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配煤对煤灰熔融特性的影响
以高灰熔点府谷煤(A)分别与低灰熔点神木西沟煤(B)和神木河畔煤(C)按不同比例配比,用智能一体化马弗炉制成灰,用JRHR-3型微机灰熔点测定仪测定其在弱还原性气氛下的熔融特征温度,并利用XRD与CaO-SiO2-Al2O3三元相图分析配煤灰样在不同温度和不同配比下矿物组成的变化.结果表明,配煤可以有效改善煤灰熔融特性,配煤的灰熔点和煤的配比呈非线性关系;配煤的灰熔点变化主要是由于高温下矿物质的转化....
2020-09-15 12:28:59浏览：49
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长焰煤配煤炼焦的研究
在对神府长焰煤基础性质研究的基础上，基于现有配煤方案，通过添加神府长焰煤替代部分1/3焦煤和气煤进行配煤炼焦试验，结果表明，在增加肥煤配比时可以用长焰煤替代部分1/3焦煤和气煤，有利于降低焦炭的硫分和灰分，扩大炼焦煤资源，降低配煤成本。...
2020-09-15 12:28:59浏览：94
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利用煤的形成过程提质褐煤
褐煤的高水分量几乎影响褐煤利用的每一方面。为了实现褐煤资源的高效利用,本文中利用煤的形成过程设计了一套褐煤提质工艺,主要是模拟一个高压、高温的环境加速褐煤转变。工艺中要求合适的压力和温度,可以明显提高脱水率。...
2020-09-15 12:28:59浏览：51
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配煤在煤化工中的应用
配煤技术在满足技术可行性的同时还可实现经济效益和环境效益的最大化，保证用煤设备的高效、安全运行。本文对配煤的作用进行了分析，研究了配煤在锅炉用煤中应用情况，并且以鲁奇气化炉为例，分析了不同煤种的运行情况，为调整工况和均匀布气，需要结合具体的负荷合理搭配使用不同种类的煤种。同时提出了保障气化炉经济运行的措施。...
2020-09-15 12:28:59浏览：65
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Moving Behavior of an Object in Gas-Solid Fluidized Beds
The settling behavior of coarse particles in a gas-solid fluidized bed was experimentally studied by using magnetic tracer. It is well known that the calculation of terminal velocity is of interest in dense medium separation.However, this problem has not been completely solved up to now. In this work, the terminal velocity of an object moving in a gas-solid fluidized bed was experimentally measured and theoretically calculated. The experimental results in dicated that the plastic viscosity and yield stress of the bed increase as the size of fluidized particles increases, but it varies little when some coarser particles are mixed with the fluidized particles. The resistance to a rising object was an order magnitude greater than that to a settling object. The efficient buoyancy on a flaky object, which lies flatly on the gas distributor, was much less than that calculated by the Archimedes' principle. The object does not always rise or set tle with minimal projective area owing to radial motion of the fluidized particles. But in the lower part of the bed, the bar-shaped objects were likely with minimal projective area rising or settling....
2020-09-15 12:28:59浏览：68
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Advances in gas content based on outburst control technology in Huainan, China
The sudden and violent nature of coal and gas outbursts continues to pose a serious threat to coal mine safety in China. One of the key issues is to predict the occurrence of outbursts. Current methods that are used for predicting the outbursts in China are considered to be inadequate, inappropriate or impractical in some seam conditions. In recent years, Huainan Mining Industry Group (Huainan) in China and the Commonwealth Scientific and Industrial Research Organisation (CSIRO) in Australia have been jointly developing technology based on gas content in coal seams to predict the occurrence of outbursts in Hua-inan. Significant progresses in the technology development have been made, including the development of a more rapid and accurate system in determining gas content in coal seams, the invention of a sam-pling-while-drilling unit for fast and pointed coal sampling, and the coupling of DEM and LBM codes for advanced numerical simulation of outburst initiation and propagation. These advances are described in this paper....
2020-09-15 12:28:59浏览：74
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Research on Geological Structure Mark of Coal and Gas Outbursts in Pingdingshan Mining Area
Based on the study of regional displaying rules of coal and gas outburst controlled by geological structure in Pingdingshan mining area, the geological structure features in outburst sites were investigated emphatically. The combination type, orientation and least seam thickness in outburst sites were put forward. This research provides a geological mark for forecasting gas outbursts in deep mining....
2020-09-13 23:35:02浏览：57
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Thermal simulation of the formation and evolution of coalbed gas
Thermal simulation experiment of gas generation from the peat and the coals were performed using the high temperature and pressure apparatus, at temperature ranging from 336.8-600℃, a pressure of 50MPa and two heating rates of 20℃/h and 2℃/h, and the evolution and formation of coalbed gas components were studied. Results show that for the coals, the gaseous products are mainly composed of hydrocarbon gases. However, for the peat the content of hydrocarbon gases in gaseous products is lower than that of non-hydrocarbon components. In the generated hydrocarbon gases methane is predominant and heavy hydrocarbon gases (C2-5) are present in small amount.Meanwhile, carbon dioxide (CO2) predominates the generated non-hydrocarbon gases, and hydrogen (H2) and sulfurated hydrogen (H2S) are existent in trace amount. It is also observed that temperature is the main factor controlling the evolution of coalbed gas generation. With increasing vitrinite reflectance, methane rapidly increases, CO2 sightly increases, and C2-5 hydrocarbons first increase and then decrease. The peat and Shanxi formation coal have a higher generative potential of coalbed gases than coals and Taiyuan formation coal, respectively, reflecting the effect of the property of organic matter on the characteristics of coalbed gas component generation. In this study, it is found that low heating rate is favorable for the generation of methane, H2and CO2, and the decomposition of C2-5 hydrocarbons. This shows that heating time plays an important controlling role in the generation and evolution of coalbed gases. The results obtained from the simulation experiment in the study of coalbed gases in natural system are also discussed....
2020-09-13 23:35:02浏览：56
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煤与糠醛渣混燃的热重分析及基于分布活化能模型的动力学研究
通过热重技术研究煤与糠醛渣混燃的燃烧动力学,采用分布活化能模型(DAEM)进行了动力学分析,比较纯煤、纯糠醛渣及两者在3种不同掺混比例、不同升温速率下燃烧反应的差异.结果表明:糠醛渣能够促进煤的燃烧,随着糠醛渣加入量增大,试样着火温度下降,燃烧性能改善;糠醛渣掺混比例增大,燃烧反应的活化能呈下降趋势....
2020-09-02 20:01:33浏览：138
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基于热重分析法的烟煤掺烧褐煤特性研究
针对电厂掺烧褐煤缺乏相关理论指导的技术需求，采用热重分析方法系统考察了包煤、准煤和褐煤的单独燃烧特性，并将两种烟煤分别以10％、30％、50％和70％的比例在相同条件下与褐煤混合燃烧，根据各燃料燃烧特征参数计算了单一煤种及其不同掺混比例的着火指数、燃尽指数和综合燃烧指数。结果表明，褐煤最易着火和燃尽；包煤着火特性较好，但在550～660℃范围内出现难燃峰致使燃尽特性变差；准煤的着火特性最差，燃尽特性略优于包煤；将包煤和准煤与褐煤掺混后燃烧特性有所改善，各燃烧特征温度降低，且综合燃烧指数随褐煤掺烧比例的增加而增加。建议在电厂实际应用时，褐煤的掺烧比例控制在30％－50％之间。...
2020-09-02 20:01:33浏览：90
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基于热重-红外-质谱联用技术定量分析燃煤气体产物
为了准确定量表征燃煤过程中的多组分混合气体产物,以在氮气气氛中神华混煤热解过程为例,采用热重-红外-质谱联用技术,结合脉冲热分析法,研究煤热解多组分气体产物的逸出特性,重点讨论载气流量、炉温、红外光谱检测分辨率及扫描次数等参数对气体定量测量的影响,分别建立红外光谱以及质谱定量标定工作曲线,确定CO2和CH4的平均析出量.结果表明,神华混煤热解主要生成CO2,CH4,H2,CO,H2O以及含C-H、C-O、C=O等官能团的气体;红外光谱标定信号主要受载气流量和分辨率的影响;红外光谱和质谱定量结果存在差异;神华混煤热解过程中每毫克煤样析出CO2和CH4的平均量分别为65.9和24.1 μg....
2020-08-31 10:42:30浏览：68
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石莼与褐煤低温共热解热重分析及动力学
将不等量的生物质石莼(SC)加入到褐煤(AL)中进行低温干馏实验,实验表明:随石莼的掺混比增加,热解油产率呈先增加后减少的趋势,在石莼掺混比为30%时热解油产率达到最大值12.50%,热解油中烷烃含量在原有基础上增加了23.54%,在一定程度上提高了热解油品质.利用热重分析仪对石莼、褐煤单独热解及30%最佳掺混比的混合样共热解的热解特性进行了研究,结果表明:石莼的加入使褐煤初始热解温度提前,失重速率变快,在 300~700℃之间,实验所得混合样的残重量小于单独热解残重量的理论加权值,表明石莼的添加一定程度上促进了热解反应的进行.混合热解符合一级动力学方程模型,指前因子A和活化能Ea存在补偿效应,共热解时的A和Ea与褐煤单独热解相比均减小....
2020-08-31 10:42:30浏览：54
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