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Table of Content
25 September 2003, Volume 54 Issue 9
    综述与专论

    RECENT PROGRESS IN CONVERSION OF METHANE UNDER LOW TEMPERATURE PLASMA CATALYSIS

    WANG Dawang;MA Tengcai;CUI Jinhua
    2003, 54(9):  1193-1200. 
    Abstract ( 703 )   PDF (393KB) ( 488 )  
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    Current research status on methane conversion under low temperature plasma is reviewed. Both advances and prospects of techniques, reactors and reaction mechanisms of methane conversion under low temperature plasma are described.
    GAS-LIQUID HEAT EXCHANGE ON ADSORPTION REFRIGERATION SYSTEM
    WANG Wen, QU Tianfei, DENG Yalin, LI Zhonghua, WANG Ruzhu
    2003, 54(9):  1201-1204. 
    Abstract ( 493 )   PDF (166KB) ( 190 )  
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    Suction line heat exchanger is used for inner heat recovery with which heat is exchanged between condensed refrigerant liquid and evaporated refrigerant gas. In a general refrigeration system,inner heat recovery is helpful to increase cooling output, but it may lower the performance of vapor compressing refrigeration system sometimes also. In adsorption refrigeration cycle, inner heat recovery is beneficial to improve the cycle performance in terms of quantitative thermodynamic analysis. Although inner heat recovery decreases the cooling effect to adsorbent from evaporated gas,this does not offset the tendency of increasing cooling output. Some experimental data also verify that the precooler recovers some heat from the evaporated gas and help the evaporator to provide much more cooling capacity. Therefore, in adsorption refrigeration system, the precooler for inner heat recovery is an effective element to improve its performance,especially in the situation that condensing temperature is far higher than evaporating temperature.
    HEAT TRANSFER ENHANCEMENT CHARACTERISTICS OF NON-DECAYING SWIRL FLOW DUE TO SPIRAL FIN
    GAO Xiang, LUO Zhongyang, ZHOU Jinsong, NI Mingjiang, CEN Kefa
    2003, 54(9):  1205-1208. 
    Abstract ( 545 )   PDF (167KB) ( 261 )  
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    The heat transfer enhancement and flow resistance characteristics of non-decaying swirl flow formed by a spiral fin tube is investigated experimentally in this paper. The effects of non-decaying swirl flow, decaying swirl flow and non-swirl flow on heat transfer and resistance characteristics are also compared and analyzed. The experimental results indicate that heat transfer coefficient of non-decaying swirl flow increases by 60%~80% compared with non-swirl flow and by 49% compared with decaying swirl flow, but the pressure drop of non-decaying swirl flow is obviously higher than that of decaying swirl flow and non-swirl flow. The analysis results show that the comprehensive thermal property of non-decaying swirl flow is better than that of decaying swirl flow at a low Re, when Re is larger than a critical value (Re=1.8×104 in this experiment) the decaying swirl flow is better.
    COMPRESSIBLE GAS FLOW IN POROUS MEDIA/FLUID COUPLED AREAS
    ZHANG Xiwen, LI Heng, YAO Zhaohui
    2003, 54(9):  1209-1214. 
    Abstract ( 524 )   PDF (229KB) ( 610 )  
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    Numerical simulation and theoretical investigation of fluid flow and heat transfer in porous media/fluid coupled areas have been widely studied in recent years. Few researches are focused on compressible gas flow in porous media/fluid coupled areas.The unified governing equations for the fluid and porous media are used to describe the compressible flow in porous media/fluid coupled areas. A method to decide the source terms for flow in porous media is also presented. As an example, a detailed numerical simulation of compressible gas flow in a straight round pipe with porous media/fluid coupled areas and backward-facing and forward-facing steps are carried out and the computational results coincide with the experimental data.
    FLOW EVAPORATION HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL MICRO-FIN TUBES
    WU Xiaomin, WANG Xiaoliang, WANG Weicheng
    2003, 54(9):  1215-1219. 
    Abstract ( 482 )   PDF (215KB) ( 201 )  
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    To investigate the effects of micro-fin geometry and operating conditions on flow evaporation performance of micro-fin tubes, tests were conducted on four micro-fin tubes having different micro-fin geometries and one smooth tube having 9.52mm outside diameter (OD). Two of the micro-fin tubes had 9.52mm OD and the remaining two had 7.0mm OD.The refrigerant used was R22. The experiments were carried out for 90—400kg•m-2•s-1 refrigerant mass fluxes at 7℃ evaporation temperature, 15%—20% inlet vapor quality, 5—6℃ outlet superheat degrees. The variations of evaporation performance of micro-fin tubes with refrigerant mass flux were obtained. The effects of micro-fin geometry and tube diameter on performance were discussed. The two 9.52mm OD micro-fin tubes yielded 130% and 180% greater heat transfer coefficients than the smooth tube, while the inside surface areas of the two micro-fin tubes were only 40% and 70% greater than that of the smooth tube.
    ELECTRIC FIELD ENHANCEMENT OF ETHYL ACETATE CONVECTION AND POOL BOILING HEAT TRANSFER
    WANG Fagang, LI Ruiyang, YU Hongling, LIU Yongqi, LIU Yuying, LIN Zonghu
    2003, 54(9):  1220-1223. 
    Abstract ( 641 )   PDF (168KB) ( 267 )  
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    The electric field enhancement of natural convection and pool boiling heat transfer of ethyl acetate on plate surface was investigated. The comparison and analysis for the experimental results were performed. The experimental data indicated that electric field has a strong enhancement effect for natural convection and pool boiling heat transfer of ethyl acetate. The enhancement effect of electric field for ethyl acetate natural convection heat transfer is larger than the effect for pool boiling heat transfer. At the same voltage, the enhancement factor,f,decreases gradually with further increasing heat fluxes. When the heat flux is larger than 4kW•m-2, the variations in enhancement effect of electric field for natural convection heat transfer are much less with further increasing of heat flux.At the same heat flux, the enhancement factor increases gradually with increasing voltage of the applied electric field. Since ethyl acetate is a strong polar organic dielectric, it has intense response to the electric field applied. In the experimental condition, the enhancement factor of electric field for natural convection heat transfer reaches 6—7. For pool boiling heat transfer, the enhancement factor reaches 4—5.
    ANALYSIS OF PARTICLES MOTION AND CONVECTION HEAT TRANSFER IN CIRCULATING FLUIDIZED BED
    LV Junfu, TIAN Yong, PENG Xiaofeng, YUE Gu
    2003, 54(9):  1224-1229. 
    Abstract ( 509 )   PDF (254KB) ( 476 )  
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    The forces affecting the motion of particle clusters near the wall of a Circulating Fluidized Bed (CFB) were analyzed to determine the contact time of particle clusters and to develop a theoretical model for the particle-gas convection heat transfer coefficient. The results compare well to prior experimental data,suggesting that this theory accurately reflects the convection heat transfer in a CFB.
    DENSE TWO-PHASE TURBULENT FLOW OF POWER LAW FLUID WITH PARTICLES IN PIPE
    ZENG Zhuoxiong, KANG Liqiang, JIANG Peizheng, DAI Hongxing, LIU Zilei
    2003, 54(9):  1230-1234. 
    Abstract ( 655 )   PDF (183KB) ( 343 )  
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    The characteristics of power law fluid governing equation was elaborated and the effect of viscosity and flow exponent on two-phase flow was studied. With increasing flow exponent, the velocity of power law fluid near the pipe center decreased, and the velocity of particle near the pipe center increased but decreased near the pipe wall. With increasing viscosity, the velocities of power law fluid and particle showed the same trend. It was found be compared the two-phase flow of power law fluid-solid with that of liquid-solid that the fluid velocity of power law fluid-solid was bigger than that of liquid-solid and the particle velocity distribution of power law fluid-solid was flatter than that of liquid-solid.
    催化、动力学与反应器
    OPERABILITY OF REVERSE FLOW REACTOR FOR CATALYTIC COMBUSTION OF CONTAMINANTS
    NIU Xuekun;CHEN Biaohua;LI Chengyue;ZHOU Jiyi
    2003, 54(9):  1235-1239. 
    Abstract ( 571 )   PDF (219KB) ( 227 )  
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    In a pilot scale reverse flow reactor with a liter of catalyst, catalytic combustion of typical industrial waste gas contaminated with volatile aromatic compounds (VOC) was systematically investigated, and the “temperature run-away”in the case of too high feed concentration and the “extinction of reactor” in the case of low feed concentration were observed. More attention was paid to determining the range of feed concentration in which through adjusting operation parameters,such as the periodic time,the reactor could achieve a high conversion of VOCs and meanwhile maintain a stable ignited state,i.e neither “temperature run-away” nor “extinction”.
    ACTIVITY AND STABILITY OF RuO2/γ-Al2O3 CATALYST IN WET AIR OXIDATION
    YANG Shaoxia, FENG Yujie, CAI Weimin, WAN Jiafeng
    2003, 54(9):  1240-1245. 
    Abstract ( 774 )   PDF (276KB) ( 509 )  
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    A kind of CWAO catalyst, RuO2/γ-Al2O3, was prepared by dipping Al2O3 into aqueous solution composed of RuCl3. Taking phenol as organic substrate,the influences of the initial pH of the feed solution and degradation temperatures on the stability and the activity of RuO2/γ-Al2O3 catalyst were investigated. Results showed that leaching of Ru and Al existed in the process of CWAO of phenol and the amount of leached Ru and Al increased with decreasing initial pH of the feed solution, but phenol removal was higher in the acidic feed solution than that in the alkaline feed solution. The amount of leached Ru and Al decreased and phenol removal was higher with increasing degradation temperature. The influences of Ce and Zr added to RuO2/γ-Al2O3 catalyst on the stability and the activity of the catalyst were also studied. The result showed that doping of Ce and Zr into RuO2/γ-Al2O3 catalyst can promote the stability and activity of the catalyst prepared.
    过程系统工程
    ADVANCEMENT OF SIMULATION AND OPTIMIZATION FOR THERMALLY COUPLED DISTILLATION USING NEURAL NETWORK AND GENETIC ALGORITHM
    WANG Yanmin;YAO Pingjing
    2003, 54(9):  1246-1250. 
    Abstract ( 583 )   PDF (211KB) ( 527 )  
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    Thermally Coupled Distillation Columns are more efficient than conventional sequences. Because of the difficulties of proper design, their applications are restricted. In this paper, a new approach using genetic algorithm and artificial neural network for the optimization of thermally coupled distillation is presented. Mathematical model constructed with artificial neural network based on the simulation results with ASPEN PLUS. The Comparison of ANN prediction results and ASPEN PLUS simulation results shows that the model can simulate thermally coupled distillation rightly. Modified genetic algorithm is used to optimize the artificial neural network model. With the proposed model and optimization algorithm, the decision variables and the target value can be solved automatically and quickly. The convergence curve proves the efficiency of the genetic algorithm. A practical example is used to demonstrate the algorithm.
    A NEW CONTINUOUS-TIME MILP MODEL FOR SCHEDULING OF MULTI-PRODUCT BATCH PLANTS
    WU Jianyu, HE Xiaorong, CHEN Bingzhen, QIU Tong
    2003, 54(9):  1251-1256. 
    Abstract ( 692 )   PDF (240KB) ( 305 )  
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    Batch processes are widely used in producing many high-value chemical products for its good flexibility. However, the production and costeffectiveness of batch plants mostly depend on short-term scheduling. The construction of traditional models for batch scheduling relies on the definition of time slots or time events, which lead to the result that many binary variables are involved in the models and it takes much time to solve the problems with the branch and bound method.A new kind of model for scheduling of multi-product batch plants is presented. The new model uses a continuous-time domain representation that does not rely on the definition of time slots or time events. The symmetrical and complemental feature of binary variables is also considered to simplify the model. As a result, the number of binary variables of the new model is successfully reduced to no more than half of the traditional ones. A medium-scale example is presented to prove that the new model quickly solve and reach the global optimal result. Comparisons with traditional model are also provided with large-scale problems. Moreover, the principle of the new model can be not only used in the multi-product problem,but also easily applied in other aspects such as multi-purpose batch scheduling and so on.
    EFFICIENT SEPARATION AND PURIFICATION OF BOVINE HEMOGLOBIN USING EXPANDED BED ADSORPTION
    LU Xiuling, ZHAO Dongxu, JIN Yetao, SU Zhiguo
    2003, 54(9):  1257-1263. 
    Abstract ( 760 )   PDF (321KB) ( 631 )  
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    Direct separation and purification of hemoglobin from fresh bovine hemolysate were studied with expanded bed adsorption. Ionic strength, pH and temperature had great influence on the formation of methemoglobin in the process. The purity and recovery of the product were also influenced by these factors. The conditions for adsorption and elution were optimized. The best performance was obtained by using 10mmol•L-1 phosphate buffer solution, pH6.6. Eluting at pH 7.2 was carried out at low ionic strength and the final recovery of hemoglobin was more than 80%. A low temperature of 4℃ in the process was necessary for prevention of methemoglobin formation. Under optimized conditions, natural bovine hemoglobin of electrophoretical purity could be obtained by only one step of operation, and the dynamic adsorption capacity was between 70—75mg•ml-1. HPLC result suggested that the purity of the product was about 99%.Methemoglobin was kept as low as 5.4%. Compared with the traditional process of membrane filtration followed by chromatography, the expanded bed adsorption has the advantages of short processing time, high recovery, and high product activity. The method was simple, efficient and potential scale-up to commercial production.
    KINETICS OF GAS-LIQUID REACTION OF NO WITH Co(NH3)2+6
    LONG Xiangli, XIAO Wende, YUAN Weikang
    2003, 54(9):  1264-1268. 
    Abstract ( 683 )   PDF (192KB) ( 218 )  
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    Oxidation and absorption of nitric oxide can be achieved by using cobalt(Ⅱ) in aqueous ammonia solution. Nitric oxide is oxidized to soluble nitric dioxide in liquid phase. The Co(NH3)2+6 produced by cobalt(Ⅱ) ions complexing with ammonia acts as the catalyst. The oxidant is the oxygen in flue gas. Oxidation and absorption of nitric oxide proceed simultaneously. A stirred vessel with a plane gas-liquid interface was used to measure the chemical absorption rates of nitric oxide into Co(NH3)2+6 solutions. The reaction of NO with Co(NH3)2+6 can be considered as instantaneous. The gas-liquid reaction becomes gas film controlling as Co(NH3)2+6 concentration exceeds 20mmol•L-1. Oxygen in the gas phase is favorable to the absorption of nitric oxide, but the effect is less significant at oxygen concentration above 5.2%. The NO absorption rate decreases with increasing temperature. The kinetic equation of NO absorption into Co(NH3)2+6 solutions in the presence of oxygen is presented.
    DEGRADATION OF 4-CHLOROPHENOL IN AQUEOUS SOLUTION WITH PULSED HIGH-VOLTAGE DISCHARGE PLASMA
    CHEN Yinsheng, ZHANG Xinsheng, DAI Yingchun, YUAN Weikang
    2003, 54(9):  1269-1273. 
    Abstract ( 452 )   PDF (211KB) ( 226 )  
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    The effects of some factors on degradation of 4-chlorophenol in waste water with pulsed high-voltage discharge plasma were studied. Furthermore,the kinetics of degradation of 4-chlorophenol was also studied. The degradation efficiency of 4-chlorophenol could be raised considerably by increasing peak voltage, bubbling rate of gas and by decreasing electric conductivity of waste water. The presence of alcohol would decrease the degradation efficiency of 4-chlorophenol. The degradation of 4-chlorophenol in waste water with pulsed high-voltage plasma was a first-order reaction. The correlation between degradation rate constant k and reaction temperature T could be expressed by Arrhenius equation. At initial pH 7.0, electric conductivity of waste water 80μS•cm-1,peak voltage 30kV,discharge frequency 60Hz,the diameter of discharge electrode 0.6mm,and discharge distance were 3.0cm, A was 1.365×10-2min-1 and experimental activation energy Ea was 5.129kJ•mol-1. The degradation rate constant k could also be expressed.
    能源和环境工程
    SIMPLIFIED SOLOMON PYROLYSIS MODEL AND SIMULATION OF NO FORMATION IN SWIRLING COAL COMBUSTION

    ZHANG Yu;ZHOU Lixing;ZHANG Jian

    2003, 54(9):  1274-1278. 
    Abstract ( 549 )   PDF (194KB) ( 276 )  
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    A simplified Solomon pyrolysis model for simulating HCN release in NO formation during coal combustion is proposed. A full two-fluid model together with the k-ε-kp two-phase turbulence model, the EBU-Arrhenius combustion model, the six-flux radiation model, and two different HCN release models are used to simulate gas-particle flows, coal combustion, HCN release and NO formation in a swirl burner. Comparison of predictions with experimental results taken from references indicates that the HCN release model based on the simplified Solomon pyrolysis model is better than the original HCN release model based on the two-equation pyrolysis model.
    REMOVAL OF DODECANETHIOL IN SIMULATED PETROLEUM PRODUCT BY RADIATION OF GAMMA RAYS
    TIAN Yangjie, YAN Naiqiang, LI Daotang, YAO Side, WANG Wenfeng
    2003, 54(9):  1279-1283. 
    Abstract ( 552 )   PDF (209KB) ( 220 )  
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    A novel desulfurization method for petroleum products by gamma rays radiation is put forward and investigated in this paper. The n-dodecanethiol (DCT) dissolved in n-dodecane was used as the simulated petroleum product. The results showed that the degradation efficiency of DCT was proportional to the radiation dose of gamma rays, and a lower dose rate seemed to correspond to higher degradation efficiency at the same dose. Degradation occurred under both circumstances with and without oxygen, while the demanded dose for the degradation efficiency of 90% was 250kGy and 700kGy, which implied that the degradation process was improved greatly by oxygen. Part of the end product of DCT degradation was sulphate with oxygen, and hydrogen sulfide was detected under the condition without oxygen.
    THEORY AND METHOD OF APPLICATION-ORIENTED CERAMIC MEMBRANES DESIGN (Ⅰ) SIMULATION OF RELATION BETWEEN MEMBRANE PERMEABILITY AND MICRO-STRUCTURE
    XU Nanping, LI Weixing, ZHAO Yijiang, XING Weihong, SHI Jun (Jiun Shyr)
    2003, 54(9):  1284-1289. 
    Abstract ( 724 )   PDF (253KB) ( 346 )  
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    A research framework of application-oriented ceramic membrane design was proposed. The effects of membrane pore size distribution and particle size distribution of suspension on filtration were analyzed. In this work a blocking factor(k) was given to describe membrane fouling and a new crossflow microfiltration model of particle suspensions was built. This model discovers the correlation between membrane permeability and microscopic material structure, by which the variation of permeate flux with filtration time would be obtained and the influences of membrane structure parameters on permeate flux could be predicted.The model calculation showed good agreement with the experimental results.
    THEORY AND METHOD OF APPLICATION-ORIENTED CERAMIC MEMBRANES DESIGN (Ⅱ) PREDICTION OF EFFECTS OF MEMBRANE STRUCTURE PARAMETERS ON MICROFILTRATION OF PARTICLE SUSPENSION
    LI Weixing, ZHAO Yijiang, LIU Fei, XING Weihong, XU Nanping, SHI Jun (Jiun Shyr)
    2003, 54(9):  1290-1294. 
    Abstract ( 679 )   PDF (187KB) ( 310 )  
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    Based on the established model of microfiltration for separating particle suspensions, which described the relation between membrane structure parameters and its permeability, the influences of membrane structure parameters such as pore size, thickness and porosity on its performance were theoretically predicted and discussed under the ideal conditions that membrane pore size and particle size distribution are normal. The simulated results showed that there was an optimum pore size in the filtration of suspensions which maximized permeate flux, and the optimum pore size was influenced by the size and size distribution of the particulates.
    THEORY AND METHOD OF APPLICATION-ORIENTED CERAMIC MEMBRANES DESIGN (Ⅲ) OPTIMIZATION AND PREPARATION OF CERAMIC MEMBRANE FOR FILTRATION OF TITANIA SUSPENSION
    ZHAO Yijiang, LI Weixing, ZHANG Wei, XING Weihong, XU Nanping, SHI Jun (Jiun Shyr)
    2003, 54(9):  1295-1299. 
    Abstract ( 732 )   PDF (209KB) ( 385 )  
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    On the basis of the developed microfiltration model, membrane pore size was optimized to filter the particle suspensions of titanium pigment. The optimized Al2O3 ceramic membrane was prepared by state particle sintering method and characterized by SEM and the gas bubble pressure method. The prepared membrane was superior to commercial membranes and the model calculation showed good agreement with the experimental results. The method of application-oriented ceramic membranes design was basically completed.
    FINITE ELEMENT SIMULATION OF HOT VULCANIZATION PROCESS OF MOLDABLE SILICONE RUBBER MATERIAL
    JIA Yuxi, SUN Sheng, LIU Lili, ZHAO Guoqun
    2003, 54(9):  1300-1304. 
    Abstract ( 607 )   PDF (211KB) ( 666 )  
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    The kinetic model of vulcanization of liquid silicone rubber was established by experiment, and the conversion rate of the reactants was calculated. The fundamental control equation for calculating the temperature field accompanied by reaction heat was derived, and two types of thermal boundary conditions were analyzed. The implementation procedures of the numerical simulation were described in detail. The simulation software of hot vulcanization process of moldable silicone rubber was designed. Finally, the rationality of the simulation theory and algorithm was verified by one typical engineering example and its hardness test as well as its engineering application.
    多相流
    MICRO FLOW BEHAVIOR OF PARTICLES IN DILUTE PHASE OF RISER

    LIU Hui’e;WEI Fei ;JIN Yong

    2003, 54(9):  1305-1309. 
    Abstract ( 643 )   PDF (211KB) ( 182 )  
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    It has been acknowledged that a dilute-phase/dense-cluster two-phase micro flow structure exists in the riser. The particle velocity signals from Laser Doppler Velocimeter are analyzed and the velocity and turbulent velocity of particles in the dilute phase are obtained. The radial velocity distribution of particles in the dilute phase is similar to a parabola. A correlation, similar to the 1/n power law of gas velocity in turbulent state, is given to describe the velocity distribution quantitatively. The cross-sectional average velocity of particles in the dilute phase is nearly equal to the superficial gas velocity, which indicates that the particles in the dilute phase exist in individual particle state. A maximum value exists at the radial position r/R=0.5—0.8 for the turbulent velocity of particles in the dilute phase. This radial position may correspond to the boundary between the dilute phase controlled region and the dense cluster controlled region.
    RISING BUBBLE DISTRIBUTION IN STAGNANT LIQUID
    SUN Qi;ZHAO Hua;YANG Ruichang
    2003, 54(9):  1310-1314. 
    Abstract ( 515 )   PDF (218KB) ( 252 )  
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    It is significant for the development of multidimensional two-phase models to study the measurement technology and distribution characteristics of local parameters in two-phase flow. The radial distribution of a rising bubble in stagnant liquid is investigated through the radial measurement in a vertical tube using the dual-sensor optical probe. The analyses of probe signals show that optical probe is very sensitive to the bubble signals and satisfactory measurement results can be obtained. Besides, the effect of the up-stream sensor on the down-stream one is studied in this paper.
    催化、动力学与反应器
    PREPARATION OF PHOTO-CATALYTIC TiO2 BY SUPERCRITICAL ETHANOL (Ⅰ) SYNTHESIS AND PHOTOCATALYSIS
    HUANG Biao
    2003, 54(9):  1315-1318. 
    Abstract ( 523 )   PDF (170KB) ( 200 )  
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    Photo-catalytic TiO2 was prepared from tetraisopropyl titanate (TPT) in supercritical ethanol. It was found that TPT in supercritical ethanol could be effectively converted into the anatase-form of TiO2 crystallites. The anatase-form of TiO2 as a photo-catalyst was evaluated for its adsorptivity and subsequent photo-catalytic activities on formaldehyde, one of the harmful air pollutants in the environment. As a result, the supercritically treated TiO2 had a high decomposing ability. Under the same condition, the experiment was repeated for 5 times,and photocatalysis of the samples did not decrease. This indicated that the supercritical treatment was effective to prepare photo-catalytic TiO2, which was feature by stability, longevity and high photo-catalytic decomposition of formaldehyde for environmental cleaning. Meanwhile, unlike conventional chemical reaction, which is complex and time-consuming, supercritical treatment is easy to operate, saving both time and labor.
    过程系统工程
    HEAT TRANSFER PERFORMANCE MODEL OF PULSATING HEAT PIPE BASED ON NEURAL NETWORK

    CUI Xiaoyu;WENG Jianhua;M.GROLL

    2003, 54(9):  1319-1322. 
    Abstract ( 662 )   PDF (174KB) ( 331 )  
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    This paper presents artificial neural network (ANN) modeling of heat transfer performance for a pulsating heat pipe (PHP). The investigated PHP is a vertical closed loop copper/ethanol PHP. Fully connected multi-layer feed forward network is adopted and back propagation momentum algorithm, sigmoid node function are used. In the network, two input nodes correspond to heat load and fill rate and the output is a single node for thermal resistance. The matching of the ANN test output data and the experimental data is satisfying. It can be inferred that the ANN model can be applied to accurately model PHP performance.
    表面与界面工程
    CORROSION INHIBITION AND SYNERGISTIC EFFECT OFGREEN SCALE INHIBITOR POLYEPOXYSUCCINIC ACID
    XIONG Rongchun;ZHOU Qing;WEI Gang
    2003, 54(9):  1323-1325. 
    Abstract ( 879 )   PDF (139KB) ( 647 )  
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    The corrosion inhibition of a kind of green scale inhibitor, polyepoxysuccinic acid (PESA) was studied based on dynamic experiments. In addition, the synergistic effect among PESA, Zn2+ and sodium gluconate was also investigated. According to the experimental data, when only PESA is used, it had fairly good effect on steel. The synergy between PESA and Zn2+ or sodium gluconate was poor. However, the synergistic effect of PESA, Zn2+ and sodium gluconate is very good. Further experiments show that the corrosion inhibition of PESA is mainly affected by oxygen atom inserted.
    APPLICATION OF SVD AND CHI-SQUARE FOR MONITORING AND CONTROLLING BIOCHEMICAL PROCESS
    LI Yanke, ZHANG Shufen, YANG Jinzong
    2003, 54(9):  1326-1329. 
    Abstract ( 617 )   PDF (150KB) ( 197 )  
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    In this paper Singular Decompositon Value (SVD) formula and modified Chi-square solution are provided, and the modified Chi-square is combined with FT-IR instrument to control biochemical reaction process. Using the modified Chi-square technique, the unknown concentration of reactants and products in test samples withdrawn from the process is determined. The technique avoids the need for the spectral data to conform to Beer’s Law and the best spectral range is determined automatically.
    能源和环境工程
    EXPERIMENTAL STUDY ON ELECTRIC REGENERATION OF ION EXCHANGE RESIN
    ZHAO Ying;YIN Lianqing;LU Guangjie;YANG Chao
    2003, 54(9):  1330-1333. 
    Abstract ( 659 )   PDF (173KB) ( 486 )  
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    A new method of regenerating ion exchange resin was brought forward aiming at the improving of regeneration techniques used at present. Experimental study was made by adopting a single stage of three compartments regeneration device. Under the experimental conditions, electric regeneration of ion exchange resin in the packed electrodialysis bed was not effective. The most suitable way is to make acid and base from water electrodialysis with bipolar membrane electrodialysis.
    材料科学与工程
    EFFECTS OF PROCESSING PARAMETERS AND DIE DESIGN PARAMETERS ON FIBER DIAMETER IN MELT BLOWING PROCESS
    CHEN Ting;HUANG Xiubao
    2003, 54(9):  1334-1337. 
    Abstract ( 538 )   PDF (159KB) ( 396 )  
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    The air drawing model of polymer in melt blowing process is established by considering the effects of the variation of density and specific heat capacity at constant pressure of polymer melt with polymer temperature. The model is solved by introducing the numerical computation results of air jet flow field of the dual slot die, and model predictions of fiber diameter show good agreement with the experimental data. The effects of the processing parameters and die design parameters on fiber diameter are studied. It is found that lower polymer flow rate, higher initial polymer temperature, higher initial air velocity, smaller angle between the slot and the die axis, smaller width of the die head and larger width of the slot can all yield finer fibers.
    催化、动力学与反应器

    PREPARATION OF 4,4′-DIAMINOSTILBENE-2,2′-DISULFONIC ACID BY CATALYTIC HYDROGENATION

    ZHAO Xiaobo;CHEN Hongbo;ZHANG Shufen
    2003, 54(9):  1338-1339. 
    Abstract ( 490 )   PDF (92KB) ( 205 )  
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    生物化学工程、制药、食品和天然产物加工

    A NOVEL APPROACH FOR SIMULTANEOUSREDUCTION OF FeⅡ(EDTA)NO AND FeⅢ(EDTA) USING MICROORGANISMS

    LI Wei;SHI Yao;JING Guohua;MA Biyao

    2003, 54(9):  1340-1342. 
    Abstract ( 486 )   PDF (151KB) ( 357 )  
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    FRACTIONATING PHARMACEUTICAL MATERIAL BY SHORT PATH DISTILLATION

    XU Songlin;WANG Junwu;XU Shimin
    2003, 54(9):  1343-1344. 
    Abstract ( 524 )   PDF (82KB) ( 204 )  
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    能源和环境工程

    TRAPPING HO2 FREE RADICAL IN SONICATED WATER

    LIU Yan;WANG Jun
    2003, 54(9):  1345-1346. 
    Abstract ( 600 )   PDF (81KB) ( 242 )  
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