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Multiple linear equation of pore structure and coal–oxygen diffusion on low temperature oxidation process of lignite

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Chinese Journal of Chemical Engineering 2016年第6期24卷 818-823页

作者： xianliang meng Mingqiang Gao Ruizhi Chu Guoguang Wu Qiang Fang School of Chemical Engineering and Technology China University of Mining & Technology Key Laboratory of Gas and Fire Control for Coal Mines China University of Mining & Technology

This work aimed at studying the feasibility of calculating the coal-oxygen diffusion properties during the low temperature oxidation process of lignite so as to predict its spontaneous combustion process. Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the ffactal dimension of gas diffusion in the pore ways was calculated under different temperature. Considering pore size distribution, connectivity distribution and Fick diffusion mechanisms, the relationship between the gas diffusivity change with pore area ffactal dimension and porosity was investigated, and multiple linear equation of the coal- oxygen diffusion coefficients and pore parameters was obtained. Comparison between the experimental data and model prediction verifies the validiW of the model. The research provides a theoretical basis for the prediction model of coal-oxygen diffusion law.

关键词： Coal spontaneous combustionOxidationPore structureDiffusion

Catalytic kinetics of dimethyl ether one-step synthesis over CeO_2–CaO–Pd/HZSM-5 catalyst in sulfur-containing syngas process

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Chinese Journal of Chemical Engineering 2016年第12期24卷 1735-1741页

作者： Ruizhi Chu Wenxin Hou xianliang meng Tingting Xu Zhenyong Miao Guoguang Wu Lei Bai School of Chemical Engineering and Technology China University of Mining & Technology Xuzhou 221116 China High-Tech Research Institute of China University of Mining and Technology Lianyungang 222000 China Department of Chemical and Biomedical Engineering West Virginia University Morgantown 26506 USA

CeO_2–CaO–Pd/HZSM-5 catalyst was prepared for the dimethyl ether(DME) one-step synthesis in a continuous fixed-bed micro-reactor from the sulfur-containing syngas. The catalytic stability over hybrid catalyst of CeO_2–CaO–Pd/HZSM-5 was investigated to ensure that the kinetics experimental results were not significantly influenced by induction period and catalytic deactivation. A large number of kinetic data points(40 sets) were obtained over a range of temperature(240–300 °C), pressure(3–4 MPa), gas hourly space velocity(GHSV)(2000–3000 L·kg^(-1)·h^(-1)) and H_2/CO mole ratio(2–3). Kinetic model for the methanol synthesis reaction and the dehydration of methanol were obtained separately according to reaction mechanism and Langmuir–Hinshelwood mechanism. Regression parameters were investigated by the method combining the simplex method and Runge–Kutta method. The model calculations were in appropriate accordance with the experimental data.

关键词： CeO_2–CaO –Pd/HZSM-5 catalyst DME One-step synthesis Catalytic kinetics Sulfur-containing syngas

Investigation into co-pyrolysis characteristics of oil shale and coal

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International Journal of Mining Science and Technology 2012年第2期22卷 245-249页

作者： Miao Zhenyong Wu Guoguang Li Ping meng xianliang Zheng Zhilei School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China Key Laboratory of Coal Processing and Efficient Utilization Ministry of EducationXuzhou 221116China Jiangsu CUMT Dazheng Surface Engineering Technology Co.Ltd. Xuzhou 221116China

Samples of five types of coal and oil shale from the Daqing region have been subjected to co-pyrolysis in different blending ratios with thermo-gravimetry （TG）, given a heating rate of 30 ℃/min to a final tem- perature of 900 ℃. Investigations on pyrolysis of mixing coal and oil shale in different proportions were carried out, indicating that the main scope of weight loss corresponding to hydrocarbon oil and gas release was between 350 and 550 ℃. At higher temperatures, significant weight loss was attributed to coke decomposition. Characteristic pyrolysis parameters of blends from oil shale and the high ranked XZ coal varied with the blending ratio, but oil shale dominated the process. At the same blending propor- tions, highly volatile medium and low ranked coal of low moisture and ash content reacted well during pyrolysis and could easily create synergies with oil shale. Medium and high ranked coal with high mois- ture content played a negative role in co-pyrolysis.

关键词： Oil shaleCo-pyrolysisBlending coal samplesBlending ratio

Characteristics of coal sludge slurry prepared by a wet-grinding process

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International Journal of Mining Science and Technology 2016年第5期26卷 947-953页

作者： Ma Shaolian Wu Guoguang meng xianliang Zhou Rui Chu Ruizhi Miao Zhenyong Qi Yueming School of Chemical Engineering and Technology China University of Mining ＆ Technology Xuzhou 221116 China Ministry of Education＇s Key Lab of Coal Processing and High Efficient Clean Utilization Xuzhou 221116 China Advanced Analysis and Computation Center China University of Mining ＆ Technology Xuzhou 221116 China School of Resources and Ceosciences China University of Mining ＆ Technology Xuzhou 221116 China

Coal sludge slurry(CSS) is an alternative fuel and a potential competitive method for sludge *** on the researches of coal water slurry, we studied CSSs by using a wet-grinding process with different types of regional municipal sludge(sludge) in an orthogonal experiment. The sludge type,sludge mixing proportion, dosage of dispersant, and grinding time were tested in this study. The results show that water content and its occurrence characteristics in the sludge have primary hindering influences on slurry ability. The range of fixed-viscosity concentrations with raw wet sludge is from 50.78%to 44.40%(by weight), while the range is from 53.35% to 51.51%(by weight) with dry sludge. All of the CSSs exhibit shear-thinning behaviors with different variation trends, especially the CSSs with more than 15%(by weight) raw wet sludge in it. Adding the same proportion of raw wet sludge increases the thixotropic properties of CSSs and the highest area of thixotropy loop is 3065 Pa/s, while the highest value of dry sludge is 1798 Pa/s. Hydrophilic group plays an important role in adsorbing water and building three-dimension networks with other particles, which is the main reason for CSS ***, the mechanism can be used to find the way for making high quality CSS.

关键词： Coal sludge slurry Municipal sludge Wet-grinding process Fixed-viscosity concentration Hydrophilic groups

Enhancement of catalytic and anti-carbon deposition performance of SAPO-34/ZSM-5/quartz films in MTA reaction by Si/Al ratio regulation

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Chinese Journal of Chemical Engineering 2023年第4期56卷 314-324页

作者： Jiaxin Wu Chenxiao Wang xianliang meng Haichen Liu Ruizhi Chu Guoguang Wu Weisong Li Xiaofeng Jiang Deguang Yang School of Chemical Engineering and Technology China University of Mining&TechnologyXuzhou 221116China Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education Xuzhou 221116China

In order to further improve the catalytic performance of zeolite catalyst for methanol to aromatics(MTA)technology, the double-tier SAPO-34/ZSM-5/quartz composite zeolite films were successfully synthesized via hydrothermal crystallization. The Si/Al ratio of SAPO-34 film was used as the only variable to study this material. The composite zeolite material with 0.6Si/Al ratio of SAPO-34 has the largest mesoporous specific surface area and the most suitable acid distribution. The catalytic performance for the MTA process showed that 0.6-SAPO-34/ZSM-5/quartz film has as high as 50.3% benzene-toluenexylene selectivity and 670 min lifetime. The MTA reaction is carried out through the path we designed to effectively avoid the hydrocarbon pool circulation of ZSM-5 zeolite, so as to improve the aromatics selectivity and inhibit the occurrence of deep side reactions to a great extent. The coke deposition behavior was monitored by thermogravimetric analysis and gas chromatograph/mass spectrometer, it is found that with the increase of Si/Al ratio, the active intermediates changed from low-substituted methylbenzene to high-substituted methylbenzene, which led to the rapid deactivation of the catalyst. This work provides a possibility to employ the synergy effect of composite zeolite film synthesizing anti-carbon deposition catalyst in MTA reaction.

关键词： Composite zeolite film Methanol to aromatics Anti-carbon deposition Si/Al ratio Hydrocarbon pool circulation mechanism

Construction of a macromolecular structural model of Chinese lignite and analysis of its low-temperature oxidation behavior

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Chinese Journal of Chemical Engineering 2017年第9期25卷 1314-1321页

作者： xianliang meng Mingqiang Gao Ruizhi Chu Zhenyong Miao Guoguang Wu Lei Bai Peng Liu Yuanfang Yan Pengcheng Zhang Key Laboratory of Coal-based CO_2 Capture and Geological Storage Jiangsu Province (China University of Mining & Technology) School of Chemical Engineering and Technology China University of Mining & Technology Department of Chemical and Biomedical Engineering West Virginia University

The aim of this paper is to analyze the change in the active structure of lignite during the process of lowtemperature oxidation by constructing a molecular structure model for lignite. Using quantum computation combined with experimental results of proximate analysis, ultimate analysis, Fourier transform infrared spectroscopy(FTIR) and X-ray photoelectron spectroscopy(XPS), a structural model for the large molecular structure was constructed. By analyzing the bond lengths in the model molecule, the evolution law for the active structure of lignite was predicted for the process of low-temperature oxidation. In low-temperature oxidation,alkanes and hydroxyls are the primary active structures observed in lignite, though ether may also react. These active functional groups react with oxygen to release heat, thereby speeding up the reaction between coal and oxygen. Finally, the content of various functional groups in the process of lignite low-temperature oxidation was analyzed by infrared analysis, and the accuracy of the model was verified.

关键词： Chinese lignite Coal combustion Molecular simulation Low-temperature oxidation process Environment

A comparative investigation of the properties of coal-water slurries prepared from Australia and Shenhua coals

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Mining Science and Technology 2011年第3期21卷 343-347页

作者： Yun Zengjie Wu Guoguang meng xianliang Zhang Yuliang Shi Frank He Yaqun Luo Xiaoqiang School of Chemical Engineering and Technology China University of Mining and Technology Xuzhou 221008 China Julius Kruttschnitt Mineral Research Centre Brisbane 4068 Australia

Two coal samples of similar rank were chosen from Australia and China to investigate the differences in Coal-Water Slurry （CWS） made from them. The effect of ash content and particle size gradation on these properties was also studied. Different grinding times were used when grinding the two coals and particle size analysis of these ground coals was used to select samples with a ＂double-peak＂ particle size distri- bution. All the ＂double-peak＂ samples were used to prepare a CWS. The concentration, viscosity, fluidity, and stability of each CWS were measured. The results show that the properties ofa CWS prepared from a coal sample with a ＂double-peak＂ size distribution are better than those CWS prepared from samples with a mono-modal particle distribution. The ash content of Australian coal is 21.72g higher than the ash content of Shenhua coal. The highest coal concentration in slurry from the Australia coal is 11.01% higher than in CWS from the Shenhua coat. The fluidity and stability of the CWS prepared from the Australian coal are both better than the fluidity and stability of slurry prepared from Shenhua coal. High ash content in the Australian coal imnroves the nulning results of a CWS made from it.

关键词： Coal-Water Slurry"Double-peak" gradationSlurry ability Rheological property Stability

Effects of the grinding process on the preparation and qualities of CWS

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Mining Science and Technology 2011年第6期21卷 767-771页

作者： Yuliang Zhang Guoguang Wu xianliang meng Zengjie Yun Frank Shi Yaqun He Xiaoqiang Luo School of Chemical Engineering and Technology China University of Mining ＆ Technology Xu.zhou 221008 China Julius Kruttschnitt Mineral Research Centre Brisbane 4068 Australia

Two different grinding processes were examined to determine the effect grinding has on the quality of a CWS. A series of slurries was prepared from Australian (Au) and Chinese (YZ) coals. Both types of coal were ground by a Chinese (CUMT) and an Australian (JK) grinding process. The performance tests of the prepared CWS showed that fluidity of all slurries was acceptable. The concentration of the CWS from YZ coal ground by the CUMT grinding process was higher than when the JK grinding process was used. The highest concentration was 70.14% in this case. The concentration of the CWS prepared from Au coal by the JK grinding process was higher than when the CUMT grinding process was used. The highest con- centration in this case was 70.97%. These differences are caused by the particle size distribution devel- oped during the different grinding processes.

关键词： Coal water slurry "Double-peak" gradation Slurry ability Grinding process Stability Fluidity

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求解奇异线性方程组的双逐次投影法

温州大学学报（自然科学版） 2009年第5期30卷 27-33页

作者：孟宪亮温州大学数学与信息科学学院浙江温州325035

用双逐次投影迭代法来求解奇异线性方程组,当线性方程组的系数矩阵是对称半正定时,给出了不同情形时有关参量的选取以及相应的算法,并就收敛结果分别与雅可比迭代法和Gauss-Seidel迭代法进行了比较,数值结果表明,该方法对求解奇异线性... 详细信息

用双逐次投影迭代法来求解奇异线性方程组,当线性方程组的系数矩阵是对称半正定时,给出了不同情形时有关参量的选取以及相应的算法,并就收敛结果分别与雅可比迭代法和Gauss-Seidel迭代法进行了比较,数值结果表明,该方法对求解奇异线性方程组是很有效的.

关键词：双逐次投影法奇异线性方程组内积对称半正定矩阵