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Transactions of The Institution of Chemical Engineers
Hemisphere Pub. Corp. [distributor]
Transactions of The Institution of Chemical Engineers

Hemisphere Pub. Corp. [distributor]

0957-5820

Transactions of The Institution of Chemical Engineers/Journal Transactions of The Institution of Chemical Engineers
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    Subway air quality modeling using improved deep learning framework

    Xiaoan YanDuanwu YangJinyong Wang
    11页
    查看更多>>摘要：Soft-sensing modeling of indoor air quality in subways is critical for public health.For the purpose of reducing monitoring costs and building health risk assessment models,a new deep learning forecasting model based on empirical mode decomposition,long short-term memory(LSTM)block and squeeze and excitation networks(SENet)is proposed.To begin,the original PM_(2.5)data is decomposed into multiple sub-series with varying frequencies using empirical mode decomposition.Then,an LSTM neural network is built to forecast the new sub-series.Finally,squeeze and excitation networks were constructed and coupled to automatically pick informative weights to obtain the real-time forecasting result.The proposed model is compared to other commonly used models such as convolutional neural network and LSTM for its ability to forecast PM_(2.5)on an hourly experiment.The proposed model outperforms reference models in terms of forecasting performance,owing to its ability to capture informative characteristics and temporal patterns from varying PM_(2.5)dataset.The mean square error is improved by 38.29% and 29.21% compared with convolutional neural network and LSTM,respectively.When compared to convolutional neural networks and LSTM,the mean absolute error is reduced by 22.93% and 13.38%,respectively.Moreover,the proposed model also performs best in health risk warning assessment.
      原文链接:
    • NSTL

    Novel thin-film nanocomposite membranes with crosslinked polyvinyl alcohol interlayer for Perfluorinated Compounds(PFCs)removal

    Rui Qi
    8页
    查看更多>>摘要：Conventional polyamide-based interface polymerized nanofiltration(NF)membranes exhibit trade-off characteristics between water permeability and salt selectivity.The introduction of nanomaterial interlayers into thin-film composite(TFC)membranes is expected to overcome the limitation.Herein,a novel membrane was constructed via coating a polyvinyl alcohol(PVA)interlayer on the PES supporting film.Trace amounts of MXene nanosheets were used to form a barrier to avoid the occupancy of large pores by PVA.Scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),Raman spectra,water contact angle(WCA),zeta potential,and other characterizations were used to evaluate the chemical and physical properties of the prepared membranes.Due to the PVA hydrophilicity,the composite membranes achieved higher hydrophilicity.Besides,the electronegativity enhancement and roughness improvement facilitate the film to have better application prospects.At the lab scale,the optimized membranes achieved a high-water flux of 22.8 L m~(-2)h~(-1)bar1 and a 94.5% MgSO4 rejection.The typical kinds of PFCs,including PFOA,PFOS,PFHxA and PFBA,were quantitatively evaluated and analyzed by electrostatic interaction.The excellent performance was maintained in the case of environmental changes owing to the stableness of the PVA interlayer.This study provides a new avenue for fabricating robust NF membranes for actual production.
      原文链接:
    • NSTL

    Numerical simulation of heat transfer performance of different heat exchange tubes in heat recovery steam generator

    Haibo GaoYuqiu ZhangYongqi Liu
    7页
    查看更多>>摘要：For the purpose of reducing the cost of hydrogen production in process engineering and practice and enhancing the heat exchange efficiency of heat recovery steam generator,a new spring-blade mixed heat exchange tube was creatively put forward,and the performance evaluation criterion(PEC)was used as evaluation index of comprehensive heat transfer performance.To explore the heat transfer performance,the velocity distribution,temperature distribution,pressure distribution and comprehensive heat transfer performance were analyzed,and heat transfer coefficient and the value of PEC were obtained.The addition of spring and blade in the mixed heat exchange tube has obvious positive impacts on the velocity,temperature and pressure drop.In the Reynolds number range of 20000-40000,the heat exchange coefficient increment of the mixed heat exchange tube is increased by 35% and 45% than that of the spring and blade heat exchange tube respectively.The pressure drop is positively correlated with the heat exchange coefficient,and its increase leads to the decrease of PEC value.
      原文链接:
    • NSTL

    Synthesis,evaluation,and optimal stability of a biowaste-based catalytic oxidative desiilfurization of model fuel in a trickle bed reactor

    Hiba R.MohammedSaba A.GheniKhaleel I.Hamad
    15页
    查看更多>>摘要：Oxidative Desiilfurization(ODS)is one of the promising alternative processes.However,the lifetime of the ODS catalysts is an issue that restricted the use of the process.In this work,Activated Carbon(AC)prepared from biowaste(apricot stones(AS))was impregnated with Mn and coated with aluminum oxide to prolong the lifetime of the ODS process.To evaluate the performance of the prepared catalysts for a continuous three-phase ODS process,a trickle bed reactor(TBR)was used to conduct the ODS process at mild oxidation temperatures.The ODS evaluation study was conducted under different temperatures(60 and 70 ℃),LHSVs(1,1.35,2,and 4 h~(-1)),pressures(6 and 800 kPa),and initial sulfur concentrations(100 and 300 ppm).Both coated and uncoated catalysts showed high removal efficiency of the n-butyl mercaptan in the TBR.The maximum conversions obtained were 97.29 % and 95.19 % for the coated and uncoated Mn/AC catalysts at T = 70 ℃,P = 800 kPa,LHSV= 1 hr~(-1),and initial sulfur concentration= 300 ppm.Besides the high performance,the coated Mn/AC showed outstanding stability during the continuous oxidation process.A kinetic model was formulated for the ODS process for the estimation of kinetic parameters of the high stability process.gPROMS has been used for modeling,simulation,and parameter estimation via optimization.The simulation results showed good consistency with the experimental data of all lumps with an absolute average error of up to 5 % and the optimization resulted in the optimal kinetics parameters of the high stability ODS process
      原文链接:
    • NSTL

    Corrosion mechanism of high temperature and O2 content in steamed CO2/O2/SO2 system and failure behavior of 20G steel on steam-injection pipelines

    Kexi LiaoGuoxi HeQing Zou
    15页
    查看更多>>摘要：The corrosion mechanism and failure behavior of 20 G steel in steamed CO2/O2/SO2 environment(7.8 MPa,100-301 ℃)are studied.The surface characterization technology is adopted to analyze the corrosion rate and the microscopic morphology of corrosion product film,where the corrosive influencing factors are determined.The influence of temperature on the film formation kinetics is greater than that of cathodic reaction thermodynamics,wherein the corrosion product film has good performance for anti-corrosion.The interaction between H~+ and Cl~-leads to the degradation of mechanical properties.The residual-life evaluation model is proposed to recommend the reinspection period of the steam injection pipeline.
      原文链接:
    • NSTL

    A multiagent-based modeling approach for emergency evacuation plan optimization during toxic gas releases within chemical plants

    Chaoying LiJie HouWuyi Cheng
    15页
    查看更多>>摘要：It is essential to minimize the gas exposure risk during evacuation in the event of toxic gas releases.This study uses a multiagent-based model to simulate the evacuation processes of a chemical plant and surrounding residential areas.An evaluation and optimization method for evacuation plans was proposed.A risk assessment model for ambient evacuation was established,and the evacuation plan optimization process was proposed.Using a chemical plant in Tianjin,China,as an example,the evacuation scenario of workers and surrounding residents after liquid ammonia release was simulated,and the effectiveness of the optimization strategies for the original evacuation plan is verified.The results reveal that using optimization strategies dramatically reduces the gas exposure risk during evacuation.The gas exposure risk during evacuation of some evacuation sub-areas is reduced by optimizing the evacuation route.Meanwhile,issuing the evacuation order sooner and optimizing the warning diffusion model exerts an excellent risk reduction effect on areas with low ammonia concentrations.Evacuation optimization strategies suitable for different evacuation sub-areas are not the same.They need to be determined according to the real situations of the evacuation sub-areas.The results can help facilitate decisionmaking for the formulation and optimization of emergency plans for toxic gas releases.
      原文链接:
    • NSTL

    Role of refuse-derived fuel in circular economy and sustainable development goals

    Nabila ShehataKhaled ObaideenEnas Taha Sayed
    16页
    查看更多>>摘要：Refused derived fuel(RDF)is one of die products of die MSWs that is effectively used as an energy source,especially in the cement industry.This work discusses the role of the RDF in the achievement of the United Nations Sustainable Development Goals(SDGs)and the circular economy.Moreover,the barriers that challenge the widespread of the RDF are indicated.The RDF positively contributes to the most SDGs.However,the main contribution would be in SDG 1: no poverty,SDG 3: good health and well-being,SDG 6: SDG 6: clean water and sanitation,SDG 7: affordable and clean Energy,SDG 8 decent work and economic growth,SDG 9: industry,innovation and infrastructure,SDG 11: sustainable cities and communities,SDG 12: responsible consumption and production,SDG 14: life below water and SDG 15: life on land.While in the main contribution of the circular economy comes from its ability to reuse municipal solid wastes,industrial solid waste,non-recyclable plastics,waste tires,biomass,paper/card,waste oils,and waste textiles.In addition,RDF will reduce the CO2 by up to 2155.3 106 Kt CO2/year and recover heat content from 2 to 5.5 Gcal/t.Moreover,the RDF will save up to 15% of the fuel that equals 4.92 tons/h.Such fuel reduction will save 486 USD/h in petcoke costs,with 2.27 tons/h of CO2 being emitted into the atmosphere at a net saving of 389 USD/h.The results guide academic researchers,policymakers,and stakeholders worldwide to evaluate solid wastes as alternative fuels concerning their overall sustainability and cheapness.Moreover,this work introduces some future research directions to involve solid wastes in circular economy and SDGs.Furthermore,a set of indicators are proposed to guide the stakeholder to increase the RDF contribution to SDGs and lower the possible trade-off.
      原文链接:
    • NSTL

    Probabilistic approach for risk assessment of of fshore hydrate wellbore during test production

    Shengyu JiangGuoming ChenYuan Zhu
    11页
    查看更多>>摘要：The problem of wellbore risk due to complicated phase variation in coupled seepage in the process of hydrate production is one of a major obstacle restricting its commercial production.In response to this problem,a hybrid methodology for evaluating the risk of of fshore hydrate test production wellbore is proposed using self-developed Particle Filter(PF)model,which realizes risk update through measurement data based on physical model.In this study,the physical model is constructed by a multi-field coupling model and the corresponding algorithm.The monitoring data is generated by Monte Carlo simulation to illustrate the method application.Then the probability prediction curve of the shear failure of the sediment around the wellbore can be calculated based on the PF.Finally,a novel dynamic risk matrix is developed to evaluate the risk of the current hydrate wellbore.A case study using geological parameters of hydrate sediments in the Shenhu area of the South China Sea was presented to illustrate the application of the proposed framework.Results indicated that the remaining safe production time at 90 days is between 210 days and 280 days,with a pressure drop of 3.0 MPa and 0.75 as the threshold.Subsequently,a dynamic risk matrix diagram of the risk of the hydrate wellbore is proposed based on Event Sequence Diagram(ESD)and Bayesian Network(BN).The result shows that the risk of abandonment caused by landslides should be prevented in the early stage,and the workover risk caused by damage to the wellbore structure should be paid special attention to in the middle and late stages.The proposed methodology can provide applied technology for wellbore risk management in the process of hydrate test production.
      原文链接:
    • NSTL

    Circular economy-based environmental management using biochar: Driving towards sustainability

    Ekta SinghRahul MishraAman Kumar
    16页
    查看更多>>摘要：There is a growing interest in developing"circular economy"with the major goal of eliminating waste by appropriate planning.Biochar has recently gained popularity in the environmental sector as a versatile material for waste reduction and increasing the efficacy of the circular economy.It has demonstrated possibilities towards environmental impact,battling climate change,and creating an efficient circular economy model.Despite these positive prognoses,research on biochar's benefits is still widely ongoing.This is interrelated to the biochar's inherent properties that are deeply impacted by certain variables like feedstock types and treatment conditions.In this review,the conversion of waste into biochar and its application in different regions have been discussed while considering the CE.It discusses how waste materials are upcycled to make biochar and then used towards betterment of the environment.It highlights how biochar can be produced from different wastes and can be used in agriculture,wastewater treatment,anaerobic digestion and various other sectors thereby proving its multidimensional role towards protection of the environment and successfully building up a circular economy based environmental management model.This finally ends up closing the loop thereby demonstrating an actual circular economy.
      原文链接:
    • NSTL

    Simulation study on gas-bearing dust and its application combined with air curtain in development heading,a case study

    Gang ZhouBin JingZhuo Xu
    12页
    查看更多>>摘要：In view of the problems caused by the overrun of gas and dust in the tunneling process of 7703 rock roadway in Zouzhuang Coal Mine,the risk control technology research was carried out by combining numerical analysis,research and development of new automatic wall-attached duct and field test,and the dust closed control within low gas concentration was realized.The results show that the gas concentration in the local area exceeded the legal or regulation limit of 1% under the conditions of forced ventilation,axial-to-radial flow ratio 1:9 and 2:8 mixed ventilation.When the axial-to-radial flow ratios were 3:7 and 4:6,the gas concentration was low,approximately _(0.5)%.Additionally,when the axial-to-radial flow ratio was 4:6,the dust concentration was still maintained at approximately 150 mg/m3 until 20 m away from the head.When the axial-to-radial flow ratio was 3:7,the dust pollution was effectively controlled.At approximately 17 m from the head,the average dust concentration was gradually brought lower than 4 mg/m3.
      原文链接:
    • NSTL