浅析曲斗矿不稳定煤层采掘布置方法

针对曲斗井田范围内煤层地质构造复杂。赋存不稳定的实际情况，经过长期的生产实践，总结介绍适用南方矿井各种不稳定煤层形态的开拓开采方法，以求得尽可能经济、合理、安全开采。     

浅析地面瞬变电磁法对陷落柱的探测应用

煤矿井田内岩溶陷落柱是制约煤矿安全开采的瓶颈,采掘工作面常因陷落柱作为含水层的天然导水通道而引发突水事故.为了避免岩溶陷落柱影响采掘工作面安全生产,查清陷落柱的导水性是非常有必要的.大阳煤矿经三维地震勘探发现,3307备采工作面发育2个陷落柱XT9(长轴54 m,短轴45 m),XT2(长轴270 m,短轴94 m),...     

煤矿井下过陷落柱支护方案的优化研究

针对巷道过陷落柱时支护效率低下、围岩稳定性差的不足,提出了一种新的煤矿井下过陷落柱支护方案,以超前注浆和锚网索联合支护为核心,实现了对过陷落柱巷道的可靠支护,既确保了巷道的支护稳定性,又提升了井下支护效率和安全性.实际应用表明,新的过陷落柱支护方案能够将巷道顶板的最大变形量降低71.7％,将巷道两帮的最大变形量降低73...     

王庄煤业3802综采工作面过陷落柱安全技术应用

王庄煤矿3802综采工作面内陷落柱会影响工作面的安全开采.为了保障工作面顺利通过该地质构造,结合3802综采工作面地质背景,经研究,探讨采用采煤机直接切割与人工打眼放炮相结合的方案,并制定了相对应的安全技术措施,保障了过陷落柱期间人员作业安全和生产安全.     

综合物探技术在探测煤矿陷落柱中的应用

阐述了陷落柱现象产生的物理性特征,分析了物探技术在煤矿陷落柱探测中的具体应用状况,展望了物探技术发展方向趋势,以此为煤矿生产良好发展提供助力.     

大采高工作面过陷落柱技术研究

针对传统大采高工作面过陷落柱技术工作面下沉量大的问题,开展大采高工作面过陷落柱技术研究,通过封堵钻孔布置及注浆、过陷落柱支护,实现对大采高工作面的加固.实验证明,新的施工技术与传统施工技术相比,可有效减少大采高工作面的下沉量,为大采高工作面施工提供安全、稳定的条件.     

综采工作面过陷落柱安全技术措施分析

为了保证8102工作面安全快速过X7陷落柱,防止过陷落柱期间陷落柱围岩煤体出现破碎、片帮、瓦斯超限等情况,提高液压支架的支护强度,决定在过陷落柱期间采用注浆加固技术,并提出了合理、有效的安全施工措施。经过实际应用发现,采取安全技术措施后,工作面过陷落柱回采速度提高至6.4 m/d,提高了陷落柱顶板的稳定性,取得了显著的应用成效。     

207运输顺槽过陷落柱技术应用分析

207运输顺槽在掘进过程中遇到一个较大的陷落柱。为了保证掘进的安全进行,需要采用合适的方式过陷落柱。根据实际情况,制定了绕巷过陷落柱的施工方案。重点介绍了在过陷落柱时采用的支护方式,包括临时支护方式和永久支护方式。按照设计方案,在一个月的时间安全通过了陷落柱。希望所述内容可以为煤矿巷道掘进过陷落柱提供一定的参考和借鉴。     

作业面过陷落柱顶板控制分析

陷落柱作为威胁矿井回采安全的一种特殊地质构造形式,确保回采通过陷落柱期间的安全,对矿井长久发展意义重大。以此为着手点,针对作业面过陷落柱顶板控制开展全面分析,结合具体工程实际,在分析回采过陷落柱存在问题的基础上,对作业面过陷落柱顶板控制技术开展探究,并阐述其应用效果,希望能够为其他矿井相似工程的开展提供借鉴和参考。     

槽波地震勘探技术在3405回采工作面的应用

3405回采工作面形成后,根据两顺槽实测高程、断层和坑透的异常区预测分析该工作面内隐伏的陷落柱和断层较为发育,构造将会成为影响回采和安全生产的关键问题.以该工作面为研究对象,应用槽波地震勘探技术探测工作面内的断层、陷落柱分布,为工作面的安全生产提供了保障.     

发动机燃用煤层气的燃烧性能研究

为了分析发动机燃用煤层气时的燃烧特性,本研究在现有的单缸柴油机上加装点火系统和燃料喷射系统,将其改装成为适合燃用低热值气体的电控气体燃料发动机。采用台架试验研究与模拟分析相结合的研究方法,按照真实的煤层气的成分和各成分体积比例,配制出煤层气,并对发动机燃用不同组分的煤层气的性能进行了试验研究,对其燃烧特性进行了分析和总结。     

Spouted and spout-fluid bed combustors 1: Devolatilization and combustion of coal volatiles

The devolatilization and volatile combustion of a single coal particle in spouted and spout-fluid beds have been studied. The results showed that the flame extinction time increases with the particle diameter, and decreases with the bed temperature. When the bed temperature and the air flow rate were fixed, the operation modes (spouted or spout-fluid bed) showed less effect on the mean flame extinction time. A mathematical model of the spouted bed mode for preignition and postignition periods has also been developed assuming the devolatilization rate to be controlled by heat transfer and multireaction pyrolysis kinetics based on volatile products. Ignition, heat transfer back from the volatile flame to the particle surface, variation in flame temperature, and the hydrodynamics of SB are taken into account. The model predictions, with some adjusting parameters, were in good agreement with experimental results.     

Some considerations of start up in the design of fluidized bed boilers

An auxiliary start-up system is required in fluidized bed combustors in order to heat the bed to a temperature at which coal fed to the bed will ignite and burn without producing excessive smoke. Four methods are used by the U.K. National Coal Board, the one selected for a particular application being dependent on the type of solid fuel used and the type of appliance. To illustrate the nature of the design calculations associated with start-up, the paper describes the principles of a mathematical model developed to determine the rating of burner required for the hot gas start-up approach.     

循环流化床锅炉在我国的现状和发展

可以燃用高硫、低灰熔点、低挥发分的低质煤的循环流化床锅炉，本文介绍其在我国应用的现状、存在问题、改进措施和展望。     

Experimental study on syngas production by co-gasification of coal and biomass in a fluidized bed

The main results of an experimental work on co-gasification of a Chinese bituminous coal and two types of biomass in a bench-scale fluidized bed are reported in the present study. Experiments were performed at different oxygen equivalence ratio, steam/carbon ratio and biomass/coal ratio. In addition, stabilization of co-gasification process was investigated. It was found that a relatively low oxygen equivalence ratio favors the increase of syngas yield (CO + H₂). There is a maximum value in the curve of syngas yield versus steam/carbon ratio. Moreover, the content of H₂ in gas increases with the increase of biomass ratio while that of CO and syngas yield decrease. A continuous stable operation can be gained.     

流化床中高水分煤的燃烧与排放试验研究

通过在一小型流化床中进行高水分煤的燃烧与排放的试验研究，表明水分含量和空气－燃料比对于高水分煤的燃烧与排放有较大影响。随着水分增加，流化床床温下降，ＮＯｘ、ＳＯｘ排放量也下降。空气－燃料比存在一最佳值，这时床温最高，而偏离此值，床温下降，随着空气量的增加，ＮＯｘ、ＳＯｘ排放量也增加。当空气－燃料比变化时，燃烧干煤与燃烧高水分煤有着类似的试验结果。     

煤调湿技术分析与研究

煤调湿技术是一种焦化行业节能减排技术.文中分析和研究两种煤调试技术,一种是利用干熄焦蒸汽发电后的低压蒸汽作为热源的蒸汽管回转干燥法煤调湿技术;另一种是利用焦炉尾气为热源的流化床煤调湿技术.并采用宝钢实际运行数据和马钢实际运行数据对两种技术进行了对比.     

Gasification of preheated coal: Experiment and thermodynamic equilibrium calculation

A new process integrating a circulating fluidized bed (CFB) reactor and an entrained bed reactor was proposed for gasification of preheated coal. The CFB reactor as a preheater was successfully used in clean coal combustion. In this study, gasification of preheated coal was tested in a bench-scale test rig, which consisted of a CFB preheater and a down flow bed (DFB) gasifier. The effects of operating parameters of the preheater and gasifier were revealed via thermodynamic equilibrium calculations. A stable preheating process was obtained in the CFB preheater at the O₂/C molar ratio of 0.31 and higher gasification reactivity was gained in preheated char owing to the improvement in intrinsic reactivity, specific surface area and total pore volume. Effective gasification of preheated char was achieved in the DFB gasifier at 1100 °C and the total O₂/C molar ratio of 0.67, meanwhile the CO + H₂ yield and carbon conversion increased. Thermodynamic equilibrium calculations revealed when the gasification reaction rates varied little above 1100 °C and the same carbon conversion was achieve in gasifier, lowering the temperature would lead to an increase in cold gas efficiency and a decrease in O₂ demand.