What are the disadvantages of fluidized bed combustion?
Disadvantages Of Fluidized Bed Combustion: It has to be maintained at a high value because there is a continuous requirement of high-pressure air for supporting the bed. 2) Due to the requirement of continuous high-pressure air, the cost of the auxiliary units of the plant increases.
What are the advantages of fluidised bed combustion?
The principal advantages of FBC systems include: (1) high fuel flexibility, including the capability of using fuels with a high content of sulfur or ash; (2) the capability for firing low-grade fuels, e.g., biomass, refuse-derived fuels, and wastes, and for co-firing different types of fuels; (3) in situ …
What are the advantages of the fluidized bed combustion system over the fixed bed and the suspension firing systems?
Circulating fluidized-bed combustion technology has a number of advantages over BFBC technology including [19]: Improved combustion efficiency and sulfur retention due to the use of finer particles, turbulent gas-particle mixing, and a high recycle rate. Smaller bed area due to the use of high fluidizing velocities.
What is the advantage of fluidized bed combustors when compared to other combustion methods?
Higher combustion efficiency due to 10 times more heat transfer than other combustion processes because of burning particle. Less area is required for FBC due to high coefficient of convective heat transfer.
Where is fluidized bed combustion used?
Fluidized Bed Combustion takes place when the forced draught fan supplies air to the Furnace of the Boiler. In the furnace, and is (used for Bubbling phenomenon) placed on the Bed and is heated before fluidization, the air enters the bed from the nozzles fitted on the Furnace Bed.
How does fluidized bed combustion remove pollutants?
In fluidized combustion, the fuel is burnt within a fluidized bed of mineral matter such as coal ash, silica sand, or limestone for sulfur retention. The passage of the air for combustion through the bed maintains the particles in a violently fluidized state.
Which of the following is disadvantage of fluidized bed dryer?
Disadvantages of Fluid Bed Dryer. A Possibility of Product Loss. Chances of Electrostatic Build Up May be High. Drying Sticky Material is Quite Difficult.
Which of the following is not the characteristics of a fluidized bed combustor?
13. Which one of the following is not a functioning model of fluidised bed? Explanation: The operation given as “Packed with fluid sliding on top” is not possible as a setup for fluidised bed because in this case the particles would get compressed and not in random free movement.
What is a fluidized bed dryer used for?
Fluid Bed Dryers 101. Fluid bed dryers, as their name suggests, are used for drying materials such as granules, tablets, powders, fertilizers, and plastics. They are particularly popular in production industries like: Chemical.
Which one of the following is not a functioning model of fluidized bed?
Which of the following is a disadvantage of fluidized dryer?
Disadvantages of Fluidized Dryers Requires increased gas handling due to extensive recirculation of exhaust gas for high thermal efficiency operation. 3. Poor fluidization and low flexibility especially if the feed is too wet. 4.
What are the disadvantages of fluidized bed combustion system?
Disadvantages Of Fluidized Bed Combustion: 1 In this combustion system, the fan speed has to be maintained at a high value. It has to be maintained at a high… 2 Due to the requirement of continuous high-pressure air, the cost of the auxiliary units of the plant increases. More
What are the disadvantages of a fluidized bed nuclear reactor?
The reactor can also operate at a continuous state with a fluidized bed. There are a few disadvantages to using fluidized beds. Due to the expansion of the materials in the reactor, the size of the vessel must be increased, which leads to a higher initial capital cost.
What are the advantages of a fluidized bed?
Some advantages of using a fluidized bed include uniform particle mixing and temperature gradients. Unlike pack beds that have poor mixing, fluidized normally allows for a more uniform product compared to other reactor designs. The reactor can also operate at a continuous state with a fluidized bed.
What is a fluidized bed combustion engine?
Fluidized Bed Combustion. Fluidized bed combustion (FBC) is a well-established commercial combustion technology, in which combustion occurs in the presence of high concentrations of solids, typically sand, ash or that derived from limestone, if in-situ sulphur capture is required (i.e., a bed), which are fluidized in a stream of combustion air.