ELECTRODE MANAGEMENT – INVESTIGATION INTO ... - Pyro.co.za

Electrode Management – Investigation into Soft Breaks At 48MVA FeCr Closed Furnace 747
3. CASE – 2
3.1 Description of electrode condition at the time of soft break (date of breakage 26th Apr’05)
In this case also, liquid paste was observed leaking through the casing holes below the contact clamp tip
where casing was punctured. Paste level was measured and found minus 0.2mtr i.e. below the contact clamp
top position. This time, it took 04 days to clear total leaked paste all around the electrode to switch on the
furnace with all necessary arrangements.
3.2 Data presented before the breakage relating to currents, slipping and paste temperature
Table 4
Date Time in Hrs Electrode current (kA) Slipping in mm In hrs.
(Slipping/time in hrs)
E1 E2 E3 E1 E2 E3
24/04/2005 6:00 64 74 62 20 20
7:00 60 60 60 20
8:00 73 72 65 20
9:00 72 73 67 20
10:00 70 65 65 20 20
11:00 75 77 76 20
12:00 77 72 68 20
13:00 80 80 65 20
14:00 66 71 67 20 20
15:00 80 79 70 20
16:00 75 61 67 20
17:00 72 67 65 20 20
18:00 64 64 59 20
19:00 75 81 63 20
20:00 81 60 52 20 20
21:00 83 73 78 20
22:00 73 83 73 20
23:00 78 82 75 20 20
0:00 80 80 78 20
1:00 76 76 65 20
2:00 70 69 56 20 20
3:00 80 71 66 20
4:00 73 79 43 20
5:00 65 73 50 20 20
6:00 61 66 40 20
25/04/2005 6:00 61 66 40 20
7:00
8:00 46 48 12 20
9:00 60 70 30 20 20
10:00 64 72 24
11:00 62 70 22 20 20
12:00 60 46 24 20
13:00 52 62 32 20
14:00 64 68 36 20
15:00 66 70 50 20 20
16:00 (15:30)