Heliyon
·
2024
·
IF 3.4
Zhihong Duan,Weiqi Lian,Pujie Zhan,Junde Song,Canyin Li,Xiangji Yang,Bingjiang Chen,Yunrong Lyu
The corrosion and leakage issues of rapid quench boilers have become increasingly prominent in ethylene plants, significantly disrupting the regular functioning of equipment. In pursuit of a more efficacious corrosion protection strategy, a study was conducted on the heat exchange tubes experiencing corrosion leakage in the quenching boiler of a petrochemical company. By means of macroscopic observation, chemical composition analysis, mechanical property analysis, metallographic analysis, fracture surface morphology observation, and energy spectrum analysis, combined with on-site process parameters, a comprehensive analysis of the failure causes of the corroded leakage sites was conducted. It was concluded that the perforation of the heat exchange tubes was caused by high-temperature oxygen corrosion and oxidation induced by scale accumulation, and reasonable countermeasures were proposed. According to X-ray diffraction analysis (XRD), it was found that the scale mainly consisted of Fe 2 O 3 and Fe 3 O 4 , and the scale formation time was relatively long. It is speculated that the accumulation of scale is caused by the rust from the upstream equipment pipelines of the boiler water being carried into the quenching boiler with the fluid flow and accumulating at this location. Regarding the heat exchange tubes, the primary causes of failure are high-temperature oxygen corrosion and oxidation. To verify whether the relevant reactions can occur spontaneously, the critical transition temperature of the reactions is calculated using the free entropy function method. The calculated critical temperature for the occurrence of high-temperature oxygen corrosion and oxidation in the heat exchange tubes under failure conditions is determined to be T ＜ 1058 K ~ 785 °C. Therefore, under the conditions of heat exchange tube failure, high-temperature oxygen corrosion and oxidation can occur spontaneously.
研究领域:
材料科学
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化学工程
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腐蚀科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2021
·
IF 7.311
R. He,Y. Liao,J. Huang,T. Cheng,X. Zhang,P. Yang,H. Liu,K. Liu
Air-conditioning in buildings is energy intensive and takes up large proportion of global energy consumption. To pursue low energy expenditure, herein, we propose a radiant air-conditioning strategy with infrared transparent and low thermal conductive porous polyethylene aerogels . The aerogel allows direct heat exchange between the cooling panel and human body via radiation and avoids cooling the entire space. Compared with traditional space air conditioning, a 6-mm polyethylene aerogel–assisted radiant air-conditioning saves the electricity by 31% under the same cooling and ambient temperature. Moreover, high solar reflectance and low thermal conductivity of the porous polyethylene hold great promise of the strategy in working outdoors. Our calculation demonstrates two-thirds of energy saving compared with direct space cooling in a typical summer day in Wuhan. These results show great potential of the cooling method in building cooling both in closed spaces and open conditions.
研究领域:
材料科学
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能源工程
·
建筑环境
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Panxi Wu,Yitong Dai,Tong Du,Xuejiao Chen,shujun Zhao,Yongsheng Guo,Wenjun Fang
Pinane is a downstream product of turpentine and is the basic raw material for the production of flavor products such as linalool and lauryl alcohol. To better understand the performance of biomass hydrocarbon pinane as endothermic hydrocarbon fuel, the pyrolysis kinetics and heat exchange performance of pinane under different conditions was investigated. The pyrolysis kinetics of pinane was obtained in a batch reactor at the temperature range of 553–603 K, the apparent rate constants at different test temperatures were obtained, along with the corresponding Arrhenius parameters of pre-exponential factor A = 5.7 × 10 10 s −1 and apparent activation energy E a = 173 kJ·mol −1 . Compared with other typical model fuels, the pyrolysis of pinane shows higher thermal instability. The regenerative cooling test of pinane at temperatures from 400 to 950 K was further performed. The corresponding heat sink is 2.43 MJ·kg −1 at 898 K, indicating the advantage of pinane in the providing higher heat sink in a relatively low temperature range. The detailed analysis of pyrolysis products indicates that pinane mainly undergoes direct ring-opening isomerization at a relatively low temperature stage, producing a large amount of C10 hydrocarbon products. As the temperature rises, the isomers are further cracked to generate small-carbon-number hydrocarbons, accompanied by the formation of a large amount of gas products. Besides, the morphology and spatial distribution of solid deposits on the inner wall of reaction tube after the heat exchange process were characterized by scanning electron microscope and combustion of carbon method. Furthermore, based on the result of product distribution analysis and quantum calculations, a pyrolysis mechanism of pinane has been proposed.
研究领域:
能源科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Huimin Wang,Jiajia Gui,Fei Huang,Congjie Gao,Lixin Xue
A simple liquid-solid interface polymerization (LSIP) strategy was developed to prepare high performance polyamide (PA) based thin film composite (TFC) total heat exchange membranes (THEMs) to avoid the use of organic solvents and surfactant during the inverse phase interface polymerization processes between piperazine (PIP) and 1,3,5-benzenetricarbonyl trichloride (TMC) on porous polyethylene (PE) substrates. The non-polar organic solvent in the TMC organic phase coated on the surface of the PE surfaces was completely removed beforehand by evaporation to form polar TMC solid coating on the PE surfaces and facilitate the quick spreading of lately added aqueous PIP solutions, forming dense and highly cross-linked PA separation layers with superior total heat recovery efficiency and CO 2 barrier property. The effects of TMC loading level, PIP concentration, and LSIP reaction time on the structure and performance of PA/PE-TFC THEMs were systematically investigated, leading to the formation of THEMs 0.20P-0.10T-6 with ultra-low CO 2 permeance of 0.9 GPU , and high sensible heat exchange efficiency of 94.3 %, water vapor flux of 2128 g m −2 ·24 h −1 , and enthalpy exchange efficiency of 76.8 %.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Shiyang Li,Longdou Tu,Yeqiang Lu,Mingjie Lin,Junmei Ma,Chaojie Bai,Congjie Gao,Lixin Xue
A novel strategy was developed to build high-performance thin film composite (TFC) total heat exchange membranes (THEMs) by in situ growing ZIF-8 crystalline micro-leaves (ZIF-L) from Polyethyleneimine (PEI) coated on polysulfone (PSF) ultra-filtration substrates. It was found that flexible PEI polymeric chains could tightly cross-link and seal large masses of ZIF-L micro-leaves (ZIF/PEI wt. ratio up to 18.5) to thwart CO 2 permeation, on top of PSF substrate. Such PEI cross-linking could also effectively open up the internal channels of ZIF-L micro-leaves to enhance moisture permeance and latent heat recovery without trading off CO 2 gas barring property. ZIF-L in varied shapes protruded into the air stream could provide ultra-rough surfaces with increased surface area for improved total energy recovery efficiency. Optimized PEI/ZIF-L TFC THEMs showed ultra-low CO 2 permeance of 0.5–8 GPU and ultra-high total heat recovery rates of 68–74%.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2024
·
IF 3
Wang Weiyao,Cai Xiaoming,Gao Wen,Gou Quan,Xiao Weiqi,Yan Zhengyang,Gao Yu,Jiang Xiaodi,Wang Xu,Tan Honglin,Cai Jinming
Nanofluid plays an important role in heat transfer engineering as a heat transfer medium. Therefore, we developed graphene oxide (GO)/carboxylated ferric tetroxide (Fe 3 O 4 –COOH) nanofluid with high stability using a two-step method. The preparation, characterization, physical properties and heat transfer properties of nanoparticles and nanofluids were investigated. The results show that GO/Fe 3 O 4 –COOH(GF) nanofluids present high stability at low concentrations (0.01 mass%, 0.05 mass% and 0.10 mass%) with absolute values of Zeta potential value greater than 30 mV. By adjusting the pH, it was found that GF nanofluids presented the best stability at pH = 10. A study of the physical properties of the nanofluids revealed that the viscosity of the GF nanofluids did not increase excessively with the addition of Fe 3 O 4 –COOH nanoparticles relative to the GO nanofluids. The heat transfer platform tests revealed that compared with the same concentration of GO nanofluids, the GF nanofluids have significantly higher heat dissipation efficiency. The temperature drop of 0.05 mass% GF nanofluid is higher than that of deionized water at the same pump power. We believe that well-stabilized GO nanofluids incorporating Fe 3 O 4 –COOH will provide more meaningful value in heat exchange than GO nanofluids.
研究领域:
材料科学
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热力学工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Chao Chen,Lingping Luo,Shijian Song,Yan Chen,Juexin Wang,Congjie Gao,Fei Huang,Lixin Xue
Total heat exchange membranes (THEMs) are vital for minimizing energy consumption and enhancing indoor air quality in energy recovery ventilation (ERV) systems. Manipulating the surface morphology of polyamide (PA) membranes via nanofiller-mediated interfacial polymerization is key to advancing total heat recovery performance. This study presented the fabrication of PA thin-film nanocomposite (TFN) membranes by integrating self-assembled poly(amic acid-imide) nanoflowers (P(AA-I)-NFs) with intertwined nanosheets into the organic phase. This facile approach effectively eliminated nonselective interphase voids and defects, owing to the superior polymer affinity of the organic nanoflowers. The finely tuned intra- and inter-layer channels within P(AA-I)-NFs significantly impacted monomer mass transfer, facilitated the shuttle effect, expanded the interfacial polymerization zone, and led to the formation of a rougher, thicker PA layer with enhanced surface area. The optimized P(AA-I)-NFs/PA TFN membranes exhibited outstanding performance, including CO₂ permeability of 0.51 GPU, water vapor permeability of 656.59 GPU, and an enthalpy exchange efficiency of 71.47 %, surpassing the trade-off limitations typically observed in commercial and other advanced THEMs. These findings underscored the potential of P(AA-I)-NFs-mediated TFN membranes as highly competitive candidates for next-generation ERV systems.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Chaojie Bai,Yang Gao,Zuoqun Zhang,Longdou Tu,Dajian Cai,Zixuan Lv,Congjie Gao,Lixin Xue
It is an important initiative to reduce the building energy consumption using energy recovering ventilation (ERV) systems. The application of ERV systems is hindered by the low CO2 barrier performance of commercial total heat exchange membranes (THEMs) that lead to unsatisfactory indoor air refreshing rate, and there is an urgent need for THEMs that have improved CO2 barrier properties and effective energy recovery efficiencies. Here, we report the formation of novel ZIF/PA TFN THEMs based on ZIF-7-X nanoparticles (NPs) with “core–shell” structures and tunable particle sizes, formed from benzimidazole (BIM) ligands and BIM substituted by −NH2, −CH3, −C2H5, and −C3H7 functional groups. The NPs were mixed with pyr omellitic triformyl chloride (TMC) in the organic phase during the interface polymerization process to form ZIF/PA TFN membranes. The total heat exchange performance of ZIF/PA TFN membranes could be effectively modified by the type and quantity of ZIF-7-X NPs added. The CO2 barrier properties and water vapor permeability of ZIF/PA TFN membranes could be improved by the addition of optimal levels of ZIF-7-X NPs, showing low CO2 permeance of 7.76 GPU, high H2O permeance of 663.8 GPU, and excellent enthalpy exchange efficiency of 72.1%. This work provided an effective strategy for tuning not only the nanostructures of ZIF-7 fillers but also the CO2 barrier properties of the formed ZIF/PA TFN membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy & Environmental Science
·
2025
·
IF 30.8
Huan Li,Yupeng Wang,Xinzhi Wu,Kang Zhu,Shuaihua Wang,Mao Yu,Weishu Liu
Solar thermoelectric generators (STEGs) convert solar heat into electricity, attracting interest in powering various Internet-of-Things devices. The conventional route to design a STEG involves separate considerations of thermal engineering and materials science by using a thermal boundary condition of constant heat flux. This paper provides a more direct and convenient way to design solar thermoelectric generators. First, we propose a general efficiency model and figure-of-merit (ZQ), which directly incorporates the thermal boundary conditions, heat exchange thermal resistances, device architecture dimensions, and material performances. ZQ reveals an equivalent effect between the heat flux and leg height in determining efficiency. We have shown that ZQ provides a concise guideline to boost the efficiency of heat-concentrated STEGs through engineering the insulation materials, covering materials, heat-concentrated coefficients, and thermoelectric material height, and the efficiency of light-concentrated STEGs by tuning the light-concentrated coefficient, catalyst dose, and aerogel height. As a result, an efficiency enhancement of over five times was achieved in the as-fabricated STEG system. The potential applications of the proposed efficiency model and ZQ in other scenarios with constant heat flux conditions were extensively discussed according to different thermal resistance parameters, including STEGs with different cooling modes, waste heat harvesting from industry operations, photovoltaic–thermoelectric combined systems, etc. Our work highlights the significant progress in bridging between thermal engineering and materials science, advancing the thermoelectric power generation technology.
研究领域:
能源科学
·
材料科学
·
热力学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Chunyu Du,Mei Li,Min Cao,Shasha Song,Shichao Feng,Xipeng Li,Hong Guo,Baoan Li
Thermal-conductive polymer composites have developed to be a hotspot in academic and industrial fields recently. Both efficient heat transport and superior mechanical properties are of critical significance for high-performance thermal-conductive devices. In this paper, magnetic hexagonal boron nitride (mhBN) with excellent interfacial compatibility is successfully synthesized by dopamine and magnetic co-functionalization, and mhBN–poly(vinylidene fluoride) (mhBN–PVDF) composites with a combination of high thermal conductivity and outstanding mechanical property are achieved due to the integration of excellent interfacial interaction and aligned filler architecture into one material’s system. The thermal conductivity increases from 0.35 W/(m K) for the 20 wt % pure BN–PVDF to 0.82 W/(m K) after the dopamine modification and further to 1.43 W/(m K) after alignment. The effective medium approximation model demonstrates that the optimization of mhBN orientation and decrease of thermal resistance are two major factors for the enhancement of thermal conductivity. Moreover, the mhBN–PVDF composites also exhibit excellent tensile strength (168.5 MPa at 15 wt % content) and impact strength (20–30 kJ/m2). The significantly enhanced thermal and mechanical properties result in the excellent heat exchange ability and durability in the heat exchange test, which is important for potential application in the heat exchange industry.
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 MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xian Chang,Zixuan Lv,Hang Yu,Shiyang Li,Guojun Jiang,Congjie Gao,Lixin Xue
Thin Film Composite Polyamide (TFC-PA) Total Heat Exchange Membranes (THEMs) with ultrahigh sensible heat exchange efficiency, high enthalpy exchange efficiency, high CO 2 gas barrier property were successfully prepared by interfacial polymerization between m-phenylenediamine (MPD) and trimesoyl chloride (TMC). The performances of formed THEMs could be greatly impacted by their surface roughness , thickness, surface hydrophilicity, cross-linking degree and counter-ions retention controlled by the MPD concentration, TMC concentration, reaction time and post treatment procedures. Their H 2 O permeation coefficient could be improved by increasing the surface hydrophilicity and decreasing cross-linking degrees of the formed polyamide layers while their CO 2 barrier property could be improved by retaining more counter ions in PA layers. THEMs with ultrahigh sensible heat exchange efficiency of 95%+, high enthalpy exchange efficiency of 60%–65%, greatly improved CO 2 barrier property and superior mechanical strengths could be obtained for potential applications in ERV systems.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2023
·
IF 5.1
Zixuan Lv,Huimin Wang,Shiyang Li,Chaojie Bai,Mingjie Lin,Congjie Gao,Lixin Xue
Thin film nano-composite polyamide (TFN PA) total heat exchange membranes (THEMs) containing ZIF-7, ZIF-8, ZIF-9 and ZIF-67 particles (PTs) introduced during interface polymerization process were prepared. A novel integrated online testing system was established to simultaneously evaluate their CO 2 and moisture exchange rates as well as energy recovery efficiencies. ZIF PTs added in water phase improved the CO 2 barrier property of the THEMs due to their good dispersion in water, the coordination of the excess cations on their surfaces with the –NH 2 groups of MPD from the PA matrix and partially by increasing the PA layer thickness. Addition of ZIF PTs in organic phase showed variety of effects on the CO 2 barrier property of the THEMs depending on their dispersion, structure rigidity, and interaction with the PA polymer matrix. Adding 0.01 g/144 cm 2 of ZIF-67 in aqueous phase and 0.02 g/144 cm 2 of ZIF-9 in organic phase could form TFN membranes with improved CO 2 barrier property without sacrificing energy recovery efficiencies. ZIF-9 addition in organic phase formed ZIF/PA TFN THEMs with the highest total heat recovery rates of 72% and lowest on-line CO 2 exchange rates of 1.7%. The newly obtained online CO 2 exchange rates (h CO2 ) were found to have good correlation with the off-line CO 2 permeance values (PER CO2 ), ηCO 2 = ln (PER CO2 )%-0.005, with a high Pearson's R value of 0.9914. There was also a linear correlation between the permeation selectivity obtained online (DS H2O/CO2 ) and calculated offline (IS H2O/CO2 ), IS H2O/CO2 = 0.289*DS H2O/CO2 +14.4, with an excellent Pearson's R values of 0.9942. The integrated testing system could give more realistic evaluation for novel THEMs with a lot less efforts.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）