بررسي واحد توليد گاز طبيعي مايع در مقياس كوچك

Investigation on LNG Plant in Small Scale

در اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﻓﺮاﯾﻨﺪ ﻣﺎﯾﻊﺳﺎزي ﮔﺎز ﻃﺒﯿﻌﯽ ﺗﮏﻣﺮﺣﻠﻪاي ﺑﺎ ﻣﺒﺮد آﻣﯿﺨﺘﻪ ﺑﻬﯿﻨﻪﺳﺎزي و ﺑﻪدﻧﺒﺎل آن ﺗﺤﻠﯿﻞ اﻧﺮژي و اﮔﺰرژي ﺗﺠﻬﯿﺰات روي آن اﻧﺠﺎم ﺷﺪ و اﺛﺮ ﺑﻬﯿﻨﻪﺳﺎزي اﻧﺮژي ﻣﺼﺮﻓﯽ وﯾﮋه ﺑﺮ ﻫﺰﯾﻨﮥ ﺧﺮﯾﺪ ﺗﺠﻬﯿﺰات ﭼﺮﺧﮥ ﺳﺮدﺳﺎزي ﺑﺮرﺳﯽ ﺷﺪ. اﺳﺎس اﯾﻦ ﻣﻄﺎﻟﻌﻪ ﺑﺮ ﭘﺎﯾﮥ ﻓﺮاﯾﻨﺪ ﭘﺮﯾﮑﻮ ﻗﺮار دارد و ﺑﺎ ﺗﻮﺟﻪ ﺑﻪ ﻣﺤﺪودﯾﺖﻫﺎﯾﯽ ﮐﻪ در اﯾﺮان ﺑﺎ آن ﻣﻮاﺟﻪ ﻫﺴﺘﯿﻢ، ﺑﻪ ﺗﻮﺳﻌﮥ ﻓﺮاﯾﻨﺪ ﺟﺪﯾﺪي ﭘﺮداﺧﺘﻪ ﺷﺪه اﺳﺖ ﮐﻪ در آن ﻣﺸﮑﻼت ﻓﺮاﯾﻨﺪي رﻓﻊ ﺷﺪه ﺑﺎﺷﺪ و ﺳﭙﺲ ﻓﺮاﯾﻨﺪ اراﺋﻪﺷﺪه ﺗﻮﺳﻂ اﻟﮕﻮرﯾﺘﻢ ژﻧﺘﯿﮏ ﺑﻬﯿﻨﻪﺳﺎزي ﺷﺪ. دﺑﯽ ﻣﻮﻟﯽ ﻣﺒﺮد، ﻓﺸﺎرﻫﺎي ﭘﺎﯾﯿﻦ و ﺑﺎﻻي ﻣﺒﺮد در ﭼﺮﺧﻪ، ﻣﻬﻢﺗﺮﯾﻦ ﭘﺎراﻣﺘﺮﻫﺎي ﻋﻤﻠﯿﺎﺗﯽ ﺗﺄﺛﯿﺮﮔﺬار ﻫﺴﺘﻨﺪ ﮐﻪ ﺑﺎ ﺗﺤﻠﯿﻞ ﺣﺴﺎﺳﯿﺖ اﻧﺘﺨﺎب ﺷﺪﻧﺪ. ﻣﺠﻤﻮع اﻧﺮژي ﻣﺼﺮﻓﯽ ﮐﻤﭙﺮﺳﻮرﻫﺎ ﺑﻪ 8/1413 ﮐﯿﻠﻮوات رﺳﯿﺪ و 11درﺻﺪ ﮐﺎﻫﺶ ﯾﺎﻓﺖ. ﻧﺘﺎﯾﺞ ﻧﺸﺎن داد ﺑﻬﯿﻨﻪﺳﺎزي اﻧﺮژي ﻣﺼﺮﻓﯽ وﯾﮋه، ﺑﺎﻋﺚ اﻓﺰاﯾﺶ ﻫﺰﯾﻨﮥ ﻣﺒﺪل ﺣﺮارﺗﯽ ﻣﯽﺷﻮد؛ زﯾﺮا ﺣﺪاﻗﻞ دﻣﺎي ﻧﺰدﯾﮑﯽ در ﻣﺒﺪل، ﮐﺎﻫﺶ و ﺳﻄﺢ ﺗﺒﺎدل ﺣﺮارﺗﯽ ﻻزم ﺑﺎﻻ ﻣﯽرود؛ وﻟﯽ ﻫﺰﯾﻨﮥ ﺧﺮﯾﺪ ﮐﻤﭙﺮﺳﻮرﻫﺎ ﺑﻪﻋﻠﺖ ﮐﻢﺷﺪن اﻧﺮژي ﻣﺼﺮﻓﯽ آنﻫﺎ ﮐﺎﻫﺶ ﻣﯽﯾﺎﺑﺪ.

In this study, the process of single stage mixed natural gas liquefaction is reviewed, then process energy optimization and economic analysis are followed. The effect of specific energy consumption optimization on the costs of cooling equipment was investigated. The basis of this study is PRICO process and due to some limitations and concerns for Iran, it is tried to develop a new modified process so that the available process restrictions would expel and finally the recommended process optimized by genetic algorithm. Mole flow of refrigerant, low pressure and high pressure of refrigerant in the cycle, are the most important operational parameters that were selected by sensitivity analysis. The total energy consumption of compressors reached 1413.8 kW and decreased by 11 percent. Results showed optimization of the specific energy consumption increases the cost of the heat exchanger, due to the reduction of heat exchanger temperature driving force and need to higher heat transfer area. However, the operating cost of compressors can be reduced.