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Frontiers of Chemical Science and Engineering 2021年第3期15卷 518-527页

作者： Yixin Zhang Lu Zhou Liqing Chen Yang guo fanhui guo Jianjun Wu Baiqian Dai National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China School of Chemistry Monash UniversityVictoria 3800Australia Department of Chemical Engineering Monash UniversityVictoria 3800Australia

The coal fly ash produced by gasification is estimated to be over 80 million ton per year in China by *** has mainly been disposed as solid waste by *** is lack of study focused on its *** this paper,the coal fly ash produced by gasification was at first analyzed and then applied to synthesize zeolite as an *** effects of synthesis conditions on the cation exchange capacity(CEC)of zeolite were *** results from X-ray diffraction and scanning electron microscope indicated that the crystallinity of the synthesized zeolite is the most important factor to affect the *** the synthesized zeolite with the highest CEC(275.5 meq/100 g)was used for the adsorption of Cr(Ⅵ) from aqueous solution,the maximum adsorption capacity for Cr(Ⅵ) was found to be 17.924 mg/*** effects of pH,contact time and initial concentration on the adsorption of Cr(Ⅵ) were also *** adsorption kinetics and isotherms can be well described by the pseudo-secondorder model and Langmuir isotherm model,respectively.

关键词： coal fly ash gasification zeolite Na-P1 chromium(Ⅵ)

Experimental study on the effects of drying methods on the stabilities of lignite

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Chinese Journal of Chemical Engineering 2018年第7期26卷 1545-1554页

作者： Yixin Zhang Jixiang Dong fanhui guo Xiaokai Chen Jianjun Wu Zhenyong Miao National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

The drying processes are always applied prior to the transportation or utilization of lignite, and result in notable changes in the stabilities of lignite. In this paper, the study on the effects of nitrogen and MTE drying process on the physico-chemical properties and stabilities of Zhaotung lignite was carried out. The briquettes produced by MTE drying in this study were 150 mm in dimension, and so had a much larger particle size than nitrogen- dried samples. Nitrogen adsorption, mercury intrusion porosimetry and scanning electron microscopy all suggested that drying was accompanied by the transformation of larger pores into smaller ones. Compared to nitrogen drying, the pore structures could be stabilized by the MTE process. The soluble salts were removed during MTE drying which resulted in the decrease in ash and the concentrations of some of the major metals. The removal of water enhanced the hydrophilicity of nitrogen dried samples, but did not affect the hydrophilicity of MTE dried samples. The moisture holding capacity of MTE dried samples reduced faster than nitrogen dried samples with the decrease of residual moisture content. The moisture readsorption processes of MTE dried sam- ples were strongly inhibited due to the much larger particle size of sample produced by MTE drying than nitrogen drying. The susceptibility to spontaneous combustion, indicated by cross point temperature and self-heating tests, of nitrogen and MTE dried samples increased with the decrease of residual moisture content. The MTE dried samples are more liable to spontaneous combustion than nitrogen dried samples with the same residual moisture and particle size. However, the larger particle size of the MTE product made it more stable with respect to spontaneous combustion and also moisture readsorption.

关键词： Lignite Mechanical thermal expression Stability Hydrophilidty Readsorption Spontaneous combustion

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煤气化细渣陶瓷膜真空脱水试验与数值模拟

化工进展 2022年第8期41卷 4047-4056页

作者：郭凡辉武建军张海军郭旸刘虎张一昕中国矿业大学化工学院江苏徐州221116 中国矿业大学国家煤加工与洁净化工程技术研究中心江苏徐州221116

气化细渣是煤炭气化过程的废弃物,高效脱水是其资源化利用、减量化处置的必要前提。本文采用陶瓷膜真空过滤系统开展了脱水实验并对脱水过程进行了数值模拟。气化细渣料浆浓度和液下吸附时间影响滤饼厚度且滤饼厚度增加导致水分运移路... 详细信息

气化细渣是煤炭气化过程的废弃物,高效脱水是其资源化利用、减量化处置的必要前提。本文采用陶瓷膜真空过滤系统开展了脱水实验并对脱水过程进行了数值模拟。气化细渣料浆浓度和液下吸附时间影响滤饼厚度且滤饼厚度增加导致水分运移路径增长,使得有效脱水时间增加;滤饼脱水过程的脱水速率值呈现非线性降低趋势且滤饼水分极限值为40%,这与气化细渣物化性质有关;真空度>0.08MPa时气化细渣滤饼中“通道水”能够在约24s有效脱除。Fluent数值模拟过程选用了欧拉模型并确定了陶瓷膜滤板和气化细渣滤饼的阻力系数,脱水过程的实验值与模拟结果误差小于5%,证实了模型可靠性。模拟过程分析了气化细渣脱水过程中压力场和水分含量分布云图的演变规律,结果表明,增加脱水系统真空度、降低滤饼厚度、提高“通道水”比例以及增大气化细渣颗粒等效当量直径能够提高气化细渣脱水效率。此外,陶瓷膜真空脱水过程所得滤液洁净度高且部分指标达到了工业用水的标准。

关键词：煤气化细渣陶瓷膜过滤脱水特性数值模拟

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粒径对褐煤非薄层干燥及干燥褐煤自燃与复吸特性的影响

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煤炭学报 2022年第5期47卷 2096-2105页

作者：张一昕贾文科郭旸王如梦郭凡辉武建军中国矿业大学国家煤加工与洁净化工程技术研究中心江苏徐州221116 中国矿业大学化工学院江苏徐州221116

研究了非薄层状态下昭通褐煤粒径对其干燥及干燥褐煤自燃、复吸特性的影响。采用褐煤非薄层干燥实验装置,测定了不同粒度褐煤非薄层干燥残留水分含量变化,实验结果表明粒度较小的样品具有较高的干燥速率,当褐煤粒度降低至临界粒度(2~5 ... 详细信息

研究了非薄层状态下昭通褐煤粒径对其干燥及干燥褐煤自燃、复吸特性的影响。采用褐煤非薄层干燥实验装置,测定了不同粒度褐煤非薄层干燥残留水分含量变化,实验结果表明粒度较小的样品具有较高的干燥速率,当褐煤粒度降低至临界粒度(2~5 mm)时,进一步降低粒度不会促进褐煤干燥速率的提升;非薄层干燥过程中仅观察到了升速干燥阶段和降速干燥阶段,且最大干燥速率显著低于褐煤薄层干燥研究中的最大干燥速率;褐煤非薄层干燥中样品温度、残留水分为非均匀分布,通过数值模拟发现样品表层和中心区域温度、残留水分存在显著的梯度,温度、残留水分分布呈现分层现象,温度分布数值模拟结果在褐煤非薄层干燥中试实验中得到验证。采用交叉点温度法与绝热氧化速率法测定了干燥后褐煤的自燃特性,在交叉点温度测试过程中自然对流主导热质传递,小于临界粒度时进一步减小褐煤粒度其交叉点温度无明显变化;在绝热氧化速率测试过程中强制对流主导热质传递,绝热氧化速率随褐煤粒度减小持续降低。干燥后褐煤非薄层复吸时,粒度较小的样品具有较高的复吸速率,当褐煤粒度降低至临界粒度时,进一步降低粒度不会导致复吸速率的增加。非薄层状态下褐煤干燥及干燥褐煤自燃与复吸特性均与薄层状态下有显著差异,临界粒度对于褐煤干燥具有重要意义,在临界粒度范围进行干燥可在保证干燥速率的同时降低破碎成本,且不会导致自燃倾向性与复吸速率提升。

关键词：褐煤非薄层干燥临界粒度自燃复吸

宁东煤气化细渣及其碳灰分离产物物理化学性质

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煤炭学报 2021年第S02期46卷 1096-1104页

作者：张一昕郭旸王如梦贾文科郭凡辉武建军中国矿业大学国家煤加工与洁净化工程技术研究中心江苏徐州221116 中国矿业大学化工学院江苏徐州221116

煤气化是煤炭清洁高效利用的关键技术,煤气化过程中产生了大量的细渣,细渣中复杂的碳-灰交融状态以及高水分含量限制了其资源化利用,碳灰分离是煤气化细渣资源化利用的必要前提。本研究采用泡沫浮选法对宁东地区3种不同气化工艺产生的细... 详细信息

煤气化是煤炭清洁高效利用的关键技术,煤气化过程中产生了大量的细渣,细渣中复杂的碳-灰交融状态以及高水分含量限制了其资源化利用,碳灰分离是煤气化细渣资源化利用的必要前提。本研究采用泡沫浮选法对宁东地区3种不同气化工艺产生的细渣(SNB1细渣,XTY细渣和JC细渣)进行碳灰分离,分析了气化细渣及其碳灰分离产物的基本物性和持水能力,并借助傅里叶变换红外光谱仪、扫描电子显微镜和物理吸附仪研究,对比了气化细渣及其碳灰分离产物物理化学结构差异,以期为气化细渣的低成本处置与资源化利用提供参考。结果表明:通过泡沫浮选可以将3种细渣中的碳-灰进行不同程度的分离,泡沫浮选过程可以有效地将“游离”的球形矿物质颗粒与残碳颗粒进行分离,残碳表面和孔内灰颗粒相对更难去除。其中SNB1细渣的碳-灰分离效果最好,SNB1残碳中灰分降低至38.65%,SNB1尾灰中的灰分高达99.16%。经过泡沫浮选后,残碳和尾灰的持水能力相较于对应原气化细渣均有不同程度的降低,其中3种尾灰持水能力的降幅尤为显著(79.34%~96.61%)。此外,气化细渣及其碳灰分离产物中存在大量的圆柱形孔,碳-灰分离过程使得部分阻塞残碳颗粒中孔的微细球形矿物质颗粒脱离,从而使得残碳中微孔和中孔的数目增加,比表面积增大,而尾灰中主要以球形矿物质颗粒相互熔融而形成的缝隙中孔为主。碳灰分离过程使得部分夹带在残碳孔道内部的亲水性较强的微细球形矿物质颗粒被泡沫浮选过程去除,二氧化硅亲水位点相对减少,这使得3种残碳的持水能力相对于原气化细渣都有所降低。3种尾灰由于具有较低的比表面积(29.383~46.875 m^(2)/g),因而具有更低的持水能力。

关键词：煤气化细渣碳灰分离持水能力化学结构微观形貌孔隙结构

An optimal fracture geometry design method of fractured horizontal wells in heterogeneous tight gas reservoirs

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Science China(Technological Sciences) 2016年第2期59卷 241-251页

作者： ZENG fanhui KE YuBiao guo JianChun State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation Southwest Petroleum University

In this work, the unified fracture design （UFD） is extended for the first time to the fractured horizontal wells in heterogeneous closed box-shaped tight gas reservoirs. Utilizing the direct boundary element method and influence function, the dimensionless fracture productivity index is obtained and expressed in the function of proppant volume and fracture geometry at the pseu- do-steady state. With the iterative method, the effectively propped permeability, kfe, is corrected using the i^-situ Reynolds number, NRe. The goal of this paper is to present a new UFD extension to design the proppant volume and the optimal fracture geometry. The results show that there exists an optimal proppant volume for a certain reservoir. The small aspect ratio （yJXe） and high permeability reservoirs need short and wide fractures to diminish the non-Darcy effect. On the contrary, long and narrow fractures are required for the large aspect ratio and low permeability reservoirs. A small proppant volame is prone to creating long fractures, while a relatively large proppant volume creates wide fractures. The new extension can be used to evaluate the previous fracture parameters and design the following fracture parameters of the fractured horizontal well in heterogeneous tight gas reservoirs, with the non-Darcy effect taken into account.

关键词： tight gas reservoir heterogeneity non-Darcy effect fractured horizontal well fracture geometry design

Numerical simulation of 23 June 2016 Yancheng City EF4 tornadic supercell and analysis of lightning activity

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Science China Earth Sciences 2017年第12期60卷 2204-2213页

作者： guo FengXia LI Yang HUANG ZhaoChu WANG ManFei ZENG fanhui LIAN ChunHao MU YiJun key laboratory of meteorological disaster ministry of education(klme)joint international research laboratory of climate and environment change(ilcec)collaborative innovation center on forecast and evaluation of meteorological disaster(cic-femd)key laboratory for aerosol-cloud-precipitation of china meteorological administrationnanjing university of information science&technologyNanjing 210044China

Based on the Weather Research Forecasting(WRF) model that features charging and discharging parameterization,relationships between tornado, hail and lightning were investigated for a tornado-producing(EF4 intensity) supercell thunderstorm over Yancheng City in Jiangsu Province, China, on 23 June 2016. Based on a sounding at 0800, there was a low lifting condensation level, substantial convective available potential energy(CAPE), and strong vertical wind shear near Yancheng City, which promote supercell development. At 1400, observations revealed that hail production and a dramatic increase of positive cloud-to-ground flash rates occurred simultaneously, maximizing five minutes later. The tornado occurred 30 min after the hail production. The time of minimum positive cloud-to-ground flash rates was 15 min later. The simulation indicated that the tornadic supercell moved eastward and that positive cloud-to-ground flash rates increased dramatically at 1400, the same as observed, but their maximum was 5 min later than observed. The simulated updraft volume peaked at 1425 and the simulated downdraft volume maximized5 min later, when the mesocyclone formed. Simulated reflectivities showed no hook echo and horizontal winds for different height at mid-low levels had a different cyclonic shear at 1430, favorable to mesocyclone formation. Based on the simulated results,the region of positively charged graupel ascended resulting from the region of high liquid water content was lifted by the strong updraft, forming a mid-level strong positive charge region. A lower negative charge region formed by the inductive charging mechanism of collisions between graupel and droplets at the bottom of the cloud, conducive to positive cloud-to-ground flashes.

关键词： Tornado Supercell WRF Hail Positive cloud-to-ground flashes

Optimization of refracturing timing for horizontal wells in tight oil reservoirs: A case study of Cretaceous Qingshankou Formation, Songliao Basin, NE China

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Petroleum Exploration and Development 2019年第1期46卷 153-162页

作者： guo Jianchun TAO Liang ZENG fanhui State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation in Southwest Petroleum University

Tight oil reservoirs in Songliao Basin were taken as subjects and a novel idealized refracturing well concept was proposed by considering the special parameters of volume fracturing horizontal wells, the refracturing potential of candidate wells were graded and prioritized, and a production prediction model of refracturing considering the stress sensitivity was established using numerical simulation method to sort out the optimal refracturing method and timing. The simulations show that: with the same perforation clusters, the order of fracturing technologies with contribution to productivity from big to small is refracturing between existent fractured sections, orientation diversion inside fractures, extended refracturing, refracturing of existent fractures; and the later the refracturing timing, the shorter the effective time. Based on this, the prediction model of breakdown pressure considering the variation of formation pressure was used to find out the variation pattern of breakdown pressure of different positions at different production time. Through the classification of the breakdown pressure, the times of temporary plugging and diverting and the amount of temporary plugging agent were determined under the optimal refracturing timing. Daily oil production per well increased from 2.3 t/d to 16.5 t/d in the field test. The research results provide important reference for refracturing optimization design of similar tight oil reservoirs.

关键词： Songliao Basin tight oil reservoirs refracturing volume fracturing breakdown pressure temporary plugging and diverting

Genetic variants in the 6p21.3 region influence hepatitis B virus clearance and chronic hepatitis B risk in the Han Chinese population

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Liver Research 2024年第1期8卷 54-60页

作者： Jiancheng Huang Mingkuan Su fanhui Kong Hongbin Chen Shuiqing Wu Jianfeng guo Haiying Wu Department of Laboratory Medicine Mindong Hospital Affiliated to Fujian Medical UniversityFuanFujianChina Department of Gastroenterology Mindong Hospital Affiliated to Fujian Medical UniversityFuanFujianChina

Background and aim:A genome-wide association study has indicated the association of numerous genes in the 6p21.3 region with chronic hepatitis B virus(HBV)*** this study,we screened 12 representative single-nucleotide polymorphisms(SNPs)from the 6p21.3 region and investigated their association with the risk of chronic hepatitis B(CHB)to better understand the molecular etiology un-derlying CHB risk in the Han Chinese ***:Between March 2021 and November 2022,we included 183 patients with CHB(case group)and 196 with natural HBV clearance(control group).Allele typing of the selected SNPs was performed using snapshot *** correlation between the 12 chosen SNPs and the risk of chronic HBV infection was examined using binary logistic regression *** genes of the variants were identified,and expression quantitative trait loci(eQTL)were analyzed using the 3DSNP ***:We validated 12 previously reported CHB susceptibility sites,including rs1419881 of tran-scription factor 19(TCF19),rs3130542 and rs2853953 of human leukocyte antigen(HLA)-C,rs652888 of euchromatic histone-lysine-methyltransferase 2(EHMT2),rs2856718,rs9276370,rs7756516,and rs7453920 of HLA-DQ,rs378352 of HLA-DOA,and rs3077,rs9277535,and rs9366816 of *** regression analyses revealed that polymorphisms such as rs9276370,rs7756516,rs7453920,rs3077,rs9277535,and rs9366816 were positively correlated with natural HBV clearance in the dominant ***,rs3130542 and rs378352 were identified as risk factors for *** analysis revealed that rs9276370,rs7756516,and rs7453920 in HLA-DQ were TTG and GCA *** the TTG haplotype was positively correlated with a higher risk of CHB,the GCA haplotype significantly influenced the natural clearance of *** analysis demonstrated that rs378352,rs3077,and rs9366816 were located within enhancer states;rs3077 and rs9366816 overlapped with nine tran-scription factor-bindi

关键词： Chronic hepatitis B(CHB) Expression quantitative trait loci(eQTL) Haplotype Hepatitis B virus(HBV) Human leukocyte antigen(HLA) Single-nucleotide polymorphism(SNP)

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裂缝变缝宽形态对压裂井长期产能的影响

中国石油大学学报（自然科学版） 2015年第1期39卷 111-115页

作者：郭建春刘恒曾凡辉西南石油大学油气藏地质及开发工程国家重点实验室四川成都610500 西南石油大学石油与天然气工程学院四川成都610500

基于流体扩散理论和势叠加原理,采用半解析方法研究盒形封闭边界下垂直裂缝压裂井的油藏渗流和裂缝流动过程并建立相应数学模型,对压裂井的不稳定产能进行预测,并对裂缝非均匀流入剖面进行模拟。结果表明:生产初期,流入量集中于近井筒... 详细信息

基于流体扩散理论和势叠加原理,采用半解析方法研究盒形封闭边界下垂直裂缝压裂井的油藏渗流和裂缝流动过程并建立相应数学模型,对压裂井的不稳定产能进行预测,并对裂缝非均匀流入剖面进行模拟。结果表明:生产初期,流入量集中于近井筒附近的裂缝,进入拟稳态阶段后流入量集中于裂缝趾部;裂缝沿缝长变窄的形态在生产初期不影响产能,由于流体流入裂缝的位置向裂缝趾部集中,裂缝趾部越窄,产量越低;拟稳态阶段时,等缝宽与变缝宽裂缝间的累积产量差距加大,产量差距主要集中于裂缝后1/3区域,该区域贡献了裂缝约一半的累积产量。加宽裂缝趾部缝宽能提高和保持压裂井在拟稳态阶段的产量,对压裂井的稳产、高产具有意义。

关键词：油藏流体扩散不稳定产能变缝宽流入剖面压裂井