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Circulating Fluidized Bed (CFB) Boilers

Typical fuels: Biomass, Petroleum Coke, Lignite, Coal, Tire Derived Fuel (TDF), Plastics, Waste Paper, Sludge, Fuel Oil

Fluidized Sorbent/Fuel Mixture

Challenge:  CFB Boilers have emerged as a preferred technology for cost effective steam generation due to their ability to utilize a variety of lower cost fuels while managing emissions.  Biomass, low-grade coal, and waste fuels such as TDF can be effectively burned in a CFB unit.  At the same time, these low cost and waste fuels carry with them a great deal of variability that can lead to difficulty in operations.  Steaming rate control and response to load swings can be a challenge, and managing bed temperature, which is critical to emissions management, can be problematic.  In addition, instability leads to loss of thermal efficiency and excessive use of sorbent materials such as limestone. 

Solution:  A CFB Boiler can be a reliable, responsive, and low cost steam producer for an industrial site while meeting emissions constraints.  To achieve this it is important to have highly functioning instrumentation and control technology that automates operation, adjusts for fuel variability in real-time, and simultaneously manages all mechanical and emissions constraints.  Emerson helps CFB Boiler owners achieve lower steam production costs by mitigating process issues, ensuring that proper measurement and actuation devices are in place, and implementing a firing strategy that responds to changing fuel conditions in real-time.  Emerson’s SmartProcess® Boiler solution provides Btu based combustion control that reduces the effects of fuel variability in order to deliver higher steaming rates and better thermal efficiency within process and permit limits. 

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