School of Environment, Harbin Institute of Technology, Harbin 150090, PR China; School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen 518055, PR China.
School of Environmental Science and Engineering, Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control, Southern University of Science and Technology, Shenzhen 518055, PR China; Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City, Shenzhen 518055, PR China.
Waste Manag. 2021 Feb 15;121:354-364. doi: 10.1016/j.wasman.2020.12.028. Epub 2021 Jan 7.
Syngas production from biomass gasification is a promising technology, which is widely used in the chemical industry. Crop straw and red mud are typical agricultural and industrial wastes, respectively, which are cheap and widespread; however, they cause serious environmental pollution due to the open burning of straw and the toxicity and alkalinity of red mud. In the present work, we converted crop straw into syngas by chemical looping gasification using red mud as a sinter-resistant oxygen carrier. The reactivity of red mud, the syngas yields, and the air pollutant emissions under different conditions were systematically investigated through a thermo-gravimetric analyzer and mass spectrometer. Compared with pure FeO, red mud can promote the syngas yields from crop straw gasification owing to the presence of inert AlO and SiO. Red mud can effectively reduce the emission of air pollutants owing to the presence of alkaline components such as CaO and NaO. As the FeO/fuel mass ratio increases, the syngas yield increases and the air pollutant emissions simultaneously reduce; whereas the syngas yield and the air pollutant emissions decrease with increasing heating rate. After calcination at high temperature, the structure of red mud remains stable with slight agglomeration, and can be easily regenerated. Therefore, the promising results provide a breakthrough for efficient utilization and disposal of both crop straw and red mud.
生物质气化合成气生产是一项有前途的技术，广泛应用于化学工业。农作物秸秆和赤泥分别是典型的农业和工业废物，它们价格低廉、分布广泛；但由于秸秆的露天焚烧和赤泥的毒性和碱性，会造成严重的环境污染。在本工作中，我们使用赤泥作为抗烧结氧载体，通过化学循环气化将农作物秸秆转化为合成气。通过热重分析仪和质谱仪系统地研究了赤泥的反应性、不同条件下的合成气产率和空气污染物排放。与纯 FeO 相比，由于惰性 AlO 和 SiO 的存在，赤泥可以促进农作物秸秆气化合成气的产率。由于存在 CaO 和 NaO 等碱性成分，赤泥可以有效减少空气污染物的排放。随着 FeO/燃料质量比的增加，合成气产率增加，同时空气污染物排放量减少；而随着加热速率的增加，合成气产率和空气污染物排放量均降低。高温煅烧后，赤泥的结构保持稳定，略有团聚，易于再生。因此，有前景的结果为有效利用和处理农作物秸秆和赤泥提供了突破。
