What is a PFBC explain its operation?
The PFBC burns the char to produce steam and to heat combustion air for the gas turbine. The fuel gas from the carbonizer burns in a topping combustor linked to a gas turbine, heating the gases to the combustion turbine’s rated firing temperature.
What is the combustion efficiency of PFBC boilers?
Because of the small particle size and recycling of solids back to the combustor, the CFBC boiler is able to achieve a combustion efficiency over 98% and a Ca/S ratio of 2.5 for 90% sulfur capture (Figure 5.11). The fuel-feed size in this boiler can be as low as 1.5 mm to 10 mm top size.
Which are the types of FBC boiler?
1. Atmospheric classic Fluidised Bed Combustion System (AFBC) 2. Atmospheric circulating (fast) Fluidised Bed Combustion system(CFBC) 3. Pressurised Fluidised Bed Combustion System (PFBC).
What is FBC in boiler?
Fluidized-bed combustion (FBC) uses a mixture of particles suspended in an upward flowing airstream, which combine to exhibit fluid-like properties. Combustion takes place in the bed with very intense mixing of gases and solids, high heat transfer to the furnace, and a low combustion temperature.
What is the principle of FBC?
“Fluidized bed combustion (FBC) is a combustion technology used to burn solid fuels.” A bed of solid particles is said to be fluidized when the pressurized fluid (liquid or gas) is passed through the medium and causes the solid particles to behave like a fluid under certain conditions.
What is difference between Afbc and CFBC boiler?
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.
What are the functions of a PFBC boiler?
All the functions of the PFBC boiler worked as planned, including the in- furnace desulfurization, non-catalytic denitrification (injection of an ammonia gas into the hot gas pipe at the furnace outlet), dust removal by two series of two- stage multicyclones, etc.
What are the general and preventive maintenance of boiler?
General and Preventive Maintenance:- The Performance of a Boiler depends on maintenance carried out. The boiler, water pipelines, strainers, etc should be kept clean to maintain water flow to boiler. The types of maintenance are General, Daily, Weekly, Monthly, Quarterly, Half-yearly and Yearly.
What is a package boiler?
Package boilers are generally of shell type with fire tube design so as to achieve high heat transfer rates by both radiation and convection Figure 7: Packaged Boiler 2.
What is the efficiency of boiler?
IMPROVING THE EFFECIENCY OF BOILER Efficiency of Boiler :- Thermal efficiency of boiler is defined as the percentage of heat input that is effectively utilized to generate steam. There are two methods of assessing boiler efficiency. 1.