How does a fluidized bed combustion system work?
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.
How does a CFB work?
The boiler activates a mixture of particles and gas to improve combustion reaction. Moreover, the fluid sand and fuel issuing out of the furnace are collected in a cyclone and recirculated into the furnace again, thereby improving combustion efficiency.
What is CFBC technology?
It is the boiler that uses a specific technology called ‘Circulating Fluidized Bed Combustion (CFBC)’. The high concentration of bed material along with staged air supply ensures that bulk combustion temperatures do not exceed 950°C making it environment friendly (lesser production of NOx) means of utilizing coal.
What does fluidized bed combustion remove?
Of all fossil fuels , coal exists in the largest amount. Sulfur and nitrogen oxides react with limestone added to the boiler along with the coal. The product of this reaction, primarily calcium sulfite and calcium sulfate, can be removed from the bottom of the boiler.
What do you mean by fluidized bed combustion What are the advantages of it?
In fluidized bed combustion, rapid mixing ensures uniformity of temperature. The main advantage of fluidized bed combustion system is that municipal waste, sewage plant sludge, biomass, agricultural waste and other high moisture fuels can be used for heat generation.
Which of the following are the advantages of fluidized bed combustion?
Advantages of Fluidized Bed Combustion Boilers:-
- High Combustion Efficiency.
- Reduction in Boiler Size.
- Fuel Flexibility.
- Ability to Burn Low Grade Fuel.
- Ability to Burn Fines.
- Pollution Control.
- Low Corrosion and Erosion.
- Easier Ash Removal – No Clinker Formation.
What is bubble fluidized bed?
Abstract. GAS fluidized beds are characterized by ‘bubbles’ which rise through them, modifying the gas flow path and moving solid particles.
In which regime does the circulating fluidized bed operate?
Circulating fluidized-bed gasifiers (Figure 6.9) consist of a riser (operates either in turbulent or fast fluidization regime) in which feedstocks undergo moisture evaporation, pyrolysis, and char gasification, a high-temperature cyclone separator in which coarser particles are captured from the product gas and are …
What is bubbling fluidized bed boiler?
A bubbling fluidized bed (BFB) boiler is a boiler that can also handle fuels that are difficult to pulverize or less combustible. The fuel is introduced into a mixture of sand flowing at high temperatures, allowing the fuel to be efficiently combusted.
What is the main advantage of a fluidized bed boiler?
The main advantage of fluidized bed combustion system is that municipal waste, sewage plant sludge, biomass, agricultural waste and other high moisture fuels can be used for heat generation. A fluidized furnace has an enclosed space with a base having openings to admit air.
Which are the advantages of FBC Mcq?
How does fluidized bed combustion reduce pollution?
The low combustion temperature reduces corrosion and fouling of heat-transfer surfaces, allows a lower emission of nitrogen oxides and alkalis, and also permits control of sulphur dioxide emission by direct addition of limestone or dolomite to the fluidized bed.