LINKAGE-LESS
Boilers are more efficient and thus less costly to operate when the burner runs as well as it can. Several firms have developed microprocessor controlled burners that utilize servomotors to position vales and dampers. 

New Linkage-less burner systems remove mechanical linkages and mod-motors and replace them with servomotors and microprocessors. With these systems, many more points of O2, CO2, and CO are measured and stored in a control which “memorizes” the position the of servo-motors at maximum efficiency across the firing rate. The positions and therefore the efficiency is infinitely repeatable and removes the guess work of setting the mechanical linkages.

Energy saving estimates can be made by making reasonable assumptions about how long and at what efficiency the burner was running at various loads. More accurate estimates can be made by utilizing energy savings software available from linkage-less
burner control manufacturers.

LINKAGE-LESS BURNER EXAMPLE
Figures A and B below show a burner before and after being retrofitted with a linkeage-less system.

In the example, the actuators and linkage is gone, replaced with independent servomotors.
There is no hysteresis so no compromise in set up and there is no mid-range efficiency problem since there are many points in the “fuel curve.” The positions of the valve and damper servo motor are saved in a controller resulting in efficiencies which are infinitely repeatable.

Considerable fuel savings in the 5 to 15% range can be expected for Linkage-less burner systems. As fuel costs increase and pressure mounts for reducing combustion emissions, customers are looking at linkage-less systems as an Energy Conservation Measure.

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