Hydrodynamic Characteristics in a Cold Flow Model of Quadruple Fluidized Bed Gasifier

Abstract

Quadruple fluidized bed gasifier (QFBG) is a new kind of clean power-generation system, which consists of a dual fluidized bed (DFB) gasifier and a dual fluidized bed of chemical looping. With high gasification efficiency and low carbon emissions, QFBG has attracted extensive attention. Hydrodynamic characteristics of the quadruple fluidized bed (QFB) system are the base of modeling and designing of a hot reactor. To fully understand the hydrodynamic characteristics, a cold flow model of the QFB system on a laboratory scale was designed and set up. In the cold model, operation parameters such as bubble fluidized bed velocity, riser velocity, and total solid inventory (TSI) were investigated. Meanwhile, an exclusive pressure balance equation of QFB is proposed. The QFB was also compared with DFB. The results from the experiment show that the QFB system has a positive response to the operation parameters and better solid transport capacity than the typical DFB system.