CHARGING OF PARTICULATES IN THE CORONA FIELD OF ROLL-TYPE ELECTROSEPARATORS
CHARGING OF PARTICULATES IN THE CORONA FIELD OF ROLL-TYPE ELECTROSEPARATORS
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DOI：
10.1088/0022-3727/27/6/023
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发表时间：
1994-06-14
影响因子：
3.4
通讯作者：
SUARASAN, I
中科院分区：
文献类型：
--
作者：
DASCALESCU, L;MORAR, R;SUARASAN, I
电晕充电现象的物理学对于诸如粉尘沉淀、粉末喷雾和颗粒混合物的选择性分选等电技术的发展是至关重要的。本研究着重于电晕放电在电分离过程中的应用。粗略的理论评估指出，在这种应用中所需的电晕电流密度和高电压水平取决于各种因素，如材料特性，进料速率和电极系统的配置。在实验室辊式电分离器上进行的实验证明了一种新的电晕电极设计产生扩展和准均匀电晕场的能力。当从可逆非滤波全桥高压整流器以正极性和负极性激励该电极时，获得稳定的电晕放电。在不同的操作条件下测定了新电极电晕放电的电压-电流特性：（i）在电极间间隙中没有材料;（ii）在接地电极表面上具有50%铝-50%聚氯乙烯颗粒混合物的单层;（iii）具有类似的金属颗粒单层（99%铝）;和（iv）一层绝缘颗粒（99%聚氯乙烯）。在每种情况下，注意可接受的工作电压上限，以及电晕放电的一些副作用，如可听噪声和臭氧的产生。电晕充电的功效进行了评估，涉及两组颗粒材料的电分离试验：（一）大麦颗粒，杂质与杂草和土壤颗粒;和（ii）金属和塑料的颗粒混合物，产生切碎电线和电缆废料。几个实际的考虑，制定了实验结果的批判性评价的基础上。
The physics of corona charging phenomena is of paramount importance for the development of such electrotechnologies as precipitation of dust, spraying of powders and selective sorting of particulate mixtures. This study focused on the use of corona discharge in electroseparation processes. Crude theoretical evaluations pointed out that the required corona current density and high-voltage level in this application depend on various factors, such as material characteristics, feed rate and configuration of the electrode system. Experiments carried out on a laboratory roll-type electroseparator demonstrated the capability of a new corona electrode design to generate an extended and quasi-uniform corona field. Stable corona discharges were obtained when energizing that electrode at both positive and negative polarities from a reversible non-filtered full-bridge high-voltage rectifier. The voltage-current characteristics of the corona discharge from the new electrode were determined under various operating conditions: (i) without material in the inter-electrode gap; (ii) with a monolayer of a 50% aluminium-50% polyvinyl chloride particulate mixture on the surface of the grounded electrode; (iii) with a similar monolayer of metallic particles (99% aluminium); and (iv) with a layer of insulating particles (99% polyvinyl chloride). In each case, attention was paid to the upper acceptable limit of operating voltage, as well as to some side effects of corona discharges, such as audible noise and ozone generation. The efficacy of corona charging was assessed by electroseparation tests involving two groups of particulate materials: (i) barley grains, impurified with weeds and soil particulates; and (ii) granular mixtures of metals and plastics, yielded by chopping electric wire and cable scrap. Several practical considerations were formulated, based on a critical evaluation of the experimental results.