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Bear Island Fluidized Bed Energy
Recovery System
Project Description Deinked sludge, dewatered to 30% solids by a belt filter press, is conveyed to a rotary dryer where moisture is evaporated by contact with exhaust gas from the fluid bed. After going through the dryer, the 35-55% moisture sludge is disengaged from the exhaust gas by cyclones and conveyed to the metering bin for feed into the fluid bed. The plant does not require auxiliary support fuel for the sludge to burn in the fluidized bed cleanly and efficiently. Although not required, the system can accommodate ammonia injection to control NOx emissions. The fluid bed exhaust gas passes through an EPI cyclone boiler where the energy is recovered and particulate is removed. Steam at 15 psig is generated in the cyclone for mill use. The flue gas is mixed in a blend chamber, with gas recirculated from the venturi scrubber, to achieve the desired dryer inlet temperature. After passing through the dryer and fuel separation cyclones, flue gas is further cleaned and cooled by a quench/scrubber arrangement, which uses recycled water from the ash slurry system. Loop controllers provide process temperature and flow control, and are interfaced into the mill's existing PLC. In addition to process design and equipment supply, EPI provided permitting support for the project, as well as fabrication, installation supervision, startup, commissioning and training services. Scope of Supply The scope of supply was from metering bin discharge to the cyclone outlet. EPI also provided permitting support for the project installation supervision, startup, commissioning and training services.
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Energy Products of Idaho
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