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燃料气的发热值:当其他条件相同时，燃料气的发热量越大，燃烧需要的空气量就越多，其混合时间也就越长。当炉子的燃料由热值低的燃料改为高热值燃料时，为了保证其完全燃烧，燃烧器在设计时需要注意改善燃料气与空气的混合条件。

The heating value of fuel gas when other conditi are the same, the greater the calorific value of fuel gas, the amount of air needed for burning more, the mixing time is longer. When the fuel of a furnace is changed from a fuel with low calorific value to a high calorific value fuel, in order to ensure its complete combustion, it is necessary to pay attention to improving the mixing condition of fuel gas and air in the design of the burner.

蓄热式加热炉是通过炉内热交换过程进行的，蓄热式加热炉的炉内热交换过程有三种基本方式，即：对流传热、传导传热、辐射传热。

The regenerative reheating furnace is carried out through the process of heat exchange in the furnace. There are three basic ways in the heat exchange process of the regenerative heating furnace, namely, convection heat transfer, conduction and heat transfer, and radiation heat transfer.

蓄热式加热炉的传导传热：传导传热是温度不同的物体直接接触（或物体存在温差）由于自由电子的运动（对于钢材）或分子的运动（对于炉气）而发生的热交换现象，此种传热发生在钢材表面及内部和钢材及炉底之间。

Conduction of conduction in a regenerative heating furnace: conduction heat transfer is the direct contact of a different temperature (or the existence of a temperature difference between a body) due to the movement of free electr (for steel) or the movement of molecules (for furnace gas), which occurs between the surface and inside of the steel and between the steel and the bottom of the furnace.

对流传热：对流传热是炉气与钢材表面接触时的热交换过程，包括炉气各部分发生位移所产生的对流作用及炉气分子之间的导热作用。

Convective heat transfer: convection heat transfer is the heat exchange process of the contact between the furnace gas and the steel surface, including the convection of the displacement of each part of the furnace gas and the heat conduction between the molecules of the furnace gas.