Abstract In the paper, a novel dual circulating fluidized bed (DCFB) reactor is introduced, which can be widely applied in catalytic cracking, chemical looping combustion, coal/biomass combustion and gasification, and gas adsorption, etc. The study mainly investigates the effects of specific operating parameters on pressure balance and solid circulation rate, including total solids inventory, riser gas velocity, bubbling fluidized bed gas velocity and pot-seal gas velocity. It is found that changes of those parameters lead to variations in pressure balance and riser axial voidage in DCFB system, and further affect solid concentration and solid circulation rate in the system. To be more specific, total solids inventory, riser gas velocity and bubbling fluidized bed gas velocity have a major impact on solid concentration and solid circulation rate, while pot-seal gas velocity only exerts a minor impact. Besides, the changing of overall pressure drop across the bubbling fluidized bed is consistent with variations in pressure drops in the other parts of the system, with the former equaling △Pr + △Pc + △Pp-t + △Pud1 + △Pud2. In this way pressure balance in the system is maintained. Eventually the paper reaches the conclusion that relevant operating parameters can be adjusted to control pressure distribution and solid circulation rate in different parts of the system and further to ensure the safe and stable operation of DCFB reactors.

中文翻译：

---

DCFB反应器压力平衡和固体循环特性的控制

摘要 介绍了一种新型双循环流化床（DCFB）反应器，可广泛应用于催化裂化、化学循环燃烧、煤/生物质燃烧与气化、气体吸附等方面。压力平衡和固体循环速率的具体操作参数，包括总固体存量、提升管气体速度、鼓泡流化床气体速度和罐密封气体速度。发现这些参数的变化导致DCFB系统压力平衡和立管轴向空隙率的变化，并进一步影响系统中的固体浓度和固体循环速率。更具体地说，总固体含量、提升管气体速度和鼓泡流化床气体速度对固体浓度和固体循环速率有重大影响，而罐封气体速度只产生很小的影响。此外，鼓泡流化床整体压降的变化与系统其他部分压降的变化一致，前者等于△Pr+△Pc+△Pp-t+△Pud1+△Pud2。以此方式维持系统中的压力平衡。最终得出结论，可以通过调整相关运行参数来控制系统不同部分的压力分布和固体循环速率，进一步保证DCFB反应器的安全稳定运行。前者等于△Pr + △Pc + △Pp-t + △Pud1 + △Pud2。以此方式维持系统中的压力平衡。最终得出结论，可以通过调整相关运行参数来控制系统不同部分的压力分布和固体循环速率，进一步保证DCFB反应器的安全稳定运行。前者等于△Pr + △Pc + △Pp-t + △Pud1 + △Pud2。以此方式维持系统中的压力平衡。最终得出结论，可以通过调整相关运行参数来控制系统不同部分的压力分布和固体循环速率，进一步保证DCFB反应器的安全稳定运行。