How does a circulating fluidized bed boiler work?
In the cyclone the heavier particles separate from the gas and falls to the hopper of the cyclone. This returns to the furnace for recirculation. 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.
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 circulating fluidized bed combustion?
The circulating fluidized bed (CFB) is a type of Fluidized bed combustion that utilizes a recirculating loop for even greater efficiency of combustion. while achieving lower emission of pollutants. Reports suggest that up to 95% of pollutants can be absorbed before being emitted into the atmosphere.
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 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.
What are the types of fluidized bed boilers?
6.3 Types of Fluidised Bed Combustion Boilers 1. Atmospheric classic Fluidised Bed Combustion System (AFBC) 2. Atmospheric circulating (fast) Fluidised Bed Combustion system(CFBC) 3. Pressurised Fluidised Bed Combustion System (PFBC).
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.
Why fluidized bed combustion is used?
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.
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 temperature range in a fluidized bed gasification?
between 900 and 1050 °C
Fluidized- bed gasifiers typically operate at temperatures between 900 and 1050 °C, which is below the softening point of ash (Higman and van der Burgt, 2003).
Which of the following is advantage of fluidized bed combustion boiler?
FBC boilers can burn fuel with a combustion efficiency of over 95% irrespective of ash content. FBC boilers can operate with overall efficiency of 84% (plus or minus 2%). High heat transfer rate over a small heat transfer area immersed in the bed result in overall size reduction of the boiler.