Liquefied Natural Gas (LNG) ndi gasi wachilengedwe, makamaka methane, womwe udakhazikika kuti ukhale wamadzimadzi kuti ukhale wosavuta komanso wotetezeka pakusungirako ndi kuyendetsa. Zimatenga pafupifupi 1/600th kuchuluka kwa gasi wachilengedwe mugawo la mpweya.
Timapereka Zomera Zothirira Gasi Wachilengedwe muzocheperako (zochepa) komanso zazing'ono. Kuchuluka kwa zomera kumakwirira kuchokera ku 13 mpaka matani oposa 200 / tsiku la kupanga LNG (20,000 mpaka 300,000 Nm).3/d).
Gasi wamafuta:
- ● Malo amene ali ndi gasi
- ● Gasi wogwirizana/woyaka
- ● Gasi wamagetsi
- ● Gasi wapaipi
Chomera chathunthu cha LNG liquefaction chimaphatikizapo machitidwe atatu: njira yoyendetsera, makina owongolera zida ndi makina ogwiritsira ntchito. Malingana ndi magwero osiyanasiyana a mpweya, zikhoza kusinthidwa.
Malinga ndi mkhalidwe weniweni wa gasi gwero, ifetsatirani njira yabwino kwambiri komanso chiwembu chachuma kwambiri kuti mukwaniritse zofunikira zosiyanasiyana za makasitomala.Zida zoyika pa skid zimapangitsa mayendedwe ndi kukhazikitsa kukhala kosavuta.
1. Ndondomeko ya ndondomeko
Mpweya wachilengedwe umakanikizidwa pambuyo pa kusefera, kupatukana, kuwongolera kuthamanga ndi metering, kenako ndikulowa munjira yopangira gasi. Pambuyo pochotsa CO2, H2S, Hg, H2 O ndi heavy hydrocarbons, amalowa mu liquefaction ozizira bokosi. Ndiye Iwo utakhazikika mu mbale zipsepse kutentha exchanger, denitrified pambuyo liquefaction, ndi lotsatira subcooled, throttled ndi kung'anima kwa kung'anima thanki, ndipo otsiriza, olekanitsidwa madzi gawo akulowa LNG yosungirako thanki monga LNG mankhwala.
Mayendedwe a skid okwera LNG Plant ali motere:
Dongosolo la cryogenic LNG Plant limaphatikizapo:
- ● Kudyetsa gasi kusefera, kupatukana, kuwongolera kukakamiza ndi gawo la metering;
- ● Feed gasi pressurization unit
- ● Chigawo cha pretreatment (kuphatikizapo deacidification, kutaya madzi m'thupi ndi kuchotsa heavy hydrocarbon, mercury ndi kuchotsa fumbi);
- ● MR proportioning unit ndi MR compression cycle unit;
- ● LNG liquefaction unit (kuphatikizapo denitrification unit);
1.1 Mawonekedwe a process system
1.1.1 Gawo lamafuta opangira mafuta
Njira yopangira gasi pretreatment unit ili ndi izi:
- ● Kuchotsa asidi ndi mankhwala a MDEA kuli ndi ubwino wa kuchita thovu laling'ono, kuchepa kwa dzimbiri ndi kutaya pang'ono kwa amine.
- ● Sieve adsorption ya molekyulu imagwiritsidwa ntchito pochepetsa kuchepa kwa madzi m'thupi, ndipo imakhalabe ndi mwayi wokometsera kwambiri ngakhale pansi pa mpweya wochepa wa madzi.
- ● Kugwiritsa ntchito kaboni wa sulfure wopangidwa ndi sulfure kuchotsa mercury ndikotsika mtengo. Mercury imakhudzidwa ndi sulfure pa sulfure wolowetsedwa wa carbon activated kuti ipange mercury sulfide, yomwe imayikidwa pa activated carbon kuti ikwaniritse cholinga chochotsa Mercury.
- ● Zinthu zosefera zolondola zimatha kusefa sieve ya molekyulu ndi fumbi loyatsidwa ndi kaboni pansi pa 5μm.
1.1.2 Chigawo cha Liquefaction ndi refrigeration
Njira yosankhidwa ya liquefaction ndi refrigeration unit ndi MRC (mixed refrigerant) refrigeration cycle refrigeration, yomwe imakhala yochepa mphamvu. Njirayi imakhala ndi mphamvu zochepa kwambiri pakati pa njira zomwe zimagwiritsidwa ntchito nthawi zambiri mufiriji, zomwe zimapangitsa kuti mtengo wa malonda ukhale wopikisana pamsika. Gawo la refrigerant proportioning unit limakhala lodziyimira pawokha pagawo lozungulira. Panthawi yogwira ntchito, gawo lofananira limabwezeretsanso refrigerant ku gawo loponderezana lozungulira, kusunga magwiridwe antchito okhazikika agawo lozungulira; Chigawocho chikatsekedwa, gawo lolinganiza likhoza kusunga firiji kuchokera ku gawo loponderezedwa lapamwamba la unit compression unit popanda kutulutsa firiji. Izi sizingangopulumutsa refrigerant, komanso kufupikitsa nthawi yotsatira yoyambira.
Mavavu onse mu bokosi lozizira amawotchedwa, ndipo palibe kugwirizana kwa flange mu bokosi lozizira kuti muchepetse kutayikira komwe kungatheke mubokosi lozizira.
1.2 Zida zazikulu za Unit iliyonse
| S/N | Dzina la unit | Zida zazikulu | |
| 1 | Kudyetsa gasi kusefera kulekana ndi kuwongolera unit | Dyetsani zosefera zamafuta, flowmeter, chowongolera kupanikizika, compressor yamafuta amafuta | |
| 2 | Chigawo chothandizira | Deacidization unit | Absorber ndi regenerator |
| Gawo la kuchepa madzi m'thupi | Adsorption tower, chotenthetsera chotenthetsera, choziziritsa kukonzanso mpweya komanso cholekanitsa gasi | ||
| Heavy hydrocarbon kuchotsa unit | Adsorption Tower | ||
| Mercury kuchotsa ndi kusefera unit | Mercury remover ndi fumbi fyuluta | ||
| 3 | Liquefaction unit | Cold box, mbale kutentha exchanger, olekanitsa, denitrification nsanja | |
| 4 | Mixed refrigerant refrigeration unit | Refrigerant yozungulira kompresa ndi refrigerant proportioning tank | |
| 5 | Mtengo wapatali wa magawo LNG | Kutsegula dongosolo | |
| 6 | Bog recovery unit | Bog regenerator | |
2. Dongosolo lowongolera zida
Pofuna kuwunika bwino ntchito yopanga zida zonse, ndikuwonetsetsa kuti magwiridwe antchito odalirika komanso osavuta kugwiritsa ntchito ndi kukonza, zida zowongolera zida zimaphatikizapo:
Distributed control system (DCS)
Chitetezo Chida chachitetezo (SIS)
Alamu yamoto ndi makina ojambulira gasi (FGS)
TV yotsekedwa (CCTV)
Analysis system
Ndipo zida zolondola kwambiri (flowmeter, analyzer, thermometer, gage pressure) zomwe zimakwaniritsa zofunikira. Dongosololi limapereka kasinthidwe koyenera, kuyitanitsa ndi kuyang'anira ntchito, kuphatikiza kupeza njira, kuwongolera kotseka, kuyang'anira zida zogwirira ntchito, kutsekereza ma alarm ndi ntchito, kukonza ndikuwonetsa zenizeni zenizeni, ntchito zamachitidwe, kuwonetsa zithunzi, ntchito ya lipoti lantchito ndi ntchito zina. Pakakhala zadzidzidzi mu gawo lopangira kapena FGS imatumiza chizindikiro cha alamu, SIS imatumiza chizindikiro chotchinga chitetezo kuti chiteteze zida zapamalo, ndipo FGS imadziwitsa dipatimenti yozimitsa moto nthawi yomweyo.
3. Dongosolo lothandizira
Dongosololi limaphatikizapo: chida cha mpweya, gawo la nayitrogeni, gawo lamafuta otengera kutentha, gawo lamadzi la desalted ndi kuziziritsa kozungulira madzi.
