Supercritical fluidized-bed boilers have the advantages of both low pollutant emissions and high power generation efficiency. They are in line with China's energy-saving and emission-reduction strategy needs and are an inevitable trend for the development of circulating fluidized bed boiler technology. At present, the largest capacity circulating fluidized bed boiler that has been put into operation is a 600MW supercritical circulating fluidized bed boiler, but with the further enlargement of the boiler capacity and the further improvement of parameters, the existing furnace types are facing many problems, so there is an urgent need for development and application. New type of circulating fluidized bed boiler for large capacity and high parameters.

The Circulating Fluidized Bed Laboratory of the Institute of Engineering Thermophysics of the Chinese Academy of Sciences began researching and developing supercritical fluidized bed boiler technology in 2005. Several key technologies and system integrations suitable for supercritical parameters circulating fluidized bed boilers have been proposed.

During the period from 2005 to 2010, the company completed the research on the key technologies and schemes of the 600MW supercritical circulating fluidized bed boiler in cooperation with large-scale boiler enterprises, and completed the National Science and Technology Support Question “Eleventh Five-Year Plan” “600MW Supercritical Circulating Fluidized Bed Boiler Commissioning. "Operations" completed the orientation project for the hospital in 2011 and formed a technological plan for the supercritical single hearth circulating fluidized bed boiler. Since 2011, in cooperation with large-scale boiler companies, the company has developed 600 to 1000 MW ring furnace supercritical fluidized bed boiler technology, and jointly built a cold model test platform for circular furnace circulating fluidized bed boiler with an air volume of 40000m3/h. Then a series of topics such as gas-solid flow pattern, fluidization uniformity, and uniformity of material distribution among multiple loops were developed. The research results show that the annular furnace circulating fluidized bed has significant advantages in terms of fluidization uniformity, secondary air permeability, etc., which shows good prospects for development of large-capacity and high-parameter circulating fluidized bed boilers.

In view of the huge application advantages of the annular furnace circulating fluidized bed, in 2012, the research and development of the supercritical circulating fluidized bed boiler was included in the strategic pilot technology project of the Chinese Academy of Sciences “the key technologies and demonstrations of low-rank coal clean and efficient cascade utilization”. The research topic "Supercritical Fluidized Bed Combustion Technology and Demonstration".

From 2013 to 2014, the research team successively built two sets of 660 MW annular furnace circulating fluidized bed boiler cold model test benches in the research center of Langfang Research and Development Center, and carried out the circulation main loop flow uniformity and the separation system uniform distribution. Such as a large number of cold test and numerical simulation studies, the optimization of key structures and parameters based on the uniformity of the material distribution in the circulation loop was completed. By optimizing the structure, the deviation of the circulating material flow rate among the circulation circuits was greatly reduced, and the solution was resolved. The uniformity of material distribution in the annular furnace.

At present, the optimized annular hearth furnace type has been applied to the design of a 660MW supercritical circulating fluidized bed boiler. At the same time, these research results are being applied to the development of an optimized single hearth furnace. In 2015, we will continue to carry out in depth the research task of leading special projects, carry out furnace type optimization research of 350MW supercritical CFB boiler polygonal furnace, and lay the foundation for the establishment of systematic furnace design criteria and industrial applications.

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