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Numerical simulation of acoustic wake effect in acoustic agglomeration under Oseen flow condition

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Science Bulletin 2012年第19期57卷 2404-2412页

作者： ZHANG GuangXue1,LIU JianZhong2,WANG Jie2,ZHOU JunHu2 & CEN KeFa2 1 institute for energy engineering,china Jiliang University,Hangzhou 310018,china 2 institute for thermal Power engineering,Zhejiang University,Hangzhou 310027,china institute for energy engineering China Jiliang University Hangzhou 310018 China institute for thermal Power engineering Zhejiang University Hangzhou 310027 China

We numerically simulate the hydrodynamic interaction of aerosol particles due to the acoustic wake effect under the Oseen flow *** is found for two nearby particles with an orientation angle of 0 to 50° with respect to the acoustic field,and weak repulsion is found outside this *** agreement is obtained between the numerical results and experiments in the *** study the influence of particle size,sound wave frequency and the particle *** result shows that the acoustic wake effect plays a significant role in acoustic *** could be either the major agglomeration mechanism of monodisperse aerosols or the major refill mechanism for polydisperse aerosols to supplement orthokinetic interaction.

关键词： acoustic agglomeration aerosol particle hydrodynamic interactions acoustic wake effect Oseen region

A Cold Model Experimental Study on the Flow Characteristics of Bed Material in a Fluidized Bed Bottom Ash Cooler in a CFB Boiler

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Journal of thermal Science 2000年第4期9卷 381-384页

作者： Lu Xiaofeng,Li Yourong (institute of thermal energy engineering, Chongqing University, Chongqing, 400044, china) institute of thermal energy engineering Chongqing University Chongqing China

A cold model experimental study on the flowing characteristics of bed material between a fluidized bed ash cooler and a furnace of CFB boiler were discussed in this paper. The research results showed that flowing status of the bed material in a bubbling bed, which was run with a circulating fluidized bed together in parallel operation, was influenced by the pressure difference between the CFB and the bubbling bed, the switch status of unlocking air, and the structure of the exit of the bubbling bed. There was a circulating flow of bed material between CFB and bubbling bed.

关键词： fluidized bed CFB bottom ash cooler.

thermal CONDUCTIVITY OF THF CLATHRATE HYDRATE FROM 243 K TO 263 K

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化工学报 2003年第Z1期54卷 71-75页

作者： HUANG Duzi~(1,2) and FAN Shuanshi~1(~1Center for Gas Hydrate, Guangzhou institute of energy Conversion, CAS, Guangzhou, 510070, Guangdong, china ~2 department of thermal Science & energy engineering, USTC, Hefei, 230036, Anhui, china) Center for Gas Hydrate Guangzhou Institute of Energy Conversion CAS Guangzhou 510070 Guangdong China department of thermal Science & energy engineering USTC Hefei 230036 Anhui China Center for Gas Hydrate Guangzhou Institute of Energy Conversion CAS Guangzhou 510070 Guangdong China

Using transient plane source technique, we measured THF hydrate thermal conductivity from 243 K to 263 K. The sample THF solution is over saturated in order to avoid the effect of ice. And also to avoid the effect of crystal anisotropy, the THF hydrate was crushed to measure. In the test temperature value increases with the temperature increasing.

关键词： THF in or it thermal CONDUCTIVITY OF THF CLATHRATE HYDRATE FROM 243 K TO 263 K of that

Analysis on ignition and extinction of n-heptane in homogeneous systems

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Science china(Technological Sciences) 2005年第5期48卷 556-569页

作者： LIU Yongfeng1 & PEI Pucheng2 1. Mechanical and Electrical engineering department, Beijing institute of Civil engineering and Architec-ture, Beijing 100044, china 2. State Key Laboratory of Automotive Safety and energy, Tsinghua University, Beijing 100084, china 1. Mechanical and Electrical engineering department Beijing Institute of Civil Engineering and Architecture 100044 Beijing China 2. State Key Laboratory of Automotive Safety and energy Tsinghua University 100084 Beijing China

To calculate ignition delay times, the governing equations about species and temperature, which are in a closed volume based on the theory of thermal explosion and in a continuously stirred flow reactor, are deducted. The method referred to steady state assumptions is based on the observation that due to very fast chemical processes in combustion problems many chemical species and reactions are in a quasi-steady state or partial equilibrium. When a species is assumed to be in the steady state, the corresponding differential equation can be replaced by an algebraic relation, which reduces the computational costs. The steady state solution of the reactor equations describes the three ignition temperature regimes and get “S-shaped curve”. The reduced simplified 4-step mechanism for n-heptane from 1011 elementary reactions leads with the steady state assumptions to linear differential equations, which is solved. The simulation results of the 4-step reduced mechanism for n-heptane are fitted well with the experiment data. At last, two important parameters are discussed thoroughly and the temperature perturbation is given. It reduces the computational efforts considerably without losing too much accuracy and further supplies numerical methods for turbulent combustion in the diesel engine.

关键词： ignition delay times, thermal runaway, steady state assumptions, continuously stirred flow reactor.

Research and Development on PFBC-CC in china and Jiawang Pilot Plant Project

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Journal of thermal Science 1994年第3期3卷 205-210页

作者： Ningsheng Cai Mingyao Zhang Dan Li Wenting Fu (thermal energy engineering Research institute, Southeast University, Nanjing 210096, china) 1. thermal energy engineering Research institute Southeast University 210096 Nanjing China

Pressurized Fluidized Bed Combustion(PFBC) is recognized as an advanced coal-fired technology which can improve efficiency in combined cycle scheme and reduce environmental pollution. Progressive status on PFBC-CC in china is presented in this paper. Test results on a 1 MWt bench scale experimental PFBC facility is reviewed briefly. Based on retrofitting of an old steam power plant located at Jiawang,a project to construct a PFBC-CC pilot plant is under way. Designed capacity of the pilot plant is about 15 MWe, 3 MWe from gas cycle and 12 MWe from steam cycle. The system configuration, main design parameters, estimated technical performance as well as construction schedule of the pilot plant are described. The bright future for PFBC-CC in china is also indicated.

关键词： pressurized fluidized bed combustion combined cycle pilot plant

Emission characteristics of dioxins,furans and polycyclic aromatic hydrocarbons during fluidized-bed combustion of sewage sludge

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Journal of Environmental Sciences 2009年第12期21卷 1747-1752页

作者： DENG Wenyi, YAN Jianhua, LI Xiaodong, WANG Fei, CHI Yong, LU ShengyongState Key Laboratory of Clean energy Utilization, institute for thermal Power engineering, Zhejiang University, Hangzhou 310027, china. [a] State Key Laboratory of Clean energy Utilization Institute for Thermal Power Engineering Zhejiang University Hangzhou 310027 China

Pre-dried sewage sludge with high sulfur content was combusted in an electrically heated lab-scale fluidized-bed incinerator. The emission characteristics of polychlorinated dibenzo-p-dioxins （PCDDs）, polychlorinated dibenzofurans （PCDFs） and polycyclic aromatic hydrocarbons （PAHs） were studied. Coal and calcium oxide （CaO） were added during the sewage sludge combustion tests to optimize combustion conditions and control SO2 emission. The results indicated that the flue gases emitted during mono-combustion of sewage sludge were characterized by relatively high concentrations of SO2, NOx and organic pollutants, due to the high sulfur, nitrogen, and volatile matter content of sewage sludge. The total 16 USEPA priority PAHs and 2,3,7,8-substituted PCDD/Fs produced from sewage sludge combustion were found to be 106.14 μg/m^3 and 8955.93 pg/m^3 in the flue gas, respectively. In the case of cocombustion with coal （msludge/mcoal =1：1）, the 16 PAHs and 2,3,7,8-substituted PCDD/Fs concentrations were markedly lower than those found during mono-combustion of sewage sludge. During co-combustion, a suppressant effect of CaO on PCDD/Fs formation was observed.

关键词： co-combustion PCDD/Fs polycyclic aromatic hydrocarbons (PAHs) sewage sludge

Study of a Novel Rotary Cyclone Gas-Solid Separator

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Journal of thermal Science 2003年第3期12卷 275-278,282页

作者： Zhiguang Ling Xingyong DengResearch institute of energy and Environmental engineering, Shanghai University of engineering Science, 200336, Shanghai, china Research institute of energy and Environmental engineering Shanghai University of Engineering Science Shanghai China

Based on the analytical study of the characteristics of fine particle motion in swirling flow, a new design idea on flow organization and construction aimed at increasing the positive radial flow in the separation chamber of the rotary cyclone separator (PRV type) was proposed. Experimental verification including the test of variation of separation efficiency and pressure loss with the first and secondary flow ratio show that this new type separator has higher and more stable separation efficiency in broad flow ratio range while the pressure loss is far below the conventional rotary cyclone separator and even comparable with that of simple cyclone separator.

关键词： gas-solid separation rotary cyclone separator flows in cyclones

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烧蚀防热材料的显微结构研究

无机材料学报 2002年第6期17卷 1233-1238页

作者：江伟辉周健儿胡行方吴国庭景德镇陶瓷学院材料工程系景德镇333001 中国科学院上海硅酸盐研究所上海200050 北京空间飞行器总体设计部北京100086

研究了二种烧蚀防热材料的显微结构.研究表明:烧蚀材料1＃中的高硅氧玻璃纤维在模拟烧蚀后仍保持其纤维形态不变,并且大、中、小纤维以适当的配比结合,使得纤维堆积密度增大,从而能提高材料的机械强度;烧蚀材料2＃具有蜂窝夹心结构,在... 详细信息

研究了二种烧蚀防热材料的显微结构.研究表明:烧蚀材料1＃中的高硅氧玻璃纤维在模拟烧蚀后仍保持其纤维形态不变,并且大、中、小纤维以适当的配比结合,使得纤维堆积密度增大,从而能提高材料的机械强度;烧蚀材料2＃具有蜂窝夹心结构,在蜂窝中填充的低密度材料是由50～100μm的空心玻璃球所组成的,这赋予它密度低、隔热性能好的特点.

关键词：烧蚀防热烧蚀材料显微结构高硅氧玻璃纤维

Comparison study of trapped water in human erythrocytes by EPC and DSC method and its application

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Science china(Technological Sciences) 2004年第3期47卷 343-351页

作者： ZHAO Gang1, HE Liqun1, GUO Xiaojie2, LIU Zhong3, LUO Dawei1,3 & GAO Dayong1,3 1. Cryobiomedical engineering Research institute, department of thermal Science and energy engineering, University of Science and Technology of china, Hefei 230027, china 2. Red Cross Blood Center of Hefei, Hefei 230022, china 3. department of Mechanical engineering, University of Kentucky, Lexington, KY 40506-0108, USA Univ Sci & Technol china Cryobiomed Engn Res Inst Dept Thermal Sci & Energy Engn Hefei 230027 Peoples R China Red Cross Blood Ctr Hefei Hefei 230022 Peoples R China Univ Kentucky Dept Mech Engn Lexington KY 40506 USA

The novel differential scanning calorimetry method for determining trapped water volume of human red blood cell during freezing process has been reexamined. Results show that the final erythrocyte volume is 53% of its isotonic volume after freezing to -40℃. An electronic particle counter (MultisizerTM III, Beckman Coulter Inc., USA) was used to measure cell volume changes in response to hypertonic solution. Using this approach, when extracellular solution was 3186 mOsm, the equilibrium cell volume was found to be 57% of its isotonic value. Both results indicate that 34%—40% of intracellular water is trapped and cannot respond to osmotic difference between intra- and extracellular solution. These findings are consistent with the published data: at least 20%—32% of the isotonic cell water volume is retained within RBCs during freezing. Some applications of the values of trapped water are addressed.

关键词： differential scanning calorimeter/DSC, electronic particle counter/EPC, cell volumetric change, red blood cell/RBC/erythrocyte