How to advance your boiler control system? (Energy Efficiency Tip of the Day)
Tip summary
• Mainly there are three areas to improve control in boilers. Steam side* water side and firing side.
• For the burners* an alternative to complex linkage designs* modern burners are increasingly using servomotors with parallel positioning to independently control the quantities of fuel and air delivered to the burner head.
• Controls without linkages allow for easy tune-ups and minor adjustments* while eliminating hysteresis* or lack of retraceability* and provide accurate point-to-point control.
• These controls provide consistent performance and repeatability as the burner adjusts to different firing rates. Variable frequency drives (VFDs) can also be used to more accurately control the air supply.
• Other technologies included in combustion controls are metered control* cross limited control and oxygen and carbon monoxide trim controls.
• From the water side steam drum water level control and automatic blow down based on conductivity is the two opportunities.
• Advanced boiler controls are generally one of the first energy-efficiency measures a facility will implement to improve boiler energy efficiency.
Proposed actions
o Review your current control system
o Determine the areas to implement advanced process control (APC) and the expected savings.
o Evaluate the economics of the required changes.

Economics
o System retrofit will have low to medium cost but quick ROI.

Savings
o Estimated energy savings range: 3% of boiler energy use.

Conclusion
o Advanced boiler controls: savings of 3% of boiler energy use.
o Please share this tip with others to share knowledge and increase energy efficiency awareness.
o Please contact me for any advice or support about this issue or other energy management issues.
Tip video

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