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矿井主斜井智能分煤系统的设计与应用 被引量:1
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作者 赵二敏 《自动化应用》 2023年第4期82-85,共4页
本文从主斜井输送机的智能分煤卸料需求出发,使用Solidworks实体建模设计工具和FEA有限元分析模拟技术,设计出具备3种智能卸料方式的分煤系统。该系统投入运行后,有效解决了以往运输过程中存在的卸料瓶颈问题,经核算,因运力提升带来的... 本文从主斜井输送机的智能分煤卸料需求出发,使用Solidworks实体建模设计工具和FEA有限元分析模拟技术,设计出具备3种智能卸料方式的分煤系统。该系统投入运行后,有效解决了以往运输过程中存在的卸料瓶颈问题,经核算,因运力提升带来的增益每月可达约2980万元,对存在同类运力制约问题的矿井具有参考意义。 展开更多
关键词 输送机 分煤系统 智能 液压系统 电气系统
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平煤三矿地面煤场分煤系统的优化
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作者 蒋丽凤 蒋升升 《中州煤炭》 2012年第3期77-78,80,共3页
平煤股份三矿原地面生产系统为简易的翻煤架系统,近年来随着矿井生产能力的提高,矿井提升形式转为高效的箕斗提升,故低效高耗的生产系统已无法适应目前的生产要求。对平煤三矿原有地面生产系统存在问题进行了分析,提出了地面煤场分煤系... 平煤股份三矿原地面生产系统为简易的翻煤架系统,近年来随着矿井生产能力的提高,矿井提升形式转为高效的箕斗提升,故低效高耗的生产系统已无法适应目前的生产要求。对平煤三矿原有地面生产系统存在问题进行了分析,提出了地面煤场分煤系统的优化方案,配备了以机尾为中心、整套钢构胶带能够旋转的新型分煤胶带,实现了储煤场的全范围均匀储煤,大大提高了地面生产系统的效率及效益。 展开更多
关键词 地面 分煤系统 地面生产系统
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三矿十号井地面煤场分煤系统的优化改造
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作者 李鹏飞 张水旺 吴二锋 《科技与生活》 2012年第5期159-159,185,共2页
介绍了地面煤场分煤系统的优化改造,以机尾为中心,采用可旋转的新型分煤胶带,完善了系统,增设振动筛,实现了储煤场的全范围均匀储煤,省去了扩散原煤的推土机,大大提高了地面生产系统的效率。
关键词 地面 分煤系统 优化
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液压系统在选煤厂分煤环节中的应用与推广
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作者 林放 《科技情报开发与经济》 2010年第7期225-226,共2页
分析了太原选煤厂原煤分煤系统中存在的问题,提出技术改造方案,通过实施新技术取得了良好效果。
关键词 太原选 分煤系统 技术改造
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入炉煤分炉计量系统改进 被引量:2
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作者 郝丽芬 冷晓芳 《电力学报》 2002年第3期192-194,共3页
分析了太原第一热电厂原分炉计量系统的误差因素及改进的必要性 。
关键词 入炉炉计量系统 热电厂 技术改进 皮带秤
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基于Modicon984-785E型PLC入炉煤分计量系统设计
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作者 黄芳 刘济 《微计算机信息》 2001年第10期3-4,共2页
本文介绍了PLC在入炉煤分计量系统中的设计实例,阐述系统软硬件设计的特点,并介绍了实际工程调试中的问题及其解决方案。
关键词 火力发电厂 PCL 入炉计量系统 Modicon984-765E型
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利用PLC进行分炉煤量计量系统设计
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作者 叶强 《新疆电力》 2003年第2期55-56,共2页
大电厂一般采用皮带秤进行煤量计量,但是皮带秤计量的是总煤量,不能计量进入每台锅炉的煤量,无法准确的衡量每台锅炉的经济效率。实时准确反映每台锅炉每个仓的用煤量具有重要的意义。
关键词 锅炉 量计量系统 系统设计 PLC 可编程序控制器 皮带秤
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Improved wavelet analysis in enhancing Electromagnetic Campatibility of underground monitoring system in coal mine 被引量:2
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作者 孙继平 马凤英 +1 位作者 吴东旭 刘晓阳 《Journal of Coal Science & Engineering(China)》 2008年第2期311-316,共6页
Underground Electro Magnetic Interference (EMI) has become so serious that there were false alarms in monitoring system,which induced troubles of coal mine safety in production.In order to overcome difficulties caused... Underground Electro Magnetic Interference (EMI) has become so serious that there were false alarms in monitoring system,which induced troubles of coal mine safety in production.In order to overcome difficulties caused by the explosion-proof enclosure of the equipments and the limitation of multiple startup and stop in transient process during EMI measurement,a novel technique was proposed to measure underground EMI distri- bution indirectly and enhance Electromagnetic Campatibility(EMC) of the monitoring sys- tem.The wavelet time-frequency analysis was introduced to underground monitoring sys- tem.Therefore,the sources,the startup time,duration and waveform of EMI could be as- certained correctly based on running records of underground electric equipments.The electrical fast transient/burst (EFT/B) was studied to verify the validity of wavelet analysis. EMI filter was improved in accordance of the EMI distribution gotten from wavelet analysis. Power port immunity was developed obviously.In addition,the method of setting wavelet thresholds was amended based upon conventional thresholds in the wavelet filter design. Therefore the EFT/B of data port was restrained markedly with the wavelet filtering.Coor- dinative effect of EMI power and wavelet filter makes false alarms of monitoring system reduce evidently.It is concluded that wavelet analysis and the improved EMI filter have enhanced the EMC of monitoring system obviously. 展开更多
关键词 wavelet analysis Electromagnetic Campatibility monitoring system EFT/B immunity
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Tuning sol size to optimize organosilica membranes for gas separation 被引量:5
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作者 Huating Song Yibin Wei +2 位作者 Chenying Wang Shuaifei Zhao Hong Qi 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第1期53-59,共7页
A series of organosilica sols are prepared by the polymeric sol–gel method using 1,2-bis(triethoxysilyl)ethane(BTESE)as the precursor.Particle size distributions of the BTESE-derived sols are systematically investiga... A series of organosilica sols are prepared by the polymeric sol–gel method using 1,2-bis(triethoxysilyl)ethane(BTESE)as the precursor.Particle size distributions of the BTESE-derived sols are systematically investigated by carefully adjusting the synthesis parameters(i.e.,water ratios,acid ratios and solvent ratios)in the sol process.In certain conditions,increasing the water ratio or the acid ratio tends to cause larger sol sizes and bimodal particle size distributions.However,higher solvent ratios lead to smaller sol sizes and unimodal particle size distributions.The organosilica membranes prepared from the optimized sols show excellent H_2 permeances(up to 4.2×10^(-7)mol·m^(-2)·s^(-1)·Pa^(-1))and gas permselectitivies(H_2/CO_2 is 9.5,H_2/N_2 is 50 and H_2/CH_4 is 68).This study offers significant insights into the relationship between the sol synthesis parameters,sol sizes and membrane performance. 展开更多
关键词 Organosilica membrane Sol-gelSol synthesis Gas separation
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Experimental study on gas–liquid dispersion and mass transfer in shear-thinning system with coaxial mixer 被引量:1
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作者 Baoqing Liu Yijun Zheng +3 位作者 Ruijia Cheng Zilong Xu Manman Wang Zhijiang Jin 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第9期1785-1791,共7页
The effects of impeller type, stirring power, gas flow rate, and liquid concentration on the gas–liquid mixing in a shear-thinning system with a coaxial mixer were investigated by experiment, and the overall gas hold... The effects of impeller type, stirring power, gas flow rate, and liquid concentration on the gas–liquid mixing in a shear-thinning system with a coaxial mixer were investigated by experiment, and the overall gas holdup, relative power demand, and volumetric mass transfer coefficient under different conditions were compared. The results show that, the increasing stirring power or gas flow rate is beneficial in promoting the overall gas holdup and volumetric mass transfer coefficient, while the increasing system viscosity weakens the mass transfer in a shearing–thinning system. Among the three turbines, the six curved-blade disc turbine(BDT-6) exhibits the best gas pumping capacity; the six 45° pitched-blade disc turbine(PBDT-6) has the highest volumetric mass transfer coefficient at the same unit volume power. 展开更多
关键词 Non-Newtonian fluids Coaxial mixer Gas holdup Relative power demand Mass transfer
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STUDY ON CLASSIFICATION SYSTEM FOR CHINESE COAL
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作者 陈鹏 《Journal of Coal Science & Engineering(China)》 1998年第2期78-84,共7页
An integrated coal classlfication system-technical/commercial and scientific/genetic classiflcation fn China is discussed in this paper. This system shall enable producers, sellers and purchasers to communlcate unambi... An integrated coal classlfication system-technical/commercial and scientific/genetic classiflcation fn China is discussed in this paper. This system shall enable producers, sellers and purchasers to communlcate unambiguously with reqard to the quality of coal complying with the requirements of the respective appllcation. The determination of perfect coal classification system is an important measure for rational utilization of coal resources. 展开更多
关键词 COAL CLASSIFICATION CODIFICATION parameter selection
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New risk assessment methodology for coal mine excavated slopes 被引量:4
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作者 Alison McQuillan Ismet Canbulat +1 位作者 Dan Payne Joung Oh 《International Journal of Mining Science and Technology》 EI CSCD 2018年第4期581-590,共10页
This paper presents a new risk assessment methodology for coal mine excavated slopes. This new empirical-statistical slope.stability assessment m. ethodology (SSAM! is intended for use by geotechnical engineers at bo... This paper presents a new risk assessment methodology for coal mine excavated slopes. This new empirical-statistical slope.stability assessment m. ethodology (SSAM! is intended for use by geotechnical engineers at both the design review and operational stages of a mine's life to categonse the risk of an excavated coal mine slope. A likelihood of failure is determined using a new slope stability classification system for excavated coal mine slopes developed using a database of 119 intact and failed case studies sourced from open cut coal mines in Australia. Consequence of failure is based on slope height and stand-off distance at the toe of the excavated slope. Results are presented in a new risk matrix, with slope risk being divided into low, medium and high categories. The SSAM is put forward as a new risk assess- ment methodology to assess the potential for, and consequence of, excavated coal mine slope failure. Unlike existing classification systems, assumptions about the likely failure mode or mechanism are not required. Instead, the SSAM applies an approach which compares the conditions present within the exca- vated slope face, with the known past performance of slopes with similar geotechnical and geometrical conditions, to estimate the slope's propensity for failure. The SSAM is novel in that it considers the depo- sitional history of strata in an excavated slope and how this sequence affects slope stability. It is further novel in that it does not require explicit measurements of intact rock, rock mass and/or defect strength to rapidly calculate a slope's likelihood of failure and overall risk. Ratings can be determined entirely from visual observations of the excavated slope face. The new SSAM is designed to be used in conjunction with existing slope stability assessment tools. 展开更多
关键词 Risk assessment Slope stability Open cut coal mine Excavated slope Likelihood of failure
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Influence of Negative Pressure Gradient on Pressure Distribution and Gas-Solid Flow Pattern of Solid Feed Systems 被引量:1
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作者 Zhang Meiju Pan Feng +2 位作者 Shao Guoqiang Ge Yu Zhang Lei 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2018年第2期104-110,共7页
A series of experiments on a solid feed system was performed to investigate the effect of negative pressure gradient on the gas-solid flow pattern and hydrodynamic characteristics.Based on the non-fluidized gas-solid ... A series of experiments on a solid feed system was performed to investigate the effect of negative pressure gradient on the gas-solid flow pattern and hydrodynamic characteristics.Based on the non-fluidized gas-solid two phase flow and particulate mechanics in the standpipe,a method for predicting the pressure of the air passing through the recycle chamber and the pressure drop through the loop seal slit in these systems is also presented.The predicted pressure profile along the negative pressure gradient from the proposed model exhibits a good agreement with the experimental data.The experimental data show that the gas flow in the standpipe is always upward in the negative pressure gradients,while the direction ofthe superficial gas velocity through the recycle chamber of the loop seal does not affect the pressure drop in standpipe.It increases with an increasing negative pressure gradient. 展开更多
关键词 fuidized bed solid feedsystem negative pressure gradient gas-solid fow pattern
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Stability study on naturally filling body in gob-side entry retaining 被引量:10
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作者 Zhou Baojing Xu Jinhai +1 位作者 Zhao Maosen Zeng Qinglin 《International Journal of Mining Science and Technology》 SCIE EI 2012年第3期423-427,共5页
In the construction of the filling gob-side entry retaining in a lane, we utilize the self-slide natural phenomenon of a falling gangue in an inclined coal seam goaf. First, we put the falling gangue of goal above the... In the construction of the filling gob-side entry retaining in a lane, we utilize the self-slide natural phenomenon of a falling gangue in an inclined coal seam goaf. First, we put the falling gangue of goal above the laneway and made it the main filling material by adopting the measurement of flexible supporting system combined with those of rigid supporting system. Then we made the filling material gunited and solidified to maintain the filling goal of the gob-side entry retaining beside the lane. Considering the law of energy conservation and law of pressure distribution for retaining the active and Static soil of the wall, we analyzed the reliability of a gangue blocking facilities and the stability of the filling mate- rial in the lane. We analyze the figures to see the stability. The result shows that the gangue block sup- porting system is reliable, and has been successfully practically applied. 展开更多
关键词 Failing gangueNatural-fillingGob-side entry retainingStability
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Reliability Analysis of Production System of Fully-Mechanized Face Based on Output Statistic
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作者 CAI Qing-xiang LI Nai-liang 《Journal of China University of Mining and Technology》 EI 2005年第4期275-278,共4页
Production system of fully-mechanized face is a complicated system composed of human, machine and environment, meantime influenced by various random factors. Analyzing the reliability of system needs plentiful data by... Production system of fully-mechanized face is a complicated system composed of human, machine and environment, meantime influenced by various random factors. Analyzing the reliability of system needs plentiful data by means of system faults statistic. Based on the viewpoint that shift output of fully-mechanized face is the result of various random factors’ synthetical influence, the process of how to analyze its reliability was deduced by using probability theory, symbolic statistics theory and systematic reliability theory combined with the concrete case study in this paper. And it has been proved that this method is feasible and valuable. 展开更多
关键词 OUTPUT ANALYSIS fully-mechanized face RELIABILITY
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A STUDY ON JIG DISTRIBUTION CURVE TRANSFORMATION
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作者 路迈西 常大山 郭珍旭 《Journal of China University of Mining and Technology》 1991年第1期79-87,共9页
An investigation of the errors resulted from distribution curve transformations using six different methods was made on the basis of 61 sets of jig performance test data from the coal preparation plants in China. The ... An investigation of the errors resulted from distribution curve transformations using six different methods was made on the basis of 61 sets of jig performance test data from the coal preparation plants in China. The results indicate that minimum error occurred when distribution curves were transformed by keeping imperfection I constant. Generalized distribution curves are developed for jigs and their applications are discussed. 展开更多
关键词 jigs .distribution curve. generalized distribution curve.
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Industrial-scale Fixed-bed Coal Gasification: Modeling, Simulation and Thermodynamic Analysis 被引量:1
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作者 何畅 冯霄 +2 位作者 Khim Hoong Chu 李安学 刘永健 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第5期522-530,共9页
We have developed a process model to simulate the behavior of an industrial-scale pressurized Lurgi fixed-bed coal gasifier using Aspen Plus and General Algebraic Modeling System(GAMS). Reaction characteristics in the... We have developed a process model to simulate the behavior of an industrial-scale pressurized Lurgi fixed-bed coal gasifier using Aspen Plus and General Algebraic Modeling System(GAMS). Reaction characteristics in the fixed-bed gasifier comprising four sequential reaction zones—drying, pyrolysis, combustion and gasification are respectively modeled. A non-linear programming(NLP) model is developed for the pyrolysis zone to estimate the products composition which includes char, coal gases and distillable liquids. A four-stage model with restricted equilibrium temperature is used to study the thermodynamic equilibrium characteristics and calculate the composition of syngas in the combustion and gasification zones. The thermodynamic analysis shows that the exergetic efficiency of the fixed-bed gasifier is mainly determined by the oxygen/coal ratio. The exergetic efficiency of the process will reach an optimum value of 78.3% when the oxygen/coal and steam/coal mass ratios are 0.14 and 0.80, respectively. 展开更多
关键词 Lurgi gasifier GASIFICATION SYNGAS PYROLYSIS exergetic efficiency
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The study on measures to improve the reliability of the hydraulic systems of shearers
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作者 袁辉 徐龙江 +1 位作者 田大宝 赵燕玲 《Journal of Coal Science & Engineering(China)》 2001年第2期83-86,共4页
The authors indicate that the failure of hydraulic systems of shearers can drop greatly, its’ reliability and service life can be increased by the use of a field oil contamination analyser and filter device to contro... The authors indicate that the failure of hydraulic systems of shearers can drop greatly, its’ reliability and service life can be increased by the use of a field oil contamination analyser and filter device to control the oil contamination of the hydraulic systems of shearers. Experimental provement of silting theory contamination analyser are carried out.The filter effect of portable hydraulic driving oil filter model YLJ 21 is examinationed in laboratory and field experiment. From January to August 1992, on site experimental research using a silting theory contamination analyser and oil filter model YLJ 21 to control the oil contamination was carried out in the Datong Coal Mining Bureau. 展开更多
关键词 SHEARER hydraulic system RELIABILITY
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Tests and error analysis of a self-positioning shearer operating at a manless working face 被引量:16
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作者 FANG Xinqiu ZHAO Junjie HU Yuan 《Mining Science and Technology》 EI CAS 2010年第1期53-58,共6页
Self-positioning of a shearer is the key technology for mining with a man-less working face. In an underground coal mine all radio navigation; satellite positioning or celestial navigation methods have their limitatio... Self-positioning of a shearer is the key technology for mining with a man-less working face. In an underground coal mine all radio navigation; satellite positioning or celestial navigation methods have their limitations. We analyzed an inertial navi-gation system intended to guide the movement a shearer and designed a self-positioning device for the shearer. Simulation tests were also performed on the system. We analyzed the errors observed in these tests to show that the main reason for the low preci-sion of the self-positioning system is accumulated error in the inertial sensor. A Kalman filtering algorithm used in combination with the shearer motion model effectively reduces the measurement errors of the self-positioning system by compensating for gyroscopic drift. Finally, we built an error compensation model to reduce accumulated errors using continuous correction to provide self-positioning of the shearer within a certain range of accuracy. 展开更多
关键词 SHEARER SELF-POSITIONING TESTS error compensation model Kalman Filter
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Discussion on Selection of Pulverizer and Moisture of Pulverized Coal for Lignite Boilers
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作者 Zhang Yun Li Weidong +1 位作者 Xu Chuankai Zhang Jingwu 《Electricity》 2012年第4期25-30,共6页
In China,the abrasion index and the free moisture are regarded as the criteria for determining whether the medium-speed pulverizer or the fan pulverizer could be selected.Based on comprehensive studies on foreign meth... In China,the abrasion index and the free moisture are regarded as the criteria for determining whether the medium-speed pulverizer or the fan pulverizer could be selected.Based on comprehensive studies on foreign methods for choosing the pulverizing system for lignite boilers,it is suggested that the particle size of coal,the drying time,the drying temperature and the humidity should be taken into account when measuring the free moisture of lignite,and the total moisture could also be the principle for type selection of pulverizer for lignite boilers.Furthermore,the determination of pulverized-coal moisture has great influence on the running of pulverizing systems.The actual moisture of certain pulverized coals is compared with that calculated with different methods and a feasible method for determining the moisture of the pulverized coal is suggested. 展开更多
关键词 lignite boiler type selection of pulverizer moisture of pulverized coal
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