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BoilersBubbling Fluidized Bed (BFB) 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.

Since Mitsubishi Hitachi Power Systems (MHPS) delivered its first commercial BFB boiler in 1984, it has established an impressive track record of many deliveries.

Customers can choose the optimum BFB boiler based on desired power generating output and the characteristics of the biomass to be used. In this way, MHPS responses to a diverse range of customer needs.

Overview

Supports a Wide Variety of Fuels

In BFB combustion, a material with a large thermal capacity such as sand is used as the flow medium. This allows for the stable combustion of a wide variety of fuels, from moisture-rich fuels to those with low combustibility.

In addition to coal, our BFB boilers support a wide array of fuels from wood biomass such as waste wood and construction waste materials to industrial waste such as waste tires.

Stable Emissions of Foreign Particles

At the bottom of the BFB, the bed drain extraction method is used based on the amount of foreign particles in the fuel. At the same time, the use of an appropriate furnace bottom shape and air nozzle shape ensures that foreign particles carried through the BFB are expelled outside the system in a stable manner, preventing poor flow associated with sedimentation inside the BFB.

Low Environmental Impact

As BFB combustion allows for sufficient combustion under lower temperatures up to around 900°C, the release of nitrogen oxides (NOx) and other pollutants can be reduced.

Delivery Records

Customer
EF-ON Inc.
Plant
Bungo-ono Power Plant
Maximum continuous rating
75 t/h
Steam conditions
(heater outlet)
Steam temperature
505°C
Steam pressure
10.3 MPag
Fuel
Wood chip (for startup: Bunker A)
Start of operation
2016

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