KAJIAN TEKNIS-EKONOMIS ALAT PENGERING PATI SAGU MODEL CROSS FLOW VIBRO FLUIDIZED BED (Study on Technical-Economic of Sago Starch Dryer Model of Cross Flow Vibro Fluidized Bed)

Abstract

The purpose of this research was to evaluate performance of vibro cross flow fluidized bed dryer using biomass fuel for drying sago starch. The phase of research were evaluation of dryer heated by a biomass stove using coconut shell as a fuel and observation of the drying temperature, moisture content, drying time, energy analysis, and drying effiviency, as well as calculation of its economic analysis. The dryer has dimension of 200x50x1500 cm for length, width, hight, respectively, and working capacity of 35kg/process. The results showed that biomass fuel consumption for drying sago starch for 7 hours was 12740,00 MJ (70 kg/process) and electricity consumption for blower and vibrator was 37,80 MJ. Furthermore, the dryer reduced moisture content of sago starch from 42% (wb) to 12% (wb) with temperature in the vibrator chamber of 40-60 oC and relative humidity of 50%, as well as ambient temperature of 30 3C and drying efficiency of 46,02%. Economic analysis showed that the dryer had NPV of Rp. 16.002.858, BCR of 1,53, IRR of 35%, and PBP of 3,51 years. Keywords: Cross flow, vibro fluidized bed dryer, biomass stoves, sago starch, financial analysis ABSTRAK Tujuan penelitian ini adalah melakukan pengujian terhadap alat pengering pati berbasis sagu model cross flow vibrofluidized bed bertenaga biomassa. Tahapan penelitian meliputi pengujian alat pengering menggunakan tungku biomassa berbahan bakar tempurung kelapa dengan melakukan pengamatan suhu selama pengeringan, penurunan kadar air, waktu pengeringan, kebutuhan energi, efisiensi pengering, dan analisis finansial. Konstruksi alat pengering pati sagu model vibro fluidized bed bertenaga biomassa berukuran panjang, lebar dan tinggi masing-masing (200x50x1500) cm, serta memiliki daya tampung atau kapasitas maksimum pati sagu basah 35 kg/proses. Hasil pengujian menunjukkan bahwa alat pengering ini mampu mengeringkan pati sagu selama 7 jam, dengan konsumsi bahan bakar tempurung kelapa sebanyak 70 kg/proses (1274MJ), kebutuhan daya listrik untuk tenaga blower dan vibrator(37,80 MJ), serta mampu menurunkan kadar air pati sagu dari 42%bb menjadi 12%bb dengan suhu dalam ruang vibrator adalah 40-60 oC, RH 50%, suhu lingkungan 30C dan efisiensi pemanasan (pengeringan) 46,02%.Hasil analisis finansial menunjukan bahwa investasi alat pengering vibro fluidized bedsangat layak dilaksanakan berdasarkan kriteria NPV = Rp. 16.002.858, BCR= 1,53, IRR= 35%, dan PBP tertutupi setelah 3,51 tahun. Kata kunci: Aliran silang, vibro fluidized bed dryer, tungku biomassa, pati sagu, analisis finansial