Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (2): 434-443.doi: 10.13229/j.cnki.jdxbgxb.20230462

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Experimental study of a combustor-coupled heat exchanger for compact SOFC system

Si-yuan LI1(),Shu-zhan BAI1(),Guo-xiang LI1,Kong-rong MA2,Wen-cong LI2,Yu-hao HAN1   

  1. 1.School of Energy and Power Engineering,Shandong University,Jinan 250061,China
    2.China National Heavy Duty Truck Group Co. ,Ltd. ,Jinan 250000,China
  • Received:2023-05-10 Online:2025-02-01 Published:2025-04-16
  • Contact: Shu-zhan BAI E-mail:lisiyuan@sdu.edu.cn;baishuzhan@sdu.edu.cn

Abstract:

The catalytic burner and heat exchanger in the peripheral thermal management system of a compact solid oxide fuel cell are coupled into a catalytic heat exchanger (CHE). The thermal performance of the CHE and the catalytic conversion of methane were investigated experimentally. The performance of the CHE was tested, compared and analysed when only catalytic combustion or heat exchange was taking place, compared to the performance during normal operation. The results show that the heat transfer efficiency of the CHE in normal operation is 10% higher than when only heat exchange is carried out, while the catalytic conversion of methane is 4% lower than when only catalytic reaction is carried out. Although CHE reduces some of the catalytic conversion performance, it improves fuel utilisation, so using CHE to replace the burner and heat exchanger in a system can improve heat transfer performance, speed up system start-up or be more fuel efficient for the same start-up time, save manufacturing costs and system space, and reduce the heat load on the remaining thermal components. Potential applicability and broad prospects in compact SOFC systems.

Key words: heat exchange, catalytic combustion, coupling, solid oxide fuel cell, heat exchange efficiency, thermal management system

CLC Number: 

  • TK91

Fig.1

Schematic diagram of internal structure of heat exchanger"

Fig.2

Experimental system"

Fig.3

CHE clow channel schematics"

Table 1

Experimental setup of the effect of reaction time on catalytic conversion"

模式

热侧空气流量

/(g·min-1

热侧空气

温度/K

CH4 流量

/(g·min-1

时间

/min

CCO1526701.80~5
CCO1527201.80~5
CCO1527701.80~5
CCO1528201.80~5
CCO1528701.80~5
CCO1529201.80~5

Fig.4

Effect of reaction time on CH4 catalytic conversion"

Table 2

Experimental setup of the effect of fuel concentration on catalytic conversion"

模式

热侧空气流量

/(g·min-1

热侧空气

温度/K

CH4流量

/(g·min-1

CCO1507201.7,2.6,3.5,4.4
CCO1507701.7,2.6,3.5,4.4
CCO1508201.7,2.6,3.5,4.4
CCO1508701.7,2.6,3.5,4.4
CCO1529201.7,2.6,3.5,4.4

Fig. 5

Effect of fuel concentration on CH4 catalytic conversion"

Fig.6

Concept diagram of SOFC system warmup (first stage)"

Table 3

Experimental setup of CHE catalytic conversion performance"

模式热侧空气流量/(g·min-1热侧空气温度/KCH4流量/(g·min-1冷侧空气流量/(g·min-1时间/min
CCO1527702.6/0~30
CHE1527702.61500~30
CCO1528802.6/0~30
CHE1528802.61500~30

Fig.7

Change of catalytic conversion of CH4 with time"

Fig.8

Change of exhaust gas temperature with time"

Fig.9

Change of inner wall temperature of CHE with time"

Fig.10

Carbon deposition on catalyst sample surface"

Fig.11

Change of heat exchange efficiency with time"

Fig.12

Change of cold side outlet temperature with time"

Fig.13

Nusselt number with respect to the reynolds number for the CHE and CPFHE"

Table 4

Properties of hot-side mixture after CHE full development"

参数数值
ρ/(kg·m-30.319
μ/(Pa·s)4.516×10-5
μw/Pa·s4.115×10-5
β45°
Pr0.714

Fig.14

Relation of NO x emission with time"

Fig.15

Relation of CO emission with time"

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