Numerical study on fluid flow and heat transfer in grille-support structured packed beds

doi:10.11949/0438-1157.20200488

Abstract

Abstract:

Packed beds of particles are widely used in chemical industrial production as core units of fixed bed reactors, dryers, filters and other equipment. Based on traditional structured packed beds, this paper proposes some novel grille-support structured packed beds. The novel grille-support packed beds can be quickly constructed by using the new grille, including grille-support simple cubic (G-SC), grille-support body center cubic (G-BCC), grille-support loose face center cubic (G-LFCC) and grille-support compact face center cubic (G-CFCC) packing. In this paper, the flow and heat transfer characteristics of grille-support structured packed beds are numerically studied. Results show that, the packed beds with different packing forms have diverse flow and heat transfer performance. Under the same face center cubic packing form, the flow and heat transfer could be also significantly different with disparate grilles. It is also revealed that, compared with the traditional structured packed bed, the pressure drop of the grille-support structured packed bed is reduced while the heat transfer coefficient is similar, so the overall heat transfer efficiency is notably improved.

Key words: packed bed, grille-support, flow, heat transfer, numerical simulation

摘要：

颗粒堆积床作为反应器和分离器等的重要组成广泛应用于实际化学工业生产中。基于传统的有序堆积结构，提出了一种新型格栅支撑有序堆积结构，通过采用新型格栅支撑结构可以快速构建有序颗粒堆积床，其中包括格栅支撑简单立方、格栅支撑体心立方、格栅支撑疏松面心立方和格栅支撑密实面心立方颗粒堆积结构。对4种颗粒堆积单元通道内的流动换热进行模拟研究后发现，不同堆积形式的格栅支撑颗粒堆积床流动换热性能不同；在相同的面心立方堆积形式下，使用不同的格栅支撑结构，其流动传热也有明显差异；与传统有序堆积结构相比，在换热相差不多的情况下，格栅支撑有序堆积结构的压降减小，所以其综合换热效率有明显提升。

关键词: 填充床, 格栅支撑, 流动, 传热, 数值模拟

CLC Number:

TK 124

Shang ZHANG, Jian YANG, Qiuwang WANG. Numerical study on fluid flow and heat transfer in grille-support structured packed beds[J]. CIESC Journal, 2020, 71(S2): 24-31.

张尚, 杨剑, 王秋旺. 新型格栅支撑有序堆积床内流动传热数值研究[J]. 化工学报, 2020, 71(S2): 24-31.

Figures/Tables 12

Fig.1 Schematic diagram of grille-support structured packed bed of G-CFCC and grille plate

Fig.2 Different packed cells of grille-support structured packed beds

Table 1 Geometry parameters for physical models

堆积形式	s/mm	w/mm	h/mm	δ/mm	D₁/mm	D₂/mm	?	d_p/mm
G-SC	12.1	12.1	12.1	0.4	9.6	—	0.458	12
G-BCC	13.8	13.8	15.2	0.4	9.6	—	0.391	12
G-LFCC	20.0	20.0	15.2	0.4	9.6	—	0.397	12
G-CFCC	17.6	17.6	17.6	0.4	9.6	7.2	0.337	12

Fig.3 Different packed channels

Fig.4 Physical model of computational domain used for the simulation

Fig.5 Validation of pressure drop and Nusselt number

Fig.6 Meshing independence validation

Fig.7 Local streamline distributions in different grille-support packed beds (v=1 m/s)

Fig.8 Variations of pressure drops and friction factors for different packing forms

Table 2 Predicted values of correlation constant

堆积模型	?	c₁	c₂	a₁	a₂	n
SC^[8]	0.477	163.46	0.74	1.73	0.2	0.7
BCC^[8]	0.321	160	0.61	2.1	0.46	0.63
FCC^[8]	0.260	174	0.615	1.8	0.54	0.67
G-SC	0.458	246.05	0.38	1.3	0.10	0.78
G-BCC	0.391	223.56	0.36	2.5	0.13	0.80
G-LFCC	0.397	193.72	0.3	2.6	0.16	0.77
G-CFCC	0.337	344.92	0.45	3.0	0.24	0.77

Fig.9 Comparison of Nusselt number in different packed beds

Fig.10 Variations of overall heat transfer efficiency for different packed beds

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