magistrsko delo
David Tian Hren (Avtor), Miloš Bogataj (Mentor), Andreja Nemet (Komentor)

Povzetek

Ogljikov dioksid (CO2) je glavni toplogredni plin, ki prispeva h globalnemu segrevanju. Pretvorba emisij CO2 v tekoča goriva, kot je metanol, je obetavna tehnologija za zmanjšanje emisij ogljika in proizvodnjo uporabnih goriv. Metanol je vsestransko gorivo, ki se lahko uporablja v motorjih z notranjim zgorevanjem, gorivnih celicah in kot surovina za proizvodnjo različnih kemikalij. Vendar pa se večina metanola trenutno proizvaja iz fosilnih goriv, kar ni trajnostno. Sinteza metanola iz CO2 prek fotokatalitskih, elektrokemičnih in kemičnih metod ponuja potencialno rešitev za trajnostno proizvodnjo metanola in zmanjšanje emisij CO2. Cilj magistrskega dela je bil v programu Aspen Plus izvesti simulacijo procesa proizvodnje metanola iz ogljikovega dioksida in vode kot vira vodika. Za zajem CO2 smo uporabili postopek absorpcije z monoetanolaminom (MEA), ki je široko uporabljana tehnologija za zajemanje CO2 iz industrijskih dimnih plinov. Nato smo vodik, potreben za sintezo metanola, pridobivali z alkalno elektrolizo vode, ki je ena najstarejših in najbolj razširjenih metod za proizvodnjo vodika iz obnovljivih virov. Zajeti ogljikov dioksid in proizvedeni vodik smo nato na dva načina pretvorili v metanol s postopkom hidrogeniranja CO2, in sicer z direktno in dvostopenjsko sintezo. Pri direktni pretvorbi smo izvedli neposredno hidrogeniranje CO2 v metanol. Pri dvostopenjski pretvorbi pa smo CO2 najprej pretvorili v CO z reakcijo RWGS, nato pa smo mešanico CO in CO2 hidrogenirali v metanol. Poleg simulacije procesa smo izvedli tudi analizo porabe pogonskih sredstev ter njunih stroškov ter občutljivostno analizo glede na temperaturo v reaktorju in vhodni tok vodika. Rezultati kažejo, da ima direktna sinteza večji donos metanola (63,56 t/h) v primerjavi z dvostopenjsko sintezo (62,70 t/h), vendar le za 1,4 %. Direktna sinteza porabi 147,9 MW energije, medtem ko dvostopenjska sinteza porabi 175 MW. Ta razlika znaša 15,5 % oziroma 27,1 MW, kar pomeni letni prihranek v višini 2,2 milijona dolarjev.

Ključne besede

moč-do-X;Aspen Plus;metanol;zajemanje CO2;zajemanje ogljikovega dioksida;prozvodnja metanola;elektroliza vode;

Podatki

Jezik: Slovenski jezik
Leto izida:
Tipologija: 2.09 - Magistrsko delo
Organizacija: UM FKKT - Fakulteta za kemijo in kemijsko tehnologijo
Založnik: [D. T. Hren]
UDK: 661.721.091.3(043.2)
COBISS: 212472323 Povezava se bo odprla v novem oknu
Št. ogledov: 101
Št. prenosov: 23
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Angleški jezik
Sekundarni naslov: Methanol production from carbon dioxide - comparison between two synthesis paths
Sekundarni povzetek: Carbon dioxide (CO2) is a major greenhouse gas that contributes to global warming. The conversion of CO2 emissions into liquid fuels, such as methanol, is a promising technology for reducing carbon emissions and producing usable fuels. Methanol is a versatile fuel that can be used in internal combustion engines, fuel cells, and as a feedstock for the production of various chemicals. However, most methanol is currently produced from fossil fuels, which is not sustainable. The synthesis of methanol from CO2 via photocatalytic, electrochemical, and chemical methods offers a potential solution for the sustainable production of methanol and the reduction of CO2 emissions. The aim of this master's thesis was to simulate the process of methanol production from carbon dioxide and water as a source of hydrogen in Aspen Plus. For CO2 capture, we used the monoethanolamine (MEA) absorption process, which is a widely used technology for capturing CO2 from industrial flue gases. The hydrogen required for methanol synthesis was obtained by alkaline water electrolysis, which is one of the oldest and most widespread methods for hydrogen production from renewable sources. The captured carbon dioxide and the produced hydrogen were then converted into methanol by the process of CO2 hydrogenation in two ways, namely by direct and two-step synthesis. In the direct conversion, we performed direct hydrogenation of CO2 to methanol. In the two-step conversion, CO2 was first converted to CO by the RWGS reaction, and then the mixture of CO and CO2 was hydrogenated to methanol. In addition to the process simulation, we also performed an analysis of the consumption of utilities and their costs, as well as a sensitivity analysis with respect to the reactor temperature and the inlet hydrogen flow. The results show that direct synthesis has a higher yield of methanol (63,56 t/h) compared to two-step synthesis (62,70 t/h), but only by 1.4%. Direct synthesis consumes 147,9 MW of energy, while two-step synthesis consumes 175 MW. This difference amounts to 15,5% or 27,1 MW, representing an annual saving of 2,2 million dollars.
Sekundarne ključne besede: power-to-X;Aspen Plus;methanol;CO2 capture;carbon dioxide capture;methanol production;water electrolysis;
Vrsta dela (COBISS): Magistrsko delo/naloga
Komentar na gradivo: Univ. v Mariboru, Fak. za kemijo in kemijsko tehnologijo, Kemijsko inženirstvo
Strani: 1 spletni vir (1 datoteka PDF (X, 76 f.))
ID: 24534058