Iskar iskar gas a matsayin iskar gas dole ne a tsaftace ta sosai kafin ruwa. Wato cire gas ɗin acid, ruwa da ƙazanta a cikin iskar gas, kamar H2S, CO2, H2 O, Hg da hydrocarbons masu kamshi, don hana su daga daskarewa a ƙananan zafin jiki da toshewa da lalata kayan aiki da bututun mai. Tebu 3.1-1 ya jera ka'idojin pretreatment na iskar gas a cikin shuka na LNG da matsakaicin abun ciki na ƙazanta.
Matsakaicin ƙazamin abun ciki mai ƙazanta da aka yarda da shi na iskar gas na LNG
| Rashin tsarki | Iyakar abun ciki | Tushen |
| H2O | 1 ppmV | A (an yarda ya wuce iyakar rushewa, ba tare da iyakance samarwa ba) |
| CO2 | 50 ~ 100ppmV | B (masu narkewa) |
| H2S | 4ppmV | C (bukatun fasaha na samfur) |
| Jimlar abun ciki na sulfur | 10 ~ 50mg/NM3 | C |
| Hg | 0.01μg/NM3 | A |
| Aromatic hydrocarbon | ≤10ppmV | A ko B |
| Jimlar naphthenic hydrocarbons | ≤10ppmV | A ko B |
Daga bayanan iskar gas ɗin abinci, abubuwan da ke cikin carbon dioxide a cikin iskar gas ɗin abinci ya zarce ma'auni kuma dole ne a tsarkake shi.
Tsarin ruwa na MDEA amine shine tsari mafi dacewa dangane da amfani da makamashi, sikelin jiyya da saka hannun jari da farashin aiki. Don haka, an zaɓi tsarin ruwa na MDEA amine don iskar gas a cikin wannan makirci.
B) Zaɓin tsarin rashin ruwa
Kasancewar ruwa a cikin iskar gas yakan haifar da sakamako mai tsanani: a ƙarƙashin wasu yanayi, ruwa da iskar gas suna samar da hydrate don toshe bututun kuma suna shafar tsarin sanyaya ruwa; Bugu da ƙari, kasancewar ruwa kuma zai haifar da amfani da wutar lantarki da ba dole ba; Saboda ƙarancin zafin jiki na iskar gas da kasancewar ruwa, kayan aikin za su daskare kuma a toshe su, don haka dole ne a bushe.
Tsarin dehydration na iskar gas gabaɗaya ya haɗa da nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan nau'ikan) da nau'ikan dehydration na bushewa da na'urar bushewa da bushewar yanayi ya haɗa da nau'ikan ƙarancin zafin jiki da ƙarancin ƙarancin zafin jiki da ƙarancin bushewar bushewa da ɗaukar ƙarfi. Ana amfani da daskarewa musamman don guje wa hydrate lokacin da zafin iskar gas ya yi ƙasa. Duk da haka, ƙananan zafin jiki da yake ba da izini yana da iyaka kuma ba zai iya biyan bukatun buƙatun iskar gas ba; Ƙunƙarar narkewa yawanci ya haɗa da acid mai mai da hankali (yawanci Organic acid irin su phosphoric acid mai da hankali), glycol (wanda aka fi amfani da shi TEG), da dai sauransu, amma waɗannan hanyoyin suna da ƙananan ƙarancin bushewa kuma ba za a iya amfani da su a cikin sassan cryogenic ba; Hanyoyin bushewa na yau da kullun na ƙaƙƙarfan desiccant sune hanyar gel silica, hanyar sieve kwayoyin halitta ko haɗin hanyoyin biyu.
Dole ne a yi amfani da ƙaƙƙarfan hanyar adsorption don ƙarancin ƙarancin iskar gas. Saboda sieve kwayoyin yana da fa'idodi na zaɓi mai ƙarfi na adsorption, manyan halayen adsorption a ƙarƙashin ƙarancin ƙarancin ruwa tururi da ƙarin cire gas ɗin ragowar acid, ana amfani da sieve kwayoyin 4A azaman adsorbent na bushewa a cikin wannan makirci.
C) Zaɓin tsarin cire mercury
A halin yanzu, akwai manyan matakai guda biyu na kawar da mercury: HgSIV tsarin tallan ƙwayar ƙwayar ƙwayar ƙwayar cuta ta kamfanin UOP a Amurka da sulfur mai kunna carbon da aka kunna don yin mercury ya amsa tare da sulfur don samar da sulfide na mercury kuma ya sanya shi akan carbon da aka kunna. Tsohon yana da tsada mai tsada kuma ya dace da lokatai tare da babban abun ciki na mercury; Ƙarshen yana da ƙananan farashin aiki kuma ya dace da lokatai tare da ƙananan abun ciki na mercury.
A gefe guda, farashin aiki na HgSIV ƙwayar ƙwayar ƙwayar cuta yana da yawa; A gefe guda, abun ciki na mercury a cikin iskar gas ɗin naúrar ba ta da ƙarfi. Don haka, kamfanin yana da ƙwarewar nasara wajen amfani da sulfur da aka kunna kunna carbon don cire mercury.
Lokacin aikawa: Janairu-14-2022
