Abstract
Solid circulation rate (Gs) represents the mass flux of circulating particles in circulating fluidized bed (CFB) systems and is a significant parameter for the design and operation of CFB reactors. Many measuring technologies for Gs have been proposed, though few of them can be applied in industrial units. This paper presents a comprehensive study on measuring technologies, and the results indicate that though the accumulation method is most widely applied, it is constrained by the disturbance of normal particle circulation. Some publications have proposed mathematic models based on pressure drop or other parameters to establish Gs measurement models; these necessitate the accurate modeling of complicated gas-solid flows in industrial devices. Methods based on certain measurement devices to specify parameters like velocity require device endurance in the industrial operation environment and stable local gas-solid flow. The Gs measuring technologies are strongly influenced by local gas-solid flow states, and the packed bed flow in standpipes make the bottom of standpipes an ideal place to realize Gs measurement.
Highlights
Circulating fluidized bed (CFB) systems have been widely applied in the fields of energy, chemical engineering, metallurgy, etc
For a full-loop CFB system, the gas-solid flow in the bottom of the standpipe is usually viewed as a packed bed flow or minimum fluidization state, which depends on the geometric structure and operation parameters
For a CFB system, solid circulation rate Gs is a key parameter for the design and operation of CFB boilers, chemical looping combustors, dual fluidized bed systems, etc
Summary
Circulating fluidized bed (CFB) systems have been widely applied in the fields of energy, chemical engineering, metallurgy, etc. As a type of complex industrial equipment, many parameters will influence the design and operation of CFBs, including the solid circulation rate (Gs). For a dual fluidized bed (DFB) system, which is widely applied in the gasification field, the solid circulation rate will strongly influence the mass and energy balances of both the individual fluidized bed reactor and the whole system [7]. The solid circulation rate is a key parameter for all kinds of CFB equipment and will strongly influence the design and operation. Scholars have developed various measuring technologies for the solid circulation rate in CFBs; few of them can be applied in industrial equipment [8,9]. An understanding of future perspectives of measuring technology and some areas of future research are presented
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