Research and Development of Ultra-supercritical Circulating Fluidized Bed Boiler
With the increase of technological progress and the demand for energy conservation and emission reduction,a more advanced ultra-supercritical circulating fluidized bed(CFB)boiler technology has become the development trend of the industry.This paper delves into the design philosophy of ultra-supercritical CFB boiler technology,including key technologies such as fluidized combustion,hydrodynamic system,pollutant control,and system integration.The uniformity and burnout of fluidized combustion in large-size furnace are analyzed,and the design of combustion system in different furnace types is discussed.The design schemes of the hydrodynamic system for vertical tube bundles with low mass flow rate under ultra-supercritical pressure conditions are investigated.Design concepts for pollutant control under conditions of large cross-section and high furnace chamber are proposed.Through analyzing the coupling characteristics of boiler combustion technology,thermal system and auxiliary system,the optimization direction of combustion-side and steam-side system design is indicated.Based on in-depth research of key technologies and practical experience of supercritical CFB boilers,a variety of ultra-supercritical CFB technical schemes have been formed.Multiple projects using different technical solutions have entered the engineering application stage,where reliability,flexibility,cleanliness,and efficiency are key considerations in the design.It is expected that these diverse ultra-supercritical CFB technical routes will demonstrate flexibility and low-carbon advantages in future development.
ultra-supercriticalcirculating fluidized bed boilerfluidization optimizationhydrodynamic forcedeep peaking
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