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One common application of cascade control combined with feed forward control is in level control systems for boiler steam drums. (click for large view), most boilers of medium to high pressure today use a "3-element" boiler control strategy. The term "3 thatChat Online
The three-element mode is used during high steam demand. The two-element mode is used if the steam flow measurement fails and the module falls back to single element level control if the feedwater flow measurement should fail or if there is a low steamChat Online
Tubes that are not producing significant steam flow have a net downward flow of boiler water from the steam drum to the mud drum. The basic three-element control system we have previously discussed in the article Cascade, Feed Forward and Boiler LevelChat Online