燃料氣與空氣的流動(dòng)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(dòng)；燃料氣和空氣流動(dòng)時(shí)相互之間有一定的夾角；燃料氣和空氣呈旋流運(yùn)動(dòng)。

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(guò)剩系數(shù)越低越好。但過(guò)低可能造成燃燒不完全，而過(guò)高將增加了爐內(nèi)空氣量，降低爐子的熱效率，對(duì)于強(qiáng)制通風(fēng)或引風(fēng)，還將增加動(dòng)力消耗，煙氣中的氧含量過(guò)多也將增加對(duì)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(kuò)散燃燒時(shí)，火焰的形狀是長(zhǎng)矩形，火焰內(nèi)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(kuò)散方式進(jìn)行。當(dāng)開(kāi)始預(yù)混空氣后，火焰的形狀開(kāi)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(zhuǎn)底式加熱爐

爐身固定，爐底轉(zhuǎn)動(dòng)，放置在爐底上的料坯隨爐底轉(zhuǎn)動(dòng)由進(jìn)料口移送到出料口。根據(jù)爐底的形狀，轉(zhuǎn)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.