Method for identifying pressure fluctuation signal caused by bubbles in gas-solid fluidized bed

Abstract

The invention discloses a method for identifying a pressure fluctuation signal caused by bubbles in a gas-solid fluidized bed. The method comprises the following steps: acquiring a reference pressure signal and a contrast pressure signal in a fluidized state of a bed layer of the fluidized bed; respectively calculating a cross correlation coefficient between each single-layer pressure signal of the contrast pressure signal and each single-layer pressure signal of the reference pressure signal; determining a significant single-layer pressure signal related to the bubble movement according to the size of the cross correlation coefficient, performing contrast pressure signal reconstruction, and determining a contrast pressure signal caused by the bubble movement; and calculating the bubble size and the bubble movement speed by using the reconstructed contrast pressure signal. The method provides a thought for accurately analyzing the bubble movement behavior in the gas-solid fluidized bed, can reduce the misjudgment of the pressure signal caused by the bubbles, and improves the accuracy of bubble feature recognition in the bed layer.

Description

technical field [0001] The invention relates to the technical field of bubble pressure signal identification, in particular to a method for identifying pressure fluctuation signals caused by bubbles in a gas-solid fluidized bed. Background technique [0002] The air-dense medium fluidized bed is a typical gas-solid two-phase flow system, and its most basic feature is the coexistence of the emulsified phase of particle aggregation and the bubble phase of gas aggregation, and the two are in a dynamic process. In the air-dense medium fluidized bed, the existence of the motion behavior of bubbles leads to polymorphic and nonlinear characteristics of the phase-to-phase motion behavior of the fluidized bed. The motion behavior of air bubbles not only affects the uniform mixing of heavy particles, but also interferes with the segregation behavior of coal particles according to density in the vibrating fluidized bed. Therefore, in order to control the bed density distribution in re...

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Problems solved by technology

[0003] In order to solve the problem of inaccurate evaluation results of bubble movement behavior, the present invention proposes a method for identifying pressure fluctuation signals caused by bubbles in a gas-solid fluidized bed

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