Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (5): 64-71.doi: 10.6040/j.issn.1672-3961.0.2019.156

• Energy and Power Engineering—Special Topic on Refrigeration Technology • Previous Articles     Next Articles

Thermodynamic characteristic analysis of power and cooling system drived by SOFC

Hanbing WANG1(),Xiaohui LIU2,Minli TIAN1,Guihua WANG1,Zeting YU1,*(),Shaobo JI1   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Weichai Power Co., Ltd., Weifang 261061, Shandong, China
  • Received:2019-04-11 Online:2019-10-20 Published:2019-10-18
  • Contact: Zeting YU E-mail:1505369363@qq.com;yuzt@sdu.edu.cn
  • Supported by:
    国家重点研发计划项目;山东省自然科学基金资助项目(ZR2019MEE045)

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Abstract:

In order to improve the energy utilization efficiency of a solid oxide fuel cell, a combined power and cooling system which integrated a solid oxide fuel cell, a gas turbine and an absorption chiller was proposed. A mathematical model was developed, and the thermodynamic parameters of the system were given to study the system performance under steady-state conditions. Results showed that, under the given conditions, the SOFC electrical efficiency, the total electrical efficiency of combined system and the power-cooling efficiency were 46.81%, 54.53% and 72.24%, respectively. When the SOFC inlet temperature was 620 ℃, the maximum total electrical efficiency of combined system and the maximum power-cooling efficiency were obtained 54.66% and 72.42%, respectively. When the inlet temperature of fuel cell was 600 ℃, the cooling capacity of the combined supply system was the largest.

Key words: SOFC, absorption refrigeration, thermal performance, combined power and cooling

CLC Number: 

  • TM911

Fig.1

Schematic diagram of power-cooling combined supply system based on SOFC-GT and absorption chiller"

Table 1

Coefficient of chemical equilibrium constants"

常数 A/10-12 B/10-8 C/10-6 D/10-2 E
置换反应 5.47 -2.574 4.637 -3.915 13.209 7
重整反应 -26.31 12.406 -225.232 19.503 -66.139 5

Table 2

Comparison of output voltage"

电流密度/(A·cm-2) 电压/V 误差/%
文献[19] 本研究
0.1 0.860 0.859 -0.13
0.2 0.760 0.792 4.21
0.3 0.680 0.723 6.35
0.4 0.620 0.653 5.39
0.5 0.570 0.582 2.11
0.6 0.520 0.507 -2.60

Table 3

Polarization overvoltage parameters"

阳极交换电流密度
j0, a/(kA·cm-2)		 阴极交换电流密度
j0, a/(kA·m-2)		 阳极有效气体扩散系数
Daeff/(cm2·s-1)		 阴极有效气体扩散系数
Dceff/(cm2·s-1)		 阳极厚度La/μm 阴极厚度Lc/μm 连接体厚度Lint/μm 电解质厚度Le/μm 阳极电导率ρa 阴极电导率ρc 电解质电导率ρe 连接体电导率ρint
6.5 2.5 0.2 0.05 500 50 500 10 (9.5×107/T×exp(-1 150/T))-1 (4.2×107/T×exp(-1 200/T))-1 (3.34×104/T×exp(-10 300/T))-1 (9.3×106/T×exp(-1 100/T))-1

Table 4

Input parameters of the combined supply system"

环境温度/℃ 环境压力/kPa SOFC进出口温差/℃ 燃料利用率 蒸汽碳比 SOFC进口温度/℃ 电流密度/(A·cm-2) 压缩机等熵效率 燃气轮机及透平等熵效率 泵等熵效率 后燃室燃烧效率 电流转换器效率 单电池个数 单电池面积/cm2 压缩机压比 制冷循环高压/kPa 制冷循环低压/kPa 精馏器出口氨浓度
25 101.3 100 0.85 2.5 600 0.6 0.8 0.8 0.8 0.95 0.92 1 000 100 8 1 202 300 0.999 6

Table 5

Performance calculation results of combined power supply system"

电压/V SOFC输出功/kW 燃气轮机输出功/kW 透平输出功/kW 联供系统对外输出净功/kW 制冷量输出/kW 功冷比 吸收式制冷机制冷系数COP SOFC发电效率/% 联供系统总发电效率/% 功冷联供效率/%
0.622 1 34 341 22 013 41 714 40 013 12 989 3.081 0.479 46.81 54.54 72.24

Fig.2

Effect of steam carbon ratio on output voltage of combined power supply system"

Fig.3

Effects of steam-carbon ratio on input or output power and air mass flow of combined power supply system"

Fig.4

Effect of steam-carbon ratio on efficiency and powercooling ratio of combined power supply system"

Fig.5

The influence of fuel cell inlet temperature on output voltage of combined power supply system"

Fig.6

The influence of fuel cell inlet temperature on the input or output power and air mass flow of the combined power supply system"

Fig.7

Effect of inlet temperature of fuel cell on efficiency and power-cooling ratio of cogeneration system"

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