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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (5): 64-71.doi: 10.6040/j.issn.1672-3961.0.2019.156

• 能源与动力工程——制冷技术专题 • 上一篇    下一篇

基于SOFC的功冷联供系统热力学特性分析

王寒冰1(),刘晓辉2,田民丽1,王桂华1,于泽庭1,*(),纪少波1   

  1. 1. 山东大学能源与动力工程学院, 山东 济南 250061
    2. 潍柴动力股份有限公司, 山东 潍坊 261061
  • 收稿日期:2019-04-11 出版日期:2019-10-20 发布日期:2019-10-18
  • 通讯作者: 于泽庭 E-mail:1505369363@qq.com;yuzt@sdu.edu.cn
  • 作者简介:王寒冰(1995—),男,四川南充人，硕士研究生,主要研究方向为燃料电池与余热利用. E-mail: 1505369363@qq.com
  • 基金资助:
    国家重点研发计划项目;山东省自然科学基金资助项目(ZR2019MEE045)

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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摘要：

为提高固体燃料电池(solid oxide fuel cell, SOFC)的能源综合利用效率,提出一种基于SOFC循环、燃气轮机和吸收式制冷机的功冷联供系统。建立联供系统的热力学模型,给出设计工况下的热力学参数,对联供系统进行模拟分析。结果表明,在设计工况下,燃料电池发电效率、联供系统总发电效率和功冷联供效率分别为46.81%、54.53%和72.24%。燃料电池进口温度为620 ℃时,联供系统取得最大总发电效率和功冷联供效率,分别为54.66%和72.42%;在燃料电池进口温度为600 ℃时,联供系统输出制冷量最多。

关键词: 固体氧化物燃料电池, 吸收式制冷, 热力性能, 功冷联供

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

中图分类号: 

  • TM911

图1

基于SOFC-GT以及吸收式制冷机的功冷联供系统示意图 C1—燃料压缩机; C2—空气压缩机; P1—泵1;M—混合器; Ref—预重整器; AB—后燃室; GT—燃气轮机; T—透平; PH1—预热换热器1;PH2—预热换热器2;PH3—预热换热器3; PH4—预热换热器4;P2—泵2;R—回热器; G—蒸汽发生器; Rec—精馏塔; Con—冷凝器; Eva—蒸发器; Abs—吸收器; V1—膨胀阀1;V2—膨胀阀2 "

表1

化学平衡常数系数"

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

表2

输出电压对比"

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

表3

极化过电压参数"

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

表4

联供系统输入参数"

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

表5

联供系统性能计算结果"

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

图2

蒸汽碳比对联供系统输出电压的影响"

图3

蒸汽碳比对联供系统输入或输出功及空气质量流量的影响"

图4

蒸汽碳比对联供系统效率及功冷比的影响"

图5

燃料电池进口温度对联供系统输出电压的影响"

图6

燃料电池进口温度对联供系统输入或输出功及空气质量流量的影响"

图7

燃料电池进口温度对联供系统效率及功冷比的影响"

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