Study on Applying Biogas for Hot Water Heating System in the Hog Farm

• Main Authors: Jun-Han Mei, 眉君翰
• Other Authors: Cheng-Chang Lien
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/82400361509778744908

碩士 === 國立嘉義大學 === 生物機電工程學系研究所 === 101 === In the global climate change and promote policy about energy conservation and carbon reduction, this study developed a hot-water heating system of the hog farm using biogas-combustion which take the biogas produced from the three-stage waste-water treatment processes of the pig farms as the energy source to meet the temperature demand of the piglets and weaned pigs. This system which using the biogas from the pig farm to heat the water and let the hot-water flowed through the barn to heat exchange actually used in the farrowing house and nursery for piglets and weaned pigs insulation. First test to change the temperature and the flow of the hot water to heat the heating panel of the incubator at the farrowing house. The results showed that the temperature rising 5.2°C of the incubator which feed eight 13-day-old piglets in 25 minutes at the condition of the flow 0.043 m3/min and temperature 85°C of the hot water and the outside temperature 22°C can achieve piglets temperature requirements. Second test was to use the heat blowers to heat the closed nursery with ventilation system in different ventilation-volume ratio and air change rate per hour (ACH) and with inverter-fans ventilation system in different forced ventilation temperature and percentage of regular ventilation. Then, analyze the heating effect, temperature uniformity and the air quality of the barn. The results showed that if the closed nursery set ventilation fan with ventilation condition as ventilation-volume ratio 15% and air change rate above 10.8 ACH or set inverter-fans ventilation system with ventilation condition as the forced ventilation temperature 28°C and the percentage of regular ventilation above of 10% (1.7 ACH), it could keep the temperature, relative humidity and carbon dioxide concentration remained stable and not only achieve effective heating effect but maintain good air quality at stocking density above 1.43 pig/m2, Tset as 28°C, hot water flow and temperature as 0.043m3/min and 28°C. Modify the porous-vertical biogas burner furnace into hollow-pitched biogas-burning furnace for easy to clean the biogas product. Take the hog farm which keeping 2,000 pigs for example, if the hog farm using this heating system instead of electric-heat-lamp to warm the piglets and weaned pigs in winter, it could effectively achieve not only reducing the carbon dioxide emissions as 366 t CO2e but saving energy as 6682.1 kWh/month, and it could recover the cost of investment after five years.