Power plant boiler high-temperature pipe system macro displacement measurement device and method based on CCD photography

Abstract

A power plant boiler high-temperature pipe system macro displacement measurement device based on CCD photography comprises a fixing assembly (2), a cross-shaped LED lamp group (3), a CCD camera (4), a lightproof acquisition metal cover (5) and an image processor (6); the fixing assembly (2) is composed of an anchor ear, a support and a flat plate, the support is fixed to the anchor ear, the flat plate is fixed to the support, and the anchor ear is tightly hooped to a high-temperature pipe system to-be-measured pipe (1); LED lamps form a cross curve array, and then the cross curve array is fixed at a central position of the flat plate of the fixing assembly; the CCD camera (4) continuously acquires images formed by the lamp group (3); the lightproof acquisition metal cover (5) covers the LED lamps and the CCD camera; the image processor (6) is connected with the CCD camera through a signal cable and converts the images into a gray value matrix; a certain image matrix is compared with an image matrix recorded at an initial moment, and displacements of a cross curve in the front and rear image matrixes are calculated; and, through combination with magnification and horizontal and vertical interval conditions of CCD pixels, an actual displacement of the lamp group in the object space is calculated. A safety status of a steam pipe can be monitored and evaluated in real time and can be transmitted remotely.

Description

technical field [0001] The invention relates to a macroscopic displacement measuring device of a power plant boiler high-temperature pipe system based on CCD photography (Charge-coupled Device, charge-coupled photography). The invention also relates to a method for measuring the macroscopic displacement of the high-temperature pipe system of the power plant boiler based on the CCD photography by using the above-mentioned device. Background technique [0002] The creep deformation of steam pipes in power plant boilers and the macroscopic instability and displacement of steam pipes caused by the sloshing of supports and hangers are one of the important aspects affecting the safe operation of boilers. Real-time monitoring of high-temperature pipe displacement can reflect the stress and strain inside boiler steam pipes. With the increasingly sophisticated management of equipment safety in thermal power plants, the records of expansion data of high-temperature piping systems such...

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Problems solved by technology

[0003] The traditional steam pipeline displacement measurement method is mostly an expansion indicator, which needs to be implemented when the unit is out of operation. Safety monitoring relies on manual data collection and processing, which has a long cycle and poor synchronization. Especially when an emergency occurs in a power plant, data collection cannot be completed continuously in time. It is difficult to monitor and evaluate the safety status of the steam pipeline in a timely manner, and there is a serious lag in the compilation and analysis of safety monitoring data and the feedback of information; in addition, the expansion indicator is made of carbon steel, which is easy to corrode and rust after a period of time after installation, and it will be used for a long time Finally, the needle tip of the pointer caused scratches on the panel, causing the reading area to jam, and the read data was inaccurate; in addition, the measured data could not be transmitted remotely.

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