How does fluidized-bed combustion 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.
What is circulating fluidized bed reactor?
Circulating fluidized bed (CFB) is one of the favored technologies in power generation industries due to its distinct advantages of high heat and mass transfer rates, homogeneous reactor temperatures, extended gas-particle contact time, low pollutant emission and fuel flexibility (Li et al.
What are the components of CFB?
Non-mechanical valves, gas distributors, and cyclone separators are three major components of a typical circulating fluidized bed (CFB) furnace. These are integral parts of the CFB loop, around which hot solids recirculate continuously.
What is a CFB plant?
Circulating Fluidized Bed (CFB) Reactor Power Plants Sometimes referred to as cogeneration plants, or simply “cogens”, the CFB plants employ advanced pollution control equipment that allow them to meet the strictest air quality emission standards in producing electricity.
What are the two main units in a circulating fluidized bed?
Explanation: The two main units in a circulating fluidized bed are circulating unit and gasifier unit.
What is bubbling fluidized bed boiler?
Boilers. 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 CFB type boiler?
Circulating fluidized bed (CFB) boilers use all kinds of solid fuels, from biomass to refuse derived fuel (RDF), to produce reliable and efficient clean energy. Fuel flexibility is at the core of CFB technology, contributing to fossil fuel and CO 2 emissions reduction while using local alternative renewable fuels.
Which mattress is used in fluidized bed combustion boiler?
Atmospheric fluidized beds use limestone or dolomite to capture sulfur released by the combustion of coal. Jets of air suspend the mixture of sorbent and burning coal during combustion, converting the mixture into a suspension of red-hot particles that flow like a fluid. These boilers operate at atmospheric pressure.
What are the two main units in circulating fluidized bed?
Which mattress is used in fluidized-bed combustion boiler?
Why is fluidization done?
Fluidization is defined as a method to keep solid particles floating in an upward direction (Figure 5) in a flow of gas or liquid. In freezing, fluidization occurs when particles of a similar shape and size are subjected to an upward stream of low-temperature air.
What is the temperature range in a bubbling fluidized bed?
between 700 and 900 degree Celsius
What is the temperature range in a bubbling fluidized bed? Explanation: The temperature range in a bubbling fluidized bed gasifier is between 700 and 900 degree Celsius.
What is slugging in fluidized beds?
The slug flow (or slugging) regime arises in gas-fluidized beds when bubbles grow sufficiently large that their shapes and rising velocities are mainly determined by the diameter of the column in which they are found.
What are types of fluidization?
Based on different Geldart particle groups and gas velocities, several different fluidization regimes can be observed: fixed bed, homogeneous fluidization, bubbling fluidization, slugging fluidization, turbulent fluidization, and entrainment process.