HCE blow-down positive pressure dense phase limestonr transmitter is the main equipment for positive pressure air and force transfer system of coarse particle, medium specific weight powder. It uses compressed air as transfer force, and automatically control of lower electrical feeder and conveying pressure, conveys dry, coarse, and medium specific weight materials continuously. It has been widely applied in limestone conveyance and injection system for fluidized bed and coal-burn only boiler power plants.