Proces proizvodnje tekočega zraka z izrabo kriogene energije uplinjanja utekočinjenega zemeljskega plina : magistrsko delo

Kramberger, Rok

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Title:	Proces proizvodnje tekočega zraka z izrabo kriogene energije uplinjanja utekočinjenega zemeljskega plina : magistrsko delo
Authors:	ID Kramberger, Rok (Author) ID Goričanec, Darko (Mentor) More about this mentor... ID Urbancl, Danijela (Comentor)
Files:	MAG_Kramberger_Rok_2023.pdf (4,21 MB) MD5: 6A512CD75D38D8E97136BCF2DAB10574
Language:	Slovenian
Work type:	Master's thesis/paper
Typology:	2.09 - Master's Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	Kriogeno shranjevanje energije predstavlja eno izmed perspektivnih procesov shranjevanja odvečne energije. Na svetu je vse bolj aktualen ladijski transport zemeljskega plina, ki je zaradi specifike transporta utekočinjen. V terminalih UZP, do katerih poteka transport UZP, je potreben proces, pri katerem poteka uplinjanje UZP, ki se ga nato uvaja v visokotlačno transmisijsko plinovodno omrežje. Nam najbližji terminal uplinjanje UZP je na Hrvaškem otoku Krk, v kraju Omišalj. Pri procesu fazne spremembe zemeljskega plina iz tekočega v plinasto, je potrebno veliko energije, ki je potrebna za proces uplinjanja UZP in za uplinjanje izkorišča toploto morske vode. Višek proizvedene kriogene energije se izkoristi za proizvodnjo električne energije, s pomočjo turbin in znaša približno 840.000 kJ ton-1 UZP. Za povečanja izkoristka kriogene energije uplinjanja UZP, je ustrezna soproizvodnja tekočega zraka, ki izkorišča kriogeno temperaturo UZP, ki je približno enaka temperaturi utekočinjenega zraka. V magistrskem delu je opravljena računalniška simulacija proizvodnje tekočega zraka, z izrabo kriogene energije uplinjanja UZP, z 3 različnimi modeli, pri različnih obratovalnih pogojih procesa. Računalniška simulacija je izvedena s programskim paketom Aspen Plus. Soproizvodnja tekočega zraka je smiselna pri modelu s frakcionirno destilacijo. Specifična entalpija znaša 320 kJ kg-1. Prav tako se zmanjša poraba energije procesa, ki znaša 281.634 kW. Uničena eksergija znaša 108,03 kJ na kg UZP. Letno povečanje prihodka procesa je 2,34 M€ in dobiček od procesa je 2,18 M€. Stroški investicije znašajo 2,76 M€, pri obratovalni stroških 638.000 €. Dodatno izboljšanje procesa je možno z uporabo tekočega dušika kot hladiva, ki zmanjša investicijske in obratovalne stroške procesnih naprav.
Keywords:	utekočinjen zemeljski plin, utekočinjen zrak, kriogena energija, frakcionirna destilacija, terminal UZP, izraba kriogene energije.
Place of publishing:	Maribor
Place of performance:	Maribor
Publisher:	[R. Kramberger]
Year of publishing:	2023
Number of pages:	1 spletni vir (1 datoteka PDF (XIV, 69 f.))
PID:	20.500.12556/DKUM-85058
UDC:	621.6.036:536.483(043.2)
COBISS.SI-ID:	170147587
Publication date in DKUM:	06.09.2023
Views:	620
Downloads:	73
Metadata:
Categories:	KTFMB - FKKT
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Licences

License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International

Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:	17.08.2023

Secondary language

Language:	English
Title:	Liquid air production process using the cryogenic energy of liquefied natural gas gasification
Abstract:	Cryogenic energy storage is one of the suitable process for storing excess energy. The shipping of natural gas, which is liquefied due to the nature of the transport, is becoming more and more important in the world. The LNG terminals to which LNG is transported require a process that gasifies the LNG, which is then introduced into a high-pressure transmission pipeline network. The closest LNG regasification terminal to us is on the Croatian island of Krk in Omišalj. The process of phase change of natural gas from liquid to gaseous requires a large amount of energy for the LNG gasification process and uses the heat of seawater for gasification. The cryogenic energy produced is used to generate electricity through turbines and amounts to approximately 840,000 kJ ton-1 of LNG. To maximise the cryogenic energy efficiency of LNG gasification, liquid air cogeneration is suitable to exploit the cryogenic temperature of LNG, which is approximately equal to the temperature of liquefied air. In the master thesis, a computer simulation of liquid air production by utilising the cryogenic energy of LNG gasification is carried out with 3 different models at different process operating conditions. The computer simulation is performed with the Aspen Plus software package. Co-production of liquid air makes sense in a fractional distillation model. The specific enthalpy is 320 kJ kg-1. The energy consumption of the process is also reduced, which amounts to 281,634 kW. The exergy destroyed amounts to 108,03 kJ per kg of LNG. The annual increase in process revenue is 2,34 M€. The profit from the process is 2,18 M€. The investment cost is 2,76 M€ and the operating cost is 638.000 €. Further process improvement is possible by using liquid nitrogen as a coolant, which reduces the capital and operating costs of the process plant.
Keywords:	Liquefied natural gas, Liquefied air, Cryogenic energy, Fractional distillation, LNG terminal, Cryogenic energy recovery

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