燃料气与空气的混合物在燃烧焰面法线方向的速度分量大于该混合物的火焰传播速度，则火焰被推出火孔，开始离焰，直到火焰被吹跑造成火焰熄火——脱火。燃烧器发生脱火是不允许的。

The velocity component of the mixture of fuel gas and air in the normal direction of combustion flame is larger than that of the mixture, and the flame is pushed out of the fire hole and starts to le***e the flame until the flame is blown away, causing the flame to go out. It is not allowed to remove fire from the burner.

用于加热小断面料坯的炉子只有预热段和加热段。

习惯上还按炉内安装烧嘴的供热带划分炉段，依供热带的数目把炉子称为一段式、二段式，以至五段式、六段式等。50～60年代，由于轧机能力加大，而推钢式炉的长度受到推钢长度的限制不能太长。

The furnace used for heating ***all broken fabric billet is only preheating section and heating section.

It is customary to divide the furnace section according to the heating belt with the burner in the furnace. According to the number of tropics, the furnace is called the one section, the two section, and the five section and the six section. In the 50~60 era, due to the increase of rolling mill capacity, the length of pusher furnace must not be too long due to the length of steel pushing.

台车式加热炉的组成包括加热炉本体和余热回收系统。余热回收系统中有一个空气预热器,空气预热器是又由非冷凝式空气预热器和冷凝式空气预热器两段组成。

The trolley heating furnace cists of a heater body and a waste heat recovery system. There is an air preheater in the waste heat recovery system. The air preheater is of a non-condensing air preheater and a condensing air preheater.