Pulverized coal preheating and conveying system for rotary cement kiln

The utility model provides a pulverized coal preheating and conveying system for a rotary cement kiln. The pulverized coal preheating and conveying system for the rotary cement kiln comprises a pulverized coal bunker, a pulverized coal metering scale, a coal-injection duct and a Roots blower; the feed opening of the pulverized coal bunker is in pipe connection with the coal-injection duct through the pulverized coal metering scale; the discharge hole of the coal-injection duct is arranged in the rotary cement kiln; the air outlet of the Roots blower is connected with the coal-injection duct through an air hose; the pulverized coal preheating and conveying system for the rotary cement kiln is characterized by also comprising a centrifugal blower, an interference-type separator and a rotary kiln grate cooler; the centrifugal blower is a high temperature-resistant high-pressure centrifugal blower; a hot-air room of the rotary kiln grate cooler is in pipe connection with the air inlet of the centrifugal blower through the interference-type separator; the air outlet of the centrifugal blower is in pipe connection with the coal-injection duct. According to the pulverized coal preheating and conveying system provided by the utility model, the combustion velocity and the flame temperature of pulverized coal in the rotary cement kiln can be effectively increased, the use ratio of fuel heat is increased, and the discharge capacity is reduced.