An air preheater is used to preheat the fuel which further increases the boiler efficiency. It is designed to heat air before another process by extracting the waste heat from the flue gases leaving the boiler to effectively reduce the flue gas temperature and improve the thermal efficiency.
Heat treatment is an essential part of the manufacturing process, involving heating a metal or alloy to a specific temperature and then cooling it to harden the material. In the manufacturing process of boilers, the following pressure components require post-weld heat treatment: alloy steel pressure components and carbon steel pressure components which include butt joints with wall thickness greater than 30mm, the cylinders of internal combustion boilers, and T-joints with tube sheet wall thickness greater than 20mm. As a professional industrial boiler manufacturer, ZOZEN Boiler always strictly follows the boiler safety technical specifications to conduct heat treatment on specified boiler components, which effectively reduces the residual stresses in the material that have been introduced by welding and improves the boiler performance.
ZOZEN Boiler has an advanced membrane wall production line, and the membrane wall tube arrangement is an important working procedure after the membrane wall is put into production. After the membrane wall is welded, it will be made into various shapes by the draw bench machine.
ZOZEN WNS oil-fired and gas-fired boiler is one of the best-selling series of energy-saving and environmental protection boilers in China. The inside of the boiler consists of large diameter corrugated boiler, threaded smoke tube, and other boiler components.
The large-scale fiber laser cutting machine being developed by ZOZEN Boiler is similar to the existing plasma cutting machine, and has the characteristics of high precision, good repeatability, numerical control programming and so on. Besides, it has the advantages of faster processing speed and higher precision. The accuracy of cutting steel plates can be controlled within 1 mm, which effectively improves the welding and assembly quality of boilers.
Automation and digital equipment are widely used in boiler production in ZOZEN Boiler Modern Production Base, which can reduce manual errors and improve the quality of boiler production. Automatic welding technology in boiler drum and steel pipe is used for welding. Welding current, welding voltage, wire feeding speed and walking speed are all fixed parameters, which greatly reduces the influence of human factors on boiler quality and ensure the welding quality.
In the drum working area of ZOZEN Boiler, the rolled steel plates will be welded here. Before welding, the plates will be treated to remove the rust on the surface.
ZOZEN boiler covers an area of 150 thousand square meters, with an annual production capacity of 2000 industrial boilers and 25000 tons of steam. ZOZEN has built six fully automatic lines for the production of convection pipe, coil pipe, threaded pipe, membrane wall, serpentine tube and header.
