brief description of the process: Chromium, silica, coke and other qualified raw materials by the car into the factory, respectively stored in the corresponding raw material yard, with the loader load all kinds of raw materials into the bin, all kinds of raw materials according to the requirements of smelting formula ingredients, and fall to the mixing belt conveyor, and then use the big dip Angle belt machine to the main workshop three layer platform, through the rail type cloth car to join the furnace top bin. The charge enters the semi-closed high carbon ferrochrome furnace through the feeding pipe. The 33KV power supply is imported into the furnace by the transformer through the three-phase electrode. The electrode is transmitted to the furnace through the arc heating between the charge. Through the arc heat and resistance heat, the mixed material of chromium ore, silica and coke
Smelting and pouring are operated in three shifts, with 330 days per year. The flue gas produced by the electric furnace smelting enters the dust removal flue through the chimney, and the electric furnace produces the flue gas through the iron through the top suction cover, and the flue also enters the dust removal flue. The bag dust collector is arranged on the outside of the workshop, and the dust emission concentration after treatment reaches the national emission standards. The circulating cooling water of the electric furnace is supplied by the circulating water pump station. After the cooling water enters the electric furnace, it is naturally returned to the cooling pool with the drop. After natural cooling in the pool, the water is supplied to the furnace by water pump.
furnace transformer: Model of three-phase transformer: HSSP-12500 kVA / 33kV Rated capacity (KVA): 12500, long-term overload 20%, short-term overload 30% Cooling mode: OFWF,> 32ºC,> 45ºC. Primary voltage (KV): 33 Secondary voltage (V) 134~182V (3V, 17 in total) Secondary-rated voltage (V) 158 Secondary-rated current (kA) 45.68 Short circuit impedance <6% at 158V, coil internal impedance 5% Connection mode: Iio Pressure control mode: radio motion Insulation level: BIL480Ac200 Cooling mode: forced oil circulation and water cooling Side outgoing terminal: 3 phase 8 sets of outgoing copper pipe Ф 65 / 45 0-0.02, length 200 mm Three-phase cascade group: △ / △ -12 Frequency (HZ): 50
Electric furnace flue gas through the chimney into the dust removal system, the mouth of the flue gas through the gas cover, branch pipe (set the manual butterfly valve), also into the main dust removal system, and then the efficient cyclone will flue gas particles and some harmful impurities forced removal, by the main fan, from the dust pipe unilateral intake into the dust collector, some dust in the dust bucket natural settlement, and fine dust with airflow into the filter bag, the dust is blocked in the filter bag surface, gas after the filter bag. The dust on the inner wall of the filter bag gradually thicken, so that the resistance of the filter bag also increases correspondingly. Change the pneumatic butterfly valve regularly, and the filter chamber (unit) takes turns to stop filtering for reverse dust removal. Due to the sudden change of airflow direction, the filter bag changes
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