A Feasibility Study on Producing Biofuels from Spent Mushroom Bag

• Main Authors: HSU,YU-MING, 許育銘
• Other Authors: TAI,HUA-SHAN
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/648x2a

碩士 === 國立高雄第一科技大學 === 環境與安全衛生工程系碩士班 === 106 === In recent years, the shortage of fossil fuels has made the international community actively develop renewable energy. Among them, biomass energy is the most commonly used renewable energy source. The amount of spent mushroom bag is large in Taiwan, and there is no ideal way to deal with it. Therefore, this study intends to assess the feasibility of the product made by methods of thermal pyrolysis, torrefaction, and RDF-5 extrusion molding into biomass fuel. Analyze the physical composition of the spent mushroom bag to sort out the substrate for basic property detection. Through the results of the tests, thermal pyrolysis, torrefaction, and RDF-5 extrusion molding experiments were set up to analyze the products of parameters such as temperature and residence time to evaluate the feasibility of producing biofuel. The results show that the spent mushroom substrate is the main source of weight for the mushroom bag, with the characteristics of low ash content, low sulfur content and high heating values with dry basis. The pyrolysis test results show that the fixed heating rate is 10 °C/min. The final temperature of 400 °C is regarded as the best parameter, and the heating value is 6,473.39 Kcal/Kg. The results of the analysed properties are close to coal. The torrefaction test results show that the fixed heating rate is 30 °C/min.It is regarded as the best parameter when the final temperature is 200 °C and the residence time is 45 minutes. The heating value is 4,748.18 Kcal/Kg. The results of the analysed properties are close to peat. RDF-5 extrusion molding results showed that under the conditions of fixed pressure 150 Kg/cm2 and temperature 120-200°C, 10% to 50% HDPE or PP plastic bags were added as additives to assist molding. Among the blending ratios, the product produced by the lower extrusion temperature has a better energy yield and volumetric energy density. The best energy yield (105.80%) obtained when the PP plastic bag blended at 50% and the extrusion temperature was 180°C. In summary, the characteristics of the spent mushroom substrat is simple, it is not easy to have subsequent treatment problems after combustion. It has the potential on producing biomass fuel and has the best energy efficiency by RDF-5 extrusion molding method, which can reduce volume and increase heating value to look forward to use it as a fuel and achieve the goal of a circular economy.