Benxi Steel improves energy efficiency

Posted on 08 October 2010
 

State-owned Benxi Steel has been advancing in improvement of its energy efficiency with a series of energy management programmes. In the first half of 2010, Benxi Steel's composite energy intensity was reduced to 685.9 kgce/tonne of steel, its best level compared to the same period in the previous years.

The improvement in energy efficiency in the first half of 2010 is attributable to the reduction in the coke ratio, freshwater intensity, electricity intensity and so on. Early this year, Benxi Steel set up a few targets for key environmental indicators.

The targets were broken down to individual sites and a performance review was conducted. A new top recovery turbine (TRT) system is contributing to the increased recycling rate of gas from both blast furnace and converter and, as a result, power generation through the recycled gas increased sharply. In the meantime, the recycling rate of the waste steam from the coke dry quenching (CDQ) system also has increased significantly.

In the second quarter of 2010, freshwater intensity was 18% less than the target established early this year and blast furnace waste gas emissions was 31% less than the target. Expenditure for electricity was reduced by 12% and water expenditure was 19% less than the target. However, the recycling rate of converter gas did not reach the target and improvement is expected in the second half of 2010.

In the second quarter of 2010, freshwater intensity was 18% less than the target established early this year and blast furnace waste gas emissions was 31% less than the target. Expenditure for electricity was reduced by 12% and water expenditure was 19% less than the target. However, the recycling rate of converter gas did not reach the target and improvement is expected in the second half of 2010.




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