Resonant cavity for verifying wood microwave pretreatment temperature distribution

Abstract

The invention discloses a resonant cavity for verifying wood microwave pretreatment temperature distribution. The resonant cavity for verifying wood microwave pretreatment temperature distribution comprises a main resonant cavity which is arranged horizontally; at least one fed-in waveguide is arranged on the main resonant cavity in the lateral direction; the main resonant cavity is connected with the fed-in waveguides; the fed-in waveguides are horizontally distributed along the direction from the center of the main resonant cavity to the outside; hollow-out openings are respectively formed in two end surfaces of each fed-in waveguide; the cross section of each fed-in waveguide is rectangular; the length direction of the rectangular cross section of each fed-in waveguide is a horizontal direction; the width direction of the rectangular cross section of each fed-in waveguide is a vertical direction; and the distance from the hollow-out opening of one end, which is far away from the center of the main resonant cavity, of each fed-in waveguide to the center of the main resonant cavity is 1.1 times greater than the length of the rectangular cross section of the fed-in waveguide. The resonant cavity for verifying wood microwave pretreatment temperature distribution has the advantages that wood microwave energy utilization rate is high, microwave energy is dispersed uniformly, temperature distribution uniformity is high, and wood breaking rate is low.

Description

technical field [0001] The invention relates to the technical field of microwave pretreatment of wood, in particular to a resonant cavity for verifying the temperature distribution of microwave pretreatment of wood. Background technique [0002] The area and stock volume of fast-growing plantations in my country rank first in the world, but fast-growing wood generally has defects such as poor permeability, drying and post-corrosion, and difficulty in flame-retardant treatment, so that the high value-added utilization of solid wood has not made breakthrough progress. [0003] High-intensity microwave pretreatment is a new technology that has appeared in the field of wood modification in recent years. Its basic principle is to use high-intensity microwaves to treat wet wood instantaneously, so that the moisture in the wood can obtain enough energy in a short time to produce phase change. And gas thermal pressure effect, driven by steam expansion power, destroys the internal st...

AI Technical Summary

Problems solved by technology

Although the microwave of the traveling wave heater can be absorbed by the wood through multiple reflections, the temperature distribution on the cross-section of the wood cannot be improved

Because the microwave energy of the traveling wave heater is relatively concentrated at the feed port, the local high temperature produces a wood cracking rate

Although the microwave energy utilization rate of the traveling wave heater is high, the temperature distribution uniformity is not ideal and the wood cracking rate is high, so it is not the best choice

Images