Studi Numerik Pengaruh Model Reaksi Kimia Pada Gasifikasi Tiga Tingkat Terhadap Performansi Gasifikasi Refuse Derived Fuel (RDF)

Sobhri, Fiqhi Athifiyah (2022) Studi Numerik Pengaruh Model Reaksi Kimia Pada Gasifikasi Tiga Tingkat Terhadap Performansi Gasifikasi Refuse Derived Fuel (RDF). Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Refuse derived fuel (RDF) merupakan sampah yang tidak dapat diolah kembali, maka pemanfaatan RDF yaitu dikonversi menjadi bahan bakar pengganti energi fosil dengan teknologi gasifikasi. Gasifikasi adalah proses perubahan bahan bakar padat secara termokimia menjadi gas (syngas) yang flammable. Syngas yang dihasilkan oleh proses gasifikasi dapat digunakan secara langsung dengan cara dibakar, dapat digunakan sebagai bahan bakar untuk motor pembakaran dalam, ataupun digunakan sebagai bahan baku untuk proses kimia lebih lanjut. Tujuan dari penelitian ini adalah mengetahui pengaruh masukan udara tiga tingkat dengan setting temperatur menggunakan sistem kontrol terhadap kondisi operasi proses gasifikasi yang dinyatakan dalam distribusi temperatur sepanjang gasifier, dan peningkatan performansi gasifikasi yang dinyatakan dalam komposisi combustible syngas serta dapat memodelkan reaksi-reaksi pada gasifikasi dan memvalidasi hasilnya dengan hasil eksperimen. Penelitian ini dilakukan dengan metode numerik menggunakan software Ansys 19. Terdapat tiga tahap dalam melakukan simulasi numerik yaitu: preprocessing, processing, dan postprocessing. Boundary condition yang digunakan adalah air inlet pirolisis, oksidasi dan reduksi dengan 9 variasi udara masukan serta biomass inlet. Pada tahap preprocessing akan dilakukan pembuatan geometri, pembuatan meshing, dan penentuan domain pemodelan. Pada tahap processing akan dilakukan beberapa pengaturan yaitu: Models, materials, boundary conditions, operating conditions, control and monitoring conditions, serta initialize conditions. Model yang digunakan pada penelitian ini adalah model radiasi P1, viskositas standard k-epsilon, species transport, dan reaksi kimia finite rate dan finite rate/eddy dissipation. Pada tahap postprocessing diperoleh hasil simulasi berupa data kualitatif kontur atau vektor dan data kuantitatif berupa grafik maupun Tabel data. Hasil yang diperoleh dari penelitian ini adalah distribusi temperatur reaksi finite rate/eddy dissipation adalah zona drying temperaturnya menunjukkan interval sebesar 207°C-267°C, zona pirolisis menunjukkan interval temperaturnya sebesar 551°C-664°C, zona reduksi menunjukkan temperatur yang dihasilkan intervalnya sebesar 412°C-497°C. Persentase volumetrik CO tertinggi sebesar 21,6% dan terendah variasi AR 3:6:1 sebesar 17,2%. Persentase volumetrik H2 tertinggi sebesar 11,1% dan terendah sebesar 8,64%. Persentase volumetrik CH4 tertinggi adalah sebesar 6,84% dan terendah sebesar 5,03%. LHV tertinggi sebesar 6538,3 kj/kg dan terendah sebesar 5663,98 kj/kg. CGE tertinggi sebesar 83,06% dan terendah sebesar 64,18%.
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Refuse derived fuel (RDF) is waste that cannot be reprocessed, so the use of RDF is converted into a substitute fuel for fossil energy with gasification technology. Gasification is the process of thermochemically changing solid fuels into flammable gases (syngas). Syngas produced by the gasification process can be used directly by burning, can be used as fuel for internal combustion engines, or used as raw material for further chemical processes. The purpose of this study was to determine the effect of three-level air intake with temperature setting using a control system on the operating conditions of the gasification process which is expressed in the temperatur distribution along the gasifier, and the increase in gasification performance expressed in the composition of combustible syngas and can model the reactions in gasification and validate results with experimental results. This research was conducted using numerical methods using Ansys 19 software. There are three stages in performing numerical simulations, namely: preprocessing, processing, and postprocessing. At the preprocessing stage, the geometry, meshing, and the determination of the modeling domain will be carried out. In the processing stage, several settings will be made, namely: Models, materials, boundary conditions, operating conditions, control and monitoring conditions, and initialize conditions. The model used in this study is model radiation P1, viscous standard k-epsilon, species transport, and a chemical reaction model of finite rate and finite rate/eddy dissipation. Boundary conditions used are air inlet pyrolysis, oxidation and reduction with 9 variations of intake air and biomass inlet.At the postprocessing stage, simulation results are obtained in the form of qualitative contour or vector data and quantitative data in the form of graphs and data tables. The results obtained from this study are the temperatur distribution of the finite rate/eddy dissipation reaction, the drying zone temperatur shows an interval of 207°C-267°C, the pyrolysis zone shows a temperatur interval of 551°C-664°C, the reduction zone shows the resulting temperatur. the interval is 412°C-497°C. The highest volumetric percentage of CO is 21.6% and the lowest is AR 3:6:1 variation of 17.2%. The highest volumetric percentage of H2 was 11.1% and the lowest was 8.64%. The highest volumetric percentage of CH4 was 6.84% and the lowest was 5.03%. The highest LHV was 6538.3 kj/kg and the lowest was 5663.98 kj/kg. The highest CGE was 83.06% and the lowest was 64.18%.

Item Type:	Thesis (Other)
Additional Information:	RSM 662.88 Sob s-1 2022
Uncontrolled Keywords:	refuse derived fuel, gasifikasi, reaksi kimia, syngas, refuse derived fuel, gasification, chemical reaction
Subjects:	T Technology > TD Environmental technology. Sanitary engineering > TD195.B56 Biomass energy
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	13 Feb 2025 04:05
Last Modified:	13 Feb 2025 04:05
URI:	http://repository.its.ac.id/id/eprint/118712

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