scholarly journals Modelling of syngas production from municipal solid waste (MSW) for methanol synthesis

2017 ◽  
Vol 10 (2) ◽  
pp. 107-114 ◽  
Author(s):  
Patrik Šuhaj ◽  
Jakub Husár ◽  
Juma Haydary
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Process Design ◽  
Electricity Generation ◽  
Liquid Fuel ◽  
Process Optimisation ◽  
Methanol Production ◽  
Syngas Production ◽  
Gasification Process ◽  
Refuse Derived Fuel

AbstractApproximately 1 300 Gt of municipal solid waste (MSW) are produced worldwide every year. Most of it is disposed of in landfills, which is very hazardous for the environment. Up to 10 % of produced MSW are incinerated. However, incineration is not very effective and requires specific conditions for preventing emissions. Gasification and pyrolysis are more effective processes which can be used not only for heat and electricity generation but also for fuel and valuable chemicals production. MSW can be transformed into refuse-derived fuel (RDF) which has higher heat of combustion. Synthesis gas produced by RDF gasification can be utilised in methanol production. Methanol is a very lucrative chemical which can be used as renewable liquid fuel or as a reagent in organic syntheses. Gasifier design and process optimisation can be done using a reliable mathematical model. A good model can significantly decrease the number of experiments necessary for the gasification process design. In this work, equilibrium model for RDF gasification was designed in Aspen Plus environment and the flow of oxygen and steam as gasification agents were optimised to achieve the highest theoretical methanol yield. Impact of the recycle of unreacted steam and produced tar on the methanol yield was evaluated. The highest theoretical methanol yield (0.629 kgMEOH/kgRDF) was achieved when the steam and tar recycle were switched on, the ratio between oxygen and RDF feed was 0.423 kg/kg and that between the steam and RDF feed was 0.606 kg/kg. In this case, fresh steam represented only 12 % of the total steam fed to the reactor, the rest consisted of recycled steam. Optimal gasifier temperature was 900 °C.

An Investigation Into the Syngas Production From Municipal Solid Waste (MSW) Gasification Under Various Pressures and CO2 Concentration Atmospheres

2009 ◽  
Author(s):  
Eilhann Kwon ◽  
Kelly J. Westby ◽  
Marco J. Castaldi
Keyword(s):  
Thermal Degradation ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Co2 Concentration ◽  
Operating Regime ◽  
Inert Atmosphere ◽  
Syngas Production ◽  
Gasification Process ◽  
Degradation Step ◽  
Char Burnout

The Municipal Solid Waste (MSW) gasification process is a promising candidate for both MSW disposal and syngas production. The MSW gasification process has been characterized thermo-gravimetrically under various experimental atmospheres in order to understand syngas production and char burnout. This preliminary data shows that with any concentration of carbon dioxide in the atmosphere the residual char is reduced about 20% of the original mass (in an inert atmosphere) to about 5%, corresponding to a significant amount of carbon monoxide production (0.7% of CO was produced from a 20mg sample with 100ml/min of purge gas at 825°C). Two main steps of thermal degradation have been observed. The first thermal degradation step occurs at temperatures between 280∼350°C and consists mainly of the decomposition of the biomass component into light C1–3-hydrocarbons. The second thermal degradation step occurs between 380∼450°C and is mainly attributed to polymer components, such as plastics and rubber, in MSW. The polymer component in MSW gave off significant amount of benzene derivatives such as styrene. In order to identify the optimal operating regime for MSW gasification, a series of tests covering a range of temperatures (280∼700°C), pressures (30∼45 Bar), and atmospheres (100% N2, 0∼20%CO2+Bal. N2 with/without steam) have been done and the results are presented here.

scholarly journals Simulation of biomass and municipal solid waste pellet gasification using Aspen Plus

2021 ◽  
Vol 1192 (1) ◽  
pp. 012023
Author(s):  
A D D Diallo ◽  
M F R Alkhatib ◽  
M Z Alam ◽  
M Mel
Keyword(s):  
Sensitivity Analysis ◽  
Moisture Content ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Equivalence Ratio ◽  
Energy Content ◽  
Aspen Plus ◽  
Syngas Production ◽  
Gasification Process ◽  
Gasification Temperature

Abstract The work deals with the simulation of biomass and municipal solid waste pellet gasification using Aspen Plus software. The effects of key parameters on the composition of the emitted gas are discussed, including gasification temperature, moisture content, and equivalence ratio. The sensitivity analysis was studied with the Aspen Plus Software, which includes FORTRAN modules. The simulation is validated using experimental results, which revealed that it was roughly correct. Using air as the gasification agent, the sensitivity analysis findings confirm higher temperatures promote syngas production with increased hydrogen and energy content. The simulation results demonstrated that CO2 concentration (3.95%) increases from 450°C to 600°C and then decreased drastically near 0.225kmol/hr. at 900°C. As the gasification temperature rises from 450°C to 900°C, the CO concentration rises and the H2: CO ratio falls. At 900°C, increasing the gasification temperature results in a product gas with more H2 (65%) and CO (12.43%), resulting in a higher calorific value, whereas the contents of CH4, CO2, and H2O followed an inverse correlation. CH4 decreased with temperature because of the formation of exothermic methane reactions. When the gasification process reaches 800°C, all components except CO2 become steady, and gasification reactions were achieved. The equivalence ratio (ER) ranged from 0.2 to 0.3. The gas produced by a gasifier is highly dependent on the ER value. The ER determines the gas quality, and it must be less than 1 to ensure that it gasifies the fuel rather than burnt. Moisture content was 10wt. %, this is an essential parameter for the optimum conditions during the gasification process. Moisture content determines the gas characteristics at the exit phase. The model predictions and calculated values are in good agreement.

scholarly journals Chemical Carbon and Hydrogen Recycle through Waste Gasification: The Methanol Route

2021 ◽  
Author(s):  
Alessia Borgogna ◽  
Gaetano Iaquaniello ◽  
Annarita Salladini ◽  
Emanuela Agostini ◽  
Mirko Boccacci
Keyword(s):  
Renewable Energy ◽  
Municipal Solid Waste ◽  
Solid Waste ◽  
Economic Benefits ◽  
Chemical Technology ◽  
Production Waste ◽  
Methanol Production ◽  
The Core ◽  
Gasification Process ◽  
Waste Gasification

A large amount of valuable Carbon and Hydrogen is lost in the disposal of the non-recyclable fraction of Municipal Solid Waste (MSW) – particularly unsorted waste fraction and plastics residue from mechanical recycle process. The waste-to-chemical technology allows to exploit the components entrapped in the non-recyclable waste by converting it into new chemicals. The core of waste-to-chemical technology is the gasification process, which is designed to convert waste into a valuable syngas to be used as example for methanol production. Waste to methanol schemes allow to achieve significant environmental and economic benefits, which can be further intensified within the scenario of increasing share of renewable energy.

Gasification of Municipal Solid Waste Using Tyre Char as Catalyst

2019 ◽  
Vol 797 ◽  
pp. 102-107
Author(s):  
Mizan Qistina Saharuddin ◽  
Sharifah Aishah Syed A. Kadir ◽  
Rusmi Alias
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Energy Recovery ◽  
Catalytic Performance ◽  
Catalytic Gasification ◽  
Tar Removal ◽  
Principal Problem ◽  
Syngas Production ◽  
Gasification Process ◽  
Waste Tyre

Gasification is raised as the most promising technologies of municipal solid waste (MSW) removal as well as energy recovery. The principal problem related with the gasification process is the high amount of tar released during the gasification process that causes environmental and operational problems. The purpose of this study is to investigate the performance of MSW gasification using tyre char as an alternative option for catalytic gasification to produce tar free clean gas. Catalytic performance of tyre char was compared with performance of MSW gasification alone without the tyre char in a bench scale downdraft reactor. The waste tyre char removed 80% of tars in syngas at 700 °C. Analysis of the syngas compositions indicated that concentration of H2and CO were significantly increased. Therefore, it was concluded that chars especially tyre char can be an effective and inexpensive catalyst for tar removal and syngas production of MSW gasification.

scholarly journals Characterization of Refuse Derived Fuel Production from Municipal Solid Waste: The Case Studies in Latvia and Lithuania

2020 ◽  
Vol 24 (3) ◽  
pp. 112-118
Author(s):  
Dace Âriņa ◽  
Rūta Bendere ◽  
Gintaras Denafas ◽  
Jānis Kalnačs ◽  
Mait Kriipsalu
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Calorific Value ◽  
Ash Content ◽  
Fuel Production ◽  
Heating Value ◽  
Refuse Derived Fuel ◽  
Morphological Composition ◽  
The Mean

AbstractThe authors determined the morphological composition of refuse derived fuel (RDF) produced in Latvia and Lithuania by manually sorting. The parameters of RDF (moisture, net calorific value, ash content, carbon, nitrogen, hydrogen, sulphur, chlorine, metals) was determined using the EN standards. Comparing obtained results with data from literature, authors have found that the content of plastic is higher but paper and cardboard is lower than typical values. Results also show that the mean parameters for RDF can be classified with the class codes: Net heating value (3); chlorine (3); mercury (1), and responds to limits stated for 3rd class of solid recovered fuel. It is recommended to separate biological waste at source to lower moisture and ash content and increase heating value for potential fuel production from waste.

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