Study on performance of improved three-stage cascade multi-stream system for LNG cold energy power generation

CAI Dongxu; WANG Yingguang; LIU Haoshuang; HU Dapeng

doi:10.12434/j.issn.2097-2547.20230394

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Study on performance of improved three-stage cascade multi-stream system for LNG cold energy power generation

- Study on performance of improved three-stage cascade multi-stream system for LNG cold energy power generation
- Vol. 49, Issue 11, Pages: 122-132(2024)
- 作者机构：
  
  1.大连理工大学化工学院化工机械与安全系，辽宁大连 116012
  2.国家管网集团工程技术创新有限公司，天津 300450
  3.大连理工大学精细化工国家重点实验室，智能材料化工前沿科学中心，辽宁大连 116012
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20230394
  CLC： TE09;TK513
- Published：25 November 2024，
  
  Received：03 December 2023，
  
  Revised：19 January 2024，
- 稿件说明：
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蔡东旭,王荧光,刘豪爽等.改进型三级串联多股流LNG冷能发电系统性能研究[J].低碳化学与化工,2024,49(11):122-132.

CAI Dongxu,WANG Yingguang,LIU Haoshuang,et al.Study on performance of improved three-stage cascade multi-stream system for LNG cold energy power generation[J].Low-carbon Chemistry and Chemical Engineering,2024,49(11):122-132.
蔡东旭,王荧光,刘豪爽等.改进型三级串联多股流LNG冷能发电系统性能研究[J].低碳化学与化工,2024,49(11):122-132. DOI： 10.12434/j.issn.2097-2547.20230394.

CAI Dongxu,WANG Yingguang,LIU Haoshuang,et al.Study on performance of improved three-stage cascade multi-stream system for LNG cold energy power generation[J].Low-carbon Chemistry and Chemical Engineering,2024,49(11):122-132. DOI： 10.12434/j.issn.2097-2547.20230394.

摘要

针对常见的三级串联朗肯循环液化天然气（LNG）冷能发电系统未能有效地利用工质冷量的问题，提出了一种改进型三级串联多股流联合循环（MS-3CC）系统。通过加入多股流换热器，该系统多级利用了LNG和系统内循环工质冷量，有效降低了系统复杂程度，提升了系统热力学性能和经济性。通过遗传算法优化计算，当天然气（NG）排气压力为5.5 MPa、系统内各级循环工质均选取丙烷时，MS-3CC系统的最大净输出功为6027 kW，相比三级串并联合循环（P-3CC）系统和单级联合循环（SCC）系统分别提高了5.4%和80

.3%

，

而其年净收益则分别提高了16.9%和68.0%。比较了64种工质组合，发现采用CH

+ CH

+ C

时MS-3CC系统的净输出功最高。MS-3CC系统的提出为实际工业中更为有效地多级利用LNG冷量提供了参考。

Abstract

The conventional three-stage cascade Rankine cycle system for liquefie natural gas (LNG) cold energy power generation fails to effectively utilize the working fluid’s cold energy

therefore an improved multi-stream three-stage cascade combined cycle (MS-3CC) system was proposed. By adding a multi-stream heat exchanger

the system can utilize the cold energy of LNG and working fluid in multiple stages

effectively reducing the complexity of the system and improving its thermodynamic performance and economy. Through genetic algorithm optimization calculation

when the exhaust pressure of natural gas (NG) is 5.5 MPa

and the working fluid is selected as propane in all syetems

the maximum net output power of the MS-3CC system is 6027 kW

which is 5.4% and 80.3% higher than that of the parallel three-stage cascade combined cycle (P-3CC) system and single-stage combined cycle (SCC) system

respectively

and its annual total net income increases by 16.9% and 68.0%

respectively. Comparing 64 working fluid combinations

it is found that the net output power of the MS-3CC system is highest when using CH

+ CH

+ C

. The proposal of MS-3CC system provides a reference for more effective multi-stage utilization of LNG cold energy in industrial practice.

关键词

LNG冷能发电三级朗肯循环多股流换热经济性分析工质选择遗传算法

Keywords

LNG cold energy power generationthree-stage Rankine cyclemulti-stream heat exchangeeconomic analysisworking fluid selectiongenetic algorithm

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Related Author

HU Dapeng

WANG Yingguang

CAI Dongxu

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Related Institution

China Petroleum Tarim Oilfield Company, Tarim

School of Petroleum and Natural Gas Engineering, Southwest Petroleum University

School of Civil Engineering, University of Science and Technology Liaoning

North China Municipal Engineering Desing & Research Insititute Co., Ltd., Hefei Branch

College of Pipeline and Civil Engineering,China University of Petroleum (Huadong)

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