Automated control system for managing multiple energy sources

摘要

An automated control system for a dual-fuel boiler, engine, or other apparatus continuously monitors the consumption of a primary fuel source and automatically switches from the primary fuel source to a secondary fuel source when a predetermined amount of the primary fuel is used in a measured time period, the object of the system being to automatically maintain a 100% load factor of the primary fuel source. A meter continuously monitors consumption of the primary fuel and outputs an electronic flow signal representing consumption of primary fuel. The flow signal is received by a programmable logic controller having a real- time clock whereby consumption of the primary fuel is measured against time. Remote control actuated ball valves mounted in the primary and secondary fuel lines selectively control the flow of primary and secondary fuels to the dual-fuel apparatus. The programmable logic controller is programmed with a measured time period, and a 100% load limit of fuel consumed during the given time period. The programmable logic controller sums the flow signal over the measured time period and automatically controls switches from the primary fuel to the secondary fuel when the 100% load limit is achieved. When the measured time period expires, the logic controller reverts the system back to the primary fuel and starts the measured time period over.