High pressure dust gas sampling and decompression method and apparatus

Abstract

The invention relates to a high pressure dust gas sampling decompression method and a device. The high pressure dust gas after condensation and drying is guided into a deceleration sampling pipe (2) by a primary sampling pipe (1), the pressure of the high pressure dust gas is reduced by the adiabatic expansion through an ostiole of the deceleration sampling pipe (2), and the temperature is also reduced to the lowest in a flash; the high pressure gas after decompression continuous to expand in a primary expansion chamber (3) and is decompressed; then the gas is guided into a second stage expansion chamber (7) by a primary sample-guiding pipe (6), the sampling speed of which is equal to the gas-stabilization speed in the primary expansion chamber (3), and the redundant gas in the primary expansion chamber (3) is discharged; after the primary sample-guiding pipe (6) takes out the needed sample gas from the primary expansion chamber (3) in an equal motion way, the gas flows into the second stage expansion chamber (7) through the ostiole at the tail end, and expansion and decompression are carried out again; afterwards, a second stage sampling pipe (10) takes out part of the gas in the equal motion way and guides the gas into a particle analyzer (11) to carry out detection analysis, and the redundant gas is discharged by a second stage discharge pipe (8) and a pressure regulating valve (9); the gas after the detection is discharged by a discharge pipe (12).

Description

technical field [0001] The invention relates to a high-pressure dust-containing gas sampling and decompression method and device for dust detection in high-pressure natural gas transmission pipelines. Involves areas of surveying and piping technology not covered by other classes. Background technique [0002] Since most particle analyzers (aerosol spectrometers) operate under normal pressure or not too high pressure (less than 1MPa), the pressure of some high-pressure dusty gases is generally higher, such as high-pressure natural gas pipelines The internal pressure can be as high as 10MPa. Obviously, it is impossible to directly use particle analyzers for detection and analysis. Therefore, in the on-line detection of high-pressure dust-laden gas, in order to realize the on-line detection of high-pressure dust-laden gas, it is necessary to decompress the high-pressure natural gas to meet the pressure requirements of the particle analyzer. [0003] According to experience, ...

AI Technical Summary

Problems solved by technology

However, when the particle size of the dust is greater than 1 μm, the particle loss near the small hole is quite serious, which affects the accuracy and authenticity of the detection structure

Moreover, in reality, the dust concentration in high-pressure dust-laden gas is generally relatively high, and most of the dust particle sizes are larger than 1 μm. Therefore, a new sampling and decompression device must be designed to meet the needs of high-pressure dust-laden detection.

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