Paper Detection Key Equipment To Fill The Gaps - China Multiservice Multiplexer - Interface

Recently, the Special Equipment Inspection Institute

, Hangzhou, Zhejiang Province, the concrete implementation of "safety in the dryer with cast iron detection and assessment of" research by the National Special Equipment Inspection and Research Institute, Zhejiang University and other famous experts, scholars, after the identification of group identification, agreed that the inspection and testing technology has broad prospects, filled the blank of cast iron pressure vessel inspection, the leading domestic level.

It is understood that the paper industry is a pillar of Hangzhou Fuyang area industries, and 365 paper-making enterprises. Paper 2006, Fuyang scale enterprises 14.899 billion yuan output value, accounting for the city's total industrial output value scale of 1 / 3 more than the actual paper output in Zhejiang Province, 1 / 2, accounting for about paper production 1 / 15.

The cast iron is the paper-making equipment, paper making dryer the most critical components, a number of paper-making production line requires different dryer, small, paper-making production line requires only a few sets dryer, a large production line needs more than ten or even 50 more than . According to census quality and technical supervision of Hangzhou, Fuyang City, there are currently only 4475 units dryer, iron dryer the nation's most concentrated areas. But these are mostly in the dryer with cast iron paper to use old equipment longer periods of time, even when the enterprise is the purchase of used equipment, prolonged use, it fails to state the relevant provisions for regular inspection, there are great risks. As a local pillar industry, paper companies can not afford to test for a long shutdown caused by the loss. So, over the years drifted away from Fuyang paper dryer outside the scope of special equipment safety supervision, although the Quality and Technical Supervision, Hangzhou, has tried all possible ways, still with little success.

Meanwhile, the cast iron dryer test paper there are many technical difficulties. As the cast iron dryer cylinder wall thickness, heat capacity, thermal performance, wear resistance, and therefore widely used in papermaking dryer is gray cast iron. As the gray cast iron are brittle materials, material properties than the brittle, cast iron casting process prone to casting defects, and internal organization than the steel casting loose, coarse grains, there are a lot of flake graphite, so a lot of steel detection are ineffective, the current international and domestic is no effective means of simple tests. As detection technology constraints, the existing detection technology can not detect internal defects in cast iron dryer. Therefore, the current macro detected mainly based detection difficult to implement a comprehensive inspection.

In order to solve this troubled safety problems for many years in Hangzhou, Hangzhou Special Equipment Inspection Institute launched the "safety in the dryer with cast iron detection and evaluation" in the research. Around the "find out the real, and establish a system to eliminate hidden dangers and long-term management" objectives, extensive scientific evidence, in a large number of experiments based on the development of a "cast iron used in the paper machine dryer with periodic inspection program," and by test 2 years practical experience, demonstrate the success of the program.

"In the dryer with cast iron security detection and assessment" study to obtain a double crystal probe based on longitudinal wave ultrasonic testing method of cast iron dryer. It is based on the volume-type defects and planar defects were using small-angle and wide-angle double crystal probe, solved the difficult problem of ultrasonic testing of cast iron dryer. At the same time, also made with small cracks on the area cast iron dryer shaped defect approach, with the depth of 2mm on the following crack-shaped defects in the area of safety assessment, the results show that safe to use, periodic inspection program for the cast iron dryer NDT provided the basis for defect treatment. In addition, the study also produced a cast iron dryer periodic inspection program is not open manholes in the case of a regular dryer also can be tested.

Experts said the research has greatly enhanced the quality inspection of cast iron dryer, iron dryer to effectively prevent security incidents occur, to ensure the safe production of enterprises of great social significance.

by: gaga

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