Characteristic Study of Briquette Cyanobacteria as Fuel in Chemical Looping Combustion with Hematite as Oxygen Carrier

Applied Sciences

Laihong Shen¹  Haifeng Zhang¹  Huijun Ge²  Hongcun Bai³ 

[1] Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, 2 Sipailou, Nanjing 210096, China;School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210042, China;State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;

关键词: chemical looping combustion;    densification technology;    briquette cyanobacteria;    hematite;   

DOI  :  10.3390/app11104388

来源: DOAJ

【 摘 要 】

Due to the more and more serious cyanobacteria bloom problem, it is particularly urgent to find a technology suitable for large-scale disposal and the efficient recovery of abundant nitrogen and phosphorus resources in cyanobacteria. The combination of chemical looping combustion (CLC) and biomass densification technology is thought to be a promising utilization selection. Based on the experimental results, the mechanical strength and energy density of briquette cyanobacteria are evidently increased with the compressive load; whereas, 10% is the optimal moisture content in the densification process. A higher heating rate in TGA would result in the damage of the internal structure of the briquette cyanobacteria, which are conducive to the carbon conversion efficiency. The presence of a hematite oxygen carrier would enhance the carbon conversion and catalyzed crack liquid products. CO₂ yield is increased 25 percent and CH₄ yield is decreased 50 percent at 900 °C in the CLC process. In addition, the lower temperature and reduction atmosphere in CLC would result in a lower NO emission concentration. The reactivity and porous property of hematite OC in CLC also increased during 10 redox cycle experiments. The CLC process accelerates the generation of CaH₂P₂O₇ and CaHPO₄ in cyanobacteria ash, which is more conducive to phosphorus recovery.

【 授权许可】

Unknown