Journal of Energy Storage
·
2024
·
IF 8.9
Yi Fang,Yingjie Li,Youhao Zhang,Yuzhuo Wang,Zirui He,Kuihua Han,Jun Jie Wu
CaO/CaCO 3 energy storage is a promising technology to solve the intermittency of solar energy. Fluidized-bed reactors serve as crucial devices for calcination and carbonation in CaO/CaCO 3 energy storage system . This work presents the first observation of defluidization occurring in CaO/CaCO 3 energy storage process. The mechanism of defluidization was investigated through the exothermic experiment and computational fluid dynamics-discrete element method. Furthermore, the defluidization in the exothermic stage was mitigated by simultaneous nano-silica coating and SiO 2 fines addition. The result indicates that high CO 2 concentration (>80 %), small particle size (0.075–0.18 mm) and low initial bed temperature (700–800 °C) result in the defluidization. The defluidization leads to low exothermic performance of CaO particles and serious uneven temperature distribution in the exothermic stage during CaO/CaCO 3 energy storage process. The simulation result indicates that carbonation proceeding at zero-order kinetics leads to rapid CO 2 absorption in the emulsion phase . The absorption of CO 2 in the emulsion phase surpasses the replenishment of CO 2 from the bubbles, resulting in the contraction of the emulsion phase, which is the cause of defluidization in the exothermic stage. The combination of nano-silica coating for CaO and SiO 2 fines addition enhances the porosity in the emulsion phase, thereby facilitating the diffusion of CO 2 from the bubbles into the emulsion phase. Thus, the defluidization of CaO particles is eliminated by simultaneously coating with 5 wt% nano-silica and adding 3 wt% SiO 2 fines (50–75 μm). After this improvement in fluidization , the bed temperature difference is only 12 % of that in defluidization. Furthermore, the effective conversion of CaO particles increases by 10 % compared with that in defluidization. These findings are helpful for solving the defluidization of CaO particles in CaO/CaCO 3 energy process.
研究领域:
能源存储
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2025
·
IF 10.9
Mingyu Liu,Sheng Chen,Jianhong Fu,Yunhao Huang,Shuang Liu,Wenqiang Liu
Thermochemical energy storage via the calcium-looping process is a highly promising technology for next-generation concentrated solar power systems. However, the development of efficient and stably operated solar-driven chemical reactors remains a significant challenge. This study provides a comprehensive investigation into the energy storage performance of Al/Fe/Mn co-doped CaCO 3 particles in a kilogram-scale, directly irradiated fluidized-bed reactor, systematically evaluating the spatiotemporal temperature distribution, reaction kinetics, and particle degradation mechanisms under varying fluidizing gas velocities. At low flow rates, a fixed-bed state resulted in severe particle sintering and incomplete reaction. Conversely, under fluidized conditions, particle conversion consistently exceeded 90%. However, while excessively high gas velocities further improved temperature uniformity, the associated convective heat loss limited the reaction rate, leading to a substantial increase in the characteristic reaction time. An optimal flow rate of 18 L/min minimized the calcination time to 18.35 min and yielded a peak solar-to-chemical energy conversion efficiency. Particle degradation was found to be governed by a complex interplay between thermal stress-induced fragmentation (dominant at low flow rates) and mechanical attrition (dominant at high flow rates). Furthermore, significant density-induced particle segregation was observed across all flow rates, with denser, unreacted CaCO 3 particles accumulating at the bottom of the bed. This study provides critical insights into the intricate trade-offs between thermal performance, material integrity, and particle dynamics, which are paramount for the rational design and reliable scale-up of solar thermochemical reactors.
研究领域:
能源材料
·
化学工程
·
太阳能利用
·
反应工程
·
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 6
·824
·
IF 4.9
Qi Chen,Na Wang,Dhandapani Kuzhandaivel,Yingxian Chen,Lixin Wu,Longhui Zheng
Wear resistance is the key factor that affects the long-term use of leather. Graphene has excellent wear resistance properties, but ensuring the effective dispersion of graphene in resin is crucial for determining the performance of the material. In this work, silica modified with polydopamine (SiO2@PDA) was used as an exfoliation agent. Using the microfluidization process and water as the medium, silica-graphene hybrid nanoparticles (SiO2@PDA-G) were prepared from expanded graphite. These nanoparticles were further compounded with waterborne polyurethane (WPU), and a superfine fiber-based fabric was used as the substrate to prepare composite coating. The results showed that the high shear force of the microfluidization process easily broke up the lamellar structure of graphite, resulting in few-layer graphene. Nano-silica was adsorbed on the surface of graphene, preventing re-aggregation between the graphene sheets. Compared to the WPU coating, the presence of SiO2@PDA-G improved the wear resistance and mechanical properties of the coating. The wear rate and the average friction coefficient of the composite coating decreased by 48% and 69%, respectively, and the tensile strength increased by 83%. Therefore, this study provides a new strategy for improving the dispersion of graphene in polymer materials and enhancing the abrasion resistance of the coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Bo Lv,Zeya Zhao,Xiaowei Deng,Chaojun Fang,Baolin Xing,Bobing Dong
The removal of copper ions from wastewater is of great significance for reducing pollution of surrounding environments and ensuring the quality of drinking water . In this study, a liquid–solid fluidized bed with nutshell activated carbon was used to adsorb copper ions from wastewater. The fluidization characteristics and adsorption performance of the liquid–solid fluidized bed were investigated through batch, cyclic, and continuous adsorption experiments. The results showed that nutshell activated carbon had a strong adsorption capacity for copper ions in wastewater by the electrostatic adsorption function of its oxygen-containing groups, and the adsorption isotherm was fitted by the Langmuir isotherm model ( R 2 reached 0.98), which indicated a positive single-layer adsorption. The pseudo-second-order model described the adsorption process well, and the adsorption process was controlled by a continuous migration step with internal and external diffusion. The high-frequency contact between adsorbent and adsorbate in the fluidized bed layer increased its external diffusion rate, thereby promoting improved adsorption efficiency of 96% compared with 76% of the packed bed. The weight of the particle bed was the factor influencing adsorption performance the most, followed by fluidization number, and then initial concentration, indicating that the fluidization characteristics determined the adsorption efficiency. The breakthrough curve showed that the adsorption saturations of the fluidized and packed bed were 0.694 and 0.660 g/g, respectively, which demonstrated the superiority of the fluidized bed in the adsorption process.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2021
·
IF 6.609
Hanzi Liu,Yi Zhang,Haiming Wang,Changfu You
Selective non-catalytic reduction of NOx (SNCR) with NH 3 is commonly used in industrial facilities like circulating fluidized bed (CFB) furnaces. However, the strongly temperature-dependent de-NOx feature confines its applications in a specific temperature range (900–1050 °C). Here, we report a new strategy on using Fe-Ni-W exchanged zeolite (0.5FNW-H) as a catalyst to extend the SNCR temperature window. In the CFB reactor, a significant NOx conversion improvement ranging from 14.1% to 80.9% was achieved at 700 to 850 °C by applying the developed catalyst. Catalyst dosage of 4500 h −1 (GHSV), a particle diameter of 0.1–0.3 mm, and NH 3 injection position at the dense-phase zone were found preferred for NOx reduction with the highest efficiency of ~85% at 700 °C. The physicochemical properties of the catalysts remained stable after the circulating reactions in the CFB reactor. The developed catalyst is particularly applicable for improving the SNCR performance when the thermal power plants are operated at low loads.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Food and Bioprocess Technology
·
2022
·Vol. 16
·期 5
·1022-1032
·
IF 5.581
Ke Yingying,Chen Jun,Dai Taotao,Xiao Min,Chen Mingshun,Liang Ruihong,Liu Wei,Liu Chengmei,Du Liqing,Deng Lizhen
Industry-scale microfluidizer system (ISMS) is a novel equipment for producing filtered-free whole beverages. This study investigated the color, nutrition, and flavor changes of whole mango juice (WMJ) treated by ISMS under various pressure (0–120 MPa). Results showed that ISMS well maintained the total soluble solid content, pH value, and yellow color of WMJ. The carotenoids were not destroyed with treatment pressure below 90 MPa, and the carotenoids bioaccessibility of all the WMJ samples was no change. More importantly, ISMS promoted the release of ascorbic acid and total polyphenols by disrupting cellular integrity, thus improving antioxidant activities of WMJ. Volatile compounds analysis found that WMJ samples had more terpenes and aldehydes when treated at 90 MPa, and possessed more esters at 120 MPa. These results demonstrated that ISMS might offer new opportunities to produce WMJ with excellent qualities at an industrial level.
研究领域:
食品科学
·
营养学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yong Wei,Guijian Liu,Biao Fu,Ruwei Wang,Yuan Liu,Xuan Xue,Mei Sun
Inhalable fine particulate matter (PM), which is rich in Pb and other pollutants from coal-fired power plants, can cause air pollution and severe health problems. To facilitate the development of efficient techniques for controlling fine particulate Pb emissions, in this study, various types of size-resolved fine PM (<10.0 μm) were collected from the outlets of fabric filter units (FFs) at an industrial circulating fluidized bed (CFB) power plant to assess the distribution and partitioning behavior of Pb. The results showed that the mass particle size distribution (PSD) of the collected fine PM followed unimodal distribution, peaking at 5.8–4.7 μm, which might be caused by the fragmentation of limestone additives and new-formed CaSO 4 . However, the mass PSD of Pb for size-fractionated PM displayed different distribution pattern. Two peaks were observed in the size ranges of 5.8–4.7 μm and 1.1–0.7 μm. The mechanism of Pb enrichment in the supermicron particles was mainly controlled by the surface adsorption reaction, which could be explained by 1/d p dependence and be improved using excess active CaO produced by the injected limestone. For submicron particles, gas-film transfer or heterogenous condensation (mass transfer) might represent the deposition mechanism . Besides Pb enrichment, it was found that the submicron particles (<0.7 μm) mainly consisted of Si-rich and Si–Al phases. The emission of those fine SiO 2 -bearing particles should be limited as they can be inhaled and can damage the respiratory system.
研究领域:
环境科学
·
公共卫生
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Huijun Shang,Hengli Li,Weijun Li,Feng Pan,Zhan Du
In this paper, the effects of reaction parameters on the deep-reduction and carbonization process of WO 2 -Co to WC-Co were studied. The results indicate that oxygen loss rate of WO 2 is positively correlated with temperature and methane partial pressure. The partial pressure of methane has no significant effect on the formation rate of WC. The carbon content and particle size of the product increase with the increase of CH 4 partial pressure. By synergistically regulating the reaction temperature to 950 °C, methane partial pressure to 1.25%, and reaction time to 60 min, ultrafine WC-Co powder without η phase can be obtained. The particle size of the composite powder is 128 nm, with total carbon content of 6.16%, free carbon content of 0.4%, and residual oxygen content of 0.05%, respectively. The growth rate relationship of tungsten carbide is as follows:
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 17
·6065-6075
·
IF 5.721
Jundong Xu,Chenglong Wen,Shuisen He,Yu Fan
This article presents novel decyltrimethylammonium bromide-dispersed Ni–Mo sulfide (DTMA-NiMo) as a precursor for preparing an efficient NiMoS/γ-Al2O3 hydrodesulfurization (HDS) catalyst. The as-synthesized DTMA-NiMo is a sulfide containing both long-chain quaternary ammonium and Ni–Mo–S elements. The proposed method not only significantly improves the dispersion of Mo species but also greatly promotes the incorporation of Ni into MoS2 slabs, leading to an increase in the number of NiMoS phases. As a result, the DTMA-NiMo-based NiMoS/γ-Al2O3 catalyst exhibits much higher activity for the HDS of 4,6-dimethyldibenzothiophene (4,6-DMDBT) and fluid catalytic cracking (FCC) diesel than NiMoS/γ-Al2O3 catalysts prepared by the co-impregnation and tetrapropylammonium bromide (TPAB)-assisted methods. This novel strategy sheds a light on the facile and low-cost preparation of superior NiMoS phases without sulfidation treatment.
研究领域:
化学工程
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Shuo Zhang,Zhen Liu,Shuran Li,Shihao Zhang,Hui Fu,Xuan Tu,Wenyi Xu,Xing Shen,Keping Yan,Ping Gan,Xiujuan Feng
This study proposed the fluidization-like dielectric barrier discharge (DBD) plasma for the remediation of lindane contaminated soil and integrated physical and chemical reaction pathway. Soil particle distribution within the reactor was simulated with Euler-Euler and Gidaspow drag models, and a bipolar pulsed power supply was applied to energize the DBD reactor after full fluidized. The effect of soil particles movement on electric features was discussed in terms of voltage waveforms and Lissajous figures. Lindane degradation was found to be related to electrics parameters and soil properties. Soil samples before and after treatment were analyzed by XRD and SEM methods. A 95.98% lindane decomposition and 0.66 mg Lindane /h average reaction rate were obtained with 3 wt% CaO injection by pulse power drove fluidization-like DBD after 32 min treatment. Ozone was proved to play a major role during lindane degrading by plasma. The reaction potential pathway of lindane decomposition contains 4 steps, including dehydrogen, dehydrochlorination, and dechlorination , respectively.
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Yuxiang Liu,Wanrong Liu,Yuchao Lyu,Xinmei Liu,Jun Zhang,Yu Gu,Jiankun Huang,Svetlana Mintova,Zifeng Yan
A hierarchical SAPO-11 was prepared by a grinding synthesis method (GSM) and added as a promoter to increase the iso-paraffin yield of gasoline in fluid catalytic cracking (FCC) reaction. Compared to the classical hydrothermal method , the GSM leads to the creation of intra-crystalline mesopores with the assistance of a surfactant (Cetyltrimethyl Ammonium Bromide, CTAB). CTAB acts as a structure directing agent and as a hard template during the crystallization of SAPO-11. CTAB micelles formed the intra-crystalline mesopores in SAPO-11 crystals. The intra-crystalline mesoporosity of the SAPO-11 is preserved at 800 °C under steaming, which renders the material as an appropriate component of the FCC catalyst. Besides, the presence of mesopores provides isomerization active sites and accelerates the desorption of iso-paraffin. The mesoporous SAPO-11 showed a higher selectivity for iso-paraffin and the yield of iso-paraffin increased by 2%.
研究领域:
化学工程
·
石油加工
✓ 已验证
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 12
·1690
·
IF 3
Jingjing Yang,Jie Zhang,Jintong Liu,Quanxin Yang,Bingdang Wu,Xiaoyi Xu,Tianyin Huang
In order to recover the antimony from wastewater, a custom-designed fluidized-bed reactor (FBR) was employed to treat antimony-containing wastewater. By single-factor experiments, the effects of the solution pH, the molar ratio of [TA]/[Sb3+], the seed size and dosage, the up-flow velocity (U), and the hydraulic retention time (HRT) on antimony recovery were investigated based on the antimony removal and granulation efficiency. The optimum conditions for antimony recovery were obtained at pH 9.0, the molar ratio of [TA]/[Sb3+] of 2, 6 g/L of 13–38 μm Sb2O3as the fluidized seed, and the U and HRT of 42 m/h and 40 min, respectively; the antimony removal and granulation efficiency reached 95% and 91%, respectively. The granular products were analyzed by an X-ray polycrystalline diffractometer (XRD) and scanning electron microscopy (SEM) as cubic Sb2O3, widely used in various industries. The fluidized-bed reactor was operated continuously for 7 days, during which the antimony removal and granulation efficiency were stable at 96% and 93%, respectively. This study demonstrated the feasibility of the fluidized-bed granulation process for the recovery of antimony from wastewater. It provides a novel approach for retrieving and managing antimony-containing wastewater.
研究领域:
环境工程
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）