Gravimetric feeder F55

manualPLC-controlledcoal powder

Saimo F55 Pressure-resistant Gravimetric Coal Feeder is specially designed to continuously feed specific amount of coal into large electrical utility and industrial boiler. Precision and reliability are achieved by merging Saimo latest in-motion weighing technology and the specially designed digital controller. It is widely used for fuel control, inventory monitoring and reporting for all kinds of pressurized boiler applications in power plant, chemical industry and coal mine. Theory of Operation For typical coal powder boiler applications, the coal feeder is usually mounted under the bunker to continuously deliver the specified coal flow into the pressurized mill. The coal feeder is connected to the bunker via an inlet chute to allow positive coal loading on the belt of the coal feeder. The two high precision strain gauge load cells positioned under the weighbridge provide real-time coal weight as the belt loading passes through the weigh area. Belt speed is continually measured with a digital speed sensor whose pulse output is proportional to belt speed. The speed sensor is mounted on the tail-pulley to assure accurate belt speed measurement and detection of any possible slippage. The speed signal and weight signal are combined in the microprocessor-based integrator totalizer which generates and displays a true-rate signal in TPH and the total of material fed. A controller compares the rate signal to the setup feed rate (set from a host computer, PLC or by manual command) and generates the necessary output signal to the frequency converter by means of PID regulation, changing the feeder’s belt speed to maintain the desired constant rate of material fed.