We use the wet - back and waveform furnace pipe structure, and the center of the heating surface is symmetrically arranged so that the boiler stress and expansion are more reasonable to effectively reduce the thermal stress and improve the safety and service life. The reasonable heating surface can ensure good water circulation and heat exchange to achieve the best heat - transfer effect and improve the thermal efficiency. The originally imported burner and the advanced automatic control system can ensure more stable combustion, more convenient operation and more safe and reliable running.