Modeling and Simulation of SOFC System with Heat Transfer among BoP Components

doi:10.16182/j.issn1004731x.joss.22-0281

Abstract

Abstract:

High temperature solid oxide fuel cell (SOFC) is a high temperature and efficient hydrogen-electric conversion device. Its high temperature operating environment puts forward higher requirements for thermal insulation of stack and balance of plants(BoP) in the system. In this paper, a lumped SOFC system model is established based on the thermal efficiency-heat transfer unit number method (ε-NTU method), in combination with limited measurable parameters for high-temperature system.Quantitative analysis of components temperature and heat transfer among components can be achieved by heat exchange simulation between components and BoP hot-box environment. A simple feedback controlleris designed for system self-starting and operation. Results show that the BoP hot-box plays the role of temperature balance, which is benefit for waste heat utilization by heating the inlet gas, and lower the highest equipment temperature for a longer system lifetime.

Key words: SOFC(solid oxide fuel cell), lumped model, heat transfer, thermal insulation, feedback control

CLC Number:

TP391.9

Ling Hong, Rongmin Wu, Jianwu Zhou, Tian Xia, Xiaojie Li, Pengjie Tian, Hao Peng, Chunhui Shou. Modeling and Simulation of SOFC System with Heat Transfer among BoP Components[J]. Journal of System Simulation, 2022, 34(7): 1383-1392.

Figures/Tables 12

Fig. 1

Fig. 2

Table 1

Symbol table

变量	含义
n/(mol·s^-1)	摩尔流量
Cp/J·(mol·K^-1)	比热容
q/(J·s^-1)	单位时间传热量
T/K	温度
C/(K·s)	热容量率
$Δ H$ /(J·mol^-1)	焓变
F/SLM	体积流量
k	传热系数
r	比例系数

Table 1

Table 2

Fig. 3

Table 3

Main model parameters

序号	主要参数	量值
1	电堆电池片数/片	300
2	周边环境温度/℃	25.00
3	环境换热效率 $k e n v$	0.20
4	汽化潜热温度/℃	108.74
5	汽化潜热焓值/kJ·mol^-1	2 311.50
6	重整器等效面积 $A b$ /m²	2.5
7	重整反应效率 $η S R$	0.68
8	换热器换热效率ε	0.80
9	燃气换热器等效面积 $A b$ /m²	1.0
10	空气换热器等效面积 $A b$ /m²	1.8

Table 3

Fig. 4

Fig. 5

Fig. 6

Fig. 7

Fig. 8

Fig. 9

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元素	比重
H₂	76
CO	9
CO₂	15
NH₃, CH₄, SO _x	少许

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