EURO-ECO 2007 Hanover 4 - 5 December 2007	Environmental and Engineering Aspects for sustainable living
	European Academy of Natural Sciences, Hanover European Scientific Society, Hanover Russian Academy of Natural Sciences, Moscow

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Shalaginov A.A.

The aim of the present study is the evaluation of technical condition and development of new economically efficient heavy-current contact systems (HCCS) of electrolyzers in chemical industry.

Evaluation of the technical condition of the HCCS of interpot and angular busbar for electrolyzers has been performed in the electrowinning plants of a number of chemical industrial enterprises by measuring the voltage drop and checking of compliance of the acquired values to the branch standard OST 6-01-39-83 entitled “Electrical Contact Connections of Electrolyzer Busbars in Chemical Industry” and the trade standards. The research has been conducted on HCCSs of electrolyzers type BGK-100 designed for rated current of 100 kA and electrolyzers type BGK-50/25 designed for rated current of 50 kA. Thus, for electrolyzers type BGK-100 with rated current of 100 kA the limit voltage drop value shall equal 33 mV, and for electrolyzers type BGK-50/25 with rated current of 50 kA the limit voltage drop value shall equal 23 mV in compliance with the branch standard OST. All the voltage drop value measurements were taken down into the test record sheets, and the values were used as basis for drawing the characteristic curves for parallel bars of interpot busbar for electrolyzers N as function of voltage drop U. The results of research conducted at chemical enterprises have shown complete noncompliance of the voltage drop on HCCS with the requirements listed in OST. Thus a decision was taken to develop a package of measures aimed at decreasing the voltage drop and its compliance with the OST. The research required selection of several test HCCSs of electrolyzers types BGK-100 and BGK-50/25, part of them compiled to the traditional technology, and another part compiled with diverse improvements, using various conductive pastes and lubricants. HCCS research has been performed in the course of several years, all the measurements were taken down into the test record sheets, and these were used as basis for drawing the characteristic curves for voltage drop U as function of time t. Experimental dependences based on characteristic curves were calculated using least square method; these allow to determine the electrical resistance of HCCS R of the electrolyzers in the given time interval t. The results have shown that the curves acquired match the experimental data.