Method and device for detecting leakage of shell type heat exchanger

Abstract

The invention relates to a detection method and a device thereof, in particular to a leak detection method for a shell-and-tube heat exchanger and a device thereof. The detection device comprises a helium mass spectrometer leak detector and a vacuum pump, and is characterized in that an air inlet tube is arranged on an air intake hood which is hermetically connected with one end of the shell-and-tube heat exchanger, an exhaust hood is hermetically arranged on the other end of the shell-and-tube heat exchanger and is equipped with an exhaust tube on the exhaust hood, a vacuum pump clearance tube is arranged on the outer shell of the shell-and-tube heat exchanger, and an air inlet of the helium mass spectrometer leak detector is communicated with the outlet of the vacuum pump. The detection device can lock the leak situations of all the detected shells and tubes in the air intake hood and the exhaust hood which are respectively arranged on the shell-and-tube heat exchanger at one time, and can accurately determine the leaking shells and tubes by replacing hoods of different specifications, thus greatly enhancing the detection efficiency and lightening the labor intensity. Meanwhile, the helium mass spectrometer leak detector is used, thus enhancing the detection precision of the device and eliminates the external interference.

Description

technical field [0001] The invention relates to a detection method and a device, in particular to a leakage detection method and a detection device of a shell-and-tube heat exchanger. Background technique [0002] The structure of the shell and tube heat exchanger is mainly composed of the shell, the sealing plates at both ends of the shell and the tubes installed in the shell, and the outer circular surfaces of the two ends of the tubes are sealed and connected with the sealing plate. One kind of medium is passed into the tubes, and another medium is passed into the cavity formed between the shell and the tubes, and the work is carried out through heat exchange between the two media. If the tubes leak during use, production will be affected. At present, the main methods for detecting tube leakage are candle method and compressed air method. The fire-candle method is to seal one end of the tube, put compressed air or vacuum into the casing, and then use the candle flame to...

AI Technical Summary

Problems solved by technology

Although the compressed air method overcomes external interference, the rubber stopper used for sealing needs to withstand high compressed air pressure, and its tightness is questionable, which will affect the test results, and when there is a small leak in the tube, It cannot be detected, and at the same time, this detection is also a must for every tube, and there is also a problem of high labor intensity

[0003] At present, the commonly used helium mass spectrometry leak detection method is mainly used in the leak detection of the vacuum system of the steam turbine, and it cannot be used for the leak detection of the shell and tube heat exchanger due to structural problems.

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