Igesi yendalo njengegesi yokutya kufuneka icocwe kakuhle ngaphambi kokuba inyibilike. Oko kukuthi, ukususa igesi eneasidi, amanzi kunye nokungcola kwigesi yokutya, njenge-H2S, CO2, H2I-O, i-Hg kunye nee-hydrocarbons ezinuka kamnandi, ukuze zingabanda kubushushu obuphantsi kwaye zivale kwaye zidle izixhobo kunye nemibhobho. Itheyibhile 3.1-1 idwelisa imigangatho yonyango lwangaphambi konyango lwegesi yokutya kwisityalo se-LNG kunye nomxholo ophezulu wokungcola.
Itheyibhile yobungakanani bokungcola obuvumelekileyo begesi ye-LNG feed
| Ukungcola | Umda womxholo | Isiseko |
| H2I- | ＜1ppmV | A (kuvumelekile ukuba kudlule umda wokunyibilika, ngaphandle kokunciphisa imveliso) |
| i-CO2 | 50～100ppmV | B (Ukunyibilika kokugqibela) |
| H2S | ＜4ppmV | C (iimfuno zobugcisa bemveliso) |
| Umxholo wesalfure uwonke | 10～50mg/NM3 | C |
| I-Hg | ＜0.01μg/NM3 | A |
| I-hydrocarbon enuka kamnandi | ≤10ppmV | A okanye B |
| Iihydrocarbons ezipheleleyo ze-naphthenic | ≤10ppmV | A okanye B |
Ngokwedatha yegesi yokutya, umxholo wekhabhoni dioksayiksayikshini kwigesi yokutya udlula umgangatho kwaye kufuneka ucocwe.
Inkqubo yolwelo lwe-amine ye-MDEA yeyona nkqubo ifanelekileyo ngokwendlela esetyenziswa ngayo amandla, ubungakanani bonyango kunye notyalo-mali kunye neendleko zokusebenza. Ke ngoko, inkqubo yolwelo lwe-amine ye-MDEA ikhethwa kwigesi yokunciphisa i-asidi kwesi sikimu.
B) Ukukhethwa kwenkqubo yokuphelelwa ngamanzi emzimbeni
Ukubakho kwamanzi kwigesi yendalo kudla ngokukhokelela kwimiphumo emibi: phantsi kweemeko ezithile, amanzi kunye negesi yendalo zenza i-hydrate ukuvala umbhobho kwaye zichaphazele inkqubo yokunyibilika komoya opholileyo; Ukongeza, ukubakho kwamanzi kuya kubangela nokusetyenziswa kwamandla okungeyomfuneko; Ngenxa yobushushu obuphantsi bokunyibilika kwegesi yendalo kunye nokubakho kwamanzi, izixhobo ziya kubanda kwaye zivalwe, ngoko ke kufuneka zisuswe emanzini.
Inkqubo yokuphelelwa ngamanzi kwigesi yendalo ngokubanzi ibandakanya iindidi ezintathu: ukuphelelwa ngamanzi kwiqondo lobushushu obuphantsi, ukufunxwa kwe-desiccant eqinileyo kunye nokufunxwa kwe-solvent. Ukwahlulwa kwe-freezing kusetyenziswa kakhulu ukuthintela i-hydrate xa ubushushu begesi yendalo buphantsi. Nangona kunjalo, ubushushu obuphantsi obuvumelayo bulinganiselwe kwaye abukwazi ukuhlangabezana neemfuno ze-liquefaction yegesi yendalo; Ukufunxwa kwe-solvent kudla ngokubandakanya i-acid exineneyo (ngesiqhelo i-organic acid efana ne-phosphoric acid exineneyo), i-glycol (esetyenziswa rhoqo yi-TEG), njl.njl., kodwa ezi ndlela zinobunzulu obuphantsi bokuphelelwa ngamanzi kwaye azinakusetyenziswa kwiiyunithi ze-cryogenic; Iindlela eziqhelekileyo zokuphelelwa ngamanzi kwi-desiccant eqinileyo yindlela ye-silica gel, indlela ye-molecular sieve okanye indibaniselwano yeendlela ezimbini.
Indlela yokufunxa eqinileyo kufuneka isetyenziswe ekupheliseni ulwelo lwegesi yendalo. Ngenxa yokuba isihluzo semolekyuli sineengenelo zokukhetha ukufunxa ngamandla, iimpawu zokufunxa eziphezulu phantsi koxinzelelo oluphantsi lomphunga wamanzi kunye nokususwa ngakumbi kwegesi eseleyo ye-asidi, isihluzo semolekyuli se-4A sisetyenziswa njengesihluzo sokuphelisa ulwelo kolu hlobo.
C) Ukukhethwa kwenkqubo yokususa i-mercury
Okwangoku, kukho iinkqubo ezimbini eziphambili zokususa i-mercury: indlela yokufunxa i-HgSIV molecular sieve yenkampani ye-UOP e-United States kunye ne-sulfur efakwe i-activated carbon ukuze i-mercury isabela ne-sulfur ukuze ivelise i-mercury sulfide kwaye iyifunxe kwi-activated carbon. Eyokuqala inexabiso eliphezulu kwaye ifanelekile kwiimeko ezinomxholo ophezulu we-mercury; Eyokugqibela inexabiso eliphantsi lokusebenza kwaye ifanelekile kwiimeko ezinomxholo ophantsi we-mercury.
Kwelinye icala, iindleko zokusebenza kwesihluzo semolekyuli ye-HgSIV ziphezulu kakhulu; Kwelinye icala, umxholo we-mercury kwigesi yokutya yeyunithi uphantsi kakhulu. Ke ngoko, inkampani inamava aphumeleleyo ekusebenziseni ikhabhoni esebenzayo efakwe kwi-sulfur ekususeni i-mercury.
Ixesha lokuposa: Jan-14-2022