CFB Circulating Fluidized Bed Boiler Design and Type

As a long history large and small scale ofCFB boiler suppliers in China, ZG provide customer more cfb Circulating fluidized bed boiler design and types. There have 30ton circulating fluidized bed boiler for sugar plant, 75t/h CFB boiler, 130 ton cfb boiler and 260 ton circulating fluidized bed boiler design provided. Among these, 75 ton / hour circulating fluidized bed boiler are most popular for foreign clients. Here, I will mainly talking about 4 CFB boiler types with its design as below:GM5Horizontal boiler

Fluidized Bed Combustion (FBC) Boiler

Fluidized Bed Combustion (FBC) Boiler.JPGGM5Horizontal boiler

Fluidized Bed Combustion (FBC) BoilerGM5Horizontal boiler

Fluidized bed combustion (FBC) has emerged as a viable alternative and has significant advantages over a conventional firing system and offers multiple benefits – compact boiler design, fuel flexibility, higher combustion efficiency and reduced emission of noxious pollutants such as SOx and NOx. The fuels burnt in these boilers include coal, washery rejects, rice husk, bagasse & other agricultural wastes. The fluidized bed boilers have a wide capacity range- 0.5 T/hr to over 100 T/hr.GM5Horizontal boiler

When an evenly distributed air or gas is passed upward through a finely divided bed of solid particles such as sand supported on a fine mesh, the particles are undisturbed at low velocity.As air velocity is gradually increased, a stage is reached when the individual particles are suspended in the air stream – the bed is called “fluidized”.GM5Horizontal boiler

With further increase in air velocity, there is bubble formation, vigorous turbulence, rapid mixing and formation of dense defined bed surface. The bed of solid particles exhibits the properties of a boiling liquid and assumes the appearance of a fluid – “bubbling fluidized bed”.GM5Horizontal boiler

If sand particles in a fluidized state are heated to the ignition temperatures of coal, and coal is injected continuously into the bed, the coal will burn rapidly and the bed attains a uniform temperature. The fluidized bed combustion (FBC) takes place at about 840OC to 950OC. Since this temperature is much below the ash fusion temperature, melting of ash and associated problems are avoided.GM5Horizontal boiler

The lower combustion temperature is achieved because of high coefficient of heat transfer due to rapid mixing in the fluidized bed and effective extraction of heat from the bed through in-bed heat transfer tubes and walls of the bed. The gas velocity is maintained between minimum fluidization velocity and particle entrainment velocity. This ensures stable operation of the bed and avoids particle entrainment in the gas stream.GM5Horizontal boiler

Atmospheric Fluidized Bed Combustion (AFBC) Boiler

Atmospheric Fluidized Bed Combustion (AFBC) Boiler.jpgGM5Horizontal boiler

Atmospheric Fluidized Bed Combustion (AFBC) BoilerGM5Horizontal boiler

Most operational boiler of this type is of the Atmospheric Fluidized Bed Combustion. (AFBC). This involves little more than adding a fluidized bed combustor to a conventional shell boiler. Such systems have similarly being installed in conjunction with conventional water tube boiler.Coal is crushed to a size of 1 – 10 mm depending on the rank of coal, type of fuel fed to the combustion chamber. The atmospheric air, which acts as both the fluidization and combustion air, is delivered at a pressure, after being preheated by the exhaust fuel gases. The in-bed tubes carrying water generally act as the evaporator. The gaseous products of combustion pass over the super heater sections of the boiler flowing past the economizer, the dust collectors and the air pre-heater before being exhausted to atmosphere.GM5Horizontal boiler

Pressurized Fluidized Bed Combustion (PFBC) Boiler

Pressurized Fluidized Bed Combustion (PFBC) Boiler.jpgGM5Horizontal boiler

Pressurized Fluidized Bed Combustion (PFBC) BoilerGM5Horizontal boiler

In Pressurized Fluidized Bed Combustion (PFBC) type, a compressor supplies the Forced Draft (FD) air and the combustor is a pressure vessel. The heat release rate in the bed is proportional to the bed pressure and hence a deep bed is used to extract large amounts of heat. This will improve the combustion efficiency and sulphur dioxide absorption in the bed.The steam is generated in the two tube bundles, one in the bed and one above it. Hot flue gases drive a power generating gas turbine. The PFBC system can be used for cogeneration (steam and electricity) or combined cycle power generation. The combined cycle operation (gas turbine & steam turbine) improves the overall conversion efficiency by 5 to 8 percent.GM5Horizontal boiler

Atmospheric Circulating Fluidized Bed Combustion Boilers (CFBC)

 Atmospheric Circulating Fluidized Bed Combustion Boilers (CFGM5Horizontal boiler

Atmospheric Circulating Fluidized Bed Combustion Boilers (CFBC)GM5Horizontal boiler

In a circulating system the bed parameters are maintained to promote solids elutriation from the bed. They are lifted in a relatively dilute phase in a solids riser, and a down-comer with a cyclone provides a return path for the solids. There are no steam generation tubes immersed in the bed. Generation and super heating of steam takes place in the convection section, water walls, at the exit of the riser.GM5Horizontal boiler

CFBC boilers are generally more economical than AFBC boilers for industrial application requiring more than 75 – 100 T/hr of steam. For large units, the taller furnace characteristics of CFBC boilers offers better space utilization, greater fuel particle and sorbent residence time for efficient combustion and SO2 capture, and easier application of staged combustion techniques for NOx control than AFBC steam generators.GM5Horizontal boiler

CFB Circulating Fluidized Bed Boiler Design and Types.jpgGM5Horizontal boiler

CFB Circulating Fluidized Bed Boiler Design and TypesGM5Horizontal boiler

For more CFB Circulating Fluidized Bed Boiler Design & Types, welcome to contact us at any time! Or you can leave us message in below form. We will back to you within 24 hours. Our Email: [email protected] for support.GM5Horizontal boiler
 GM5Horizontal boiler

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