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为提高金属加热的均匀性(±5℃),必须进一步改进台车式炉的结构,使之能在更宽的温度范围(300～1050℃)内工作。炉子的这种通用性使供热功率要在一个很大的范围内变化(3～5倍,有时8倍),结果便使金属加热在经济管理和保证质量方面复杂起来。在炉膛内建立热气体强烈的再循环是获得均匀加热的有效方法之一。利用空气以及燃料—空气流股的动能,建了大量的再循环式炉。这些炉子可以保证相当高的加热均匀性(±10～15℃),但砌体笨重,更主要的缺点是要以较高的空气过剩系数工作,在保温期和低温操作制度下尤其如此。这就导致燃料消耗过高。
In order to improve the uniformity of metal heating (± 5 ° C), the structure of the trolley furnace must be further improved so that it can operate over a wider temperature range (300 to 1050 ° C). This versatility of the furnace allows the heating power to vary widely (3 to 5 times, sometimes 8 times) over a wide range of temperatures, with the result that metal heating is complicated by economic management and quality assurance. Establishing a strong recirculation of hot gases in the furnace is one of the effective ways to achieve uniform heating. Utilizing the kinetic energy of air and fuel-air streams, a large number of recirculation furnaces were built. These furnaces guarantee a very high uniformity of heating (± 10 to 15 ° C), but masonry bulking, the more important drawback, is the need to work with a high air excess coefficient, especially during holding and low temperature operating regimes. This leads to excessive fuel consumption.