Sch Energy & Power Engn Jungong Rd 516 Shanghai 200093 Peoples R China Tech Univ Darmstadt Inst Fluid Mech & Aerodynam Alarich Weiss Str 10 D-64287 Darmstadt Germany Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Jungong Rd 516 Shanghai 200093 Peoples R China

Sprays are typically characterised by providing local drop size and velocity distributions and number density. The present work examines the possibility of obtaining such information using backlight photography, whereby two cameras are employed and the size and position of each imaged drop is obtained using a depth from defocus approach. A simple algorithm for estimating size and position from the two camera images is introduced and the sensitivity of this algorithm to various system parameters is investigated with simulations using synthetic images, measurements from a calibration facility, and measurements conducted in a sparse spray. Comparison measurements using the analysis of focused images are provided.

关键词： depth from defocus (DFD) two-camera imaging system spray sizing

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Theoretical Analysis on the Lifetime of Sessile Droplet Evaporation

Theoretical Analysis on the Lifetime of Sessile Droplet Evap...

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作者： Shen, Yang Cheng, Yongpan Xu, Jinliang Zhang, Kai Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy North China Electric Power University Beijing102206 China School of Energy Power & Mechanical Engineering North China Electric Power University Beijing102206 China

There are two stages for a sessile droplet evaporation on the solid substrate, one is the "constant contact radius" (CR) mode, the other is the "constant contact angle" (CA) mode. In this paper, the theoretical model is built up for sessile droplet evaporation for the two modes, the lifetime of evaporating droplet is obtained under different initial contact radius, initial contact angle and critical contact angle for mode transition. It is found that in the CR mode, the variation of initial contact angle is nonlinear with the time. For both CR and CA modes the lifetime is proportional to R02 (R0 is the initial contact radius of droplet) for two modes. When the critical contact angle for mode transition from CR to CA is increased, the lifetime for CR mode is decreased while the lifetime for CA mode is increased, and the overall lifetime is also increased. This result may be of great significance for sessile droplet evaporation. © Springer Nature Switzerland AG 2020.

关键词： Evaporation

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Navigating the Dual Pathways of Ion Removal in flow-Electrode Capacitive Deionization: Capacitive Trapping vs. Electrodialytic Migration

SSRN

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SSRN 2025年

作者： Gu, Haibo Hou, Chengsi Mao, Yunfeng Wu, Deli School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai200093 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

By introducing flowing electrodes, FCDI enables desalination through dual mechanisms of electrodialytic and capacitive effects. Clarifying their distinct roles is essential to advance tailored system design and performance enhancement. This work elucidates the antagonistic interplay between capacitive trapping and electrodialytic migration in flow-electrode capacitive deionization (FCDI) through both electrochemical characterization and multiphysics modeling. Experimental analyses reveal that elevated flow rates enhance electrodialytic migration but impair capacitive adsorption. Multivariate parametric studies demonstrate that capacitive dominance prevails at high current densities and low electrolyte concentrations, whereas electrodialytic effects peak under high electrolyte concentration and moderate flow rates. The balance between the effects of electrodialysis (ED) and capacitive deionization (CDI) is greatly impacted by convective mass transfer, which is caused by the electrode flow rate. While higher solid weight percentages in the flow electrode improve the CDI effect by increasing the number of active sites for salt adsorption, increased electrode flow rates maximize the ED effect by encouraging ion transport in the electrolyte. In short words, strategies to promote free ions dispersing in the electrolyte would enhance the electrodialytic contribution, whereas the concentration polarization would benefit the capacitive contribution. This work opens the door for the exploration of upgrading FCDI architectures and optimizing operation parameters while providing insights into the intricate interactions within the system. © 2025, The Authors. All rights reserved.

关键词： Desalination

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Co-pyrolysis characteristics of sludge mixed with Zhundong coal and sulphur contaminant release regularity

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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2019年第2期138卷 1623-1632页

作者： Zhao, Bing Jin, Jing Li, Shang Liu, Dunyu Zhang, Ruipu Yang, Haoran Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai Peoples R China

In this work, the pyrolysis characteristics and release of sulphur contaminant were studied under different mass percentages (25%, 50% and 75%) of Zhundong coal in the sample mixtures. The results showed that the yields of volatile products during co-pyrolysis were higher than those calculated from linear combination of corresponding yields of pure sludge and Zhundong coal, which mean that a certain synergistic effect occurs in co-pyrolysis process. The yields of H2S, COS and SO2 decreased with the increase in the content of Zhundong coal in the samples. What's more, when the content of Zhundong coal were 50%, a great significance on the yields of sulphur contaminant occurs in the process of co-pyrolysis.

关键词： Sludge Zhundong coal Co-pyrolysis Sulphur contaminant

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Selective catalytic reduction of NOx with NH3 over cerium-tungsten-titanium mixed oxide catalyst: Synergistic promotional effect of H2O2 and Ce⁴⁺

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JOURNAL OF MATERIALS RESEARCH 2020年第16期35卷 2218-2229页

作者： Xiong, Zhi-bo Qu, Xiao-ke Du, Yan-ping Li, Cheng-xu Liu, Jing Lu, Wei Wu, Shui-mu Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Shanghai Jiao Tong Univ China UK Low Carbon Coll Shanghai 200240 Peoples R China SPIC Powder Plant Operat Technol Beijing Co Ltd Beijing 102209 Peoples R China

A highly active catalyst of cerium-tungsten-titanium mixed oxide was synthesized by introducing Ce4+ and H2O2 in the base sample of Ce20W10Ti100Oz-Ce3+. As a consequence, the NH3-SCR activity of Ce20W10Ti100Oz-Ce3+ is significantly improved as the additives of Ce4+ and H2O2 enlarge the Brunauer-Emmett-Teller (BET) surface area by refining its pore size. Meanwhile, the introduction of Ce4+ increases the Lewis acid sites of Ce20W10Ti100Oz-Ce3+ and decreases its low-temperature BrOnsted acid sites. The further addition of H2O2 improves the BrOnsted acid sites and dispersion of cerium/tungsten species, and thereby enhances the concentrations of the adsorbed oxygen (O-alpha) and the adsorbed oxygen due to the activation of chemisorbed water on the surface of the catalyst. The addition of Ce4+ and H2O2 shows a synergistic promotional effect, which is due to the largest BET surface area and the highest concentrations of O-alpha or/and . Ce20W10Ti100Oz-Ce3+:Ce4+ = 17.5:2.5 + H2O2 exhibits the highest catalytic activity compared with the conventional ones (Fig. 5).

关键词： NOx reduction selective catalytic reduction cerium-tungsten-titanium mixed oxide synergistic promotional effect H2O2

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Numerical Simulation of Acoustic Propagation in Gas Ultrasonic flowmeter

SSRN

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SSRN 2022年

作者： Xiao, Yongqing Zhang, Meng Li, Dong Yang, Yueming Ma, Bingkun Qi, Jianhui School of Energy and Power Engineering Shandong University Jinan250061 China Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power University Beijing102206 China Suzhou Research Institute Shandong University Suzhou215123 China Shandon Academy of Sciences China

Ultrasonic flowmeter has been widely used in chemical smelting, industrial production and other fields. Through the COMSOL Multiphysics software, the non-linear trajectory of the rays in the non-invasive and intrusive UFW is first simulated by the ray tracing method. Then, the transient ultrasonic propagation process is simulated to analyze the reasons for the error of ultrasonic propagation. Finally, the cause of the error of the transducer is analyzed by the sound pressure signal at the receiving end. It was found that it is precisely because of the high-speed flow that the ultrasonic propagation is distorted, which is manifested as the non-linear trajectory and downstream drift of the sound beam. The signal at the receiving end also fails to hit the correct position due to beam drift, resulting in sound pressure falling below the detected value. © 2022, The Authors. All rights reserved.

关键词： flow measurement

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