Igesi yendalo ekhutshiweyo ine-asidi ethile ye-CO2, enokubangela iingxaki ezifana nokwehla kwexabiso leekhalori kunye nokugqwala kwepayipi. Ke ngoko, unyango lwe-decarbonization luyafuneka ngaphambi kokuthuthwa nokusetyenziswa kwepayipi.
Ngokwefomula yexabiso leekhalori zegesi yendalo kumgangatho wesizwe (GB/T 11062-2014), kunokubalwa ukuba i-10mol% CO2 iya kubangela ukwehla kwexabiso leekhalori zemethane elimalunga ne-9.80% nge-cubic meter nganye. Xa i-CO2 ihambelana nomphunga wamanzi kwaye inoxinzelelo oluncinci olungaphezulu kwe-207kPa, iya kubangela ukubola okukhulu kwizixhobo kunye nemibhobho, kwaye kufuneka kuthathwe amanyathelo ongezelelweyo okulwa nokubola. Ke ngoko, igesi yendalo kufuneka isuswe ngokungqongqo i-CO2 ngaphambi kokuba ithuthwe iye kwimibhobho yorhwebo.
Inkqubo ye-MDEA iyasetyenziswa ukususa i-CO2 kwigesi yendalo.
Iipropati ze-MDEA ze-physicochemical kunye nomgaqo we-decarburization
I-MDEA, igama lesayensi elithi N-methyldiethanolamine, lulwelo oluqinileyo olungenambala okanye olumthubi kancinci.
Ifomula yemolekyuli: CH3N(CH2CH2OH)2,
Iqondo lokubila: 246~249 ℃ /760mmhg; ubunzima obuthile: 1.0425g/ml (20 ℃);
Iqondo lokuqandisa: -21 ℃ (ubumsulwa 99%); i-viscosity: 101Cp (20 ℃);
Ingaxutywa lula ngamanzi, i-ethanol, i-ether, njl.njl.; i-alkaline encinci emanzini; i-chemical reaction iya kwenzeka kwi-acid carbon dioxide kunye ne-hydrogen sulfide gas, kwaye xa uxinzelelo luphezulu, i-carbon dioxide kunye ne-hydrogen sulfide gas ziphezulu. Ngoko ke yonke inkqubo yokufunxa yinkqubo yokufunxa ngokwasemzimbeni nangokweekhemikhali.
Ulwelo olutyebileyo lwe-MDEA emva kokufunxa i-hydrogen sulfide kunye ne-carbon dioxide lungena kwi-flash tank ukuze lukhuphe i-vacuum flash evaporation, emva koko luthunyelwa kwi-regeneration tower. Ulwelo olutyebileyo luyafudunyezwa luze lubole ezantsi kwe-tower ukuze lukhuphe ngokupheleleyo i-carbon dioxide kunye ne-hydrogen sulfide. Kwangaxeshanye, igesi esezantsi kwe-tower iyaphakama ukuze yenze isiphumo sesibini sokukrazula kulwelo olutyebileyo oluphezulu kwe-tower.; ngoko ke yonke inkqubo yokuvuselela ikwayinkqubo yokuvuselela ngokomzimba nangokweekhemikhali. Impendulo ethile yeekhemikhali yile ilandelayo:
R2R'N + H2S R2R'NH +HS (impendulo ekhawulezileyo)
R2R'N+CO2+ H2O R2R'NH +HCO3 (impendulo ecothayo)
I-Hengzhong igxile kunyango lwemithombo yamanzi endle, ukucocwa kwegesi yendalo, ukubuyiswa kwe-LPG, Isityalo se-LNG kwaye iseti yejenereyitha yegesi yendalo.
Qhagamshelana:
Izixhobo zokuZenzekelayo zaseSichuan Hengzhong Co., Ltd.
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Ixesha lokuthumela: Disemba-03-2023