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煤矿超长走向综放工作面远距离智能供液供电技术研究与应用

Research and application of remote intelligent fluid supply and power supply technology in coal mine super-long strike fully mechanized caving face

  • 摘要: 在煤矿长走向工作面工况下,供液供电设备通常采取移动式回撤的方法来跟随工作面的开采,该生产方式具有移动列车设备数量多、不安全、动力电缆及管理混乱、铺设单轨吊或地轨工程量大等缺点,不利于实现煤矿安全生产及减人降耗的长远目标。基于目前综放工作面刮板输送机、乳化液泵站传统驱动及近距离供液供电方式存在的问题,研制大功率远距离输出高压防爆组合变频器和智能型远距离集成供液系统,实现工作面供电供液系统装备的优化配套及远距离供电供液输出已经迫在眉睫。整个项目分为前后部刮板输送机远距离变频驱动项目和智能型泵站集成系统远距离供液项目。前后部刮板输送机远距离变频驱动项目的研究为:新巨龙煤矿2305工作面采用2台BPJV-3×1600/3.3矿用隔爆兼本质安全型高压组合变频器,采用“一拖二”模式用于驱动机头、机尾2台1200 kW电动机,采用变频远距离供电技术实现刮板输送机电机的重载软启动。智能型泵站集成系统远距离供液项目为:采用高压大流量高可靠智能型乳化液泵站、喷雾泵站及自动配液和多级过滤系统的方案形成一个集成供液系统,该系统通过铺设长距离主供液管、主回液管、清水管路,将泵站系统放在距离工作面较远的硐室,形成了向各液压支架用液点供给高压乳化液、喷雾降尘冷却清水以及接收低压回液的一套管路供回液系统。该项目在新巨龙煤矿2305工作面的顺利实施,对国内冲击地压复杂地质条件下的大型煤矿新型工作面远距离供液、供电系统的设计起到了显著的引导和示范作用。该项目成果可显著降低综放工作面安全事故发生率,减少设备检修维护成本、降低设备机械磨损,提高设备使用寿命,提高系统可靠性,保证工作面设备的开机率。同时,能够实现煤矿工作面减人提效、安全生产、节能降耗的目标,对确保综放工作面的安全高产高效具有重要意义。与国内外同类技术比较,在电站拉移方式、供电供液距离、集中控制方式、检修时间、安撤周期等方面均有明显优势,可在同行业采煤工作面广泛推广应用。

     

    Abstract: In the working conditions of long-strike coal mine faces, the traditional approach for liquid supply and power supply equipment is mobile withdrawal to follow the mining progress. However, this production method has several drawbacks. It involves a large number of mobile train equipment, posing safety risks. There are also issues such as chaotic management of power cables, and a large amount of work in laying monorail cranes or ground rails. These disadvantages are not conducive to achieving the long-term goals of safe coal mine production, personnel reduction, and consumption reduction. Considering the problems existing in the traditional drive and short-distance liquid supply and power supply methods of scraper conveyors and emulsion pump stations in fully mechanized caving faces, the development of high-power, long-distance output high-voltage explosion-proof combined frequency converters and intelligent long-distance integrated liquid supply systems to optimize the equipment matching of the working face power supply and liquid supply systems and achieve long-distance power supply and liquid supply output is extremely urgent. The entire project is divided into two parts: the long-distance frequency conversion drive project for the front and rear scraper conveyors and the long-distance liquid supply project for the intelligent pump station integrated system. For the long-distance frequency conversion drive project of the front and rear scraper conveyors, in the 2305 working face of Xin Julong Coal Mine, two sets of BPJV-3×1 600/3.3 mine-used explosion-proof and intrinsically-safe high-voltage combined frequency converters are adopted. The "one-drive-two" mode is employed to drive two 1 200 kW motors at the head and tail of the conveyor. The frequency conversion long-distance power supply technology is utilized to achieve the heavy-load soft start of the scraper conveyor motors. For the long-distance liquid supply project of the intelligent pump station integrated system, a solution integrating high-pressure, large-flow, highly reliable intelligent emulsion pump stations, spray pump stations, automatic liquid-mixing, and multi-stage filtration systems is adopted to form an integrated liquid supply system. By laying long-distance main liquid supply pipes, main liquid return pipes, and clean water pipelines, and placing the pump station system in a chamber far from the working face, a pipeline liquid supply and return system is established to supply high-pressure emulsion, spray dust suppression and cooling clean water to each hydraulic support liquid-using point and receive low-pressure return liquid. The successful implementation of this project in the 2305 working face of Xin Julong Coal Mine has played a significant guiding and exemplary role in the design of long-distance liquid supply and power supply systems for new working faces of large coal mines under complex geological conditions of rock bursts in China. The project results can significantly reduce the incidence of safety accidents in fully mechanized caving faces, cut down equipment maintenance and repair costs, reduce equipment mechanical wear, extend equipment service life, enhance system reliability, and ensure the equipment startup rate in the working face. Meanwhile, it is of great significance for achieving the goals of personnel reduction, efficiency improvement, safe production, energy conservation, and consumption reduction in coal mining faces, and ensuring the safety, high yield, and high efficiency of fully mechanized caving working faces. Compared with similar domestic and foreign technologies, it has obvious advantages in aspects such as power station pulling-moving mode, power supply and liquid supply distance, centralized control mode, maintenance time, installation and removal cycle, etc., and can be widely promoted and applied in coal mining faces of the same industry.

     

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