AG Processing Case Study
AG Processing CFB Boiler
AG Processing Inc.
AG Processing Inc.
Contract Order: 2006
Commercial Operation: 2009
Coal-fired internal recirculation circulating fluidized-bed (IR-CFB) boiler from outlet of coal bunkers to outlet of tubular air heater including:
- FD fan and motor
- Tubular air heater
- Steam coil air heater
- Multi-cyclone dust collector
- Ash recycle/reinjection system
- Limestone injection system
- Coal feeding system
- Start-up burners
- Refractory lined lower furnace with erosion protection at the Reduced Diameter Zone (RDZ) transition
- Segmented U-beam primary particle collectors with watercooled support system
- Bed drain screw coolers
- Bed drain solids conditioning equipment including a screener and crusher
- Sootblower boiler cleaning system.
- Attemperator and spray water control station
- Flues and ducts
- Ammonia forwarding, control and injection system
- Technical advisory services during startup and commissioning
- Boiler type: Internal recirculation CFB design
- Design fuel: Powder River Basin coal
- Startup fuel: Natural gas
- Steam flow: 311,000 lb/h (37.8 kg/s)
- Steam pressure: 150 psig (1034 kPa)
- Steam temperature: 440F (227C)
- Low pressure and temperature steam from the boiler is supplied primarily for soy bean processing.
- The addition of limestone to the circulating bed reduces SO2 emissions from the boiler.
- Low furnace temperatures, staged combustion and SNCR system limit NOx emissions.
- Unique two-stage solids collection system using U-beams and multi-cyclone dust collector (MDC) provides superior collection efficiency. The recycling of solids collected by the MDC improves combustion efficiency and limestone utilization.
- The U-beam and MDC solids collection system requires significantly less maintenance than hot cyclones.
- A patented RDZ design with silicon carbide tiles at the top edge of the furnace refractory is used to minimize tube erosion at the interface
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Sectional Sideview of the AG Processing CFB boiler.