Frontiers Journal of Renewable energy

Microwave-assisted Catalytic Fast Pyrolysis Process And System For Renewable Energy Production From Solid Wastes


Microwave-assisted pyrolysis (MAP) is an alternative conversion method to extract the energy and produce value-added products from solid wastes. Microwave-assisted technology has many advantages comparing with conventional conversion methods, such as more uniform heating at molecular level, process flexibility and equipment portability, lower thermal inertia and faster response, low capital cost and more energy efficient. In this presentation, a continuous fast microwave-assisted pyrolysis and gasification process and system will be introduced. The process and system is designed, fabricated, and tested for various solid wastes such as lignocellulosic biomass and recycled plastics. The system is equipped with continuous waste raw material feeding, mixing of feedstock and microwave absorbent, and a separated catalytic upgrading step. For microwave gasification of lignocellulosic biomass, extremely high temperature (>1200 °C) can be obtained efficiently when combining with microwave absorbents, making the gas product much cleaner than in lower temperature and the energy consumption much lower than that of traditional fluidized bed gasifier. With this process, it is possible to obtain a H2-rich gas with low tar content, and can be usable in cogeneration systems, F-T synthesis, or fuel cells. For microwave pyrolysis of waste plastics for hydrocarbon fuel production, the two-step microwave catalytic pyrolysis improved the bio-oil quality; help produced the liquid product with high heating value (HHV). There are clear potentials for commercializing the microwave-assisted catalytic pyrolysis and gasification process and system for complete solid waste utilization.