coal mining technlogy brief_low coal seam_hot mining

Beijing HOT Mining Tech Co.,Ltd

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Coal Mining Technlogy Brief

- Low Coal Seam

Contact: [email protected]


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Why HOT Know How?

-How to develop Low-Seam Underground Coal Mining.

The Reserve of Resources and Disaster in Southwest China

The Reserve of Resources The low-seam and extra low-seam whose thickness under 1.3m take 60% of the total. (among

which , extra low-seam whose thickness under 0.8m takes 30%.) The medium-thickness coal seam

under 1.3～3.5m takes 39%,(mostly under 2.0m) and for these whose thickness above 3.5m takes

10%.

The flat seam and gently inclined seam take 55%, and the inclined low seam and Steeply inclined

low seam take 45% (among which, the seam with the inclination of 35. - 70. takes 30% of the total) .

Fault , Fallen-columns , Fold , Joint ,Fracture Development， Complicated Coal Seam Structure,

Thickness Changes，Roof and Floor Lack Stability.


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The Disaster Situation

There’re various disaster factors such as water, fire, gas, coal dust, hydrogen sulfide and

roof existing in all the mines of Sichuan Coal Industry Group Limited Liability Company to

varying degree . The disasters gets severe and serious with the increase of the mining

depth.

Coal seam gas-bearing capacity is 10-25 m3/t, maximum coal seam gas pressure is

4.85MPa.

They are all the coal seam with low gas permeability and hard to exploit.

- Coal gas outburst and large amount of mines with high gas.

- Ten couples of mines with high possibility of coal seam spontaneous combustion.

- 23 couples of mines with high possibility of gas and dust explosion.


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Major Technical Advantage of HOT Mining

1.Mechanized Mining Technology

The Steeply Inclined Seams and Edge Seams Integrated Mining

Technology

The low seam and Extra low seam Integrated Mining

Technology


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The Steeply Inclined Seams and Edge Seams Integrated Mining

Technology

（1） Integrated Mining Technology

Developed with our domestic partners, HOT-mining firstly realized the integrated and

mechanized mining technology for the edge seams（35-55°）. For the Lvshuidong

Coal Mine, we solved the technical problems of skid resistance and safety protection of

the Coal Cutter, Conveyor, Hydraulic Support.


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The efficiency improvement of Lvshuidong Coal Mine after taking the integrated mining technology.

The annual output increased by 469% and recovery of resources increased by

more than 1 times which reached the international leading level.

By continuous research and study for years, HOT

Mining achieved:

The edge seams mining have been improved from about 30°to 60°；

Our technology has been applied in Sichuan, Chongqing, Guizhou, Yunnan,

Hunan and other large provinces and cities with a total number of more

than 20.


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（2） Steeply Inclined Seams Pseudo-pitch Puppet Downward Integrated Mining Technology

To solve the technical difficulty of seam inclination over 60 ° and these under 60°but with soft

and sloughing- prone seam, Hot-mining among with other domestic expert partners developed the

steeply inclined seams pseudo-pitch puppet downward integrated mining technology and

complete set of equipment.

This technology was first tested and applied in Liziya South Coal Mine which is a coal and gas

outburst mine.

The tested working face oblique 58 meters long. Its average thickness of coal was 1.93m, and its

average dip angle was 62°(some was 70°). During the testing period, the average monthly

production was around 21,000 tons. No serious injury or other accident was reported and the

safety condition was very good.


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（3）Full Mechanized Mining-Sublevel Caving Mining Technology Applied in Thick Coal Seam

Case: FMM-Sublevel Caving Mining Tech was adopted by Sichuan Coal Group Panmei

Company in Dabaoding Coal Mine, and achieved 100,000 ton output monthly on the

working face with 4.7m coal thickness and 45°inclination angle.

（4）The Thick Seam Mining with Large Dip Angle Integrated One-pass Mining Technology

The test was started from June 2013, in Huashan Coal Mine 4238 working face and achieved

great success.

The testing production working face’s total thickness was 4.5-5.5m，and the dip angle was38

°-45°

The Yield level reached 70,000 tons. And the recovery of resources was improved. It also

enriched the diversity of our mining technology as well.


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2.The low seam and Extra low seam Integrated Mining

Technology

（1）0.8-1.3m Low Seam Integrated Mining Technology

Feature： Independent research and development of low seam cantilever

Shearer , low machine surface height （570）, Coal is too high altitude

（300）, High installed power （421KW）， Cutting power up to 2 *

150KW, Coal loading effect（more than 90%）, strong adaptability of fault,

seam thickness and other geological conditions, to achieve a thin coal

seam face from the open gap, bidirectional cutting coal.


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Three Engine Ground Test Site Working Face Production Site

Achieve 0.8-1.3 m thin coal seam double-drum shearer comprehensive mechanized and

efficient mining. At an average thickness of 0.85 meters of coal mine plums Pass layered

face, monthly production of 30,000 tons. To achieve a layered approximately 10.4 million

tons of coal resources under hard use plums Pass mining, and prolong the service life of

mine for about nine years.


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（2）Low Seam Mining

Developed bottom climbing electric traction shearer ，for the first time achieved a

minimum limit of low seam mining height 0.55m mechanized mining.

Artisanal Mining The Comprehensive Mechanized Mining

The application of the technology, coal face yields 1.8 times, mining efficiency

increased by 3.38 times, tons of coal production cost was reduced by 63%.


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Technology Governance Disaster Technology

（1）Gas and Fire Prevention Technology

Thin and very thin coal seam mechanized mining technologies, boosting mining protective layer,

realize the coal (rock) and gas simultaneous extraction.

Carry out pre-splitting blast, slotting, hydraulic fracturing technology research to improve the low

permeability coal seam gas extraction efficiency.

Carry out along the empty roadway protection technology research, implementation of the "Y" type

ventilation, governance Face Gas gauge.

Low permeability coal seams gas comprehensive control technology, early prediction of

coal seam spontaneous combustion technology in the domestic leading level.


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（2）Waterproof Technology

Across the country, HOT takes the lead in developing south karst mine

waterproof technology research.

Build complex hydrogeological conditions of mine “Have dug will explore” of

“Four in One”（ Monitoring and forecasting, combined with anti-exploration,

test management, comprehensive protection ） Waterproof Technology

Security System .

Through technological disaster governance, improved security degree,

maximize the effectiveness of mechanized equipment,and create the conditions

to achieve high yield and efficiency 。


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MG300(250)/722(622）

HOT Ac Traction Shearer

Independently Developed of Steeply Inclined Shearer and

Low Seam Shearer

MG150/421

HOT Climb Floor Outer Traction Shearer

MG2×100/495

HOT Ac Traction Shearer


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Independently developed for different mining conditions of burial and big dip face outfit (bracket,

shearer, conveyor, dual horizontal end bracket), and achieved 16 patents.

Frame Between Block

and Gangue Device

Before the

Gangue Device

Auto-balancing

Device

Scalable Connection

Device

Hydraulic

Support

Shearer

Scraper

Conveyer

Fault Force

Braking

Integrally Cast

Pin Line Trap Device

Lateral Push

Unit


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Working Face Ended Support

Horizontal Lower End Hydraulic Support

Variable

Angle

Retractable

Roof Beams

Coal

Channel

Walkways

Transversal Arrangement Pedestrians and Coal Separation

Noninterfering with the Loader Overall Mobile Whole Sealing The third generation of the Lower End Hydraulic

Support Site Layout


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Steeply Inclined Series Hydraulic support

Large Dip Angle Large Mining Height Hydraulic Shield Support


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Mine Design

HOT can help you to maximize ore reserve value basis on our operating expertise.

We have years of underground mine engineering and operating experience and across

multiple commodities using all common mining methods.

Especially, we have many successful design and operation experiences for underground

coal mines those are thin coal seam, large dip angle, as well as many faultags. And most

of these coal mines (thin coal seam) are designed and operated by longwall mining

method (fully mechanized mining). The thin coal seam longwall method helps to satisfy

the highest safety standard and more margins.

• Large dip angle, thin coal seam longwall（dip angle range: 35°-55°）

• Thin coal seam, very thin coal seam longwall（Thinnest seam range: 0.8m ~ 1.3m）


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Our Engineering Partner and Detail Drawing Supplier, Design and Research Institute of

Sichuan Coal, which is a State-Owned Engineering Company and also focuses on thin

coal seam mining and surface mining.

Currently there are 181 engineers, including 56 senior engineers (including 7 professor

senior engineers), intermediate title 60, primary title 55. Covering geology, mining, mine

construction, ventilation, electrical, communication signals, automation and industrial

control, mechanical, electrical, coal washing, utilization, building, construction,

environmental protection, HVAC, plumbing, general layout and transportation, roads,

technical and economic and more than 20 majors. Has completed more than 1,000 types

of mining design, engineering consulting, completed more than 600 feasibility studies,

master planning, project proposals and tenements settings and other projects, but also

provide the technological transformation of state-owned key coal mines and small coal

mines, vision and chemical aspects of mining, construction and engineering, building

anti-shock technology consulting services.


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CNC Cutting Machine


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Beveling Robot


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Through Type Shot

Blasting Machine


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Large CNC Positioner


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Assembly Platform


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Welding Preheating Furnace Welding Aging Furnace


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Axial parts Heat

Treatment Furnace


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Double-sided

Boring Machine


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CNC Machine Tools


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The Welding Robot

Work Group


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Welding Robot Station


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Hydraulic Support

Test Rig


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HOT Mining independently

developed the tester for 2500

tons of crushing, which can

take 0.65 ~ 7.0 meters of all

kinds of hydraulic support

crushing test.

Support Pressure Test


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The Busy

After-sales Team

THANK YOU 谢谢

coal mining technlogy brief_low coal seam_hot mining

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