Academy of Agricultural Planning and Engineering, Key Laboratory of Energy Resource Utilization from Agriculture Residue, Ministry of Agriculture and Rural Affairs, Beijing, 100125, China; College of Mechanical and Electronic Engineering, Northwest A&F University, Yangling, Shaanxi, 712100, China.
Department of Chemical and Biological Engineering, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Environ Res. 2020 Jul;186:109480. doi: 10.1016/j.envres.2020.109480. Epub 2020 Apr 8.
Microwave assisted hydrothermal treatment (MHTC) was compared with torrefaction in terms of carbonization efficiency and physicochemical characteristics of char products. The utilization of produced char was optimized for composite solid biofuel production. The results show that MHTC significantly improved the binding capability of the microwave hydrochar (MHC) particles during co-densification with unprocessed biomass and coal. One possible contributor to the improved binding is the pseudo lignin formed during the MHTC, which led to a better interlocking of the feedstock particles and promoted the solid bridge formation. Composite pellet prepared with 80 wt% of torrefaction char (TC-120), 10 wt% of microwave hydrochar (MHC-30), and 10 wt% of Coal-04 showed a higher heating value of 24.54 MJ/kg and energy density of 26.43 GJ/m, which is significantly higher than that of the raw cotton stalk pellet (16.77 MJ/kg and 18.76 GJ/m, respectively), showing great promise as a solid biofuel. The moisture resistance and oxidation reactivity are also significantly improved. The results demonstrate that MHCs provides dual functionalities in acting as binder and fuel promoter in the production of composite biofuel. This study can provide new insight into the unique functions of MHC during fuel application, which demonstrates the great potential of applying MHTC in energy recovery from lignocellulosic biomass.
微波辅助水热处理（MHTC）在碳化效率和炭产品的物理化学特性方面与热解进行了比较。优化了产生的炭的利用，以生产复合固体生物燃料。结果表明，MHTC 显著提高了微波水热炭（MHC）颗粒在与未加工生物质和煤共缩合过程中的结合能力。结合能力提高的一个可能原因是在 MHTC 过程中形成的伪木质素，这导致了原料颗粒更好的互锁，并促进了固体桥的形成。用 80wt%热解炭（TC-120）、10wt%微波水热炭（MHC-30）和 10wt%煤-04 制备的复合颗粒的高位发热量为 24.54 MJ/kg，能量密度为 26.43 GJ/m，显著高于原棉秆颗粒（分别为 16.77 MJ/kg 和 18.76 GJ/m），作为固体生物燃料具有很大的应用潜力。其耐湿性和氧化反应性也显著提高。结果表明，MHCs 在生产复合生物燃料中具有作为粘合剂和燃料促进剂的双重功能。本研究可为 MHC 在燃料应用中的独特功能提供新的见解，表明 MHTC 在从木质纤维素生物质中回收能源方面具有巨大的潜力。
