Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
Not a member yet
23976 research outputs found
Sort by
Enhanced passivation of thallium, vanadium and arsenic in contaminated soils: critical role of Fe-Mn-biochar
No full textThallium (Tl), vanadium (V) and arsenic (As) are considered as typical toxic elements of increased interest. Their accumulation in soils can pose a substantial health threat to human beings. In this study, Fe-Mn modified biochar (FMBC) was chemically constructed to immobilize Tl, V and As in contaminated soils. The results showed that compared with pristine biochar (BC), FMBC can achieve significantly higher passivation effects for the studied contaminated soils, which reduced the bioavailable Tl, V and As contents by 83.9%, 71.09% and 71.92%, respectively. The passivation of Tl, As, and V via FMBC application was partially attributed to a notable increase in pH, which enhances the availability of adsorptive sites. Further, the newly formed minerals, including cancrinite, gibbsite and Fe-Mn (hydr)oxides, serve as additional adsorbents, substantially reducing the mobility of Tl, V and As. Additionally, the oxidation of Tl(I) to Tl(III) by the Fe-Mn (hydr)oxide of FMBC significantly enhanced Tl immobilization, consequently diminishing its bioavailability. The findings suggest that significant environmental threats could be alleviated through the potential application of FMBC in treating Tl-As-V dominated contamination in soils, providing a new perspective for the sustainable utilization of industrially polluted soils.
FMBC effectively reduced the bioavailability of Tl, As and V in contaminated soils. Formation of new minerals during passivation can enhance adsorption of the studied elements. Effective immobilization of Tl may be mainly ascribed to oxidation of Tl(I) to Tl(III) by FMBC
Super-long gravity heat pipe geothermal space heating system: A practical case in Taiyuan, China
No full textUsing super-long gravity heat pipes (SLGHPs) to exploit deep-earth geothermal energy has indicated its technical superiority and viability; yet there is no practical application so far. The present work reports an SLGHP geothermal space heating system constructed in Taiyuan, China, which has two SLGHPs (2020 m and 2180 m long, respectively) in combination with a single heat pump. The two wells are located only -30 m apart, and the well-log temperature at 2000 m depth is around 63 degrees C for both. Temperatures measured by the optical fiber arranged along the SLGHP outer wall show remarkable uniformity, indicating the good performance of SLGHPs. Testing with the SLGHP system finds that the slightly longer SLGHP extracts 70 % more heat than the other one. Analyses reveal that the heat transfer in the geothermal formations surrounding the shorter SLGHP approximately follows the heat conduction regime while the convection of groundwater contributes less; the high yield of the slightly longer SLGHP is due to an interesting downhole heat transfer enhancement mechanism arising from the interlayer crossflow of groundwater. Further, a numerical model is developed to predict the SLGHP geothermal system's performance in 120-days' operation. It is found that this system can output 1 MW of heat, sufficing space heating of -25,000 m2 buildings. The simulated 20-years' operation indicates the thermal output degradation is 20.4 % for the shorter SLGHP, whereas it is only 6.8 % for the slightly longer SLGHP; the downhole groundwater crossflow lowers the SLGHP system degradation rate
Promotion mechanism of carbon dioxide hydrate formation by L-Methionine and its competitive effects with NaCl
No full textThe growth kinetics and macroscopic morphology evolution of CO2 hydrate promoted by L-Methionine (L-Met) in NaCl aqueous solutions in a wide range of mass fractions were systematically investigated. 0.05 wt% was the threshold mass fraction of L-Met to have prominent promotion effects in a batch mode. The addition of NaCl could suppress its promotion performance, while it could be regained by further addition of L-Met to 1.0 wt%. Porous feature and wall-climbing phenomena of CO2 hydrate were obvious in the presence of L-Met while it could be suppressed by NaCl. The tangential (lateral) growth rate of the hydrate film on planar pure water surface was the highest while both L-Met and NaCl could decrease it. For L-Met, it was the highest at 0.05 wt%. Special balllike, mosaic-like and sword-like appearances of CO2 hydrates were found. Both the adsorption-capillary effects of L-Met and the hydration effects of L-Met and NaCl were thought to account for all the phenomena and a detailed scenario was proposed and discussed. A macroscopic growth model based on the tangential growth rates of hydrate films was proposed and evaluated
PI project of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML20230921]
No full textScalable Fabrication Methods of Large-Area (n-<i>i</i>-p) Perovskite Solar Panels
No full textOrganometal halide perovskite photovoltaic (PV) cells have achieved power conversion efficiencies (PCEs) comparable to the leading crystalline silicon (c-Si) PV technology. However, despite their exceptional performance, these perovskite solar cells (PSCs) face technological challenges such as large-area fabrication complexities and outdoor stability concerns. These challenges need to be addressed to pave the way for the commercialization of PSCs. The key to commercializing PSCs lies in developing stable, large-area solar modules that offer both high efficiency and reliability. Overcoming the hurdles of large-area module design and fabrication is a crucial step, and researchers are exploring innovative solutions to tackle these challenges. This review article primarily focuses on the development of large-area PSCs, recent advancements in this field, and the obstacles related to scaling up this technology. It delves into the techniques used to fabricate perovskite films, with a special emphasis on large-area and large-scale PSC manufacturing methods. Moreover, the review highlights stability concerns that perovskite solar modules (PSMs) face and reports on recent progress in addressing these issues. The article concludes by summarizing potential future research directions aimed at realizing the full commercial potential of this innovative and promising solar cell technology
Multi-objective optimization of efficient liquid cooling-based battery thermal management system using hybrid manifold channels
No full textMaintaining a battery cell at an optimal temperature improves both its performance and lifespan. This study proposes a cold plate equipped with hybrid manifold channels, positioned at the bottom of a high -capacity 280 Ah LiFeO 4 battery pack. Based on the developed whole battery pack model, the response surface method elucidates the functional relationship between design parameters (i.e., the width of parallel channels, the width of manifold channels, the height of parallel channels, and the inlet velocity) and responses (i.e., the flow pressure drop, the temperature difference of the entire battery modules, and the temperature difference of the cold plate). Multi -objective optimization of design parameters is performed to search the Pareto front to maximize thermal performance and minimize flow pressure drop, employing the NSGA-II algorithm. Results reveal that the maximum battery temperature can be limited to 30.73 - 33.78 degrees C with a coolant pressure drop ranging from 7.66 kPa to 1.76 kPa, at a heating power of 10 kW/m 3 for the battery cell. The optimal design configuration, identified through TOPSIS, limits the maximum battery temperature to an acceptable temperature of 45 degrees C at a discharging rate of 3C, with a pressure drop below 4.2 kPa. Compared to the 280 Ah LiFeO 4 battery with natural air cooling and forced flow immersion cooling systems, the maximum battery temperature with a discharging rate of 1C is reduced by 17.6 degrees C and 11.7 degrees C, respectively
Comparative investigation on composting and pyrolysis of swine manure: Heavy metals transformation, nitrogen immobilization and integrated environmental risk assessment
No full textHarmless treatment of livestock manure has been a pressing issue due to its contamination of heavy metals and volatilization of nitrogen(N)-containing components during processing. In this paper, the chemical species transformation, leaching characteristics of Cr, Mn, Zn, Cu and conversion of amine N and inorganic N during composting and pyrolysis of swine manure (400 degrees C, 500 degrees C, 600 degrees C and 700 degrees C) were comparatively investigated, and their integrated environmental risk ( eta) was assessed. According to the ultimate and proximate analysis, pyrolyzed char exhibited better aromaticity and richer functional groups compared with that of compost; Cr, Mn, Zn, Cu were transformed into more stable residual states (F3+F4), and better inhibition of leaching in simulated landfill experiments was shown than compost. However, deamination and cyclocondensation reactions under higher pyrolysis temperatures resulted in N escaping in the form of NH 3 and HCN. Considering various pollution coefficients, the integrated ecological risk was reduced by 59.24 % after 600 degrees C pyrolysis, which is the optimal condition for the minimization of the risk of heavy metal toxicity and N volatilization among all the compost and pyrolysis process
Access Repository Dashboard
Do you manage Institutional Repository of GuangZhou Institute of Energy Conversion, CAS? Access insider analytics, issue reports and manage access to outputs from your repository in the CORE Repository Dashboard!