Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Characteristics of photothermal transfer and biochemical reaction in up-flow direct absorption hydrogen reactor with embedded ribs
No full textThe anaerobic fermentation process of microbial community is a promising method to treat wastewater with high ammonia nitrogen, but it needs to provide suitable temperature. An innovative direct absorption anaerobic reactor was established to reduce the temperature fluctuation of biogas slurry by adding ribs to ensure the high efficiency and stability of anaerobic fermentation process. The effects of flow rate and number of ribs on gas production in the process of photothermal conversion and anaerobic fermentation were analyzed by numerical simulation. The results show that the addition of ribs can effectively reduce temperature fluctuation and increase gas production. Compared with 2269.7 mL/L gas production and temperature fluctuation of up to 8 K without ribs, the gas production increased by 863.1 mL/L and decreased to 0.1624 K when the number of ribs was 9, respectively. Simultaneously, a curve was fitted according to gas production to predict the best working conditions.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved
Chemical recycling of plastic wastes via homogeneous catalysis: A review
No full textImproper disposal of plastic wastes causes serious negative impacts on the ecosystem. These plastic wastes are considered to be a rich carbon resource, and the use of homogeneous catalytic chemical recycling methods has enabled the high-value recovery of plastic wastes under mild conditions to obtain liquid fuels (alkane, cycloalkane and aromatic hydrocarbon etc.), high-value chemicals (terephthalic acid, bisphenol A and diols), and plastic monomers (bis(hydroxyalkyl) terephthalate). This review summarizes recent advances in homogeneous catalysis of plastic polymers for the preparation of high-value chemicals. The bond breaking mechanism of plastics using different homogeneous catalysts and the relationship between catalyst active sites and catalytic performance are systematically discussed in each section. Finally, we evaluate the current homogeneous catalytic chemical recycling routes for plastic wastes. Chemical recycling through homogeneous catalysis is a bright way to realize the circular economy of plastic wastes
Heat collection characteristics of nanofluids in direct absorption solar collector with built-in rotors
No full textAs for the uneven heating of the working medium in direct absorption solar collector (DASC),this paper proposed the method of optimizing the flow pattern in DASC by inserting combined rotors into the collector tube to improve the heat collection performance. The working medium used in this paper is Chinese ink nanofluid. The heat collection performance of the collector was studied, and the enhanced mechanism was explained through simulations. Results demonstrated that inserting rotors improved the temperature rise rate in the circuit, and the temperature of the medium after inserting rotors increased by about 56 % compared with that before inserting rotors when the mass fraction of nanoparticles was 0.2 %. In some cases, a small number of rotors can achieve an enhancement effect similar to that of enormous rotors, and improve the economic performance of the system. The numerical simulation results showed that the high-temperature medium in the plain tube is concentrated near the light side, while the medium in the centre and backlight side of the tube cannot easily absorb solar radiation. After rotors were inserted into the tube, the back-side and light-side media were displaced and mixed by the turbulence of rotors, which can improve heat collection
Special Project for Marine Economy Development of Guangdong (six marine industries)[2019BT02L278]
No full textMulti-layer transparent electrodes for high performance bifacial perovskite solar cells
No full textBifacial perovskite solar cells have gained significant interest due to their high light-harvesting capabilities. In this study, a multilayer transparent conducting film (MLTCF) composed of indium tin oxide (ITO)/2,9-dimethyl4,7-diphenyl-1,10-phenanthroline (BCP)/Ag/ITO is developed as a top electrode for bifacial perovskite solar cells (PSCs). By applying BCP at the bottom of the ITO layer as an adhesion promoter, the Volmer-Weber mechanism of island growth pattern for Ag under thickness threshold conditions is successfully suppressed. This results in ultra-thin (8 nm) and ultra-smooth Ag films with a relatively low sheet resistance of 5.5 omega/sq and high transmittance of 85.8 % at a typical wavelength of 550 nm. Furthermore, a molybdenum oxide (MoO3) overlayer is evaporated onto the soft organic charge transport layer as a protective buffer to prevent sputtering damage during the deposition of ITO and Ag films. Consequently, bifacial PSCs exhibit an optimized power conversion efficiency (PCE) of 20.3% for single-side illumination from the glass side, and equivalent PCEs of 23.6 %, 25.2 %, 26.8 % with albedo of 0.2, 0.3 and 0.4, respectively. This work paves the way for the development of highly efficient bifacial thin-film solar cells
Upcycling of aureomycin hydrochloride residue into highly meso-microporous carbon with remarkable adsorption capacity for benzene capture
No full textThe exploration of high-value utilization of antibiotic bacteria residues is of great importance at the environmental and resource levels. In this study, we report an aureomycin hydrochloride residue-derived activated carbon and its application in the adsorption of hazardous benzene. Self-N-doped activated carbon with excellent benzene adsorption properties was prepared by K2CO3-assisted activation pyrolysis using aureomycin hydrochloride residue as carbon and nitrogen sources. It is found that the pore structure and the benzene adsorption behavior could be optimized through regulating the mass ratio of K2CO3 to carbon (mK2CO3/mC) and the activation temperature. Under the pyrolysis conditions of mK2CO3/mC = 3:1 and 800 degrees C, the specific surface area and total pore volume of the as-prepared carbon reached 1564 m2 g-1 and 0.70 cm3 g-1, respectively, whereas those of the micropores were 1440 m2 g-1 and 0.48 cm3 g-1, respectively, implying that the proportion of micropores reached 68.6%. The adsorption capacity of benzene based on the optimal adsorbent (AHRC-3PC-800) was as high as 1303 mg g-1 at 25 degrees C and relative pressure (P/P0) of 0.9-1. Therefore, the aureomycin hydrochloride residuebased activated carbon adsorbent has a broad application prospect in the removal of volatile organic compounds
Study of the blocking mechanism in gravel packing based on CFD-DEM
No full textGravel packing sand control (GPSC), as the optimization of mechanical sand control technology, is widely used in the deep water completion and sand control of loose sandstone heavy oil reservoirs and highly argillaceous. To explore the blocking mechanism of GPSC, the influence of its structural parameters on the blocking of GPSC is investigated. This paper establishes a particle element model based on computational fluid dynamics-discrete element method coupling using the discrete element method and establishes a fluid flow model combined with computational fluid dynamics to realize their full coupling solution. And sand control experiments were carried out using a micro visual sand control simulation device to verify the blocking model. The blocking mechanism is analyzed from the microscopic point of view, and then, the influence of sand control structure parameters on the blocking in GPSC design is evaluated. The results show the following: (1) the blocking process of GPSC can be divided into three stages: an initial stage, sand accumulation stage, and equilibrium stage. (2) There are two main types of gravel packing blockage. The first type of blocking is blocking on the surface of the gravel layer. Sand particles on the surface of gravel layer mainly exist in the form of large particle size blocking gravel pores and sand particles bridging each other. The second type of blockage is the blockage inside the gravel layer. Sand particles mainly exist in the form of internal mud cakes and adsorption on gravels inside the gravel layer. (3) To ensure the sand control performance of the gravel layer, the gravel layer thickness is designed between 23 and 28 mm. The displacement or pressure of the on -site packing pump should be increased to ensure that the gravel layer packing solidity ranges between 59% and 62%. In the design of GPSC, it should be ensured that the median particle size of gravel is 5-6 times the median particle size of sand. This study provides an effective technical reference for the design of gravel structural parameters in on -site gravel packing completion sand control. (c) 2023 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved
Environmentally Friendly Antiagglomerants: A Promising Solution for Gas Hydrate Plugging and Corrosion Risk Management in Oil and Gas Pipelines
No full textGas hydrates pose a serious flow assurance challenge due to their ability to form, agglomerate, and block subsea flowlines on relatively fast time scales, leading to the loss of production and potential safety and environmental risks. The hydrate management strategy based on antiagglomerant inhibitors has gained significant interest in recent years, particularly in long tiebacks, maturing fields, and deep-water projects. However, most of the antiagglomerants used are not environmentally friendly, and compatibility issues with corrosion inhibitors also arise during coinjection operations. Here, a new oleic acid derivative was synthesized and used to develop two formulations (OADs) as green multifunctional flow assurance chemicals to control hydrate agglomeration and corrosion risks inside oil and gas pipelines. The experimental results showed that the OADs effectively inhibited methane hydrate growth and formed a transportable hydrate slurry in a water-paraffin mixture. Moreover, 0.1 wt % OADs completely suppressed the corrosion process of carbon steel in a CO2- and H2S-saturated solution by a protection of 99.4%. Computational studies also revealed that the adsorption of OADs on the hydrate surface increased its hydrophobicity, preventing the hydrate and water droplets from aggregating or clumping together. Additionally, OADs decreased the binding energy of iron and corrosive species up to 99.5%, and corrosive ions were almost no longer in direct contact with iron. The binding energy between the inhibitor and iron indicated the formation of a stable protective film by the OAD molecules on the steel surface to protect it against acidic corrosion. These results contribute to show the potential of oleic acid as a valuable green source to develop dual-purpose antiagglomerant hydrate and corrosion inhibitors for hydrate-related safety management
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