Inner powder dust on-line checking method for high pressure gas pipeline and its device

Abstract

The invention relates to an online detection method of dust in a high pressure natural gas pipeline and a device thereof, and the method comprises the steps that: a static pressure balanced sampling nozzle (2) is inserted into a pipeline (1) from a pipeline joint pipe (5), flow is regulated to achieve sampling in an equal motion way; the gas in an inner chamber and an outer chamber is divided into two parts by the sampling nozzle (2), which are respectively transferred to a differential pressure sensor (11) for detection, when the display result of the differential pressure sensor (11) is zero or within the precision range, the natural gas collected in the equal motion way is condensed and dried, the instantaneous flow and the accumulated flow of the gas are recorded, and the pressure and the temperature at the time are tested; then, the natural gas is reduced to be one atmospheric pressure by decompression, the gas needed by a particle analyzer (24) is taken out in the equal motion way, the pressure and the temperature at the time are tested, and the redundant gas is discharged; the natural gas after the detection by the particle analyzer (24) is discharged; dust concentration C0 in the natural gas pipeline is calculated by the parameters of the pressure, the temperature and the flow before and after the decompression according to the dust concentration C1 detected by the particle analyzer (24).

Description

technical field [0001] The invention relates to an online dust detection method and device for high-pressure gas, especially dust concentration and particle size distribution in high-pressure natural gas pipelines. Involves areas of surveying and piping technology not covered by other classes. Background technique [0002] At present, the filter weighing method is generally used for dust detection in natural gas. The principle is: using the principle of isokinetic sampling (sampling speed is equal to the speed in the gas transmission pipeline), a part of the gas is taken from the natural gas pipeline with the help of different types of sampling nozzles. Perform detection and analysis to determine the dust concentration and particle size distribution in natural gas. The detection system generally consists of the following four parts: (1) sampling nozzle and sampling tube, used to take a part of the sample gas from natural gas; (2) dust collection (3) Condensation and drying ...

AI Technical Summary

Problems solved by technology

[0005] (2) The dust concentration of natural gas is low (as low as 0.01mg / Nm3), while the dust concentration in existing research (such as flue gas) is relatively high;

[0006] (3) The dust particle size in natural gas is small, but the dust particle size in the detection of dusty gas in the existing research is larger than that in natural gas;

[0007] (4) General particle analyzers operate under normal pressure or below 1MPa, so to detect the dust of high-pressure gas, the high-pressure gas must be decompressed

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