Article
Engineering, Environmental
Edilton N. Silva, Melina Cantillo-Castrillon, Thiago M. Dantas, Yuri M. Mesquita, Debora A. S. Maia, Moises Bastos-Neto, William M. Barcellos, Diana C. S. Azevedo
Summary: This study focused on synthesizing an alternative adsorbent for siloxane adsorption using residual sand from a WWT plant, showing improved silicon content and adequate porosity. The adsorption performance of the new adsorbent was comparable if not superior to commercial silicas, especially at low adsorbate concentrations. These results demonstrate the potential of residual sand from WWT as a suitable raw material for producing an efficient adsorbent for removing cyclic siloxanes from biogas.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Takuma Misawa, Tomoaki Ishikawa, Satoshi Takeya, Saman Alavi, Ryo Ohmura
Summary: CO2 separation from H2 + CO2 gas mixture is essential for stable supply of blue hydrogen, and hydrate-based CO2 separation is a superior technology in terms of environmental and economic aspects. The study showed successful CO2 separation in the H2 + CO2 + CP + H2O system at 284 K, but with an increase in energy costs due to hydrogen loss.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Engineering, Environmental
Yue Zhang, Ruikai Zhao, Xianhua Nie, Shuai Deng, Weicong Xu, Yu Zhu, Li Zhao
Summary: The composition-adjustable organic Rankine cycle (ORC) can improve energy efficiency by regulating the composition of the working fluid. In this study, a hydrate-based composition regulation technique was proposed and experimentally investigated using R22/R125 mixtures. Stirring was found to enhance the initial hydrate formation rate, and a higher fraction of R22 in the feed gas led to faster initial hydrate formation. Components were observed to partition between the gas and hydrate phases, with R22 dominating the early stage of hydrate formation and R125 becoming more enclathrated at the later stage. By implementing proper formation time and temperature ramping down mode, the separation performance of the ORC system was significantly enhanced.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Hyunglok Chu, Kyuchul Shin
Summary: Xenon (Xe) and krypton (Kr) are used in various important industries, but their separation is energy-intensive. This study shows that clathrate hydrates can be used for cost-effective Xe-Kr separation. The hydrate-based approach captures Xe selectively and requires milder temperature conditions compared to cryogenic distillation. It suggests that this method is an excellent alternative to the energy-intensive cryogenic distillation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Thermodynamics
Xi Lai, Li Zhao, Xianhua Nie, Yue Zhang, Qi Zhang
Summary: This study experimentally investigated the hydrate-based composition regulation of a mixed working fluid with both environmental and excellent thermodynamic properties. The separation characteristics of the mixed working fluid were clarified, and the optimal separation operating conditions were analyzed. The study found that this hydrate-based composition regulation method can achieve precise regulation with a change in composition in a short period of time, and lower temperatures and higher pressures can improve the separation performance.
Article
Chemistry, Physical
Hailun Yang, Ling Yuan, Menglei Yuan, Pengge Ning
Summary: In this study, the surface of silica gel was functionalized with 1,2-ethylenediamine for the separation of Co(II) and Ni(II). The modified silica exhibited an 80.2% removal efficiency for Co(II) and a 4-fold improvement in the separation factor. Computational calculations and simulations revealed the binding characteristics of ethylenediamine modified silica gel (en/SG) with M2+ (M-Co, Ni) in aqueous solution. The results showed that Co(II) had stronger binding ability to ethylenediamine and that en/SG preferred to bind with Co(II) due to its more negative Gibbs free energy in aqueous solution. The difference in complexation ability between Ni, Co, and ethylenediamine enhanced the separation performance.
Article
Chemistry, Physical
Zhikai Liang, Xiaobing Lan, Jun Chen, Jianjian Wu, Bin Deng
Summary: Heavy metal ions in waste water can be potentially treated by hydrate formation and dissociation. This study investigated the removal of nickel chloride as a heavy metal solution using methane hydrate. Factors such as stirring speed, hydration time, temperature, and concentration were considered. The study found that adherence of heavy metal solution on the hydrate surface and accumulation of wrapped heavy metal solution were the main reasons for impurity in heavy metal removal. A flushing water method was proposed to improve the removal efficiency. The study also suggested controlling hydrate formation conditions and combining hydrate-based method with other methods to enhance heavy metal removal efficiency.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Environmental
Chanjuan Liu, Zhen Long, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study investigates the growth and storage performance of CO2 hydrates under different conditions, and finds that the water film on silica gel particles is the main factor affecting gas storage efficiency. Silica gels with 30% water saturation can achieve the highest CO2 storage capacity. In addition, it is found that SDS can increase the CO2 storage volume ratio under high water saturation and reduce the volume ratio decay in repeated tests.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Hideo Maruyama, Hideshi Seki, Akito Furukawa
Summary: The adsorption behavior of methyl palmitate on a silica surface in the presence of methanol and toluene was studied, and an adsorption model based on Langmuir type adsorption was proposed. The experimental data matched well with the proposed model, and the equilibrium adsorption constant K correlated with the dielectric constant of each substance. The adsorption parameters were experimentally verified under different conditions.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Energy & Fuels
Erfan Khanmohammadian, Mohsen Mohammadi, Rohallah Hashemi, Sina Eslami, Mohammad Reza Ehsani
Summary: In this study, the separation of CO2 gas from a CO2/CH4 mixture was investigated using the gas hydrate formation method. Silica and APTES surface-modified silica nanoparticles with potassium hydroxide were used as additives. The presence of silica improved gas consumption, separation factor, and recovery factor. The optimal nanofluids with silica and potassium hydroxide showed a significant increase in gas consumption, separation factor, and recovery factor compared to pure water. The gas-liquid ratio and initial pressure affected the gas consumption, separation, and recovery factors.
Article
Thermodynamics
Saeid Sinehbaghizadeh, Agus Saptoro, Sepideh Amjad-Iranagh, Amir H. Mohammadi
Summary: This study investigates the influence of different biogas compositions on clathrate hydrate formation and proposes a kinetic model for predicting the progress of biogas crystal growth. The results indicate that the concentration of dissolved gas in liquid water is a key factor in the growth rate, with H2S and SO2 molecules slightly promoting biogas hydrate formation and N2 and H2 molecules reducing the generation rate of biogas hydrate.
Article
Thermodynamics
Xiaoya Zang, Jing Wang, Yong He, Xuebing Zhou, Deqing Liang
Summary: This study examined the formation kinetics of ternary gas mixture hydrates using synthesized cyclopentane and sodium dodecyl sulfate as additives. The results showed that the use of mixed additives can promote hydrate formation and enhance gas separation under specific conditions. Increasing the concentration of sodium dodecyl sulfate can smoothen the hydrate crystal surface, resulting in more complete crystallization.
Article
Polymer Science
Linghan Li, Tianci Xu, Faping Zhang, Chunhua Du, Song He
Summary: Using silica as the precursor, a super-flexible hydrophobic lipophilic gel solid was prepared via hydrolysis, drying, solvent replacement, and atmospheric-pressure drying. It was found that the gel had good flexibility, hydrophobicity, an amorphous structure, and a hydrophobic contact angle of 137°. The adsorption separation rate of the gel to oil substances was found to be related to the viscosity of the oil substances. The hydrophobic and oleophilic properties of flexible silicon aerogel materials have broad future development prospects and great research significance, especially in crude oil leakage and kitchen waste oil recovery.
Article
Chemistry, Physical
Merve Dogan Ozcan, Ayse Nilgun Akin
Summary: This study investigates the effects of silica on magnesium aluminum silicate supported NiCe based catalysts for syngas production through oxy-steam reforming of biogas. The addition of silica increases Ni crystallite sizes and decreases carbon deposition. NiCe/MgAlSi with Si/Al = 5 exhibits high conversions of CH4 (91.7%), CO2 (80.4%), and H2/CO ratio of 1.6 without carbon deposition and good stability for 120 h at 800°C.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Gang Xu, Chun-Gang Xu, Min Wang, Jing Cai, Zhao-Yang Chen, Xiao-Sen Li
Summary: The study demonstrated that using nickel foam can increase the gas consumption rate and separation efficiency of hydrate-based CO2 separation, while also contributing to the stability of hydrogen in the hydrate phase.
Article
Thermodynamics
Yong Cheng, Fukai Song, Lei Fu, Saishuai Dai, Zhiming Yuan, Atilla Incecik
Summary: This paper investigates the accessibility of wave energy absorption by a dual-pontoon floating breakwater integrated with hybrid-type wave energy converters (WECs) and proposes a hydraulic-pneumatic complementary energy extraction method. The performance of the system is validated through experiments and comparative analysis.
Article
Thermodynamics
Jing Gao, Chao Wang, Zhanwu Wang, Jin Lin, Runkai Zhang, Xin Wu, Guangyin Xu, Zhenfeng Wang
Summary: This study aims to establish a new integrated method for biomass cogeneration project site selection, with a focus on the application of the model in Henan Province. By integrating Geographic Information System and Multiple Criterion Decision Making methods, the study conducts site selection in two stages, providing a theoretical reference for the construction of biomass cogeneration projects.
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The current study presents a hybrid small modular nuclear reactor and solar-based system for sustainable communities, integrating floating and bifacial photovoltaic arrays with a small modular reactor. The system efficiently generates power, hydrogen, ammonia, freshwater, and heat for residential, agricultural, and aquaculture facilities. Thermodynamic analysis shows high energy and exergy efficiencies, as well as large-scale ammonia production meeting the needs of metropolitan areas. The hybridization of nuclear and solar technologies offers advantages of reliability, environmental friendliness, and cost efficiency compared to renewable-alone and fossil-based systems.
Editorial Material
Thermodynamics
Wojciech Stanek, Wojciech Adamczyk
Article
Thermodynamics
Desheng Xu, Yanfeng Li, Tianmei Du, Hua Zhong, Youbo Huang, Lei Li, Xiangling Duanmu
Summary: This study investigates the optimization of hybrid mechanical-natural ventilation for smoke control in complex metro stations. The results show that atrium fires are more significantly impacted by outdoor temperature variations compared to concourse/platform fires. The gathered high-temperature smoke inside the atrium can reach up to 900 K under a 5 MW train fire energy release. The findings provide crucial engineering insights into integrating weather data and adaptable ventilation protocols for smoke prevention/mitigation.
Article
Thermodynamics
Da Guo, Heping Xie, Mingzhong Gao, Jianan Li, Zhiqiang He, Ling Chen, Cong Li, Le Zhao, Dingming Wang, Yiwei Zhang, Xin Fang, Guikang Liu, Zhongya Zhou, Lin Dai
Summary: This study proposes a new in-situ pressure-preserved coring tool and elaborates its pressure-preserving mechanism. The experimental and field test results demonstrate that this tool has a high pressure-preservation capability and can maintain a stable pressure in deep wells. This study provides a theoretical framework and design standards for the development of similar technologies.
Article
Thermodynamics
Aolin Lai, Qunwei Wang
Summary: This study assesses the impact of China's de-capacity policy on renewable energy development efficiency (REDE) using the Global-MSBM model and the difference-in-differences method. The findings indicate that the policy significantly enhances REDE, promoting technological advancements and marketization. Moreover, regions with stricter environmental regulations experience a higher impact.
Article
Thermodynamics
Mostafa Ghasemi, Hegazy Rezk
Summary: This study utilizes fuzzy modeling and optimization to enhance the performance of microbial fuel cells (MFCs). By simulating and analyzing experimental data sets, the ideal parameter values for increasing power density, COD elimination, and coulombic efficiency were determined. The results demonstrate that the fuzzy model and optimization methods can significantly improve the performance of MFCs.
Article
Thermodynamics
Zhang Ruan, Lianzhong Huang, Kai Wang, Ranqi Ma, Zhongyi Wang, Rui Zhang, Haoyang Zhao, Cong Wang
Summary: This paper proposes a grey box model for fuel consumption prediction of wing-diesel hybrid vessels based on feature construction. By using both parallel and series grey box modeling methods and six machine learning algorithms, twelve combinations of prediction models are established. A feature construction method based on the aerodynamic performance of the wing and the energy relationship of the hybrid system is introduced. The best combination is obtained by considering the root mean square error, and it shows improved accuracy compared to the white box model. The proposed grey box model can accurately predict the daily fuel consumption of wing-diesel hybrid vessels, contributing to operational optimization and the greenization and decarbonization of the shipping industry.
Article
Thermodynamics
Huayi Chang, Nico Heerink, Junbiao Zhang, Ke He
Summary: This study examines the interaction between off-farm employment decisions between couples and household clean energy consumption in rural China, and finds that two-paycheck households are more likely to consume clean energy. The off-farm employment of women is a key factor driving household clean energy consumption to a higher level, with wage-employed wives having a stronger influence on these decisions than self-employed ones.
Article
Thermodynamics
Hanguan Wen, Xiufeng Liu, Ming Yang, Bo Lei, Xu Cheng, Zhe Chen
Summary: Demand-side management is crucial to smart energy systems. This paper proposes a data-driven approach to understand the relationship between energy consumption patterns and household characteristics for better DSM services. The proposed method uses a clustering algorithm to generate optimal customer groups for DSM and a deep learning model for training. The model can predict the possibility of DSM membership for a given household. The results demonstrate the usefulness of weekly energy consumption data and household socio-demographic information for distinguishing consumer groups and the potential for targeted DSM strategies.
Article
Thermodynamics
Xinglan Hou, Xiuping Zhong, Shuaishuai Nie, Yafei Wang, Guigang Tu, Yingrui Ma, Kunyan Liu, Chen Chen
Summary: This study explores the feasibility of utilizing a multi-level horizontal branch well heat recovery system in the Qiabuqia geothermal field. The research systematically investigates the effects of various engineering parameters on production temperature, establishes mathematical models to describe their relationships, and evaluates the economic viability of the system. The findings demonstrate the significant economic feasibility of the multi-level branch well system.
Article
Thermodynamics
Longxin Zhang, Songtao Wang, Site Hu
Summary: This investigation reveals the influence of tip leakage flow on the modern transonic rotor and finds that the increase of tip clearance size leads to a decline in rotor performance. However, an optimal tip clearance size can extend the rotor's stall margin.
Article
Thermodynamics
Kristian Gjoka, Behzad Rismanchi, Robert H. Crawford
Summary: This paper proposes a framework for assessing the performance of 5GDHC systems and demonstrates it through a case study in a university campus in Melbourne, Australia. The results show that 5GDHC systems are a cost-effective and environmentally viable solution in mild climates, and their successful implementation in Australia can create new market opportunities and potential adoption in other countries with similar climatic conditions.
Article
Thermodynamics
Jianwei Li, Guotai Wang, Panpan Yang, Yongshuang Wen, Leian Zhang, Rujun Song, Chengwei Hou
Summary: This study proposes an orientation-adaptive electromagnetic energy harvester by introducing a rotatable bluff body, which allows for self-regulation to cater for changing wind flow direction. Experimental results show that the output power of the energy harvester can be greatly enhanced with increased rotatory inertia of the rotating bluff body, providing a promising solution for harnessing wind-induced vibration energy.