期刊
WASTE MANAGEMENT
卷 141, 期 -, 页码 16-26出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2022.01.013
关键词
Mixed food waste; Fast pyrolysis; Fluidized-bed; Torrefaction; CO2 utilization
资金
- Korea Institute of Energy Tech-nology Evaluation and Planning (KETEP) [20173010092430]
- Ministry of Trade, Industry, & Energy (MOTIE) of the Republic of Korea
- Korea Evaluation Institute of Industrial Technology (KEIT) [20173010092430] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The utilization of waste food to produce bio-oil through pyrolysis has gained attention, especially when the waste food is pretreated via torrefaction. Torrefaction significantly affects the pyrolysis process, resulting in higher heating values of the pyrolysis bio-oils. The application of CO2 during pyrolysis inhibits the generation of harmful substances and shows potential in energy production and environmental pollution control.
Waste food utilization to produce bio-oil through pyrolysis has received increasing attention. The feedstock can be utilized more efficiently as its properties are upgraded. In this work, the mixed food waste (MFW) was pretreated via torrefaction at moderate temperatures (250-275 degrees C) under an inert atmosphere before fast pyrolysis. The pyrolysis of torrified MFW (T-MFW) was performed in a bubbling fluidized-bed reactor (FBR) to study the influence of torrefaction on the pyrolysis product distribution and bio-oil compositions. The highest liquid yield of 39.54 wt% was observed at a pyrolysis temperature of 450 degrees C. The torrefaction has a significant effect on the pyrolysis process of MFW. After torrefaction, the higher heating values (HHVs) of the pyrolysis bio-oils (POs) ranged from 31.51 to 34.34 MJ/kg, which were higher than those of bio-oils from raw MFW (27.69-31.58 MJ/kg). The POs mainly contained aliphatic hydrocarbons (alkenes and ketones), phenolic, and N-containing derivatives. The pyrolysis of T-MFW was also carried out under the CO2 atmosphere. The application of CO2 as a carrier gas resulted in a decrease in the liquid yield and an increase in the gas product yield. In addition, the carbon and nitrogen content of POs increased, whereas the oxygen was reduced via the release of moisture and CO. Using CO2 in pyrolysis inhibited the generation of nitriles derivatives in POs, which are harmful to the environment. These results indicated that the application of CO2 to the thermal treatment of T-MFW could be feasible in energy production as well as environmental pollution control.
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