By Allen Houtz1 and Doug Cooper We explored override control using select elements in a previous article and learned that environmental and energy efficiency concerns for metered-air combustion processes can be partially addressed with a single select override element. Examples illustrated how a select override can either prevent having too much fuel or too much […]
By Allen Houtz1 and Doug Cooper A select element receives two input signals and forwards one of them onward in the signal path. A low select, shown below to the left, passes the lowest of the two signals, while ahigh select, shown to the right, passes the larger value onward.
By Allen Houtz1 and Doug Cooper A ratio control strategy can play a fundamental role in the safe and profitable operation of fired heaters, boilers, furnaces and similar fuel burning processes. This is because the air-to-fuel ratio in the combustion zone of these processes directly impacts fuel combustion efficiency and environmental emissions.