Circulating fluidized bed boiler(CFB Boiler) development

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Based on the requirements of energy and environmental issues introduced the development of China and other countries in the circulating fluidized bed boiler, the analysis of its current situation and prospects in the Chinese coal-fired power sector.

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Circulating fluidized bed boiler(CFB Boiler) development

  1. 1. Circulating fluidized bed boiler development situation and prospects Abstract: Based on the requirements of energy and environmental issues introduced the development of China and other countries in the circulating fluidized bed boiler, the analysis of its current situation and prospects in the Chinese coal-fired power sector. With the continuous advancement of technology, coal-fired power toward high efficiency, low pollution direction, to meet human society on energy and environmental requirements. In theory, the fuel cell as the representative of the new coal-fired power generation technology will have a huge impact on the traditional coal-fired power generation, but taking into account the feasibility of industrial technology, circulating fluidized bed power plant boiler more people's attention . Currently, many countries including the United States are working on electric boiler circulating fluidized bed. In coal-fired power generation, coal-fired steam combined cycle gas boiler is on the rise, the basic form of the main coal-fired integrated gasification combined cycle (IGCC) boilers, pressurized fluidized bed coal-fired combined cycle (PEBC-CC) boiler and atmospheric fluidized bed coal-fired combined cycle (AFBC-CC) boiler three kinds. Which, IGCC and PFBC boiler boiler was gradually increasing. Currently large-scale Chinese circulating fluidized bed boiler and reliability has made great progress. First, the status of foreign circulating fluidized bed boiler Study abroad began circulating fluidized bed boiler in the 1970s, it was boiling furnace and chemical industries circulating fluidized bed technology evolved from a bubbling bed. In 1982, the German company's first station lurgi 50 t / h circulating fluidized bed boiler put into commercial operation. Since then, the world's leading boiler manufacturers continuous research and product development circulating fluidized bed boiler technology. After 30 years of rapid development, foreign CFB boiler manufacturers have a greater impact: Lu Qi Company, France GASI company, American ABB-CE, the United States Foster-Wheeler Company, Ahlstrom, Finland, Germany Babcock company, Italy Tempella company.
  2. 2. 1.1 France GASI company France GASI company introduced Ruzzi company circulating fluidized-bed boiler technology, from the outset, it is committed to large scale circulating fluidized bed boiler's product development efforts. In 1991, construction of France East Emile Hucher 125 MW CFB boiler of power station operation, the boiler capacity of 367 t/h, parameter 13.4MPa,545 ° c/540 degrees Celsius. 98% available in 1996 rate, good emission performance, the SO2 emission 200mg/m3~350mg/m3,NOx 130mg/M3~350mg/M3. This boiler develops 250MW unit of circulating fluidized bed boiler did a lot of experimental demonstration. In 1995, GASI company in France Provence southern power plants put into operation 1 sets of circulating fluidized bed boiler, boiler capacity 700 t/h, parameter 16.9 MPa,565 ° c/565 degrees Celsius. Boiler efficiency of 90.5% and desulphurization efficiency of 97%,SO2 into 250mg/M3, and NOx into less than 250mg/M3. GASI companies for the development of greater capacity (400MW~600MW) of circulating fluidized bed boilers in this pot did a lot on demonstration and preliminary preparatory work, such as the lower part of the furnace "underwear" type design, as well as built-in type fluidized-bed heat exchanger and water wall extended heated surface. Provence power station 250 MW boiler continues to be the largest capacity circulating fluidized bed boilers in the world. Provence power station 250 MW boiler successfully put into operation not only to resolve the large circulating fluidized bed boiler design of many technical issues, and enable manufacturers and users of large-scale circulating fluidized bed boilers by further increasing confidence. GASI company has completed the preliminary design of 600 MW circulating fluidized bed boiler. It also for has super critical steam parameter Lurgi type cycle stream of bed boiler of research, steam parameter for 30 MPa/580 ℃/580 ℃/580 ℃, research results indicates that due to Lurgi type cycle stream of bed boiler has external hot Exchange players, patrons reset hot Exchange players of work temperature in 700 ℃, using clean air stream of, out reset hot Exchange players within layout high temperature hot Exchange players can prevent high temperature corrosion, thus used Super critical parameter than coal powder boiler more enabling, can makes power efficiency improve about 6%. 1.2 United States ABB-CE company ABB-CE company of circulating fluidized bed technology was imported from Lurgi company, it produces the 1th of circulating fluidized bed boilers put into operation in 1986, and installed in the United States Scott Paper plant, unit capacity of 65MW, Smokeless coal fueled. Since then, the ABB-CE company stepped up its research and development, built the world's largest circulating fluidized-bed boiler thermal test platform. ABB-CE company has put into operation a maximum capacity circulating fluidized bed in Korea Tonghae 220 MW unit's circulating fluidized bed boilers in power plants. Boiler capacity 693t/h, parameter 1703 MPa,540 ° c/540 degrees Celsius. Its significance lies not only in volume increases, more importantly anthracite. This is the first
  3. 3. large scale circulating fluidized bed boiler burning anthracite coal. Therefore, for circulating fluidized bed boiler burning anthracite in technological developments and accumulated valuable experience. 1.3 United States Foster-Wheeler company Development of circulating fluidized bed boiler and thermal test bench Foster-Wheeler company was established in 1986, has made a lot of test data. In 1993, for the first time United States Fort Howard paper company manufactured the 30 MW unit's circulating fluidized bed boiler. Foster-Wheeler company of large scale circulating fluidized bed furnaces with pressure balancing the gap are the main features of partition wall structure in the Middle, the main objective is to eliminate the walls on either side of the pressure difference can also ensure the furnace in fluid dynamics in the width direction. In structural design, Foster-Wheeler company also offers many features: unique device under the pipeline, steam cooled cyclone, one-piece heat exchange bed redirect ogive, sent j-valves and other solid materials. Second, China's current situation circulating fluidized bed boiler In the early 1960s, China began to develop a fluidized bed boiler, the world's largest coal-fired fluidized bed boiler usage, currently there are about 3,000 nationwide fluidized bed boiler running. However, circulating fluidized bed boiler has started late, only until November 1989's first 35t / h circulating fluidized bed boiler in Shandong Ming hydropower plants in operation. Since then, a number of small and medium capacity (75t / h based) circulating fluidized bed boilers have been put into operation around the small thermal power plants, of which the vast majority of domestic self-developed research, only a small amount is the introduction of technology to produce. Just a few years, the production and application of a circulating fluidized bed has been a great development. Developed its own 220t / h (50MW) circulating fluidized bed boiler voltage station run successfully for many years of experience. So far, the maximum capacity of the circulating fluidized bed coal-fired boilers have been put into operation for the 450t / h.
  4. 4. Third, the circulating fluidized bed boiler market outlook Coal is the main form of China's energy consumption , more than 70% of total coal-fired generating capacity , as well as a large number of industrial boilers consume several million tons of coal annually . From the characteristics of the natural resources of our current perspective, this situation for a long time is difficult to have a fundamental change ; on the other hand , China is one of the countries with the highest economic growth rate in the world , along with economic development , energy consumption, mainly coal consumption increased rapidly , which will bring serious air pollution problems. Since China is still a developing country , its economic conditions determine it can not guarantee that all stations can be installed in addition to sulfur and accounted for expensive equipment in addition to nitrate plants with a total investment of 1 /5 to 1 /4 . Due to a large number of coal-fired generating NOx and SO2 directly into the atmosphere , causing serious air pollution. In addition to circulating fluidized bed boiler of other clean coal technologies such as integrated gasification combined cycle power generation system and pressure fluidized bed combined cycle power generation system is still in the development stage or introduce experimental study . After 10 years of rapid development , small and medium sized circulating fluidized bed technology in China has matured . On this basis, the large-scale circulating fluidized bed boiler is also being accelerated and made some progress . Domestic unit corresponding to 50MW CFB technology has matured, developed its own 250MW units have been circulating fluidized bed boiler voltage station years of successful operating experience , and build greater capacity coal-fired circulating fluidized bed boiler . Visible , after the early rapid development and subsequent adjustment , coupled with circulating fluidized bed technology can better adapt to China's coal resource distribution and regional characteristics . With clean coal combined cycle technology is mature, lower investment , circulating fluidized bed boilers in China will have broad market prospects.

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