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Multi-Fuel Boilers

Typical fuels: Natural Gas, Fuel Oil, Pulverized Coal, Hydrogen, Biogas, NCGs, Coke Oven Gas, Blast Furnace Gas, Waste Liquids, Waste Gases

Multiple Burners and/or Fuel Guns

Challenge: Multi-fuel boilers typically burn a mixture of waste or alternate fuels along with natural gas, fuel oil, and/or pulverized coal.  This provides an opportunity to produce steam at lower cost than a basic fossil fuel fired unit, but it also makes operations more challenging.  Waste and alternate fuels vary in Btu content per volume and their supply is often not consistent.  This significantly affects combustion stability and the ability to reliably meet load.  More expensive fossil fuels must be used when waste and alternate fuel is not available or to make up for low Btu.   Managing this without excessive cost is difficult.  In addition, operating within emissions constraints may be a problem with multiple fuel streams in the mix.

Solution: The percentage of steam made with low cost fuels in a multi-fuel boiler can be raised while still achieving needed performance.   To accomplish this, control functionality must be present to prioritize the lowest cost fuels and control combustion in real time on a Btu basis.  This allows fuel costs to be reduced and thermal efficiency to be increased while still meeting demand swings and running within constraints.  Emerson helps multi-fuel boiler owners achieve lower steam production costs by mitigating process issues, ensuring that proper measurement and actuation devices are in place, and implementing a Btu based control strategy that responds in real time to changes in fuel properties and availability while managing all constraints.  Emerson’s SmartProcess® Boiler solution maximizes low cost and alternate fuel use and improves thermal efficiency to lower overall fuel costs while maintaining unit responsiveness.

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