A Combined Cooling and Power System of Supercritical/Transcritical CO<sub>2</sub> Cycle with Liquefied Natural Gas as Cool Source

doi:10.7652/xjtuxb201509011

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A Combined Cooling and Power System of Supercritical/Transcritical CO₂ Cycle with Liquefied Natural Gas as Cool Source

更新时间：2025-07-09

- A Combined Cooling and Power System of Supercritical/Transcritical CO₂ Cycle with Liquefied Natural Gas as Cool Source
- Vol. 49, Issue 9, Pages: 58-62+146(2015)
- 作者机构：
  
  西安交通大学叶轮机械研究所,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201509011
  CLC： TK11
- Online First：10 September 2015，
  
  Published：2015
- 稿件说明：
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A Combined Cooling and Power System of Supercritical/Transcritical CO₂ Cycle with Liquefied Natural Gas as Cool Source[J]. 2015, 49(9): 58-62+146. DOI: 10.7652/xjtuxb201509011.
DOI：

A Combined Cooling and Power System of Supercritical/Transcritical CO₂ Cycle with Liquefied Natural Gas as Cool Source[J]. 2015, 49(9): 58-62+146. DOI: 10.7652/xjtuxb201509011. DOI：

摘要

为了提高超临界CO

布雷顿循环(SCO

循环)的低温余热回收效率

采用跨临界CO

循环(TCO

循环)作为底循环对再压缩式SCO

循环进行余热回收

并采用液化天然气(LNG)为冷源对工质进行冷凝

建立了以LNG为冷源的再压缩式SCO

-TCO

冷电联供系统

以同时输出电量和制冷量。对系统进行火用分析比较

并研究了关键热力参数对系统净输出功率、制冷量、系统热效率和系统火用效率的影响。结果显示:使用LNG作为冷源

降低了TCO

循环的冷凝温度

提高了低温回收热效率

系统的热效率(动力)在给定的条件下达到54.47%; 提高LNG的入口温度

可以减小系统火用损; 高温回热器换热效率增加

系统热效率和火用效率均增加; SCO

透平膨胀比增加

系统热效率降低

但火用效率增加; TCO

透平进口压力升高

系统热效率和火用效率均呈现先减小再升高后减小的变化趋势; 随着冷凝温度升高

系统热效率降低

但火用效率先减小后增加。

Abstract

To improve the efficiency of low-temperature waste heat recovery for the supercritical CO

Brayton cycle(SCO

cycle)

a cooling and power system combining recompression SCO

cycle with transcritical CO

cycle(TCO

cycle)and with liquefied natural gas as the heat sink was established to yield electricity and cold capacity. A TCO

cycle was employed as a bottoming cycle to recover the waste heat in the topping recompression SCO

cycle

and liquefie

d natural gas(LNG)was adopted to condense the CO

in the TCO

cycle to improve the heat recovery efficiency. Exergy analysis was performed and the effects of several key thermodynamic parameters on the system performance were examined according to the performance criteria

including net power output

refrigeration output

overall cycle thermal efficiency and exergy efficiency. The results show that the lower condensation temperature in the TCO

cycle could improve the heat recovery efficiency

with the thermal efficiency of 54.47% under given conditions when LNG was adopted as heat sink. Moreover

an increase in the LNG inlet temperature can lead to a reduction in exergy loss of the system. Furthermore

both thermal and exergy efficiency increase when the high-temperature recuperator efficiency increases; when the SCO

turbine expansion ratio increases

the thermal efficiency declines while exergy efficiency increases; with the increase of TCO

turbine inlet pressure

both thermal and exergy efficiency increase first

and then declines and increases at last; as the condensation temperature increases

the thermal efficiency deceases and exergy efficiency increases firstly and then declines.

关键词

Keywords

references

王江峰. 基于有机工质的中低温热源利用方法及其热力系统集成研究 [D]. 西安: 西安交通大学, 2010.

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LIN Wensheng, HUANG Meibin, HE Hongming, et al. A transcritical CO2 Rankine cycle with LNG cold energy utilization and liquefaction of CO2 in gas turbine exhaust [J]. ASME Journal of Energy Resources, 2009, 131(4): 042201.

WANG Xurong, WU Yi, WANG Jiangfeng, et al. Thermo-economic analysis of a recompression supercritical CO2 cycle combined with a transcritical CO2 cycle [C]∥ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. New York, USA: ASME, 2015: GT2015-42033.

ZHANG N, LIOR N. A novel near-zero CO2 emission thermal cycle with LNG cryogenic exergy utilization [J]. Energy, 2006, 31(10/11): 1666-1679.

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A Combined Cooling and Power System of Supercritical/Transcritical CO2 Cycle with Liquefied Natural Gas as Cool Source

DOI：10.7652/xjtuxb201509011

摘要

Abstract

关键词

Keywords

references

A Combined Cooling and Power System of Supercritical/Transcritical CO₂ Cycle with Liquefied Natural Gas as Cool Source