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Investigation into the operation of an autothermal two-section subbituminous coal fluidized bed gasifier

International Journal of Coal Science & Technology 2023年第3期10卷 190-203页

作者： Nikolay Abaimov alexander ryzhkov Alexey Dubinin Lu Ding Vladimir Tuponogov Sergey Alekseenko Ural Federal University EkaterinburgRussia 6200022 Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China Institute of Thermophysics Siberian BranchRussian Academy of SciencesNovosibirskRussia 630090

Using a newly developed experimental setup,the features and advantages of an autothermal single-casing atmospheric sub-bituminous coal fluidized bed air-blown gasifier,combining a combustion and gasification section,and mixing the dispersed phase(inert material,char)and heat exchange between them through an annular transfer device,have been *** increase the efficiency of the gasifier,an experimental-computational method was developed find the conditions for optimal operation,combining changing the annular flow's geometry and regulating the primary air for gasification.A simple and reliable multizone thermodynamic calculation model makes it possible to predict the composition of char and syngas in the gasification section with acceptable *** method confirmed that a two-section fluidized bed gasifier can provide efficient gasification of solid fuels and is suitable for use in small-scale cogeneration *** with a heating value of 3.6-4.5 MJ/m^(3)and CGE of 38.2%-42.3%was obtained in the experimental setup without optimizing the primary air flow *** optimization,the indicators increased to the heating value of syngas of 5.20-5.34 MJ/m^(3)and CGE of 42.5%-50.0%.With heat regeneration of 0.8,CGE increases to 70%.

关键词： Coal Syngas Gasification Bubbling fluidized bed Thermodynamics Modeling

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Mobile power generation system based on biomass gasifcation

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International Journal of Coal Science & Technology 2022年第3期9卷 171-184页

作者： Lu Ding Mingming Yang Kai Dong Dai‑Viet N.Vo Douglas Hungwe Jiahan Ye alexander ryzhkov Kunio Yoshikawa Institute of Clean Coal Technology East China University of Science and TechnologyShanghai 200237China Department of Environmental Science and Technology Tokyo Institute of Technology4259 Nagatsuta-choMidori-kuYokohama 226-8503Japan College of Chemistry Chemical Engineering and Material ScienceZaozhuang UniversityZaozhuang 277160China Institute of Environmental Technology and Sustainable Development Nguyen Tat Thanh UniversityHo Chi Minh City 755414Vietnam ZHE JIANG ECO ENVIRONMENTAL TECHNOLOGY CO. LTD.1188The Headquarters of the Free Port H Building 20FWuxing DistrictHuzhou CityZhejiang ProvinceChina Ural Federal University EkaterinburgRussia

Disaster-hit and/or un-electrifed remote areas usually have electricity accessibility issues and an abundance of plant-derived debris and wood from destroyed wooden structures;this can be potentially addressed by employing a decentralized ultrasmall biomass-fed gasifcation power generating *** paper presents an assessment of the technical viability of an ultra-small gasifcation system that utilizes densifed carbonized wood pellets/*** setup was run continuously for 100 h.A variety of biomass was densifed and carbonized by harnessing fugitive heat sources before charging into the *** briquettes and furnished blends exhibited inferior gasifcation performance compared to the carbonized *** the absence of tar blockage problems,steady-state conditions were achieved when pre-treated feedstock was *** steady-state conditions for carbonized pellets gasifcation operated at an equivalence ratio of 0.32,cold gas efciency and carbon conversion achieved 49.2%and 70.5%,*** efciency and maximum power output of 20.3%and 21 kW were realised,*** was found that the system could keep stable while the low heating valve of syngas was over 4 MJ/m^(3)on condition that avoiding tar blocking *** results indicate that the proposed compact ultra-small power generation system is a technically feasible approach to remedy power shortage *** addition,process simulation considering carbonized wood gasifcation combined power generation was formulated to produce syngas and *** pellets with the fow rate of 20 kg/h could generate a 15.18 kW power at the air fow rate of 40 Nm^(3)/h,which is in a good agreement with 15 kW in the 100 h *** is indicated that the gasifcation combined power generation cycle simulated by Aspen simulator could achieve reliable data to assist the complicated experiment operation.

关键词： Small-scale power generation Densifcation Carbonized pellet Carbonized briquette Gasifcation

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Current Status and Future Challenges of Weather Radar Polarimetry: Bridging the Gap between Radar Meteorology/Hydrology/Engineering and Numerical Weather Prediction

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Advances in Atmospheric Sciences 2019年第6期36卷 571-588页

作者： Guifu ZHANG Vivek N.MAHALE Bryan J.PUTNAM Youcun QI Qing CAO ANDrew D.BYRD Petar BUKOVCIC Dusan S.ZRNIC Jidong GAO Ming XUE Youngsun JUNG Heather D.REEVES Pamela L.HEINSELMAN alexander ryzhkov Robert D.PALMER Pengfei ZHANG Mark WEBER Greg M.MCFARQUHAR Berrien MOORE III Yan ZHANG Jian ZHANG J.VIVEKANANDAN Yasser AL-RASHID Richard L.ICE Daniel S.BERKOWITZ Chong-chi TONG Caleb FULTON Richard J.DOVIAK University of Oklahoma NOAA/National Weather Service Enterprise Electronics Corporation NOAA/National Severe Storms Laboratory National Center for Atmospheric Research Raytheon Company Radar Operations Center

After decades of research and development, the WSR-88 D(NEXRAD) network in the United States was upgraded with dual-polarization capability, providing polarimetric radar data(PRD) that have the potential to improve weather observations,quantification, forecasting, and warnings. The weather radar networks in China and other countries are also being upgraded with dual-polarization capability. Now, with radar polarimetry technology having matured, and PRD available both nationally and globally, it is important to understand the current status and future challenges and opportunities. The potential impact of PRD has been limited by their oftentimes subjective and empirical use. More importantly, the community has not begun to regularly derive from PRD the state parameters, such as water mixing ratios and number concentrations, used in numerical weather prediction(NWP) *** this review, we summarize the current status of weather radar polarimetry, discuss the issues and limitations of PRD usage, and explore potential approaches to more efficiently use PRD for quantitative precipitation estimation and forecasting based on statistical retrieval with physical constraints where prior information is used and observation error is included. This approach aligns the observation-based retrievals favored by the radar meteorology community with the model-based analysis of the NWP community. We also examine the challenges and opportunities of polarimetric phased array radar research and development for future weather observation.

关键词： weather radar polarimetry radar meteorology numerical weather prediction data assimilation microphysics parameterization forward operator

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