Research on cold energy cascade utilization process design and energy efficiency optimization for Huaying LNG receiving station

黄华; 周万伟; 季炫宇; 袁志超; 周雄; 欧阳顺; 李巳聪; 杨鲁

doi:10.19666/j.rlfd.202502121

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Research on cold energy cascade utilization process design and energy efficiency optimization for Huaying LNG receiving station

Thermal Power Generation Vol. 54, Issue 11, Pages: 49-57(2025)

更新时间：2026-08-11

- Research on cold energy cascade utilization process design and energy efficiency optimization for Huaying LNG receiving station
- 作者机构：
  
  1. 华瀛天然气股份有限公司
  2. 重庆科技大学资源循环利用与碳中和技术研究院
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202502121
  CLC： TM619;TE974
- Published：2025
- 稿件说明：
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[1]黄华,周万伟,季炫宇,等.华瀛液化天然气接收站冷能梯级利用工艺设计及能效优化[J],2025,54(11):49-57.
[1]黄华,周万伟,季炫宇,等.华瀛液化天然气接收站冷能梯级利用工艺设计及能效优化[J],2025,54(11):49-57. DOI： 10.19666/j.rlfd.202502121.

DOI：10.19666/j.rlfd.202502121.

摘要

基于广东华瀛液化天然气(LNG)接收站的设计运行条件和周边产业环境，首先设计了一套热机循环发电耦合浅冷冻库的LNG冷能梯级利用方案，并采用专业软件HYSYS建模求解流程中的关键参数，以提升能效和大规模消纳冷能为目标，对原有方案进一步优化改进。结果表明：在全年最低气化日LNG外输量为228 t/h的条件下，原方案采用一级热机循环与冻库结合，年发电量超过3 283×10

k W·h，并满足了7 500 m

冻库的冷负荷需求；而优化设计后的新方案采用“两级热机循环-浅冷冻库”设计，通过提升热源温度，并改用质量分数40%乙烷和60%丙烷的混合工质，使热机循环系统的设计年发电量可提升至6 204×10

kW·h，单位质量LNG的净发电量从原先的17.54(kW·h)/t增加到33.02(kW·h)/t，还可节约约5 364.1万元/年电费。尽管多级的热机循环能够减少温差造成的不可逆损失，但考虑投入产出比及运行可靠性等因素，第二方案能与华瀛LNG接收站实际条件紧密结合，具有较好的工程可行性和经济性。上述2种冷能梯级利用设计方案各有优势，适用于接收站的不同发展阶段和LNG冷能利用的不同评价指标，为华瀛LNG接收站全面投产后的冷能利用提供了有益参考。

Abstract

Based on the design and operational conditions of Guangdong Huaying LNG Terminal and its surrounding industrial environment

a cascade utilization scheme integrating thermodynamic power generation with shallow cold storage was developed. Moreover

key process parameters were modeled and solved using HYSYS software to enhance energy efficiency and maximize cold energy utilization. The results show t

hat

under the condition of minimum daily send-out(228 t/h)

the original single-stage thermodynamic cycle coupled with cold storage achieved an annual power generation exceeding 32.83 GW·h while meeting the cooling demand of a 7 500 m

cold storage facility. The optimized scheme adopts a two-stage thermodynamic cycle with shallow cold storage

via employing a 40%(weight percentage) ethane and 60%(weight percentage) propane mixed working fluid

and elevating heat source temperature

this improved design increased the annual power generation to 62.04 GW·h

and raised the net power output per unit mass of LNG from 17.54(k W·h)/t to 33.02(kW·h)/t

with estimated annual electricity cost savings of approximately 53.641 million yuan. Although multi-stage heat engine cycles can reduce irreversible losses caused by temperature differences

considering factors such as cost-benefit ratio and operational reliability

the second scheme demonstrates strong engineering feasibility and economic viability by closely aligning with the actual conditions of the Huaying LNG Receiving Terminal. Both cascade utilization designs demonstrate distinct advantages for different development stages of the receiving terminal and different evaluation indicators for LNG cold energy utilization

providing valuable references for post-commissioning cold energy applications.

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