A continuous reheating industrial furnace is large inertia,pure delay,multi-variables,time-vary-ing,intercoupling complicated controlled plant,and has many uncertain factors.
Single chamber high pressure gas quenching vacuum furnace,double chamber and multichamber vacuum furnaces implementing the acetylene low pressure carburizing were briefly introduced.
The important effects of hydrodynamical characteristics of spray flame on heat exchange in the upper flame space of glass furnace were briefly expounded.