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The heating method of the spheroidized annealing furnace and the recrystallization annealing furnace can be all-electric radiant tube heating, natural gas radiant tube heating + electric radiant tube heating, which is driven by rollers and rods to drive the workpiece to move. For example, natural gas heating can be converted into heat energy through the combustion of gas in the furnace to heat the workpiece or material, and is suitable for continuous annealing production by heat treatment such as steel pipes and rods. The continuous heat treatment production line consists of an inlet and outlet table, a furnace lining, a combustion system for gas, a waste heat utilization system, a temperature control system and an electrical automatic control operating system. It is the latest design of the annealing furnace. The gas heating system ensures a series of advantages such as safety, environmental protection, and energy saving. The heat loss is less, the service life is long, and the man-machine integration is realized, which is easy to operate, thereby improving the productivity. Its energy saving and environmental protection points are as follows:

1. Reasonable section distribution and furnace design for more flexible setting process, so as to better obtain product quality and lower energy consumption;

2. In the manufacturing process of the furnace, low thermal conductivity and low heat storage insulation materials are selected with advanced production technology, so that the temperature rise of the furnace wall is less than 45 ° C, so as to achieve energy-saving effect, which is 10% energy-saving than congeneric products;

3. Optimize the program design to ensure the high reliability of equipment operation and improve the utilization rate of equipment.

4. A preheating area is installed at the front end of the furnace, and a heat exchange fan is installed at the top of the preheating area. First, heat exchange with the fed cold workpiece, and then preheat the air to reduce the air consumption of the furnace.

5. A water-cooled gas production chamber is installed at the back end of the furnace. This device reduces the temperature of the workpiece and makes the workpiece quickly cool to about 300 ° C at 650 ° C.