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< Page ,Total 23 >
Effect of Hydrogen on Fracture Toughness Behavior of 2.25Cr-1Mo-0.25V Steel CPCI-S
会议论文 | 2019 | ASME Pressure Vessels and Piping Conference (PVP 2018)
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Abstract :

2.25Cr-lMo-0.25V steel, which is a high strength low alloy (HSLA) steel, has been widely used for structural material of hydrogenation reactor due to its excellent combination of mechanical properties and resistance to hydrogen embrittlement (HE). However, it still suffers serious hydrogen damage during the aggressive service environment. When sufficient hydrogen concentrates in the reactor steel, the ductility and strength of the steel will be greatly decreased. Such a phenomenon of reduction of toughness is known as HE, and it can significantly weaken the safety and reliability of equipment. Therefore, the aim of this investigation is to focus on the effect of hydrogen on fracture toughness behavior of 2.25Cr-lMo-0.25V steel. The fracture mechanics specimens in geometry of single edge notch bending were used. The immersion charging method was used to pre-charge hydrogen inside the specimens. Moreover, the fracture toughness of specimens with and without hydrogen pre charging were measured following the ASTM E1820 standard. Finally, the fracture morphology was observed by scanning electron microscopy (SEM) to identify the HE mechanisms. The results of the present investigation showed that the pre-charged hydrogen resulted in significant reduction of fracture toughness of 2.25Cr-lMo-0.25V steel, indicating a reduced crack growth resistance of specimens in the presence of hydrogen. Furthermore, the uncharged specimens failed in a ductile manner, whereas the fracture of pre-charged specimens is a mixed ductile and brittle fracture mode. It was believed that the hydrogen-induced decohesion (HEDE) mechanism contributed to the HE in hydrogen pre-charged specimens.

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GB/T 7714 Chai, Mengyu , Song, Yan , Zhang, Zaoxiao et al. Effect of Hydrogen on Fracture Toughness Behavior of 2.25Cr-1Mo-0.25V Steel [C] . 2019 .
MLA Chai, Mengyu et al. "Effect of Hydrogen on Fracture Toughness Behavior of 2.25Cr-1Mo-0.25V Steel" . (2019) .
APA Chai, Mengyu , Song, Yan , Zhang, Zaoxiao , Duan, Quan , Cheng, Guangxu . Effect of Hydrogen on Fracture Toughness Behavior of 2.25Cr-1Mo-0.25V Steel . (2019) .
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Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH4: A First-Principles Study SCIE
期刊论文 | 2019 , 123 (3) , 1550-1558 | JOURNAL OF PHYSICAL CHEMISTRY C
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A metal + nonmetal (Mg + N) partial cosubstitution method for improving the dehydrogenation properties of lithium borohydride (LiBH4), which is a potential solid hydrogen storage material, is proposed. A detailed analysis of the electronic structure, charge density redistribution, and dehydrogenation properties reveals that the cosubstitution has a more positive effect on several properties, including the thermal stability, hydrogen dissociation energy, and dehydrogenation temperature, than the single substitution of Mg or N. When Mg and N are codoped into LiBH4, its formation enthalpy increases from -0.332 to -0.293 eV.atom(-1) and its thermal stability decreases. Moreover, density functional theory calculations of the Mg + N cosubstituted system show that its hydrogen dissociation energy is the lowest and the onset dehydrogenation temperature is reduced to 160.5 degrees C, indicating that Mg + N cosubstitution can significantly promote the dehydrogenation thermodynamic performance of LiBH4 materials.

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GB/T 7714 Huang, Zhuonan , Wang, Yuqi , Wang, Di et al. Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH4: A First-Principles Study [J]. | JOURNAL OF PHYSICAL CHEMISTRY C , 2019 , 123 (3) : 1550-1558 .
MLA Huang, Zhuonan et al. "Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH4: A First-Principles Study" . | JOURNAL OF PHYSICAL CHEMISTRY C 123 . 3 (2019) : 1550-1558 .
APA Huang, Zhuonan , Wang, Yuqi , Wang, Di , Yang, Fusheng , Wu, Zhen , Zheng, Lan et al. Synergistic Effects of Mg and N Cosubstitution on Enhanced Dehydrogenation Properties of LiBH4: A First-Principles Study . | JOURNAL OF PHYSICAL CHEMISTRY C , 2019 , 123 (3) , 1550-1558 .
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Non-neutral catalyst and reaction energy recovery to minimize the energy consumption for hydrogen production by recyclably indirect H2O electrolysis and CO2 capture EI SCIE
期刊论文 | 2019 , 180 , 1203-1216 | Energy Conversion and Management
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Abstract :

Hydrogen utilization and CO2 capture significantly improve the environment. In order to reduce the energy penalty of hydrogen production and CO2 capture, the idea of this work is to integrate the hydrogen production and CO2 capture. Here, the recyclable electro-driven process of CO2 capture and indirect H2O electrolysis was developed. In the process, the energy recovery system was developed to utilize the reaction heat. The non-neutral Ni based catalyst with single-atom catalysis was designed. DFT model and energy recovery model were developed. The turnover frequency, transmission value, electron density, band structure, reaction kinetics of hydrogen production and CO2 desorption were determined. A mechanism of second dehydrogenation and second hydrogen release was identified for the non-neutral catalysis. Non-neutral NiAlTiR+ catalyst enhanced the electron transport and made electron dense region extend to the single atom zone. The 90% yield of hydrogen was produced due to the fast electron transport. The well regenerated catalyst during the 25 cycles produced the 80–90% turnover frequency and transmission compared with the fresh catalyst. The non-neutral catalyst, catalyst regeneration and reaction energy recovery reduced the energy consumption for H2 production and CO2 capture to 0.4 V and 1 GJ/t. © 2018

Keyword :

CO2 capture Electron transport Energy recovery system Fast electron transport Hydrogen utilization Non-neutral Transmission value Turnover frequency

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GB/T 7714 Yu, Yunsong , Zhang, Chen , Zhang, Zaoxiao et al. Non-neutral catalyst and reaction energy recovery to minimize the energy consumption for hydrogen production by recyclably indirect H2O electrolysis and CO2 capture [J]. | Energy Conversion and Management , 2019 , 180 : 1203-1216 .
MLA Yu, Yunsong et al. "Non-neutral catalyst and reaction energy recovery to minimize the energy consumption for hydrogen production by recyclably indirect H2O electrolysis and CO2 capture" . | Energy Conversion and Management 180 (2019) : 1203-1216 .
APA Yu, Yunsong , Zhang, Chen , Zhang, Zaoxiao , Wang, Geoff G.X. . Non-neutral catalyst and reaction energy recovery to minimize the energy consumption for hydrogen production by recyclably indirect H2O electrolysis and CO2 capture . | Energy Conversion and Management , 2019 , 180 , 1203-1216 .
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EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 2.25CR1M00.25V STEEL BY THE INFLUENCE OF HEAT TREATMENT AND WELDING CPCI-S
会议论文 | 2019 | ASME Pressure Vessels and Piping Conference (PVP 2018)
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Abstract :

In this paper, the mechanical properties and microstructural changes of 2.25Cr 1Mo0.25V steel under different heat treatment and welding process were investigated. The heat treatment of steel during practical processing is taken as a reference. Different heat treatment time are used to obtain samples with different condition. Automatic submerged arc welding was used to obtain welding sample. The mechanical properties of different samples are obtained by tensile test; the evolution of microstructure and precipitates of different sample with heat treatment and welding was studied on scanning electron microscopy. The experimental results show that with the increase of heat treatment time, the strength of the samples decreases and the plasticity remains nearly constant. Heat treatment also affects the precipitation of carbides; the longer the heat treatment time is, the more precipitates are. Compared with the base metal, the welding metal sample has higher strength. The amount of precipitates in welding metal is much larger than it in base metal. The research on precipitation shows that there are different kinds of precipitates which have different morphologies in welding metal.

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GB/T 7714 Li, Qing , Cheng, Guangxu , Qin, Mu et al. EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 2.25CR1M00.25V STEEL BY THE INFLUENCE OF HEAT TREATMENT AND WELDING [C] . 2019 .
MLA Li, Qing et al. "EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 2.25CR1M00.25V STEEL BY THE INFLUENCE OF HEAT TREATMENT AND WELDING" . (2019) .
APA Li, Qing , Cheng, Guangxu , Qin, Mu , Zhang, Zaoxiao . EXPERIMENTAL STUDY ON MECHANICAL PROPERTIES AND MICROSTRUCTURE OF 2.25CR1M00.25V STEEL BY THE INFLUENCE OF HEAT TREATMENT AND WELDING . (2019) .
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Effects of gasification condition on the overall performance of methanol electricity polygeneration system SCIE
期刊论文 | 2019 , 184 , 362-373 | ENERGY CONVERSION AND MANAGEMENT
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Abstract :

The operating conditions of coal gasifier have significant effects on the overall system performance of an associated process. This study designs a methanol-electricity polygeneration system and presents a comprehensive discussion about the effects of the ratio of steam to coal, the ratio of O-2 to coal, the ratio of carrier gas (CO2) to coal and the CO2 concentration in methanol synthesis gas on different performance indicators. The results show that the steam/coal ratio has slight effects on the overall system performance due to the offset in different sections. An optimal O-2/coal ratio exists in the range of 0.84-0.86 to achieve the minimum unit water consumption and the maximum methanol production and energy efficiency, which is almost consistent with the range that the H-2 concentration in gasifier syngas reaches the maximum value. The amount of carrier gas CO2 and the CO2 concentration in methanol synthesis gas should be kept at a low level to just meet the requirements of coal pressurization and synthesis reaction. This comprehensive sensitivity analysis can provide some significant guidance for the system design.

Keyword :

H/C ratio adjustment Coal gasification Energy efficiency Polygeneration Water consumption

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GB/T 7714 Qin, Zhen , Bhattacharya, Sankar , Tang, Kai et al. Effects of gasification condition on the overall performance of methanol electricity polygeneration system [J]. | ENERGY CONVERSION AND MANAGEMENT , 2019 , 184 : 362-373 .
MLA Qin, Zhen et al. "Effects of gasification condition on the overall performance of methanol electricity polygeneration system" . | ENERGY CONVERSION AND MANAGEMENT 184 (2019) : 362-373 .
APA Qin, Zhen , Bhattacharya, Sankar , Tang, Kai , Zhang, Zaoxiao . Effects of gasification condition on the overall performance of methanol electricity polygeneration system . | ENERGY CONVERSION AND MANAGEMENT , 2019 , 184 , 362-373 .
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Acoustic Emission Detection during Welding Residual Stresses Release in 2.25Cr1Mo0.25V Steel Welds CPCI-S
会议论文 | 2018 , 5 (5) , 13759-13766 | International Conference on Advanced Energy Materials (AEM)
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The main goal of this study is acoustic emission (AE) measuring of residual stresses in welded structures. The welding residual stresses release in three 2.25Cr1Mo0.25V welded specimens with different heat treatment conditions were detected and evaluated during the hole drilling strain gauge measurement by AE technique. AE signals from residual stresses release were detected and analyzed for the first time. The results showed that the waveform of residual stress release signal is in a burst type and the spectral energy has the peak frequency at 147 kHz. Furthermore, the AE hits of as-welded specimen are much more than those of specimens after heat treatment due to the higher welding residual stresses. This indicates that AE is sensitive to residual stresses and could be used as a tool to monitor residual stresses release and to make evaluations on residual stresses qualitatively in the future. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Residual stress Hole drilling strain gauge measurement Weld Acoustic emission

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GB/T 7714 Chai, Mengyu , Qin, Mu , Zheng, Yaoting et al. Acoustic Emission Detection during Welding Residual Stresses Release in 2.25Cr1Mo0.25V Steel Welds [C] . 2018 : 13759-13766 .
MLA Chai, Mengyu et al. "Acoustic Emission Detection during Welding Residual Stresses Release in 2.25Cr1Mo0.25V Steel Welds" . (2018) : 13759-13766 .
APA Chai, Mengyu , Qin, Mu , Zheng, Yaoting , Hou, Xinglong , Zhang, Zaoxiao , Cheng, Guangxu et al. Acoustic Emission Detection during Welding Residual Stresses Release in 2.25Cr1Mo0.25V Steel Welds . (2018) : 13759-13766 .
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Hydrodynamic Characteristics and Particle Removal Efficiency Off-gas from Urea Prilling Tower in Spraying Scrubber EI Scopus CSCD PKU
期刊论文 | 2018 , 32 (4) , 785-793 | Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities
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Abstract :

Spray scrubbing is effective to remove hydrophilic particles from Urea Prilling Tower. Simulation of dust removal based on particle capture mechanism was investigated for spray scrubbing process. Numerical simulation and experiments were conducted to study flow characteristics and key factors such as gas velocity, spraying density and particle size were analyzed. The results show that: 1) air flow near wall has maximum velocity with wall flow, which leads to dust escape. 2) particle removal efficiency increases with the increase of spraying density, but the increase rate gradually decreases. Dust removal efficiency does not always decrease with the increase of gas velocity. For example, when spraying density is 2 m∙h-1 and gas velocity is 2.5 m∙s-1, removal efficiency increases. 3) Removal efficiency of particles > 10μm can reach 95%. However, the removal of particles < 10 μm is difficult due to the random movement of fine particles. 4) gas velocity has few effects on particle removal efficiency. Therefore, it is more effective to improve particle removal efficiency by increasing spraying density. © 2018, Editorial Board of "Journal of Chemical Engineering of Chinese Universities". All right reserved.

Keyword :

Dust removal efficiency Flow charac-teristics Hydrodynamic characteristics Hydrophilic particles Maximum velocity Particle capture Particle removal efficiency Removal efficiencies

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GB/T 7714 Wang, Si-Min , Wang, Jia-Rui , Song, Chen et al. Hydrodynamic Characteristics and Particle Removal Efficiency Off-gas from Urea Prilling Tower in Spraying Scrubber [J]. | Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities , 2018 , 32 (4) : 785-793 .
MLA Wang, Si-Min et al. "Hydrodynamic Characteristics and Particle Removal Efficiency Off-gas from Urea Prilling Tower in Spraying Scrubber" . | Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities 32 . 4 (2018) : 785-793 .
APA Wang, Si-Min , Wang, Jia-Rui , Song, Chen , Zhang, Zao-Xiao , Wen, Jian . Hydrodynamic Characteristics and Particle Removal Efficiency Off-gas from Urea Prilling Tower in Spraying Scrubber . | Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities , 2018 , 32 (4) , 785-793 .
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Toward the design of interstitial nonmetals co-doping for Mg-based hydrides as hydrogen storage material EI Scopus SCIE
期刊论文 | 2018 , 33 (23) , 4080-4091 | Journal of Materials Research
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The strong interactions between Mg and Ni/NiH4 are attributed to harsh operating conditions and difficulties for H2 release, restricting the practical applications of the Mg-based hydrides. In this study, a new method of interstitial nonmetals co-doping was proposed to reduce the strong interactions. The calculation results showed that the method of interstitial nonmetals co-doping causes a more significant reduction in the thermal stability of Mg-based hydrides, as compared with the methods of either single transition metal or nonmetal doping. To determine the influence mechanism, a theoretical study was conducted based on the first-principles calculations. The computations demonstrated that the criss-cross action between B-Ni and N-Mg bonds weakens the bonding effects between Mg and Ni/NiH4. Besides, the mutual interactions between nonmetals and H atoms could weaken Ni-H bonding effects and stimulate the breaking of stable NiH4 clusters, thereby facilitating the release of H2 from the hydride. Copyright © Materials Research Society 2018.

Keyword :

Calculation results First-principles calculation Influence mechanism Mg-based hydrides Mutual interaction Operating condition Strong interaction Theoretical study

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GB/T 7714 Wu, Zhen , Zhu, Luying , Yang, Fusheng et al. Toward the design of interstitial nonmetals co-doping for Mg-based hydrides as hydrogen storage material [J]. | Journal of Materials Research , 2018 , 33 (23) : 4080-4091 .
MLA Wu, Zhen et al. "Toward the design of interstitial nonmetals co-doping for Mg-based hydrides as hydrogen storage material" . | Journal of Materials Research 33 . 23 (2018) : 4080-4091 .
APA Wu, Zhen , Zhu, Luying , Yang, Fusheng , Nyamsi, Serge N. , Porpatham, Ekambaram , Zhang, Zaoxiao . Toward the design of interstitial nonmetals co-doping for Mg-based hydrides as hydrogen storage material . | Journal of Materials Research , 2018 , 33 (23) , 4080-4091 .
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Theoretical formulation and performance analysis of a novel hydride heat Pump(HHP) integrated heat recovery system Scopus SCIE
期刊论文 | 2018 , 163 , 208-220 | Energy
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© 2018 Elsevier Ltd Many efforts are dedicated globally to industrial waste heat recovery in hope of reducing energy consumption and pollutants emission. A novel system composed of direct heat exchanger and hydride heat pump is proposed to achieve this target, which could effectively utilize the sensible heat from a process stream at both high and low temperatures. In this paper, we present the fundamental procedure for formulation of such a system, including heat duty assignment, working pair screening and cycle modification. In addition, thermodynamic analysis on the performance of the integrated system is conducted, and the results exhibit the possibility of building competitive alternative to existing absorption heat exchanger (AHE). Finally, the impacts of design variables and material properties on system performance are discussed, providing a benchmark for applying such a system on various occasions.

Keyword :

Coefficient of performance Hydride heat pump Sensible heat loss Triangular heat transfer Waste heat recovery

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GB/T 7714 Yang, Fusheng , Wu, Zhen , Liu, Shengzhe et al. Theoretical formulation and performance analysis of a novel hydride heat Pump(HHP) integrated heat recovery system [J]. | Energy , 2018 , 163 : 208-220 .
MLA Yang, Fusheng et al. "Theoretical formulation and performance analysis of a novel hydride heat Pump(HHP) integrated heat recovery system" . | Energy 163 (2018) : 208-220 .
APA Yang, Fusheng , Wu, Zhen , Liu, Shengzhe , Zhang, Yang , Wang, Geoff , Zhang, Zaoxiao et al. Theoretical formulation and performance analysis of a novel hydride heat Pump(HHP) integrated heat recovery system . | Energy , 2018 , 163 , 208-220 .
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Tuning hydrogen dissociation behavior of magnesium borohydride (100) surface by transition metal and nonmetal co-substitution EI Scopus SCIE
期刊论文 | 2018 , 15 , 245-253 | Materials Today Communications
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© 2018 Elsevier Ltd The influences of transition metal Ni and nonmetal N co-substitution for partial metal Mg and nonmetal B elements on the hydrogen dissociation behavior of Mg(BH4)2 (100) surface are investigated using the first-principles calculations in this work. The calculations results indicate that the co-substitution of Ni + N is a feasible and effective method for reducing the thermal stability and hydrogen dissociation energy, which helps to enhance the dehydrogenation performance of Mg(BH4)2 accordingly. The Ni + N co-substitution causes the hydrogen dissociation energy of the (100) surface to reduce from 2.267 to 1.720 eV/atom because of the co-existence of dual anionic groups NiH6 and NH2. The co-existence breaks stable BH4 group into unstable BH3 or BH2 groups. Besides, the first H atom dissociated from the borohydride (100) surface is shifted from the initial B–H bond to a weaker Ni–H bond with a longer bond length. The shift suggests that the hydrogen dissociation process on the (100) surface is facilitated by the Ni + N co-substitution.

Keyword :

Co-substitution Complex hydride First-principles study Hydrogen dissociation

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GB/T 7714 Wu, Zhen , Zhu, Luying , Zhang, Zaoxiao et al. Tuning hydrogen dissociation behavior of magnesium borohydride (100) surface by transition metal and nonmetal co-substitution [J]. | Materials Today Communications , 2018 , 15 : 245-253 .
MLA Wu, Zhen et al. "Tuning hydrogen dissociation behavior of magnesium borohydride (100) surface by transition metal and nonmetal co-substitution" . | Materials Today Communications 15 (2018) : 245-253 .
APA Wu, Zhen , Zhu, Luying , Zhang, Zaoxiao , Yang, Fusheng , Wang, Yuqi . Tuning hydrogen dissociation behavior of magnesium borohydride (100) surface by transition metal and nonmetal co-substitution . | Materials Today Communications , 2018 , 15 , 245-253 .
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