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Status of an MWth integrated gasification fuel cell powergeneration system in China

International Journal of Coal Science & Technology 2021年第3期8卷 401-411页

作者： Chang Wei Zhien Liu Chufu Li Surinder Singh Haoren Lu Yudong Gong Pingping Li Hanlin Wang Xia Yang Ming Xu Shujun Mu National Institute of Clean-and-Low-Carbon Energy BeijingChina NICE America Research Mountain ViewUSA nexant San FranciscoUSA

Abstract Here,we provide a status update of an integrated gasification fuel cell(IGFC)power-generation system being developed at the National Institute of Clean-and-Low-Carbon in China at the megawatt thermal(MWth)*** system is designed to use coal as fuel to produce syngas as a first step,similar to that employed for the integrated gasification combined ***,the solid-oxide fuel-cell(SOFC)system is used to convert chemical energy to electricity directly through an electrochemical reaction without *** system leads to higher efficiency as compared with that from a traditional coal-fired power *** unreacted fuel in the SOFC system is transported to an oxygencombustor to be converted to steam and carbon dioxide(CO_(2)).Through a heat-recovery system,the steam is condensed and removed,and CO_(2) is enriched and captured for sequestration or *** economic analyses for a typical IGFC system was performed and the results were compared with those for a supercritical pulverized coal-fired power *** SOFC stacks selected for IGFC development were tested and qualified under hydrogen and simulated coal syngas *** results using SOFC stacks and thermodynamic analyses indicated that the control of hydrogen/CO ratio of syngas and steam/CO ratio is important to avoid carbon deposition with the fuel pipe.A 20-kW SOFC unit is under development with design power output of 20 kW and DC efficiency of 50.41%.A 100 kW-level subsystem will consist of 6920-kW power-generation units,and the MWth IGFC system will consist of 59100 kWlevel subsystems.

关键词： Integrated gasification fuel cell(IGFC) Solid oxide fuel cell Stack module Carbon dioxide capture Oxygen-combustor

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Optimized Complex Power Quality Classifier Using One vs. Rest Support Vector Machines

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Energy and Power Engineering 2017年第10期9卷 568-587页

作者： David De Yong Sudipto Bhowmik Fernando Magnago Universidad Nacional de Río Cuarto Río Cuarto Argentina nexant INC Chandler AZ USA

Nowadays, power quality issues are becoming a significant research topic because of the increasing inclusion of very sensitive devices and considerable renewable energy sources. In general, most of the previous power quality classification techniques focused on single power quality events and did not include an optimal feature selection process. This paper presents a classification system that employs Wavelet Transform and the RMS profile to extract the main features of the measured waveforms containing either single or complex disturbances. A data mining process is designed to select the optimal set of features that better describes each disturbance present in the waveform. Support Vector Machine binary classifiers organized in a “One Vs Rest” architecture are individually optimized to classify single and complex disturbances. The parameters that rule the performance of each binary classifier are also individually adjusted using a grid search algorithm that helps them achieve optimal performance. This specialized process significantly improves the total classification accuracy. Several single and complex disturbances were simulated in order to train and test the algorithm. The results show that the classifier is capable of identifying >99% of single disturbances and >97% of complex disturbances.

关键词： Complex Power Quality Optimal Feature Selection One vs. Rest Support Vector Machine Learning Algorithms Wavelet Transform Pattern Recognition

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Short-Term Scheduling of Combined Cycle Units Using Mixed Integer Linear Programming Solution

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Energy and Power Engineering 2013年第2期5卷 161-170页

作者： Juan Alemany Diego Moitre Herminio Pinto Fernando Magnago Department of Electrical & Electronic Engineering National University of Rio Cuarto Rio Cuarto Argentina nexant Inc. Chandler USA

Combined cycle plants (CCs) are broadly used all over the world. The inclusion of CCs into the optimal resource scheduling causes difficulties because they can be operated in different operating configuration modes based on the number of combustion and steam turbines. In this paper a model CCs based on a mixed integer linear programming approach to be included into an optimal short term resource optimization problem is presented. The proposed method allows modeling of CCs in different modes of operation taking into account the non convex operating costs for the different combined cycle mode of operation.

关键词： Combined Cycle Plants Unit Commitment Mixed Integer Linear Programming

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生物塑料将成为重要的生产原料

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现代塑料 2013年第2期 46-47页

作者： Ria Harracksingh nexant能源和化学咨询集团

绿色聚烯烃在生物基聚合物产品组合中，生物基聚乙烯（PE）走在了商业化进程的前列。巴西生产商Braskem正从当地种植的甘蔗中提取乙醇／乙烯，以作为生产绿色PE的原料，其所生产的绿色PE具有与石油基PE一样的性能。作为世界最大的生物... 详细信息

绿色聚烯烃在生物基聚合物产品组合中，生物基聚乙烯（PE）走在了商业化进程的前列。巴西生产商Braskem正从当地种植的甘蔗中提取乙醇／乙烯，以作为生产绿色PE的原料，其所生产的绿色PE具有与石油基PE一样的性能。作为世界最大的生物塑料生产商之一，Braskem在其Triunfo工厂中拥有年产200000t生物基PE的产能。该工厂于2010年9月正式投产，

关键词：生物塑料生产原料商业化进程产品组合聚乙烯生产商 PE 聚烯烃

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Advanced Syngas Upgrading Process for Conversion of Low-Rank Coals to Liquid Fuels

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Journal of Geological Resource and Engineering 2016年第5期4卷 210-217页

作者： Andrew Lucero Amit Goyal Kevin McCabe Gerald Choi Haoren Lu Santosh Gangwal Southern Research 5201 International Dr. Durham NC 27712 USA nexant Inc. 101 2nd Street lOth Floor San Francisco 94105 CA

Syngas cleanup is a major challenge in any coal or biomass gasification application. A modified syngas cleanup process is under development to improve syngas from low rank coals for CTL （coal to liquids） applications. Novel steam reforming catalysts were developed to convert tars and light hydrocarbons and decompose ammonia in the presence of syngas contaminants such as H2S （〈 500 ppm）. Process goals are to improve syngas yield and H2：CO ratio while reducing water gas shift and downstream gas cleanup requirements. Laboratory reforming experiments were focused on developing information to support a techno-economic analysis using TRIG （transport reactor integrated gasifiers） or LURGI gasifiers. A CTL with carbon capture model was developed to compare the economics of the new process including the catalytic steam reforming to DOE （Department of Energy） baseline CTL. Reforming catalysts were developed that had high methane, tar, and ammonia conversion in presence of 90 ppm H2S. Higher concentrations of H2S affected conversion of methane but catalyst performance was fairly stable for the duration of testing. Results of modeling indicated that economics of the new process were nearly identical to the baseline CTL case, but greenhouse gas emissions for a given production of fuels were approximately 50% lower.

关键词： Steam reforming CTL gasifier syngas cleanup Fischer-Tropsch.

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Dynamic Optimization of Bioprocesses

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Applied Mathematics 2012年第10期3卷 1487-1495页

作者： George Koumpouras Cleo Kontoravdi Centre for Process Systems Engineering Department of Chemical Engineering Imperial College London South Kensington Campus London UK nexant Limited 1 King’s Arms Yard London UK

The Bioprocessing industry delivers high-value protein-based pharmaceutical products produced using microbial or animal cells. Animal cell culture, the only method currently available for the production of proteins with human-like post-translational modifications, is an expensive and labor-intensive process, as animal cells have complex nutrient requirements. Optimization studies have typically been limited to experimental studies, although there has recently been increased interest in combined experimental and computational approaches. In this work, we present the results of a dynamic optimization approach to improving animal cell bioprocesses. We have based this on a model validated over batch and fed-batch conditions and have examined four possible objective functions. Our results indicate that the maximization of the product concentration or the integral of viable cell concentration over time give equivalent results and can improve the product titer up to 70% over non-optimized fed-batch cultures.

关键词： Animal Cell Culture Antibody Production Dynamic Optimization

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