燃料氣與空氣的流動方式   主要可以歸納為四種，燃料氣噴射到靜止的空氣中；燃料氣和空氣平行流動；燃料氣和空氣流動時相互之間有一定的夾角；燃料氣和空氣呈旋流運動。

The flow of fuel gas and air can be divided into four main types, the fuel gas injected into the air; the fuel gas and the air flow in parallel; the fuel gas and the air flow between a certain angle; the fuel gas and air in a cyclone movement.

在使燃料能完全燃燒的情況下希望空氣過剩系數(shù)越低越好。但過低可能造成燃燒不完全，而過高將增加了爐內空氣量，降低爐子的熱效率，對于強制通風或引風，還將增加動力消耗，煙氣中的氧含量過多也將增加對爐管和其他部件的損失。

It is hoped that the higher the air surplus coefficient, the better the fuel can be completely burned. But too low may cause incomplete combustion, and too high will increase the volume of air in the furnace and reduce the thermal efficiency of the furnace. For forced ventilation or induced draught, it will also increase power cumption and excessive oxygen content in the flue gas will also increase the loss of furnace tubes and other components.

在擴散燃燒時，火焰的形狀是長矩形，火焰內部是燃料氣，外部是助燃空氣，燃料氣與空氣的混合是依靠擴散方式進行。當開始預混空氣后，火焰的形狀開始發(fā)生變化.

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.

轉底式加熱爐

爐身固定，爐底轉動，放置在爐底上的料坯隨爐底轉動由進料口移送到出料口。根據(jù)爐底的形狀，轉底式加熱爐可分為環(huán)形爐和盤形爐兩種，冶金廠軋鋼車間多用環(huán)形爐。

Bottom reheating furnace

The furnace body is fixed and the bottom of the furnace is rotated, and the billet placed on the bottom of the furnace is transferred to the discharge port from the feed inlet with the rotation of the furnace bottom. According to the shape of the furnace bottom, the rotary hearth furnace can be divided into two types: the annular furnace and the disc type furnace.