Lub hom phiaj ntawm pretreatment rau LNG nroj tsuag

Tshem tawm cov teeb meem impurities hauv cov pa roj thiab cov khoom uas tuaj yeem ua kom khov thaum lub sij hawm cryogenic.Xws li hydrogen sulfide, carbon dioxide, dej, hnyav hydrocarbon thiab mercury.Cov roj pub noj los ntawm ntau hom LNG cov nroj tsuag sib txawv, yog li cov kev kho mob thiab cov txheej txheem kuj txawv.
Acid gas feem ntau yog H2S, CO2, cos, RSH thiab lwm yam roj theem impurities.Kev tshem tawm cov roj acid feem ntau hu ua desulfurization thiab decarbonization, los yog ib txwm desulfurization.Thaum purifying natural gas, H2S thiab CO2 tuaj yeem raug tshem tawm tib lub sijhawm, vim tias ob lub ntsiab lus no tuaj yeem raug tshem tawm ua ke hauv cawv amine txoj kev thiab molecular sieve adsorption purification.
2.3.2 xaiv txoj kev desulfurization
Nyob rau hauv lub natural gas liquefaction chav tsev, muaj peb txoj kev purification, uas yog cawv amine txoj kev, kub potash txoj kev (benfied) thiab sulfonol amine txoj kev.
Mercury: Lub xub ntiag ntawm mercury tuaj yeem ua rau cov khoom siv txhuas corrode.Thaum Mercury (xws li cov khoom siv mercury, mercury ions thiab cov organic mercury compounds) tshwm sim, txhuas yuav hnov ​​​​mob nrog dej los tsim cov hmoov dawb dawb, uas yuav ua rau cov khoom ntawm txhuas puas.Ib qho me me ntawm cov mercury txaus ua rau muaj kev puas tsuaj loj rau cov khoom siv txhuas, thiab Mercury tseem yuav ua rau muaj kuab paug ib puag ncig thiab ua rau cov neeg ua haujlwm raug mob thaum kho.Yog li ntawd, cov ntsiab lus ntawm mercury yuav tsum nruj me ntsis txwv.Kev tshem tawm mercury yog ua raws li cov tshuaj tiv thaiv ntawm mercury thiab sulfur hauv lub catalytic reactor.
Hnyav hydrocarbon: hais txog hydrocarbons saum C5 +.Hauv hydrocarbons, thaum qhov hnyav molecular hloov ntawm qhov me mus rau qhov loj, nws qhov kub kub hloov ntawm qhov qis mus rau qhov siab.Yog li ntawd, nyob rau hauv lub voj voog ntawm condensing natural gas, hnyav hydrocarbons yeej ib txwm condensed ua ntej.Yog tias qhov hnyav hydrocarbon tsis tau sib cais ua ntej, lossis sib cais tom qab condensation, qhov hnyav hydrocarbon yuav khov thiab thaiv cov khoom siv.Hnyav hydrocarbons yog ib feem tshem tawm los ntawm molecular sieve thiab lwm yam adsorbents thaum lub sij hawm lub cev qhuav dej, thiab tus so yog sib cais los ntawm cryogenic sib cais.
Cos: nws tuaj yeem hydrated los ntawm cov dej me me los ua H2S thiab CO2, ua rau cov khoom siv corrosion.Ib qho yooj yim mus sib tov nrog zoo propane.Nws feem ntau raug tshem tawm ua ke nrog H2S thiab CO2 thaum lub sij hawm deacidification.
Helium: cov pa roj ntsha yog lub hauv paus ntawm helium thiab yuav tsum tau muab cais thiab siv.Nws muaj txiaj ntsig zoo siv los ntawm kev sib xyaw ua ke ntawm cov membrane sib cais thiab kev sib cais cryogenic.
Nitrogen: qhov nce ntawm nws cov ntsiab lus yuav ua rau natural gas liquefaction nyuaj dua.Txoj kev flash kawg yog feem ntau siv rau kev xaiv tshem tawm ntawm LNG.
Lub ntsiab ntawm cov pa roj carbon monoxide yog methane (CH4), thiab nws cov qauv kub kub yog 111k (- 162 ℃).
Qhov ceev ntawm cov kua methane ntawm tus qauv boiling point yog 426kg / m3, thiab qhov ceev ntawm gaseous methane ntawm lub xeev tus qauv yog 0.717kg / m3, nrog rau qhov sib txawv ntawm txog 600 zaug.Qhov sib txawv loj hauv ntim yog qhov laj thawj tseem ceeb rau liquefied natural gas cia thiab tsheb thauj mus los.


Post lub sij hawm: Dec-03-2021