A powder flow pattern detection device in a spiral conveying pipe and a compression sensing flow pattern identification method

Abstract

The invention discloses a powder flow pattern detection device in a spiral conveying pipe and a compressive sensing flow pattern identification method. The detection device consists of a detection sensor, a signal acquisition and processing unit and a host computer. The detection sensor includes a helical front end shielding electrode array, a helical detecting electrode array, a helical end shielding electrode array, a cylindrical insulating pipe, and a shielding cover. The algorithm based on compressive sensing theory is used to identify the flow pattern, which overcomes the limitation of the traditional algorithm that needs to calculate the sensitivity matrix. The device and the method significantly improve the uniformity of the sensitive field of the detection sensor, the signal acquisition and processing circuit has a simple structure, the flow pattern identification algorithm has a small calculation amount, and can accurately and effectively identify the flow pattern, and solve the problem of filling powder in the spiral conveying pipe. The problem of fluid flow pattern identification has good application prospects and practical value.

Description

technical field [0001] The invention relates to an on-line detection device for powder in industrial production pipelines, specifically provides a powder flow pattern detection device in a spiral conveying pipe and a compression sensing flow pattern identification method, which belongs to the technical field of material conveying detection devices and can be applied to food, chemical industry, and agriculture and other industries. Background technique [0002] The spiral conveying pipeline has good controllability and stability for the transportation of powder and granular materials, and is widely used in the transportation, batching and packaging production process of industrial minerals, agricultural materials, chemicals, food processing raw materials and finished products. With the rapid development of these industries, the study of the flow mechanism of materials in the spiral conveying pipeline and the accurate detection of its various parameters are the basis for the r...

AI Technical Summary

Problems solved by technology

This type of method can measure the solid phase concentration of the two-phase flow, but due to the separation of the two fluids, the system is complicated, which may affect the continuity of the industrial process and limit its application range

The second category is based on ultrasonic technology, microwave technology, spectral technology, nuclear magnetic resonance technology, radiation technology, new tracer technology, related technology, capacitance method, process tomography and other new detection technologies, but many of these technologies are based on Phase flow measurement is still mostly in the experimental research stage or applied to special occasions, and there is still a long way to go before industrial production

However, due to the limited amount of information that can be obtained by ECT sensors, ECT image reconstruction is a process of solving an underdetermined ill-conditioned equation. Despite the efforts of domestic and foreign scholars for many years, the problem of ECT image reconstruction has not been well solved, and the obtained images are relatively poor. At the same time, due to the complex image reconstruction process, large amount of calculation, and poor real-time performance, the online application of ECT flow pattern recognition is limited.

[0007] Existing flow pattern identification algorithms, such as: In 2002, Peng Lihui and others introduced the principal component analysis method in the invention patent based on principal component analysis and neural network two-phase flow concentration measurement method (application number 02153486.1) after normalization Capacitance measurement value, avoiding the error caused by the traditional image reconstruction algorithm, but due to the limited number of output neurons, the imaging resolution is not high; The method and device (patent application number 200310108142.1) uses the back-projection algorithm to reconstruct the distribution image of the oil-gas two-phase flow medium, displays the flow pattern in the pipeline in real time, and uses fuzzy recognition for online automatic identification of the flow pattern. The discrimination accuracy is different; in 2010, Yang Daoye obtained the dielectric constant of the measured medium by adding a capacitive sampling sensor in the invention patent gas-solid two-phase flow online calibration capacitance tomography system and online calibration method (patent application number 201010146260.1), and the imaging system The hardware structure is complex and the measurement error is large

[0008] How to detect the powder flow pattern during the feeding process of the screw conveying pipeline has always been an industrial problem. Body movement is very complex

How to use the above technology to accurately and reliably detect the flow pattern of powder in the spiral conveying pipeline is a topic that needs further research. At present, there are no relevant reports on the detection of material flow pattern in the spiral conveying pipeline.

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