固体氧化物燃料电池热电联供系统设计

doi:10.3969/j.issn.2097-0706.2022.08.002

摘要/Abstract

摘要：

研究了一种利用Aspen Plus软件模拟固体氧化物燃料电池热电联供（SOFC-CHP）系统的方法,并以1 kW级系统为例进行了计算,该方法可用于快速判断不同燃料及电堆功率要求下的SOFC-CHP系统热电供应情况。试验结果表明,在理想状态下SOFC的净发电效率可达51%,热效率高达42%,CO₂排放摩尔分数高达70%。所提方法可极大缩短计算速度,对进一步优化系统效率很有帮助。

关键词: 固体氧化物燃料电池, 热电联供系统, 过程模拟, 热量传递, 电化学

Abstract:

The software Aspen Plus is taken to simulate a combined heating and power system integrated with solid oxide fuel cells（SOFC-CHP）. Taking a 1 kW SOFC-CHP system as an example,the simulation method can make quick judgement on the heat and power supply situations of the system with different fuels and under various load requirements. The test results show that in the ideal condition,the power generation efficiency of the SOFC can reach 51%,the thermal efficiency can peak at 42%,and the emitted CO₂ mole fraction can be 70%. This method can greatly shorten the calculation time and facilitate the efficiency improvement of the system.

Key words: solid oxide fuel cell, combined heating and power, process simulation, heat transfer, electrochemical

中图分类号:

TK01

罗丽琦, 王月, 钟海军, 李庆勋, 谢广元, 王绍荣. 固体氧化物燃料电池热电联供系统设计[J]. 综合智慧能源, 2022, 44(8): 25-32.

LUO Liqi, WANG Yue, ZHONG Haijun, LI Qingxun, XIE Guangyuan, WANG Shaorong. Design of the CHP system integrated with SOFC[J]. Integrated Intelligent Energy, 2022, 44(8): 25-32.

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输入参数	数值
空气摩尔流量/(mol·min^-1)	4.490
重整水蒸气摩尔流量/(mol·min^-1)	0.358
氧气摩尔流量/(mol·min^-1)	0.169
甲烷摩尔流量/(mol·min^-1)	0.143
纯水摩尔流量/(mol·min^-1)	0.810
自来水体积流量/(L·min^-1)	6
所需功率/kW	1
水碳摩尔比	2.5
空气过量系数	5
重整器重整比率	0.9
SOFC燃料利用率/%	70
燃烧器燃料利用率/%	100
电池入口温度/℃	700
燃料进气温度/℃	25
纯氧进气温度/℃	25
纯水进料温度/℃	25
自来水进料温度/℃	25

组件	Aspen Plus模块	描述
阳极	RGibbs	对电化学反应进行模拟
阴极	Sep	对电池中氧离子从阴极转向阳极进行模拟
重整器	RStoic	对重整反应和水气转化反应进行模拟
燃烧器	RStoic	对阳极尾气与纯氧的充分燃烧进行模拟
分离器	Sep	对水气分离进行模拟
换热器	Heater	对热流和冷流的热量交换进行模拟

输出结果	数值
电流/A	149 646.7
电压/V	0.71
SOFC输出功率/kW	1.08
热水量/kW	0.48
蒸汽量/kW	0.43
SOFC净发电效率/%	51
热水效率/%	22
蒸汽效率/%	20
系统热效率/%	42
系统综合能量利用率/%	93
CO₂排放摩尔分数/%	70

流股序号	温度/ ℃	摩尔焓/(kJ·mol^-1)	摩尔熵/ [kJ·(mol·K)^-1]	焓流量/kW	摩尔流量/ (mol·min^-1)
1	25.000	-74.540	-0.081	-0.178	0.143
2	281.314	-184.670	-0.028	-1.542	0.501
3	700.000	-165.863	-0.003	-1.385	0.501
4	699.596	-71.432	0.046	-0.903	0.758
5	858.573	-175.334	0.033	-2.300	0.787
6	1 031.476	-214.050	0.053	-6.264	1.756
7	802.714	-224.892	0.044	-6.581	1.756
8	685.197	-230.257	0.039	-6.738	1.756
9	622.448	-233.058	0.036	-6.820	1.756
10	93.759	-254.450	0.000	-7.446	1.756
11	60.000	-266.488	-0.035	-7.799	1.756
12	60.000	-264.308	0.010	-4.898	1.112
13	60.000	-264.308	0.010	-0.933	0.212
14	60.000	-264.308	0.010	-3.965	0.900
15	25.000	-0.009	0.004	-0.001	4.490
16	570.000	16.595	0.035	1.242	4.490
17	700.000	20.835	0.040	1.559	4.490
18	25.000	-287.741	-0.168	-3.885	0.810
19	91.840	-282.275	-0.151	-3.811	0.810
20	200.000	-235.893	-0.029	-3.185	0.810
21	200.000	-235.893	-0.029	-0.511	0.130
22	200.000	-235.893	-0.029	-2.673	0.680
23	400.000	-228.660	-0.017	-2.591	0.680
24	400.000	-228.660	-0.017	-1.227	0.322
25	400.000	-228.660	-0.017	-1.364	0.358
26	25.000	-287.741	-0.168	-1 594.1	332.410
27	25.780	-287.678	-0.168	-1 593.7	332.410
28	858.573	26.084	0.044	1.871	4.304
29	656.400	19.364	0.038	1.389	4.304
30	95.112	2.043	0.009	0.147	4.304
31	60.000	1.015	0.006	0.073	4.304
32	25.000	-0.010	-0.001	0.000	0.169