In-service air cooler tube bundle detection method based on X-ray digital imaging technology

Abstract

Disclosed is an in-service air cooler tube bundle detection method based on an X-ray digital imaging technology; the detection method comprises the following steps that a detection object is determined, and detection equipment and tools are prepared; an X-ray machine and a flat-plate detector are fixed on the corresponding tools, and the tools are arranged on the detected air cooler; and the corresponding detection parameters of the X-ray machine are selected and the tools are adjusted to ensure that the requirement of the detection focal length is met; the sensitivity of the detection systemis determined by using an image quality meter; the effective detection area of each time of detection, the number of the tube bundles of the air cooler, and the simultaneous stepping lengths of the X-ray machine and the flat panel detector are determined, and then detection is carried out; whether the defect exists in the tube bundle of the detected air cooler or not is judged according to a digital imaging result on a displayer; after the suspected defect is positioned, defect quantification is carried out, and whether the tube bundle of the air cooler has an exceed standard defect or not isjudged according to the positioning and quantification of the defect. According to the method, the corrosion condition of the tube bundle of the air cooler can be quickly and effectively known, and the influence of the overlap of the outer fins and the multiple rows of tube bundles on the detection can be effectively avoided.

Description

technical field [0001] The invention relates to a detection method for an in-service air cooler tube bundle. In particular, it relates to a detection method for tube bundles of in-service air coolers based on X-ray digital imaging technology. Background technique [0002] Air cooler is an important heat exchange equipment in refining and chemical plants. With the rapid development of my country's petrochemical industry in recent years, the use of air coolers has increased dramatically. With the increase of domestic processing of high-sulfur, high-acid, chlorine-containing and other low-quality oils, the corrosion problem of petrochemical equipment is becoming more and more serious, and the corrosion of air coolers is also becoming more and more serious, especially oil-gas air coolers and acidic water air coolers in upstream devices of petroleum processing. Corrosion failures of equipment are becoming more and more frequent, and the unplanned shutdowns and maintenance caused...

AI Technical Summary

Problems solved by technology

Due to the fin structure on the outer surface of the finned tube, the finned structure outside the finned tube will affect the detection, thereby affecting the detection sensitivity

At present, the methods that can effectively detect finned tubes are relatively limited. Due to the influence of fins, many detection technologies detect finned tubes from the inside, and most external detection methods cannot effectively detect them.

Commonly used detection methods have their obvious limitations, including high requirements for detection conditions, extremely low detection efficiency, low detection sensitivity and precision, etc., and often fail to achieve the expected detection effect

In addition, the tube bundles of the air cooler are distributed in a triangular row, the distance between the tube bundles is small, and the overlap is serious. The external inspection cannot effectively detect the tube bundles located inside the row, and the overlap of the tube bundles has an impact on the detection. It is difficult to detect the overall tube bundle of the air cooler.

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