The Recovery of Energy, Nitrogen and Phosphorous from Three Agricultural Wastes by Pyrolysis

• Published in: Energy procedia Vol. 105; pp. 1263 - 1269
• Main Authors: Wu, Daohong, Xiao, Lei, Ba, Yuxin, Wang, Huihui, Zhang, Anqiang, Wu, Xiaofei, Niu, Mingjie, Fang, Kai
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.01.2017
• Subjects: Agricultural waste; Energy; Nitrogen; Phosphorus; Pyrolysis; Recovery; Pyrolysis; Phosphorus; Agricultural waste; Energy; Nitrogen; Recovery
• ISSN: 1876-6102; 1876-6102
• DOI: 10.1016/j.egypro.2017.03.445

Pyrolysis of three agricultural wastes (rice straw, maize straw and wheat straw) in a shenwu heat-carrier-free rotating bed reactor was investigated in this study. The experiments were carried out at different pyrolysis temperatures, and the maximum gas yields achieved were 31.6%, 29.8% and 33.1% for rice straw, maize straw and wheat straw, respectively. The highest caloric values of gas were obtained at 700°C, which was 3462.78 kcal/Nm3 for rice straw, 4087.62 kcal/Nm3 for maize straw and 3369.57 kcal/Nm3 for wheat straw. The elemental composition of the biochar was analyzed, and the results show that a low temperature was appropriate for the nitrogen and phosphorus enrichment in char. However, a high temperature was benefit for the bio-gas yield and caloric value. It can be concluded that the recovery of nitrogen, phosphorous in biochar and energy as gas could achieve a balance at the 500°C for three crop straws.