A three-dimensional bubble recognition method in gas-solid bubbling bed based on distance constraint algorithm

Abstract

The invention discloses a distance constraint algorithm-based three-dimensional bubble identification method in a gas-solid bubbling bed, which comprises the following steps of: 1) obtaining point coordinates in the gas-solid bubbling bed at a certain moment and solid content rates corresponding to the point coordinates to form a data total set with a scale of n; 2) screening out a bubble data point set from the total data set obtained in the step 1); 3) calculating the Euclidean distance between every two bubble data points in the bubble data point set to obtain a total Euclidean distance matrix; 4) defining a minimum search neighborhood delta; 5) carrying out row and column search in a neighborhood, and respectively storing row and column search results in a row set Srow and a column setScol; taking a previous round of search result as a starting point position of a next round of search, and repeatedly carrying out row and column search in a neighborhood; completing the recognitionof a single bubble until SrowScool=phi; 6) marking the identified bubbles, and 7) repeating the steps 5)-6) until all elements in the total Euclidean distance matrix are traversed to complete the identification process of the bubbles in the whole gas-solid bubbling bed.

Description

technical field [0001] The invention relates to a method for identifying three-dimensional bubbles in a gas-solid bubbling bed based on a distance constraint algorithm, which belongs to the field of chemical industry. Background technique [0002] Studies have shown that the characteristics of bubbles are important parameters in gas-solid bubbling beds. Bubbles change the flow state of the gas itself through the particle bed, and at the same time induce specific motion patterns of surrounding particles. In the gas-solid bubbling bed, the existence of bubbles causes the rapid and sufficient mixing of the materials in the bed, and at the same time enhances the contact efficiency between gas and solid, providing good mass and heat transfer conditions. [0003] The structure, size, velocity and other parameters of the bubbles in the gas-solid bubbling bed, as well as the shape changes of the bubbles (such as formation, coalescence, splitting, etc.) all affect the particle mixing...

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Problems solved by technology

However, the defects of these methods are also obvious, that is, it is impossible to carry out quantitative analysis for an actual working condition, and neither the data obtained by the probe nor the image method can effectively deal with the complex overlapping phenomenon of bubbles in the actual working condition

The main idea for the simulation system is to first generate a two-dimensional slice, and then obtain the bubble boundary based on image recognition binarization and other methods. The data obtained by this method is one-sided and random, and the two-dimensional section of the bubble cannot accurately reflect the entire three-dimensional space. Number, size features in

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