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The article compares calculation results in keeping with a mathematical model of industrial process of ethane pyrolysis carried out at the "Ethylene-Polyethylene" plant in Sumgait-city in terms of average permanent heat stress of the radiant coil with the results of the same process calculation but with the use of the proposed method of the zonal approach of fuel gas. When applying the latter, there is an essential fuel gas saving and higher yields of target products which ultimately provides the plant with considerable profit. Also, an expression has been suggested to determine optimum amount of fuel gas supplied to each zone. [ABSTRACT FROM AUTHOR]