摘要
基于冷能梯级利用原则,利用Aspen HYSYS模拟分析了现有LNG冷能用于橡胶粉碎的流程,并进行热力学分析,找出了系统中的火用损失最大的设备。根据火用分析结果,得到改进流程,分析两流程之间的差异。结果表明:低温换热器火用损失占比最大,在两流程中分别占比49%、30%,改进流程火用效率从73.64%提升至77.94%,LNG流量每小时减少30.77%,约节能670kW;冷能利用系统火用效率随LNG进口温度降低而升高,梯级利用才能发挥出LNG所含冷能的最大价值。
Based on the principle of cold energy cascade utilization, Aspen HYSYS was employed to simulate and analyze the existing process of LNG cold energy use in rubber crushing, and a thermodynamic analysis was conducted to find out the equipment with the maximum exergy loss in the system. According to the results of the exergy analysis, the conventional process was improved and the differences between the two processes were discussed. The results showed that the exergy loss of low-temperature heat exchangers accounts for the largest proportion, 49% and 22% respectively in the two processes, and decreases with the decrease of LNG inlet temperature. For the improved process, the exergy efficiency increases from 73.64% to 77.94%, and the LNG flow decreases by 30.77% per hour, saving energy about 640 kWh. The exergy efficiency decreases as the inlet temperature of LNG increases, so that the cascade utilization can bring out the maximum value of LNG cold energy.
作者
苗沃生
李琦芬
杨涌文
杨天海
王朝龙
MIAO Wo-sheng;LI Qifen;YANG Yong-wen;YANG Tian-hai;WANG Chao-long(Shanghai University of Electric Power,Shanghai 200090,China;Shanghai Minghua Electric Power Technology Co.,Ltd,Shanghai 200090,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200090)
出处
《天然气化工—C1化学与化工》
CAS
CSCD
北大核心
2020年第2期77-80,94,共5页
Natural Gas Chemical Industry
基金
上海市科学技术委员会科研计划项目(18DZ1203304)。
关键词
火用分析
液化天然气
冷能利用
梯级利用
橡胶粉碎
exergy analysis
LNG
cold energy utilization
cascade utilization
rubber crushing
