Ravnotežni model uplinjanja biomase s kisikom

magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo

Jaka Bizjak (Author), Andrej Senegačnik (Mentor), Marko Matkovič (Co-mentor)

Abstract

V magistrski nalogi je analitično analiziran vpliv razmernika zraka in volumskega deleža kisika v s kisikom obogatenim zrakom pri uplinjanju biomase na sestavo produktnega plina, temperaturo in izkoristek uplinjanja ter količino in spodnjo kurilnost produktnega plina. Analiza je izvedena z ravnotežnim nestehiometričnim modelom, izdelanim v Pythonu, pri čemer se kemijsko ravnotežje izračuna z odprtokodnim modulom Reaktoro. Rezultati analize kažejo, da se najvišji deleži gorljivih komponent produktnega plina dosežejo s 95-odstotnim volumskim deležem kisika v obogatenem zraku. Pri enakem deležu kisika in razmerniku zraka 0,26 se dosežeta tudi najvišji izkoristek uplinjanja (87,5 %) in spodnja kurilna vrednost produktnega plina (13,8 MJ/kg). Ob upoštevanju rabe energije za separacijo kisika iz zraka, se najvišji izkoristek zniža na 85,7 % in doseže pri 58-odstotnem deležu kisika, spodnja kurilna vrednost pa znaša 11,8 MJ/kg. Analiza je pokazala tudi, da je pri modeliranju sestave produktnega plina treba pravilno predpostaviti delež trdnega ostanka ogljika. Predpostavka konstantnega 5-odstotnega deleža ostanka v celotnem analiziranem območju preceni delež CH4 in posledično izkoristek ter kurilno vrednost produktnega plina v območjih nizkih razmernikov zraka.

Keywords

magistrske naloge;uplinjanje;biomasa;ravnotežni model;prosta gibbsova energija;s kisikom obogaten zrak;

Data

Language:	Slovenian
Year of publishing:	2025
Typology:	2.09 - Master's Thesis
Organization:	UL FS - Faculty of Mechanical Engineering
Publisher:	[J. Bizjak]
UDC:	536.422.1:662.63:004.942(043.2)
COBISS:	230985475
Views:	124
Downloads:	79
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Equilibrium model of biomass gasification with oxygen-enriched air
Secondary abstract:	Master's thesis analytically analyses influence of equivalence ratio and oxygen content in oxygen-enriched air in biomass gasification on the composition of product gas, temperature, efficiency of gasification, amount, and lower heating value of the product gas. The analysis is performed using an equilibrium non-stoichiometric model created in Python, where chemical equilibrium was calculated using the open-source module Reaktoro. Results of the analysis show that the highest volume fractions of combustible components in the product gas are achieved with a 95 % oxygen content in the enriched air. At the same oxygen content and equivalence ratio of 0.26, highest gasification efficiency (87.5 %) and lower heating value of the product gas (13.8 MJ/kg) are also achieved. Taking into account energy consumption for air separation, highest efficiency decreases to 85.7 % and is achieved at 58 % oxygen content, and lower heating value is 11.8 MJ/kg. The analysis also showed that when modelling the composition of the product gas, it is necessary to correctly assume the proportion of solid carbon residue. The assumption of a constant 5 % residue fraction in the entire analysed area overestimates the volume fractions of CH4 and consequently the efficiency and heating value of the product gas in areas of low air ratios.
Secondary keywords:	master thesis;gasification;biomass;equilibrium model;gibbs free energy;oxygen-enriched air;
Type (COBISS):	Master's thesis/paper
Study programme:	0
Thesis comment:	Univ. Ljubljana, Fak. za strojništvo
Pages:	XX, 59 str.
ID:	26131467