Manufar pretreatment ga LNG shuka

Cire ƙazanta masu cutarwa a cikin iskar gas da abubuwan da zasu iya ƙarfafa yayin aiwatar da aikin cryogenic. Kamar hydrogen sulfide, carbon dioxide, ruwa, nauyi hydrocarbon da mercury. Gas ɗin ciyar da nau'ikan tsire-tsire na LNG daban-daban ya bambanta, don haka hanyoyin jiyya da hanyoyin su ma sun bambanta.
Gas na acid gabaɗaya shine H2S, CO2, cos, RSH da sauran ƙazantattun lokaci na iskar gas. Kawar da iskar acid sau da yawa ana kiransa desulfurization da decarbonization, ko desulfurization na al'ada. Lokacin tsarkake iskar gas, H2S da CO2 za a iya cire su a lokaci guda, saboda ana iya cire waɗannan abubuwan biyu tare a cikin hanyar amintaccen barasa da tsarkakewar ƙwayar ƙwayar cuta.
2.3.2 zaɓi na desulfurization hanya
A cikin sashin sarrafa iskar gas, akwai hanyoyin tsarkakewa guda uku, wato hanyar amintaccen barasa, hanyar potash mai zafi (benfied) da hanyar sulfonol amin.
Mercury: kasancewar mercury na iya lalata kayan aikin aluminum sosai. Lokacin da Mercury (ciki har da elemental mercury, ions mercury da Organic mercury mahadi) ya wanzu, aluminum zai amsa da ruwa don samar da fararen fata na lalata, wanda zai lalata kaddarorin aluminum. Ƙananan adadin mercury ya isa ya haifar da mummunar lalacewa ga kayan aikin aluminum, kuma Mercury zai haifar da gurɓataccen muhalli da cutar da ma'aikata yayin kulawa. Don haka, abun cikin mercury yakamata a iyakance shi sosai. Kauwar Mercury ya dogara ne akan amsawar mercury da sulfur a cikin reactor mai ƙara kuzari.
Hydrocarbon mai nauyi: yana nufin hydrocarbons sama da C5 +. A cikin hydrocarbons, lokacin da nauyin kwayoyin halitta ya canza daga ƙarami zuwa babba, wurin tafasarsa yana canzawa daga ƙasa zuwa babba. Saboda haka, a cikin sake zagayowar na condensing na halitta gas, nauyi hydrocarbons ne ko da yaushe condensed farko. Idan ba'a fara raba ma'aunin hydrocarbon mai nauyi ba, ko kuma ya rabu bayan dasawa, mai nauyi na iya daskare ya toshe kayan aiki. Ana cire wani bangare na hydrocarbons mai nauyi ta hanyar sieve na kwayoyin halitta da sauran adsorbents yayin bushewar ruwa, sauran kuma an raba su ta hanyar rabuwar cryogenic.
Cos: ana iya shayar da shi da ɗan ƙaramin ruwa don samar da H2S da CO2, yana haifar da lalata ga kayan aiki. Sauƙi don haɗuwa tare da propane da aka dawo dasu. Yawancin lokaci ana cire shi tare da H2S da CO2 yayin yankewa.
Helium: iskar gas shine babban tushen helium kuma yakamata a ware kuma a yi amfani da shi. Yana da ƙimar amfani mai yawa ta hanyar haɗuwa da rabuwar membrane da rabuwar cryogenic.
Nitrogen: karuwar abubuwan da ke cikin sa zai sa gurbataccen iskar gas ya fi wahala. Ana amfani da hanyar walƙiya ta ƙarshe don zaɓin cirewa daga LNG.
Babban bangaren iskar gas shine methane (CH4), kuma madaidaicin wurin tafasa shi shine 111k (- 162 ℃).
Matsakaicin adadin methane na ruwa a daidaitaccen wurin tafasa shine 426kg / m3, kuma yawan methane na methane a daidaitaccen jihar shine 0.717kg/m3, tare da bambanci kusan sau 600. Bambanci mai girma a cikin girma shine babban dalili na ajiyar iskar gas mai ruwa da sufuri.


Lokacin aikawa: Dec-03-2021