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CO_(2)进行液化处理,提出了一种利用LNG冷能液化CO_(2)及CO_(2)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(火用)分析的方法,对系统的(火用)效率、比功和CO_(2)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(火用)效率为54.16%,比功为335.9 kJ/kg LNG,CO_(2)的液化率为0.6217 kg/kg LNG,可知新工艺的评价指标均优于现有工艺。并且以(火用)效率最高为目标,液化后的CO_(2)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(火用)效率为54.28%,比功为337.5 kJ/kg LNG,系统性能进一步提升。
In order to effectively utilize LNG(liquefied natural gas)cold energy and liquefy CO_(2)in gas turbine exhaust gas,a new process of LNG cold energy to liquefy CO_(2)and CO_(2)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 CO_(2)liquefaction rate of the system were analyzed and calculated by exergy analysis.Exergy efficiency of exergy was 54.16%,specific work was 335.9 kJ/kg LNG,and CO_(2)liquefaction rate was 0.6217 kg/kg LNG in a new process.The evaluation indexes of the new process were better than those of the existing process.As for the exergic efficiency,exergic efficiency of exergic was as the highest and the temperature of CO_(2)after liquefied was as the constraint condition,exergic efficiency of exergic was 54.28%and specific power was 337.5 kJ/kg LNG,so the system performance was further improved.
作者
何卫宏
张引弟
李颖楠
黄孝红
盛钲钦
HE Wei-hong;ZHANG Yin-di;LI Ying-nan;HUANG Xiao-hong;SHENG Zheng-qin(College of Petroleum Engineering,Yangtze University,Wuhan 430100,China;State Key Laboratory of Low-carbon Catalysis and Carbon Dioxide Utilization,Lanzhou 730000,China;CNOOC Jiangsu Natural Gas Co.,Ltd.,Yancheng 224000,China)
出处
《科学技术与工程》
北大核心
2025年第7期2760-2766,共7页
Science Technology and Engineering
基金
国家自然科学基金(52274060,51974033)
长江人才计划领军人才项目(Yz2021239)。
作者简介
第一作者:何卫宏(1999-),男,汉族,山东潍坊人,硕士研究生。研究方向:LNG冷能利用等。E-mail:2568110073@qq.com;通信作者:张引弟(1978-),女,汉族,甘肃平凉人,博士,教授。研究方向:油气储运热学与集输节能、CO 2捕集与管道输送(CCUS)、燃气技术、管网工艺仿真检测及智能化等。E-mail:zhangyindihust@foxmail.com。
