Rice Straw Carbonizer: Potential Technology for Carbonized Rice Straw Production
Vol. 8 No. 1 (2024), Guidelines for AI Use
Vol. 8 No. 1 (2024)

Rice Straw Carbonizer: Potential Technology for Carbonized Rice Straw Production

Guidelines for AI Use
Published 2024-09-30
John Eric Abon
Rice Engineering and Mechanization Division, Philippine Rice Research Institute, Maligaya, Science City of Muñoz, 3119 Nueva Ecija, Philippines
Romeo Gavino
Department of Agricultural and Biosystems Engineering, College of Engineering, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
Jeffrey Lavarias
Department of Agricultural and Biosystems Engineering, College of Engineering, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
Claire Marie Castillo
Department of Agricultural and Biosystems Engineering, College of Engineering, Central Luzon State University, Science City of Muñoz, Nueva Ecija, Philippines
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Keywords

Air Velocity
Open Burning
Moisture Content
Fuel Gas Analysis
Biomass
Pyrolysis

Abstract

Rice straw, the vegetative remnants of the rice plant, often discarded after harvest, faces issues when subjected to open burning, including loss of soil nutrients, moisture, pollution, and threats to nearby structures. The method of charcoal making involves biomass pyrolysis to produce biochar, effectively removing CO2 from the atmosphere. This study aimed to optimize biochar production using a locally designed rice straw carbonizer, accommodating 10 kg of material. Two moisture content samples, 8.90% and 11.70%, were examined for the carbonizer's performance, evaluating operation time, biochar yield, output capacity, air velocity, gas emissions, temperature, and cost. Findings revealed a biochar yield of 21.89% and an output capacity of 13.87 kg/hr for 8.90% moisture content, and 19.11% yield with 9.41 kg/hr output for 11.70% moisture content. The average operation time was 73.33 and 109.44 minutes for 8.90% and 11.70% moisture content, respectively, with a maximum temperature of 733.80°C. Air velocity averaged 0.70 m/s and 0.52 m/s for the two moisture levels. Flue gas analysis indicated the influence of moisture content on gas composition, with smaller valve openings leading to higher values. Cost analysis suggested a potential reduction in biochar production costs from PhP 12.60 to PhP 6.34 per kg by increasing processed rice straw from 5 to 12 tons annually. At a custom rate of PhP 8.00 per kg, processing 12 tons per year could yield approximately 2,672 kg of biochar. This research offers insights into enhancing biochar production efficiency and cost-effectiveness through moisture content adjustments and increased processing scale.

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