Online detection method for particle concentration distribution and humidity in fluidized bed drying process

Abstract

The invention discloses an on-line detection method for particle concentration distribution and humidity in a fluidized bed drying process. The method comprises the following steps: S1, measuring the resonant frequency of a microwave resonant cavity; s2, constructing a resonant frequency response, solid particle concentration distribution and humidity relation model; s3, constructing a particle concentration distribution calibration model based on the resonant frequency response, solid particle concentration distribution and humidity relation model, the corrected Maxwell effective dielectric constant model and an ECT image reconstruction principle, and obtaining calibrated solid particle concentration distribution by using the particle concentration distribution calibration model; and S4, based on the calibrated solid particle concentration distribution and the relation model between the resonant frequency and the solid particle concentration distribution and humidity, obtaining the calibrated particle humidity. According to the invention, online continuous accurate monitoring of particle concentration distribution and humidity in the fluidized bed drying process is realized.

Description

technical field [0001] The invention relates to the technical field of solid particle detection in gas-solid two-phase flow, in particular to an online detection method for particle concentration distribution and humidity in a fluidized bed drying process. Background technique [0002] Fluidized bed drying technology is a new type of drying technology developed in recent years. The process is that the bulk material is placed on the orifice plate, and the gas is conveyed from the lower part, causing the material particles to move on the gas distribution plate, and in the air flow It is in a suspended state, producing a mixed bottom layer of material particles and gas, just like a liquid is boiling. In the fluidized bed dryer, the material particles are in full contact with the gas in the mixed bottom layer, and the heat transfer and moisture transfer between the material and the gas are carried out. At present, it is widely used in chemical industry, food, ceramics, medicine...

AI Technical Summary

Problems solved by technology

For the measurement of solid particle humidity and online measurement of concentration distribution in the fluidized bed drying process, the existing single-mode measurement methods cannot realize the coordinated measurement of these two key parameters, and the combination of multiple measurement methods still exists. Unresolved key technical issues

For a long time, ECT has made some progress in the measurement of particle concentration distribution of gas-solid two-phase flow in a gas-solid fluidized bed. and the accuracy of humidity measurement has not been effectively resolved

Microwave has high sensitivity to the change of trace moisture in materials. Microwave resonance technology shows its unique advantages in the measurement of particle humidity, but it cannot coordinate the measurement of humidity and concentration.

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