Current situation and development trend of gas leakage detection technology

3, methane detection lamp method

This test is mainly based on the length of the methane burning flame to measure. The advantage is that the methane volume fraction can be measured in the absence of oxygen, and the structure of this type of instrument is relatively simple. However, the error is large and the measurement results are not accurate enough. Can not measure the high volume fraction of methane, and its safety performance is not very good, the staff in the specific operation process a little careless Ozhe improper operation will cause an explosion, which can be seen that its safety performance is more worrying.

4, density difference methane measurement method

This method uses the change in the angular velocity of the rotor resulting from the density difference between methane and air (in this paper, the Angle at which methane gas is swept by the radius of rotation per second) to measure the methane volume fraction. This method has the advantages of simple structure and firmness. High safety performance, but its volume is too large, not easy to place and slack, at the same time, its detection accuracy error is also its more obvious shortcomings.

5, thermal conductivity measurement method

The principle of this method is to determine the methane volume fraction by using the change of the relative air thermal conductivity caused by the change of methane volume fraction. However, this method has low accuracy when detecting methane with low volume fraction, and is more susceptible to the influence of gas purity when detecting.

Second, development trend

Using intelligent detection to visually display whether there is leakage in the pipe segment is the focus of global technical research. Through ultrasonic technology using frequency detector detection, can quickly meet the requirements. The use of magnetic flux leakage technology is more difficult to achieve than ultrasonic technology, which is determined by the principle of magnetic flux leakage detection technology.

Optical fiber absorption method and optical interference method are generally used in large natural gas storage devices to detect whether there is leakage due to the instability of the external environment, and the future development prospects of magnetic flux leakage detector mainly have two aspects: first, the probe in the probe to control the accuracy of the probe and the number of probes, in order to ensure the accuracy of the data collection.

The second is to improve the level of automation based on accurate analysis with data, which can paint a picture of the true condition of the pipeline. One of the most important is the need to make continuous efforts in the study of the mathematical model of the corresponding relationship between magnetic leakage and defects.

Iii. Summary

The timely development and application of natural gas leakage detection play an important role in the safe use of natural gas in our country. Among the methane detection technologies, due to the influence of the external environment, it has a very large instability, and its main means are relatively simple. With the use of intelligent detectors, especially the rapid development of internal detection technology, the construction and use in China have been widely used.