hard coal

The energy compensation principle of hard coal crack and Its Applications

硬煤裂隙能量补偿原理与应用

A new kind of technique weakening top hard coal body

一种弱化坚硬顶煤的新技术

Potential of Horizontal Mine Gas Drainage for Underground Hard Coal Mining

水平井在地下硬煤开采中的瓦斯抽采潜力

Injecting Water Technique and Parameters for Hard Coal Bed

较难注水煤层的注水工艺及参数

Study on Super Fuel Rich Flame Combustion of Hard Coal

超浓相火焰燃烧难燃煤探讨

Analysis of the First Caving of Roof Sections in Hard Coal Layers

坚硬煤层顶板段初次放顶分析

The Simulation of the Top Coal Caving property of Hard Coal Seam

坚硬煤层顶煤冒放性相似模拟试验研究

Caving mining under the condition of hard coal and rock

坚硬煤岩条件下放顶煤开采

Hard Coal Mining Water Injection softening Method

双阳煤矿硬煤开采注水软化方法

Selecting Coal Plow by Measuring Cutting Resistance in Hard Coal Seam

测试坚硬煤层截割阻力合理选型刨煤机

Cutting Resistance Test of Hard Coal Seam and its Difficulty Degree of Digging Research

坚硬煤层截割阻力的测试和可刨性研究

Research and Application of Deep-hole Blasting Technology in Fully Mechanized Hard Coal Mining Face

综采工作面坚硬煤体深孔松动爆破技术的研究与应用

The Resource Analysis of High Grade Hard Coal of Xishui County , Guizhou

贵州省习水优质无烟煤资源分析

In general coal can be simply divided into hard coal seam and soft coal seam .

一般可简单地将煤层分为正常煤体结构的硬煤层和构造发育的松软煤层两种类型。

Study of Pre-cracking Hard Coal by Water Infusion in Sub-level Caving Mining

坚硬煤层放顶煤注水弱化研究

One topic of high-performance underground hard coal production gaining increasing importance is that of efficient gas removal .

高效率的井下硬煤生产受到越来越多的重视，其中的一个话题就是瓦斯的有效抽采。

Top Coal Weakening Treatment during Fully Mechanized Caving of Super-Thick Hard Coal Seam

坚硬特厚煤层综放开采过程中顶煤松动弱化处理

Study on Coal rock Caving Laws and Control in Hard Coal and Hard Roof Sub level Caving Fully Mechanized Face

两硬综放面煤岩冒放规律及控制研究

The cracking failure and crack fatigue propagation analysis of WC-Co composite bits in cool cutter used in hard coal

硬质合金截齿刀在使用中的开裂及疲劳行为分析

Study of pre treating the hard coal body with deep hole blasting and dynamic pressure infusing water at fully mechanized face

综采工作面预处理坚硬煤体研究试验

The research on the fractured blocks of the top coal in the longwall top coal caving technique of the hard coal seam ;

对坚硬顶煤预裂中存在的问题，采用在地应力场控制下水力压裂的方法，研究了煤层地应力场控制参数。

Study on Top-Coal Caving and Drawing Capability and Roof Control in Hard Coal and Hard Roof Short Sub-Level Caving Fully Mechanized Face

两硬短工作面综放开采顶煤冒放性及顶板控制技术研究

The adsorbability of hard coal in the pretreatment of water is studied , and some worthy parameters as the reference in engineering are obtained .

本文研究了无烟煤作为纯水制备过程预处理中的吸附剂的性能，测定出工程上有一定参考价值的参数。

The first caving roof sections in hard coal layers can effectively reduce the pressure during the course of caving and guarantee safe production and efficiency .

坚硬煤层顶板分段初次放顶，能够有效缓解放顶期间的顶板压力，保证安全生产，提高生产效率。

F.injection are measured and the experimental studies on the pulverized bituminous and hard coal mixing-injection are made .

根据研究结果，讨论了烟煤混入量对高炉喷吹操作和喷吹效果的影响；

Gelsenkirchen was mentioned in a document for the first time in1147.The discovery of hard coal in mid-1900 triggered the industrialisation of the Gelsenkirchen area .

盖尔森基兴首次被提起是在1147年的文件里，19世纪中在这里发现了丰富的煤矿资源使得这座城市工业化。

The paper held that the two leg shield caving powered support would not be suitable for the top coal caving mining in the hard coal seam and the joint crack undeveloped medium hard seam .

故两柱掩护式放顶煤支架不适用于硬煤层及节理裂隙不发育的中硬煤层放顶煤开采。

For the full-mechanized mining of full height in " two-hard " coal seam , its big mining height and hard coal will cause a serious problem of coal wall caving during shearer coal mining process and often produce large pieces of coal .

对于两硬煤层一次采全高的综采工作面而言，由于采高大，以及煤质坚硬等原因，造成采煤机割煤过程中煤壁片帮严重，频繁产生大块煤炭。

This paper uses the laboratory physical resembles to simulate the top coal caving property of the hard coal seam , puts forward the top coal caving property characteristics of hard coal , and the circumstance of the pressure distributes in front of the working face .

采用实验室物理相似模拟试验对坚硬煤层顶煤冒放性进行了研究，提出了坚硬顶煤的冒放性特征及工作面前方压力分布情况。

Zhu set mine coal and the small sets 11-211-2 coal seam is very similar , are relatively hard coal , gas content and pressure is relatively small , tunnel roof stress under the weight of a large rock , is caused by the accident highlighted the main factors .

朱集煤矿的11-2煤与丁集煤矿的11-2煤层很相似，煤都比较硬，瓦斯含量和压力相对较小，巷道顶板承受的岩体自重地应力大，是引起突出事故的主要因素。