1. Vertical double return structure

The vertical fuel gas steam boiler adopts the lower burner mode, two-pass structure, full fuel combustion, and stable boiler operation; spoilers are inserted in the flue pipe to slow down the exhaust gas speed, increase the heat exchange, and the boiler has high thermal efficiency and reduces user usage cost.

2. Horizontal three-return structure

The horizontal steam boiler is a shell-type full-wet back-flow three-pass pyrotechnic tube structure. The flame burns in a large combustion chamber with slight positive pressure, fully extended, low combustion heat load, high combustion heat efficiency, and effectively reduces the exhaust gas temperature and saves energy Reduce consumption and use economical. The structure of the corrugated furnace bladder and the threaded smoke tube not only improves the heat absorption strength of the boiler, but also meets the needs of thermal expansion of the heat exchange surface, which is scientific and reasonable and durable.