Calculation of the costs recoupment

Rough efficiency of DC electric arc furnaces with the capacity from 1,5 up to 6,0t in comparison with similar AC electric furnaces


Name

ДСПТ-1,5

ДСПТ-3

ДСПТ-6

1. Annual design capacity, t/year

5000…7000

10000…15000

25000…30000

2. Operating costs reduction due to the decreasing of consumption of:

- electrodes, t/year;

- electric power, million kWh/year;

- refractory materials, t/year;

- row material, t/year.

 

27…32

0,3…0,4

30…40

75…100

 

50…55

0,5…0,8

60…70

150…200

 

70…90

0.6…1,0

80…100

200…300

3. Additional expenditure pay-back period, year

1,0…1,5

0,9…1,0

0,6…0,7

Rough efficiency of DC electric arc furnaces with the capacity from 12 up to 25t in comparison with similar AC electric furnaces


Name

ДСПТ-12

ДСПТ-25

1. Annual design capacity, t/year

40000…50000

80000…90000

2. Operating costs reduction due to the decreasing of consumption of:

- electrodes, t/year;

- electric power, million kWh/year;

- refractory materials, t/year;

- row material, t/year.


120…150
2,0…2,5
70…80
800…1000


240…300
4,0…4,5
140…160
1600…1800

3. Additional expenditure pay-back period, year

0,7…1,0

0,6…1,0

Notes:
1. Economic benefit is mentioned during ordinary steel melting. During alloyed steel melting economic benefit increases in 1,2 … 1,5 times (pay-back period accordingly decreases).
2. Economy does not include:
a) benefit of the expensive alloying components loss reduction;
b) gas purification and nature protection actions costs reduction;
c) electric equipment, cable production, etc resource increasing;
d) lining and repair works costs reduction;
e) smelted metal qualities improving.
The term of the costs recoupment is from 6 up to 12 months.

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