A coating production line generally needs to be equipped with two drying tunnels, one for drying the moisture of the workpiece after the pre-treatment process; the other for drying and curing the surface of the workpiece after spraying. After the pre-treatment steps, the workpiece enters the drying tunnel. The main function of the pre-treatment tunnel is to dry the moisture on the surface of the workpiece to prepare for the next step of spraying. After the workpiece is powder sprayed or paint sprayed, it needs to enter another drying tunnel for heating to cure the material sprayed on the surface of the workpiece. According to the civil engineering installation layout, the drying tunnel can be divided into floor-standing type and full-bridge type, and the heating energy of the drying tunnel can be divided into natural gas, fuel oil, electricity, bio-particles, etc. The drying tunnel needs to be equipped with a burner. At present, Fuyuan uses natural gas burners of domestic brands, the Italian-Chinese joint venture Rialu brand, and American McKesson burners. It needs to be purchased and configured according to customer needs and standards.