Utilization of upgraded biomass feedstocks for energy generation
Partial substitution of coal by renewable biomass in existing coal-fired boilers for power generation is increasingly attractive because of the depletion of fossil fuels and the current concerns over climate change.However,previous studies related to biomass-coal co-processing have identified several technical constraints caused by the inherent properties of biomass materials,and the relatively poor fuel quality of biomass feedstocks compared to coal.We have recently developed a technology based on hydrothermal carbonization (HTC) to upgrade raw biomass feedstocks of different types.The resultant hydrochar has homogenized properties such as uniform density and size,and also possesses increased fuel quality in comparison to raw biomass.In addition,co-processing of coal and hydrochar leads to improved fuel-to-energy efficiency and reduced pollutant emissions.These results can be attributed to similarity of fuel quality and synergistic interactions between hydrochar and coal during the co-combustion process,resulting in high combustion efficiency of the hydrochar-coal blends.Moreover,the addition of hydrochar to coal significantly decreased the total nitrogen percentage in the char,promoted the conversion of gaseous nitrogen compounds into N2 and suppressed the formation of high-ring polycyclic aromatic hydrocarbons (PAHs) in tars than those in tars from coal combustion alone.These findings suggest that the co-processing of hydrochar-coal blends for energy production had multiple benefits such as increased combustion efficiency and decreased emissions of harmful air pollutants.
Rajasekhar Balasubramanian Zhengang Liu
Department of Civil and Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, EL4 07-03, 117576 Singapore
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
725-725
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）