MODEL GASIFIKASI BIOMASSA MENGGUNAKAN PENDEKATAN KESETIMBANGAN TERMODINAMIKA STOIKIOMETRIS DALAM MEMPREDIKSI GAS PRODUSER

Hafid Alwan

Abstract


Reaksi dalam sistem gasifikasi meliputi reaksi oksidasi, bouduard, WGR, WGSR, dan metanasi. Reaksi-reaksi tersebut dapat dimodelkan melalui kesetimbangan reaksi termodinamika untuk memprediksi komposisi gas produser. Biomassa digambarkan sebagai CHxOyNz dengan agen pengoksidasi berupa udara. Produk gasifikasi yang disebut dengan gas produser terdiri atas gas CO, CO2, H2, CH4 dan N2. Model yang digunakan untuk memperkirakan gas produser adalah model homogen atau model schlapfer. Dalam model ini, persamaan reaksi yang dijadikan model reaksi adalah reaksi water gas shift (WGSR). Reaksi tersebut dapat memprediksi hampir seluruh komposisi gas produser didalam sistem gasifikasi. Rasio udara terhadap bahan bakar yang digunakan (AFR) sebesar 0,3. Nilai konstanta kesetimbangan termodinamik dari model ini sebesar K = 0,262 pada suhu kesetimbangan gasifikasi 1073K. Komposisi gas produser yang dihasilkan dari model ini yaitu CO= 24,55 %-mol H2= 12,81 %-mol CO2= 6,89 %-mol H2O= 13,74 %-mol  dan N2= 40 %-mol.


Keywords


Biomasa, Gasifikasi, Kesetimbangan termodinamik, Stoikiometris

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DOI: http://dx.doi.org/10.36055/jip.v8i1.5597

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