Flash Joule Heating Machine: Flash Joule heating drives the conversion of lignin into high-quality graphitic carbon

Similarity of technical principles and applications

High-temperature thermal shock and material transformation: Dong Zhiguo and others used flash Joule heating (FJH) technology to efficiently convert lignin into high-quality graphite carbon (LFG), and achieved structural reorganization in a very short time by rapidly heating the material to above 3000K. Flash Joule Heating Machine (FJH) technology can also quickly heat the material to a high temperature, trigger chemical reactions inside the material or with external substances, and achieve rapid synthesis and structural transformation of the material. Both use the violent reaction conditions brought about by high-temperature thermal shock to promote the efficient transformation of the target material.

Rapid heating and energy efficiency advantages: FJH technology achieves rapid and efficient energy conversion by directly heating the material with electricity, avoiding energy loss in traditional heating methods, and has the characteristics of high energy efficiency. In the research of Dong Zhiguo and others, FJH technology not only demonstrated energy efficiency advantages in lignin conversion, but also has broad industrial application prospects.

Complementarity of technical advantages

Environmental friendliness: FJH technology does not require the use of solvents or reaction gases during material synthesis, and has low energy consumption, making it an environmentally friendly preparation method. In the research of Dong Zhiguo and others, FJH technology also avoids the high energy consumption and environmental pollution problems in the traditional high-temperature carbonization process, which meets the current requirements of environmental protection and sustainable development.

Process flexibility and scalability: FJH technology has good process flexibility, and can achieve precise control of the material preparation process by changing parameters such as current density and heating time. Dong Zhiguo and others optimized the graphitization effect of lignin by adjusting voltage and heating time, demonstrating the scalability of FJH technology in the transformation of different materials

Combination direction of future research and application

Introduction and optimization of catalysts: Catalysts can be introduced into the lignin transformation process treated by FJH technology to further reduce the initial energy demand and enhance the lignin conversion efficiency. For example, transition metal catalysts (such as Fe, Ni, Co) are used to promote the decomposition and graphitization of lignin.

Efficient utilization and comprehensive development of by-products: The FJH process can not only generate high-quality graphite carbon, but also produce by-products such as hydrogen-rich syngas and aromatic monomers. Combined with the rapid synthesis capability of FJH technology, it is possible to explore the efficient utilization of these by-products in energy, chemical and other fields, and realize the full component conversion and value maximization of lignin.

Optimization and standardization of process parameters: In-depth study of the synergistic mechanism of FJH technology in the process of different material conversion, optimization of process parameters, such as heating temperature, heating time, current density, etc. Establish standardized process flow to ensure the stability and consistency of material performance and conversion efficiency, and provide reliable technical guarantee for the large-scale application of lignin conversion and carbon material production.

Electrospinning Nanofibers Article Source:

https://doi.org/10.1016/j.cej.2024.158813