Ahead of the Mechanised Coal Mining article in International Mining’s September issue comes news that Russia’s Yalevskogo mine operated by the Siberian Coal Energy Co (SUEK) recently surpassed the world record for monthly coal production from a single longwall system. The mine produced 1,567,000 t of raw coal in July 2017. The mine, formerly known as Kotinskaya, surpassed its own national record and challenged the world record by mining 1,407,300 t in the month of May.
Last year SUEK ordered Cat® longwall equipment for a face extension from 300 to 410 m. The extended longwall started operating in April 2017, and it quickly established new production records in the 3.8-m-thick seam—without any lost time injuries on the face and with full compliance to national safety laws. In 2016 Yalevskogo mine produced more than 4.5 Mt of steam coal, and production is expected to increase significantly this year.
SUEK combined Cat roof supports from other longwall faces to extend the face the additional 110 m. Three different types of Cat roof supports were integrated into the system. To match the face conveyor to the different roof support types, Caterpillar manufactured custom clevis mountings (connection between AFC pan and roof support base) to ensure that all face roof supports have the same tip-to-face distance of less than 412 mm, according to Russian regulations. The tip-to-face distance is critical to maximize roof integrity and limit dilution.
The two-leg Cat roof supports each have a width of 1.75 m and support capacity of 725 t. The hydraulic legs are specially plated to resist the corrosive environment of the mine.
The longwall system includes a Cat AFCPF6 armoured face conveyor (pan width 1,142 mm) as well as a Cat BSLPF6 beam stage loader—both driven through Cat CST drives, featuring no-load motor startup, AFC soft start, synchronized heavy load startup, and accurate load sharing between as many as three drive motors. For the face extension, the installed power of the face conveyor was upgraded to 3 x 1,000 kW. The beam stage loader includes a SK114 crusher with 400 kW installed power. Pan width is 1,342 mm.
The longwall is fully automated with Cat face automation including Cat programmable mining controls and condition monitoring software, facilitating full automation, monitoring and remote diagnostics for all face equipment. All information can be transferred to the surface in real time to support optimizing longwall performance.
Additionally, the electrohydraulic roof support control system for the Yalevskogo mine offers special operating modes to boost both productivity and safety. The system can reactivate some regions of the face and resume production even though the face has been put into a safe mode in response to detection of an electrical fault, sometimes caused by a broken cable between two PMC-R controls. Before reactivation, strictly defined conditions must be observed.
Cat equipment for a second face at Yalevskogo is described in the September article.