The Design And Research On Electrode Holder Of The Submerged-arc Furnace

Submerged-arc furnace is a kind of primary equipment for ferroalloy smelting, and the electrode holder system is used for transferring powerful electric current to the electrode, clamping the contact shoe to the electrode, controlling the sintering of electrode. Through the electrode holder's developing course and the practice on the engineering, the types of electrode holder are analyzed. And it points out the advantages and disadvantages of these types.At present, the conical ring electrode holder is the mostly used in China, but this kind of structure is relatively old, it is precarious on clamping and pressing electrode, which results in the longtime and high-frequency repairing. It affected production badly, so much as bringing on accidents of electrode, and so on.According to the practical experience and the situation of China , a design that a new pressure ring holder was put forward , which is a substitute for the conical ring electrode holder. The method of design can be described as below: substituting fluid oil urn and bolt for the bellows, perfect clamping structure for the contact shoes, which make the contact force symmetrical, taking the high temperature -resistant pressurize at the tail end of the oil urn, which reach the good effect, adopting the design of settled big cover and active cover, which make good pressurize and guiding effect. A lot of measures were put forward to solve these problems, which are mentioned above, for instance, ameliorating the channels of cooling water and using soft water, reducing the quantities of welding line, improving the jointing process, and so on. These measures have made definite effect.A calculation had been used for the heat transfer of electrode holder, which rectified the mistake that existed in the conventional designs of electrode holder, and lessen the investment of cooling equipment. In virtue of the heat transfer calculating of the electrode holder, the configuration designing and parameters choosing of the electrode holder are researched. The factors which affect the heat transfer of the electrode holder are listed as follows: velocity of the cooling water, thickness of the water cooling wall, water scale thickness, and temperature of the flue gas. It fully considers the boundary conditions for electrode holder and analyzes the variation tendency of heat transfer in the different parameters. All these provide a basis for the design and apply of the electrode holder. The computational programs had been written and run by MATLAB (Matrix Laboratory).The results of heat transfer indicate the following. The temperature of cooling water and wall will drop along with the rise of the altitude, and the wall's temperature of smoke gas side is higher than that of air side. the increase of water's capacity will be propitious to debasing the wall's temperature at a certain extent. The thicker wall will not propitious to cooling water's heat transferring. The temperature of smoke gas is the important factor of the heat transferring. At the same time, the temperature of the exit water and wall are found out. At the some time, resistance losing of the water passage in the holder is calculated, and it will provide theory gist for water pump's choosing.The drawings of electrode holder of 7500kVA submerged-arc furnace had been finished by using AutoCAD. The drawings can be used to project construction directly. The design for the electrode holder at submerged-arc furnace has been applied in many corporations and factories. It has made great benefit to the corporations and factories.