The natural gas hood furnace, also known as the natural gas bell hood furnace, is mainly composed of heating hood, furnace platform, inner tank, combustion system, pipeline system, exhaust system, self-control system, power control system and other main parts. The heating hood is made of steel and steel plates welded into a rigid structure with good air tightness. Fully considering the influence of thermal expansion and the stability of lifting in the design, the steel structure is lightweight, durable, and deformation free. Considering that the furnace expands/contracts with temperature changes during operation, the steel structure of the furnace body has expansion! Contraction absorption function. In any case, the furnace body will not expand due to expansion! Shrinking and causing deformation.