CHINA SHENHUA ENERGY COMPANY LIMITED On March 8, during the terminal mining phase of the 31117 long-wall mining face at Shendong Coal's Jinjie Coal Mine, two technical challenges were overcome: voltage drop in long-distance liquid and power supply and large-amplitude pipeline vibration, laying the groundwork for the widespread adoption of long-distance liquid and power supply technology in long-wall mining faces.
The 31117 long-wall coal mining face at the Jinjie Coal Mine is the company's first ultra-long-distance remote power and liquid supply working face, spanning a length of 5,052.5 meters. During the initial mining phase, there was an obvious voltage drop after remotely supplying power to the working face, causing problems such as the inability to start the shearer and crusher, and affecting the operation of the frequency conversion equipment during startup. In response, after multiple discussions and trials, the Mine's electromechanical technicians decided to address the voltage loss problem by increasing the voltage output at the mobile substation, and adopting a separate power supply method for the power frequency equipment and frequency conversion equipment. An additional mobile substation was installed at the remote power supply point and a separate power supply method was adopted between power frequency equipment and frequency conversion equipment, preventing excessive voltage drop during power frequency equipment startup that could impact the startup and operation of other frequency conversion equipment. In the meanwhile, a reactive power compensation device was installed on the power-frequency power supply cable of the middle section of the headgate, compensating for the significant voltage drop during startup to ensure the startup voltage of the equipment. To address the issues associated with the excessively long-distance remote liquid supply pipeline, including excessive impact on the pipe wall and large-amplitude pipeline vibration during pressurization, two energy storage devices were installed respectively in the roadway crossing 14 and roadway crossing 64 of the 31117 working face. This has effectively reduced the impact on the pipe wall and minimized vibration along the pipeline during pressurization, ensuring the safe and reliable operation of the long-distance remote liquid supply pipeline.
The deputy mine director in charge of electromechanics emphasized that the installation of power and liquid supply equipment outside the mining area allows complete avoidance of pressure zones during mining activities. A remote power and liquid supply system can continuously serve multiple long-wall working faces, reducing the workload and equipment wear and tear during withdrawal, and creating favorable conditions for future single roadway mining. Boasting profound significance in ensuring safe and efficient production, it is worthy of promotion and application in the industry.
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CSEC - China Shenhua Energy Company Ltd. published this content on 21 March 2024 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 21 March 2024 10:43:14 UTC.
