rp graphite electrodes supplier
Calculation method of graphite electrode consumption in electric arc furnace
The calculation method of electric arc furnace graphite electrode consumption The graphite electrode is the last part of the electric arc furnace short-circuit power supply network. Through the end of the graphite electrode, a strong electric arc is generated to melt the charge and heat the molten steel.
In other words, the graphite electrode is the central hub that converts electrical energy into heat. When the graphite electrode is working, it is impacted by high temperature, furnace gas oxidation and collapsed materials. In particular, the connection between the two graphite electrodes has higher resistance and poorer conductivity than other places, and is prone to tripping and oxidation, which greatly consumes the graphite electrode, prolongs the smelting time, and reduces the productivity. In 1982, rp graphite electrodes supplier divided normal graphite electrode consumption into front-end consumption and side-side consumption. The calculation formula is as follows: Normal consumption of graphite electrode: CE=Cγ+CS Front-end consumption: Cγ=Vγ·tontap/W, Vγ= kγ·I2/dNγ Where: tontap——electric furnace power supply time, h; W——electric furnace tapping weight, t; Vγ-graphite electrode front-end consumption speed, kg/h; Kγ-front-end consumption constant (given by Bowman Kγ=0.0361, AC arc furnace N is usually 0.58); I——arc current intensity, Ka; Dγ-graphite electrode front end diameter, M. Side consumption: CS=vs.ttop top/W, vs=3ks.s In the formula: ttop-electric furnace top melting cycle, h; W-electric furnace tapping weight, t; Vs-graphite electrode side consumption speed, kg/ h; KS-oxidation consumption rate, kg/(m2·h); oxidation surface area in graphite electrode furnace, M2.
At present, in the production process of rp graphite electrodes supplier, the consumption model of Bowmangraphite electrode has been widely recognized. Wang Mingli and others believe that once the smelting process is stable, the current supply has the greatest impact on the unit consumption of the graphite electrode. According to Bowman model, 60t electric arc furnace current has the greatest influence on graphite electrode consumption and melting time, as shown in Table 1. Table 1 The influence of current on graphite electrode unit consumption and smelting time Generally speaking, the calculation of graphite electrode consumption during the smelting process has two concepts: net consumption and total consumption. Net consumption refers to the technical consumption of graphite electrode consumed by high-temperature sublimation, oxidation and reaction; total consumption refers to the sum of net consumption and losses caused by incomplete smelting, that is to say, the above-mentioned graphite electrode consumption model is only technical Consumption, that is, it is classified as net consumption.
At present, rp graphite electrodes supplier mainly uses the following two methods to calculate graphite electrode consumption.
(1) The yield method output method is based on the amount of molten steel (finished product) produced in a certain period of time, taking the input amount of the graphite electrode in the same period minus the remaining amount on the furnace as the consumption. Total consumption of graphite electrode per ton of steel MM=MZ/MG Net consumption of graphite electrode per ton of steel: MJ=MC/MG Where: MZ——Total consumption of graphite electrode (input——residual amount on furnace), kg/T; MC ——The pure consumption of graphite electrode (input——residual in the furnace——loss), kg/T; Mg——the amount of molten steel.
(2) Electricity consumption method. The electricity consumption method is based on the cumulative electricity consumption of the pure heating time in a certain period of time. The electricity consumption is based on the input amount of graphite electrode minus the remaining amount on the furnace during the same period. calculate). Graphite electrode consumption per kilowatt-hour: MX=1000×MC/QH where: MC-pure consumption of graphite electrode (input-residual in the furnace-loss), kg/T; QH-cumulative power during pure heating time Consumption measurement, kW·H.
At present, when rp graphite electrodes supplier calculates the graphite electrode loss, it generally includes the loss caused by incomplete smelting into the calculation, which can more fully reflect the center of gravity and the focus of loss in the electric arc furnace steelmaking process, so as to find out The insufficiency of process parameters should be solved.