Control of pressure balance and solids circulation characteristics in DCFB reactors
Control of pressure balance and solids circulation characteristics in DCFB reactors
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DCFB 反应器中压力平衡和固体循环特性的控制
DOI：
10.1016/j.powtec.2017.12.092
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发表时间：
2018
影响因子：
5.2
通讯作者：
Yang Yongrong
中科院分区：
文献类型：
--
作者：
Zhou Yefeng;Yang Lei;Lu Yujian;Hu Xiayi;Luo Xiao;Chen Hongbo;Wang Jingdai;Yang Yongrong
介绍了一种新型双循环流化床反应器，该反应器可广泛应用于催化裂化、化学链燃烧、煤/生物质燃烧和气化以及气体吸附等领域。鼓泡流化床气体速度和罐密封气体速度。结果表明，这些参数的变化会引起系统压力平衡和提升管轴向空隙率的变化，进而影响系统中的固体浓度和固体循环速率。具体而言，总固体存量、提升管气速和鼓泡流化床气速对固体浓度和固体循环速率的影响较大，而罐封气速的影响较小。鼓泡流化床总压降的变化规律与系统其它部分压降的变化规律一致，前者为△Pr+ △Pc+ △Pp-t+ △ Pud 1 + △ Pud 2。以这种方式，系统中的压力平衡得以维持。通过调整相关操作参数，可以控制系统各部分的压力分布和固体循环量，从而保证DCFB反应器的安全稳定运行。
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.