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Аннотация Two variants of a method of account of the recuperator are given in the article, used for air heating and placed in the bottom space blast stove below the level of admission of blowing. The outcomes of accounts of the recuperator with use of the given method are indicated. The analysis of outcomes of these accounts has confirmed reliability of an offered method of account, efficiency and advantages of its place in the bottom space blast for air heating in blast stove in comparison with other types of blast stove. The accounts also confirm a possibility to have high temperatures of heating of blast blowing if space blast of blast stove is heated only by blast gas (without the component to it of natural or coke firing gas)