Temperature Distributions In Furnace Research Articles

DESIGN OF GRADIENTLESS FURNACES

Temperature distributions in cylindrical furnaces are discussed, and design data are given which permit the construction of short furnaces in which the temperature varies less than 0.5% along the central half of the length of the heater. Formulae are also given for the calculation of temperature distributions in conventional furnaces with uniformly wound heaters.

A. 鋼材工場に於ける熱經濟に就て

Temperature distributions in several heating furnaces in Yawata Steel Works, firing gases and airs supplied to them were measured. From these results, heat distributions of each furnace were calculated.(1) In wire mill, distributions of supplied heat which consisted of those absorbed by billets, waste gases and transmitted by radiation and conduction become 48·5, 20·4 and 31-1 percents respectively. In this case, coal equivalent of billets in heating corresponds to 59 kilograms per ton. If we make the most of the waste heat by utilising the suitable insulating materials and consider the present actual work, the above heat distributions probably may be attained to the values of 75·4, 18·7 and 6·8 percents respectively. Then, coal equivalent will become 40 kilograms per ton of heated billets.(2) In hot rolling furnace of tin plate mill, distributions of heat supplied to the sheet bars, waste gases and radiation and conduction become 44·75, 23·20 and 32·05 percents respectively. But. if we consider the actual heat emitted in the furnace, the heat contained in sheet bars amounts to 58·23 percents.(3) In the case of soaking pit of the blooming mill, distributions of heat given to the blooms, waste gases and others become 40·45, 23·16 and 36·39 percents respectively.