A study on electrical resistivity characteristics of Pakistani coal char for earth grounding system

IF 0.1 Q4 ENGINEERING, CHEMICAL Journal of the Pakistan Institute of Chemical Engineers Pub Date : 2023-06-11 DOI:10.54693/piche.05113

Muhammad Zafar, None Abdul Rauf, None Hafiz Usama Qureshi, None Muhammad Rizwan, None Khurram Siddique, None Syed Muhammad Imran, Muhammad Mudassar

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Abstract

In this study we aim to investigate the electrical conductivity and physiochemical properties of the selected coal samples for their application in earth grounding systems. Three different ranked coals namely Thar brown lignite (BL), Chamalang bituminous coal (BC) and semi-anthracite Dera Adam Khail (SC) coals were selected and their respective chars were prepared at 4500 C and subjected to the ground resistivity potential test using the universal earth grounding tester. Through experiments, it was found that BL coal has the least reactivity value and best conducting properties for electric current, followed by the SC and BC in descending order. It has been suggested that high moisture content and dissolved salts may act like an electrolytic medium for current passage in BL that is the reason for low resistivity value. The presence of low conductivity minerals in small percentage having relatively higher mass could be the reason for higher resistivity value in coal samples. Moreover, compared to raw coals, prepared char samples showed an improvement in electric current conductivity and lowered the resistivity values for all the ranks of selected samples.

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接地系统用巴基斯坦煤焦的电阻率特性研究

在这项研究中，我们旨在研究所选煤样品的电导率和物理化学性质，以用于接地系统。选取塔尔褐煤(BL)、查马朗烟煤(BC)和半无烟煤(SC)三种不同等级的煤，在4500℃下制备各自的炭，并使用通用接地测试仪进行接地电阻率电位测试。通过实验发现，BL煤对电流的反应性值最小，导电性能最好，SC煤次之，BC煤次之。有分析认为，高含水率和高溶解盐可能是BL中电流通过的电解介质，这是低电阻率值的原因。低电导率矿物的存在比例小，质量相对较高，可能是煤样电阻率值较高的原因。此外，与原煤相比，制备的炭样的电流导电性有所提高，所选样品的各级电阻率值均有所降低。

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Journal of the Pakistan Institute of Chemical Engineers ENGINEERING, CHEMICAL-

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