关键词: 循环, 流化床, 反应器, 脱硫, 内构件, 传质

Abstract: Traditional desulfurization reactors have disadvantages such as nonuniform flow structure and low desulfurizer utilization efficiency. The internals in CFB（circulating fluidized-bed） have advantages of breaking bubbles and particle aggregation，improving the quality of the fluidization，enhancing the mass transferring and the desulphurization process，resulting in higher desulfurization efficiencies. This paper summarized studies on internal components in semi-dry circulating fluidized bed desulfurization reactors，including inertial separator，bluff-body internals，orifice internals and compound internals，and the forms and the characteristics. The inertial internals can intensify the gas-solid separation but have no influences on optimizing the flow field；the bluff-body internals can enhance the turbulence in the reactor but cannot affect the axial mixing；the orifice internals can make the flow field uniform but have disadvantages of blocking；and the compound internals can improve the fluid properties and strengthen the contact of gas-solid phase but make the pressure drop high. The flow characteristics of both gas and solid in fluidized bed with various internals were illustrated，and the advantages and disadvantages of various types of internals were discussed. Considering the variety features of pressure drop and the particles concentration with different internals，the direction such as promoting the gas-solid contact with high efficiency and reducing the pressure drop of the CFB for future development was discussed.

Key words: circulating, fluidized-bed, reactor, desulfurization, internals, mass transfer