Measurement and modeling of solids flow behaviors in an aerated standpipe and inclined pipe of circulating fluidized bed full-loop system

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2024-11-03 DOI:10.1016/j.powtec.2024.120414

Chunguang Zhou , Christian Jonasson , Marcus Gullberg , Fredrik Ahrentorp , Christer Johansson

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Abstract

To control solids circulation and optimize design and operating parameters in a circulating fluidized bed full-loop system, measurement and modeling of solids flow behaviors in an aerated standpipe and inclined pipe were conducted. Different aeration gas flows were injected at the inclined pipe, which was equipped with different orifice sizes of 37 mm, 54 mm and 75 mm, for regulating solids flow rates. The magnetic tracer-tracking method, which only needs to inject one small magnetic tracer for each measurement to follow the main solids flow, was successfully demonstrated for measuring sand particles' real-time discharge rates, with good accuracy and no calibration requirement. A mathematical model was constructed to predict solids discharge rates and investigate the adverse effect of the pressure gradient in the standpipe bed in a full loop fluidized bed system. The optimization of the solids-return and circulation unit could therefore be achieved with the tools developed in this study.

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循环流化床全循环系统充气立管和斜管中固体流动行为的测量与建模

为了控制循环流化床全环系统中的固体循环并优化设计和运行参数，我们对曝气立管和斜管中的固体流动行为进行了测量和建模。在倾斜管中注入不同的曝气流量，倾斜管配备了 37 毫米、54 毫米和 75 毫米的不同孔径，用于调节固体流量。磁性示踪跟踪法每次测量只需注入一个小的磁性示踪剂即可跟踪固体主流，该方法成功地用于测量沙粒的实时排放率，具有良好的准确性，且无需校准。建立了一个数学模型来预测固体排出率，并研究了全循环流化床系统中立管床压力梯度的不利影响。因此，利用本研究开发的工具可以实现固体回流和循环装置的优化。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.