Kusankha njira yoyeretsera gasi wachilengedwe

Mpweya wachilengedwe monga mpweya wodyetsa uyenera kuyeretsedwa bwino musanamwe madzi. Izi zikutanthauza kuchotsa mpweya wa asidi, madzi ndi zinyalala mu mpweya wodyetsa, monga H₂S, CO₂, H₂O, Hg ndi ma hydrocarbon onunkhira, kuti asazizire pa kutentha kochepa komanso kutsekereza ndi kuwononga zida ndi mapaipi. Gome 3.1-1 likuwonetsa miyezo yokonzekera mpweya wodyetsa mufakitale ya LNG komanso kuchuluka kwa zinyalala.

Tebulo lokhala ndi mpweya woipa kwambiri wa LNG

Kuchokera ku deta ya mpweya wodyetsa, kuchuluka kwa kaboni dayokisaidi mu mpweya wodyetsa kumaposa muyezo ndipo kuyenera kuyeretsedwa.

Njira yamadzimadzi ya MDEA amine ndiyo njira yoyenera kwambiri pankhani ya kugwiritsa ntchito mphamvu, kuchuluka kwa chithandizo, ndalama zomwe zimagwiritsidwa ntchito komanso ndalama zogwirira ntchito. Chifukwa chake, njira yamadzimadzi ya MDEA amine imasankhidwa kuti ichotse asidi mu ndondomekoyi.

B) Kusankha njira yochepetsera madzi m'thupi

Kupezeka kwa madzi mu mpweya wachilengedwe nthawi zambiri kumabweretsa zotsatirapo zoopsa: m'mikhalidwe ina, madzi ndi mpweya wachilengedwe zimapanga madzi oundana kuti atseke payipi ndikukhudza njira yozizira yothira madzi; Kuphatikiza apo, kupezeka kwa madzi kungayambitsenso kugwiritsa ntchito mphamvu zosafunikira; Chifukwa cha kutentha kochepa kwa madzi achilengedwe komanso kupezeka kwa madzi, zidazo zidzazizidwa ndi kutsekedwa, kotero ziyenera kuuma.

Njira yochotsera madzi m'thupi pogwiritsa ntchito mpweya wachilengedwe nthawi zambiri imakhala ndi magulu atatu: kutaya madzi m'thupi pogwiritsa ntchito kutentha kochepa, kulowetsedwa kwa desiccant yolimba komanso kuyamwa kwa solvent. Kulekanitsa kuzizira kumagwiritsidwa ntchito makamaka popewa hydrate pamene kutentha kwa mpweya wachilengedwe kuli kotsika. Komabe, kutentha kochepa komwe kumalola kumakhala kochepa ndipo sikungakwaniritse zofunikira za liquefaction ya mpweya wachilengedwe; Kuyamwa kwa solvent nthawi zambiri kumaphatikizapo asidi wokhuthala (nthawi zambiri organic acid monga phosphoric acid wokhuthala), glycol (yomwe imagwiritsidwa ntchito kwambiri ndi TEG), ndi zina zotero, koma njira izi zimakhala ndi kuya kochepa kwa madzi m'thupi ndipo sizingagwiritsidwe ntchito m'mayunitsi a cryogenic; Njira zodziwika bwino za desiccant yolimba ndi njira ya silica gel, njira ya molecular sieve kapena kuphatikiza njira ziwirizi.

Njira yothira madzi yolimba iyenera kugwiritsidwa ntchito pothira madzi m'thupi pogwiritsa ntchito mpweya wachilengedwe. Popeza sieve ya molecular ili ndi ubwino wosankha madzi m'thupi mwamphamvu, imathira madzi ambiri pansi pa mphamvu yochepa ya nthunzi ya madzi komanso kuchotsa mpweya wotsalira wa asidi, sieve ya 4A molecular imagwiritsidwa ntchito ngati sieve yothira madzi m'thupi pogwiritsa ntchito njira imeneyi.

C) Kusankha njira yochotsera mercury

Pakadali pano, pali njira ziwiri zazikulu zochotsera mercury: njira ya HgSIV molecular sieve adsorption ya kampani ya UOP ku United States ndi sulfure yomwe imalowetsedwa mu activated carbon kuti mercury igwirizane ndi sulfure kuti ipange mercury sulfide ndikuyiyika pa activated carbon. Yoyambayo ili ndi mtengo wokwera ndipo ndi yoyenera pazochitika zomwe zili ndi mercury yambiri; Yomalizayi ili ndi mtengo wotsika wogwirira ntchito ndipo ndi yoyenera pazochitika zomwe zili ndi mercury yochepa.

Kumbali imodzi, mtengo wogwiritsira ntchito sieve ya molekyulu ya HgSIV ndi wokwera kwambiri; Kumbali ina, kuchuluka kwa mercury mu mpweya wodyetsa wa chipangizocho ndi kochepa. Chifukwa chake, kampaniyo ili ndi luso lopambana pakugwiritsa ntchito sulfure yomwe imayikidwa mu activated carbon pochotsa mercury.