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根据炼铁高炉的实践,炼焦精煤灰分每增高1％,由于焦炭耗量增加而多用精媒3.55％。这种无谓消耗纯属浪费能源。 作者建议在确定炼焦精煤灰分时,用每1％灰分波动引起的精煤回收率变化,△A/△r作为评价指标。考虑到不同选煤过程的洗选效率和经济因素,从可选性资料上反映的这个比值应为6～8％(对重介选)或7～9％(对跳汰选)。 考查了12个选煤厂的实践资料,发现大多数精煤灰分都是定在这个比值小于上述评价指标。这就是说,因精煤灰分较高而高炉需要多消耗的额外精煤不能为精煤回收率提高而弥补。 决策者在给各选煤厂规定精煤指标时应注意到这个事实,以期达到最大限度的节能。
According to the practice of ironmaking blast furnace, coking coal ash increased by 1% each, due to the increased use of coke and the use of fine media 3.55%. This unnecessary consumption is a waste of energy. The authors suggest that, when determining the ash content of the coking coal, the change of the coal recovery rate caused by the fluctuation of 1% ash content, △ A / △ r is taken as the evaluation index. Taking into account the washing efficiency and economic factors of different coal preparation processes, the ratio reflected from the optional data should be 6 to 8% (for HM) or 7 to 9% (for jig selection). After examining the practice data of 12 coal preparation plants, it was found that most of the fine coal ash content was set at a ratio lower than the above evaluation index. This means that because of the high ash content of the clean coal, the additional clean coal that the blast furnace needs to consume more can not make up for the increase of the clean coal recovery rate. Policymakers should take note of this fact when setting coal clean coal targets for all coal preparation plants, with a view to achieving maximum energy savings.