天然气压差利用工艺对比和分析

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DOI：10.3969/j.issn.1001-2206.2025.03.010

Comparison and analysis of natural gas pressure difference utilization technology

GOU Renhui

ScienceandThologforatinteo.OoductioantofabeiOieldoayetrinCod.i6

China

Abstract：Atpresent，mostofthenaturalgaspressurediferenceutilizationprojectshaveadoptedasinglestageexpansionprocess， whichmayhaveproblemsschaslowoperatingiencysmallwergeneratio，andigequirementsforquipmentsistaeto lowtemperatures.Tosolvetheaboveproblems，tepresue-volumediagamwasusedtodescribethetheralchangeprocssofnatural gasinthesingle-stage expansionprocessandthemulti-stageexpansionprocessThesinglestage expansionproessandhemultistageexpansionprocessmodelswereestablishedbyHYSYSsoftware，andthediferencesbetweentheexpansion processswere comparedfromthespectsofoutputshaftpower，heatingpower，andcoldenergyutilization.Theresultsshowthattheoutputshaftpower oftheexpanderinesinglestageexpasioproessislargertantatintheprocsofatingbeforeexpandig，uttecoditionof coldenergyrcoveryisnotavailable.Whentheintermediatepressrevalueofthemultistageexpansionprocesisonsistentwithth constantexpansonconditioteproesspeforanceiseter，ndeoutputsaftpowerofteexpanderislos，hichisoducive totheselectionoftegeneratorsetwiththsaeistaledcapacityandconvenientforthesubsequentmaintenanceandmaintenanceof the equipment. Under the conditions of upstream natural gas supply pressre of 4 MPa， temperature of 20∘C ，flow rate of 15000m3/h downstream natural gas demand pressure of 1.5 MPa，and temperature of 5∘C ，the two-stage expansion process is relatively better in terms of power generation，heating power，and heat source selection.The daily power generation is 7124kW⋅h ，heating power is 284 （204号 kW ，andtheeatsourcecanchosecirculating water.Onlyoneexpanerisaddedcomparedwiththesingle-stage expansionprocess.he research results can provide a theoretical basis for the utilization of pressure difference energy of natural gas.

天然气作为一次能源，其污染量和碳排放量远低于石油、煤碳等传统一次能源，因此天然气仍是实现我国“碳中和”“碳达峰”目标下油气田企业实现降本增效的重要抓手。（剩余5431字）