Polyvinyl alcohol is a refractory compound widely used in industry. Here we report supercritical water oxidation of polyvinyl alcohol solution and desizing wastewater with and without sodium hydroxide addition. Howeve...Polyvinyl alcohol is a refractory compound widely used in industry. Here we report supercritical water oxidation of polyvinyl alcohol solution and desizing wastewater with and without sodium hydroxide addition. However, it is difficult to implement complete degradation of organics even though polyvinyl alcohol can readily crack under supercritical water treatment. Sodium hydroxide had a significant catalytic effect during the supercritical water oxidation of polyvinyl alcohol. It appears that the OH ion participated in the C-C bond cleavage of polyvinyl alcohol molecules, the CO2-capture reaction and the neutralization of intermediate organic acids, promoting the overall reactions moving in the forward direction. Acetaldehyde was a typical intermediate product during reaction. For supercritical water oxidation of desizing wastewater, a high destruction rate （98.25%） based on total organic carbon was achieved. In addition, cases where initial wastewater was alkaline were favorable for supercritical water oxidation treatment, but salt precipitation and blockage issues arising during the process need to be taken into account seriously.展开更多
Single cell temperature difference of lithium-ion battery(LIB) module will significantly affect the safety and cycle life of the battery. The reciprocating air-flow module created by a periodic reversal of the air flo...Single cell temperature difference of lithium-ion battery(LIB) module will significantly affect the safety and cycle life of the battery. The reciprocating air-flow module created by a periodic reversal of the air flow was investigated in an effort to mitigate the inherent temperature gradient problem of the conventional battery system with a unidirectional coolant flow with computational fluid dynamics(CFD). Orthogonal experiment and optimization design method based on computational fluid dynamics virtual experiments were developed. A set of optimized design factors for the cooling of reciprocating air flow of LIB thermal management was determined. The simulation experiments show that the reciprocating flow can achieve good heat dissipation, reduce the temperature difference, improve the temperature homogeneity and effectively lower the maximal temperature of the modular battery. The reciprocating flow improves the safety, long-term performance and life span of LIB.展开更多
In order to utilize the spontaneous accumulation of heat (SAH) reasonably and obtain the high quality sinter with low energy consumption, a lower fuel consumption modeling based on raw materials of a certain steel wor...In order to utilize the spontaneous accumulation of heat (SAH) reasonably and obtain the high quality sinter with low energy consumption, a lower fuel consumption modeling based on raw materials of a certain steel works was built. An air-flow segregation feeding (ASF) experimental equipment was designed to simulate strand feeding process and calculate the lower fuel consumption quantity. Compared with baseline test, the ASF experimental equipment was adopted. The results of sinter pot tests show that the solid fuel consumption is lower than that in baseline test, which is decreased by 5.8%. Meanwhile, other sinter indexes, such as pan yeild, tumbler strength and strand productivity are improved. The mineralogical examination indicates that the mineral compositions and micostructures are improved in sinter.展开更多
Piezoceramic is ubiquitously used in high-performance sensors and actuators.Three-dimensional(3D)printing of lead zirconate titanate(PZT)is attractive and highly desired for such device applications,but most of the ex...Piezoceramic is ubiquitously used in high-performance sensors and actuators.Three-dimensional(3D)printing of lead zirconate titanate(PZT)is attractive and highly desired for such device applications,but most of the existing methods are inherently limited to micron resolution,which makes them untenable for fabricating complex 3D architectures with high-definition features.Here,an electrohydrodynamic jet(E-Jet)nanoprinting strategy has been proposed to fabricate PZT 3D structures with the characteristics of flexibility and scalability.Different kinds of 3D PZT true nanostructures(resolution∼40 nm,aspect ratio∼400)were directly fabricated using a 100μm-sized nozzle.And the PZT nanostructures exhibited well-developed perovskite crystal morphology,large elastic strain(elongation≈13%),and high piezoelectric property(d_(31)≈(236.5×10^(−12))C·N^(-1)).A bionic PZT air-flow sensor was printed to monitor air-flow detection,demonstrating well sensitivity with ultra-slow air-flow of 0.02 m·s^(-1).The discovery reveals an efficient pathway to 3D-printing PZT nanostructures for next-generation high-performance piezoelectric devices.展开更多
基金supported by the National High Technology Research and Development Program of China (No.2006AA06Z313)the Program for New Century Excellent Talents in University of Chinese Education Ministry (No.NCET-07-0678)the Opened Fund of Jiangsu Key Lab for Clean Energy and Power Machinery Engineering (No.QK08003)
文摘Polyvinyl alcohol is a refractory compound widely used in industry. Here we report supercritical water oxidation of polyvinyl alcohol solution and desizing wastewater with and without sodium hydroxide addition. However, it is difficult to implement complete degradation of organics even though polyvinyl alcohol can readily crack under supercritical water treatment. Sodium hydroxide had a significant catalytic effect during the supercritical water oxidation of polyvinyl alcohol. It appears that the OH ion participated in the C-C bond cleavage of polyvinyl alcohol molecules, the CO2-capture reaction and the neutralization of intermediate organic acids, promoting the overall reactions moving in the forward direction. Acetaldehyde was a typical intermediate product during reaction. For supercritical water oxidation of desizing wastewater, a high destruction rate （98.25%） based on total organic carbon was achieved. In addition, cases where initial wastewater was alkaline were favorable for supercritical water oxidation treatment, but salt precipitation and blockage issues arising during the process need to be taken into account seriously.
基金Project(50803008)supported by the National Natural Science Foundation of ChinaProjects(14JJ4035,2011RS4067)supported by the Natural Science Foundation of Hunan Province,China+1 种基金Project(2013-sdllmd-08)supported by the State Key Laboratory of Luminescent Materials and Devices(South China University of Technology),ChinaProjects(20100480946,201104508)supported by the China Postdoctoral Science Foundation,China
文摘Single cell temperature difference of lithium-ion battery(LIB) module will significantly affect the safety and cycle life of the battery. The reciprocating air-flow module created by a periodic reversal of the air flow was investigated in an effort to mitigate the inherent temperature gradient problem of the conventional battery system with a unidirectional coolant flow with computational fluid dynamics(CFD). Orthogonal experiment and optimization design method based on computational fluid dynamics virtual experiments were developed. A set of optimized design factors for the cooling of reciprocating air flow of LIB thermal management was determined. The simulation experiments show that the reciprocating flow can achieve good heat dissipation, reduce the temperature difference, improve the temperature homogeneity and effectively lower the maximal temperature of the modular battery. The reciprocating flow improves the safety, long-term performance and life span of LIB.
基金Project(NECT-04-0748) supported by New Century Excellent Talents Program of China
文摘In order to utilize the spontaneous accumulation of heat (SAH) reasonably and obtain the high quality sinter with low energy consumption, a lower fuel consumption modeling based on raw materials of a certain steel works was built. An air-flow segregation feeding (ASF) experimental equipment was designed to simulate strand feeding process and calculate the lower fuel consumption quantity. Compared with baseline test, the ASF experimental equipment was adopted. The results of sinter pot tests show that the solid fuel consumption is lower than that in baseline test, which is decreased by 5.8%. Meanwhile, other sinter indexes, such as pan yeild, tumbler strength and strand productivity are improved. The mineralogical examination indicates that the mineral compositions and micostructures are improved in sinter.
基金supported by National Natural Science Foundation of China(Grant No.52105577)Natural Science Foundation of Zhejiang Province(Grant No.LQ22E050001)+3 种基金Natural Science Foundation of Ningbo(Grant Nos.2024J427 and 2023J376)China Postdoctoral Science Foundation(Grant No.2024M753510)Ningbo Yongjiang Talent Introduction Programme(Grant No.2021A-137-G)Research Grants Council of the Hong Kong Special Administrative Region,China(Grant Nos.11200623 and RFS2021-1S05).
文摘Piezoceramic is ubiquitously used in high-performance sensors and actuators.Three-dimensional(3D)printing of lead zirconate titanate(PZT)is attractive and highly desired for such device applications,but most of the existing methods are inherently limited to micron resolution,which makes them untenable for fabricating complex 3D architectures with high-definition features.Here,an electrohydrodynamic jet(E-Jet)nanoprinting strategy has been proposed to fabricate PZT 3D structures with the characteristics of flexibility and scalability.Different kinds of 3D PZT true nanostructures(resolution∼40 nm,aspect ratio∼400)were directly fabricated using a 100μm-sized nozzle.And the PZT nanostructures exhibited well-developed perovskite crystal morphology,large elastic strain(elongation≈13%),and high piezoelectric property(d_(31)≈(236.5×10^(−12))C·N^(-1)).A bionic PZT air-flow sensor was printed to monitor air-flow detection,demonstrating well sensitivity with ultra-slow air-flow of 0.02 m·s^(-1).The discovery reveals an efficient pathway to 3D-printing PZT nanostructures for next-generation high-performance piezoelectric devices.
