Circulating fluidized bed boiler technology opens a new round of innovation

      When the "30-60" goal is clearer, when the energy revolution to deeper development, when a new round of scientific and technological revolution and industrial revolution to accelerate the evolution of the energy field of deep transformation into a comprehensive countdown phase, coal power inevitably towards the "initiative to change" the development of The road of "active change" is inevitable.

　　Recently, the Chinese Academy of Sciences announced six highlights of the transfer of scientific and technological achievements in 2020, of which, China's first anthracite coal feedstock circulating fluidized bed gasification plant was selected for commissioning, was evaluated as a milestone.

　　Anshun coal in Guizhou is a low-quality anthracite coal with high ash content and low activity, which is difficult to gasify. The unit adopts the circulating fluidized bed gasification technology of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences, realizing the efficient and clean gasification of Anshun anthracite coal, fully verifying the strong coal adaptability and economy of circulating fluidized bed gasification technology, and seeking a realistic way for the efficient and clean utilization of high-sulfur anthracite coal in the southwest region of China.

　　It is no coincidence that the world's first 660 MW supercritical circulating fluidized bed boiler, which was put into operation at China Coal Shanxi Pingshuo Power Plant on September 16, 2020, also triggered widespread industry attention by burning low calorific value coal typical of Shanxi region.

　　"Achieving ultra-low emission circulating fluidized bed boilers with large size and high parameters reduces pollution control costs and may even replace a portion of ultra-low supercritical pulverized coal furnaces that burn high sulfur and low volatile coals." Yue Guangxi said this when talking about the future development direction of circulating fluidized bed combustion technology.

　　Circulating fluidized bed technology started late in China, but developed rapidly. 2000, China started the research of supercritical DC circulating fluidized bed boiler synchronously with the world, and in 2007, the first realization of energy-saving circulating fluidized bed boiler concept based on flow reconfiguration in Shanxi Datuhe thermal power plant, and the successful commissioning of 600,000 kW supercritical circulating fluidized bed boiler demonstration project in Baima power plant in April 2013, officially put circulating fluidized bed technology on the world stage. After ten years of development, China has come to the world's leading level in circulating fluidized bed combustion theory, design theory, engineering construction and domestic experience, and the total installed capacity of circulating fluidized bed has steadily ranked first in the world, and the steam parameters have reached the world's leading capacity per unit. Especially in 2017, China developed a new generation of ultra-low emission circulating fluidized bed technology, leaving foreign countries far behind. At present, China's leading circulating fluidized bed boiler technology is changing to supercritical and large-scale direction. This is evidenced by the data set of "135 MW class and 300 MW class large capacity CFB boiler models account for 73.2% of the total installed capacity and 73.8% of the total number of installed units". Moreover, the CFB boilers newly put into operation in recent years have significantly reduced power supply coal consumption and plant electricity rate, and some 300 MW CFB boilers with fluid reconstruction technology can even reduce the plant electricity rate to about 4%, which is basically comparable to the same level of pulverized coal boilers.

　　Southwest region is the application of circulating fluidized bed boiler technology "fertile ground". Kunming University of Science and Technology School of Metallurgy and Energy Engineering Vice President, Professor Li Fashe believes that "the distribution of coal resources in China shows the regional distribution of reserves west more east less, north more south less, and coal sulfur from the northwest to southwest gradually rising characteristics. Southwest region has larger coal reserves, more high-sulfur coal, and more low-quality coal. Circulating fluidized bed boiler technology has the advantages of wide fuel adaptability, high fuel utilization and low emission of combustion pollutants, which is especially suitable for coal with high sulfur, high ash, low volatile matter and low ash melting point in the southwest of China."