Design & Operation of Circulating Fluidized Bed Boilers (CFB)

This training course is primarily intended for experienced O&M staff working in thermal power and process plants but could also be of interest to corporate engineering and management staff seeking to understand CFB technology.  

The course provides an in-depth survey of all the important design features and basic operational aspects of CFB boilers.  Selected fundamental topics such as fluidization, heat transfer and boiler efficiency that are of particular importance for the operation and performance of such boilers are treated in considerable depth.  

Course instructor is Prof. Bo Leckner from Chalmers University of Technology, Sweden.

About the instructor: Prof. Leckner has been a researcher within the field of thermal energy conversion with application to boilers and gasifiers, especially fluidized bed for over 50 years. He has published over 460 papers.

Course Syllabus

GENERAL OVERVIEW

• History of development of CFB and FB
• Types of CFB and their characteristics

KEY ASPECTS OF FLUIDIZATION

• Voidage, particle size, minimum fluidization velocity, transport velocity and other basic concepts
  

FUEL PROPERTIES AND THEIR SIGNIFICANCE FOR OPERATION AND PERFORMANCE

• Coal, biomass, and waste
  

OVERALL THERMAL DESIGN

• Heat balance, heat transfer and allocation of heat transfer surfaces, Influence of fuel, co-combustion

KEY DESIGN FACTORS

• Bed, Furnace, Cyclone, Loop Seal
• Fuel feed system and location
• External heat exchangers ​Heat balance, heat transfer and allocation of heat transfer surfaces, Influence of fuel, co-combustion

BED INVENTORY AND PSD MANAGEMENT

• Pressure drop, and Pressure measurements, circulation loop

ASH SYSTEMS AND MANAGEMENT

• Bottom ash, fly ash, ash cooling, recycling
  

BED AGGLOMERATION AND DEPOSITS ON HEAT TRANSFER SURFACE

CONTROL ASPECTS

• Bed material control, Bed temperature control
  

AIR EMISSIONS

• Type of emissions and how they are influenced, CO, NO, SO2 etc.
  

PART LOAD AND TRANSIENT OPERATION

PERFORMANCE, TROUBLESHOOTING

QUESTION & ANSWER, DISCUSSION