AG Processing CFB Boiler

AG Processing Inc.
Hastings, Nebraska

Plant Owner
AG Processing Inc.

Location
Hastings, Nebraska

Contract Order: 2006

Commercial Operation: 2009

B&W Scope

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
Instrumentation
Technical advisory services during startup and commissioning

Boiler Specifications

Environmental Equipment

Project/Boiler Facts

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