AERG has designed and installed several fully automated demand-based biogas-natural gas fuel blending system to supply fuel to the boilers.  With this cost effective fuel blending system, the biogas and natural gas are blended together at a defined ratio before being utilized in the boiler.  Instead of converting the boiler to utilize biogas with a new fuel train for the biogas, the existing fuel train will be retrofitted with redundant safety valves, flow control valves, and intake air controls.  In addition, an oxygen sensor is installed in the exhaust stack of the boiler and an auto-trip option to control the air fuel ratio enable the boiler to operate more efficiently.

Our blending control system can handle a wide range of biogas / natural gas mixture ratios supplied to the boiler.  This simple cost effective system eliminates the need for an alternate biogas fuel train for the boiler.  A custom-built programmable logistic controller (PLC) controls the entire system and provides a fuel modulation based on biogas availability and steam demand.  In addition, the boiler will automatically switch over to natural gas if there is not sufficient biogas available or due to a biogas system shutdown.  The system operating variables and performance data are stored in the PLC for future reference.