Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy

WANG Changshun; SONG Xinyang; YANG Fan; QIAO Yan; LI Yang; GAO Yue; LI Pengfei

doi:10.19666/j.rlfd.202403118

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Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy

Thermal Power Generation Vol. 53, Issue 11, Pages: 21-30(2024)

更新时间：2025-09-28

- Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy
- 作者机构：
  
  1. 辽宁石油化工大学石油天然气工程学院
  2. 朝阳红山化工有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202403118
  CLC： TE89;TK01
- Published：2024
- 稿件说明：
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WANG Changshun, SONG Xinyang, YANG Fan, et al. Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy[J]. Thermal Power Generation, 2024, 53(11): 21-30.
DOI：

WANG Changshun, SONG Xinyang, YANG Fan, et al. Thermal analysis and optimization of combined cooling, heating and power system using LNG cold energy[J]. Thermal Power Generation, 2024, 53(11): 21-30. DOI： 10.19666/j.rlfd.202403118.

摘要

为解决以甲烷作为燃料的固体氧化物电池余热利用、碳捕集以及液化天然气冷能利用问题，建立了一种新型的冷热电联供系统。该系统包括改进再压缩超临界混合工质布雷顿循环、跨临界CO_2回热朗肯循环和二级混合工质有机朗肯循环，对循环系统进行热力学分析、设备(火用)分析、经济成本分析，并利用遗传算法对系统参数进行多目标优化。仿真分析结果表明：提升改进再压缩超临界混合工质布雷顿循环的膨胀机入口压力、跨临界CO_2回热朗肯循环的膨胀机入口温度与二级朗肯循环中R14的质量分数可提升系统循环净功、热效率、(火用)效率并降低平均单位成本；在最优工况条件下，系统热效率、(火用)效率、平均单位成本分别为64.70%、47.85%、24.20美元/GJ。

Abstract

In order to solve the problems of waste heat utilization

carbon capture and liquid natural gas(LNG)cold energy utilization of solid oxide batteries fueled by methane

a new type of combined cooling

heating and power system was established. The system includes the improved recompression supercritical mixed working fluid Brayton cycle

the transcritical CO_2 heat recovery Rankine cycle and the secondary mixed working fluid organic Rankine cycle. The thermodynamic analysis

equipment exergy analysis

economic cost analysis of the circulation system

and the multi-objective optimization of the system by using the genetic algorithm in MATLAB. The results show that

increasing P1

T16 and the mass fraction of R14 in the second-stage Rankine cycle can improve the network

thermal efficiency

and exergy efficiency of the system

and reduce the average unit cost. P1 is the pressure at inlet the expander in the compressed supercritical mixed working fluid Brayton cycle

T16 is the inlet temperature of the expander in the transcritical CO_2 regenerative Rankine cycle. Under the optimal working conditions

the thermal efficiency

exergy efficiency and average unit cost of the system are 64.70%

47.85% and 24.20 dollars/GJ.

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