Medium-velocity burners are the burners that the POC (products of combustion) velocity from the burner exit peaks at 40 m/s. These burners are usually used in melting, steel preheating and hot gas generators. Although usage of these burners is widespread, care should be taken while setting combustion parameters. One of the drawbacks is starting them with air pressure less than design pressure. This leads to POC velocity reduction converting the burner to a low-velocity type. Sometimes they are used instead of high-velocity burners, which eventually leads to non-uniform heating.
The conventional usage of these burners is for wide steel preheating furnaces while these burners flame length is 20 percent longer than other medium velocity burners. The available burner heads are refractory and can be extended and armored for rotary furnaces to start firing further from the beginning of the furnace.