双循环混合制冷剂天然气液化流程的优化模拟
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摘要
为了降低天然气液化工厂中液化单元双循环混合制冷剂天然气液化流程(DMR)的功耗,文中采用化工过程模拟软件HYSYS建立了优化计算模型,该模型以系统最小功耗为目标函数,以混合制冷剂压力和配比为决策变量,选取了一种典型的天然气组分对DMR液化流程进行了优化模拟,得到了流程中各点的状态参数、最优操作参数和最优混合制冷剂配比。在优化过程中发现,优化的实质是:在满足各换热器最小温差情况下,通过对混合冷剂配比和流程参数的优化使各换热器内的平均换热温差尽可能减小。此外,在保证99.6%的高天然气液化率的情况下,文中得到流程的单位质量天然气的液化功耗为271 kW/t,液化■效率为45.4%,与国内现行的DMR流程功耗相比,能耗显著降低。
In order to reduce the power consumption of the natural gas liquefaction process with double mixed refrigerant cycle(DMR) in liquefaction units of natural gas liquefaction plants, the model of optimization calculation was established by using HYSYS and simulation software of chemical process. In the model, the minimum system power consumption is regarded as the objective function, the mixed refrigerant pressure and the ratio are regarded as decision variables. The DMR liquefaction process is optimized simulation, and state parameters at various points in the process, the optimal operating parameters and the optimal ratios of mixed refrigerants are obtained through choosing a typical component of natural gas. The essence of optimization simulation is that when the minimum temperature difference of each heat exchanger is satisfied, the average heat transfer temperature difference of each heat exchanger is minimized by optimizing the ratio of mixed refrigerant and flow parameters. Gas liquefaction power consumption of unit mass in the process is 271 kW/t, the liquefied energy efficiency is 45.4% at the condition of natural gas liquefaction rate is up to 99.6%. Compared with domestic power consumption in DMR process, energy consumption decreased significantly.
In order to reduce the power consumption of the natural gas liquefaction process with double mixed refrigerant cycle(DMR) in liquefaction units of natural gas liquefaction plants, the model of optimization calculation was established by using HYSYS and simulation software of chemical process. In the model, the minimum system power consumption is regarded as the objective function, the mixed refrigerant pressure and the ratio are regarded as decision variables. The DMR liquefaction process is optimized simulation, and state parameters at various points in the process, the optimal operating parameters and the optimal ratios of mixed refrigerants are obtained through choosing a typical component of natural gas. The essence of optimization simulation is that when the minimum temperature difference of each heat exchanger is satisfied, the average heat transfer temperature difference of each heat exchanger is minimized by optimizing the ratio of mixed refrigerant and flow parameters. Gas liquefaction power consumption of unit mass in the process is 271 kW/t, the liquefied energy efficiency is 45.4% at the condition of natural gas liquefaction rate is up to 99.6%. Compared with domestic power consumption in DMR process, energy consumption decreased significantly.
引文
[1]付道明,孙军,贺志刚,等.天然气预处理和液化工艺技术的研究进展[J].石油与天然气化工,2004,33(4):240-244.
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[4]石玉美,杨敏之,鲁雪生,等.带丙烷预冷的混合制冷剂循环液化天然气流程的优化分析[J].天然气工业,2001,21(2):107-110.
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[6]尹全森,李红艳,崔杰诗,等.单级混合制冷剂液化循环适应性和调节能力研究[J].低温工程,2010,2010(1):1-4.
[7]赵敏,厉彦忠.丙烷预冷混合制冷剂液化流程中原料气与制冷剂匹配研究[J].西安交通大学学报,2010,44(2):108-112.
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[9]王保庆.天然气液化工艺技术比较分析[J].天然气工业,2009,29(1):111-113.
[10]孟毅明,王东军,陈博.天然气液化混合冷剂配方优化研究[J].石油与天然气化工,2015,44(3):65-69.
[11]杨鑫磊,范代娣,员汝娜,等.MRC工艺中混合冷剂设计参数与配比的优化[J].化学工程,2018,46(1):1-6.
[12]曹文胜,鲁雪生,石玉美,等.小型天然气液化流程[J].天然气工业,2005,25(5):109-111.
[13]尹全森,李红艳,季中敏,等.混合制冷剂循环的级数对制冷性能的影响[J].化工学报,2009,60(11):2689-2693.
[14]NOGAL F D,KIM J K,PERRY S,et al.Optimal design of mixed refrigerant cycles[J].Industrial&Engineering Chemistry Research,2008,47:8724-8740.
[15]石玉美,汪荣顺,顾安忠,等.流程参数对丙烷预冷混合制冷剂循损失的影响[J].上海交通大学学报,2004,38(10):1703-1706.
[16]刘佳,白改玲,纪明磊.一种评价天然气液化工艺技术先进性的新方法[J].化学工程,2016,44(11):69-73.
[2]REMELJEJ C W,HOADLEY A F A.An exergy analysis of small-scale liquefied natural gas(LNG)liquefaction processes[J].Energy,2006,31:2005-2019.
[3]MAFI M,AMIDPOUR M,NAEYNIAN S M M.Development in mixed refrigerant cycles used in olefin plants[J].Proceedings of Annual Gas Processing Symposium,2009,1:154-161.
[4]石玉美,杨敏之,鲁雪生,等.带丙烷预冷的混合制冷剂循环液化天然气流程的优化分析[J].天然气工业,2001,21(2):107-110.
[5]王元春,程小姣,高俊,等.阶式双混合冷剂液化天然气流程的混合制冷剂研究[J].石油与天然气化工,2015,44(3):50-53.
[6]尹全森,李红艳,崔杰诗,等.单级混合制冷剂液化循环适应性和调节能力研究[J].低温工程,2010,2010(1):1-4.
[7]赵敏,厉彦忠.丙烷预冷混合制冷剂液化流程中原料气与制冷剂匹配研究[J].西安交通大学学报,2010,44(2):108-112.
[8]KHAN M S,KARIMI I A,LEE M.Evolution and optimization of the dual mixed refrigerant process of natural gas liquefaction[J].Applied Thermal Engineering,2016,96:320-329.
[9]王保庆.天然气液化工艺技术比较分析[J].天然气工业,2009,29(1):111-113.
[10]孟毅明,王东军,陈博.天然气液化混合冷剂配方优化研究[J].石油与天然气化工,2015,44(3):65-69.
[11]杨鑫磊,范代娣,员汝娜,等.MRC工艺中混合冷剂设计参数与配比的优化[J].化学工程,2018,46(1):1-6.
[12]曹文胜,鲁雪生,石玉美,等.小型天然气液化流程[J].天然气工业,2005,25(5):109-111.
[13]尹全森,李红艳,季中敏,等.混合制冷剂循环的级数对制冷性能的影响[J].化工学报,2009,60(11):2689-2693.
[14]NOGAL F D,KIM J K,PERRY S,et al.Optimal design of mixed refrigerant cycles[J].Industrial&Engineering Chemistry Research,2008,47:8724-8740.
[15]石玉美,汪荣顺,顾安忠,等.流程参数对丙烷预冷混合制冷剂循损失的影响[J].上海交通大学学报,2004,38(10):1703-1706.
[16]刘佳,白改玲,纪明磊.一种评价天然气液化工艺技术先进性的新方法[J].化学工程,2016,44(11):69-73.