LNG冷能用于废气回流朗肯循环及CO2液化新工艺
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作者单位:

1.长江大学石油工程学院;2.中海油江苏天然气有限责任公司

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中图分类号:

TE08

基金项目:

国家自然科学基金(51974033)、(52274060);长江人才计划领军人才项目(Yz2021239)资助


LNG cold energy is used in exhaust gas reflux Rankine cycle and CO2 liquefaction technology
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1.College of Petroleum Engineering, Yangtze University;2.CNOOC Jiangsu Natural Gas Co.Ltd.

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    摘要:

    为了有效利用液化天然气(Liquefied natural gas,LNG)的冷能并对燃气轮机废气中的CO2进行液化处理,提出了一种利用LNG冷能液化CO2及CO2动力循环的新工艺,该工艺在常规朗肯循环的基础上增加了再热循环和回热循环并且设置了多流股换热器。利用化工过程模拟软件对工艺流程进行模拟并且对回流温度、级间冷却温度和循环的最高温度和压力进行敏感性分析,得到最佳运行参数。采用?分析的方法,对系统的?效率、比功和CO2的液化率等系统评价指标进行分析计算,并与现有工艺进行对比分析,得到新工艺的?效率为54.16%,比功为335.9 kJ/kgLNG,CO2的液化率为0.6217 kg/kgLNG,可知新工艺的评价指标均优于现有工艺。并且以?效率最高为目标,液化后的CO2温度作为约束条件,采用Original优化模式对工艺流程的参数进行优化,优化后的?效率为54.28%,比功为337.5 kJ/kgLNG,系统性能进一步提升。

    Abstract:

    In order to effectively utilize(Liquefied natural gas,LNG) cold energy and liquefy CO2 in gas turbine exhaust gas, a new process of LNG cold energy to liquefy CO2 and CO2 power cycle was proposed. In this process, reheat cycle and regenerative cycle were added on the basis of conventional Rankine cycle, and multi-flow strand heat exchanger was set up. Chemical process simulation software was used to simulate the process flow and sensitivity analysis of reflux temperature, interstage cooling temperature and maximum circulating temperature and pressure was carried out to obtain the best operating parameters. Exergy efficiency, specific work and CO2 liquefaction rate of the system are analyzed and calculated by exergy analysis. Exergy efficiency of exergy is 54.16%, specific work is 335.9 kJ/kgLNG, and CO2 liquefaction rate is 0.6217 kg/kgLNG in a new process. The evaluation indexes of the new process are better than those of the existing process. As for the exergic efficiency, exergic efficiency of exergic is as the highest and the temperature of CO2 after liquefied is as the constraint condition, exergic efficiency of exergic is 54.28% and specific power is 337.5kJ /kgLNG, so the system performance is further improved.

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何卫宏,张引弟,李颖楠,等. LNG冷能用于废气回流朗肯循环及CO2液化新工艺[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-05-09
  • 最后修改日期:2024-07-01
  • 录用日期:2024-07-09
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