在扩散燃烧时，火焰的形状是长矩形，火焰内部是燃料气，外部是助燃空气，燃料气与空气的混合是依靠扩散方式进行。当开始预混空气后，火焰的形状开始发生变化.

In diffusion combustion, the shape of the flame is long rectangle, the fuel inside the flame is external, the external combustion air is, the mixing of fuel gas and air depends on the diffusion mode. When the air is premixed, the shape of the flame begins to change.

加热炉能快速加热，氧化和脱碳少，适用于加热圆形料坯和钢管。与行星轧机相配合，可用来加热连铸板坯；也可对某些钢材进行局部加热。缺点是单位炉长的生产能力低，炉子热效率较低。

The heating furnace can be heated quickly, with less oxidation and decarburization, and is suitable for heating round billets and steel pipes. It can be used for heating continuous casting slab and heating some steel products. The drawback is that the production capacity of unit furnace length is low and furnace thermal efficiency is low.

台车式加热炉是加热炉系列中常见的一种加热设备，台车式加热炉的结构简单，比较通用，而且操作容易，适合于钢铁、石油、化工等多个产业。

The trolley type heating furnace is one of the most common heating equipment in the series of heating furnace. The structure of the trolley type heating furnace is simple, common and easy to operate. It is suitable for many industries, such as steel, petroleum, chemical industry and so on.

焚烧时司炉工不能面对火嘴及看火窗，避免回火伤人。如火焰平息，应当即封闭燃料阀，炉膛内需用蒸汽吹扫后，方能重新焚烧。进入炉内维修时，应处置进入设备内作业手续。防爆门不得用其它物件堵死，避免失掉防爆效果。引时要注意脱净存水及凝缩油，并在安全地址排空15分钟以上，经化验剖析含氧量小于1%,方可投用焚烧。进炉前一定要通过阻火器。Whentheairispremixed,theshapeoftheflamebeginstochange。

When burning, the stoker can not face the fire mouth and look at the fire windows, so as to ***oid backfire and injure people. If the flame is subsided, the fuel valve should be closed immediately, and the furnace needs to be cleaned by steam before it can be re burned. When entering the furnace maintenance, the operation procedures for entering the equipment should be of. The explosion-proof door should not be blocked by other objects, so as to ***oid the explosion proof effect. Attention should be paid to the removal of water and condensate when gas diversion, and more than 15 minutes at a safe address, after analysis of laboratory oxygen content less than 1%, can be put into incineration. Gas must be passed through the flame arrester before entering the furnace.