期刊文献+
共找到12篇文章
< 1 >
每页显示 20 50 100
深部煤层CO_2注入过程中煤体积参数变化的模拟实验 被引量:4
1
作者 张琨 桑树勋 刘长江 《煤田地质与勘探》 CAS CSCD 北大核心 2018年第5期26-31,共6页
CO_2注入煤层会改造储层孔裂隙结构,对提高CO_2埋藏和强化甲烷抽采能力产生重要影响。为探究CO_2注入后的煤体结构演化规律,选择山西沁水盆地寺河矿无烟煤和新源矿焦煤样品进行模拟实验,通过测试并分析CO_2注入前后煤体积参数的变化,得... CO_2注入煤层会改造储层孔裂隙结构,对提高CO_2埋藏和强化甲烷抽采能力产生重要影响。为探究CO_2注入后的煤体结构演化规律,选择山西沁水盆地寺河矿无烟煤和新源矿焦煤样品进行模拟实验,通过测试并分析CO_2注入前后煤体积参数的变化,得到以下结论:CO_2的注入可以溶蚀煤中矿物,增加连通孔隙体积并引起有机质的膨胀;矿物溶蚀对孔隙体积变化的贡献不显著,却导致大量封闭孔转换为连通孔,其中大于40μm的大孔孔隙体积增幅最大;有机质的膨胀量较大,其对孔隙的挤压作用可能会降低煤体的连通性;CO_2注入对煤体结构的改造作用受煤级和模拟埋深条件的共同影响。 展开更多
关键词 CO2地质存储 煤体积 矿物溶蚀 基质膨胀
下载PDF
大型散堆料煤体积测量系统的开发应用 被引量:3
2
作者 李保社 赵荣阁 李宏远 《华北电力技术》 CAS 北大核心 2000年第1期3-5,共3页
滦河发电厂1998 年8 月安装了VID-01A 型散堆物料体积测量系统。1999 年7 月29日通过华北电力集团公司技术评审,系统重复误差小于2% 。该系统采用目前国际领先的立体视觉测量技术,利用不规则物体模糊测量理论系... 滦河发电厂1998 年8 月安装了VID-01A 型散堆物料体积测量系统。1999 年7 月29日通过华北电力集团公司技术评审,系统重复误差小于2% 。该系统采用目前国际领先的立体视觉测量技术,利用不规则物体模糊测量理论系统以及计算机控制系统快速、准确、方便的数据计算功能和处理技术,实现了大型煤场不规则物料存储量的自动化测量。 展开更多
关键词 煤体积 散堆物料 爆场 测量系统
下载PDF
基于图像处理的皮带机上煤量体积计量 被引量:10
3
作者 贺杰 王桂梅 +1 位作者 刘杰辉 杨立洁 《计量学报》 CSCD 北大核心 2020年第12期1516-1520,共5页
为了实现皮带机上煤体积实时计量,提出了一种基于图像处理技术实现皮带上煤量计量方法。通过线激光仪器和工业相机进行皮带机煤图像采集,首先对图像进行预处理,包括滤波、灰度化、二值化;然后通过图像膨胀减少骨架提取的毛刺现象,根据... 为了实现皮带机上煤体积实时计量,提出了一种基于图像处理技术实现皮带上煤量计量方法。通过线激光仪器和工业相机进行皮带机煤图像采集,首先对图像进行预处理,包括滤波、灰度化、二值化;然后通过图像膨胀减少骨架提取的毛刺现象,根据获取的空载无煤时刻的基线与实时获取的激光线,通过对比形成煤轮廓;计算出皮带上煤量截面积,根据截面积与皮带机带速关系实现皮带上煤量体积计量。通过在皮带机不同带速下进行试验测量,最大误差为4.2%,最小误差为0.9%,并且运行稳定。 展开更多
关键词 计量学 煤体积计量 皮带机 图像处理 实时量计量
下载PDF
面向煤矸体积检测的图像特征匹配算法研究
4
作者 曹现刚 袁娜 +2 位作者 王鹏 吴旭东 岳东 《煤炭技术》 CAS 北大核心 2023年第2期175-178,共4页
针对煤矸体积检测过程中,SIFT特征匹配算法因时间复杂度高无法满足实时性要求,提出一种基于BRIEF描述子的改进SIFT算法。首先利用BRIEF描述子替代SIFT算法的128维特征向量,利用最小距离筛选机制结合RANSAC算法完成误匹配点对的去除。实... 针对煤矸体积检测过程中,SIFT特征匹配算法因时间复杂度高无法满足实时性要求,提出一种基于BRIEF描述子的改进SIFT算法。首先利用BRIEF描述子替代SIFT算法的128维特征向量,利用最小距离筛选机制结合RANSAC算法完成误匹配点对的去除。实验证明:提出的算法相较SIFT算法匹配速度提高了41.3%,而煤矸体积计算速度提高了20.2%。 展开更多
关键词 体积 双目视觉 特征匹配 SIFT BRIEF
下载PDF
基于双目视觉的动态煤量测量方法 被引量:3
5
作者 董立红 宋伟思 符立梅 《煤炭科学技术》 CAS CSCD 北大核心 2022年第8期196-203,共8页
煤矿井下带式输送机主运输面煤量测重设施不完善。在复杂的煤矿井下环境中,皮带秤的测重方法对其精度有很高的要求、易受到人为操作,使得测量误差较大,难以获得真实的煤产量数据;激光三维扫描的测重系统价格昂贵,难以普遍使用。根据煤... 煤矿井下带式输送机主运输面煤量测重设施不完善。在复杂的煤矿井下环境中,皮带秤的测重方法对其精度有很高的要求、易受到人为操作,使得测量误差较大,难以获得真实的煤产量数据;激光三维扫描的测重系统价格昂贵,难以普遍使用。根据煤矿井下带式输送机主运输面煤量测量问题存在的不足,针对性地提出一种基于双目视觉的动态不规则物体测重方法。首先,采用双目相机获取煤矿井下带式输送机主运输工作面的左右俯视图,研究适用于煤矿井下图像特点的预处理方法;接着根据双目视觉的原理采用改进的半全局块匹配算法(Semi-Global Block Matching, SGBM)计算得到密集视差图并对视差图进行空洞填充以消除误匹配点;再对填充后的的视差图采用改进的分水岭分割算法将视差图中的原煤目标分离出来;然后在采用基于三角测量的方法恢复各点的深度信息后计算其对应点的三维信息;在三维信息的基础上提出了一种新的动态不规则体积测量方法计算带式输送机表面的原煤体积;最后,应用煤量计算公式完成煤量测量。用双目相机获取真实煤矿图像进行试验,证明所提方案的有效性。研究表明:该系统所需的硬件设备为一个质量轻、体积小的双目摄像机,能实时采集到目标图像和距离;真实重量和测量重量误差低于10%,为煤矿井下煤量测量提出了一种有效的方案,能够满足实际煤矿井下煤产量的估计需求。 展开更多
关键词 矿图像 带式输送机 双目视觉 煤体积估计 分水岭图像分割
下载PDF
临汾区块煤层气井排采过程中煤粉产出规律 被引量:9
6
作者 魏迎春 张傲翔 +2 位作者 王孝亮 张晓玉 曹代勇 《辽宁工程技术大学学报(自然科学版)》 CAS 北大核心 2016年第7期673-678,共6页
为研究煤层气井排采过程中煤粉产出规律以及制定合理的煤粉管控措施,选取山西临汾煤层气区块为研究对象,基于煤层气井产出煤粉体积分数的现场连续监测,利用测井曲线解释构造煤的方法,对临汾区块煤层气井产出的煤粉体积分数进行了分析,... 为研究煤层气井排采过程中煤粉产出规律以及制定合理的煤粉管控措施,选取山西临汾煤层气区块为研究对象,基于煤层气井产出煤粉体积分数的现场连续监测,利用测井曲线解释构造煤的方法,对临汾区块煤层气井产出的煤粉体积分数进行了分析,揭示了煤粉体积分数在空间和时间两方面上的产出规律,预测了产出煤粉体积分数的高值区和高发期,提出了合理的煤粉管控措施.研究结果表明:产出煤粉体积分数在空间上由东向西逐渐增加,由北向南呈高-低-高的变化趋势,主要受构造煤发育程度影响,构造煤发育区是产出煤粉体积分数的高值区;在时间上,排水降压阶段产出煤粉体积分数小,平均值为4.2%,憋压排采阶段和产气上升阶段产出煤粉体积分数增大,平均值分别为5.3%和5.5%.憋压排采和产气上升阶段是产出煤粉体积分数的高值期. 展开更多
关键词 临汾区块 层气 体积分数 产出规律 管控措施
下载PDF
张小楼井田测井评价煤层瓦斯含量的研究
7
作者 王利宏 吕志领 王凯平 《煤炭科技》 2000年第4期14-15,共2页
通过对原生煤体积模型的研究 ,建立了测井参数与地质参数之间的响应方程。并结合实际 ,利用回归分析法 ,提出瓦斯预测公式 。
关键词 眼一化 原生煤体积模型 测井参数 地质参数 瓦斯含量
下载PDF
Research on Pressure Drop Performance of the Packing-Flotation Column 被引量:9
8
作者 LIU Jiong-tian ZHANG Min +1 位作者 LI Yan-feng LU Yang 《Journal of China University of Mining and Technology》 EI 2006年第4期389-392,共4页
A packing-flotation column was proposed to optimize the flotation environment A research system was es- tablished using a 100 mm diameter cyclonic micro-bubble flotation column to study fluid properties. Dry-plate and... A packing-flotation column was proposed to optimize the flotation environment A research system was es- tablished using a 100 mm diameter cyclonic micro-bubble flotation column to study fluid properties. Dry-plate and wet- plate pressure drops were studied and the corresponding pressure drop equations developed. The results show that the dry-plate pressure drop of the packing cyclonic micro-bubble flotation column is 10–15 times less than that of the chemical tower, which is principally shown in its relatively small resistance coefficient, ξ ≈0.0207. The wet-plate pressure drop is 2–3 times higher than that of the chemical tower, which is largely caused by the separation materials and characteristics of the equipment. With flotation, the greater the pressure drop, the better the flotation environment. 展开更多
关键词 sieve plate PACKING flotation column pressure drop
下载PDF
Research on the influence of the fly ash on the concrete carbonation 被引量:2
9
作者 Chen Ce Zhong Jianchi 《Engineering Sciences》 EI 2011年第2期93-96,共4页
The influence of fly ash on the fresh properties, mechanical properties and carbonation properties were studied in this paper. The performance of a kind of curing agent which was applied to the hardened concrete surfa... The influence of fly ash on the fresh properties, mechanical properties and carbonation properties were studied in this paper. The performance of a kind of curing agent which was applied to the hardened concrete surface was evaluated. Incorporating large volume of fly ash will risk the concrete carbonation. The curing agent could prevent the concrete carbonation, and the mechanism was explained. 展开更多
关键词 CONCRETE fly ash curing agent
下载PDF
Some improvements of the marching cubes algorithm for the rendering of an orebody 被引量:4
10
作者 LI Chun-min LI Zhong-xue +1 位作者 WANG Yun-hai HAO Xiu-qiang 《Journal of China University of Mining and Technology》 EI 2008年第2期194-198,共5页
Orebody-rendering techniques are developed using the marching cubes (MC) algorithm. The shape of an orebody is viv- idly displayed in real time and can be used to guide mining design as well. The MC algorithm has been... Orebody-rendering techniques are developed using the marching cubes (MC) algorithm. The shape of an orebody is viv- idly displayed in real time and can be used to guide mining design as well. The MC algorithm has been improved in two aspects. By analyzing the principles of the MC algorithm, as well as the features of the specific application, improvements were developed to: eliminate ambiguities by using a unified isosurface constructing method in the voxels, and improve the operating efficiency of the MC algorithm by incorporating an octree structure. The analytical results of the examples demonstrate the effectiveness of our proposal. 展开更多
关键词 underground mines marching cubes algorithm 3D visualization OCTREE
下载PDF
Methane adsorption-induced coal swelling measured with an optical method 被引量:3
11
作者 Tang Shuheng Wan Yi +2 位作者 Duan Lijiang Xia Zhaohui Zhang Songhang 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第6期949-953,共5页
In order to quantify the effect of matrix shrinkage on reservoir permeability during coalbed methane production, coal samples from Huozhou, Changzhi and Jincheng areas in Shanxi province (classified as high-volatile ... In order to quantify the effect of matrix shrinkage on reservoir permeability during coalbed methane production, coal samples from Huozhou, Changzhi and Jincheng areas in Shanxi province (classified as high-volatile bituminous coal, low-volatile bituminous coal and anthracite, respectively) were collected, and adsorption-induced coal swelling in methane were determined by an optical method at 40 ℃ and pressure up to 12 MPa. All three coals showed similar behavior-that swelling increased as a function of pressure up to about 10 MPa but thereafter no further increase in swelling was observed. Swelling in the direction perpendicular to the bedding plane is greater than that parallel to the bedding plane, and the differences are about 7.77-8.33%. The maximum volumetric swelling ranges from 2.73% to 3.21 %-increasing with increasing coal rank. The swelling data can be described by a modified DR model. In addition, swelling increases with the amount of adsorption. However, the increase shows a relatively slower stage followed by a relatively faster stage instead of a linear increase. Based on the assumption that sorption-induced swelling/shrinkage of coal in methane is reversible, the permeability increases induced by coal shrinkage during methane desorption was analyzed, and the results indicate that the permeability change is larger for higher rank coal in the same unit of pressure depletion. 展开更多
关键词 CoalAdsorptionMethaneSwellingPermeability
下载PDF
A 3D numerical simulation of laser-induced incandescence of soot particles in coal combustion products 被引量:2
12
作者 Ling-hong CHEN Ke-fa CEN +1 位作者 Annie GARO Gerard GREHAN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第9期1320-1326,共7页
Laser-induced incandescence (LII) has received increasing attention as a potentially powerful technique for in-situ measuring of the volume fraction and primary size of soot particles in combustion systems. In this st... Laser-induced incandescence (LII) has received increasing attention as a potentially powerful technique for in-situ measuring of the volume fraction and primary size of soot particles in combustion systems. In this study, a 3D Monte Carlo simulation combined with a Mie equation was developed to analyze the influence of spectral absorption and scattering on the measured LII flux emitted by soot particles. This paper represents a first attempt to analyze soot measurement using the LII technique in coal combustion products. The combustion products of gases (CO2, N2), soot, and fly-ash particles, present between the location of laser-excited soot and the LII flux receiver. The simulation results indicated that an almost Beer-Lambert exponential decrease in LII flux occurred with an increase in the volume fraction of soot particles, while a nearly linear decrease occurred with an increase in the volume fraction of fly-ash particles. The results also showed that scattering effects of both soot and fly-ash particles on the LII flux could be neglected. Compared with the absorption of gases, a decrease of 20% of LII flux was observed with soot particles, and a decrease of 10% with fly-ash particles. 展开更多
关键词 Laser-induced incandescence (LII) SOOT FLY-ASH 3D Monte Carlo SCATTERING ABSORPTION
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部