Transformer on-load voltage regulation construction method based on electrical smelting furnace for magnesium

Abstract

The invention discloses a transformer on-load voltage regulation construction method based on an electrical smelting furnace for magnesium. The transformer on-load voltage regulation construction method comprises the steps of: analyzing power requirement taking electrode positions and voltage values as independent variables; establishing an optimization object based on minimum unit energy consumption and a hull sand rate according to the power requirement; solving an optimization problem, and determining voltage values and action time at filling stages; and planning an on-load voltage regulation scheme according to the voltage values and action time at the filling stages. The step of analyzing power requirement taking the electrode positions and the voltage values as the independent variables is implemented by: taking arc heat as an internal heat source of an temperature field model of the electrical smelting furnace for magnesium, and establishing an internal heat source arc and gas cavity conduction region model; and carrying out data fitting on a relation of magnesium oxide specific heat capacity c to temperature as well as a relation of density rho to temperature separately, so as to obtain action relations between temperature variation and the voltage at the stages, the voltage action time and electrode lifting height. The transformer on-load voltage regulation construction method can make two indexes including fused magnesite unit energy consumption and melting lump hull sand rate superior to that of the existing constant-current control strategy, and is of great guiding significance to the production process of the electrical smelting furnace for magnesium.

Description

technical field [0001] The invention relates to a fault detection and diagnosis technology, in particular to a construction method for on-load voltage regulation of a transformer based on a fused magnesia furnace. Background technique [0002] Magnesium is one of the light metal elements widely distributed in nature and a natural metal with important use value. Every country attaches great importance to the development and utilization of magnesium resources. It is an extremely important strategic resource and occupies a pivotal position in modern industry. China's magnesite reserves are very large, but the distribution area is relatively small, mainly concentrated in Shandong, Liaoning and other provinces. Liaoning magnesite resources are very rich. According to geological surveys, there are more than 10 mining areas with reserves of 2.5 billion tons, accounting for about 85% of the country's total reserves, accounting for about 20% of the world's total reserves. The magne...

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Problems solved by technology

[0009] In view of the low level of automation and serious energy consumption in the production process of fused magnesia in the prior art, the problem to be solved by the present invention is to provide a method that can make the unit energy consumption of fused magnesia and the sand rate of fused lumps The indicators are superior to the existing constant current control strategy based on the fused magnesia furnace based on the transformer on-load voltage regulation construction method based on the fused magnesia furnace

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