What is the Difference Between AFBC and CFBC Boiler
It is reported that circulating fluidized bed boilers are more an more appeared in industries and commercial fields. Someone consult for AFBC boiler, while some search for CFBC boiler. And they are usually confused: are the two the same or what’s the difference between AFBC and CFBC?
In brief, AFBC means Atmospheric Classic Fluidized Bed Combustion (AFBC); CFBC means Atmospheric Circulating Fluidized Bed Combustion (CFBC). Here let’s know their differences from these aspects: velocity, heat transfer surface, requirement on size of coal, combustion air supply, and so on.
1.Velocity:
AFBC = 1.2 m/sec to 3.7 m/sec
CFBC = 3.7 m/sec to 9 m/sec
2.Heat Transfer Surface:
AFBC = Heat is extracted within the the bed
CFBC = Heat transfer occer outside of combustion zone i-e Convection section, water walls and at the exit of the riser
3. Size of Coal
AFBC : 6-10 mm
CFBC : 6- 12 mm
4. Combustion Air Supply
AFBC : 3 - 5 psig
CFBC : 1.5 - 2 psig
Advantages of CFBC over AFBC
CFBC technology evolves from AFBC to overcome some of the Problems of AFBC
a). Better Space utilization for large Industrial units
b). Efficient combustion
c). Better SO2 capture
d). Better Techniques for Nox Control
e). Better temperature Control
f). More economical for Industrial application requiring steam demand more than 100 Tons/hr
g). Better for low garde Fuel with Low calorific value and high Ash content
h). Reduced Erosion of heat transfer surface in combustion chamber as surface is parallel to the flow contrary to AFBC
Zhengzhou Boiler Group (ZBG) is a leading boiler manufacturer, supplier and exporter in China. For 70 years we are always committed to innovating and developing better boiler products. In 1992, we cooperated with Tsinghua University began the innovation of Circulating Fluidized Bed Boiler, by now we have made great progress in CFBC boilers and last year our 116MW CFB hot water boiler was listed as the NO1 in a high efficient and environmentally friendly boiler promotion list with the efficiency of 91.98%!
