Journal of Shandong University(Engineering Science) ›› 2019, Vol. 49 ›› Issue (5): 52-57.doi: 10.6040/j.issn.1672-3961.0.2019.154

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

TRCC series system based on LNG cold energy and fuel cellwaste heat utilization

Yinglun GUO1(),Fuqiang XI2,Ruizhi SU1,Guoxiang LI1,Zeting YU1,*()   

  1. 1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
    2. Weichai Power Co. Ltd., Weifang 261061, Shandong, China
  • Received:2019-04-02 Online:2019-10-20 Published:2019-10-18
  • Contact: Zeting YU E-mail:yinglun0408@163.com;yuzt@sdu.edu.cn
  • Supported by:
    国家重点研发计划项目(面向重型载货车用燃料电池发动机集成与控制)

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Abstract:

A cogeneration system based on solid oxide fuel cell (SOFC for short) and transcritical carbon dioxide cycle (TRCC for short) was proposed. The transcritial carbon dioxide cycle was used to recover the exhaust heat of the SOFC while utilizing the LNG refrigeration capacity. The mathematical model of the system was established, and the influence of parameter changes on system performance was analyzed. The results showed that under the design conditions, the thermal efficiencies of SOFC, TRCC, and the whole system were 64.2%, 22.4%, and 74.1%, respectively. The system thermal efficiency increased with the inlet temperature of the fuel cell and decreased with the increase of the steam-carbon ratio. The thermal efficiency increased as the turbine inlet pressure to the TRCC increased.

Key words: solid oxide fuel cell, transcritical carbon dioxide cycle, thermal efficiency, LNG exergy

CLC Number: 

  • TM911

Fig.1

Schematic process flow diagram of the wasteheat drive system"

Table 1

Assumed input parameters for simulation"

参数 取值
环境温度/℃ 25
环境压力/kPa 101.3
水碳比 2.5
燃料电池入口温度/℃ 500
电池数 5 000
透平等熵效率 0.8
泵等熵效率 0.8
燃料利用率 0.85
换热器热端端差温度/℃ 30
TRCC循环低压/kPa 4 000
TRCC循环高压/kPa 20 000
LNG输入质量流量/(kg/s) 100
LNG初始温度/℃ -161.5
LNG初始压力/kPa 101.3
LNG泵出口压力/kPa 6 000

Table 2

Results of simulation for the combined cycle"

参数点 压力/kPa 温度/℃
1 101.3 25.0
2 800.0 221.7
3 101.3 25.0
4 800.0 217.8
5 101.3 25.0
6 800.0 25.1
7 800.0 241.7
8 800.0 281.5
9 800.0 255.9
10 800.0 500.0
11 800.0 650.0
12 800.0 650.0
13 800.0 809.6
14 101.3 462.5
15 101.3 295.7
16 101.3 294.0
17 101.3 282.5
18 101.3 100.0
19 20 000.0 252.5
20 4 000.0 120.2
21 4 000.0 37.6
22 4 000.0 5.3
23 20 000.0 20.5
24 20 000.0 61.3
25 101.4 -161.5
26 6 000.0 -160.0
27 6 000.0 129.7
28 6 000.0 25.0
29 4 000.0 -17.9
30 4 000.0 5.3

Table 3

Performance of the combined cycle"

参数 计算值
燃料压缩机耗功/kW 3 999.0
空气压缩机耗功/kW 209 412.0
燃气轮机输出功/kW 300 030.0
SOFC泵耗功/kW 2.3
CO2透平输出功/kW 41 202.0
CO2泵耗功/kW 9 166.0
LNG泵耗功/kW 1 391.0
LNG膨胀机输出功/kW 8 811.0
系统净输出功/kW 294 537.0
SOFC热效率 0.642
CO2循环热效率 0.224
系统热效率 0.741

Fig.2

Effect of inlet temperature on the SOFC system"

Fig.3

Effect of fuel cell steam-to-carbon ratio on the system performances"

Fig.4

Effect of TRCC high pressure on the series system"

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