Long wall top coal caving
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Longwall Top Coal Caving (LTCC) is a modified longwall mining method where an additional rear conveyor behind the powered supports draws caved coal from the upper part of thick seams. It was introduced in Australia in 2006 and is used extensively in China. The key difference from traditional longwall mining is this rear conveyor. LTCC allows increased coal recovery from seams over 6m thick that cannot be fully extracted otherwise. It works by cutting the lower seam with the shearer and letting the upper coal cave onto extended canopy shields and be transported away by the rear conveyor as the face advances.
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Highwall Mining.pptx
Overview of Highwall Mining. A small Pictorial Demonstration files. New Technology. Solution to unreachable beded deposit. Highwall mining is a remotely controlled mining method which extracts coal from the base of an exposed highwall. The method has the advantage of low capital cost and less lead time compared with a full underground mine, while being capable of producing in excess of 1 million tonnes per system per year.
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This document discusses high wall mining, which is a remotely operated mining method used to extract coal from thin seams in exposed faces of overburden and coal in surface mines. It involves driving parallel entries into the coal seam from the high wall face without roof support using a continuous miner machine equipped with a cutter head and push beams. The miner can penetrate nearly 300 meters into the coal seam. High wall mining provides an economical way to extract coal reserves locked up in the high wall and can be used when open pit mining limits have been reached or for thin seams where conventional mining is not viable. It has advantages of high coal recovery rates, safety due to lack of manned entry, and low establishment costs.
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This document discusses highwall mining in India. It notes that India is a major coal producer, with most coal coming from opencast projects. Highwall mining allows extraction of thin seams that are otherwise inaccessible due to issues like uneconomical stripping ratios and surface obstructions. A highwall miner is a remotely controlled machine that acts like a miniature continuous miner, cutting coal and transporting it from the highwall face. The document outlines the parts of a highwall miner and advantages like low costs and flexibility. It states that highwall mining is still nascent in India but has potential future prospects at several mine sites. Further developments need to ensure proper design and management of water issues.
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みなさんこんにちはこれ何文字まで入るの？40文字以下不可とか本当に意味わからないけどこれ限界文字数書いてないからマジでやばい文字数いけるんじゃないの？えこ...
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Long wall top coal caving
- 1. LONGWALL TOP COAL CAVING P SHASHIKANTH 16MT001042
- 2. LONGWALL TOP COAL CAVING GENERAL INFORMATION • It is the modified method of longwall mining system • Yancoal introduced the Longwall Top Coal Caving (LTCC) mining technology in Australia at its Austar mine in 2006. • This method has been developed in china in more recent years and is used there quite extensively and successfully. • Cavability is one of the most important parameter that controls the applicability of the LTCC.
- 3. LONGWALL TOP COAL CAVING Major difference between Traditional longwall mining and LTCC The existence of an additional rear conveyor belt behind the powered supports, on which the caved coal from the upper part of the seam is drawn by a moveable flipper attached to the canopy at the rear of the powered supports.
- 4. LONGWALL TOP COAL CAVING
- 5. LONGWALL TOP COAL CAVING The Principle of Longwall Top Coal Caving(LTCC) Special type of longwall of mining Applicable to very thick seams(greater than 6m) where good quality coal is being left because currently conventional longwall equipment cannot operate successfully beyond 6m mining height It uses a longwall set-up and natural forces to aid in winning of coal Increased recovery for only an incremental additional cost
- 6. LONGWALL TOP COAL CAVING
- 7. LONGWALL TOP COAL CAVING The Cutting sequence • The lower section of the seam is cut by the shearer at a set height. • Front Armoured Face Conveyor(AFC) transports the coal out of the face. • The system moves forward to the next cut. • The coal left above the section cut by machine is induced to cave. • The coal falls onto the extended canopies
- 8. LONGWALL TOP COAL CAVING
- 9. LONGWALL TOP COAL CAVING
- 10. LONGWALL TOP COAL CAVING • The sliding rear canopies are sequentially opened then the coal falls through onto the rear mounted Armoured Face Conveyor(AFC). • The sliding rear canopies are opened and closed in a controlled manner to ensure the conveyor is loaded efficiently and to prevent stone being taken out when all the coal has been recovered from a particular section. • Rear Armoured Face Conveyor(AFC) transports coal out of the face. • Then, the rear conveyor is pulled towards the roof supports.
- 11. LONGWALL TOP COAL CAVING • Final cavity will fill with caved stone as the coal is drawn out. • Front Conveyor is pushed forward to the next cut.
- 12. LONGWALL TOP COAL CAVING Another variation of the Top Coal Caving use, where the seam thickness is over 15m. The longwall faces are again developed. The top slice is placed so that there is 5m of coal left above the supports. This top slice(first longwall face) is advanced as an ordinary longwall operation, leaving 5m of coal overhead. The overhead coal is allowed to cave with the roof. The second longwall face is then started off(6- 12months) later at the foot of the seam using the basic Top Coal Caving(TCC) method.
- 13. LONGWALL TOP COAL CAVING
- 14. LONGWALL TOP COAL CAVING ADVANTAGES • High coal recovery. • Operating cost reduction. • High productivity. • Less energy consumption. DISADVANTAGES • The high coal loss occuring during the production of top coal, resulting in a significant decrease of coal recovery.
- 15. THANK YOU