Coal Fired Circulating Fluidized Bed Technology for Large Scale Power Generation

Coal fired Circulating Fluidized Bed Technology for Large Scale Power Generation

Coal fired circulating fluidized bed tehcnology introduction:

The target for high efficiency in modern power plants is set not only because of economical

reasons but also for enhanced environmental performance in terms of reduced fuel needs,

quantity of ash generated and pollutants emitted. Cutting CO2 emission has become

increasingly important after the Kyoto Protocol and European Union emission trading. As

coal will remain an important source of energy, the focus has been set to improve the

efficiency of coal fired power plants. To achieve this goal, supercritical steam parameters

have been applied. Most large European thermal power plants built for fossil fuels such as

coal and brown coal over the last decade have had supercritical steam parameters and have

been based on pulverized coal (PC) fired once-through boiler technology. Circulating

Fluidized Bed (CFB) boiler technology has been growing in size and number over the past

three decades and it has established its position as utility scale boiler technology. Plant sizes

up to 460 MWe are in commercial operation today, including the 460 MW.

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280 ton CFB boiler for Metallurgical Plant

When the ZG power plant began commercial operations in late June 2009, it marked a

new era in the evolution of circulating fluidized bed (CFB) technology. At the heart of the

460 megawatt electric (MWe) ZG power plant is the world’s largest CFB boiler, which is

also the world’s first once-through unit (OTU) supercritical CFB boiler. Large enough to

produce electricity at utility scale, the ZG plant has met or exceeded all emissions and

performance expectations since coming online.

The unit incorporates also – for the first time ever in any CFB – highly efficient BENSON

vertical once-through technology developed and licensed by Siemens AG, Germany. ZG CFB technology with its low and uniform furnace heat flux is...