Feed pumps variable frequency drives

Special consideration is required for heavy loads such as crushers, high capacity electric furnaces, big pumps, or blowers which may cause flucmations in the incoming supply grid and disturb other nearby industries or power consumers. Hence, arrangements must be provided in the equipments to start on a minimum load and then slowly increase the load. Some of the methods for this could be provision of variable-frequency drive motors, throttling inlel/exit valves, controlled feed rates of solid lumps to crushing machines, etc. 

Check feed rates of fuel pumps, current drawn by the drive motors, setting on the variable frequency drive if provided. Use gear pumps for fuel oil as far as possible. 

Excess feed can happen with centrifugal pumps hence provide variable-frequency drive motor and low/high SO2 % alarms for gas composition and furnace exit gas temperature f it is not possible to provide metering pumps. 

Feed tank and metering pump the flow rate through such a pump can be controlled by a stroke adjusting mechanism or a variable speed drive acting on the stoke frequency. Control can be achieved by a fixed adjustment or through a flow meter. 

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