Based on exposured geologic phenomenon of Yamansu iron deposit in Xinjiang after being explored for many years, this paper refutes the existing viewpoints on its origin, devises new argumentation from many aspects that accords further with its nature, and raises an idea that the deposit is a volcanic extrusion-overflow melted- separate deposit on seabed.

In view of troublesome problems influencing upon the safety of 125MW units with hot air for sending pulverized coal and allocation of the primary air,such as fire-carrying in the primary jet orifice,and slagging on the water-wall in zone of burners etc,occurred after enhancement of volatile and heat value in the coal.