How does a CFBC boiler work?
At adequately high airspeed, the bed acts as a fluid resulting in rapid mixing of the particles. The fluidised action promotes complete coal combustion at relatively low temperatures and provides a means to transfer combustion heat efficiently from the bed to the steam tubes.
What is CFBC power plant?
Circulating Fluidized Bed Combustion(CFBC) Boiler is an environment-friendly power facility to reduce the discharge of pollutants such as nitrogen oxide and sulfur oxide by injecting air and lime at the same time for burning.
What is CFBC boiler details?
The CFBC boiler is used in number of units around 250–300 MW in size. In a CFBC unit, heat losses from the cyclone(s) are considerable. 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.
What does CFBC stand for?
|CFBC||Circulating Fluidized Bed Combustion|
|CFBC||Childfree by Choice|
|CFBC||Champion Forest Baptist Church (Houston, TX)|
|CFBC||Cross Florida Barge Canal|
What is the difference between CFBC and Afbc 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.
What is the difference between Afbc and CFBC boiler?
CFBC boilers are said to achieve better calcium to sulphur utilisation – 1.5 to 1 vs. 3.2 to 1 for the AFBC boilers, although the furnace temperatures are almost the same. CFBC boilers are generally claimed to be more economical than AFBC boilers for industrial application requiring more than 75 – 100 T/hr of steam.
What are the advantages of fluidized-bed combustion?
Advantages and Dis-advantages of Fluidized Bed Combustion High thermal efficiency. Easy ash removal system, to be transferred for made cement. Short commissioning and erection period. Fully automated and thus ensures safe operation, even at extreme temperatures.
Who is CFBC?
About CFBC – Clarence Fitzroy Bryant College. Established in 1988, the then College of Further Education was mandated to consolidate and augment the opportunities for tertiary level education in the Federation of St. Kitts and Nevis.
What is full form of Afbc boiler?
1. Atmospheric classic Fluidised Bed Combustion System (AFBC) 2.
Why it is called Afbc boiler?
Atmospheric Fluidized Bed Combustion System (AFBC) Atmospheric Fluidized bed combustion boilers are most common and simple FBC boiler where combustion takes place at layer of sand or sand like material. Bubbling of sand bed is created with the help of fluidizing air of velocity 1.2-3.7 m/sec.
How does a fluidized bed work?
Typically, pressurized gas or liquid enters the fluidised bed vessel through numerous holes via a plate known as a distributor plate, located at the bottom of the fluidised bed. The fluid flows upward through the bed, causing the solid particles to be suspended.
What is DP plate in boiler?
8-What do you mean by DP test in AFBC Boilers? It is the test carried out before the light up of Boiler to ensure the healthiness of air nozzle & bed plate.
Why are fluidised beds used?
In fluidised beds, the contact of the solid particles with the fluidisation medium (a gas or a liquid) is greatly enhanced when compared to packed beds. This behavior in fluidised combustion beds enables good thermal transport inside the system and good heat transfer between the bed and its container.
What is the main advantage of a fluidized bed boiler?
One of the major benefits of FBC is that it facilitates the combustion of many unconventional fuels that would not be otherwise possible. In addition, it allows very low emission of NOx and SO2.
What is the capacity of PFBC boilers?
The capacity of PFBC boilers is lower than that of CFBC boilers. The world’s largest PFBC boiler with capacity 360 MW e is currently operated in the Karita Plant in Japan and uses ABB Carbon P800 technology.
What is the difference between CFBC and BFBC technology?
While CFBC technology has several advantages over BFBC technology, there are also some areas of concern or disadvantages: Greater pressure drop across the CFBC boiler, resulting in increased fan power requirements High cyclone efficiencies are required for bed material recovery for solids recycle
What are the advantages of PFBC over BFBC?
Another advantage of PFBC is reduced boiler size. The high gas density results in a smaller required bed plan area. The lower velocity reduces the total height required for the bed and freeboard [ 25 ]. CFBC technology has a number of advantages over BFBC technology, including ( Wu, 2003) the following: