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Effect of circulating working fluids on performance of LNG cold energy power generation systems
- Low-carbon Chemistry and Chemical Engineering Vol. 49, Issue 10, Pages: 119-128(2024)
- 作者机构：
1.国家管网集团工程技术创新有限公司,天津 300450
2.大连理工大学 化工学院 化工机械与安全系, 辽宁 大连 116012
- 作者简介：
- 基金信息：
DOI：10.12434/j.issn.2097-2547.20230355
CLC： TE09;TM619Published：25 October 2024，
Received：29 October 2023，
Revised：12 December 2023，
- 稿件说明：
移动端阅览
王荧光,蔡东旭,梁勇等.循环工质对LNG冷能发电系统性能的影响[J].低碳化学与化工,2024,49(10):119-128.
WANG Yingguang,CAI Dongxu,LIANG Yong,et al.Effect of circulating working fluids on performance of LNG cold energy power generation systems[J].Low-carbon Chemistry and Chemical Engineering,2024,49(10):119-128.
王荧光,蔡东旭,梁勇等.循环工质对LNG冷能发电系统性能的影响[J].低碳化学与化工,2024,49(10):119-128. DOI： 10.12434/j.issn.2097-2547.20230355.
WANG Yingguang,CAI Dongxu,LIANG Yong,et al.Effect of circulating working fluids on performance of LNG cold energy power generation systems[J].Low-carbon Chemistry and Chemical Engineering,2024,49(10):119-128. DOI： 10.12434/j.issn.2097-2547.20230355.
摘要
朗肯循环可将液化天然气（LNG）冷量㶲转化为电能，是一种有效的冷能回收利用技术。结合工程实际，将LNG冷能发电系统内最低压力设置为高于常压，探究了循环工质对系统性能的影响。将7种常用工质作为备选，以系统净输出功最大为目标函数，在相同工况下对单级联合循环（CC）、串联联合循环（CCC）和并联联合循环（PCC）3种常见的LNG冷能发电系统进行了优化。分析了选择不同工质时系统性能的差异及其原因，探究了有无直接膨胀过程对工质选择的影响。结果表明，CC、CCC和PCC系统的最优工质分别为CH
2
F
2
、C
2
H
6
+ C
3
H
8
和C
2
H
4
+ C
3
H
8
。选择最优工质情况下，CCC系统通过对LNG冷能的有效分段利用，减少了系统内的不可逆㶲损失，所以性能相对最优，其热效率相比CC和PCC系统分别提升了54.8%和35.4%，且所需换热面积并未显著增加。有无直接膨胀不影响系统内工质选择，但无直接膨胀会导致最大系统净输出功略有降低。
Abstract
The Rankine cycle can convert liquefied natural gas (LNG) cold energy into electrical energy
which is an effective cold energy recovery and utilization technology. Based on engineering practice
the lowest pressure in the LNG cold energy power generation system was set to be higher than normal pressure
and the effect of circulating working fluids on system performance was explored. Seven commonly used working fluids were selected as candidates
with the objective function of maximizing the net output power of the system. Under the same operating conditions
three common cold energy power generation systems
namely single-stage combined cycle (CC)
cascade combined cycle (CCC) and parallel combined cycle (PCC)
were optimized. The differences in system performance and their reasons when selecting different working fluids were analyzed
and the effect of direct expansion process on working fluid selection was explored. The results show that the optimal working fluids for CC
CCC and PCC s
ystems are CH
2
F
2
C
2
H
6
+ C
3
H
8
and C
2
H
4
+ C
3
H
8
respectively. When selecting the optimal working fluid
the CCC system reduces irreversible energy loss within the system by effectively segmenting the utilization of LNG cold energy
resulting in relatively optimal performance. Compared with CC and PCC systems
the thermal efficiency of CCC system increases by 54.8% and 35.4%
and the required heat exchange area does not significantly increase. The presence or absence of direct expansion does not affect the selection of working fluids within the system
while the absence of direct expansion can lead to a slight decrease in the maximum net output power of the system.
关键词
LNG冷能发电遗传算法优化朗肯循环工质选择系统性能对比直接膨胀
Keywords
LNG cold energy power generationgenetic algorithm optimizationRankine cycleworking fluid selectionsystem performance comparisondirect expansion
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