Lastest Updates of FBC Technology in China
Fluidized bed combustion (FBC) technology has been widely used in China for heat and power generation since the early 1960s due to its wide fuel flexibility, excellent emission control and wide range of load adjustability. In the late 1980s, this technology is developed into circulating fluidized bed combustion due to its advantage in scaling up and higher efficiency. Nowadays, the total number of FBC boilers put into operation in China is about 4000, and about 3,000 of them are CFB ones.
The development of the CFB boilers in China can be divided into four periods: learning (1980-1990), improvement (1990-2000), scaling and maturating (2000-2005) and self-development (2005-present).
In the first period, it was popularly regarded that a CFB boiler was a building bed boiler with a larger and taller furnace plus a separator in China and international wide.Technology development of CFB boiler was largely based on the experience of bubbling bed. The capacity of the CFB boilers was below 75t/h, most in 35-75t/h, and their steam pressure is rather low.
In the second period, supported by the government, Chinese researchers conducted vast amount fundamental studies on the gas-solid, two phase flow, heat transfer and combustion in CFB boiler and grasped the key knowledge and know-how of CFB boiler. Along with the economic blooming, more than one hundred CFB boiler with improved deign with capacity of 75-130t/h were also put into operation in China. The gas-solid separators with low collection efficiency were not used anymore.
The third period is a scaling-up and maturating period. The major Chinese boiler works imported advanced foreign technologies to build CFB boilers larger than 100MWe including the subcritical 300MWe ones. These technologies are localized into domestic ones. At the same time, Chinese researchers independently developed their own reheat CFB boilers based on the experience accumulated in smaller capacity CFB boiler development in the first two periods, and improved some foreign technologies to burn Chinese local coals. In the third period, CFB boilers dominated heat power co-generation plants and emerging in utility boiler market in China.
The latest period, the first 300MWe CFB boiler licensed from Alstom was successfully demonstrated. Based on the imported technologies and domestic experiences, new design with independent intellectual property of the 300MWe CFB size was also developed. Both foreign and domestic technologies have been rapidly used in more than 100 units. The largest 600MWe supercritical CFB boiler will be demonstrated in China in the next two years.
More than half of CFB boilers in the world, in both number and in capacity are in China. CFB technology owns an irreplaceable position in the market of steam and co-generation, and enters the power generation market recently. Fluidized Bed Combustion Nowadays, the total number of FBC boilers put into operation in China is about 4000, and about 3,000 of them are CFB ones. The largest capacity of CFB boilers is 300MWe and was put in operation in 2008. By the end of May 2010, there are 32 300MWe CFB units in operation and about other 50 units are under construction or will be under construction soon.
FBC/CFB technology has been widely used in coal-fired boilers in China and becomes a key technology for power and heat generation. To compete with conventional pulverized coal fired boiler in power generation, CFB has to go large in capacity and supercritical in steam parameters. Based on the Specific State Design theory of CFB boilers, Tshinghua University developed a novel CFB technology by reconstructing the fluidization state in the furnace by adjusting the bed pressure drop and bed quality. The application showed that such a technology can greatly avoid the erosion and reduce the auxiliary power. More applications on FBC technology in gasification and combustion of other fuels are expected to be achieved in near future.
Circulating fluidised bed Boiler Cases
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Basic Information of CFB Boiler manufacturer--- ZG Boiler
Number of Employees:above 1500 People
Our products:industrial horizontal steam boiler and hot water boiler(biomass boiler, gas boiler, oil boiler, coal boiler, etc), CFB boiler, power plant boiler, waste heating recovery boiler, Pressure Vessel(AAC autoclave, Curing tank,etc )
Factory Size (Sq.meters):400,000 square meters
Factory Location:Factory 1: Zhengzhou,,Henan, China. Factory 2: Xingyang,Henan,China
Number of R&D Staff:376 people
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Total Annual Sales Volume:US$100 Million
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