Online calculation method for stacking density of coal on belt conveyor

Abstract

The invention discloses an on-line calculation method for the stacking density of coal on a belt conveyor, which is characterized in that a camera is arranged right above a rubber belt of the belt conveyor to collect a coal stacking surface image, and the image is transmitted to a computer for image processing to obtain the stacking density of the coal. The method comprises the following specific steps: firstly, performing morphological processing on a coal accumulation surface image according to open operation; secondly, carrying out OTSU image binary segmentation processing on the coal accumulation surface image after open operation processing; then, calculating the circularity and rectangularity of all connected regions of the coal accumulation surface binary image; and finally, carrying out on-line calculation of the coal stacking density according to the coal stacking density two-dimensional model provided by the invention. The method is characterized in that the method for measuring the stacking density of the coal on the belt conveyor through vision belongs to non-contact online measurement, and the stacking density of the coal can be conveniently and rapidly obtained by using the method; the method has important significance for guiding the setting of the rotating speed of the belt conveyor rubber belt in a coal-fired thermal power plant to save energy and the feeding amount of a coal feeder to achieve regulation and control of a coal-fired thermal power generation process.

Description

technical field [0001] The invention belongs to the field of coal-fired thermal power generation technology and intelligent visual measurement, and in particular relates to an online calculation method for coal stock density on a belt conveyor. Background technique [0002] Many engineering fields need to study the packing density of particles, which has always been concerned by many scholars in mathematics, mineralogy and other industries. The study of particle packing density is of great significance in theory and practice. [0003] With the common development of various technologies such as artificial intelligence, image processing, machinery and electronics, coal-fired thermal power plants use laser scanners and CCD cameras to obtain the quality of coal carried by the belt conveyor to adjust the belt speed of the belt conveyor and adjust The amount of coal fed to the coal mill can maximize the optimization of the coal-fired thermal power generation process. [0004] Las...

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Problems solved by technology

Affected by the non-uniform distribution of particle gaps inside the coal material accumulation, it is difficult to calculate the actual coal material accumulation density, resulting in large errors in the calculation of coal material quality

Aiming at the problem that the non-uniform distribution of particle gaps inside the coal accumulation leads to large errors in the calculation of coal mass, many scholars actively explore the calculation method of coal accumulation density

[0005] Patent Publication No. CN107424143B discloses a mine belt conveyor coal volume detection method based on binocular vision depth perception. This method uses T-S fuzzy reasoning algorithm to estimate the approximate density of coal accumulation, and requires prior knowledge of coal block area and perimeter. , the method is complex and cannot meet the engineering application requirements of coal-fired thermal power plants; Zhang Shaobin et al. introduced a method to analyze the accumulation model of coal particles using the discrete element method, and use the maximum inscribed sphere optimization method to reconstruct the irregular shape. In order to calculate the porosity of the simulated coal particle accumulation model (Zhang Shaobin. Research on Intelligent Control of Belt Conveyor Based on Live Load [D]. Coal Research Institute, 2019.), and then calculate the coal accumulation density, this method requires The modeling and analysis of coal particle accumulation is cumbersome and cannot meet the needs of engineering applications

[0006] When studying the coal bulk density calculation method mentioned above, the stability, accuracy, and rapidity requirements of actual engineering applications were not considered, and it could not meet the requirements of the coal bulk density calculation task on the belt conveyor in the coal-fired thermal power plant.

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