What are the characteristics of tubular heating furnace

　　Tubular heating furnace is a process heating furnace used in petroleum refining, petrochemical industry, chemical and chemical fiber industry. It has some characteristics that other industrial furnaces do not have. Its basic features: it has a combustion chamber surrounded by refractory materials and uses the heat generated by fuel combustion to heat substances. Let's analyze the characteristics of the lower tubular heating furnace: 1) The heated material flows in the tube, so it is limited to heating gas or liquid; 2) The heating mode is direct fire type; 3) Burn only liquid or gaseous fuels; 4) Long term continuous operation and uninterrupted operation.