The utility model provides a belly
pipe with a pulverized
coal burning function, which comprises a premix burner and a burner. The premix burner and the burner are connected through a
flange; hot-blast air and pulverized
coal simultaneously enter from the inlet of the premix burner; an internal channel in the premix burner is of a reducing
pipe structure; the
diameter of the outlet of the premix burner is less than that of the inlet of the premix burner and is equal to that of the inlet of the burner; a suddenly expanding
combustion chamber is arranged in the burner; the inner
diameter of the
combustion chamber is greater than the
diameter of the inlet of the burner, whereas the outlet section of the burner is also of a reducing
pipe structure; and the diameter of the outlet of the burner is less than the inner diameter of the
combustion chamber and is also less than the diameter of the inlet of an air inlet. Due to the fact that the pulverized
coal starts to be injected into the hot-blast air nearby the inlet of the premix burner, equivalently the existing pulverized coal injected into a
blast furnace is injected into the
blast furnace again after being burnt outside the furnace, thus, the burning rate of the injected pulverized coal is greatly improved and the burning amount of the pulverized coal in the hot-blast air is increased, thereby the amount of the injected pulverized coal which can be accepted by the
blast furnace is obviously increased. At the same time, partially burnt pulverized coal causes the volume and the temperature of
combustion products to be increased sharply and the blast
kinetic energy is also obviously improved, and therefore, the beneficial effect of improving the work of a blast furnace
hearth is brought.