Sensor-based control in eddy current separation of incinerator bottom ash.
Sensor-based control in eddy current separation of incinerator bottom ash.
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DOI：
10.1016/j.wasman.2013.02.013
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发表时间：
2013-06
期刊：
影响因子：
8.1
通讯作者：
Md Abdur Rahman;M. Bakker
中科院分区：
文献类型：
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作者：
Md Abdur Rahman;M. Bakker
将传感器单元在线放置在涡流分离器 (ECS) 产生的颗粒流中，以研究其在有色金属回收中的功能。目标进料是来自城市垃圾焚烧炉的 1-6 毫米尺寸的部分底灰。传感器单元连接到 ECS 分离器，实时计算金属和矿物颗粒，并准确测量金属产品中流的品位。使用在不同分流器距离收集的传感器数据来检测和研究偏析（例如由于颗粒尺寸或密度）对金属精矿的影响。测试在实验室和底灰加工厂中进行，采用两种不同类型的 ECS 和两种不同水分含量的底灰来源。测量的金属品位与手动分析相符，对于潮湿、干燥和非常潮湿的饲料，误差分别为 0%、1.5% 和 3.1%。对于非常湿的进料，ECS 金属回收率下降，这是从颗粒数量大幅减少和累积颗粒特性的巨大变化观察到的。如果测量的样品是在 ECS 产生的金属颗粒轨迹扇内的代表性位置收集的，则证明其代表整个金属精矿。事实证明，ECS 性能敏感地依赖于分流器距离，因为 10 毫米的偏移可能会导致金属回收率发生 10% 的变化以及品位发生 18% 的变化。传感器单元的主要功能是在线质量控制和促进ECS分离器距离的自动控制。这些功能转化为 ECS 金属回收的显着改进，进而带来经济效益、提高废金属回收率以及进一步减少焚烧炉底灰的生态弊端。
A sensor unit was placed online in the particle stream produced by an eddy current separator (ECS) to investigate its functionality in non-ferrous metals recovery. The targeted feed was the 1–6mm size fraction bottom ash from a municipal waste incinerator. The sensor unit was attached to the ECS splitter, where it counted in real-time metal and mineral particles and accurately measured the grade of the stream in the metals product. Influence of segregation (e.g. due to particle size or density) on the metals concentrate were detected and studied using the sensor data collected at different splitter distances. Tests were performed in the laboratory and in a bottom ash processing plant with two different types of ECS and two sources of bottom ash with different moisture content. The measured metal grades matched the manual analyses with errors 0%, 1.5% and 3.1% for moist, dry and very wet feed, respectively. For very wet feed the ECS metals recovery dropped, which was observed from the strongly reduced particle counts and the large changes in cumulative particle properties. The measured sample proved representative for the whole metals concentrate if it is collected at a representative position within the metals particle trajectory fan produced by the ECS. ECS-performance proved sensitively dependent on splitter distance, since a 10mm shift may result in 10% change in metal recovery and 18% change in grade. The main functionalities of the sensor unit are determined as online quality control and facilitation of automatic control over the ECS splitter distance. These functionalities translate in significant improvements in ECS metals recovery which in turn is linked to economic benefits, increased recycling rate of scrap metals and a further reduction of the ecological drawbacks of incinerator bottom ash.