Discussion on reduction power supply
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Using a high-voltage breakdown silicon core is, overall, quite effective and stable. Nowadays, high-voltage breakdown is probably used everywhere; low-voltage methods are less common now. Let’s discuss the voltage-current relationship of the reduction furnace transformer. Let me talk about it: the 9-bar version is divided into eight levels, with the power increasing gradually – from 1575V 100A at level 1 to 215V 2300A at level 8. Hehe, let’s discuss the grading and control methods for the 12-bar and 24-bar versions as well.
Now, technically everything is closed off; those who have relevant materials, please share them a bit
12 pairs of rod reduction furnaces, as follows: 1. The length of each pair of rods is 4.64 meters (with a beam length of 0.24 meters); the length of 4 pairs of rods is 18.56 meters. 2. The pressure inside the furnace is 0.8–1.0 kilograms of pressure. 3. When heating is started, the oil temperature on the furnace wall should be above 1800°C. 4. 12 pairs of rods per furnace. 5. The diameter of the silicon core is Φ7–Φ8, and the average diameter of the largest silicon rods is Φ150. 6. The grid voltage fluctuation is designed at ±10%. 7. Electrode insulation is greater than 12 kV. 8. The process curve is determined by the following 5 points. Silicon rod current Silicon rod voltage Silicon rod power Initial point 50A 1800V 90kW 305A 965V 294kW 820A 518V 425kW 1580A 362V 572kW Final point 2600A 260V 676kW
24 pairs of rod pressurized reduction furnaces, as follows: 1. 4 pairs of rods with a total length of 4×5.23=20.92 meters; 2. 24 pairs of rods per furnace. 3. The grid voltage fluctuation is below ±10%. 4. During the preheating start-up phase of the silicon rod, the water temperature is greater than 150°C. 5. The initial diameter of the silicon core is Φ8. 6. The insulation class of the furnace body is superior to 12KV. 7. The average diameter of the finished product is Φ150. 8. It adopts a structure with 4 pairs of rods in the inner ring, 8 pairs in the middle ring, and 12 pairs in the outer ring. 9. Gas pressure: 6 KG. 10. The parameters for phases A and C are as follows: Gear number 1* 2* 1 2 3 4; Rated voltage: 2100V, 1050V, 2100V, 1080V, 670V, 460V; Operating current: 120A, 280A, 360A, 860A, 1680A, 2800A; Minimum inductance: 296μH, 148μH, 296μH, 152μH, 95μH, 65μH. Phase B has two identical secondary windings, with parameters as follows: Gear number 1* 2* 1 2 3 4; Rated voltage: 1050V, 525V, 1050V, 540V, 335V, 230V; Operating current: 120A, 280A, 360A, 860A, 1680A, 2800A; Minimum inductance: 148μH, 74μH, 148μH, 76μH, 47μH, 32μH. The allowable tolerance for the rated voltage in the first gear is +3%, while for the other gears it is ±2.5% ； The minimum leakage reactance allows only a positive tolerance.
It seems like the person upstairs knows a lot about the power supply for the reduction furnace! Which company’s? I’ll be sure to ask for more advice when I get the chance!