Retrofit, Conversion from Solid to Gas Fuel for Circulating Fluidised Bed Utility Boiler

Power-Gen Europe, 2017

Overview:

• Circulating Fluidised Bed (CFB) Utility Boiler
• 550 tph steam at 127 barg and 541°C
• Operating on solid fuel for 1.5 years
• Full conversion from Petroleum Coke (Pet Coke)
• Meet NO_x requirements and capacity
• Minimal or no impact on waterside

Options 

• Replace 4 Start-Up burners with new burners
• Add second elevation of burners
• ~80% of equipment remained available for future pet coke firing
• Complete redesign of combustion air system
• Integration of new redundant BMS and controls logic
• New gas fuel skids
• Refractory removal
• Structural support modifications for new equipment

Results

• Unit re-commissioned in less than two weeks
• <100 mg/Nm3 NO_x emissions
• 550 tph production achieved
• Sister unit conversion the following year (2014)

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