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Partition method for improvement of piecewise linear model with full envelope covered

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航空动力学报 2016年第12期31卷 3042-3053页

作者： YANG Shu-bo WANG Xi LONG Yi-fu LI Zhi-peng HU Zhong-zhi YIN Kai ZHANG Rong School of energy and Power Engineering Beijing University of Aeronautics and Astronautics commercial Aircraft Engine Company Limited Aero Engine(Group)Corporation of China

Since ambient conditions vary in a wide range within the full flight envelope,the existing piecewise linear model(PLM),which is based on sea-level static condition with use of corrected parameters for other points in the flight envelope,cannot meet the accuracy for replacing the nonlinear *** obtain more accurate linear models,a method of partitioning the flight envelope over a grid of Mach number and altitude boxes was ***,a set of linear models for a given operating condition was selected by picking the nearest(Mach number,altitude)box in the flight *** the selected set of linear models,interpolating for power level based on a weighted sum of corrected rotor speeds can obtain a linear model with acceptable *** results of different points within the full flight envelope showed that the maximum error between nonlinear model and the existing PLM was more than 50%,while the maximum error between nonlinear model and the improved PLM was within 8%.It is concluded that the improved PLM performs accurately,especially under the non-standard *** addition,the improved PLM can satisfy the real-time requirement better than the existing PLM.

关键词： piecewise linear model partition full envelope parameter schedule turbofan engine

Anaerobic-aerobic processes for the treatment of textile dyeing wastewater containing three commercial reactive azo dyes:Effect of number of stages and bioreactor type

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Chinese Journal of Chemical Engineering 2021年第11期34卷 228-239页

作者： Banafsheh Azimi Elham Abdollahzadeh-Sharghi Babak Bonakdarpour Chemical Engineering Department Amirkabir University of TechnologyTehranIran Environmental group Energy DepartmentMaterials and Energy Research CenterAlborzIran

In this study,the effect of number of stages and bioreactor type on the removal performance of a sequential anaerobic-aerobic process employing activated sludge for the treatment of a simulated textile dyeing wastewater containing three commercial reactive azo dyes was *** stage processes performed better than one stage ones,both in terms of overall organic and color removal,as well as the higher contribution of anaerobic stage to the overall removal performance,thereby making them a more energy efficient *** employment of a moving bed sequencing batch biofilm reactor,which uses both suspended and attached biomass,for the implementation of the anaerobic stage of the process,was compared with a sequencing batch reactor that only employs suspended *** results showed that,although there was no meaningful difference in biomass concentration between the two bioreactors,the latter reactor had better performance in terms of chemical oxygen demand(COD)removal efficiency and rate and color removal *** exploratory tests revealed a difference between the roles of suspended and attached bacterial populations,with the former yielding better color removal whilst the latter had better COD removal *** sequential anaerobic–aerobic process,employing an aerobic membrane bioreactor in the aerobic stage resulted in COD and color removal of 77.1±7.9%and 79.9±1.5%,*** incomplete COD and color removal was attributed to the presence of soluble microbial products in the effluent and the autoxidation of dye reduction metabolites,***,aerobic partial mineralization of the dye reduction metabolites,was experimentally observed.

关键词： Wastewater Anaerobic Aerobic Anaerobic moving bed sequencing batch biofilm reactor Anaerobic sequencing batch reactor Aerobic membrane bioreactor

Parametric optimisation of two Pelton turbine runner designs using CFD

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Journal of Hydrodynamics 2015年第3期27卷 403-412页

作者： IDONIS Audrius PANAGIOTOPOULOS Alexandros AGGIDIS George A. ANAGNOSTOPOULOS John S. PAPANTONIS Dimitris E. Lancaster University Renewable energy group and Fluid Machinery group Engineering Department Lancaster University School of Mechanical Engineering National Technical University of Athens

This paper aims to develop a generic optimisation method for Pelton turbine runners using computational fluid dynamics （CFD）. Two different initial runners are optimised to achieve more generic results. A simple bucket geometry based on existing bibliography is parameterised and initially optimised using fast Lagrangian solver （FLS）. It is then further optimised with a more accurate method using ANSYS Fluent. The second geometry is a current commercial geometry with good initial performance and is optimised using ANSYS CFX. The analytical results provided by CFX and Fluent simulations are used to analyse the characteristics of the flow for different runner geometries.

关键词： hydropower Pelton impulse turbines numerical modelling bucket geometry parameterisation optimisation

Performance test of a 5 kW solid oxide fuel cell system under high fuel utilization with industrial fuel gas feeding

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International Journal of Coal Science & Technology 2021年第3期8卷 394-400页

作者： Ming Xu Hanlin Wang Mingxian Liu Jianning Zhao Yuqiong Zhang Pingping Li Mingliang Shi Siqi Gong Zhaohuan Zhang Chufu Li National Institute of Clean-and-Low-Carbon energy Beijing 102209China Shenhua new energy Company LtdBeijing 100007China Coal To Oil Branch Company Ningxia Coal Industry GroupYinchuan 750411China

As the demand for green energy with high efficiency and low carbon dioxide(CO2)emissions has increased,solid oxide fuel cells(SOFCs)have been intensively developed in recent *** gasification fuel cells(IGFCs)in particular show potential for large-scale power generation to further increase system ***,for commercial application of IGFCs,it is important to design reliable multi-stacks for large systems that show long-term stability and practical fuel gas for application to industrial *** this work,a test rig(of a 5 kW SOFC system,with syngas from industrial gasifiers as fuel)was fabricated and subjected to long-term tests under high fuel utilization to investigate its *** maximum steady output power of the system was 5700 W using hydrogen and 5660 W using syngas and the maximum steady electrical efficiency was 61.24%while the fuel utilization efficiency was 89.25%.The test lasted for more than 500 h as the fuel utilization efficiency was larger than 83%.The performances of each stack tower were almost identical at both the initial stage and after long-term *** 500 h operation,the performances of the stack towers decreased only slightly under lower current and showed almost no change under high *** results demonstrate the reliability of the multi-stack design and the prospect of this SOFC power-generation system for further enlarging its application in a MWth demonstration.

关键词： Solid oxide fuel cell(SOFC) Integration gasification with fuel cell(IGFC) Gasification Stack tower

Recent advances on quasi-solid-state electrolytes for supercapacitors

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Journal of energy Chemistry 2022年第4期31卷 697-717页

作者： Murilo M.Amaral Raissa Venâncio Alfredo C.Peterlevitz Hudson Zanin Advanced energy Storage Division Center for Innovation on New EnergiesCarbon Sci-Tech Labs and Manufacturing GroupSchool of Electrical and Computer EngineeringUniversity of CampinasCampinasSP 13083-852Brazil

Solid-state and quasi-solid-state electrolytes have been attracting the scientific community’s attention in the last decade. These electrolytes provide significant advantages, such as the absence of leakage and separators for devices and safety for users. They also allow the assembly of stretchable and bendable supercapacitors. Comparing solid-state to quasi-solid-states, the last provides the most significant energy and power densities due to the better ionic conductivity. Our goal here is to present recent advances on quasisolid-state electrolytes, including gel-polymer electrolytes. We reviewed the most recent literature on quasi-solid-state electrolytes with different solvents for supercapacitors. Organic quasi-solid-state electrolytes need greater attention once they reach an excellent working voltage window greater than 2.5 ***, aqueous-based solid-state electrolytes have a restricted voltage window to less than 2 V. On the other hand, they are easier to handle, provide greater ionic conductivity and capacitance. Recent water-in-salt polymer-electrolytes have shown stability as great as 2 V encouraging further development in aqueous-based quasi-solid-state electrolytes. Moreover, hydrophilic conductive polymers have great commercial appeal for bendable devices. Thus, these electrolytes can be employed in flexible and bendable devices, favoring the improvement of portable electronics and wearable devices(376 references were evaluated and summarized here).

关键词： Quasi-solid-state electrolyte Gel-polymer electrolyte Flexible supercapacitor Wearables

Influence of the Feed Gas Composition on the Fischer-Tropsch Synthesis in commercial Operations

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Journal of Natural Gas Chemistry 2007年第4期16卷 329-341页

作者： Theo Lee R & D Center Headwaters Technologies Innovation group 1501 New York AvenueTrentonNew JerseyUSA

Key technical challenges relating to the Fischer-Tropsch （F-T） synthesis applied in the commercialization of coal/gas-to-liquids （CTL/GTL） technologies have been reviewed. Based on the experiences accumulated from pilot plant, semi-work test and lab researches, the influences of the H2/CO ratio and the CO2 in the feed gas on the F-T process as well as on CTL/GTL complex in terms of product yields, energy efficiency and carbon utilization efficiency have been studied. Being contrary to the current design schemes for F-T process using the coal derived syngas and the iron-based cata lyst, it is suggested to feed the F-T synthesis unit with a syngas having a H2/CO ratio of 0.5 and then adjusting to 1.4 via the recycling process. As a result, the carbon efficiency of the whole plant could be reached to as high as 50%. For the issue of CO2 addition to the feed gas, it is proved that only a diluting role is played under the current commercial slurry phase F-T process.

关键词： Fischer-Tropsch synthesis gas-to-liquids feed gas composition, carbon efficiency

A Conditional Generative adversarial Network for energy use in multiple buildings using scarce data

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energy and AI 2021年第3期5卷 119-132页

作者： Gaby Baasch Guillaume Rousseau Ralph Evins energy and Cities group Department of Civil EngineeringUniversity of VictoriaCanada

Building consumption data is integral to numerous applications including retrofit analysis,Smart Grid integration and optimization,and load ***,due to technical limitations,privacy concerns and the proprietary nature of the industry,usable data is often unavailable for research and *** adversarial networks(GANs)-which generate synthetic instances that resemble those from an original training dataset-have been proposed to help address this *** studies use GANs to generate building sequence data,but the models are not typically designed for time series problems,they often require relatively large amounts of input data(at least 20,000 sequences)and it is unclear whether they correctly capture the temporal behaviour of the *** this work we implement a conditional temporal GAN that addresses these issues,and we show that it exhibits state-of-the-art performance on small datasets.22 different experiments that vary according to their data inputs are benchmarked using Jensen-Shannon divergence(JSD)and predictive forecasting validation *** these,the best performing is also evaluated using a curated set of metrics that extends those of previous work to include PCA,deep-learning based forecasting and measurements of trend and *** case studies are included:one for residential and one for commercial *** model achieves a JSD of 0.012 on the former data and 0.037 on the latter,using only 396 and 156 original load sequences,respectively.

关键词： Generative adversarial network Building load profile Machine learning Data scarcity

Reserve Constrained Dynamic Economic Dispatch with Valve-point Effect:A Two-stage Mixed Integer Linear Programming Approach

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CSEE Journal of Power and energy Systems 2017年第2期3卷 203-211页

作者： Zhaolong Wu Jianying Ding Q.H.Wu Zhaoxia Jing Jiehui Zheng School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China Power Generation commercial Division Guangdong Yudean Group Co.LTDGuangzhou 510630China

This paper proposes a deterministic two-stage mixed integer linear programming(TSMILP)approach to solve the reserve constrained dynamic economic dispatch(DED)problem considering valve-point effect(VPE).In stage one,the nonsmooth cost function and the transmission loss are piecewise linearized and consequently the DED problem is formulated as a mixed integer linear programming(MILP)problem,which can be solved by commercial *** stage two,based on the solution obtained in stage one,a range compression technique is proposed to make a further exploitation in the subspace of the whole solution *** to the linear approximation of the transmission loss,the solution obtained in stage two dose not strictly satisfies the power balance ***,a forward procedure is employed to eliminate the *** simulation results on four test systems show that TSMILP makes satisfactory performances,in comparison with the existing methods.

关键词： Dynamic economic dispatch mixed integer linear programming valve-point effect spinning reserve transmission loss non-convex optimization

Investigation on and industrial application of degrading of methanol feed in methanol to propylene process

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Chinese Journal of Chemical Engineering 2018年第10期26卷 2102-2111页

作者： Lixiang Jiang Chufu Li Ming Xu Aihua Xing Rui Feng Jianjun Wu China University of Mining and Technology Xuzhou 221116 China China energy Investment Corporation Limited Beijing 100011 China Shenhua Ningrnei Coal group Coal Chemical Industry Company Yinchuan 750411 China National Institute of Clean-and-Low-Carbon energy Beijing 102209 China

At present, methanol to propylene(MTP) technology developed by Lurgi Company is adopted for commercial plants and refined methanol with the purity ≥99.85 wt% is required as the feed of MTP unit in Lurgi's ***, high energy cost for refined methanol production is one of the bottlenecks to improve the economy of MTP technology. Reducing the grade of feed refined methanol may be an effective method to save energy and reduce operation costs in MTP process. In this work, experiments and process simulation were carried out to investigate the influence and feasibility of degrading the methanol feed. Experiments were conducted to investigate the influence of crude methanol feed on conversion and selectivity of MTP reaction as well as the performance of ZSM-5 catalyst. The experimental results showed that degrading the methanol feed had no obvious influence on the conversion and selectivity of MTP reactions and the catalyst deactivation was caused by the carbon accumulation and metals deposition on the active sites. The process simulation results showed that the influence on the conversion and selectivity as well as the stream load of MTP process was negligible if 98 mol% methanol was used as feed. Finally, industrial experiments were conducted by adjusting the operation parameters to degrade of feed methanol of the commercial 500 kt·a^(-1) MTP unit of Ningmei group in China. The results of industrial application illustrated that annually 180 kt fuel coal and 150 kt desalted water as well as 1770 MW·h^(-1) electricity would be saved when the water content increased from 0.01% to 0.4%. This work has identified the feasibility to improve MTP technology by degrading the methanol feed.

关键词： MTP Methanol Distillation Simulation and optimization energy saving