Fluidized bed thermogravimetric analysis system for real-time accurate measurement of gas-solid reaction kinetics

Abstract

The invention provides a fluidized bed thermogravimetric analysis system for real-time accurate measurement of gas-solid reaction kinetics. The system comprises a gas path unit, a fluidized bed reactor unit and a data collection unit, wherein the gas path unit is used for realizing a gas inlet path and a gas outlet path of a gas-solid reaction, and a weight sensor is placed at the bottom of a fluidized bed for obtaining a mass change of the entire fluidized bed in the reaction process. The fluidized bed thermogravimetric analysis system provided by the invention firstly proposes a method for measuring the overall mass of a fluidized bed reactor by using the weight sensor so as to obtain the gas-solid reaction kinetics under a fluidized bed condition according to the mass change, and the feasibility of the method is proved by experimental verification. Compared with the conventional micro-fluidized bed, a real-time distortion-free weight signal is used as an original signal to avoid a measurement distortion phenomenon of the gas signal caused by gas mixed diffusion.

Description

technical field [0001] The present application relates to the field of precise measurement of gas-solid reaction kinetics, in particular to a fluidized bed thermogravimetric analysis system for real-time precise measurement of gas-solid reaction kinetics. Background technique [0002] There are a large number of gas-solid reactions in the fields of energy, chemical industry, environment and metallurgy, such as thermal decomposition of calcium carbonate / carbonation of calcium oxide, pyrolysis and gasification of coal, dry desulfurization process, ore reduction, etc. Accurate measurement of gas-solid reaction kinetics not only has important scientific significance and can explain natural laws, but also has important practical engineering significance, which can guide the design and optimization of reactors and the stable operation of industrial devices. For the measurement of gas-solid reaction kinetics, the current mainstream analysis methods are thermogravimetric analysis an...

AI Technical Summary

Problems solved by technology

However, the thermogravimetric analysis method also has obvious defects: in the thermogravimetric analysis method, the solid material is in a piled state, resulting in insufficient contact between the reaction gas and the solid, so the gas-solid reaction process is seriously disturbed by mass transfer.

There are defects in this method. There is back-mixing and axial diffusion of components in the gas in the fluidized bed, and there is also axial diffusion in the pipeline from the outlet of the fluidized bed to the inlet of the gas analyzer. Therefore, the final gas concentration obtained by the gas analyzer is The signal is a distorted signal, the true reaction kinetics of the gas-solid reaction is distorted by the disturbance of the above process

Images