What is an CFBC boiler?
What is an CFBC boiler?
The boiler in which coal is burnt in an environment of high concentration of bed material (mineral matter) derived from combustion of coal retained by using cyclone / other means. This bed material is fluidized by primary air (a part of combustion air).
What is the difference between Afbc and CFBC boiler?
AFBC means atmospheric fluidized bed combustion, where the furnace pressure is atmospheric pressure. CFBC boiler stands for circulating fluidized bed combustion boiler, the furnace is pressurised and the furnace gas is recirculated to capture the unburnt carbon, to increase the thermal efficiency of the boiler.
Is CFBC cost effective?
The CFBC boiler is used in number of units around 250–300 MW in size. Thus, the thermal efficiency of a CFBC boiler is 3–4% lower than an equivalent-size pulverized coal-fired boiler.
What are the major performance features of the CFBC boiler?
The major performance features of the CFBC boiler (circulating fluidizing bed combustion boiler) are: a) It has a high processing capacity because of the high gas velocity through the system.
How does a CFBC boiler work?
Fine particles of partly burned coal, ash and bed material are carried along with the flue gases to the upper areas of the furnace and then into a cyclone. Hence the name Circulating Fluidized Bed combustion. The hot gases from the cyclone pass to the heat transfer surfaces and go out of the boiler.
Why bed material is used in boiler?
Fluidized bed combustion (FBC) is a combustion technology used to burn solid fuels. Limestone is used to precipitate out sulfate during combustion, which also allows more efficient heat transfer from the boiler to the apparatus used to capture the heat energy (usually water tubes).
What type of boiler is a LaMont boiler?
A LaMont boiler is a type of forced circulation water-tube boiler in which the boiler water is circulated through an external pump through long closely spaced tubes of small diameter. The mechanical pump is employed in order to have an adequate and positive circulation in steam and hot water boilers.
What is the major disadvantage of the Benson boilers?
Explanation: The major disadvantage of the Benson boiler is that when water transforms into steam in the convective section of the evaporator, salts are deposited in the transformation zone. Hence periodic flashing of evaporator tubes in the convective section is necessary.
What is the most important part of a boiler?
The safety valve is the most important safety device in a boiler or domestic hot-water system. It is designed to relieve internal pressure if a range of failures occur within the system.
What is TPH in boiler?
TPH =Tonnes per hour. PA. =Primary Air. Power Consumption from PA Fans (kW) for.
Why clinker is formed in boiler?
Strong bonded deposits called clinkers are formed when ash deposit fuses to the furnace walls and tubes of a boiler. Due to strong bonding with the furnace walls, traditional sootblower implemented for the removal of ash deposits are ineffective for the removal of clinkers.
What is main disadvantage of Lamont boiler?
Disadvantages of Lamont Boiler: The main disadvantages are Bubble formation on a surface of the tube reduces the heat transfer rate. For this reason a little problem with the total amount of steam generation.
What’s the difference between a CFBC and an AFBC boiler?
AFBC (Atmospheric Fluidized Bed Combustion) : Comparatively lesser residence time, turbulence and lower combustion efficiency and lower desulfurization. CFBC (Circulating Fluidized Bed Combustion) : higher residence time, turbulence and combustion efficiency.
What makes ZG CFBC different from other CFBC boilers?
ZG CFBC boilers are capable of burning a wide range of fuels allowing for less expensive fuel preparation and thus a reduction in costs.The solid fuel-fired CFBC boilers use internal recVirculation with two-stage solid separation system in capacities up to 680t/hr. CFBC technology evolves from AFBC to overcome some of the Problems of AFBC. d).
Why is CFBC ash recirculated in a furnace?
Note : The main reason to develop this type of combustion is to limit the emission of hazardous gases like SOx and NOx which are generated at higher bed temperatures. Source : a book on boilers for power and processes. Both are fluidized bed combustion but in cfbc ash is recirculated in furnace thereby either cooling temperature or increasing.
Which is better for Indian coal CFBC or AFBC?
Cfbc is particularly suitable for Indian coal which has high percentage of ash. Due to ash recirculation unburnt carbon percentage in exhaust gases can be reduced considerably. ServiceTitan® is built to help grow your HVAC business. ServiceTitan’s comprehensive system helps tradespeople meet their business objectives.