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A method for long-time shutdown of submerged arc furnace to protect electrodes

A furnace shutdown protection, long-term technology, applied in the direction of furnace, electric furnace heating, furnace components, etc., can solve the company's profit impact and other problems, achieve the effect of reducing workload, reducing safety risks, and reducing the probability of hard electrode breakage

Active Publication Date: 2019-03-08
嘉峪关宏电铁合金有限责任公司
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Problems solved by technology

[0003] In 2014 and 2015, the electrodes of two 25MW ferrosilicon submerged arc furnaces in our unit were hard broken 28 times and 20 times respectively after long-term shutdown, and the direct economic loss was 4.75 million yuan, which had a great impact on the company's benefits.

Method used

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Embodiment Construction

[0009] A method for long-term shutdown of a submerged arc furnace to protect electrodes, comprising the following steps:

[0010] Step 1: Control the electrode length and electrode position before power failure: according to the length of maintenance time, control the electrode pressure and discharge in advance and shorten the electrode consumption to reduce the influence of the electrode's own weight; adjust the degree of electrode deflection to ensure the stability of the electrode The natural verticality prevents the electrode from being hard broken due to the force in the opposite direction due to deflection; after the electrode pressure is stopped, the electrode is lowered to between 500mm-800mm to reduce the exposed leakage area of ​​the electrode and prevent oxidation; After discharge, the material surface is lowered to below the furnace shell 300mm, making preparations for shutdown and maintenance;

[0011] Step 2: After the power failure, heat preservation and anti-ox...

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Abstract

The invention discloses a method for blowing out a submerged arc furnace for a long time to protect an electrode. The method comprises the following steps of: controlling electrode length and an electrode position before power failure; and after power failure, carrying out operations such as thermal insulation, anti-oxidization work and regulation on a power supply system after power transmission on the electrode. On one hand, electrode hard breakage probability caused by furnace long-time blowout is reduced, so that positive effects are brought for cost decreasing and benefit increasing of enterprises; on the other hand, unnecessary workload of staff is reduced by reducing electrode hard breakage times, so that safety risks are reduced.

Description

technical field [0001] The invention relates to the technical field of ore smelting, in particular to a method for protecting electrodes of a submerged arc furnace when the furnace is shut down for a long time. Background technique [0002] Traditionally, for electrodes that have been shut down for more than 8 hours, hard electrode breakage accidents are very likely to occur during the restoration of power transmission. Resulting in shutdown and increased production costs. In addition to strengthening the management of electrode paste (dust prevention) to prevent electrode hard break accidents, two measures are mainly taken: one is to choose the best electrode paste formula, and the other is to reduce heat stop. The electrode paste of the self-baking electrode tends to shrink due to the coked binder during firing, while the filled solid material is stable at this temperature. These differences in physical properties lead to thermal stresses within the material: the solid p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F27D19/00F27D11/10
CPCF27D11/10F27D19/00
Inventor 展鹏程刘保华雷宪军
Owner 嘉峪关宏电铁合金有限责任公司
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