Zaɓin tsarin tsarkake iskar gas na halitta

Dole ne a tsaftace iskar gas ta halitta a matsayin iskar abinci kafin a yi amfani da ita wajen tace iskar. Wato, a cire iskar acid, ruwa da datti a cikin iskar abinci, kamar H.₂S, CO₂, H₂O, Hg da kuma hydrocarbons masu ƙamshi, don hana su daskarewa a yanayin zafi mai ƙarancin zafi da toshewa da lalata kayan aiki da bututun mai. Tebur 3.1-1 ya lissafa ƙa'idodin iskar gas da ake amfani da ita kafin a yi amfani da ita a masana'antar LNG da kuma mafi girman abubuwan da ke cikin ƙazanta.

Matsakaicin ƙazanta da aka yarda da shi a teburin iskar gas ta LNG

Daga bayanan iskar gas, abun da ke cikin iskar carbon dioxide a cikin iskar gas ya wuce misali kuma dole ne a tsarkake shi.

Tsarin ruwa na MDEA amine shine mafi dacewa dangane da amfani da makamashi, girman magani da saka hannun jari da farashin aiki. Saboda haka, an zaɓi tsarin ruwa na MDEA amine don rage acidity a cikin wannan tsarin.

B) Zaɓin tsarin bushewar ruwa

Kasancewar ruwa a cikin iskar gas sau da yawa yakan haifar da mummunan sakamako: a wasu yanayi, ruwa da iskar gas na halitta suna samar da ruwa don toshe bututun mai da kuma shafar tsarin sanyaya ruwa; Bugu da ƙari, wanzuwar ruwa kuma zai haifar da amfani da wutar lantarki mara amfani; Saboda ƙarancin zafin iskar gas da wanzuwar ruwa, kayan aikin za su daskare kuma su toshe, don haka dole ne a bushe shi.

Tsarin bushewar iskar gas gabaɗaya ya ƙunshi rukuni uku: bushewar ƙasa da zafin jiki, shaƙar datti mai ƙarfi da kuma shaƙar datti mai ƙarfi. Ana amfani da rabuwar daskarewa galibi don guje wa bushewa lokacin da zafin iskar gas ya yi ƙasa. Duk da haka, ƙarancin zafin da yake bayarwa yana da iyaka kuma ba zai iya biyan buƙatun shaƙar iskar gas ba; Shaƙar datti yawanci ya haɗa da sinadarin acid mai ƙarfi (yawanci acid na halitta kamar phosphoric acid mai ƙarfi), glycol (TEG da aka fi amfani da shi), da sauransu, amma waɗannan hanyoyin suna da ƙarancin zurfin bushewa kuma ba za a iya amfani da su a cikin raka'o'in cryogenic ba; Hanyoyin bushewar datti na gama gari na shaƙar datti mai ƙarfi sune hanyar gel silica, hanyar sieve ta kwayoyin halitta ko haɗin hanyoyin biyu.

Dole ne a yi amfani da hanyar shaƙa mai ƙarfi don shaƙar iskar gas ta halitta. Saboda sieve na kwayoyin halitta yana da fa'idodin zaɓin shaƙa mai ƙarfi, halayen shaƙa mai yawa a ƙarƙashin matsin lamba na ƙaramin tururi na ruwa da kuma ƙarin cire iskar acid da ta rage, ana amfani da sieve na kwayoyin halitta na 4A azaman mai shaƙawar bushewa a cikin wannan tsarin.

C) Zaɓin tsarin cire mercury

A halin yanzu, akwai manyan hanyoyin cire sinadarin mercury guda biyu: hanyar shaƙar sinadarin HgSIV na kamfanin UOP a Amurka da kuma sinadarin activated carbon da aka sanya wa sinadarin sulfur don sa mercury ya yi aiki da sulfur don samar da sinadarin mercury sulfide sannan ya sha shi a kan sinadarin activated carbon. Na farko yana da tsada sosai kuma ya dace da lokutan da ke da yawan sinadarin mercury; na biyun yana da ƙarancin kuɗin aiki kuma ya dace da lokutan da ke da ƙarancin sinadarin mercury.

A gefe guda, farashin aiki na sieve na ƙwayoyin HgSIV yana da yawa sosai; A gefe guda kuma, yawan sinadarin mercury a cikin iskar gas na na'urar yana da ƙarancin yawa. Saboda haka, kamfanin yana da ƙwarewa mai nasara wajen amfani da carbon da aka kunna da sulfur don cire mercury.