Carbon removal from coal combustion fly-ash by tribo-electrification in vibro-fluidized beds

从燃煤烟气中捕获的飞灰通常在填埋场中处理，产生环境问题。然而，飞灰可以潜在地用作水泥生产的原料作为添加剂，如果捕获的细碳颗粒可以以经济的方式有效地去除。本研究旨在探讨利用摩擦起电萃取燃烧飞灰中碳粒的可行性。在小型摩擦电流化床装置上进行试验，研究了运行参数如含水率、含碳量、流化速度、振动频率和振幅对燃煤电厂飞灰粉摩擦荷电以及荷电后的混合物通过调节电场分离灰和碳颗粒的影响。 特别地，使用由Sonic Technology Solutions Inc.将被执行以评估在流化床中的颗粒电荷密度积聚和分离装置中的电场强度的不同组合下的分离效率。这是支持公司在扩展其声波研磨技术以实现从飞灰中高效去除碳颗粒方面的综合努力的一部分。

Flyash captured from coal combustion flue gases is usually disposed in landfill, creating environmental problems. However, flyash can be potentially used as additives as a feedstock for cement production if the trapped fine carbon particles can be effectively removed in an economical way. The proposed work is to study the feasibility of extracting carbon particles trapped in the combustion flyash by tribo-electrification. Tests will be conducted in a bench scale tribo-electrical fluidized bed unit to investigate the effect of operating parameters, such as the moisture content, carbon content, fluidization velocity and vibration frequency and amplitude on the tribo-charging of flyash powders from coal combustion power plant, and the subsequent separation of charged ash and carbon particles by passing the mixture through a regulated electrical field. In particular, tests using flyash sampled of different properties to be provided by Sonic Technology Solutions Inc. will be performed to evaluate the separation efficiency at different combinations of the particle charge density buildup in the fluidized bed and the electrical field intensity in the separation device. This is part of an integrated effort from the supporting company in extending their sonic grinding technology to achieve high efficiency removal of carbon particles from flyash.