Abstract
In gas-solid two-phase flow, the situation that the moisture in the solid changes is often encountered. The varying and unknown moisture brings new challenges to the solid concentration measurement if the used measurement method is sensitive to the moisture. In this study, a new method which can eliminate the influence of moisture on the measurement of solid concentration in gas-solid flows is proposed. Firstly, the new combined sensors consisting of the microwave transmission sensor and the capacitance sensor are proposed and the measurement systems are designed. The microwave transmission sensor and the capacitance sensor are both sensitive to the moisture and the solid concentration, and they can acquire the information of the solid concentration and the moisture simultaneously. Then an effective decoupling method is proposed to derive the moisture and the solid concentration from the information acquired by the microwave transmission sensor and the capacitance sensor. Experiments are carried out to simulate the flow structure of roping flow to verify the proposed method. The results indicate that the influence of moisture on the measurement of solid concentration can be eliminated, and moisture independent measurement of solid concentration in gas-solid flows can be realized.
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