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    30 March 2012, Volume 46 Issue 2 Previous Issue    Next Issue
    Numerical Simulation of Biomass Gasification Using Fluent
    ZHANG Peng-wei;XIAO Jun;SHEN Lai-hong
    2012, 46 (2):  1-6. 
    Abstract ( 988 )   PDF (2041KB) ( 1355 )   Save
    A model was developed to simulate the biomass-steam gasification process in a fluidized bed using Fluent. The effects of temperature on biomass gasification were studied. The results were presented as carbon conversion, gas component and gas yield. The simulated and experimental results were compared and showed good agreement. The simulated results show that the carbon conversion and gas yield increase with the rise of temperature. The height of bed has a great influence on CO and H2 yield. Under the simulation conditions, maximum H2 volume fraction is about 55 %. It indicates that the gasifying agent steam benefits H2 production for biomass gasification. The results also show that Fluent software is a useful tool for predicting the biomass gasification process.
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    Further Improvement of the Conductivity of Polypyrrole-coated Conductive Paper
    LEI Yu;QIAN Xue-ren;AN Xian-hui
    2012, 46 (2):  7-11. 
    Abstract ( 696 )   PDF (1753KB) ( 809 )   Save
    In this study, electrically conductive paper was prepared by in situ polymerization of pyrrole in pulp suspension to further understand the conductivity of polypyrrole-coated conductive paper. The iron(Ⅲ) sulfosalicylate complex genereated by adding 5-sulfosalicylic acid solution to ferric chloride solution was used as a mild oxidant to replace ferric chloride. The conductivity and environmental stability of the samples prepared with the mild oxidant were improved to a certain degree. It was found that 5-sulfosalicylic acid did not only complex with ferric ions, but also act as dopant. In fact, p-toluenesulfonic acid used as dopant seems to be unnecessary. SEM and EDX analysis results showed that there were significant differences in the image brightness and doping levels of the samples prepared by different oxidant and dopant. Using purchased iron(Ⅲ) p-toluenesulfonate as both oxidant and dopant could not obtain the polypyrrole-coated conductive paper with good conductivity and environmental stability perhaps due to the low oxidizing ability of this compound. In addition, the effect of water during pulp storage operation on the conductivity was investigated. The results showed that pulp storage operation had no obvious negative influence on the conductivity of polypyrrole-coated paper.
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    Preparation of Reference Materials of Hydrogenated Rosin for Gas Chromatography Analysis
    WANG Zhen-hong;YE Bo-hui;SHANG Shi-bin
    2012, 46 (2):  12-20. 
    Abstract ( 820 )   PDF (1097KB) ( 1088 )   Save
    Reference materials of hydrogenated rosin were prepared using commercial hydrogenated rosin. Qualitative and quantitative analysis of resin acid of hydrogenated Rosin was carried out by gas chromatography-mass spectrometry using DB-35 ms quartz capillary column. Homogeneity examination of the reference materials of resin acid components was applied by statistical analysis. The property and uncertainty value on the content (GC%) of four characteristic resin acids from reference materials was calculated for certification.
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    Optimization of Extraction Technology for Rubber Seed Oil by Orthogonal Design
    ZHENG Yun-wu;HUANG Yuan-bo;ZHENG Zhi-feng;JIANG Li
    2012, 46 (2):  21-24. 
    Abstract ( 725 )   PDF (823KB) ( 679 )   Save
    In order to study the process optimization for extraction of rubber seed oil, the solvent extraction method was used. The petroleum ether was used as extracting solvent. According to the single factor test the effects of liquid-solid ratio, extraction time, and extraction temperature on the extraction ratio of rubber seed oil were investigated through orthogonal design. The optimum extraction conditions were as follows: petroleum ether as extracting solvent, the sample particle 0.90 mm, rubber seed 20 g, liquid-solid ratio of 7:1 (mL:g), the extraction temperature 75 ℃, and the extraction time 8 h. Under the optimum condition, the extraction ratio of rubber seed oil was 35.17%.
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    Paclitaxel Distribution in Entire Plant of Taxus chinensis var. mairei by HPLC
    ZHANG Xiang-yu;DU Ya-tian
    2012, 46 (2):  25-29. 
    Abstract ( 637 )   PDF (1622KB) ( 796 )   Save
    Accumulation distribution of paclitaxel in entire plant of Taxus chinensis var. mairei was investigated. The content of paclitaxel in organs and tissues of T.chinensis var mairei that was wild or cultivatied about 20 years old was analyzed by HPLC. The results show that the paclitaxel in the plant is downward and has rhizosphere accumulation significantly. At the organ level, the contents of paclitaxel from branch leaves to fibrous root are 0.007 61 %-0.100 54 % (dry weight, wild) and 0.015 25 %-0.061 75 % (dry weight, cultivation) respectively. In the tissue level, the contents of paclitaxel in xylem tissue from morpholo-gical upper part to root are 0.010 95 %-0.044 76 % (dry weight, wild) and 0-0.017 58 % (dry weight, cultivation). The accumulation of paclitaxel in skin tissue increase from morphological upper part to lower part. The contents of paclitaxel in main branch bark are 0.013 32 % (dry weight, wild) and 0.006 77 % (dry weight, cultivation), and in root bark are 0.08633% (dry weight, wild) and 0.059 74 % (dry weight, cultivation) respectively. The output of paclitaxel in wild taxus chinensis is higher than that in cultured taxus chinensis. The distribution of paclitaxel was linear at its contents 21-105 mg/L (r2=0.999).The average recovery was 85.78%,and the RSD was 1.03%.
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    Research Advances on Analysis of Condensed Tannins from Plant Extracts
    ZHANG Liang-liang;WANG Yong-mei;XU Man;WU Dong-mei;CHEN Jia-hong
    2012, 46 (2):  30-38. 
    Abstract ( 561 )   PDF (1071KB) ( 921 )   Save
    In this review, we first focused on the complexity of the structures of condensed tannins. Then we paid more attention to the analytical methods which were used to evaluate tannins. The methods included protein precipitation, acid butanol assay, vanillin assay, Prussian blue assay, Folin-Ciocalteu assay and chromatographic analysis.
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    Research Progress on Biomass Gasification and Catalytic Reforming of Biomass Tar
    WANG Duo;LIU Yun-quan
    2012, 46 (2):  39-47. 
    Abstract ( 758 )   PDF (1082KB) ( 1492 )   Save
    In this paper, biomass gasification technologies and related subjects are reviewed. The optimization design of the gasifier which is different from the traditional gasifier structure and the effect of catalysts on tar reforming and syngas quality are discussed. Finally, the direction for further research and development is pointed out, such as the simulation of biomass gasification reactors, the mechanism of catalytic reaction and its dynamics model establishment.
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    Review on the Influence of Biodiesel on Diesel Engine Emission NOX
    ZHANG Yong-hui;MIN Yong-jun;HUA Liang
    2012, 46 (2):  48-52. 
    Abstract ( 687 )   PDF (833KB) ( 970 )   Save
    Biodiesel is one of the best alternative fuels. Research status of emission NOX of diesel engine with biological diesel from four aspects was summarized in the paper. The reason of NOX emissions increase were discussed, and the measures of reducing NOX emission were analyzed from two aspects, i.e., the improvement of biodiesel and diesel engine. Further research direction was pointed out.
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